"""
Stage 2 LLM Agents — Specialized Analysis Tasks
=================================================

These agents handle tasks that REQUIRE LLM reasoning:
- Brand Identifier: Identify brand colors from usage context
- Benchmark Advisor: Recommend best-fit design system
- Best Practices Validator: Prioritize fixes by business impact
- HEAD Synthesizer: Combine all outputs into final recommendations

Each agent has a focused prompt for its specific task.
"""

import json
import re
from dataclasses import dataclass, field
from typing import Optional, Callable, Any
from datetime import datetime


# =============================================================================
# DATA CLASSES
# =============================================================================

@dataclass
class BrandIdentification:
    """Results from Brand Identifier agent (AURORA)."""
    brand_primary: dict = field(default_factory=dict)
    # {color, confidence, reasoning, usage_count}

    brand_secondary: dict = field(default_factory=dict)
    brand_accent: dict = field(default_factory=dict)

    palette_strategy: str = ""  # complementary, analogous, triadic, monochromatic, random
    cohesion_score: int = 5  # 1-10
    cohesion_notes: str = ""

    semantic_names: dict = field(default_factory=dict)
    # {hex_color: suggested_name}

    self_evaluation: dict = field(default_factory=dict)
    # {confidence: 1-10, reasoning: str, data_quality: good|fair|poor, flags: []}

    def to_dict(self) -> dict:
        return {
            "brand_primary": self.brand_primary,
            "brand_secondary": self.brand_secondary,
            "brand_accent": self.brand_accent,
            "palette_strategy": self.palette_strategy,
            "cohesion_score": self.cohesion_score,
            "cohesion_notes": self.cohesion_notes,
            "semantic_names": self.semantic_names,
            "self_evaluation": self.self_evaluation,
        }


@dataclass
class BenchmarkAdvice:
    """Results from Benchmark Advisor agent."""
    recommended_benchmark: str = ""
    recommended_benchmark_name: str = ""
    reasoning: str = ""
    
    alignment_changes: list = field(default_factory=list)
    # [{change, from, to, effort}]
    
    pros_of_alignment: list = field(default_factory=list)
    cons_of_alignment: list = field(default_factory=list)
    
    alternative_benchmarks: list = field(default_factory=list)
    # [{name, reason}]

    self_evaluation: dict = field(default_factory=dict)
    # {confidence: 1-10, reasoning: str, data_quality: good|fair|poor, flags: []}

    def to_dict(self) -> dict:
        return {
            "recommended_benchmark": self.recommended_benchmark,
            "recommended_benchmark_name": self.recommended_benchmark_name,
            "reasoning": self.reasoning,
            "alignment_changes": self.alignment_changes,
            "pros": self.pros_of_alignment,
            "cons": self.cons_of_alignment,
            "alternatives": self.alternative_benchmarks,
            "self_evaluation": self.self_evaluation,
        }


@dataclass
class BestPracticesResult:
    """Results from Best Practices Validator agent."""
    overall_score: int = 50  # 0-100
    
    checks: dict = field(default_factory=dict)
    # {check_name: {status: pass/warn/fail, note: str}}
    
    priority_fixes: list = field(default_factory=list)
    # [{rank, issue, impact, effort, action}]
    
    passing_practices: list = field(default_factory=list)
    failing_practices: list = field(default_factory=list)

    self_evaluation: dict = field(default_factory=dict)
    # {confidence: 1-10, reasoning: str, data_quality: good|fair|poor, flags: []}

    def to_dict(self) -> dict:
        return {
            "overall_score": self.overall_score,
            "checks": self.checks,
            "priority_fixes": self.priority_fixes,
            "passing": self.passing_practices,
            "failing": self.failing_practices,
            "self_evaluation": self.self_evaluation,
        }


@dataclass
class HeadSynthesis:
    """Final synthesized output from HEAD agent."""
    executive_summary: str = ""
    
    scores: dict = field(default_factory=dict)
    # {overall, accessibility, consistency, organization}
    
    benchmark_fit: dict = field(default_factory=dict)
    # {closest, similarity, recommendation}
    
    brand_analysis: dict = field(default_factory=dict)
    # {primary, secondary, cohesion}
    
    top_3_actions: list = field(default_factory=list)
    # [{action, impact, effort, details}]
    
    color_recommendations: list = field(default_factory=list)
    # [{role, current, suggested, reason, accept}]
    
    type_scale_recommendation: dict = field(default_factory=dict)
    spacing_recommendation: dict = field(default_factory=dict)

    self_evaluation: dict = field(default_factory=dict)
    # {confidence: 1-10, reasoning: str, data_quality: good|fair|poor, flags: []}

    def to_dict(self) -> dict:
        return {
            "executive_summary": self.executive_summary,
            "scores": self.scores,
            "benchmark_fit": self.benchmark_fit,
            "brand_analysis": self.brand_analysis,
            "top_3_actions": self.top_3_actions,
            "color_recommendations": self.color_recommendations,
            "type_scale_recommendation": self.type_scale_recommendation,
            "spacing_recommendation": self.spacing_recommendation,
            "self_evaluation": self.self_evaluation,
        }


# =============================================================================
# BRAND IDENTIFIER AGENT
# =============================================================================

class BrandIdentifierAgent:
    """
    AURORA — Senior Brand Color Analyst.

    Identifies brand colors from usage context using creative/visual reasoning.
    Model: Qwen 72B (strong creative reasoning, color harmony assessment)
    Temperature: 0.4 (allows creative interpretation of color stories)

    WHY LLM: Requires understanding context (33 buttons = likely brand primary),
    not just color math.
    """

    SYSTEM_PROMPT = """You are AURORA, a Senior Brand Color Analyst specializing in visual identity systems.

## YOUR ROLE IN THE PIPELINE
You are Agent 1 of 4 in the Design System Analysis pipeline.
- INPUT: Raw color tokens with usage counts + semantic CSS analysis from Stage 1 extraction
- OUTPUT: Brand color identification + palette strategy → feeds into NEXUS (Agent 4) for final synthesis
- Your analysis directly influences the final color recommendations shown to the user.

## YOUR EXPERTISE
- Color harmony theory (complementary, analogous, triadic, split-complementary, monochromatic)
- Brand identity systems (primary/secondary/accent hierarchy)
- CSS context interpretation (button colors = likely CTA, background colors = likely neutral)
- Color naming conventions (design token naming: brand.primary, text.secondary, etc.)

## QUALITY STANDARDS
- Brand Primary MUST have HIGH confidence if one color dominates buttons/CTAs. Say "low" if ambiguous.
- Cohesion Score: Use the FULL 1-10 range. A score of 7+ means clear intentional harmony. Most sites score 5-7.
- If fewer than 5 unique colors exist, flag as "insufficient_data" — don't guess relationships.

## WHAT NOT TO DO
- Don't inflate confidence. "Medium" is fine when usage patterns are unclear.
- Don't guess accent colors if none exist — use null.
- Don't assume complementary strategy just because two colors differ — check the actual hue relationship.
- Don't name colors generically. Use semantic design-token style names (brand.primary, not "blue").

## SCORING RUBRIC (Cohesion 1-10):
- 9-10: Clear harmony rule across all colors, distinct brand identity, consistent palette
- 7-8: Mostly harmonious, clear brand identity, minor inconsistencies
- 5-6: Some color relationships visible but not systematic
- 3-4: Random-feeling palette, no clear color strategy
- 1-2: Actively conflicting colors, no brand identity visible"""

    PROMPT_TEMPLATE = """Analyze the following color usage data and identify the brand color system.

## COLOR DATA WITH USAGE CONTEXT

{color_data}

## SEMANTIC ANALYSIS (from CSS properties)

{semantic_analysis}

## YOUR TASK

1. **Identify Brand Colors**:
   - Brand Primary: The main action/CTA color (highest visibility in buttons, links, key UI)
   - Brand Secondary: Supporting brand color (headers, secondary actions)
   - Brand Accent: Highlight color for emphasis (badges, alerts, special states)

2. **Assess Palette Strategy**: complementary, analogous, triadic, monochromatic, or random?

3. **Rate Cohesion** (1-10) using the rubric above

4. **Suggest Semantic Names** for top 10 most-used colors (design-token format)

5. **Self-Evaluate** your analysis quality

## OUTPUT FORMAT (JSON only)

{{
  "brand_primary": {{
    "color": "#hex",
    "confidence": "high|medium|low",
    "reasoning": "Why this is brand primary — cite specific usage evidence",
    "usage_count": <number>
  }},
  "brand_secondary": {{
    "color": "#hex",
    "confidence": "high|medium|low",
    "reasoning": "..."
  }},
  "brand_accent": {{
    "color": "#hex or null",
    "confidence": "...",
    "reasoning": "..."
  }},
  "palette_strategy": "complementary|analogous|triadic|monochromatic|random",
  "cohesion_score": <1-10>,
  "cohesion_notes": "Assessment of how well colors work together",
  "semantic_names": {{
    "#hex1": "brand.primary",
    "#hex2": "text.primary",
    "#hex3": "background.primary"
  }},
  "self_evaluation": {{
    "confidence": <1-10>,
    "reasoning": "Why I am this confident in my analysis",
    "data_quality": "good|fair|poor",
    "flags": []
  }}
}}

Return ONLY valid JSON."""

    def __init__(self, hf_client):
        self.hf_client = hf_client
    
    async def analyze(
        self,
        color_tokens: dict,
        semantic_analysis: dict,
        log_callback: Callable = None,
    ) -> BrandIdentification:
        """
        Identify brand colors from usage context.
        
        Args:
            color_tokens: Dict of color tokens with usage data
            semantic_analysis: Semantic categorization from Stage 1
            log_callback: Progress logging function
            
        Returns:
            BrandIdentification with identified colors
        """
        def log(msg: str):
            if log_callback:
                log_callback(msg)
        
        log("   🎨 AURORA — Brand Identifier (Qwen 72B)")
        log("   └─ Analyzing color context and usage patterns...")
        
        # Format color data
        color_data = self._format_color_data(color_tokens)
        semantic_str = self._format_semantic_analysis(semantic_analysis)
        
        prompt = self.PROMPT_TEMPLATE.format(
            color_data=color_data,
            semantic_analysis=semantic_str,
        )
        
        try:
            start_time = datetime.now()
            
            response = await self.hf_client.complete_async(
                agent_name="brand_identifier",
                system_prompt=self.SYSTEM_PROMPT,
                user_message=prompt,
                max_tokens=1000,
                json_mode=True,
            )
            
            duration = (datetime.now() - start_time).total_seconds()
            
            # Parse response
            result = self._parse_response(response)
            
            log(f"   ────────────────────────────────────────────────")
            log(f"   🎨 AURORA — Brand Identifier: COMPLETE ({duration:.1f}s)")
            log(f"   ├─ Brand Primary: {result.brand_primary.get('color', '?')} ({result.brand_primary.get('confidence', '?')} confidence)")
            log(f"   ├─ Brand Secondary: {result.brand_secondary.get('color', '?')}")
            log(f"   ├─ Palette Strategy: {result.palette_strategy}")
            log(f"   ├─ Cohesion Score: {result.cohesion_score}/10")
            se = result.self_evaluation
            if se:
                log(f"   └─ Self-Eval: confidence={se.get('confidence', '?')}/10, data={se.get('data_quality', '?')}")
            
            return result
            
        except Exception as e:
            error_msg = str(e)
            # Always log full error for diagnosis
            log(f"   ⚠️ Brand Identifier failed: {error_msg[:120]}")
            if "gated" in error_msg.lower() or "access" in error_msg.lower():
                log(f"   └─ Model may require license acceptance at huggingface.co")
            elif "Rate limit" in error_msg or "429" in error_msg:
                log(f"   └─ HF free tier rate limit — wait or upgrade to Pro")
            return BrandIdentification()
    
    def _format_color_data(self, color_tokens: dict) -> str:
        """Format color tokens for prompt."""
        lines = []
        for name, token in list(color_tokens.items())[:30]:
            if isinstance(token, dict):
                hex_val = token.get("value", token.get("hex", ""))
                usage = token.get("usage_count", token.get("count", 1))
                context = token.get("context", token.get("css_property", ""))
            else:
                hex_val = getattr(token, "value", "")
                usage = getattr(token, "usage_count", 1)
                context = getattr(token, "context", "")
            
            if hex_val:
                lines.append(f"- {hex_val}: used {usage}x, context: {context or 'unknown'}")
        
        return "\n".join(lines) if lines else "No color data available"
    
    def _format_semantic_analysis(self, semantic: dict) -> str:
        """Format semantic analysis for prompt."""
        if not semantic:
            return "No semantic analysis available"

        lines = []
        try:
            for category, value in semantic.items():
                if not value:
                    continue

                if isinstance(value, list):
                    # List of colors
                    color_list = []
                    for c in value[:5]:
                        if isinstance(c, dict):
                            color_list.append(c.get("hex", c.get("value", str(c))))
                        else:
                            color_list.append(str(c))
                    lines.append(f"- {category}: {', '.join(color_list)}")

                elif isinstance(value, dict):
                    # Could be a nested dict of sub-roles → color dicts
                    # e.g. {"primary": {"hex": "#007bff", ...}, "secondary": {...}}
                    # or a flat color dict {"hex": "#...", "confidence": "..."}
                    # or a summary dict {"total_colors_analyzed": 50, ...}
                    if "hex" in value:
                        # Flat color dict
                        lines.append(f"- {category}: {value['hex']}")
                    else:
                        # Nested dict — iterate sub-roles
                        sub_items = []
                        for sub_role, sub_val in list(value.items())[:5]:
                            if isinstance(sub_val, dict) and "hex" in sub_val:
                                sub_items.append(f"{sub_role}={sub_val['hex']}")
                            elif isinstance(sub_val, (str, int, float, bool)):
                                sub_items.append(f"{sub_role}={sub_val}")
                        if sub_items:
                            lines.append(f"- {category}: {', '.join(sub_items)}")
                else:
                    lines.append(f"- {category}: {value}")
        except Exception as e:
            return f"Error formatting semantic analysis: {str(e)[:50]}"

        return "\n".join(lines) if lines else "No semantic analysis available"
    
    def _parse_response(self, response: str) -> BrandIdentification:
        """Parse LLM response into BrandIdentification."""
        try:
            json_match = re.search(r'\{[\s\S]*\}', response)
            if json_match:
                data = json.loads(json_match.group())
                return BrandIdentification(
                    brand_primary=data.get("brand_primary", {}),
                    brand_secondary=data.get("brand_secondary", {}),
                    brand_accent=data.get("brand_accent", {}),
                    palette_strategy=data.get("palette_strategy", "unknown"),
                    cohesion_score=data.get("cohesion_score", 5),
                    cohesion_notes=data.get("cohesion_notes", ""),
                    semantic_names=data.get("semantic_names", {}),
                    self_evaluation=data.get("self_evaluation", {}),
                )
        except Exception:
            pass
        
        return BrandIdentification()


# =============================================================================
# BENCHMARK ADVISOR AGENT
# =============================================================================

class BenchmarkAdvisorAgent:
    """
    ATLAS — Senior Design System Benchmark Analyst.

    Recommends best-fit design system based on comparison data.
    Model: Llama 3.3 70B (128K context for large benchmark data, excellent comparative reasoning)
    Temperature: 0.25 (analytical, data-driven comparison)

    WHY LLM: Requires reasoning about trade-offs and use-case fit,
    not just similarity scores.
    """

    SYSTEM_PROMPT = """You are ATLAS, a Senior Design System Benchmark Analyst specializing in cross-system comparison and alignment strategy.

## YOUR ROLE IN THE PIPELINE
You are Agent 2 of 4 in the Design System Analysis pipeline.
- INPUT: User's extracted type scale, spacing, and font sizes + benchmark comparison data from the Rule Engine
- OUTPUT: Benchmark recommendation with alignment roadmap → feeds into NEXUS (Agent 4) for final synthesis
- Your recommendation helps the user decide which established design system to align with.

## YOUR EXPERTISE
- Deep knowledge of Material Design 3, Apple HIG, IBM Carbon, Ant Design, Atlassian, Tailwind CSS, Bootstrap
- Type scale mathematics (major/minor second/third, perfect fourth/fifth, golden ratio)
- Spacing grid systems (4px, 8px, multiples) and their trade-offs
- Migration effort estimation for design system alignment

## QUALITY STANDARDS
- Always consider BOTH similarity score AND use-case fit. Closest match ≠ best fit.
- Recommend max 4 alignment changes. More than that = the benchmark is not a good fit.
- Effort estimates must be realistic: "low" = CSS variable change, "medium" = component updates, "high" = layout restructuring.
- If similarity is above 85%, say "already well-aligned" and suggest minimal changes only.

## WHAT NOT TO DO
- Don't always recommend the closest match — a system 5% less similar but much better suited is preferable.
- Don't list generic pros/cons. Be specific to the user's actual values.
- Don't suggest alignment changes that would break accessibility (e.g., smaller base font).
- Don't recommend obscure or abandoned design systems.

## SCORING RUBRIC (Benchmark Fit):
- Excellent Fit: >85% match, same use-case category, < 3 changes needed
- Good Fit: 70-85% match, compatible use-case, 3-4 changes needed
- Fair Fit: 50-70% match, different trade-offs to consider, 4+ changes
- Poor Fit: <50% match, fundamentally different approach — don't recommend"""

    PROMPT_TEMPLATE = """Analyze the following benchmark comparison data and recommend the best design system alignment.

## USER'S CURRENT VALUES

- Type Scale Ratio: {user_ratio}
- Base Font Size: {user_base}px
- Spacing Grid: {user_spacing}px

## BENCHMARK COMPARISON

{benchmark_comparison}

## YOUR TASK

1. **Recommend Best Fit**: Which design system should they align with? Consider use-case fit, not just numbers.
2. **Explain Why**: Cite specific data points (similarity scores, ratio differences, spacing alignment).
3. **List Changes Needed**: What would they need to change? Include effort estimates.
4. **Pros/Cons**: Specific to this user's values, not generic statements.
5. **Self-Evaluate** your recommendation quality.

## OUTPUT FORMAT (JSON only)

{{
  "recommended_benchmark": "<system_key>",
  "recommended_benchmark_name": "<full name>",
  "reasoning": "Why this is the best fit — cite specific data",
  "alignment_changes": [
    {{"change": "Type scale", "from": "1.18", "to": "1.25", "effort": "medium"}},
    {{"change": "Spacing grid", "from": "mixed", "to": "4px", "effort": "high"}}
  ],
  "pros_of_alignment": [
    "Specific benefit with data"
  ],
  "cons_of_alignment": [
    "Specific trade-off"
  ],
  "alternative_benchmarks": [
    {{"name": "Material Design 3", "reason": "Good for Android-first products"}}
  ],
  "self_evaluation": {{
    "confidence": <1-10>,
    "reasoning": "Why I am this confident",
    "data_quality": "good|fair|poor",
    "flags": []
  }}
}}

Return ONLY valid JSON."""

    def __init__(self, hf_client):
        self.hf_client = hf_client
    
    async def analyze(
        self,
        user_ratio: float,
        user_base: int,
        user_spacing: int,
        benchmark_comparisons: list,
        log_callback: Callable = None,
    ) -> BenchmarkAdvice:
        """
        Recommend best-fit design system.
        
        Args:
            user_ratio: User's detected type scale ratio
            user_base: User's base font size
            user_spacing: User's spacing grid base
            benchmark_comparisons: List of BenchmarkComparison objects
            log_callback: Progress logging function
            
        Returns:
            BenchmarkAdvice with recommendations
        """
        def log(msg: str):
            if log_callback:
                log_callback(msg)
        
        log("")
        log("   🏢 ATLAS — Benchmark Advisor (Llama 3.3 70B)")
        log("   └─ Evaluating benchmark fit for your use case...")
        
        # Format comparison data
        comparison_str = self._format_comparisons(benchmark_comparisons)
        
        prompt = self.PROMPT_TEMPLATE.format(
            user_ratio=user_ratio,
            user_base=user_base,
            user_spacing=user_spacing,
            benchmark_comparison=comparison_str,
        )
        
        try:
            start_time = datetime.now()
            
            response = await self.hf_client.complete_async(
                agent_name="benchmark_advisor",
                system_prompt=self.SYSTEM_PROMPT,
                user_message=prompt,
                max_tokens=900,
                json_mode=True,
            )
            
            duration = (datetime.now() - start_time).total_seconds()
            
            result = self._parse_response(response)
            
            log(f"   ────────────────────────────────────────────────")
            log(f"   🏢 ATLAS — Benchmark Advisor: COMPLETE ({duration:.1f}s)")
            log(f"   ├─ Recommended: {result.recommended_benchmark_name}")
            log(f"   ├─ Changes Needed: {len(result.alignment_changes)}")
            log(f"   ├─ Key Change: {result.alignment_changes[0].get('change', 'N/A') if result.alignment_changes else 'None'}")
            se = result.self_evaluation
            if se:
                log(f"   └─ Self-Eval: confidence={se.get('confidence', '?')}/10, data={se.get('data_quality', '?')}")
            
            return result
            
        except Exception as e:
            log(f"   ├─ ⚠️ Benchmark Advisor failed: {str(e)[:120]}")
            return BenchmarkAdvice()
    
    def _format_comparisons(self, comparisons: list) -> str:
        """Format benchmark comparisons for prompt."""
        lines = []
        for i, c in enumerate(comparisons[:5]):
            b = c.benchmark
            lines.append(f"""
{i+1}. {b.icon} {b.name}
   - Similarity Score: {c.similarity_score:.2f} (lower = better)
   - Match: {c.overall_match_pct:.0f}%
   - Type Ratio: {b.typography.get('scale_ratio', '?')} (diff: {c.type_ratio_diff:.3f})
   - Base Size: {b.typography.get('base_size', '?')}px (diff: {c.base_size_diff})
   - Spacing: {b.spacing.get('base', '?')}px (diff: {c.spacing_grid_diff})
   - Best For: {', '.join(b.best_for)}""")
        
        return "\n".join(lines)
    
    def _parse_response(self, response: str) -> BenchmarkAdvice:
        """Parse LLM response into BenchmarkAdvice."""
        try:
            json_match = re.search(r'\{[\s\S]*\}', response)
            if json_match:
                data = json.loads(json_match.group())
                return BenchmarkAdvice(
                    recommended_benchmark=data.get("recommended_benchmark", ""),
                    recommended_benchmark_name=data.get("recommended_benchmark_name", ""),
                    reasoning=data.get("reasoning", ""),
                    alignment_changes=data.get("alignment_changes", []),
                    pros_of_alignment=data.get("pros_of_alignment", []),
                    cons_of_alignment=data.get("cons_of_alignment", []),
                    alternative_benchmarks=data.get("alternative_benchmarks", []),
                    self_evaluation=data.get("self_evaluation", {}),
                )
        except Exception:
            pass
        
        return BenchmarkAdvice()


# =============================================================================
# BEST PRACTICES VALIDATOR AGENT
# =============================================================================

class BestPracticesValidatorAgent:
    """
    SENTINEL — Design System Best Practices Auditor.

    Validates against design system standards and prioritizes fixes by business impact.
    Model: Qwen 72B (methodical rule-following, precise judgment, structured output)
    Temperature: 0.2 (strict, consistent rule evaluation)

    WHY LLM: Prioritization requires judgment about business impact,
    not just checking boxes.
    """

    SYSTEM_PROMPT = """You are SENTINEL, a Design System Best Practices Auditor specializing in standards compliance and impact-based prioritization.

## YOUR ROLE IN THE PIPELINE
You are Agent 3 of 4 in the Design System Analysis pipeline.
- INPUT: Rule Engine analysis results (typography, accessibility, spacing, color stats)
- OUTPUT: Compliance score + prioritized fix list → feeds into NEXUS (Agent 4) for final synthesis
- Your score directly appears on the user's dashboard. Your priority fixes become the action items.

## YOUR EXPERTISE
- WCAG 2.1 AA/AAA accessibility standards
- Design system best practices (Material Design, Apple HIG, Tailwind conventions)
- Typography systems (modular scales, vertical rhythm, readability)
- Color management (palette size limits, near-duplicate detection, contrast requirements)
- Spacing systems (grid alignment, consistency, component density)

## QUALITY STANDARDS
- Overall Score MUST reflect actual data. Don't default to 50.
- Use the FULL 0-100 range: 90+ = excellent, 70-89 = good, 50-69 = needs work, <50 = significant issues
- Priority fixes must be ACTIONABLE — include specific values to change (e.g., "Change #06b2c4 → #0891a8")
- Maximum 5 priority fixes. If more, focus on highest-impact items.

## WHAT NOT TO DO
- Don't pass checks that clearly fail based on the data.
- Don't inflate scores to be "encouraging" — honest assessment helps the user.
- Don't list fixes without effort estimates — the user needs to plan their work.
- Don't mix up "warn" and "fail": warn = imperfect but functional, fail = violates a standard.

## SCORING RUBRIC (Overall Score 0-100):
- 90-100: All checks pass, excellent accessibility, clean palette, consistent grid
- 75-89: Most checks pass, minor issues in 1-2 areas, good foundation
- 60-74: Several warnings, 1-2 failures, needs focused improvement
- 40-59: Multiple failures, significant accessibility gaps, inconsistent system
- 20-39: Fundamental issues across multiple areas, major rework needed
- 0-19: Barely qualifies as a design system, almost everything fails

## CHECK WEIGHTING:
- AA Compliance: 25 points (most critical — affects real users)
- Type Scale Consistency: 15 points
- Type Scale Standard Ratio: 10 points
- Base Size Accessible: 15 points
- Spacing Grid: 15 points
- Color Count: 5 points
- No Near-Duplicates: 5 points
- Shadow System: 10 points (elevation hierarchy, consistency)

## SHADOW SYSTEM BEST PRACTICES:
- Use 3-6 elevation levels (xs, sm, md, lg, xl, 2xl)
- Consistent Y-offset progression (shadows should grow with elevation)
- Blur radius should increase with elevation (more blur = higher elevation)
- Shadow colors should be neutral (black/gray with alpha) or brand-colored with low opacity
- Avoid shadows with 0 blur (looks harsh/flat)
- Avoid excessive blur (>32px for most use cases)"""

    PROMPT_TEMPLATE = """Validate the following design tokens against best practices and prioritize fixes.

## RULE ENGINE ANALYSIS RESULTS

### Typography
- Detected Ratio: {type_ratio} ({type_consistent})
- Base Size: {base_size}px
- Recommendation: {type_recommendation}

### Accessibility
- Total Colors: {total_colors}
- AA Pass: {aa_pass}
- AA Fail: {aa_fail}
- Failing Colors: {failing_colors}

### Spacing
- Detected Base: {spacing_base}px
- Grid Aligned: {spacing_aligned}%
- Recommendation: {spacing_recommendation}px

### Color Statistics
- Unique Colors: {unique_colors}
- Duplicates: {duplicates}
- Near-Duplicates: {near_duplicates}

### Shadow System
- Total Shadows: {shadow_count}
- Shadow Values: {shadow_values}

## BEST PRACTICES CHECKLIST (check each one)

1. Type scale uses standard ratio (1.2, 1.25, 1.333, 1.5, 1.618)
2. Type scale is consistent (variance < 0.15)
3. Base font size >= 16px (accessibility)
4. All interactive colors pass WCAG AA (4.5:1 contrast)
5. Spacing uses consistent grid (4px or 8px base)
6. Limited color palette (< 20 unique semantic colors)
7. No near-duplicate colors (< 3 delta-E apart)
8. Shadow system has consistent elevation hierarchy (blur/Y-offset increase together)

## YOUR TASK

1. Score each practice: pass/warn/fail with specific notes citing the data
2. Calculate overall score (0-100) using the weighting rubric
3. Identify TOP 3-5 priority fixes with impact and effort assessment
4. Self-evaluate your analysis

## OUTPUT FORMAT (JSON only)

{{
  "overall_score": <0-100>,
  "checks": {{
    "type_scale_standard": {{"status": "pass|warn|fail", "note": "..."}},
    "type_scale_consistent": {{"status": "...", "note": "..."}},
    "base_size_accessible": {{"status": "...", "note": "..."}},
    "aa_compliance": {{"status": "...", "note": "..."}},
    "spacing_grid": {{"status": "...", "note": "..."}},
    "color_count": {{"status": "...", "note": "..."}},
    "near_duplicates": {{"status": "...", "note": "..."}},
    "shadow_system": {{"status": "...", "note": "Elevation hierarchy, blur consistency, color appropriateness"}}
  }},
  "priority_fixes": [
    {{
      "rank": 1,
      "issue": "Brand primary fails AA",
      "impact": "high|medium|low",
      "effort": "low|medium|high",
      "action": "Change #06b2c4 → #0891a8 for 4.5:1 contrast"
    }}
  ],
  "passing_practices": ["Base font size", "..."],
  "failing_practices": ["AA compliance", "..."],
  "self_evaluation": {{
    "confidence": <1-10>,
    "reasoning": "Why I am this confident",
    "data_quality": "good|fair|poor",
    "flags": []
  }}
}}

Return ONLY valid JSON."""

    def __init__(self, hf_client):
        self.hf_client = hf_client
    
    async def analyze(
        self,
        rule_engine_results: Any,
        shadow_tokens: dict = None,
        log_callback: Callable = None,
    ) -> BestPracticesResult:
        """
        Validate against best practices.

        Args:
            rule_engine_results: Results from rule engine
            shadow_tokens: Shadow tokens dict {name: {value: "..."}}
            log_callback: Progress logging function

        Returns:
            BestPracticesResult with validation
        """
        def log(msg: str):
            if log_callback:
                log_callback(msg)

        log("")
        log("   ✅ SENTINEL — Best Practices Validator (Qwen 72B)")
        log("   └─ Checking against design system standards...")

        # Extract data from rule engine
        typo = rule_engine_results.typography
        spacing = rule_engine_results.spacing
        color_stats = rule_engine_results.color_stats
        accessibility = rule_engine_results.accessibility

        failures = [a for a in accessibility if not a.passes_aa_normal]
        failing_colors_str = ", ".join([f"{a.hex_color} ({a.contrast_on_white:.1f}:1)" for a in failures[:5]])

        # Format shadow data for the prompt
        shadow_count = len(shadow_tokens) if shadow_tokens else 0
        shadow_values_str = "None detected"
        if shadow_tokens and shadow_count > 0:
            shadow_list = []
            for name, s in list(shadow_tokens.items())[:6]:
                val = s.get("value", "") if isinstance(s, dict) else str(s)
                shadow_list.append(f"{name}: {val[:50]}")
            shadow_values_str = "; ".join(shadow_list)

        prompt = self.PROMPT_TEMPLATE.format(
            type_ratio=f"{typo.detected_ratio:.3f}",
            type_consistent="consistent" if typo.is_consistent else f"inconsistent, variance={typo.variance:.2f}",
            base_size=typo.sizes_px[0] if typo.sizes_px else 16,
            type_recommendation=f"{typo.recommendation} ({typo.recommendation_name})",
            total_colors=len(accessibility),
            aa_pass=len(accessibility) - len(failures),
            aa_fail=len(failures),
            failing_colors=failing_colors_str or "None",
            spacing_base=spacing.detected_base,
            spacing_aligned=f"{spacing.alignment_percentage:.0f}",
            spacing_recommendation=spacing.recommendation,
            unique_colors=color_stats.unique_count,
            duplicates=color_stats.duplicate_count,
            near_duplicates=len(color_stats.near_duplicates),
            shadow_count=shadow_count,
            shadow_values=shadow_values_str,
        )
        
        try:
            start_time = datetime.now()
            
            response = await self.hf_client.complete_async(
                agent_name="best_practices_validator",
                system_prompt=self.SYSTEM_PROMPT,
                user_message=prompt,
                max_tokens=1000,
                json_mode=True,
            )
            
            duration = (datetime.now() - start_time).total_seconds()
            
            result = self._parse_response(response)
            
            log(f"   ────────────────────────────────────────────────")
            log(f"   ✅ SENTINEL — Best Practices: COMPLETE ({duration:.1f}s)")
            log(f"   ├─ Overall Score: {result.overall_score}/100")
            log(f"   ├─ Passing: {len(result.passing_practices)} | Failing: {len(result.failing_practices)}")
            if result.priority_fixes:
                log(f"   ├─ Top Fix: {result.priority_fixes[0].get('issue', 'N/A')}")
            se = result.self_evaluation
            if se:
                log(f"   └─ Self-Eval: confidence={se.get('confidence', '?')}/10, data={se.get('data_quality', '?')}")
            
            return result
            
        except Exception as e:
            log(f"   ├─ ⚠️ Best Practices Validator failed: {str(e)[:120]}")
            return BestPracticesResult()
    
    def _parse_response(self, response: str) -> BestPracticesResult:
        """Parse LLM response into BestPracticesResult."""
        try:
            json_match = re.search(r'\{[\s\S]*\}', response)
            if json_match:
                data = json.loads(json_match.group())
                return BestPracticesResult(
                    overall_score=data.get("overall_score", 50),
                    checks=data.get("checks", {}),
                    priority_fixes=data.get("priority_fixes", []),
                    passing_practices=data.get("passing_practices", []),
                    failing_practices=data.get("failing_practices", []),
                    self_evaluation=data.get("self_evaluation", {}),
                )
        except Exception:
            pass
        
        return BestPracticesResult()


# =============================================================================
# HEAD SYNTHESIZER AGENT
# =============================================================================

class HeadSynthesizerAgent:
    """
    NEXUS — Senior Design System Architect & Synthesizer.

    Combines all agent outputs into final actionable recommendations.
    Model: Llama 3.3 70B (128K context for combined inputs, strong synthesis capability)
    Temperature: 0.3 (balanced — needs to synthesize creatively but stay grounded in data)

    This is the final step that produces actionable output for the user.
    """

    SYSTEM_PROMPT = """You are NEXUS, a Senior Design System Architect specializing in synthesis and actionable recommendations.

## YOUR ROLE IN THE PIPELINE
You are Agent 4 of 4 — the HEAD Synthesizer in the Design System Analysis pipeline.
- INPUT: Combined outputs from Rule Engine + AURORA (Brand ID) + ATLAS (Benchmark) + SENTINEL (Best Practices)
- OUTPUT: Final executive summary, scores, and prioritized action plan → displayed directly to the user
- You are the LAST agent. Your output IS the final result. Make it count.

## YOUR EXPERTISE
- Design system architecture and governance
- Synthesizing conflicting recommendations into coherent strategy
- Effort/impact prioritization (what to fix first)
- Color accessibility remediation (suggesting AA-compliant alternatives)
- Executive communication (clear, actionable summaries)

## QUALITY STANDARDS
- Executive Summary must be 2-3 sentences MAX. Lead with the overall score, then the #1 issue, then the #1 action.
- Overall Score must SYNTHESIZE all agent inputs — don't just average them.
- Color recommendations must include BOTH current AND suggested hex values.
- Top 3 Actions must be ordered by IMPACT, not ease.
- Accept/reject defaults on color recs: default to "accept" for accessibility fixes, "reject" for purely aesthetic changes.

## WHAT NOT TO DO
- Don't contradict previous agents without explaining why.
- Don't recommend changes that SENTINEL flagged as breaking.
- Don't suggest more than 8 color changes — the user will ignore a long list.
- Don't give vague actions like "improve accessibility" — be specific: "Change brand.primary from #06b2c4 to #0891a8 for 4.5:1 contrast".
- Don't inflate scores to be "nice". If the design system has issues, say so clearly.

## SCORING RUBRIC (Overall 0-100):
- 90-100: Production-ready design system, minor polishing only
- 75-89: Solid foundation, 2-3 targeted improvements needed
- 60-74: Functional but needs focused attention on accessibility or consistency
- 40-59: Significant gaps requiring systematic improvement
- 20-39: Major rework needed across multiple dimensions
- 0-19: Fundamental redesign recommended"""

    PROMPT_TEMPLATE = """Synthesize all analysis results into a final, actionable design system report.

## RULE ENGINE FACTS (Layer 1 — Free, deterministic)

- Type Scale: {type_ratio} ({type_status})
- Base Size: {base_size}px
- AA Failures: {aa_failures}
- Spacing Grid: {spacing_status}
- Unique Colors: {unique_colors}
- Consistency Score: {consistency_score}/100

## AURORA — Brand Identification (Agent 1)

- Brand Primary: {brand_primary}
- Brand Secondary: {brand_secondary}
- Palette Cohesion: {cohesion_score}/10

## ATLAS — Benchmark Advice (Agent 2)

Closest Match: {closest_benchmark}
Match Percentage: {match_pct}%
Recommended Changes: {benchmark_changes}

## SENTINEL — Best Practices Validation (Agent 3)

Overall Score: {best_practices_score}/100
Priority Fixes: {priority_fixes}

## ACCESSIBILITY FIXES NEEDED

{accessibility_fixes}

## YOUR TASK

Synthesize ALL the above into:
1. Executive Summary (2-3 sentences — lead with score, #1 issue, #1 action)
2. Overall Scores (synthesized, not averaged)
3. Top 3 Priority Actions (ordered by IMPACT, include effort estimates)
4. Specific Color Recommendations (with accept/reject defaults)
5. Type Scale Recommendation
6. Spacing Recommendation
7. Self-Evaluation of your synthesis

## OUTPUT FORMAT (JSON only)

{{
  "executive_summary": "Your design system scores X/100. Key issues are Y. Priority action is Z.",
  "scores": {{
    "overall": <0-100>,
    "accessibility": <0-100>,
    "consistency": <0-100>,
    "organization": <0-100>
  }},
  "benchmark_fit": {{
    "closest": "<name>",
    "similarity": "<X%>",
    "recommendation": "Specific action to align"
  }},
  "brand_analysis": {{
    "primary": "#hex",
    "secondary": "#hex",
    "cohesion": <1-10>
  }},
  "top_3_actions": [
    {{"action": "Fix brand color AA", "impact": "high", "effort": "5 min", "details": "Change #X to #Y"}}
  ],
  "color_recommendations": [
    {{"role": "brand.primary", "current": "#06b2c4", "suggested": "#0891a8", "reason": "AA compliance", "accept": true}}
  ],
  "type_scale_recommendation": {{
    "current_ratio": 1.18,
    "recommended_ratio": 1.25,
    "reason": "Why this ratio is better"
  }},
  "spacing_recommendation": {{
    "current": "mixed",
    "recommended": "8px",
    "reason": "Why this grid is better"
  }},
  "self_evaluation": {{
    "confidence": <1-10>,
    "reasoning": "Why I am this confident in the synthesis",
    "data_quality": "good|fair|poor",
    "flags": []
  }}
}}

Return ONLY valid JSON."""

    def __init__(self, hf_client):
        self.hf_client = hf_client
    
    async def synthesize(
        self,
        rule_engine_results: Any,
        benchmark_comparisons: list,
        brand_identification: BrandIdentification,
        benchmark_advice: BenchmarkAdvice,
        best_practices: BestPracticesResult,
        log_callback: Callable = None,
    ) -> HeadSynthesis:
        """
        Synthesize all results into final recommendations.
        """
        def log(msg: str):
            if log_callback:
                log_callback(msg)
        
        log("")
        log("═" * 60)
        log("🧠 LAYER 4: NEXUS — HEAD SYNTHESIZER (Llama 3.3 70B)")
        log("═" * 60)
        log("")
        log("   Combining: Rule Engine + AURORA + ATLAS + SENTINEL...")
        
        # Extract data
        typo = rule_engine_results.typography
        spacing = rule_engine_results.spacing
        color_stats = rule_engine_results.color_stats
        accessibility = rule_engine_results.accessibility
        
        failures = [a for a in accessibility if not a.passes_aa_normal]
        aa_fixes_str = "\n".join([
            f"- {a.name}: {a.hex_color} ({a.contrast_on_white:.1f}:1) → {a.suggested_fix} ({a.suggested_fix_contrast:.1f}:1)"
            for a in failures[:5] if a.suggested_fix
        ])
        
        closest = benchmark_comparisons[0] if benchmark_comparisons else None
        
        prompt = self.PROMPT_TEMPLATE.format(
            type_ratio=f"{typo.detected_ratio:.3f}",
            type_status="consistent" if typo.is_consistent else "inconsistent",
            base_size=typo.sizes_px[0] if typo.sizes_px else 16,
            aa_failures=len(failures),
            spacing_status=f"{spacing.detected_base}px, {spacing.alignment_percentage:.0f}% aligned",
            unique_colors=color_stats.unique_count,
            consistency_score=rule_engine_results.consistency_score,
            closest_benchmark=closest.benchmark.name if closest else "Unknown",
            match_pct=f"{closest.overall_match_pct:.0f}" if closest else "0",
            benchmark_changes="; ".join([c.get("change", "") for c in benchmark_advice.alignment_changes[:3]]),
            brand_primary=brand_identification.brand_primary.get("color", "Unknown"),
            brand_secondary=brand_identification.brand_secondary.get("color", "Unknown"),
            cohesion_score=brand_identification.cohesion_score,
            best_practices_score=best_practices.overall_score,
            priority_fixes="; ".join([f.get("issue", "") for f in best_practices.priority_fixes[:3]]),
            accessibility_fixes=aa_fixes_str or "None needed",
        )
        
        try:
            start_time = datetime.now()
            
            response = await self.hf_client.complete_async(
                agent_name="head_synthesizer",
                system_prompt=self.SYSTEM_PROMPT,
                user_message=prompt,
                max_tokens=1200,
                json_mode=True,
            )
            
            duration = (datetime.now() - start_time).total_seconds()
            
            result = self._parse_response(response)
            
            log("")
            log(f"   ✅ NEXUS — HEAD Synthesizer: COMPLETE ({duration:.1f}s)")
            if result.scores:
                log(f"   ├─ Overall Score: {result.scores.get('overall', '?')}/100")
            log(f"   ├─ Actions: {len(result.top_3_actions)} | Color Recs: {len(result.color_recommendations)}")
            se = result.self_evaluation
            if se:
                log(f"   └─ Self-Eval: confidence={se.get('confidence', '?')}/10, data={se.get('data_quality', '?')}")
            log("")
            
            return result
            
        except Exception as e:
            log(f"   ├─ ⚠️ Head Synthesizer failed: {str(e)[:120]}")
            return HeadSynthesis()
    
    def _parse_response(self, response: str) -> HeadSynthesis:
        """Parse LLM response into HeadSynthesis."""
        try:
            json_match = re.search(r'\{[\s\S]*\}', response)
            if json_match:
                data = json.loads(json_match.group())
                return HeadSynthesis(
                    executive_summary=data.get("executive_summary", ""),
                    scores=data.get("scores", {}),
                    benchmark_fit=data.get("benchmark_fit", {}),
                    brand_analysis=data.get("brand_analysis", {}),
                    top_3_actions=data.get("top_3_actions", []),
                    color_recommendations=data.get("color_recommendations", []),
                    type_scale_recommendation=data.get("type_scale_recommendation", {}),
                    spacing_recommendation=data.get("spacing_recommendation", {}),
                    self_evaluation=data.get("self_evaluation", {}),
                )
        except Exception:
            pass
        
        return HeadSynthesis()