"""
Stability Data Extractor - LLM-Powered Format-Agnostic Extraction

This module uses LLM to understand and extract stability data from ANY file format.
No hardcoded patterns - the LLM interprets the data structure dynamically.
"""

import json
import re
from typing import Dict, List, Any, Optional
from pathlib import Path


class StabilityDataExtractor:
    """
    LLM-powered stability data extractor.
    
    Handles ANY format by using LLM to understand the data structure.
    Falls back to heuristic extraction if LLM is unavailable.
    """
    
    # Prompt for LLM to extract structured stability data
    EXTRACTION_PROMPT = """你是药物稳定性数据提取专家。请从以下文本中提取稳定性数据。

【数据内容】
{text_content}

【用户分析目标】
{goal}

【任务】
请识别并提取:
1. 批次信息（批次名称/ID）
2. 存储条件（如25°C/60%RH长期, 40°C/75%RH加速等）
3. 时间点（月）
4. 质量指标数值（如杂质含量、含量等）

【输出格式】
请严格按以下JSON格式输出:
```json
{{
    "batches": [
        {{
            "batch_id": "批次ID",
            "batch_name": "批次名称",
            "conditions": [
                {{
                    "condition_id": "条件描述（如 25C_60RH）",
                    "condition_type": "longterm|accelerated|stress",
                    "timepoints": [0, 3, 6, 9],
                    "cqa_data": [
                        {{
                            "cqa_name": "指标名称（如总杂质）",
                            "values": [0.1, 0.12, 0.15, 0.18]
                        }}
                    ]
                }}
            ]
        }}
    ],
    "specification_limit": 0.5,
    "primary_cqa": "主要质量指标名称"
}}
```

如果无法识别数据结构，请返回空的batches数组并在"extraction_notes"字段说明原因。
"""
    
    def __init__(self, model_invoker=None):
        """
        Initialize extractor.
        
        Args:
            model_invoker: LLM invoker instance (lazy-loaded if not provided)
        """
        self._model_invoker = model_invoker
        self.extracted_data = {}
        self.metadata = {}
    
    @property
    def model_invoker(self):
        """Lazy-load model invoker."""
        if self._model_invoker is None:
            try:
                from layers.model_invoker import ModelInvoker
                self._model_invoker = ModelInvoker()
            except Exception as e:
                print(f"Warning: Could not load ModelInvoker: {e}")
                self._model_invoker = None
        return self._model_invoker
    
    def extract_from_text(self, text_content: str, goal: str = "") -> Dict[str, Any]:
        """
        Extract stability data from text using LLM.
        
        Args:
            text_content: Raw text from parsed files
            goal: Analysis goal from user
            
        Returns:
            Structured data dictionary with batches
        """
        # Default result structure
        result = {
            "batches": [],
            "specification_limit": 0.5,
            "primary_cqa": "总杂质",
            "target_timepoints": self._extract_target_timepoints(goal),
            "extraction_method": "none",
            "extraction_notes": ""
        }
        
        if not text_content or len(text_content.strip()) < 50:
            result["extraction_notes"] = "文本内容过短，无法提取数据"
            return result
        
        # Try LLM extraction first
        llm_result = self._extract_with_llm(text_content, goal)
        if llm_result and llm_result.get("batches"):
            result.update(llm_result)
            result["extraction_method"] = "llm"
            return result
        
        # Fallback to heuristic extraction
        heuristic_result = self._extract_with_heuristics(text_content, goal)
        if heuristic_result and heuristic_result.get("batches"):
            result.update(heuristic_result)
            result["extraction_method"] = "heuristic"
            return result
        
        result["extraction_notes"] = "无法识别数据格式，请确保文件包含时间点和数值数据"
        return result
    
    def _extract_with_llm(self, text_content: str, goal: str) -> Optional[Dict]:
        """Use LLM to extract structured data."""
        if not self.model_invoker:
            return None
        
        try:
            # Truncate text to avoid token limits
            max_chars = 8000
            truncated_text = text_content[:max_chars]
            if len(text_content) > max_chars:
                truncated_text += "\n... [文本已截断]"
            
            prompt = self.EXTRACTION_PROMPT.format(
                text_content=truncated_text,
                goal=goal or "分析稳定性数据"
            )
            
            response = self.model_invoker.invoke(
                system_prompt="你是专业的药物稳定性数据提取助手。请从文本中提取结构化的稳定性数据。",
                user_prompt=prompt,
                temperature=0.1
            )
            
            if response and hasattr(response, 'content'):
                content = response.content
            elif isinstance(response, str):
                content = response
            else:
                return None
            
            # Parse JSON from response
            json_match = re.search(r'```json\s*([\s\S]*?)\s*```', content)
            if json_match:
                json_str = json_match.group(1)
            else:
                # Try to find raw JSON
                json_str = content.strip()
                if not json_str.startswith('{'):
                    return None
            
            extracted = json.loads(json_str)
            return extracted
            
        except Exception as e:
            print(f"LLM extraction failed: {e}")
            return None
    
    def _extract_with_heuristics(self, text_content: str, goal: str) -> Optional[Dict]:
        """
        Fallback heuristic extraction using pattern recognition.
        More flexible than previous hardcoded approach.
        """
        batches = []
        
        # Find all tables with time-series data
        tables = self._find_time_series_tables(text_content)
        
        for i, table in enumerate(tables):
            batch = self._create_batch_from_table(table, i, text_content)
            if batch:
                batches.append(batch)
        
        if batches:
            return {"batches": batches}
        
        return None
    
    def _find_time_series_tables(self, text: str) -> List[Dict]:
        """Find patterns that look like time-series data tables."""
        tables = []
        lines = text.split('\n')
        
        # Pattern for time headers: 0M, 3M, 6M or 0月, 3月 etc.
        time_pattern = r'(\d+)\s*[MmHhDd月周天]'
        
        for i, line in enumerate(lines):
            time_matches = re.findall(time_pattern, line)
            if len(time_matches) >= 2:
                # Found potential time header
                times = [int(t) for t in time_matches]
                
                # Look for data rows below
                data_rows = []
                for j in range(i+1, min(i+15, len(lines))):
                    numbers = re.findall(r'(\d+\.?\d*)', lines[j])
                    if len(numbers) >= len(times):
                        # Check if numbers are in plausible range for stability data
                        try:
                            values = [float(n) for n in numbers[:len(times)]]
                            if all(0 <= v <= 200 for v in values):  # Reasonable range
                                row_type = self._identify_row_type(lines[j])
                                data_rows.append({
                                    "values": values,
                                    "type": row_type,
                                    "raw": lines[j]
                                })
                        except:
                            pass
                
                if data_rows:
                    # Find context for batch/condition identification
                    context_start = max(0, i - 10)
                    context = '\n'.join(lines[context_start:i+1])
                    
                    tables.append({
                        "times": times,
                        "rows": data_rows,
                        "context": context,
                        "line_number": i
                    })
        
        return tables
    
    def _identify_row_type(self, line: str) -> str:
        """Identify what type of measurement a row represents."""
        line_lower = line.lower()
        
        if any(kw in line_lower for kw in ['杂质', 'impurity', '杂']):
            return 'impurity'
        elif any(kw in line_lower for kw in ['含量', 'assay', 'content']):
            return 'assay'
        elif any(kw in line_lower for kw in ['水分', 'moisture', 'water']):
            return 'moisture'
        elif any(kw in line_lower for kw in ['溶出', 'dissolution']):
            return 'dissolution'
        
        return 'unknown'
    
    def _create_batch_from_table(self, table: Dict, index: int, full_text: str) -> Optional[Dict]:
        """Create a batch structure from extracted table data."""
        context = table.get("context", "")
        
        # Try to identify batch name from context
        batch_name = self._extract_batch_name(context, full_text, index)
        
        # Try to identify condition
        condition_info = self._extract_condition(context)
        
        # Build CQA data
        cqa_list = []
        for row in table.get("rows", []):
            cqa_name = "总杂质" if row["type"] == "impurity" else (
                "含量" if row["type"] == "assay" else "质量指标"
            )
            cqa_list.append({
                "cqa_name": cqa_name,
                "values": row["values"]
            })
        
        if not cqa_list:
            return None
        
        return {
            "batch_id": batch_name.replace(" ", "_"),
            "batch_name": batch_name,
            "batch_type": "target",
            "conditions": [{
                "condition_id": condition_info["id"],
                "condition_type": condition_info["type"],
                "timepoints": table["times"],
                "cqa_data": cqa_list
            }]
        }
    
    def _extract_batch_name(self, context: str, full_text: str, index: int) -> str:
        """Extract batch name from context using various patterns."""
        patterns = [
            r'批[次号][:：\s]*([A-Za-z0-9\-_]+)',
            r'Batch[:：\s]*([A-Za-z0-9\-_]+)',
            r'([A-Z]{2,3}[-_]\d{4,}[-_]?[A-Z0-9]*)',  # Common batch ID format
            r'([SF][-_]?\d{4}[-_]?\d+)',  # SF-xxxx format
            r'样品[:：\s]*(.{3,20})',
        ]
        
        for pattern in patterns:
            match = re.search(pattern, context, re.IGNORECASE)
            if match:
                name = match.group(1).strip()
                if len(name) >= 3:
                    return name
        
        # Fallback: use numbered batch
        return f"批次{index + 1}"
    
    def _extract_condition(self, context: str) -> Dict[str, str]:
        """Extract storage condition from context."""
        context_lower = context.lower()
        
        # Check for specific conditions
        if any(kw in context_lower for kw in ['40°c', '40℃', '40c', '加速']):
            return {"id": "40C_Accelerated", "type": "accelerated"}
        elif any(kw in context_lower for kw in ['25°c', '25℃', '25c', '长期']):
            return {"id": "25C_LongTerm", "type": "longterm"}
        elif any(kw in context_lower for kw in ['60°c', '60℃', '60c', '高温']):
            return {"id": "60C_Stress", "type": "stress"}
        elif any(kw in context_lower for kw in ['30°c', '30℃', '30c', '中间']):
            return {"id": "30C_Intermediate", "type": "intermediate"}
        
        return {"id": "Unknown_Condition", "type": "unknown"}
    
    def _extract_target_timepoints(self, goal: str) -> List[int]:
        """Extract target prediction timepoints from goal text."""
        timepoints = []
        
        patterns = [
            r'(\d+)\s*[个]?月',
            r'(\d+)\s*[Mm]',
            r'(\d+)\s*months?'
        ]
        
        for pattern in patterns:
            matches = re.findall(pattern, goal)
            timepoints.extend([int(m) for m in matches])
        
        timepoints = sorted(list(set(timepoints)))
        
        if not timepoints:
            timepoints = [24, 36]
        
        return timepoints


# Convenience function for backward compatibility
def extract_stability_data(file_paths: List[str], goal: str) -> Dict[str, Any]:
    """
    Main entry point for data extraction.
    """
    from utils.file_parsers import parse_file
    
    extractor = StabilityDataExtractor()
    all_text = ""
    
    for path in file_paths:
        try:
            content = parse_file(path)
            if content:
                all_text += f"\n=== File: {path} ===\n{content}\n"
        except Exception as e:
            print(f"Error parsing {path}: {e}")
    
    return extractor.extract_from_text(all_text, goal)