"""
Data Analysis Module - AI-assisted analysis of survey responses
"""
import json
import sys
import os
from typing import Dict, List, Optional
from collections import Counter

# Add parent directory to path for imports
sys.path.insert(0, os.path.dirname(__file__))

from llm_backend import LLMBackend


class DataAnalyzer:
    """
    Analyzes survey responses to uncover key findings, trends, and patterns.
    Provides AI-assisted summaries for qualitative research data.
    """

    def __init__(self, llm_backend: LLMBackend):
        self.llm = llm_backend

    def analyze_responses(self, responses: List[Dict], questions: List[Dict] = None) -> Dict:
        """
        Comprehensive analysis of survey responses.

        Args:
            responses: List of response dictionaries
            questions: Optional list of questions for context

        Returns:
            Analysis results including themes, sentiment, and insights
        """
        if not responses:
            return {"error": "No responses to analyze"}

        analysis = {
            "summary": {},
            "themes": [],
            "sentiment": {},
            "key_insights": [],
            "response_count": len(responses)
        }

        # Generate overall summary
        analysis["summary"] = self._generate_summary(responses, questions)

        # Extract themes
        analysis["themes"] = self._extract_themes(responses)

        # Analyze sentiment
        analysis["sentiment"] = self._analyze_sentiment(responses)

        # Generate key insights
        analysis["key_insights"] = self._generate_insights(responses, questions)

        # Add quantitative stats if applicable
        analysis["statistics"] = self._compute_statistics(responses, questions)

        return analysis

    def _generate_summary(self, responses: List[Dict], questions: List[Dict] = None) -> Dict:
        """Generate an executive summary of responses"""
        # Prepare context
        response_texts = self._extract_text_responses(responses)
        sample_size = min(50, len(response_texts))  # Use sample for large datasets
        sample_responses = response_texts[:sample_size]

        context = f"Total responses: {len(responses)}\n\n"
        if questions:
            context += "Questions asked:\n"
            for i, q in enumerate(questions[:10], 1):  # Limit to first 10 questions
                context += f"{i}. {q.get('question_text', '')}\n"
            context += "\n"

        context += "Sample responses:\n"
        for i, resp in enumerate(sample_responses, 1):
            context += f"{i}. {resp[:200]}...\n"  # Truncate long responses

        prompt = f"""Task: Analyze survey responses and generate an executive summary

{context}

**Your Analysis Should Include:**

1. **Overview:** A clear, concise high-level summary of what the data reveals (2-3 sentences)
2. **Key Patterns:** Main patterns, trends, or recurring themes observed across responses
3. **Notable Findings:** Interesting, surprising, or unexpected discoveries in the data
4. **Response Quality:** Assessment of how thoughtful, engaged, and detailed the responses are

**Output Format:** Respond ONLY with valid JSON:
{{
  "overview": "Clear summary of overall findings",
  "key_patterns": ["pattern 1", "pattern 2", "pattern 3"],
  "notable_findings": ["surprising finding 1", "unexpected discovery"],
  "response_quality": "Assessment of engagement level"
}}

**Important:** Ensure your response is valid JSON that can be parsed. Do not include any text outside the JSON object."""

        messages = [
            {"role": "system", "content": self._get_analyst_system_prompt()},
            {"role": "user", "content": prompt}
        ]

        try:
            response = self.llm.generate(messages, max_tokens=1000, temperature=0.5)
            return self._parse_json_response(response)
        except Exception as e:
            return {"error": f"Summary generation failed: {str(e)}"}

    def _extract_themes(self, responses: List[Dict], num_themes: int = 5) -> List[Dict]:
        """Extract main themes from responses using AI"""
        response_texts = self._extract_text_responses(responses)

        if not response_texts:
            return []

        # Sample for large datasets
        sample_size = min(100, len(response_texts))
        sample_responses = response_texts[:sample_size]

        prompt = f"""Task: Extract and analyze themes from survey responses

**Data:** Analyzing {len(sample_responses)} survey responses

Responses:
{self._format_responses_for_prompt(sample_responses)}

**Your Task:** Identify the top {num_themes} distinct themes that emerge from these responses.

**For Each Theme, Provide:**
1. **Theme Name:** A short, memorable, and descriptive label
2. **Description:** Clear explanation of what this theme represents and its significance
3. **Prevalence:** Estimated percentage of responses that mention or relate to this theme
4. **Example Quotes:** 2-3 actual, representative quotes from responses that illustrate this theme

**Output Format:** Respond ONLY with a valid JSON array:
[
  {{
    "theme_name": "Clear, concise theme label",
    "description": "What this theme means and why it matters",
    "prevalence": "XX%",
    "example_quotes": ["exact quote from responses", "another quote"]
  }}
]

**Important:** Ensure all responses are valid JSON. Do not include text outside the array."""

        messages = [
            {"role": "system", "content": self._get_analyst_system_prompt()},
            {"role": "user", "content": prompt}
        ]

        try:
            response = self.llm.generate(messages, max_tokens=1500, temperature=0.6)
            themes = self._parse_json_response(response)
            if isinstance(themes, list):
                return themes
            return []
        except Exception as e:
            return [{"error": f"Theme extraction failed: {str(e)}"}]

    def _analyze_sentiment(self, responses: List[Dict]) -> Dict:
        """Analyze overall sentiment of responses"""
        response_texts = self._extract_text_responses(responses)

        if not response_texts:
            return {}

        # Sample for analysis
        sample_size = min(100, len(response_texts))
        sample_responses = response_texts[:sample_size]

        prompt = f"""Task: Analyze sentiment across survey responses

**Data:** Analyzing sentiment in {len(sample_responses)} survey responses

Responses:
{self._format_responses_for_prompt(sample_responses)}

**Your Task:** Conduct a comprehensive sentiment analysis of these responses.

**Analysis Should Include:**
1. **Overall Sentiment:** The dominant sentiment tone (positive, negative, neutral, or mixed)
2. **Sentiment Distribution:** Estimated percentage breakdown across sentiment categories
3. **Emotional Tone:** Key emotions or emotional themes detected in responses
4. **Intensity:** The strength of the sentiments (low, moderate, or high)

**Output Format:** Respond ONLY with valid JSON:
{{
  "overall_sentiment": "positive|negative|neutral|mixed",
  "distribution": {{
    "positive": "XX%",
    "neutral": "XX%",
    "negative": "XX%"
  }},
  "emotions": ["emotion1", "emotion2", "emotion3"],
  "intensity": "low|moderate|high"
}}

**Important:** Return only valid JSON. Do not include explanatory text."""

        messages = [
            {"role": "system", "content": self._get_analyst_system_prompt()},
            {"role": "user", "content": prompt}
        ]

        try:
            response = self.llm.generate(messages, max_tokens=500, temperature=0.4)
            return self._parse_json_response(response)
        except Exception as e:
            return {"error": f"Sentiment analysis failed: {str(e)}"}

    def _generate_insights(self, responses: List[Dict], questions: List[Dict] = None) -> List[str]:
        """Generate actionable insights from the data"""
        response_texts = self._extract_text_responses(responses)

        if not response_texts:
            return []

        sample_size = min(100, len(response_texts))
        sample_responses = response_texts[:sample_size]

        context = f"Analyzing {len(responses)} survey responses.\n\n"
        if questions:
            context += "Research questions:\n"
            for i, q in enumerate(questions[:5], 1):
                context += f"{i}. {q.get('question_text', '')}\n"
            context += "\n"

        prompt = f"""{context}

Sample responses:
{self._format_responses_for_prompt(sample_responses)}

**Task:** Extract key insights from this survey data

**Generate 5-7 actionable insights** that address:
- Understanding the target audience and their needs
- Identifying opportunities for growth or improvement
- Recognizing challenges or pain points
- Understanding patterns, trends, and correlations
- Informing strategic or product decisions

**Insight Quality Criteria:**
- **Specific:** Clear, concrete statements based on actual data patterns
- **Actionable:** Can be used to inform decisions or actions
- **Evidence-based:** Grounded in what respondents actually said
- **Concise:** Clear and to the point (1-2 sentences each)

**Output Format:** Respond ONLY with a valid JSON array of insight strings:
["Clear, actionable insight from the data", "Another specific insight", ...]

**Important:** Return only JSON array. Do not include explanatory text."""

        messages = [
            {"role": "system", "content": self._get_analyst_system_prompt()},
            {"role": "user", "content": prompt}
        ]

        try:
            response = self.llm.generate(messages, max_tokens=1000, temperature=0.6)
            insights = self._parse_json_response(response)
            if isinstance(insights, list):
                return insights
            return []
        except Exception as e:
            return [f"Insight generation failed: {str(e)}"]

    def _compute_statistics(self, responses: List[Dict], questions: List[Dict] = None) -> Dict:
        """Compute basic statistics from responses"""
        stats = {
            "total_responses": len(responses),
            "response_lengths": {},
            "completion_rate": "N/A"
        }

        # Calculate average response length
        response_texts = self._extract_text_responses(responses)
        if response_texts:
            lengths = [len(r.split()) for r in response_texts]
            stats["response_lengths"] = {
                "avg_words": sum(lengths) / len(lengths),
                "min_words": min(lengths),
                "max_words": max(lengths)
            }

        # Calculate completion rate if questions are provided
        if questions:
            total_questions = len(questions)
            completed_questions = 0
            for response in responses:
                if isinstance(response, dict):
                    completed_questions += len([v for v in response.values() if v])

            if total_questions > 0:
                completion_rate = (completed_questions / (total_questions * len(responses))) * 100
                stats["completion_rate"] = f"{completion_rate:.1f}%"

        return stats

    def generate_report(self, analysis_results: Dict, format: str = "markdown") -> str:
        """
        Generate a formatted report from analysis results.

        Args:
            analysis_results: Results from analyze_responses()
            format: Output format (markdown, text, html)

        Returns:
            Formatted report string
        """
        if format == "markdown":
            return self._generate_markdown_report(analysis_results)
        elif format == "html":
            return self._generate_html_report(analysis_results)
        else:
            return self._generate_text_report(analysis_results)

    def _generate_markdown_report(self, results: Dict) -> str:
        """Generate markdown formatted report"""
        report = "# Survey Analysis Report\n\n"

        # Summary section
        if "summary" in results and results["summary"]:
            report += "## Executive Summary\n\n"
            summary = results["summary"]
            if "overview" in summary:
                report += f"{summary['overview']}\n\n"
            if "key_patterns" in summary:
                report += "### Key Patterns\n"
                for pattern in summary["key_patterns"]:
                    report += f"- {pattern}\n"
                report += "\n"

        # Statistics
        if "statistics" in results:
            report += "## Response Statistics\n\n"
            stats = results["statistics"]
            report += f"- Total Responses: {stats.get('total_responses', 'N/A')}\n"
            if "response_lengths" in stats:
                rl = stats["response_lengths"]
                report += f"- Average Response Length: {rl.get('avg_words', 0):.1f} words\n"
            report += f"- Completion Rate: {stats.get('completion_rate', 'N/A')}\n\n"

        # Themes
        if "themes" in results and results["themes"]:
            report += "## Main Themes\n\n"
            for i, theme in enumerate(results["themes"], 1):
                if isinstance(theme, dict) and "theme_name" in theme:
                    report += f"### {i}. {theme['theme_name']}\n"
                    report += f"{theme.get('description', '')}\n\n"
                    report += f"**Prevalence:** {theme.get('prevalence', 'N/A')}\n\n"
                    if "example_quotes" in theme:
                        report += "**Example quotes:**\n"
                        for quote in theme["example_quotes"]:
                            report += f"> {quote}\n"
                        report += "\n"

        # Sentiment
        if "sentiment" in results and results["sentiment"]:
            report += "## Sentiment Analysis\n\n"
            sent = results["sentiment"]
            report += f"**Overall Sentiment:** {sent.get('overall_sentiment', 'N/A')}\n\n"
            if "distribution" in sent:
                report += "**Distribution:**\n"
                for key, value in sent["distribution"].items():
                    report += f"- {key.title()}: {value}\n"
                report += "\n"

        # Key Insights
        if "key_insights" in results and results["key_insights"]:
            report += "## Key Insights\n\n"
            for i, insight in enumerate(results["key_insights"], 1):
                report += f"{i}. {insight}\n"
            report += "\n"

        return report

    def _generate_text_report(self, results: Dict) -> str:
        """Generate plain text report"""
        # Similar to markdown but without formatting
        return self._generate_markdown_report(results).replace("#", "").replace("**", "").replace(">", "")

    def _generate_html_report(self, results: Dict) -> str:
        """Generate HTML report"""
        # Convert markdown to basic HTML
        md_report = self._generate_markdown_report(results)
        # Basic conversion (for production, use a proper markdown-to-html library)
        html = md_report.replace("# ", "<h1>").replace("\n\n", "</p>\n<p>")
        return f"<html><body>{html}</body></html>"

    def _get_analyst_system_prompt(self) -> str:
        """System prompt for analysis tasks"""
        return """You are an expert qualitative research analyst with deep expertise in:
- Thematic analysis and coding
- Sentiment analysis and emotional intelligence
- Pattern recognition in qualitative data
- Insight generation and strategic thinking
- Survey research methodology

Your analyses should be:
- Objective and evidence-based
- Nuanced and comprehensive
- Actionable and clear
- Grounded in the actual data provided

Always respond with valid JSON when requested."""

    def _extract_text_responses(self, responses: List[Dict]) -> List[str]:
        """Extract text from response objects"""
        texts = []
        for response in responses:
            if isinstance(response, dict):
                # Extract all string values
                for value in response.values():
                    if isinstance(value, str) and value.strip():
                        texts.append(value.strip())
            elif isinstance(response, str):
                texts.append(response.strip())
        return texts

    def _format_responses_for_prompt(self, responses: List[str], max_responses: int = 50) -> str:
        """Format responses for inclusion in prompt"""
        formatted = []
        for i, resp in enumerate(responses[:max_responses], 1):
            # Truncate very long responses
            truncated = resp[:300] + "..." if len(resp) > 300 else resp
            formatted.append(f"{i}. {truncated}")
        return "\n".join(formatted)

    def _parse_json_response(self, response: str):
        """Parse JSON from LLM response"""
        response = response.strip()

        # Handle code blocks
        if "```json" in response:
            start = response.find("```json") + 7
            end = response.find("```", start)
            response = response[start:end].strip()
        elif "```" in response:
            start = response.find("```") + 3
            end = response.find("```", start)
            response = response[start:end].strip()

        try:
            return json.loads(response)
        except json.JSONDecodeError:
            # Try to find JSON object or array
            if "{" in response:
                start = response.find("{")
                end = response.rfind("}") + 1
                return json.loads(response[start:end])
            elif "[" in response:
                start = response.find("[")
                end = response.rfind("]") + 1
                return json.loads(response[start:end])
            raise