"""
Core data processing and analysis logic for the PharmaCircle AI Data Analyst.

This module orchestrates the main analysis workflow:
1.  Takes a user's natural language query.
2.  Uses the LLM to generate a structured analysis plan.
3.  Executes parallel queries against Solr for quantitative and qualitative data.
4.  Generates a data visualization using the LLM.
5.  Synthesizes the findings into a comprehensive, user-facing report.
"""


import json
import re
import datetime
import pandas as pd
import matplotlib.pyplot as plt
import seaborn as sns
import os
import concurrent.futures
import copy
import google.generativeai as genai

from llm_prompts import (
    get_analysis_plan_prompt,
    get_synthesis_report_prompt,
    get_visualization_code_prompt
)

def parse_suggestions_from_report(report_text):
    """Extracts numbered suggestions from the report's markdown text."""
    suggestions_match = re.search(r"### (?:Deeper Dive: Suggested Follow-up Analyses|Suggestions for Further Exploration)\s*\n(.*?)$", report_text, re.DOTALL | re.IGNORECASE)
    if not suggestions_match: return []
    suggestions_text = suggestions_match.group(1)
    suggestions = re.findall(r"^\s*\d+\.\s*(.*)", suggestions_text, re.MULTILINE)
    return [s.strip() for s in suggestions]

def llm_generate_analysis_plan_with_history(llm_model, natural_language_query, chat_history):
    """
    Generates a complete analysis plan from a user query, considering chat history.
    """
    prompt = get_analysis_plan_prompt(natural_language_query, chat_history)
    try:
        response = llm_model.generate_content(prompt)
        cleaned_text = re.sub(r'```json\s*|\s*```', '', response.text, flags=re.MULTILINE | re.DOTALL).strip()
        plan = json.loads(cleaned_text)
        return plan
    except Exception as e:
        raw_response_text = response.text if 'response' in locals() else 'N/A'
        print(f"Error in llm_generate_analysis_plan_with_history: {e}\nRaw Response:\n{raw_response_text}")
        return None

def execute_quantitative_query(solr_client, plan):
    """Executes the facet query to get aggregate data."""
    if not plan or 'quantitative_request' not in plan or 'json.facet' not in plan.get('quantitative_request', {}):
        return None
    try:
        params = {
            "q": plan.get('query_filter', '*_*'),
            "rows": 0,
            "json.facet": json.dumps(plan['quantitative_request']['json.facet'])
        }
        results = solr_client.search(**params)
        return results.raw_response.get("facets", {})
    except Exception as e:
        print(f"Error in quantitative query: {e}")
        return None

def execute_qualitative_query(solr_client, plan):
    """Executes the grouping query to get the best example docs."""
    if not plan or 'qualitative_request' not in plan:
        return None
    try:
        qual_request = copy.deepcopy(plan['qualitative_request'])
        params = {
            "q": plan.get('query_filter', '*_*'),
            "rows": 3,  # Get a few examples per group
            "fl": "*,score",
            **qual_request
        }
        results = solr_client.search(**params)
        return results.grouped
    except Exception as e:
        print(f"Error in qualitative query: {e}")
        return None

def llm_synthesize_enriched_report_stream(llm_model, query, quantitative_data, qualitative_data, plan):
    """
    Generates an enriched report by synthesizing quantitative aggregates
    and qualitative examples, and streams the result.
    """
    prompt = get_synthesis_report_prompt(query, quantitative_data, qualitative_data, plan)
    try:
        response_stream = llm_model.generate_content(prompt, stream=True)
        for chunk in response_stream:
            yield chunk.text
    except Exception as e:
        print(f"Error in llm_synthesize_enriched_report_stream: {e}")
        yield "Sorry, I was unable to generate a report for this data."

def llm_generate_visualization_code(llm_model, query_context, facet_data):
    """Generates Python code for visualization based on query and data."""
    prompt = get_visualization_code_prompt(query_context, facet_data)
    try:
        generation_config = genai.types.GenerationConfig(temperature=0, max_output_tokens=2048)
        response = llm_model.generate_content(prompt, generation_config=generation_config)
        code = re.sub(r'^```python\s*|```$', '', response.text, flags=re.MULTILINE)
        return code
    except Exception as e:
        print(f"Error in llm_generate_visualization_code: {e}\nRaw response: {response.text}")
        return None

def execute_viz_code_and_get_path(viz_code, facet_data):
    """Executes visualization code and returns the path to the saved plot image."""
    if not viz_code: return None
    try:
        if not os.path.exists('/tmp/plots'): os.makedirs('/tmp/plots')
        plot_path = f"/tmp/plots/plot_{datetime.datetime.now().timestamp()}.png"
        exec_globals = {'facet_data': facet_data, 'plt': plt, 'sns': sns, 'pd': pd}
        exec(viz_code, exec_globals)
        fig = exec_globals.get('fig')
        if fig:
            fig.savefig(plot_path, bbox_inches='tight')
            plt.close(fig)
            return plot_path
        return None
    except Exception as e:
        print(f"ERROR executing visualization code: {e}\n---Code---\n{viz_code}")
        return None