import re
import os
from vanna import Agent, AgentConfig
from vanna.core.registry import ToolRegistry
from vanna.core.user import UserResolver, User, RequestContext
from vanna.tools import RunSqlTool
from vanna.tools.agent_memory import SaveQuestionToolArgsTool, SearchSavedCorrectToolUsesTool
from vanna.integrations.postgres import PostgresRunner
from vanna.integrations.local.agent_memory import DemoAgentMemory
from .vanna_huggingface_llm_service import VannaHuggingFaceLlmService

from typing import List, Dict, Any, Optional
from vanna.core.system_prompt import SystemPromptBuilder
from vanna.core.registry import ToolSchema
from datetime import datetime


class CustomSQLSystemPromptBuilder(SystemPromptBuilder):
    """Complete system prompt builder for Vanna SQL assistant v2."""

    VERSION = "2.2.0"

    def __init__(self, company_name: str = "CoJournalist", sql_runner: Optional[PostgresRunner] = None):
        self.company_name = company_name
        self.sql_runner = sql_runner

    async def build_system_prompt(
        self,
        user: User,
        tool_schemas: List[ToolSchema],
        context: Optional[Dict[str, Any]] = None
    ) -> str:
        today = datetime.now().strftime("%Y-%m-%d")
        username = getattr(user, "username", user.id)

        # ======================
        # BASE PROMPT
        # ======================
        prompt = f"[System Prompt v{self.VERSION}]\n\n"
        prompt += f"You are an expert SQL assistant for the company {self.company_name}.\n"
        prompt += f"Date: {today}\nUser: {username}\nGroups: {', '.join(user.group_memberships)}\n\n"

        prompt += (
            "Your role: generate correct and efficient SQL queries from natural language.\n"
            "You always respond in **raw CSV format**, with no explanation or extra text.\n"
            "You have full access to all tables and relationships described in the schema.\n"
        )

        # ======================
        # SQL DIRECTIVES
        # ======================
        prompt += (
            "\n## SQL Directives\n"
            "- Always use table aliases in JOINs\n"
            "- Never use SELECT *\n"
            "- Prefer window functions over subqueries when possible\n"
            "- Always include a LIMIT for exploratory queries\n"
            "- Format dates and numbers for readability\n"
        )

        # ======================
        # DATABASE SCHEMA
        # ======================
        if context and "database_schema" in context:
            prompt += "\n## Database Schema\n"
            prompt += context["database_schema"]
        else:
            prompt += (
                "\n## Database Schema\n"
                "Tables:\n"
                "- posts (id, title, source_url, author, published_date, image_url, type, provider_id, created_at, updated_at, dead)\n"
                "- providers (id, name)\n"
                "- provider_attributes (id, provider_id, type, name)\n"
                "- post_provider_attributes (post_id, attribute_id)\n"
                "- tags (id, name)\n"
                "- post_tags (post_id, tag_id, weight)\n"
                "\nRelationships:\n"
                "  - posts.provider_id → providers.id\n"
                "  - post_provider_attributes.post_id → posts.id\n"
                "  - post_provider_attributes.attribute_id → provider_attributes.id\n"
                "  - provider_attributes.provider_id → providers.id\n"
                "  - post_tags.post_id → posts.id\n"
                "  - post_tags.tag_id → tags.id\n"
            )

        # ======================
        # SEMANTIC INFORMATION
        # ======================
        prompt += (
            "\n## Semantic Information\n"
            "- `posts.title`: title of the content (often descriptive, may contain keywords).\n"
            "- `posts.source_url`: external link to the article or resource.\n"
            "- `posts.author`: author, journalist, or organization name (e.g., 'The New York Times').\n"
            "- `posts.published_date`: publication date.\n"
            "- `posts.type`: content type ENUM ('spotlight', 'resource', 'insight').\n"
            "- `providers.name`: name of the publishing organization (e.g., 'Nuanced', 'SND').\n"
            "- `tags.name`: thematic keyword or topic (e.g., '3D', 'AI', 'Design').\n"
            "- `post_tags.weight`: relevance score between a post and a tag.\n"
            "- `posts.dead`: boolean flag indicating if the post is dead/removed (true = dead, false = active).\n"
        )

        # ======================
        # BUSINESS LOGIC
        # ======================
        prompt += (
            "\n## Business Logic\n"
            "- **ALWAYS filter out dead posts**: Include `WHERE p.dead = false` (or `AND p.dead = false`) in every query. Never return posts where dead = true.\n"
            "- A query mentioning an organization (e.g., 'New York Times') should search both `posts.author` and `providers.name`.\n"
            "- Return all post types (spotlight, resource, insight) unless the user specifies otherwise.\n"
            "- Tags link posts to specific themes or disciplines.\n"
            "- A single post may have multiple tags, awards, or categories.\n"
            "- If the user mentions a year (e.g., 'in 2021'), filter with `EXTRACT(YEAR FROM published_date) = 2021`.\n"
            "- If the user says 'recently', filter posts from the last 90 days.\n"
            "- Always limit exploratory results to 9 rows.\n"
            "\n"
            "## CRITICAL: Search Strategy\n"
            "**IMPORTANT**: Only 3 posts currently have tags. Most posts (7,245+) are NOT tagged yet.\n"
            "\n"
            "**Hybrid Search Approach (RECOMMENDED)**:\n"
            "- ALWAYS use a hybrid approach combining tag search AND keyword search with OR logic.\n"
            "- Use LEFT JOINs for tags (not INNER JOIN) so untagged posts are included.\n"
            "\n"
            "**Keyword Matching - Use PostgreSQL Regex for Exact Word Boundaries**:\n"
            "- Use ~* operator for case-insensitive regex matching\n"
            "- Use \\m and \\M for word boundaries (start and end of word)\n"
            "- Pattern: column ~* '\\\\mkeyword\\\\M'\n"
            "- Example: p.title ~* '\\\\mf1\\\\M' matches 'F1' but NOT 'profile' or 'if'\n"
            "- This ensures exact word matching, not substring matching\n"
            "\n"
            "**When to use tag-only search**: Only if user explicitly mentions 'tagged with' or 'tag:'.\n"
            "**When to use keyword-only search**: For author/organization names, or when tags are not relevant.\n"
            "\n"
            "This ensures maximum result coverage while the database is being enriched with tags.\n"
        )

        # ======================
        # AVAILABLE TOOLS
        # ======================
        if tool_schemas:
            prompt += "\n## Available Tools\n"
            for tool in tool_schemas:
                prompt += f"- {tool.name}: {getattr(tool, 'description', 'No description')}\n"
                prompt += f"  Parameters: {getattr(tool, 'parameters', 'N/A')}\n"

        # ======================
        # MEMORY SYSTEM
        # ======================
        tool_names = [t.name for t in tool_schemas]
        has_search = "search_saved_correct_tool_uses" in tool_names
        has_save = "save_question_tool_args" in tool_names

        if has_search or has_save:
            prompt += "\n## Memory System\n"
            if has_search:
                prompt += "- Use `search_saved_correct_tool_uses` to detect past patterns.\n"
            if has_save:
                prompt += "- Use `save_question_tool_args` to store successful pairs.\n"

        # ======================
        # EXAMPLES
        # ======================
        prompt += (
            "\n## Example Interactions\n"
            "User: 'F1' or 'Show me F1 content'\n"
            "Assistant: [call run_sql with \"SELECT DISTINCT p.id, p.title, p.source_url, p.author, p.published_date, p.image_url, p.type "
            "FROM posts p "
            "LEFT JOIN post_tags pt ON p.id = pt.post_id "
            "LEFT JOIN tags t ON pt.tag_id = t.id "
            "LEFT JOIN providers pr ON p.provider_id = pr.id "
            "WHERE p.dead = false AND (t.name ~* '\\\\mf1\\\\M' OR t.name ~* '\\\\mformula\\\\M' "
            "OR p.title ~* '\\\\mf1\\\\M' OR p.title ~* '\\\\mformula\\\\M' "
            "OR p.author ~* '\\\\mf1\\\\M') "
            "ORDER BY p.published_date DESC NULLS LAST LIMIT 9;\"]\n"
            "\nUser: 'Show me posts from The New York Times'\n"
            "Assistant: [call run_sql with \"SELECT DISTINCT p.id, p.title, p.source_url, p.author, p.published_date, p.image_url, p.type "
            "FROM posts p "
            "LEFT JOIN providers pr ON p.provider_id = pr.id "
            "WHERE p.dead = false AND (p.author ~* '\\\\mnew\\\\M.*\\\\myork\\\\M.*\\\\mtimes\\\\M' OR pr.name ~* '\\\\mnew\\\\M.*\\\\myork\\\\M.*\\\\mtimes\\\\M') "
            "ORDER BY p.published_date DESC NULLS LAST LIMIT 9;\"]\n"
            "\nUser: 'interactive visualizations'\n"
            "Assistant: [call run_sql with \"SELECT DISTINCT p.id, p.title, p.source_url, p.author, p.published_date, p.image_url, p.type "
            "FROM posts p "
            "LEFT JOIN post_tags pt ON p.id = pt.post_id "
            "LEFT JOIN tags t ON pt.tag_id = t.id "
            "WHERE p.dead = false AND (t.name ~* '\\\\minteractive\\\\M' OR p.title ~* '\\\\minteractive\\\\M' "
            "OR p.title ~* '\\\\mvisualization\\\\M' OR t.name ~* '\\\\mdataviz\\\\M') "
            "ORDER BY p.published_date DESC NULLS LAST LIMIT 9;\"]\n"
        )

        # ======================
        # FINAL INSTRUCTIONS
        # ======================
        prompt += (
            "\nIMPORTANT:\n"
            "- Always return **only the raw CSV result** — no explanations, no JSON, no commentary.\n"
            "- Stop tool execution once the query result is obtained.\n"
        )

        return prompt


class SimpleUserResolver(UserResolver):
    async def resolve_user(self, request_context: RequestContext) -> User:
        user_email = request_context.get_cookie('vanna_email') or 'guest@example.com'
        group = 'admin' if user_email == 'admin@example.com' else 'user'
        return User(id=user_email, email=user_email, group_memberships=[group])


class VannaComponent:
    def __init__(
        self,
        hf_model: str,
        hf_token: str,
        hf_provider: str,
        connection_string: str,
    ):
        llm = VannaHuggingFaceLlmService(model=hf_model, token=hf_token, provider=hf_provider)

        self.sql_runner = PostgresRunner(connection_string=connection_string)
        db_tool = RunSqlTool(sql_runner=self.sql_runner)

        agent_memory = DemoAgentMemory(max_items=1000)
        save_memory_tool = SaveQuestionToolArgsTool()
        search_memory_tool = SearchSavedCorrectToolUsesTool()

        self.user_resolver = SimpleUserResolver()

        tools = ToolRegistry()
        tools.register_local_tool(db_tool, access_groups=['admin', 'user'])
        tools.register_local_tool(save_memory_tool, access_groups=['admin'])
        tools.register_local_tool(search_memory_tool, access_groups=['admin', 'user'])

        self.agent = Agent(
            llm_service=llm,
            tool_registry=tools,
            user_resolver=self.user_resolver,
            agent_memory=agent_memory,
            system_prompt_builder=CustomSQLSystemPromptBuilder("CoJournalist", self.sql_runner),
            config=AgentConfig(stream_responses=False, max_tool_iterations=3)
        )

    async def ask(self, prompt_for_llm: str):
        ctx = RequestContext()
        print(f"\n{'='*80}")
        print(f"🙋 User Query: {prompt_for_llm}")
        print(f"{'='*80}\n")

        final_text = ""
        seen_texts = set()
        query_executed = False
        result_row_count = 0

        async for component in self.agent.send_message(request_context=ctx, message=prompt_for_llm):
            simple = getattr(component, "simple_component", None)
            text = getattr(simple, "text", "") if simple else ""
            if text and text not in seen_texts:
                print(f"💬 LLM Response: {text[:300]}...")
                final_text += text + "\n"
                seen_texts.add(text)

            sql_query = getattr(component, "sql", None)
            if sql_query:
                query_executed = True
                print(f"\n🧾 SQL Query Generated:")
                print(f"{'-'*80}")
                print(f"{sql_query}")
                print(f"{'-'*80}\n")

            metadata = getattr(component, "metadata", None)
            if metadata:
                print(f"📋 Query Metadata: {metadata}")
                result_row_count = metadata.get("row_count", 0)
                if result_row_count == 0:
                    print(f"⚠️  Query returned 0 rows - no data matched the criteria")
                else:
                    print(f"✅ Query returned {result_row_count} rows")

            component_type = getattr(component, "type", None)
            if component_type:
                print(f"🔖 Component Type: {component_type}")

            match = re.search(r"query_results_[\w-]+\.csv", final_text)
            if match:
                filename = match.group(0)
                # Calculate the user-specific folder based on the default user ID
                import hashlib
                user_hash = hashlib.sha256("guest@example.com".encode()).hexdigest()[:16]
                folder = user_hash
                full_path = os.path.join(folder, filename)

                print(f"\n📁 Looking for CSV file: {full_path}")

                # Create folder if it doesn't exist
                if not os.path.exists(folder):
                    print(f"📂 Creating user directory: {folder}")
                    os.makedirs(folder, exist_ok=True)

                if os.path.exists(full_path):
                    print(f"✅ Found CSV file, reading contents...")
                    with open(full_path, "r", encoding="utf-8") as f:
                        csv_data = f.read().strip()
                    print(f"📊 CSV Data Preview: {csv_data[:200]}...")
                    print(f"{'='*80}\n")
                    return csv_data
                else:
                    print(f"❌ CSV file not found at: {full_path}")
                    # List files in the directory to help debug
                    if os.path.exists(folder):
                        files = os.listdir(folder)
                        print(f"📂 Files in {folder}: {files}")

        print(f"\n{'='*80}")
        if not query_executed:
            print(f"⚠️  No SQL query was executed by the LLM")
        print(f"📤 Returning final response to user")
        print(f"{'='*80}\n")
        return final_text