#!/usr/bin/env python3
"""
FastAPI Routes for Email Query System
"""

from fastapi import APIRouter, HTTPException
from pydantic import BaseModel, EmailStr
from typing import List, Dict, Optional
import json

# Import our modules
from query_parser import parse_email_query, store_name_email_mapping
from email_scraper import scrape_emails_from_sender

router = APIRouter()

# Pydantic models
class NaturalQuery(BaseModel):
    query: str

class EmailMappingInput(BaseModel):
    name: str
    email: EmailStr

class EmailResponse(BaseModel):
    date: str
    time: str
    subject: str
    content: str
    message_id: str

class QueryParseResponse(BaseModel):
    status: str
    sender_intent: Optional[str] = None
    resolved_email: Optional[str] = None
    start_date: Optional[str] = None
    end_date: Optional[str] = None
    message: str
    error: Optional[str] = None

class EmailsResponse(BaseModel):
    status: str
    sender_intent: str
    resolved_email: str
    start_date: str
    end_date: str
    total_emails: int
    emails: List[EmailResponse]
    message: str

@router.post("/parse_query", response_model=QueryParseResponse)
def parse_email_query_endpoint(input_data: NaturalQuery):
    """
    Parse natural language query to extract intent and dates
    """
    try:
        result = parse_email_query(input_data.query)
        return QueryParseResponse(**result)
    except Exception as e:
        raise HTTPException(status_code=400, detail=f"Query parsing failed: {str(e)}")

@router.post("/add_email_mapping")
def add_email_mapping(mapping: EmailMappingInput):
    """
    Add new name to email mapping
    """
    try:
        store_name_email_mapping(mapping.name, mapping.email)
        return {
            "status": "success",
            "message": f"Mapping added: '{mapping.name}' → '{mapping.email}'"
        }
    except Exception as e:
        raise HTTPException(status_code=400, detail=f"Failed to add mapping: {str(e)}")

@router.post("/get_emails", response_model=EmailsResponse)
def get_emails_from_query(input_data: NaturalQuery):
    """
    Complete flow: Parse query → Resolve email → Scrape emails
    """
    try:
        # Step 1: Parse the query
        parsed_result = parse_email_query(input_data.query)
        
        if parsed_result["status"] == "need_email_input":
            raise HTTPException(
                status_code=400, 
                detail={
                    "type": "need_email_input",
                    "sender_intent": parsed_result["sender_intent"],
                    "message": parsed_result["message"]
                }
            )
        elif parsed_result["status"] == "error":
            raise HTTPException(status_code=400, detail=parsed_result["message"])
        
        # Step 2: Scrape emails
        emails = scrape_emails_from_sender(
            parsed_result["resolved_email"],
            parsed_result["start_date"],
            parsed_result["end_date"]
        )
        
        # Step 3: Format response
        email_responses = [
            EmailResponse(
                date=email["date"],
                time=email["time"],
                subject=email["subject"],
                content=email["content"],
                message_id=email["message_id"]
            )
            for email in emails
        ]
        
        return EmailsResponse(
            status="success",
            sender_intent=parsed_result["sender_intent"],
            resolved_email=parsed_result["resolved_email"],
            start_date=parsed_result["start_date"],
            end_date=parsed_result["end_date"],
            total_emails=len(emails),
            emails=email_responses,
            message=f"Found {len(emails)} emails from {parsed_result['resolved_email']}"
        )
        
    except HTTPException:
        raise
    except Exception as e:
        raise HTTPException(status_code=500, detail=f"Email retrieval failed: {str(e)}")

@router.get("/view_mappings")
def view_name_mappings():
    """
    View all stored name to email mappings
    """
    try:
        from query_parser import _load_name_mapping
        mappings = _load_name_mapping()
        return {
            "status": "success",
            "total_mappings": len(mappings),
            "mappings": mappings
        }
    except Exception as e:
        raise HTTPException(status_code=500, detail=f"Failed to load mappings: {str(e)}")

@router.get("/health")
def health_check():
    """
    Health check endpoint
    """
    return {
        "status": "healthy",
        "message": "Email query system is running"
    }

# For testing - manual endpoint to add mapping and then query
@router.post("/complete_flow")
def complete_email_flow(input_data: dict):
    """
    Test endpoint for complete flow with optional mapping
    Expected input:
    {
        "query": "emails from john last week",
        "mapping": {"name": "john", "email": "john@example.com"}  # optional
    }
    """
    try:
        query = input_data.get("query")
        mapping = input_data.get("mapping")
        
        if not query:
            raise HTTPException(status_code=400, detail="Query is required")
        
        # Add mapping if provided
        if mapping:
            store_name_email_mapping(mapping["name"], mapping["email"])
        
        # Parse and get emails
        parsed_result = parse_email_query(query)
        
        if parsed_result["status"] == "need_email_input":
            return {
                "status": "need_mapping",
                "message": parsed_result["message"],
                "sender_intent": parsed_result["sender_intent"]
            }
        
        # Get emails
        emails = scrape_emails_from_sender(
            parsed_result["resolved_email"],
            parsed_result["start_date"],
            parsed_result["end_date"]
        )
        
        return {
            "status": "success",
            "query": query,
            "parsed": parsed_result,
            "total_emails": len(emails),
            "emails": emails[:5]  # Return first 5 emails
        }
        
    except Exception as e:
        raise HTTPException(status_code=500, detail=str(e))