from fastapi import FastAPI, HTTPException
from fastapi.middleware.cors import CORSMiddleware
from pydantic import BaseModel, field_serializer
from typing import List, Optional, Dict, Any
from datetime import datetime
from db.db_utils import get_all_documents, get_document
import uvicorn
import os

app = FastAPI(
    title="AGC Document Chatbot API",
    description="API for Attorney General's Chambers Document Search and Chat System",
    version="1.0.0"
)

# Add CORS middleware
app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],  # Allows all origins
    allow_credentials=True,
    allow_methods=["*"],  # Allows all methods
    allow_headers=["*"],  # Allows all headers
)

# Pydantic models for request/response
class DocumentResponse(BaseModel):
    id: int
    title: str
    content: str
    doc_type: str
    created_at: Optional[datetime] = None
    source: Optional[str] = None

    # Serialize datetime to string
    @field_serializer('created_at')
    def serialize_created_at(self, value: Optional[datetime]) -> Optional[str]:
        if value is None:
            return None
        return value.strftime("%Y-%m-%d %H:%M:%S")

class SearchRequest(BaseModel):
    query: str
    profile_search: bool = False

class SearchResponse(BaseModel):
    query: str
    enhanced_query: str
    documents: List[Dict[str, Any]]
    answer: str

# Routes
@app.get("/")
async def root():
    return {"message": "Welcome to AGC Document Chatbot API"}

@app.get("/ping")
async def ping():
    """Health check endpoint"""
    return {"status": "ok", "message": "API is running"}

@app.get("/documents", response_model=List[DocumentResponse])
async def list_documents(
    doc_type: Optional[str] = None,
    title_filter: Optional[str] = None
):
    """Get all documents with optional filtering"""
    try:
        documents = get_all_documents()
        
        # Apply filters
        if doc_type and doc_type != "All Types":
            documents = [doc for doc in documents if doc.get('doc_type') == doc_type]
        
        if title_filter:
            documents = [
                doc for doc in documents 
                if title_filter.lower() in doc.get('title', '').lower() or 
                   title_filter.lower() in doc.get('content', '').lower()
            ]
        
        return documents
    except Exception as e:
        print(f"Error in list_documents: {str(e)}")
        raise HTTPException(status_code=500, detail=f"Error fetching documents: {str(e)}")

@app.get("/documents/{document_id}", response_model=DocumentResponse)
async def get_document_by_id(document_id: int):
    """Get a specific document by ID"""
    try:
        document = get_document(document_id)
        if not document:
            raise HTTPException(status_code=404, detail="Document not found")
        return document
    except HTTPException:
        raise
    except Exception as e:
        print(f"Error in get_document_by_id: {str(e)}")
        raise HTTPException(status_code=500, detail=f"Error fetching document: {str(e)}")

@app.get("/document/{document_id}", response_model=DocumentResponse)
async def get_document_by_id_alt(document_id: str):
    """Alternative endpoint to get a specific document by ID (supports string IDs)"""
    try:
        # If the document_id starts with 'doc', extract the numeric part
        if document_id.startswith('doc'):
            try:
                numeric_id = int(document_id[3:])
                document = get_document(numeric_id)
                if document:
                    return document
            except ValueError:
                pass  # Not a numeric ID after 'doc', continue with normal lookup
        
        # Try to convert the entire ID to an integer
        try:
            numeric_id = int(document_id)
            document = get_document(numeric_id)
            if document:
                return document
        except ValueError:
            pass  # Not a numeric ID, continue with not found
        
        raise HTTPException(status_code=404, detail="Document not found")
    except HTTPException:
        raise
    except Exception as e:
        print(f"Error in get_document_by_id_alt: {str(e)}")
        raise HTTPException(status_code=500, detail=f"Error fetching document: {str(e)}")

@app.post("/search", response_model=SearchResponse)
async def search_documents(request: SearchRequest):
    """Search documents using enhanced RAG or simple search as fallback"""
    try:
        # Check if OpenAI API key is available
        if os.getenv('OPENAI_API_KEY'):
            print("Using OpenAI-enhanced search")
            try:
                from embedding.enhanced_rag_service import enhanced_rag_search
                results = enhanced_rag_search(request.query, request.profile_search)
                return results
            except Exception as e:
                print(f"OpenAI search failed: {e}, falling back to simple search")
        
        # Fallback to simple search
        print("Using simple keyword search")
        from embedding.simple_search_service import simple_search
        results = simple_search(request.query, request.profile_search)
        return results
        
    except Exception as e:
        print(f"Error in search_documents: {str(e)}")
        raise HTTPException(status_code=500, detail=f"Error performing search: {str(e)}")

@app.get("/document-types")
async def get_document_types():
    """Get list of available document types"""
    try:
        documents = get_all_documents()
        doc_types = list(set([doc.get('doc_type', 'Unknown') for doc in documents]))
        return {"document_types": sorted(doc_types)}
    except Exception as e:
        print(f"Error in get_document_types: {str(e)}")
        raise HTTPException(status_code=500, detail=f"Error fetching document types: {str(e)}")

if __name__ == "__main__":
    uvicorn.run("api:app", host="0.0.0.0", port=8000, reload=True)