import os
from pathlib import Path
from fastapi import FastAPI
from fastapi.responses import FileResponse
from fastapi.staticfiles import StaticFiles
from fastapi.middleware.cors import CORSMiddleware

from app.core.document_indexer import DocumentIndexer
from app.core.data_store import DataStore
from app.agent.agent_engine import AgentEngine
from app.api import routes_chat, routes_data, routes_proactive

app = FastAPI(
    title="ParcelPilot AI Operating System",
    description="Production-grade AI Support Agent, Model Context Protocol (MCP) Bridge & Proactive Operations Platform for CalQuity",
    version="2.0.0"
)

# CORS
app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)

# Initialize Core Services on startup
indexer = DocumentIndexer()
data_store = DataStore()
agent_engine = AgentEngine(indexer, data_store)

# Inject into route modules
routes_chat.agent_engine_instance = agent_engine
routes_data.data_store_instance = data_store
routes_data.indexer_instance = indexer
routes_proactive.data_store_instance = data_store

# Register API Routers
app.include_router(routes_chat.router)
app.include_router(routes_data.router)
app.include_router(routes_proactive.router)

@app.get("/api/health")
@app.get("/health")
def health_check():
    return {
        "status": "healthy",
        "system": "ParcelPilot AI Operations Engine",
        "snapshot_reference": str(data_store.snapshot_datetime),
        "indexed_documents": len(indexer.documents),
        "total_accounts": len(data_store.accounts),
        "total_orders": len(data_store.orders),
        "total_tickets": len(data_store.tickets),
        "mcp_enabled": True
    }

@app.get("/api/mcp/tools")
def get_mcp_tools():
    """
    CalQuity Model Context Protocol (MCP) Integration Specification.
    Exposes ParcelPilot's tools as standard MCP JSON schemas for external AI agent integration.
    """
    return {
        "mcp_version": "1.0.0",
        "server_name": "parcelpilot-mcp-server",
        "description": "ParcelPilot AI Support & Operations Tool Suite for Model Context Protocol integration.",
        "tools": [
            {
                "name": "document_search",
                "description": "Searches ParcelPilot policies, customer enterprise agreements, SOPs, and ops guides with source authority ranking.",
                "parameters": {
                    "type": "object",
                    "properties": {
                        "query": {"type": "string", "description": "Search query terms"},
                        "account_id": {"type": "string", "description": "Target account ID for privacy scoping"}
                    },
                    "required": ["query"]
                }
            },
            {
                "name": "calculate_cancellation_fee",
                "description": "Evaluates order cancellation eligibility and fee ($0 for Northstar contract waiver vs INR 250 SOP v4 default).",
                "parameters": {
                    "type": "object",
                    "properties": {
                        "order_id": {"type": "string", "description": "Order ID (e.g. ORD-1001)"}
                    },
                    "required": ["order_id"]
                }
            },
            {
                "name": "calculate_service_credit",
                "description": "Calculates failed pickup service credit eligibility (LumenWorks >4h delay rule vs SOP v4 >2h delay rule).",
                "parameters": {
                    "type": "object",
                    "properties": {
                        "order_id": {"type": "string", "description": "Order ID (e.g. ORD-2002)"}
                    },
                    "required": ["order_id"]
                }
            },
            {
                "name": "execute_action",
                "description": "Prepares state-changing actions (escalations, ticket updates, credit approvals) requiring human confirmation.",
                "parameters": {
                    "type": "object",
                    "properties": {
                        "action_name": {"type": "string", "enum": ["escalate_ticket", "update_ticket", "create_followup_task", "approve_service_credit"]},
                        "parameters": {"type": "object"}
                    },
                    "required": ["action_name"]
                }
            }
        ]
    }

frontend_dir = Path(__file__).resolve().parent.parent / "frontend"

@app.get("/")
def serve_index():
    index_file = frontend_dir / "index.html"
    if index_file.exists():
        return FileResponse(str(index_file))
    return {"message": "ParcelPilot AI Backend Server Running"}

if frontend_dir.exists():
    app.mount("/", StaticFiles(directory=str(frontend_dir)), name="static_root")

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