import os
from pathlib import Path
from typing import List

from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware
from fastapi.staticfiles import StaticFiles

from backend.app.routers import (
    customers,
    projects,
    finance,
    settings,
    ai_settings,
    email_configs,
    cloud_docs,
    cloud_doc_config,
    portal_links,
)
from backend.app.db import Base, engine
from backend.app import models  # noqa: F401  - ensure models are imported


def create_app() -> FastAPI:
    app = FastAPI(
        title="Ops-Core",
        description="Monolithic automation & business ops platform",
        version="0.1.0",
    )

    # Ensure database tables exist (especially when running in Docker)
    @app.on_event("startup")
    def on_startup() -> None:
        Base.metadata.create_all(bind=engine)
        # Add new columns to finance_records if they don't exist (Module 6)
        try:
            from sqlalchemy import text
            with engine.connect() as conn:
                r = conn.execute(text("PRAGMA table_info(finance_records)"))
                cols = [row[1] for row in r]
                if "amount" not in cols:
                    conn.execute(text("ALTER TABLE finance_records ADD COLUMN amount NUMERIC(12,2)"))
                if "billing_date" not in cols:
                    conn.execute(text("ALTER TABLE finance_records ADD COLUMN billing_date DATE"))
                conn.commit()
        except Exception:
            pass
        # Add customers.tags if missing (customer tags for project 收纳)
        try:
            from sqlalchemy import text
            with engine.connect() as conn:
                r = conn.execute(text("PRAGMA table_info(customers)"))
                cols = [row[1] for row in r]
                if "tags" not in cols:
                    conn.execute(text("ALTER TABLE customers ADD COLUMN tags VARCHAR(512)"))
                conn.commit()
        except Exception:
            pass

    # CORS
    raw_origins = os.getenv("CORS_ORIGINS")
    if raw_origins:
        origins: List[str] = [o.strip() for o in raw_origins.split(",") if o.strip()]
    else:
        origins = ["*"]

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

    # Routers
    app.include_router(customers.router)
    app.include_router(projects.router)
    app.include_router(finance.router)
    app.include_router(settings.router)
    app.include_router(ai_settings.router)
    app.include_router(email_configs.router)
    app.include_router(cloud_docs.router)
    app.include_router(cloud_doc_config.router)
    app.include_router(portal_links.router)

    # Static data mount (for quotes, contracts, finance archives, etc.)
    data_dir = Path("data")
    data_dir.mkdir(parents=True, exist_ok=True)
    app.mount("/data", StaticFiles(directory=str(data_dir)), name="data")

    return app


app = create_app()