import sys
import os
from werkzeug.serving import run_simple

sys.path.append(os.path.dirname(os.path.abspath(__file__)))

from dotenv import load_dotenv

load_dotenv(dotenv_path=os.path.join(os.path.dirname(__file__), ".env"))

from flask import Flask, send_from_directory
from flask_cors import CORS
from constants import Constants
from api.api_blueprint import api_blueprint
from models.base import db  # 保留原本 import（即使現在沒用到）
from models.combined_labels import CombinedLabels  # 同上

import logging


# --- 1. 確保 sessions 目錄有合理預設值 ---
SESSION_DIR = Constants.SESSIONS_DIR_NAME or "/app/sessions"
Constants.SESSIONS_DIR_NAME = SESSION_DIR


def create_session_dir():
    path = Constants.SESSIONS_DIR_NAME
    if not os.path.isdir(path):
        os.makedirs(path, exist_ok=True)


def create_app():
    create_session_dir()

    # --- 2. 靜態檔：dist/ ---
    # static_folder 指向 Vite build 出來的 dist
    # static_url_path 設成 ""，讓 /assets/... 之類的路徑正確
    app = Flask(__name__, static_folder="dist", static_url_path="")

    # --- 3. API 一律掛在 /api ---
    app.register_blueprint(api_blueprint, url_prefix="/api")

    # --- 4. 簡單 health check ---
    @app.route("/api/ping")
    def ping():
        return {"status": "ok"}

    # --- 5. React / Vite SPA：所有非靜態路徑 fallback 到 index.html ---
    @app.route("/", defaults={"path": ""})
    @app.route("/<path:path>")
    def serve_spa(path: str):
        """
        1. 如果 dist 裡真的有這個檔案，就當成靜態檔案回傳
        2. 如果沒有，就回 dist/index.html，交給 React Router 處理
           例如 /case/PanTS_00009391 這種 route
        """
        # 先嘗試當成靜態檔
        if path:
            full_path = os.path.join(app.static_folder, path)
            if os.path.isfile(full_path):
                return send_from_directory(app.static_folder, path)

        # 找不到對應實體檔案 → 交給前端路由
        return send_from_directory(app.static_folder, "index.html")

    # --- 6. Log 過濾：不要一直印 /api/progress ---
    class FilterProgressRequests(logging.Filter):
        def filter(self, record):
            return "/api/progress/" not in record.getMessage()

    logging.getLogger("werkzeug").addFilter(FilterProgressRequests())

    # --- 7. CORS ---
    CORS(app)

    # --- 8. SharedArrayBuffer / WebGL 相關 header ---
    @app.after_request
    def add_security_headers(response):
        response.headers["Cross-Origin-Opener-Policy"] = "same-origin"
        response.headers["Cross-Origin-Embedder-Policy"] = "require-corp"
        return response

    return app


# 給 gunicorn 用的 WSGI app
app = create_app()


# --- 9. 本機開發（可選） ---
def find_watch_files():
    watch_dirs = ["api", "models", "services"]
    base_path = os.path.dirname(__file__)
    all_files = []
    for d in watch_dirs:
        dir_path = os.path.join(base_path, d)
        for root, _, files in os.walk(dir_path):
            for f in files:
                if f.endswith(".py"):
                    all_files.append(os.path.join(root, f))
    return all_files


if __name__ == "__main__":
    use_ssl = os.environ.get("USE_SSL", "false").lower() == "true"
    ssl_context = (
        ("../certs/localhost-cert.pem", "../certs/localhost-key.pem") if use_ssl else None
    )
    run_simple(
        hostname="0.0.0.0",
        port=5001,
        application=app,
        use_debugger=True,
        use_reloader=True,
        extra_files=find_watch_files(),
        ssl_context=ssl_context,
    )