"""
Lightweight Flask server for the meal order form.

Serves the generated HTML form and handles order submissions.
Orders are saved as JSON files in the orders directory, one per employee per week.
"""

import json
import urllib.request
from datetime import datetime
from decimal import Decimal, ROUND_HALF_UP
from pathlib import Path

import boto3
from flask import Flask, jsonify, request, send_file

PROJECT_ROOT = Path(__file__).resolve().parents[2]
CONFIG_PATH = PROJECT_ROOT / "config.json"
OUTPUT_DIR = PROJECT_ROOT / "output"
ORDERS_DIR = PROJECT_ROOT / "orders"

app = Flask(__name__)


def load_config():
    with open(CONFIG_PATH) as f:
        return json.load(f)


def current_week() -> str:
    return datetime.now().strftime("%Y-W%U")


def latest_menu_file() -> Path | None:
    files = sorted(OUTPUT_DIR.glob("menu-*.json"), reverse=True)
    return files[0] if files else None


@app.route("/")
def index():
    form_file = OUTPUT_DIR / f"order-form-{current_week()}.html"
    if not form_file.exists():
        return "No order form generated for this week. Run generate_form.py first.", 404
    return send_file(form_file)


@app.route("/api/menu")
def get_menu():
    menu_file = latest_menu_file()
    if not menu_file:
        return jsonify(
            {"error": "No menu data available. Run scrape_menu.py first."}
        ), 404
    with open(menu_file) as f:
        return jsonify(json.load(f))


@app.route("/api/roster")
def get_roster():
    config = load_config()
    return jsonify(config.get("roster", []))


_google_client_id_cache = None


def _get_google_client_id() -> str:
    global _google_client_id_cache
    if _google_client_id_cache is None:
        config = load_config()
        _google_client_id_cache = config.get("google_client_id", "")
        if not _google_client_id_cache:
            try:
                ssm = boto3.client("ssm")
                resp = ssm.get_parameter(Name="/meal-order-manager/google-client-id")
                _google_client_id_cache = resp["Parameter"]["Value"]
            except Exception:
                _google_client_id_cache = ""
    return _google_client_id_cache


def _verify_google_token(token: str, client_id: str) -> dict | None:
    if not client_id:
        return None
    try:
        req = urllib.request.Request(
            f"https://oauth2.googleapis.com/tokeninfo?id_token={token}"
        )
        with urllib.request.urlopen(req, timeout=5) as resp:
            data = json.loads(resp.read())
        if data.get("aud") != client_id:
            return None
        return {"name": data.get("name", ""), "email": data.get("email", "")}
    except Exception:
        return None


@app.route("/api/submit-order", methods=["POST"])
def submit_order():
    data = request.get_json()
    if not data:
        return jsonify({"error": "No data received"}), 400

    google_token = data.get("google_id_token")
    if google_token:
        client_id = _get_google_client_id()
        user_info = _verify_google_token(google_token, client_id)
        if not user_info:
            return jsonify({"error": "Invalid or unauthorized Google account"}), 403
        name = user_info["name"]
        email = user_info["email"]
    else:
        name = data.get("employee_name", "").strip()
        email = data.get("employee_email", "").strip()

    items = data.get("items", [])

    if not name:
        return jsonify({"error": "Employee name is required"}), 400
    if not email:
        return jsonify({"error": "Employee email is required"}), 400
    if not items or not any(i.get("quantity", 0) > 0 for i in items):
        return jsonify({"error": "Please select at least one meal"}), 400

    config = load_config()
    TWO_PLACES = Decimal("0.01")
    bulk_pct = Decimal(str(config.get("bulk_discount_percent", 0)))
    subsidy_pct = Decimal(str(config.get("company_subsidy_percent", 0)))
    bulk_mult = Decimal("1") - (bulk_pct / Decimal("100"))
    subsidy_mult = Decimal("1") - (subsidy_pct / Decimal("100"))

    filtered = [i for i in items if i.get("quantity", 0) > 0]
    for item in filtered:
        retail = Decimal(str(item.get("retail_price", item.get("price", 0)) or 0))
        qty = Decimal(str(item.get("quantity", 0)))
        bulk_price = (retail * bulk_mult).quantize(TWO_PLACES, rounding=ROUND_HALF_UP)
        emp_price = (bulk_price * subsidy_mult).quantize(
            TWO_PLACES, rounding=ROUND_HALF_UP
        )
        subtotal = (emp_price * qty).quantize(TWO_PLACES, rounding=ROUND_HALF_UP)
        item["retail_price"] = float(retail)
        item["bulk_price"] = float(bulk_price)
        item["price"] = float(emp_price)
        item["subtotal"] = float(subtotal)

    week = current_week()
    week_dir = ORDERS_DIR / week
    week_dir.mkdir(parents=True, exist_ok=True)

    safe_name = (
        "".join(c if c.isalnum() or c in "-_ " else "" for c in name)
        .strip()
        .replace(" ", "-")
        .lower()
    )
    order_file = week_dir / f"{safe_name}.json"

    total = float(
        sum(Decimal(str(i["subtotal"])) for i in filtered).quantize(
            TWO_PLACES, rounding=ROUND_HALF_UP
        )
    )

    order = {
        "employee_name": name,
        "employee_email": email,
        "week": week,
        "submitted_at": datetime.now().isoformat(),
        "items": filtered,
        "total": total,
    }

    with open(order_file, "w") as f:
        json.dump(order, f, indent=2)

    return jsonify(
        {"status": "ok", "message": f"Order saved for {name}", "total": order["total"]}
    )


@app.route("/api/form-status/<week>")
def form_status(week: str):
    return jsonify({"week": week, "status": "open"})


@app.route("/api/orders/<week>")
def get_orders(week: str):
    week_dir = ORDERS_DIR / week
    if not week_dir.exists():
        return jsonify({"orders": [], "week": week})

    orders = []
    for f in sorted(week_dir.glob("*.json")):
        with open(f) as fh:
            orders.append(json.load(fh))

    return jsonify({"orders": orders, "week": week})


if __name__ == "__main__":
    ORDERS_DIR.mkdir(exist_ok=True)
    print(f"Menu file: {latest_menu_file()}")
    print(f"Orders dir: {ORDERS_DIR}")
    app.run(host="0.0.0.0", port=5050, debug=True)