import json
import logging
import os
import threading

from flask import Flask, Response, jsonify, render_template, request, stream_with_context

import config
import database
import events
from intradesk import reference
from intradesk import api as intradesk_api
from intradesk.handler import handle_webhook

log = logging.getLogger(__name__)
app = Flask(__name__, template_folder=os.path.join(os.path.dirname(__file__), "templates"))


# ── Webhook от Intradesk ───────────────────────────────────────────────────────

@app.route("/webhook", methods=["POST"])
def webhook():
    if config.WEBHOOK_SECRET:
        secret = request.headers.get("X-Webhook-Secret") or request.args.get("secret", "")
        if secret != config.WEBHOOK_SECRET:
            log.warning("Webhook: unauthorized request")
            return jsonify({"error": "Unauthorized"}), 401

    data = request.get_json(silent=True)
    if not data:
        return jsonify({"error": "Invalid JSON"}), 400

    threading.Thread(target=handle_webhook, args=(data,), daemon=True).start()
    return jsonify({"ok": True}), 200


@app.route("/health")
def health():
    return jsonify({"status": "ok"}), 200


# ── Дашборд ────────────────────────────────────────────────────────────────────

@app.route("/")
def dashboard():
    return render_template("dashboard.html")


@app.route("/stream")
def stream():
    q = events.subscribe()

    def generate():
        try:
            while True:
                try:
                    data = q.get(timeout=25)
                    yield f"data: {json.dumps(data, ensure_ascii=False)}\n\n"
                except Exception:
                    yield 'data: {"type":"ping"}\n\n'
        finally:
            events.unsubscribe(q)

    return Response(
        stream_with_context(generate()),
        mimetype="text/event-stream",
        headers={"Cache-Control": "no-cache", "X-Accel-Buffering": "no"},
    )


# ── API заявок ─────────────────────────────────────────────────────────────────

@app.route("/api/tasks/search")
def api_tasks_search():
    try:
        number = int(request.args.get("number", 0))
        task = intradesk_api.get_task(number)
        if task is None:
            return jsonify({"error": "Заявка не найдена"}), 404
        return jsonify(task)
    except Exception as e:
        return jsonify({"error": str(e)}), 400


@app.route("/api/tasks/active")
def api_tasks_active():
    filter_expr = request.args.get(
        "filter", "(status ne 68045) and (executorgroup eq 243025)"
    )
    tasks = intradesk_api.get_tasks(filter_expr, top=50)
    return jsonify(tasks)


@app.route("/api/task/lifetime")
def api_task_lifetime():
    try:
        task_id = int(request.args.get("task_id", 0))
        top     = int(request.args.get("top", 20))
        data    = intradesk_api.get_task_lifetime(task_id, top=top)
        return jsonify(data)
    except Exception as e:
        return jsonify({"error": str(e)}), 400


# ── Справочники ────────────────────────────────────────────────────────────────

@app.route("/api/ref/<entity>")
def api_ref(entity):
    items = database.get_all_ref(entity)
    if not items:
        fallback = {"statuses": reference.STATUSES, "priorities": reference.PRIORITIES}
        d = fallback.get(entity, {})
        items = [{"id": k, "name": v} for k, v in d.items()]
    return jsonify(items)


# ── Изменение заявки ───────────────────────────────────────────────────────────

@app.route("/api/task/preview", methods=["POST"])
def api_task_preview():
    data   = request.get_json() or {}
    number = data.get("number")
    blocks = data.get("blocks", {})
    body   = {"number": number, "blocks": blocks, "Channel": "api"}
    return jsonify({
        "method": "PUT",
        "url":    "https://apigw.intradesk.ru/changes/v3/tasks/?ApiKey=***",
        "body":   body,
    })


@app.route("/api/task/execute", methods=["POST"])
def api_task_execute():
    data   = request.get_json() or {}
    number = data.get("number")
    blocks = data.get("blocks", {})
    if not number:
        return jsonify({"success": False, "error": "Не указан номер заявки"}), 400
    success = intradesk_api.update_task(int(number), blocks)
    return jsonify({"success": success})


def start_server():
    ssl_cert = os.path.join("/app/ssl", "cert.pem")
    ssl_key  = os.path.join("/app/ssl", "key.pem")

    if os.path.exists(ssl_cert) and os.path.exists(ssl_key):
        log.info(f"Web server + dashboard → https://0.0.0.0:{config.PORT} (SSL)")
        app.run(host="0.0.0.0", port=config.PORT,
                ssl_context=(ssl_cert, ssl_key), use_reloader=False)
    else:
        log.info(f"Web server + dashboard → http://0.0.0.0:{config.PORT} (no SSL)")
        app.run(host="0.0.0.0", port=config.PORT, use_reloader=False)