"""
app/admin/__init__.py — Admin app factory (admin.mydomain.com).
"""

import logging
from datetime import timedelta
from flask import Flask
from app.extensions import db, migrate, csrf, mail, scheduler, admin_login_manager, admin_jwt, limiter
from app.security import apply_security_headers, check_admin_ip
from config import get_config

logger = logging.getLogger(__name__)


def create_admin_app(config_override=None):
    flask_app = Flask(
        __name__,
        template_folder="../templates",
        static_folder="../static",
        static_url_path="/static/admin",
    )

    # ── Config ────────────────────────────────────────────────
    cfg = config_override or get_config()
    flask_app.config.from_object(cfg)

    # Admin portal uses a separate secret key and session cookie name
    import os
    flask_app.config["SECRET_KEY"] = os.environ.get(
        "ADMIN_SECRET_KEY", flask_app.config["SECRET_KEY"]
    )
    flask_app.config["SESSION_COOKIE_NAME"] = "salon_pos_admin_session"
    flask_app.config["PERMANENT_SESSION_LIFETIME"] = timedelta(
        seconds=int(os.environ.get("SESSION_TIMEOUT_ADMIN", 3600))
    )
    flask_app.config["SESSION_COOKIE_HTTPONLY"] = True
    flask_app.config["SESSION_COOKIE_SAMESITE"] = "Lax"

    # ── Extensions ────────────────────────────────────────────
    db.init_app(flask_app)
    migrate.init_app(flask_app, db)
    csrf.init_app(flask_app)
    mail.init_app(flask_app)
    limiter.init_app(flask_app)

    # Admin login manager
    admin_login_manager.login_view = "admin_auth.login"
    admin_login_manager.login_message_category = "warning"
    admin_login_manager.session_protection = "strong"
    admin_login_manager.init_app(flask_app)

    # Admin JWT
    admin_jwt.init_app(flask_app)

    # ── User loader ───────────────────────────────────────────
    from app.models.platform import SystemUser

    @admin_login_manager.user_loader
    def load_admin_user(user_id: str):
        if not user_id.startswith("system:"):
            return None
        try:
            uid = int(user_id.split(":")[1])
        except (ValueError, IndexError):
            return None
        return SystemUser.query.get(uid)

    # ── Security ──────────────────────────────────────────────
    apply_security_headers(flask_app)
    check_admin_ip(flask_app)

    # ── Blueprints ────────────────────────────────────────────
    from app.admin.auth.routes import admin_auth_bp
    flask_app.register_blueprint(admin_auth_bp)

    # Placeholder blueprints registered in later phases:
    # system_users, tenants, plans, billing, settings_override, audit_log, analytics

    # ── Import all models for Migrate ─────────────────────────
    import app.models  # noqa: F401

    logger.info("Admin app created (env=%s)", flask_app.config.get("FLASK_ENV"))
    return flask_app