from __future__ import annotations
import asyncio
from pathlib import Path
from quart import Quart
from .config import load_config
from .database import init_db


def create_app(
    config_path: Path | str | None = None,
    testing: bool = False,
) -> Quart:
    app = Quart(__name__, template_folder="templates")

    # Load config
    cfg = load_config(config_path)
    app.config.update(
        SECRET_KEY=cfg["secret_key"],
        DATABASE_URL=cfg["database"]["url"],
        SESSION_LIFETIME_HOURS=cfg.get("session", {}).get("lifetime_hours", 8),
        DATA_RETENTION_DAYS=cfg.get("data", {}).get("retention_days", 90),
        PLUGIN_DIR=cfg.get("plugin_dir", "plugins"),
        PLUGINS=cfg.get("plugins", {}),
        SMTP=cfg.get("smtp", {}),
        WEBHOOK=cfg.get("webhook", {}),
        ANSIBLE=cfg.get("ansible", {}),
        TESTING=testing,
        _RAW_CFG=cfg,
    )

    # Database
    if not testing:
        init_db(app)
    else:
        from unittest.mock import MagicMock
        app.db_sessionmaker = MagicMock()

    # Run migrations (core + plugin) synchronously before event loop starts
    if not testing:
        from .core.migration_runner import run_migrations, get_plugin_migration_dirs
        _plugin_dir = Path(app.config["PLUGIN_DIR"])
        _plugin_migration_dirs = get_plugin_migration_dirs(
            _plugin_dir, app.config["PLUGINS"]
        )
        run_migrations(app.config["DATABASE_URL"], _plugin_migration_dirs)

    # Alert pipeline
    from .core.alerts import init_alerts
    init_alerts(app)

    # Register core blueprints
    from .auth.routes import auth_bp
    from .dashboard.routes import dashboard_bp
    from .hosts.routes import hosts_bp
    from .alerts.routes import alerts_bp
    from .ansible.routes import ansible_bp

    app.register_blueprint(auth_bp)
    app.register_blueprint(dashboard_bp)
    app.register_blueprint(hosts_bp)
    app.register_blueprint(alerts_bp)
    app.register_blueprint(ansible_bp)

    # Build task registry
    app._task_registry = []

    if not testing:
        _register_core_tasks(app, cfg)

    # Load plugins
    if not testing:
        from .core.plugin_manager import load_plugins
        load_plugins(app)

    # Health check
    @app.get("/health")
    async def health():
        return {"status": "ok"}

    # Start scheduler on first request
    @app.before_serving
    async def startup():
        if not testing:
            await _mark_interrupted_runs(app)
            asyncio.create_task(_run_scheduler(app))

    return app


def _register_core_tasks(app: Quart, cfg: dict) -> None:
    from .core.scheduler import ScheduledTask

    poll_interval = cfg.get("monitors", {}).get("poll_interval_seconds", 60)
    cleanup_interval = 3600  # hourly

    async def run_ping_monitors():
        from sqlalchemy import select
        from .models.hosts import Host
        from .monitors.ping import ping_check
        async with app.db_sessionmaker() as session:
            async with session.begin():
                result = await session.execute(
                    select(Host).where(Host.ping_enabled.is_(True))
                )
                for host in result.scalars().all():
                    try:
                        await ping_check(host, session)
                    except Exception:
                        app.logger.exception(f"Ping check failed for host {host.name!r}")

    async def run_dns_monitors():
        from sqlalchemy import select
        from .models.hosts import Host
        from .monitors.dns import dns_check
        async with app.db_sessionmaker() as session:
            async with session.begin():
                result = await session.execute(
                    select(Host).where(Host.dns_enabled.is_(True))
                )
                for host in result.scalars().all():
                    try:
                        await dns_check(host, session)
                    except Exception:
                        app.logger.exception(f"DNS check failed for host {host.name!r}")

    async def run_cleanup():
        from .core.cleanup import run_cleanup as _cleanup
        await _cleanup(app)

    app._task_registry.extend([
        ScheduledTask(
            name="ping_monitor",
            coro_factory=run_ping_monitors,
            interval_seconds=poll_interval,
            run_on_startup=True,
        ),
        ScheduledTask(
            name="dns_monitor",
            coro_factory=run_dns_monitors,
            interval_seconds=poll_interval,
            run_on_startup=True,
        ),
        ScheduledTask(
            name="data_cleanup",
            coro_factory=run_cleanup,
            interval_seconds=cleanup_interval,
            run_on_startup=False,
        ),
    ])

    # Register git-pull tasks for each git source
    ansible_cfg = cfg.get("ansible", {})
    from .ansible.sources import get_sources
    for source in get_sources(ansible_cfg):
        if source["type"] != "git":
            continue
        _source = source  # capture for closure

        async def run_git_pull(src=_source):
            from .ansible.sources import git_pull
            await git_pull(src)

        app._task_registry.append(
            ScheduledTask(
                name=f"ansible_git_pull_{_source['name']}",
                coro_factory=run_git_pull,
                interval_seconds=_source["pull_interval_seconds"],
                run_on_startup=True,
            )
        )


async def _mark_interrupted_runs(app: Quart) -> None:
    """Mark any runs still in 'running' state as 'interrupted' (process restart)."""
    from sqlalchemy import update
    from .models.ansible import AnsibleRun, AnsibleRunStatus
    from datetime import datetime, timezone

    async with app.db_sessionmaker() as session:
        async with session.begin():
            await session.execute(
                update(AnsibleRun)
                .where(AnsibleRun.status == AnsibleRunStatus.running)
                .values(
                    status=AnsibleRunStatus.interrupted,
                    finished_at=datetime.now(timezone.utc),
                )
            )


async def _run_scheduler(app: Quart) -> None:
    from .core.scheduler import start_scheduler
    await start_scheduler(app._task_registry)