# steward/app.py
from __future__ import annotations
import asyncio
from pathlib import Path
from quart import Quart, render_template
from .config import load_bootstrap
from .database import init_db


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

    # ── 1. Bootstrap: db_url + secret_key only ────────────────────────────────
    if not testing:
        bootstrap = load_bootstrap(config_path)
    else:
        bootstrap = {
            "database_url": "postgresql+asyncpg://test/test",
            "secret_key": "test-secret-key",
            "plugin_dirs": ["plugins"],
            "plugin_install_dir": "plugins",
        }

    app.config.update(
        SECRET_KEY=bootstrap["secret_key"],
        DATABASE_URL=bootstrap["database_url"],
        PLUGIN_DIRS=bootstrap["plugin_dirs"],
        PLUGIN_INSTALL_DIR=bootstrap["plugin_install_dir"],
        TESTING=testing,
    )

    # ── 2. Init DB engine ──────────────────────────────────────────────────────
    if not testing:
        init_db(app)
    else:
        from unittest.mock import MagicMock
        app.db_sessionmaker = MagicMock()

    # ── 3. Core migrations only (creates app_settings table) ──────────────────
    if not testing:
        from .core.migration_runner import run_core_migrations
        run_core_migrations(
            app.config["DATABASE_URL"],
            plugin_dirs=[Path(d).resolve() for d in app.config["PLUGIN_DIRS"]],
        )

    # ── 3b. Encryption-at-rest: bind the encryptor, then encrypt legacy secrets ─
    if not testing:
        from .core.crypto import init_crypto
        from .core.settings import migrate_plaintext_secrets
        init_crypto(app.config["SECRET_KEY"])
        migrate_plaintext_secrets(app.config["DATABASE_URL"])

    # ── 4. Load all settings from DB → populate app.config ────────────────────
    if not testing:
        from .core.settings import (
            load_settings_sync, to_smtp_cfg, to_webhook_cfg,
            to_ansible_cfg, to_plugins_cfg, to_oidc_cfg, to_ldap_cfg,
            to_thresholds_cfg,
        )
        _settings = load_settings_sync(app.config["DATABASE_URL"])
        app.config.update(
            SESSION_LIFETIME_HOURS=_settings.get("session.lifetime_hours", 8),
            DATA_RETENTION_DAYS=_settings.get("data.retention_days", 90),
            MONITORS_POLL_INTERVAL=_settings.get("monitors.poll_interval_seconds", 60),
            SMTP=to_smtp_cfg(_settings),
            WEBHOOK=to_webhook_cfg(_settings),
            ANSIBLE=to_ansible_cfg(_settings),
            PLUGINS=to_plugins_cfg(_settings),
            OIDC=to_oidc_cfg(_settings),
            LDAP=to_ldap_cfg(_settings),
            THRESHOLDS=to_thresholds_cfg(_settings),
        )
    else:
        from .core.settings import to_thresholds_cfg
        app.config.update(
            SESSION_LIFETIME_HOURS=8,
            DATA_RETENTION_DAYS=90,
            MONITORS_POLL_INTERVAL=60,
            SMTP={},
            WEBHOOK={},
            ANSIBLE={},
            PLUGINS={},
            OIDC={"enabled": False},
            LDAP={"enabled": False},
            THRESHOLDS=to_thresholds_cfg({}),
        )

    # `threshold_style(value, kind)` — degraded-value coloring for templates,
    # reading the configurable cutoffs from app.config["THRESHOLDS"]. Available
    # in every template (core + plugin) via the jinja global.
    from .core.settings import threshold_style_for as _ts_for
    app.jinja_env.globals["threshold_style"] = (
        lambda value, kind: _ts_for(value, kind, app.config.get("THRESHOLDS", {}))
    )

    # ── 5. Plugin migrations ───────────────────────────────────────────────────
    # Step 3 already applied all plugin migrations via discover_all_plugin_migration_dirs,
    # so this is a no-op on normal startup. We still run it with all discovered dirs so
    # Alembic can resolve the full revision graph regardless of which plugins are enabled.
    if not testing:
        from .core.migration_runner import run_plugin_migrations, discover_all_in
        _plugin_dirs = [Path(d).resolve() for d in app.config["PLUGIN_DIRS"]]
        _all_plugin_dirs = discover_all_in(_plugin_dirs)
        run_plugin_migrations(app.config["DATABASE_URL"], _all_plugin_dirs)

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

    # ── 7. Register core blueprints ────────────────────────────────────────────
    from .auth.routes import auth_bp
    from .dashboard.routes import dashboard_bp
    from .hosts.routes import hosts_bp
    from .monitors.routes import monitors_bp
    from .status.routes import status_bp
    from .alerts.routes import alerts_bp
    from .ansible.routes import ansible_bp
    from .ansible.inventory_routes import inventory_bp
    from .settings.routes import settings_bp
    from .audit.routes import audit_bp

    app.register_blueprint(auth_bp)
    app.register_blueprint(dashboard_bp)
    app.register_blueprint(hosts_bp)
    app.register_blueprint(monitors_bp)
    app.register_blueprint(status_bp)
    app.register_blueprint(alerts_bp)
    app.register_blueprint(ansible_bp)
    app.register_blueprint(inventory_bp)
    app.register_blueprint(settings_bp)
    app.register_blueprint(audit_bp)

    # Register the unified Monitor status source for the Status page. Plugins
    # may register additional sources from setup(). Idempotent.
    from .core.status import register_status_source, monitor_status_source
    register_status_source(monitor_status_source)

    # Publish the Ansible "run a playbook" capability so plugins (e.g. host_agent
    # auto-deploy) can drive runs without importing the runner. Ansible is core,
    # so this is always available; consumers still gate on has_capability().
    from .core.capabilities import register_capability
    from .ansible.runner import trigger_run
    from .models.users import UserRole as _UserRole
    register_capability(
        "ansible.run_playbook", trigger_run,
        label="Run Ansible playbook",
        description="Launch an Ansible playbook run (manual, alert, schedule, or plugin-driven).",
        required_role=_UserRole.operator,
    )

    # ── 8. Build task registry ─────────────────────────────────────────────────
    app._task_registry = []

    if not testing:
        _register_core_tasks(app)

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

    # ── 10. Template context: inject plugin_failures into every response ───────
    @app.context_processor
    def _inject_plugin_failures():
        from .core.plugin_manager import get_plugin_failures
        # enabled_plugins lets templates gate cross-plugin embeds (e.g. the
        # Hosts hub only fetches the docker fragment when docker is enabled),
        # avoiding a 404 to a route whose blueprint isn't registered.
        enabled_plugins = {
            name for name, cfg in (app.config.get("PLUGINS") or {}).items()
            if isinstance(cfg, dict) and cfg.get("enabled")
        }
        return {
            "plugin_failures": get_plugin_failures(),
            "enabled_plugins": enabled_plugins,
        }

    # ── 11. Share-token middleware ─────────────────────────────────────────────
    @app.before_request
    async def _validate_share_token():
        """If ?s=<token> is present, validate it and set g.share_viewer."""
        from quart import request, g
        raw = request.args.get("s")
        if not raw:
            return
        try:
            import hashlib
            from datetime import datetime, timezone
            from sqlalchemy import select
            from .models.dashboard import DashboardShareToken
            token_hash = hashlib.sha256(raw.encode()).hexdigest()
            async with app.db_sessionmaker() as db:
                result = await db.execute(
                    select(DashboardShareToken)
                    .where(DashboardShareToken.token_hash == token_hash)
                )
                share = result.scalar_one_or_none()
            if share:
                now = datetime.now(timezone.utc)
                if share.expires_at is None or share.expires_at > now:
                    g.share_viewer = True
                    g.share_dashboard_id = share.dashboard_id
        except Exception:
            pass  # never block a request due to token validation failure

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

    # ── 12. Error handlers ─────────────────────────────────────────────────────
    @app.errorhandler(404)
    async def not_found(_):
        return await render_template("errors/404.html"), 404

    @app.errorhandler(500)
    async def server_error(_):
        return await render_template("errors/500.html"), 500

    # ── 11. Startup hook ───────────────────────────────────────────────────────
    @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) -> None:
    from .core.scheduler import ScheduledTask

    poll_interval = app.config.get("MONITORS_POLL_INTERVAL", 60)
    cleanup_interval = 3600  # hourly

    async def run_monitor_checks():
        from .monitors.scheduler import run_due_monitors
        await run_due_monitors(app)

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

    async def run_report_check():
        from .core.reports import check_and_send
        await check_and_send(app)

    app._task_registry.extend([
        ScheduledTask(
            name="weekly_report_check",
            coro_factory=run_report_check,
            interval_seconds=3600,
            run_on_startup=False,
        ),
        ScheduledTask(
            name="monitor_check",
            coro_factory=run_monitor_checks,
            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 ansible git source
    ansible_cfg = app.config.get("ANSIBLE", {})
    from .ansible.sources import get_sources
    for source in get_sources(ansible_cfg):
        if source["type"] != "git":
            continue
        _source = source

        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,
            )
        )

    # Fire due Ansible schedules (recurring playbook runs). Checks every minute;
    # each schedule's own interval gates whether it actually runs.
    async def run_ansible_schedules():
        from .ansible.scheduler import run_due_schedules
        await run_due_schedules(app)

    app._task_registry.append(
        ScheduledTask(
            name="ansible_scheduled_runs",
            coro_factory=run_ansible_schedules,
            interval_seconds=60,
            run_on_startup=False,
        )
    )


async def _mark_interrupted_runs(app: Quart) -> None:
    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.in_(
                    [AnsibleRunStatus.running, AnsibleRunStatus.queued]))
                .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)