from __future__ import annotations

from pathlib import Path

from govoplan_calendar.backend.db import models as calendar_models  # noqa: F401 - populate Calendar ORM metadata
from govoplan_core.core.module_guards import drop_table_retirement_provider, persistent_table_uninstall_guard
from govoplan_core.core.modules import FrontendModule, MigrationSpec, ModuleContext, ModuleManifest, NavItem, PermissionDefinition, RoleTemplate
from govoplan_core.db.base import Base


def _permission(scope: str, label: str, description: str) -> PermissionDefinition:
    module_id, resource, action = scope.split(":", 2)
    return PermissionDefinition(
        scope=scope,
        label=label,
        description=description,
        category="Calendar",
        level="tenant",
        module_id=module_id,
        resource=resource,
        action=action,
    )


PERMISSIONS = (
    _permission("calendar:calendar:read", "View calendars", "List tenant calendar collections and metadata."),
    _permission("calendar:calendar:write", "Manage calendars", "Create and edit tenant calendar collections."),
    _permission("calendar:calendar:admin", "Administer calendars", "Delete calendars and manage tenant-level calendar settings."),
    _permission("calendar:event:read", "View calendar events", "List and inspect calendar events."),
    _permission("calendar:event:write", "Manage calendar events", "Create and edit calendar events."),
    _permission("calendar:event:delete", "Delete calendar events", "Delete or cancel calendar events where policy allows it."),
    _permission("calendar:event:import", "Import iCalendar events", "Import VEVENT data from iCalendar sources."),
    _permission("calendar:event:export", "Export iCalendar events", "Export events as text/calendar VEVENT data."),
    _permission("calendar:availability:read", "Read availability", "Read free/busy and availability data for integrations."),
)

ROLE_TEMPLATES = (
    RoleTemplate(
        slug="calendar_manager",
        name="Calendar manager",
        description="Manage tenant calendars and events.",
        permissions=(
            "calendar:calendar:read",
            "calendar:calendar:write",
            "calendar:event:read",
            "calendar:event:write",
            "calendar:event:delete",
            "calendar:event:import",
            "calendar:event:export",
            "calendar:availability:read",
        ),
    ),
    RoleTemplate(
        slug="calendar_viewer",
        name="Calendar viewer",
        description="Read calendars, events, exports, and availability.",
        permissions=(
            "calendar:calendar:read",
            "calendar:event:read",
            "calendar:event:export",
            "calendar:availability:read",
        ),
    ),
)


def _tenant_summary(session, tenant_id: str) -> dict[str, int]:
    from govoplan_calendar.backend.db.models import CalendarCollection, CalendarEvent, CalendarSyncCredential, CalendarSyncSource

    return {
        "calendars": session.query(CalendarCollection).filter(CalendarCollection.tenant_id == tenant_id, CalendarCollection.deleted_at.is_(None)).count(),
        "calendar_events": session.query(CalendarEvent).filter(CalendarEvent.tenant_id == tenant_id, CalendarEvent.deleted_at.is_(None)).count(),
        "calendar_sync_sources": session.query(CalendarSyncSource).filter(CalendarSyncSource.tenant_id == tenant_id, CalendarSyncSource.deleted_at.is_(None)).count(),
        "calendar_sync_credentials": session.query(CalendarSyncCredential).filter(CalendarSyncCredential.tenant_id == tenant_id, CalendarSyncCredential.deleted_at.is_(None)).count(),
    }


def _calendar_router(context: ModuleContext):
    from govoplan_calendar.backend.runtime import configure_runtime

    configure_runtime(registry=context.registry, settings=context.settings)
    from govoplan_calendar.backend.router import router

    return router


manifest = ModuleManifest(
    id="calendar",
    name="Calendar",
    version="0.1.6",
    dependencies=("access",),
    optional_dependencies=("mail", "tasks", "scheduling", "appointments", "workflow", "notifications", "dms", "connectors"),
    permissions=PERMISSIONS,
    route_factory=_calendar_router,
    role_templates=ROLE_TEMPLATES,
    tenant_summary_providers=(_tenant_summary,),
    nav_items=(NavItem(path="/calendar", label="Calendar", icon="calendar", required_any=("calendar:event:read",), order=55),),
    frontend=FrontendModule(
        module_id="calendar",
        package_name="@govoplan/calendar-webui",
        nav_items=(NavItem(path="/calendar", label="Calendar", icon="calendar", required_any=("calendar:event:read",), order=55),),
    ),
    migration_spec=MigrationSpec(
        module_id="calendar",
        metadata=Base.metadata,
        script_location=str(Path(__file__).with_name("migrations") / "versions"),
        retirement_supported=True,
        retirement_provider=drop_table_retirement_provider(
            calendar_models.CalendarCollection,
            calendar_models.CalendarEvent,
            calendar_models.CalendarSyncCredential,
            calendar_models.CalendarSyncSource,
            label="Calendar",
        ),
        retirement_notes="Destructive retirement drops calendar-owned database tables after the installer captures a database snapshot.",
    ),
    uninstall_guard_providers=(
        persistent_table_uninstall_guard(
            calendar_models.CalendarCollection,
            calendar_models.CalendarEvent,
            calendar_models.CalendarSyncCredential,
            calendar_models.CalendarSyncSource,
            label="Calendar",
        ),
    ),
)


def get_manifest() -> ModuleManifest:
    return manifest