"""superadmin/routers/platform.py — Platform-wide operations.

Routes:
  GET  /
  GET  /diag
  GET  /health
  GET  /audit
  POST /announce
  POST /backup
"""

from fastapi import APIRouter, Depends, Query
from sqlalchemy.ext.asyncio import AsyncSession

from app.dependencies import check_health, get_db, get_current_superadmin
from app.repositories.audit_repo import AuditRepository
from app.schemas.admin import AnnouncementRequest
from app.superadmin.routers._utils import _err

router = APIRouter()


@router.get("/")
async def superadmin_index():
    """SuperAdmin API index — lists available endpoints."""
    return {
        "message": "SuperAdmin API. Requires SuperAdmin JWT (Bearer token).",
        "endpoints": {
            "list_authors": "GET /api/super/authors",
            "create_author": "POST /api/super/authors",
            "suspend_author": "POST /api/super/authors/{id}/suspend",
            "grant_access": "POST /api/super/authors/{id}/grant",
            "revoke_access": "POST /api/super/grants/{id}/revoke",
            "audit_log": "GET /api/super/audit",
            "platform_health": "GET /api/super/health",
        },
        "docs": "/docs",
    }


@router.get("/diag")
async def diagnostic(superadmin=Depends(get_current_superadmin)):
    """R-045: Diagnostic endpoint — requires SuperAdmin auth."""
    return {"status": "ok", "router": "superadmin", "auth": "verified"}


@router.get("/health")
async def platform_health(superadmin=Depends(get_current_superadmin)):
    """Platform health: Redis, ChromaDB, DB status."""
    try:
        return await check_health()
    except Exception as e:
        return _err(e, "platform_health")


@router.get("/audit")
async def get_audit_log(
    limit: int = Query(100, ge=1, le=500),
    cursor: str | None = Query(None),
    actor_id: str | None = Query(None),
    action: str | None = Query(None),
    superadmin=Depends(get_current_superadmin),
    db: AsyncSession = Depends(get_db),
):
    """Retrieve the immutable audit log. No DELETE allowed."""
    try:
        audit_repo = AuditRepository(db)
        entries = await audit_repo.list_recent(
            limit=limit, cursor=cursor, actor_id=actor_id, action=action
        )
        result = [
            {
                "id": e.id,
                "timestamp": e.timestamp.isoformat() if e.timestamp else None,
                "actor_email": e.actor_email,
                "action": e.action,
                "target_type": e.target_type,
                "target_id": e.target_id,
                "details": e.details,
            }
            for e in entries
        ]
        return {"entries": result, "count": len(result)}
    except Exception as e:
        return _err(e, "get_audit_log")


@router.post("/announce", status_code=201)
async def broadcast_announcement(
    body: AnnouncementRequest,
    superadmin=Depends(get_current_superadmin),
    db: AsyncSession = Depends(get_db),
):
    """Broadcast an announcement visible to all authors. R-029: Validated via Pydantic schema."""
    try:
        audit_repo = AuditRepository(db)
        await audit_repo.log(
            actor_id=superadmin.id,
            actor_email=superadmin.email,
            action="broadcast_announcement",
            target_type="platform",
            target_id=None,
            details={"message": body.message},
        )
        return {"message": "Announcement sent"}
    except Exception as e:
        return _err(e, "broadcast_announcement")


@router.post("/backup", status_code=202)
async def trigger_backup(
    superadmin=Depends(get_current_superadmin),
    db: AsyncSession = Depends(get_db),
):
    """Dispatch backup to Celery worker (R-080 — non-blocking)."""
    try:
        from app.tasks.backup_task import run_backup

        task = run_backup.delay()
        audit_repo = AuditRepository(db)
        await audit_repo.log(
            actor_id=superadmin.id,
            actor_email=superadmin.email,
            action="trigger_backup",
            target_type="platform",
            target_id=None,
            details={"task_id": task.id},
        )
        return {"message": "Backup dispatched", "task_id": task.id}
    except Exception as e:
        return _err(e, "trigger_backup")