"""
Tenant CRUD-endpoints för LandveX Admin Backend.
Inkluderar audit-logging, validering, felhantering och schema-isolering.
"""
from typing import Optional, Dict, Any
from uuid import UUID

from fastapi import APIRouter, Depends, Request, HTTPException, status, Query

from app.database import get_db
from app.dependencies import get_current_user, require_admin
from app.schemas import (
    TenantCreate, TenantUpdate, TenantOut, TenantDetailOut,
    TenantListOut, TenantListParams, TenantStatusUpdate,
    TenantActivateRequest, TenantSuspendRequest, TenantStats,
    SuccessResponse, AuditLogListOut
)
from app.services.tenant_service import TenantService
from app.services.audit_service import AuditService
from app.models import User

router = APIRouter(prefix="/tenants", tags=["Tenants"])


def _request_context(request: Request, current_user: User) -> Dict[str, Any]:
    """Bygg request context för audit-logging."""
    return {
        "request_id": request.headers.get("X-Request-ID", ""),
        "request_method": request.method,
        "request_path": str(request.url.path),
        "actor_ip": request.client.host if request.client else None,
        "actor_user_agent": request.headers.get("user-agent", ""),
    }


# ─── LIST ─────────────────────────────────────────────────────────────────────

@router.get("", response_model=TenantListOut)
async def list_tenants(
    request: Request,
    page: int = Query(1, ge=1),
    page_size: int = Query(20, ge=1, le=100),
    status: Optional[str] = Query(None),
    tenant_type: Optional[str] = Query(None),
    search: Optional[str] = Query(None, max_length=100),
    country: Optional[str] = Query(None, max_length=2),
    city: Optional[str] = Query(None, max_length=100),
    sort_by: str = Query("created_at"),
    sort_order: str = Query("desc", pattern=r"^(asc|desc)$"),
    is_active: Optional[bool] = Query(None),
    current_user: User = Depends(require_admin),
    db=Depends(get_db),
):
    """Lista alla tenants med paginering, filtrering och sortering."""
    from app.models import TenantStatus as TS, TenantType as TT

    params = TenantListParams(
        page=page, page_size=page_size,
        sort_by=sort_by, sort_order=sort_order,
        search=search, country=country, city=city,
        is_active=is_active
    )

    if status:
        try:
            params.status = TS(status)
        except ValueError:
            raise HTTPException(status_code=400, detail=f"Invalid status: {status}")

    if tenant_type:
        try:
            params.tenant_type = TT(tenant_type)
        except ValueError:
            raise HTTPException(status_code=400, detail=f"Invalid tenant_type: {tenant_type}")

    service = TenantService(db)
    tenants, total = await service.list_tenants(params)
    pages = (total + page_size - 1) // page_size

    return TenantListOut(
        items=[TenantOut.model_validate(t.to_dict()) for t in tenants],
        total=total, page=page, page_size=page_size, pages=pages
    )


# ─── STATS ────────────────────────────────────────────────────────────────────

@router.get("/stats", response_model=TenantStats)
async def get_tenant_stats(
    current_user: User = Depends(require_admin),
    db=Depends(get_db),
):
    """Hämta aggregerad statistik om alla tenants."""
    service = TenantService(db)
    stats = await service.get_statistics()
    return TenantStats.model_validate(stats)


# ─── GET ONE ──────────────────────────────────────────────────────────────────

@router.get("/{tenant_id}", response_model=TenantDetailOut)
async def get_tenant(
    tenant_id: UUID,
    current_user: User = Depends(get_current_user),
    db=Depends(get_db),
):
    """Hämta en tenant med ID. Admin ser allt, andra bara sin egen."""
    service = TenantService(db)
    tenant = await service.get_by_id(tenant_id)
    if tenant is None:
        raise HTTPException(status_code=404, detail="Tenant not found")

    user_role = current_user.role.value if hasattr(current_user.role, 'value') else str(current_user.role)
    user_tenant = str(current_user.tenant_id) if current_user.tenant_id else None

    if user_role != "admin" and user_tenant != str(tenant_id):
        raise HTTPException(status_code=403, detail="Access denied for this tenant")

    include_sensitive = user_role == "admin"
    return tenant.to_dict(include_sensitive=include_sensitive)


# ─── CREATE ───────────────────────────────────────────────────────────────────

@router.post("", response_model=TenantDetailOut, status_code=status.HTTP_201_CREATED)
async def create_tenant(
    request: Request,
    data: TenantCreate,
    current_user: User = Depends(require_admin),
    db=Depends(get_db),
):
    """Skapa en ny tenant (kommun eller företag)."""
    service = TenantService(db)
    tenant = await service.create_tenant(
        data=data,
        actor_id=str(current_user.id),
        request_context=_request_context(request, current_user)
    )
    return tenant.to_dict(include_sensitive=True)


# ─── UPDATE ───────────────────────────────────────────────────────────────────

@router.patch("/{tenant_id}", response_model=TenantDetailOut)
async def update_tenant(
    request: Request,
    tenant_id: UUID,
    data: TenantUpdate,
    current_user: User = Depends(get_current_user),
    db=Depends(get_db),
):
    """Uppdatera en tenant. Endast angivna fält uppdateras."""
    user_role = current_user.role.value if hasattr(current_user.role, 'value') else str(current_user.role)
    user_tenant = str(current_user.tenant_id) if current_user.tenant_id else None

    if user_role != "admin" and user_tenant != str(tenant_id):
        raise HTTPException(status_code=403, detail="Access denied for this tenant")

    service = TenantService(db)
    tenant = await service.update_tenant(
        tenant_id=tenant_id,
        data=data,
        actor_id=str(current_user.id),
        request_context=_request_context(request, current_user)
    )
    include_sensitive = user_role == "admin"
    return tenant.to_dict(include_sensitive=include_sensitive)


# ─── DELETE (soft) ────────────────────────────────────────────────────────────

@router.delete("/{tenant_id}", response_model=SuccessResponse)
async def delete_tenant(
    request: Request,
    tenant_id: UUID,
    current_user: User = Depends(require_admin),
    db=Depends(get_db),
):
    """Mjuk-radera en tenant. Datat bevaras men markeras som borttaget."""
    service = TenantService(db)
    tenant = await service.delete_tenant(
        tenant_id=tenant_id,
        actor_id=str(current_user.id),
        request_context=_request_context(request, current_user)
    )
    return SuccessResponse(
        message=f"Tenant '{tenant.name}' has been deleted",
        data={"tenant_id": str(tenant.id), "deleted_at": tenant.deleted_at.isoformat() if tenant.deleted_at else None}
    )


# ─── HARD DELETE ──────────────────────────────────────────────────────────────

@router.delete("/{tenant_id}/hard", response_model=SuccessResponse)
async def hard_delete_tenant(
    request: Request,
    tenant_id: UUID,
    current_user: User = Depends(require_admin),
    db=Depends(get_db),
):
    """Permanent borttagning av en tenant. Åtgärden kan INTE ångras!"""
    service = TenantService(db)
    await service.hard_delete_tenant(
        tenant_id=tenant_id,
        actor_id=str(current_user.id),
        request_context=_request_context(request, current_user)
    )
    return SuccessResponse(message=f"Tenant {tenant_id} has been permanently deleted")


# ─── ACTIVATE ─────────────────────────────────────────────────────────────────

@router.post("/{tenant_id}/activate", response_model=TenantDetailOut)
async def activate_tenant(
    request: Request,
    tenant_id: UUID,
    data: TenantActivateRequest = TenantActivateRequest(),
    current_user: User = Depends(require_admin),
    db=Depends(get_db),
):
    """Aktivera en tenant (PENDING/TRIAL → ACTIVE)."""
    service = TenantService(db)
    tenant = await service.activate_tenant(
        tenant_id=tenant_id,
        data=data,
        actor_id=str(current_user.id),
        request_context=_request_context(request, current_user)
    )
    return tenant.to_dict(include_sensitive=True)


# ─── SUSPEND ──────────────────────────────────────────────────────────────────

@router.post("/{tenant_id}/suspend", response_model=TenantDetailOut)
async def suspend_tenant(
    request: Request,
    tenant_id: UUID,
    data: TenantSuspendRequest,
    current_user: User = Depends(require_admin),
    db=Depends(get_db),
):
    """Suspendera en tenant tillfälligt. Kan återaktiveras senare."""
    service = TenantService(db)
    tenant = await service.suspend_tenant(
        tenant_id=tenant_id,
        data=data,
        actor_id=str(current_user.id),
        request_context=_request_context(request, current_user)
    )
    return tenant.to_dict(include_sensitive=True)


# ─── CANCEL ───────────────────────────────────────────────────────────────────

@router.post("/{tenant_id}/cancel", response_model=TenantDetailOut)
async def cancel_tenant(
    request: Request,
    tenant_id: UUID,
    reason: Optional[str] = None,
    current_user: User = Depends(require_admin),
    db=Depends(get_db),
):
    """Avsluta en tenant-prenumeration. Typiskt oåterkallbart."""
    service = TenantService(db)
    tenant = await service.cancel_tenant(
        tenant_id=tenant_id,
        reason=reason,
        actor_id=str(current_user.id),
        request_context=_request_context(request, current_user)
    )
    return tenant.to_dict(include_sensitive=True)


# ─── AUDIT LOGS ───────────────────────────────────────────────────────────────

@router.get("/{tenant_id}/audit-logs", response_model=AuditLogListOut)
async def get_tenant_audit_logs(
    tenant_id: UUID,
    limit: int = Query(50, ge=1, le=200),
    offset: int = Query(0, ge=0),
    current_user: User = Depends(require_admin),
    db=Depends(get_db),
):
    """Hämta audit-loggar för en specifik tenant."""
    audit_service = AuditService(db)
    logs, total = await audit_service.get_by_tenant(
        tenant_id=str(tenant_id), limit=limit, offset=offset
    )
    return AuditLogListOut(
        items=[log.to_dict() for log in logs],
        total=total, limit=limit, offset=offset
    )