"""
E-Mail-Template Routes — Benachrichtigungsvorlagen fuer DSGVO-Compliance.

Verwaltet Templates fuer DSR, Consent, Breach, Vendor und Training E-Mails.
Inklusive Versionierung, Approval-Workflow, Vorschau und Send-Logging.

Phase 1 Step 4 refactor: handlers delegate to EmailTemplateService
(templates/settings/logs/stats/initialize) and EmailTemplateVersionService
(version workflow + preview + test-send). Template types catalog is
re-exported for any legacy callers.
"""

from typing import Any, Optional

from fastapi import APIRouter, Depends, Header, Query
from sqlalchemy.orm import Session

from classroom_engine.database import get_db
from compliance.api._http_errors import translate_domain_errors
from compliance.schemas.email_template import (
    PreviewRequest,
    SendTestRequest,
    SettingsUpdate,
    TemplateCreate,
    VersionCreate,
    VersionUpdate,
)
from compliance.services.email_template_service import (
    TEMPLATE_TYPES,
    VALID_CATEGORIES,
    VALID_STATUSES,
    EmailTemplateService,
)
from compliance.services.email_template_version_service import (
    EmailTemplateVersionService,
)

router = APIRouter(prefix="/email-templates", tags=["compliance-email-templates"])

DEFAULT_TENANT = "9282a473-5c95-4b3a-bf78-0ecc0ec71d3e"


def _get_tenant(x_tenant_id: Optional[str] = Header(None, alias="X-Tenant-ID")) -> str:
    return x_tenant_id or DEFAULT_TENANT


def get_template_service(db: Session = Depends(get_db)) -> EmailTemplateService:
    return EmailTemplateService(db)


def get_version_service(db: Session = Depends(get_db)) -> EmailTemplateVersionService:
    return EmailTemplateVersionService(db)


# =============================================================================
# Template Type Info (MUST be before parameterized routes)
# =============================================================================

@router.get("/types")
async def get_template_types() -> list[dict[str, Any]]:
    """Gibt alle verfuegbaren Template-Typen mit Variablen zurueck."""
    return EmailTemplateService.list_types()


@router.get("/stats")
async def get_stats(
    tenant_id: str = Depends(_get_tenant),
    service: EmailTemplateService = Depends(get_template_service),
) -> dict[str, Any]:
    """Statistiken ueber E-Mail-Templates."""
    with translate_domain_errors():
        return service.stats(tenant_id)


@router.get("/settings")
async def get_settings(
    tenant_id: str = Depends(_get_tenant),
    service: EmailTemplateService = Depends(get_template_service),
) -> dict[str, Any]:
    """Globale E-Mail-Einstellungen laden."""
    with translate_domain_errors():
        return service.get_settings(tenant_id)


@router.put("/settings")
async def update_settings(
    body: SettingsUpdate,
    tenant_id: str = Depends(_get_tenant),
    service: EmailTemplateService = Depends(get_template_service),
) -> dict[str, Any]:
    """Globale E-Mail-Einstellungen speichern."""
    with translate_domain_errors():
        return service.update_settings(tenant_id, body)


@router.get("/logs")
async def get_send_logs(
    limit: int = Query(20, ge=1, le=100),
    offset: int = Query(0, ge=0),
    template_type: Optional[str] = Query(None),
    tenant_id: str = Depends(_get_tenant),
    service: EmailTemplateService = Depends(get_template_service),
) -> dict[str, Any]:
    """Send-Logs (paginiert)."""
    with translate_domain_errors():
        return service.send_logs(tenant_id, limit, offset, template_type)


@router.post("/initialize")
async def initialize_defaults(
    tenant_id: str = Depends(_get_tenant),
    service: EmailTemplateService = Depends(get_template_service),
) -> dict[str, Any]:
    """Default-Templates fuer einen Tenant initialisieren."""
    with translate_domain_errors():
        return service.initialize_defaults(tenant_id)


@router.get("/default/{template_type}")
async def get_default_content(template_type: str) -> dict[str, Any]:
    """Default-Content fuer einen Template-Typ."""
    with translate_domain_errors():
        return EmailTemplateService.default_content(template_type)


# =============================================================================
# Template CRUD
# =============================================================================

@router.get("")
async def list_templates(
    category: Optional[str] = Query(None),
    tenant_id: str = Depends(_get_tenant),
    service: EmailTemplateService = Depends(get_template_service),
) -> list[dict[str, Any]]:
    """Alle Templates mit letzter publizierter Version."""
    with translate_domain_errors():
        return service.list_templates(tenant_id, category)


@router.post("")
async def create_template(
    body: TemplateCreate,
    tenant_id: str = Depends(_get_tenant),
    service: EmailTemplateService = Depends(get_template_service),
) -> dict[str, Any]:
    """Template erstellen."""
    with translate_domain_errors():
        return service.create_template(tenant_id, body)


# =============================================================================
# Version Management (static path before parameterized)
# =============================================================================

@router.post("/versions")
async def create_version(
    body: VersionCreate,
    template_id: str = Query(..., alias="template_id"),
    tenant_id: str = Depends(_get_tenant),
    service: EmailTemplateVersionService = Depends(get_version_service),
) -> dict[str, Any]:
    """Neue Version erstellen (via query param template_id)."""
    with translate_domain_errors():
        return service.create_version(tenant_id, template_id, body)


# =============================================================================
# Single Template (parameterized — after all static paths)
# =============================================================================

@router.get("/{template_id}")
async def get_template(
    template_id: str,
    tenant_id: str = Depends(_get_tenant),
    service: EmailTemplateService = Depends(get_template_service),
) -> dict[str, Any]:
    """Template-Detail."""
    with translate_domain_errors():
        return service.get_template(tenant_id, template_id)


@router.get("/{template_id}/versions")
async def get_versions(
    template_id: str,
    tenant_id: str = Depends(_get_tenant),
    service: EmailTemplateVersionService = Depends(get_version_service),
) -> list[dict[str, Any]]:
    """Versionen eines Templates."""
    with translate_domain_errors():
        return service.list_versions(tenant_id, template_id)


@router.post("/{template_id}/versions")
async def create_version_for_template(
    template_id: str,
    body: VersionCreate,
    tenant_id: str = Depends(_get_tenant),
    service: EmailTemplateVersionService = Depends(get_version_service),
) -> dict[str, Any]:
    """Neue Version fuer ein Template erstellen."""
    with translate_domain_errors():
        return service.create_version(tenant_id, template_id, body)


# =============================================================================
# Version Workflow (parameterized by version_id)
# =============================================================================

@router.get("/versions/{version_id}")
async def get_version(
    version_id: str,
    service: EmailTemplateVersionService = Depends(get_version_service),
) -> dict[str, Any]:
    """Version-Detail."""
    with translate_domain_errors():
        return service.get_version(version_id)


@router.put("/versions/{version_id}")
async def update_version(
    version_id: str,
    body: VersionUpdate,
    service: EmailTemplateVersionService = Depends(get_version_service),
) -> dict[str, Any]:
    """Draft aktualisieren."""
    with translate_domain_errors():
        return service.update_version(version_id, body)


@router.post("/versions/{version_id}/submit")
async def submit_version(
    version_id: str,
    service: EmailTemplateVersionService = Depends(get_version_service),
) -> dict[str, Any]:
    """Zur Pruefung einreichen."""
    with translate_domain_errors():
        return service.submit(version_id)


@router.post("/versions/{version_id}/approve")
async def approve_version(
    version_id: str,
    comment: Optional[str] = None,
    service: EmailTemplateVersionService = Depends(get_version_service),
) -> dict[str, Any]:
    """Genehmigen."""
    with translate_domain_errors():
        return service.approve(version_id, comment)


@router.post("/versions/{version_id}/reject")
async def reject_version(
    version_id: str,
    comment: Optional[str] = None,
    service: EmailTemplateVersionService = Depends(get_version_service),
) -> dict[str, Any]:
    """Ablehnen."""
    with translate_domain_errors():
        return service.reject(version_id, comment)


@router.post("/versions/{version_id}/publish")
async def publish_version(
    version_id: str,
    service: EmailTemplateVersionService = Depends(get_version_service),
) -> dict[str, Any]:
    """Publizieren."""
    with translate_domain_errors():
        return service.publish(version_id)


@router.post("/versions/{version_id}/preview")
async def preview_version(
    version_id: str,
    body: PreviewRequest,
    service: EmailTemplateVersionService = Depends(get_version_service),
) -> dict[str, Any]:
    """Vorschau mit Test-Variablen."""
    with translate_domain_errors():
        return service.preview(version_id, body)


@router.post("/versions/{version_id}/send-test")
async def send_test_email(
    version_id: str,
    body: SendTestRequest,
    tenant_id: str = Depends(_get_tenant),
    service: EmailTemplateVersionService = Depends(get_version_service),
) -> dict[str, Any]:
    """Test-E-Mail senden (Simulation — loggt nur)."""
    with translate_domain_errors():
        return service.send_test(tenant_id, version_id, body)


# Legacy re-exports
__all__ = [
    "router",
    "TEMPLATE_TYPES",
    "VALID_CATEGORIES",
    "VALID_STATUSES",
]