# app/api/v1/admin/email_templates.py
"""
Admin email templates management endpoints.

Provides endpoints for:
- Listing all platform email templates
- Viewing template details (all languages)
- Updating template content
- Preview and test email sending
"""

import logging

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

from app.api.deps import get_current_admin_api
from app.core.database import get_db
from app.services.email_service import EmailService
from models.database.email import EmailCategory, EmailTemplate
from models.database.user import User
from models.schema.email import (
    EmailPreviewRequest,
    EmailPreviewResponse,
    EmailTemplateResponse,
    EmailTemplateSummary,
    EmailTemplateUpdate,
    EmailTestRequest,
    EmailTestResponse,
)

router = APIRouter(prefix="/email-templates")
logger = logging.getLogger(__name__)


@router.get("", response_model=list[EmailTemplateSummary])
def list_templates(
    category: str | None = Query(None, description="Filter by category"),
    include_inactive: bool = Query(False, description="Include inactive templates"),
    db: Session = Depends(get_db),
    current_admin: User = Depends(get_current_admin_api),
):
    """
    List all platform email templates.

    Templates are grouped by code, showing available languages for each.
    """
    templates = EmailTemplate.get_all_templates(
        db, category=category, include_inactive=include_inactive
    )

    return EmailTemplateSummary.from_db_list(templates)


@router.get("/categories")
def get_categories(
    db: Session = Depends(get_db),
    current_admin: User = Depends(get_current_admin_api),
):
    """Get all email template categories."""
    return {
        "categories": [
            {"code": EmailCategory.AUTH.value, "name": "Authentication", "description": "Signup, password reset, verification"},
            {"code": EmailCategory.ORDERS.value, "name": "Orders", "description": "Order confirmations, shipping updates"},
            {"code": EmailCategory.BILLING.value, "name": "Billing", "description": "Invoices, payment failures, subscription changes"},
            {"code": EmailCategory.SYSTEM.value, "name": "System", "description": "Team invites, notifications"},
            {"code": EmailCategory.MARKETING.value, "name": "Marketing", "description": "Newsletters, promotions"},
        ]
    }


@router.get("/{code}", response_model=list[EmailTemplateResponse])
def get_template(
    code: str,
    db: Session = Depends(get_db),
    current_admin: User = Depends(get_current_admin_api),
):
    """
    Get a template by code with all language versions.

    Returns all language versions of the template.
    """
    templates = (
        db.query(EmailTemplate)
        .filter(EmailTemplate.code == code)
        .order_by(EmailTemplate.language)
        .all()
    )

    if not templates:
        raise HTTPException(status_code=404, detail=f"Template not found: {code}")

    return [EmailTemplateResponse.from_db(t) for t in templates]


@router.get("/{code}/{language}", response_model=EmailTemplateResponse)
def get_template_language(
    code: str,
    language: str,
    db: Session = Depends(get_db),
    current_admin: User = Depends(get_current_admin_api),
):
    """
    Get a specific language version of a template.
    """
    template = (
        db.query(EmailTemplate)
        .filter(
            EmailTemplate.code == code,
            EmailTemplate.language == language,
        )
        .first()
    )

    if not template:
        raise HTTPException(
            status_code=404,
            detail=f"Template not found: {code} ({language})",
        )

    return EmailTemplateResponse.from_db(template)


@router.put("/{code}/{language}", response_model=EmailTemplateResponse)
def update_template(
    code: str,
    language: str,
    data: EmailTemplateUpdate,
    db: Session = Depends(get_db),
    current_admin: User = Depends(get_current_admin_api),
):
    """
    Update a specific language version of a template.

    Only provided fields are updated.
    """
    template = (
        db.query(EmailTemplate)
        .filter(
            EmailTemplate.code == code,
            EmailTemplate.language == language,
        )
        .first()
    )

    if not template:
        raise HTTPException(
            status_code=404,
            detail=f"Template not found: {code} ({language})",
        )

    # Update provided fields
    import json

    if data.name is not None:
        template.name = data.name
    if data.description is not None:
        template.description = data.description
    if data.subject is not None:
        template.subject = data.subject
    if data.body_html is not None:
        template.body_html = data.body_html
    if data.body_text is not None:
        template.body_text = data.body_text
    if data.variables is not None:
        template.variables = json.dumps(data.variables)
    if data.required_variables is not None:
        template.required_variables = json.dumps(data.required_variables)
    if data.is_active is not None:
        template.is_active = data.is_active

    db.commit()
    db.refresh(template)

    logger.info(
        f"Email template updated: {code} ({language}) by admin {current_admin.id}"
    )

    return EmailTemplateResponse.from_db(template)


@router.post("/{code}/preview", response_model=EmailPreviewResponse)
def preview_template(
    code: str,
    data: EmailPreviewRequest,
    db: Session = Depends(get_db),
    current_admin: User = Depends(get_current_admin_api),
):
    """
    Preview a template with sample variables.

    Returns rendered subject and body without sending.
    """
    template = (
        db.query(EmailTemplate)
        .filter(
            EmailTemplate.code == code,
            EmailTemplate.language == data.language,
        )
        .first()
    )

    if not template:
        raise HTTPException(
            status_code=404,
            detail=f"Template not found: {code} ({data.language})",
        )

    email_service = EmailService(db)

    # Render with provided variables
    subject = email_service.render_template(template.subject, data.variables)
    body_html = email_service.render_template(template.body_html, data.variables)
    body_text = (
        email_service.render_template(template.body_text, data.variables)
        if template.body_text
        else None
    )

    return EmailPreviewResponse(
        subject=subject,
        body_html=body_html,
        body_text=body_text,
    )


@router.post("/{code}/test", response_model=EmailTestResponse)
def send_test_email(
    code: str,
    data: EmailTestRequest,
    db: Session = Depends(get_db),
    current_admin: User = Depends(get_current_admin_api),
):
    """
    Send a test email to specified address.

    Uses the template with provided variables.
    """
    template = (
        db.query(EmailTemplate)
        .filter(
            EmailTemplate.code == code,
            EmailTemplate.language == data.language,
        )
        .first()
    )

    if not template:
        raise HTTPException(
            status_code=404,
            detail=f"Template not found: {code} ({data.language})",
        )

    email_service = EmailService(db)

    # Send test email
    log = email_service.send_template(
        template_code=code,
        to_email=data.to_email,
        to_name=current_admin.full_name,
        language=data.language,
        variables=data.variables,
        user_id=current_admin.id,
        related_type="email_test",
        include_branding=True,
    )

    if log.status == "sent":
        return EmailTestResponse(
            success=True,
            message=f"Test email sent to {data.to_email}",
            email_log_id=log.id,
        )
    else:
        return EmailTestResponse(
            success=False,
            message=f"Failed to send test email: {log.error_message}",
            email_log_id=log.id,
        )


@router.get("/{code}/logs")
def get_template_logs(
    code: str,
    limit: int = Query(50, ge=1, le=200),
    db: Session = Depends(get_db),
    current_admin: User = Depends(get_current_admin_api),
):
    """
    Get recent email logs for a specific template.

    Useful for debugging and monitoring.
    """
    from models.database.email import EmailLog

    logs = (
        db.query(EmailLog)
        .filter(EmailLog.template_code == code)
        .order_by(EmailLog.created_at.desc())
        .limit(limit)
        .all()
    )

    return {
        "template_code": code,
        "logs": [
            {
                "id": log.id,
                "recipient_email": log.recipient_email,
                "subject": log.subject,
                "status": log.status,
                "sent_at": log.sent_at,
                "error_message": log.error_message,
                "created_at": log.created_at,
            }
            for log in logs
        ],
        "total": len(logs),
    }