# app/api/v1/admin/vendor_domains.py
"""
Admin endpoints for managing vendor custom domains.

Follows the architecture pattern:
- Endpoints only handle HTTP layer
- Business logic in service layer
- Proper exception handling
- Pydantic schemas for validation
"""

import logging
from typing import List

from fastapi import APIRouter, Depends, Path, Body, 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.vendor_domain_service import vendor_domain_service
from app.exceptions import VendorNotFoundException
from models.schema.vendor_domain import (
    VendorDomainCreate,
    VendorDomainUpdate,
    VendorDomainResponse,
    VendorDomainListResponse,
    DomainVerificationInstructions,
    DomainVerificationResponse,
    DomainDeletionResponse,
)
from models.database.user import User
from models.database.vendor import Vendor

router = APIRouter(prefix="/vendors")
logger = logging.getLogger(__name__)


def _get_vendor_by_id(db: Session, vendor_id: int) -> Vendor:
    """
    Helper to get vendor by ID.

    Args:
        db: Database session
        vendor_id: Vendor ID

    Returns:
        Vendor object

    Raises:
        VendorNotFoundException: If vendor not found
    """
    vendor = db.query(Vendor).filter(Vendor.id == vendor_id).first()
    if not vendor:
        raise VendorNotFoundException(str(vendor_id), identifier_type="id")
    return vendor


@router.post("/{vendor_id}/domains", response_model=VendorDomainResponse)
def add_vendor_domain(
        vendor_id: int = Path(..., description="Vendor ID", gt=0),
        domain_data: VendorDomainCreate = Body(...),
        db: Session = Depends(get_db),
        current_admin: User = Depends(get_current_admin_api),
):
    """
    Add a custom domain to vendor (Admin only).

    This endpoint:
    1. Validates the domain format
    2. Checks if domain is already registered
    3. Generates verification token
    4. Creates domain record (unverified, inactive)
    5. Returns domain with verification instructions

    **Domain Examples:**
    - myshop.com
    - shop.mybrand.com
    - customstore.net

    **Next Steps:**
    1. Vendor adds DNS TXT record
    2. Admin clicks "Verify Domain" to confirm ownership
    3. Once verified, domain can be activated

    **Raises:**
    - 404: Vendor not found
    - 409: Domain already registered
    - 422: Invalid domain format or reserved subdomain
    """
    domain = vendor_domain_service.add_domain(
        db=db,
        vendor_id=vendor_id,
        domain_data=domain_data
    )

    return VendorDomainResponse(
        id=domain.id,
        vendor_id=domain.vendor_id,
        domain=domain.domain,
        is_primary=domain.is_primary,
        is_active=domain.is_active,
        is_verified=domain.is_verified,
        ssl_status=domain.ssl_status,
        verification_token=domain.verification_token,
        verified_at=domain.verified_at,
        ssl_verified_at=domain.ssl_verified_at,
        created_at=domain.created_at,
        updated_at=domain.updated_at,
    )


@router.get("/{vendor_id}/domains", response_model=VendorDomainListResponse)
def list_vendor_domains(
        vendor_id: int = Path(..., description="Vendor ID", gt=0),
        db: Session = Depends(get_db),
        current_admin: User = Depends(get_current_admin_api),
):
    """
    List all domains for a vendor (Admin only).

    Returns domains ordered by:
    1. Primary domains first
    2. Creation date (newest first)

    **Raises:**
    - 404: Vendor not found
    """
    # Verify vendor exists
    _get_vendor_by_id(db, vendor_id)

    domains = vendor_domain_service.get_vendor_domains(db, vendor_id)

    return VendorDomainListResponse(
        domains=[
            VendorDomainResponse(
                id=d.id,
                vendor_id=d.vendor_id,
                domain=d.domain,
                is_primary=d.is_primary,
                is_active=d.is_active,
                is_verified=d.is_verified,
                ssl_status=d.ssl_status,
                verification_token=d.verification_token if not d.is_verified else None,
                verified_at=d.verified_at,
                ssl_verified_at=d.ssl_verified_at,
                created_at=d.created_at,
                updated_at=d.updated_at,
            )
            for d in domains
        ],
        total=len(domains)
    )


@router.get("/domains/{domain_id}", response_model=VendorDomainResponse)
def get_domain_details(
        domain_id: int = Path(..., description="Domain ID", gt=0),
        db: Session = Depends(get_db),
        current_admin: User = Depends(get_current_admin_api),
):
    """
    Get detailed information about a specific domain (Admin only).

    **Raises:**
    - 404: Domain not found
    """
    domain = vendor_domain_service.get_domain_by_id(db, domain_id)

    return VendorDomainResponse(
        id=domain.id,
        vendor_id=domain.vendor_id,
        domain=domain.domain,
        is_primary=domain.is_primary,
        is_active=domain.is_active,
        is_verified=domain.is_verified,
        ssl_status=domain.ssl_status,
        verification_token=domain.verification_token if not domain.is_verified else None,
        verified_at=domain.verified_at,
        ssl_verified_at=domain.ssl_verified_at,
        created_at=domain.created_at,
        updated_at=domain.updated_at,
    )


@router.put("/domains/{domain_id}", response_model=VendorDomainResponse)
def update_vendor_domain(
        domain_id: int = Path(..., description="Domain ID", gt=0),
        domain_update: VendorDomainUpdate = Body(...),
        db: Session = Depends(get_db),
        current_admin: User = Depends(get_current_admin_api),
):
    """
    Update domain settings (Admin only).

    **Can update:**
    - `is_primary`: Set as primary domain for vendor
    - `is_active`: Activate or deactivate domain

    **Important:**
    - Cannot activate unverified domains
    - Setting a domain as primary will unset other primary domains
    - Cannot modify domain name (delete and recreate instead)

    **Raises:**
    - 404: Domain not found
    - 400: Cannot activate unverified domain
    """
    domain = vendor_domain_service.update_domain(
        db=db,
        domain_id=domain_id,
        domain_update=domain_update
    )

    return VendorDomainResponse(
        id=domain.id,
        vendor_id=domain.vendor_id,
        domain=domain.domain,
        is_primary=domain.is_primary,
        is_active=domain.is_active,
        is_verified=domain.is_verified,
        ssl_status=domain.ssl_status,
        verification_token=None,  # Don't expose token after updates
        verified_at=domain.verified_at,
        ssl_verified_at=domain.ssl_verified_at,
        created_at=domain.created_at,
        updated_at=domain.updated_at,
    )


@router.delete("/domains/{domain_id}", response_model=DomainDeletionResponse)
def delete_vendor_domain(
        domain_id: int = Path(..., description="Domain ID", gt=0),
        db: Session = Depends(get_db),
        current_admin: User = Depends(get_current_admin_api),
):
    """
    Delete a custom domain (Admin only).

    **Warning:** This is permanent and cannot be undone.

    **Raises:**
    - 404: Domain not found
    """
    # Get domain details before deletion
    domain = vendor_domain_service.get_domain_by_id(db, domain_id)
    vendor_id = domain.vendor_id
    domain_name = domain.domain

    # Delete domain
    message = vendor_domain_service.delete_domain(db, domain_id)

    return DomainDeletionResponse(
        message=message,
        domain=domain_name,
        vendor_id=vendor_id
    )


@router.post("/domains/{domain_id}/verify", response_model=DomainVerificationResponse)
def verify_domain_ownership(
        domain_id: int = Path(..., description="Domain ID", gt=0),
        db: Session = Depends(get_db),
        current_admin: User = Depends(get_current_admin_api),
):
    """
    Verify domain ownership via DNS TXT record (Admin only).

    **Verification Process:**
    1. Queries DNS for TXT record: `_wizamart-verify.{domain}`
    2. Checks if verification token matches
    3. If found, marks domain as verified

    **Requirements:**
    - Vendor must have added TXT record to their DNS
    - DNS propagation may take 5-15 minutes
    - Record format: `_wizamart-verify.domain.com` TXT `{token}`

    **After verification:**
    - Domain can be activated
    - Domain will be available for routing

    **Raises:**
    - 404: Domain not found
    - 400: Already verified, or verification failed
    - 502: DNS query failed
    """
    domain, message = vendor_domain_service.verify_domain(db, domain_id)

    return DomainVerificationResponse(
        message=message,
        domain=domain.domain,
        verified_at=domain.verified_at,
        is_verified=domain.is_verified
    )


@router.get("/domains/{domain_id}/verification-instructions", response_model=DomainVerificationInstructions)
def get_domain_verification_instructions(
        domain_id: int = Path(..., description="Domain ID", gt=0),
        db: Session = Depends(get_db),
        current_admin: User = Depends(get_current_admin_api),
):
    """
    Get DNS verification instructions for domain (Admin only).

    Returns step-by-step instructions for:
    1. Where to add DNS records
    2. What TXT record to create
    3. Links to common registrars
    4. Verification token

    **Use this endpoint to:**
    - Show vendors how to verify their domain
    - Get the exact TXT record values
    - Access registrar links

    **Raises:**
    - 404: Domain not found
    """
    instructions = vendor_domain_service.get_verification_instructions(db, domain_id)

    return DomainVerificationInstructions(
        domain=instructions["domain"],
        verification_token=instructions["verification_token"],
        instructions=instructions["instructions"],
        txt_record=instructions["txt_record"],
        common_registrars=instructions["common_registrars"]
    )