# app/api/v1/admin/content_pages.py
"""
Admin Content Pages API

Platform administrators can:
- Create/edit/delete platform default content pages
- View all vendor content pages
- Override vendor content if needed
"""

import logging
from typing import List, Optional
from fastapi import APIRouter, Depends, HTTPException, Query
from pydantic import BaseModel, Field
from sqlalchemy.orm import Session

from app.api.deps import get_current_admin_api, get_db
from app.services.content_page_service import content_page_service
from models.database.user import User

router = APIRouter()
logger = logging.getLogger(__name__)


# ============================================================================
# REQUEST/RESPONSE SCHEMAS
# ============================================================================

class ContentPageCreate(BaseModel):
    """Schema for creating a content page."""
    slug: str = Field(..., max_length=100, description="URL-safe identifier (about, faq, contact, etc.)")
    title: str = Field(..., max_length=200, description="Page title")
    content: str = Field(..., description="HTML or Markdown content")
    content_format: str = Field(default="html", description="Content format: html or markdown")
    meta_description: Optional[str] = Field(None, max_length=300, description="SEO meta description")
    meta_keywords: Optional[str] = Field(None, max_length=300, description="SEO keywords")
    is_published: bool = Field(default=False, description="Publish immediately")
    show_in_footer: bool = Field(default=True, description="Show in footer navigation")
    show_in_header: bool = Field(default=False, description="Show in header navigation")
    display_order: int = Field(default=0, description="Display order (lower = first)")
    vendor_id: Optional[int] = Field(None, description="Vendor ID (None for platform default)")


class ContentPageUpdate(BaseModel):
    """Schema for updating a content page."""
    title: Optional[str] = Field(None, max_length=200)
    content: Optional[str] = None
    content_format: Optional[str] = None
    meta_description: Optional[str] = Field(None, max_length=300)
    meta_keywords: Optional[str] = Field(None, max_length=300)
    is_published: Optional[bool] = None
    show_in_footer: Optional[bool] = None
    show_in_header: Optional[bool] = None
    display_order: Optional[int] = None


class ContentPageResponse(BaseModel):
    """Schema for content page response."""
    id: int
    vendor_id: Optional[int]
    vendor_name: Optional[str]
    slug: str
    title: str
    content: str
    content_format: str
    meta_description: Optional[str]
    meta_keywords: Optional[str]
    is_published: bool
    published_at: Optional[str]
    display_order: int
    show_in_footer: bool
    show_in_header: bool
    is_platform_default: bool
    is_vendor_override: bool
    created_at: str
    updated_at: str
    created_by: Optional[int]
    updated_by: Optional[int]


# ============================================================================
# PLATFORM DEFAULT PAGES (vendor_id=NULL)
# ============================================================================

@router.get("/platform", response_model=List[ContentPageResponse])
def list_platform_pages(
    include_unpublished: bool = Query(False, description="Include draft pages"),
    current_user: User = Depends(get_current_admin_api),
    db: Session = Depends(get_db)
):
    """
    List all platform default content pages.

    These are used as fallbacks when vendors haven't created custom pages.
    """
    pages = content_page_service.list_all_platform_pages(
        db,
        include_unpublished=include_unpublished
    )

    return [page.to_dict() for page in pages]


@router.post("/platform", response_model=ContentPageResponse, status_code=201)
def create_platform_page(
    page_data: ContentPageCreate,
    current_user: User = Depends(get_current_admin_api),
    db: Session = Depends(get_db)
):
    """
    Create a new platform default content page.

    Platform defaults are shown to all vendors who haven't created their own version.
    """
    # Force vendor_id to None for platform pages
    page = content_page_service.create_page(
        db,
        slug=page_data.slug,
        title=page_data.title,
        content=page_data.content,
        vendor_id=None,  # Platform default
        content_format=page_data.content_format,
        meta_description=page_data.meta_description,
        meta_keywords=page_data.meta_keywords,
        is_published=page_data.is_published,
        show_in_footer=page_data.show_in_footer,
        show_in_header=page_data.show_in_header,
        display_order=page_data.display_order,
        created_by=current_user.id
    )

    return page.to_dict()


# ============================================================================
# ALL CONTENT PAGES (Platform + Vendors)
# ============================================================================

@router.get("/", response_model=List[ContentPageResponse])
def list_all_pages(
    vendor_id: Optional[int] = Query(None, description="Filter by vendor ID"),
    include_unpublished: bool = Query(False, description="Include draft pages"),
    current_user: User = Depends(get_current_admin_api),
    db: Session = Depends(get_db)
):
    """
    List all content pages (platform defaults and vendor overrides).

    Filter by vendor_id to see specific vendor pages.
    """
    if vendor_id:
        pages = content_page_service.list_all_vendor_pages(
            db,
            vendor_id=vendor_id,
            include_unpublished=include_unpublished
        )
    else:
        # Get all pages (both platform and vendor)
        from models.database.content_page import ContentPage
        from sqlalchemy import and_

        filters = []
        if not include_unpublished:
            filters.append(ContentPage.is_published == True)

        pages = (
            db.query(ContentPage)
            .filter(and_(*filters) if filters else True)
            .order_by(ContentPage.vendor_id, ContentPage.display_order, ContentPage.title)
            .all()
        )

    return [page.to_dict() for page in pages]


@router.get("/{page_id}", response_model=ContentPageResponse)
def get_page(
    page_id: int,
    current_user: User = Depends(get_current_admin_api),
    db: Session = Depends(get_db)
):
    """Get a specific content page by ID."""
    page = content_page_service.get_page_by_id(db, page_id)

    if not page:
        raise HTTPException(status_code=404, detail="Content page not found")

    return page.to_dict()


@router.put("/{page_id}", response_model=ContentPageResponse)
def update_page(
    page_id: int,
    page_data: ContentPageUpdate,
    current_user: User = Depends(get_current_admin_api),
    db: Session = Depends(get_db)
):
    """Update a content page (platform or vendor)."""
    page = content_page_service.update_page(
        db,
        page_id=page_id,
        title=page_data.title,
        content=page_data.content,
        content_format=page_data.content_format,
        meta_description=page_data.meta_description,
        meta_keywords=page_data.meta_keywords,
        is_published=page_data.is_published,
        show_in_footer=page_data.show_in_footer,
        show_in_header=page_data.show_in_header,
        display_order=page_data.display_order,
        updated_by=current_user.id
    )

    if not page:
        raise HTTPException(status_code=404, detail="Content page not found")

    return page.to_dict()


@router.delete("/{page_id}", status_code=204)
def delete_page(
    page_id: int,
    current_user: User = Depends(get_current_admin_api),
    db: Session = Depends(get_db)
):
    """Delete a content page."""
    success = content_page_service.delete_page(db, page_id)

    if not success:
        raise HTTPException(status_code=404, detail="Content page not found")

    return None