# app/api/v1/vendor/content_pages.py
"""
Vendor Content Pages API

Vendor Context: Uses token_vendor_id from JWT token (authenticated vendor API pattern).
The get_current_vendor_api dependency guarantees token_vendor_id is present.

Vendors can:
- View their content pages (includes platform defaults)
- Create/edit/delete their own content page overrides
- Preview pages before publishing
"""

import logging

from fastapi import APIRouter, Depends, Query
from pydantic import BaseModel, Field
from sqlalchemy.orm import Session

from app.api.deps import get_current_vendor_api, get_db
from app.services.content_page_service import content_page_service
from app.services.vendor_service import VendorService
from models.database.user import User

vendor_service = VendorService()

router = APIRouter(prefix="/content-pages")
logger = logging.getLogger(__name__)


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


class VendorContentPageCreate(BaseModel):
    """Schema for creating a vendor 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: str | None = Field(
        None, max_length=300, description="SEO meta description"
    )
    meta_keywords: str | None = 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")
    show_in_legal: bool = Field(
        default=False, description="Show in legal/bottom bar (next to copyright)"
    )
    display_order: int = Field(default=0, description="Display order (lower = first)")


class VendorContentPageUpdate(BaseModel):
    """Schema for updating a vendor content page."""

    title: str | None = Field(None, max_length=200)
    content: str | None = None
    content_format: str | None = None
    meta_description: str | None = Field(None, max_length=300)
    meta_keywords: str | None = Field(None, max_length=300)
    is_published: bool | None = None
    show_in_footer: bool | None = None
    show_in_header: bool | None = None
    show_in_legal: bool | None = None
    display_order: int | None = None


class ContentPageResponse(BaseModel):
    """Schema for content page response."""

    id: int
    vendor_id: int | None
    vendor_name: str | None
    slug: str
    title: str
    content: str
    content_format: str
    meta_description: str | None
    meta_keywords: str | None
    is_published: bool
    published_at: str | None
    display_order: int
    show_in_footer: bool
    show_in_header: bool
    show_in_legal: bool
    is_platform_default: bool
    is_vendor_override: bool
    created_at: str
    updated_at: str
    created_by: int | None
    updated_by: int | None


class CMSUsageResponse(BaseModel):
    """Schema for CMS usage statistics."""

    total_pages: int
    custom_pages: int
    override_pages: int
    pages_limit: int | None
    custom_pages_limit: int | None
    can_create_page: bool
    can_create_custom: bool
    usage_percent: float
    custom_usage_percent: float


# ============================================================================
# VENDOR CONTENT PAGES
# ============================================================================


@router.get("/", response_model=list[ContentPageResponse])
def list_vendor_pages(
    include_unpublished: bool = Query(False, description="Include draft pages"),
    current_user: User = Depends(get_current_vendor_api),
    db: Session = Depends(get_db),
):
    """
    List all content pages available for this vendor.

    Returns vendor-specific overrides + platform defaults (vendor overrides take precedence).
    """
    pages = content_page_service.list_pages_for_vendor(
        db, vendor_id=current_user.token_vendor_id, include_unpublished=include_unpublished
    )

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


@router.get("/overrides", response_model=list[ContentPageResponse])
def list_vendor_overrides(
    include_unpublished: bool = Query(False, description="Include draft pages"),
    current_user: User = Depends(get_current_vendor_api),
    db: Session = Depends(get_db),
):
    """
    List only vendor-specific content pages (no platform defaults).

    Shows what the vendor has customized.
    """
    pages = content_page_service.list_all_vendor_pages(
        db, vendor_id=current_user.token_vendor_id, include_unpublished=include_unpublished
    )

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


@router.get("/{slug}", response_model=ContentPageResponse)
def get_page(
    slug: str,
    include_unpublished: bool = Query(False, description="Include draft pages"),
    current_user: User = Depends(get_current_vendor_api),
    db: Session = Depends(get_db),
):
    """
    Get a specific content page by slug.

    Returns vendor override if exists, otherwise platform default.
    """
    page = content_page_service.get_page_for_vendor_or_raise(
        db,
        slug=slug,
        vendor_id=current_user.token_vendor_id,
        include_unpublished=include_unpublished,
    )

    return page.to_dict()


@router.post("/", response_model=ContentPageResponse, status_code=201)
def create_vendor_page(
    page_data: VendorContentPageCreate,
    current_user: User = Depends(get_current_vendor_api),
    db: Session = Depends(get_db),
):
    """
    Create a vendor-specific content page override.

    This will be shown instead of the platform default for this vendor.
    """
    page = content_page_service.create_page(
        db,
        slug=page_data.slug,
        title=page_data.title,
        content=page_data.content,
        vendor_id=current_user.token_vendor_id,
        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,
        show_in_legal=page_data.show_in_legal,
        display_order=page_data.display_order,
        created_by=current_user.id,
    )
    db.commit()

    return page.to_dict()


@router.put("/{page_id}", response_model=ContentPageResponse)
def update_vendor_page(
    page_id: int,
    page_data: VendorContentPageUpdate,
    current_user: User = Depends(get_current_vendor_api),
    db: Session = Depends(get_db),
):
    """
    Update a vendor-specific content page.

    Can only update pages owned by this vendor.
    """
    # Update with ownership check in service layer
    page = content_page_service.update_vendor_page(
        db,
        page_id=page_id,
        vendor_id=current_user.token_vendor_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,
        show_in_legal=page_data.show_in_legal,
        display_order=page_data.display_order,
        updated_by=current_user.id,
    )
    db.commit()

    return page.to_dict()


@router.delete("/{page_id}", status_code=204)
def delete_vendor_page(
    page_id: int,
    current_user: User = Depends(get_current_vendor_api),
    db: Session = Depends(get_db),
):
    """
    Delete a vendor-specific content page.

    Can only delete pages owned by this vendor.
    After deletion, platform default will be shown (if exists).
    """
    # Delete with ownership check in service layer
    content_page_service.delete_vendor_page(db, page_id, current_user.token_vendor_id)
    db.commit()


# ============================================================================
# CMS USAGE & LIMITS
# ============================================================================


@router.get("/usage", response_model=CMSUsageResponse)
def get_cms_usage(
    current_user: User = Depends(get_current_vendor_api),
    db: Session = Depends(get_db),
):
    """
    Get CMS usage statistics for the vendor.

    Returns page counts and limits based on subscription tier.
    """
    vendor = vendor_service.get_vendor_by_id_optional(db, current_user.token_vendor_id)
    if not vendor:
        return CMSUsageResponse(
            total_pages=0,
            custom_pages=0,
            override_pages=0,
            pages_limit=3,
            custom_pages_limit=0,
            can_create_page=False,
            can_create_custom=False,
            usage_percent=0,
            custom_usage_percent=0,
        )

    # Get vendor's pages
    vendor_pages = content_page_service.list_all_vendor_pages(
        db, vendor_id=current_user.token_vendor_id, include_unpublished=True
    )

    total_pages = len(vendor_pages)
    override_pages = sum(1 for p in vendor_pages if p.is_vendor_override)
    custom_pages = total_pages - override_pages

    # Get limits from subscription tier
    pages_limit = None
    custom_pages_limit = None
    if vendor.subscription and vendor.subscription.tier:
        pages_limit = vendor.subscription.tier.cms_pages_limit
        custom_pages_limit = vendor.subscription.tier.cms_custom_pages_limit

    # Calculate can_create flags
    can_create_page = pages_limit is None or total_pages < pages_limit
    can_create_custom = custom_pages_limit is None or custom_pages < custom_pages_limit

    # Calculate usage percentages
    usage_percent = 0 if pages_limit is None else min(100, (total_pages / pages_limit) * 100) if pages_limit > 0 else 100
    custom_usage_percent = 0 if custom_pages_limit is None else min(100, (custom_pages / custom_pages_limit) * 100) if custom_pages_limit > 0 else 100

    return CMSUsageResponse(
        total_pages=total_pages,
        custom_pages=custom_pages,
        override_pages=override_pages,
        pages_limit=pages_limit,
        custom_pages_limit=custom_pages_limit,
        can_create_page=can_create_page,
        can_create_custom=can_create_custom,
        usage_percent=usage_percent,
        custom_usage_percent=custom_usage_percent,
    )


@router.get("/platform-default/{slug}", response_model=ContentPageResponse)
def get_platform_default(
    slug: str,
    current_user: User = Depends(get_current_vendor_api),
    db: Session = Depends(get_db),
):
    """
    Get the platform default content for a slug.

    Useful for vendors to view the original before/after overriding.
    """
    # Get vendor's platform
    vendor = vendor_service.get_vendor_by_id_optional(db, current_user.token_vendor_id)
    platform_id = 1  # Default to OMS

    if vendor and vendor.platforms:
        platform_id = vendor.platforms[0].id

    # Get platform default (vendor_id=None)
    page = content_page_service.get_vendor_default_page(
        db, platform_id=platform_id, slug=slug, include_unpublished=True
    )

    if not page:
        from app.exceptions import NotFoundException
        raise NotFoundException(f"No platform default found for slug: {slug}")

    return page.to_dict()