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

from app.api.deps import get_current_admin_api, get_db
from app.exceptions import ValidationException
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"
    )
    template: str = Field(
        default="default",
        max_length=50,
        description="Template name (default, minimal, modern)",
    )
    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)")
    vendor_id: int | None = Field(
        None, description="Vendor ID (None for platform default)"
    )


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

    title: str | None = Field(None, max_length=200)
    content: str | None = None
    content_format: str | None = None
    template: str | None = Field(None, max_length=50)
    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
    platform_id: int | None = None
    platform_code: str | None = None
    platform_name: str | None = None
    vendor_id: int | None
    vendor_name: str | None
    slug: str
    title: str
    content: str
    content_format: str
    template: str | None = None
    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_page: bool = False
    is_platform_default: bool = False  # Deprecated: use is_platform_page
    is_vendor_default: bool = False
    is_vendor_override: bool = False
    page_tier: str | None = None
    created_at: str
    updated_at: str
    created_by: int | None
    updated_by: int | None


# ============================================================================
# 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,
        template=page_data.template,
        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()


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


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

    Vendor pages override platform defaults for a specific vendor.
    """
    if not page_data.vendor_id:
        raise ValidationException(
            message="vendor_id is required for vendor pages. Use /platform for platform defaults.",
            field="vendor_id",
        )

    page = content_page_service.create_page(
        db,
        slug=page_data.slug,
        title=page_data.title,
        content=page_data.content,
        vendor_id=page_data.vendor_id,
        content_format=page_data.content_format,
        template=page_data.template,
        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()


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


@router.get("/", response_model=list[ContentPageResponse])
def list_all_pages(
    vendor_id: int | None = 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.
    """
    pages = content_page_service.list_all_pages(
        db, vendor_id=vendor_id, include_unpublished=include_unpublished
    )

    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_or_raise(db, page_id)
    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_or_raise(
        db,
        page_id=page_id,
        title=page_data.title,
        content=page_data.content,
        content_format=page_data.content_format,
        template=page_data.template,
        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_page(
    page_id: int,
    current_user: User = Depends(get_current_admin_api),
    db: Session = Depends(get_db),
):
    """Delete a content page."""
    content_page_service.delete_page_or_raise(db, page_id)
    db.commit()


# ============================================================================
# HOMEPAGE SECTIONS MANAGEMENT
# ============================================================================


class HomepageSectionsResponse(BaseModel):
    """Response containing homepage sections with platform language info."""

    sections: dict | None = None
    supported_languages: list[str] = Field(default_factory=lambda: ["fr", "de", "en"])
    default_language: str = "fr"


class SectionUpdateResponse(BaseModel):
    """Response after updating sections."""

    message: str
    sections: dict | None = None


@router.get("/{page_id}/sections", response_model=HomepageSectionsResponse)
def get_page_sections(
    page_id: int,
    current_user: User = Depends(get_current_admin_api),
    db: Session = Depends(get_db),
):
    """
    Get homepage sections for a content page.

    Returns sections along with platform language settings for the editor.
    """
    page = content_page_service.get_page_by_id_or_raise(db, page_id)

    # Get platform languages
    platform = page.platform
    supported_languages = (
        platform.supported_languages if platform else ["fr", "de", "en"]
    )
    default_language = platform.default_language if platform else "fr"

    return {
        "sections": page.sections,
        "supported_languages": supported_languages,
        "default_language": default_language,
    }


@router.put("/{page_id}/sections", response_model=SectionUpdateResponse)
def update_page_sections(
    page_id: int,
    sections: dict,
    current_user: User = Depends(get_current_admin_api),
    db: Session = Depends(get_db),
):
    """
    Update all homepage sections at once.

    Expected structure:
    {
        "hero": { ... },
        "features": { ... },
        "pricing": { ... },
        "cta": { ... }
    }
    """
    page = content_page_service.update_homepage_sections(
        db,
        page_id=page_id,
        sections=sections,
        updated_by=current_user.id,
    )
    db.commit()

    return {
        "message": "Sections updated successfully",
        "sections": page.sections,
    }


@router.put("/{page_id}/sections/{section_name}", response_model=SectionUpdateResponse)
def update_single_section(
    page_id: int,
    section_name: str,
    section_data: dict,
    current_user: User = Depends(get_current_admin_api),
    db: Session = Depends(get_db),
):
    """
    Update a single section (hero, features, pricing, or cta).

    section_name must be one of: hero, features, pricing, cta
    """
    if section_name not in ["hero", "features", "pricing", "cta"]:
        raise ValidationException(
            message=f"Invalid section name: {section_name}. Must be one of: hero, features, pricing, cta",
            field="section_name",
        )

    page = content_page_service.update_single_section(
        db,
        page_id=page_id,
        section_name=section_name,
        section_data=section_data,
        updated_by=current_user.id,
    )
    db.commit()

    return {
        "message": f"Section '{section_name}' updated successfully",
        "sections": page.sections,
    }