"""
Publisher para Facebook Pages (Meta Graph API).
"""

from typing import Optional, List, Dict
import httpx

from app.core.config import settings
from app.publishers.base import BasePublisher, PublishResult


class FacebookPublisher(BasePublisher):
    """Publisher para Facebook Pages usando Meta Graph API."""

    platform = "facebook"
    char_limit = 63206  # Límite real de Facebook
    base_url = "https://graph.facebook.com/v18.0"

    def __init__(self):
        self.access_token = settings.META_ACCESS_TOKEN
        self.page_id = settings.FACEBOOK_PAGE_ID

    def validate_content(self, content: str) -> bool:
        """Validar longitud del post."""
        return len(content) <= self.char_limit

    async def publish(
        self,
        content: str,
        image_path: Optional[str] = None
    ) -> PublishResult:
        """Publicar en Facebook Page."""
        if not self.access_token or not self.page_id:
            return PublishResult(
                success=False,
                error_message="Credenciales de Facebook no configuradas"
            )

        try:
            async with httpx.AsyncClient() as client:
                if image_path:
                    # Publicar con imagen
                    url = f"{self.base_url}/{self.page_id}/photos"
                    payload = {
                        "caption": content,
                        "url": image_path,  # URL pública de la imagen
                        "access_token": self.access_token
                    }
                else:
                    # Publicar solo texto
                    url = f"{self.base_url}/{self.page_id}/feed"
                    payload = {
                        "message": content,
                        "access_token": self.access_token
                    }

                response = await client.post(url, data=payload)
                response.raise_for_status()
                post_id = response.json().get("id")

                return PublishResult(
                    success=True,
                    post_id=post_id,
                    url=f"https://www.facebook.com/{post_id}"
                )

        except httpx.HTTPError as e:
            return PublishResult(
                success=False,
                error_message=str(e)
            )

    async def publish_thread(
        self,
        posts: List[str],
        images: Optional[List[str]] = None
    ) -> PublishResult:
        """Publicar como un solo post largo en Facebook."""
        # Facebook no tiene threads, concatenamos el contenido
        combined_content = "\n\n".join(posts)

        # Usar la primera imagen si existe
        image = images[0] if images else None

        return await self.publish(combined_content, image)

    async def reply(
        self,
        post_id: str,
        content: str
    ) -> PublishResult:
        """Responder a un comentario en Facebook."""
        if not self.access_token:
            return PublishResult(
                success=False,
                error_message="Token de acceso no configurado"
            )

        try:
            async with httpx.AsyncClient() as client:
                url = f"{self.base_url}/{post_id}/comments"
                payload = {
                    "message": content,
                    "access_token": self.access_token
                }

                response = await client.post(url, data=payload)
                response.raise_for_status()
                comment_id = response.json().get("id")

                return PublishResult(
                    success=True,
                    post_id=comment_id
                )

        except httpx.HTTPError as e:
            return PublishResult(
                success=False,
                error_message=str(e)
            )

    async def like(self, post_id: str) -> bool:
        """Dar like a un post/comentario."""
        if not self.access_token:
            return False

        try:
            async with httpx.AsyncClient() as client:
                url = f"{self.base_url}/{post_id}/likes"
                payload = {"access_token": self.access_token}

                response = await client.post(url, data=payload)
                response.raise_for_status()
                return response.json().get("success", False)

        except httpx.HTTPError:
            return False

    async def get_mentions(self, since_id: Optional[str] = None) -> List[Dict]:
        """Obtener menciones de la página."""
        if not self.access_token or not self.page_id:
            return []

        try:
            async with httpx.AsyncClient() as client:
                url = f"{self.base_url}/{self.page_id}/tagged"
                params = {
                    "fields": "id,message,from,created_time,permalink_url",
                    "access_token": self.access_token
                }

                response = await client.get(url, params=params)
                response.raise_for_status()
                data = response.json()

                return data.get("data", [])

        except httpx.HTTPError:
            return []

    async def get_comments(self, post_id: str) -> List[Dict]:
        """Obtener comentarios de un post."""
        if not self.access_token:
            return []

        try:
            async with httpx.AsyncClient() as client:
                url = f"{self.base_url}/{post_id}/comments"
                params = {
                    "fields": "id,message,from,created_time,like_count",
                    "access_token": self.access_token
                }

                response = await client.get(url, params=params)
                response.raise_for_status()
                data = response.json()

                return data.get("data", [])

        except httpx.HTTPError:
            return []

    async def get_page_messages(self) -> List[Dict]:
        """Obtener mensajes de la página (inbox)."""
        if not self.access_token or not self.page_id:
            return []

        try:
            async with httpx.AsyncClient() as client:
                url = f"{self.base_url}/{self.page_id}/conversations"
                params = {
                    "fields": "id,participants,messages{message,from,created_time}",
                    "access_token": self.access_token
                }

                response = await client.get(url, params=params)
                response.raise_for_status()
                data = response.json()

                return data.get("data", [])

        except httpx.HTTPError:
            return []

    async def send_message(self, recipient_id: str, message: str) -> PublishResult:
        """Enviar mensaje directo a un usuario."""
        if not self.access_token or not self.page_id:
            return PublishResult(
                success=False,
                error_message="Credenciales no configuradas"
            )

        try:
            async with httpx.AsyncClient() as client:
                url = f"{self.base_url}/{self.page_id}/messages"
                payload = {
                    "recipient": {"id": recipient_id},
                    "message": {"text": message},
                    "access_token": self.access_token
                }

                response = await client.post(url, json=payload)
                response.raise_for_status()
                message_id = response.json().get("message_id")

                return PublishResult(
                    success=True,
                    post_id=message_id
                )

        except httpx.HTTPError as e:
            return PublishResult(
                success=False,
                error_message=str(e)
            )

    async def delete(self, post_id: str) -> bool:
        """Eliminar un post."""
        if not self.access_token:
            return False

        try:
            async with httpx.AsyncClient() as client:
                url = f"{self.base_url}/{post_id}"
                params = {"access_token": self.access_token}

                response = await client.delete(url, params=params)
                response.raise_for_status()
                return response.json().get("success", False)

        except httpx.HTTPError:
            return False