import logging

import httpx

from yuxi.channel.extensions.intercom.constants import (
    DEFAULT_DATACENTER,
    INTERCOM_API_BASES,
    INTERCOM_API_VERSION,
    INTERCOM_DEFAULT_TIMEOUT,
)
from yuxi.channel.extensions.intercom.errors import IntercomError, IntercomErrorCode

logger = logging.getLogger(__name__)


class IntercomClient:
    def __init__(
        self,
        access_token: str,
        *,
        datacenter: str = DEFAULT_DATACENTER,
        timeout: float = INTERCOM_DEFAULT_TIMEOUT,
    ):
        self._access_token = access_token
        base_url = INTERCOM_API_BASES.get(datacenter, INTERCOM_API_BASES[DEFAULT_DATACENTER])
        self._client = httpx.AsyncClient(
            base_url=base_url,
            headers={
                "Authorization": f"Bearer {access_token}",
                "Accept": "application/json",
                "Intercom-Version": INTERCOM_API_VERSION,
            },
            timeout=httpx.Timeout(timeout),
        )

    async def get_me(self) -> dict:
        resp = await self._request("GET", "/me")
        return resp

    async def reply_conversation(
        self,
        conversation_id: str,
        body: str,
        *,
        message_type: str = "comment",
        reply_type: str = "admin",
        admin_id: str | None = None,
        attachment_urls: list[str] | None = None,
        reply_options: dict | None = None,
    ) -> dict:
        payload: dict = {
            "message_type": message_type,
            "type": reply_type,
            "body": body,
        }
        if admin_id:
            payload["admin_id"] = admin_id
        if attachment_urls:
            payload["attachment_urls"] = attachment_urls
        if reply_options:
            payload["reply_options"] = reply_options

        resp = await self._request(
            "POST",
            f"/conversations/{conversation_id}/reply",
            json=payload,
        )
        return resp

    async def get_conversation(self, conversation_id: str) -> dict:
        resp = await self._request("GET", f"/conversations/{conversation_id}")
        return resp

    async def get_conversation_parts(self, conversation_id: str) -> list[dict]:
        resp = await self._request(
            "GET",
            f"/conversations/{conversation_id}",
            params={"display_as": "plaintext"},
        )
        return resp.get("conversation_parts", {}).get("conversation_parts", [])

    async def manage_conversation(
        self,
        conversation_id: str,
        action: str,
        admin_id: str | None = None,
    ) -> dict:
        payload: dict = {"type": "admin"}
        if admin_id:
            payload["admin_id"] = admin_id
        resp = await self._request(
            "POST",
            f"/conversations/{conversation_id}/manage",
            json=payload,
            params={"action": action},
        )
        return resp

    async def create_conversation(
        self,
        contact_id: str,
        body: str,
        *,
        admin_id: str | None = None,
        message_type: str = "comment",
        attachment_urls: list[str] | None = None,
    ) -> dict:
        payload: dict = {
            "from": {"type": "contact", "id": contact_id},
            "body": body,
        }
        if admin_id:
            payload["admin_id"] = admin_id
        if message_type:
            payload["message_type"] = message_type
        if attachment_urls:
            payload["attachment_urls"] = attachment_urls
        resp = await self._request("POST", "/conversations", json=payload)
        return resp

    async def search_conversations(
        self,
        query: dict,
        *,
        page: int = 1,
        per_page: int = 20,
    ) -> dict:
        payload = {
            "query": query,
            "pagination": {"page": page, "per_page": min(per_page, 150)},
        }
        resp = await self._request("POST", "/conversations/search", json=payload)
        return resp

    async def get_contact(self, contact_id: str) -> dict:
        resp = await self._request("GET", f"/contacts/{contact_id}")
        return resp

    async def create_contact(self, email: str, *, name: str | None = None, **attrs) -> dict:
        payload: dict = {"email": email}
        if name:
            payload["name"] = name
        payload.update(attrs)
        resp = await self._request("POST", "/contacts", json=payload)
        return resp

    async def update_contact(self, contact_id: str, **attrs) -> dict:
        resp = await self._request("PUT", f"/contacts/{contact_id}", json=attrs)
        return resp

    async def delete_contact(self, contact_id: str) -> dict:
        resp = await self._request("DELETE", f"/contacts/{contact_id}")
        return resp

    async def list_contacts(self, *, page: int = 1, per_page: int = 20, email: str | None = None) -> dict:
        params: dict = {"page": page, "per_page": min(per_page, 150)}
        if email:
            params["email"] = email
        resp = await self._request("GET", "/contacts", params=params)
        return resp

    async def search_contacts(
        self,
        query: dict,
        *,
        page: int = 1,
        per_page: int = 20,
    ) -> dict:
        payload = {
            "query": query,
            "pagination": {"page": page, "per_page": min(per_page, 150)},
        }
        resp = await self._request("POST", "/contacts/search", json=payload)
        return resp

    async def archive_contact(self, contact_id: str) -> dict:
        resp = await self._request("POST", f"/contacts/{contact_id}/archive")
        return resp

    async def add_conversation_tags(self, conversation_id: str, tags: list[str]) -> dict:
        payload = {"tags": [{"id": tag} for tag in tags]}
        resp = await self._request(
            "POST",
            f"/conversations/{conversation_id}/tags",
            json=payload,
        )
        return resp

    async def remove_conversation_tag(self, conversation_id: str, tag_id: str) -> dict:
        resp = await self._request(
            "DELETE",
            f"/conversations/{conversation_id}/tags/{tag_id}",
        )
        return resp

    async def list_tags(self) -> list[dict]:
        resp = await self._request("GET", "/tags")
        return resp.get("data", [])

    async def update_conversation(self, conversation_id: str, **kwargs) -> dict:
        resp = await self._request(
            "PUT",
            f"/conversations/{conversation_id}",
            json=kwargs,
        )
        return resp

    async def snooze_conversation(self, conversation_id: str, snooze_until: int) -> dict:
        return await self.update_conversation(conversation_id, snoozed_until=snooze_until)

    async def assign_conversation(self, conversation_id: str, admin_id: str) -> dict:
        return await self.update_conversation(conversation_id, assignee_id=admin_id, assignee_type="admin")

    async def delete_conversation_part(self, conversation_id: str, part_id: str) -> dict:
        resp = await self._request(
            "DELETE",
            f"/conversations/{conversation_id}/parts/{part_id}",
        )
        return resp

    async def create_ticket(
        self,
        subject: str,
        message_body: str,
        contact_id: str,
        *,
        admin_id: str | None = None,
        ticket_type_id: str | None = None,
        ticket_attributes: dict | None = None,
    ) -> dict:
        payload: dict = {
            "contacts": [{"id": contact_id}],
            "subject": subject,
            "ticket_type": {"body": message_body},
        }
        if admin_id:
            payload["admin_assignee_id"] = admin_id
        if ticket_type_id:
            payload["ticket_type_id"] = ticket_type_id
        if ticket_attributes:
            payload["ticket_attributes"] = ticket_attributes
        resp = await self._request("POST", "/tickets", json=payload)
        return resp

    async def reply_ticket(
        self,
        ticket_id: str,
        body: str,
        *,
        admin_id: str | None = None,
        attachment_urls: list[str] | None = None,
    ) -> dict:
        payload: dict = {
            "type": "admin",
            "body": body,
        }
        if admin_id:
            payload["admin_id"] = admin_id
        if attachment_urls:
            payload["attachment_urls"] = attachment_urls
        resp = await self._request("POST", f"/tickets/{ticket_id}/reply", json=payload)
        return resp

    async def get_ticket(self, ticket_id: str) -> dict:
        resp = await self._request("GET", f"/tickets/{ticket_id}")
        return resp

    async def update_ticket(self, ticket_id: str, **kwargs) -> dict:
        resp = await self._request("PUT", f"/tickets/{ticket_id}", json=kwargs)
        return resp

    async def get_company(self, company_id: str) -> dict:
        resp = await self._request("GET", f"/companies/{company_id}")
        return resp

    async def create_company(self, name: str, *, company_id: str | None = None, **attrs) -> dict:
        payload: dict = {"name": name}
        if company_id:
            payload["company_id"] = company_id
        payload.update(attrs)
        resp = await self._request("POST", "/companies", json=payload)
        return resp

    async def update_company(self, company_id: str, **attrs) -> dict:
        resp = await self._request("PUT", f"/companies/{company_id}", json=attrs)
        return resp

    async def list_companies(self, *, page: int = 1, per_page: int = 20) -> dict:
        resp = await self._request(
            "GET",
            "/companies",
            params={"page": page, "per_page": min(per_page, 150)},
        )
        return resp

    async def search_companies(
        self,
        query: dict,
        *,
        page: int = 1,
        per_page: int = 20,
    ) -> dict:
        payload = {
            "query": query,
            "pagination": {"page": page, "per_page": min(per_page, 150)},
        }
        resp = await self._request("POST", "/companies/search", json=payload)
        return resp

    async def attach_contact_to_company(self, contact_id: str, company_id: str) -> dict:
        resp = await self._request(
            "POST",
            f"/contacts/{contact_id}/companies",
            json={"id": company_id},
        )
        return resp

    async def detach_contact_from_company(self, contact_id: str, company_id: str) -> dict:
        resp = await self._request(
            "DELETE",
            f"/contacts/{contact_id}/companies/{company_id}",
        )
        return resp

    async def list_articles(self, *, page: int = 1, per_page: int = 20, state: str = "published") -> dict:
        resp = await self._request(
            "GET",
            "/articles",
            params={"page": page, "per_page": per_page, "state": state},
        )
        return resp

    async def get_article(self, article_id: str) -> dict:
        resp = await self._request("GET", f"/articles/{article_id}")
        return resp

    async def list_brands(self) -> list[dict]:
        resp = await self._request("GET", "/brands")
        return resp.get("data", [])

    async def get_brand(self, brand_id: str) -> dict:
        resp = await self._request("GET", f"/brands/{brand_id}")
        return resp

    async def list_conversations(self, *, page: int = 1, per_page: int = 20) -> dict:
        resp = await self._request(
            "GET",
            "/conversations",
            params={"page": page, "per_page": min(per_page, 150)},
        )
        return resp

    async def delete_conversation(self, conversation_id: str) -> dict:
        resp = await self._request("DELETE", f"/conversations/{conversation_id}")
        return resp

    async def redact_conversation_part(self, conversation_id: str, part_id: str) -> dict:
        resp = await self._request(
            "POST",
            f"/conversations/{conversation_id}/parts/{part_id}/redact",
        )
        return resp

    async def convert_conversation_to_ticket(self, conversation_id: str, *, admin_id: str | None = None) -> dict:
        payload: dict = {}
        if admin_id:
            payload["admin_id"] = admin_id
        resp = await self._request(
            "POST",
            f"/conversations/{conversation_id}/convert-to-ticket",
            json=payload,
        )
        return resp

    async def run_assignment_rules(self, conversation_id: str) -> dict:
        resp = await self._request(
            "POST",
            f"/conversations/{conversation_id}/run_assignment_rules",
        )
        return resp

    async def attach_contact_to_conversation(self, conversation_id: str, contact_id: str) -> dict:
        resp = await self._request(
            "POST",
            f"/conversations/{conversation_id}/contacts",
            json={"id": contact_id},
        )
        return resp

    async def detach_contact_from_conversation(self, conversation_id: str, contact_id: str) -> dict:
        resp = await self._request(
            "DELETE",
            f"/conversations/{conversation_id}/contacts/{contact_id}",
        )
        return resp

    async def list_tickets(self, *, page: int = 1, per_page: int = 20) -> dict:
        resp = await self._request(
            "GET",
            "/tickets",
            params={"page": page, "per_page": min(per_page, 150)},
        )
        return resp

    async def search_tickets(
        self,
        query: dict,
        *,
        page: int = 1,
        per_page: int = 20,
    ) -> dict:
        payload = {
            "query": query,
            "pagination": {"page": page, "per_page": min(per_page, 150)},
        }
        resp = await self._request("POST", "/tickets/search", json=payload)
        return resp

    async def merge_contacts(self, primary_id: str, secondary_id: str) -> dict:
        resp = await self._request(
            "POST",
            "/contacts/merge",
            json={
                "primary_contact_id": primary_id,
                "secondary_contact_id": secondary_id,
            },
        )
        return resp

    async def add_contact_tags(self, contact_id: str, tags: list[str]) -> dict:
        payload = {"tags": [{"id": tag} for tag in tags]}
        resp = await self._request(
            "POST",
            f"/contacts/{contact_id}/tags",
            json=payload,
        )
        return resp

    async def remove_contact_tag(self, contact_id: str, tag_id: str) -> dict:
        resp = await self._request(
            "DELETE",
            f"/contacts/{contact_id}/tags/{tag_id}",
        )
        return resp

    async def get_contact_subscriptions(self, contact_id: str) -> dict:
        resp = await self._request("GET", f"/contacts/{contact_id}/subscriptions")
        return resp

    async def update_contact_subscriptions(self, contact_id: str, subscriptions: list[dict]) -> dict:
        resp = await self._request(
            "PUT",
            f"/contacts/{contact_id}/subscriptions",
            json={"subscriptions": subscriptions},
        )
        return resp

    async def send_email(
        self,
        to: list[str],
        subject: str,
        body_html: str,
        *,
        cc: list[str] | None = None,
        bcc: list[str] | None = None,
    ) -> dict:
        payload: dict = {
            "to": to,
            "subject": subject,
            "body": body_html,
        }
        if cc:
            payload["cc"] = cc
        if bcc:
            payload["bcc"] = bcc
        resp = await self._request("POST", "/emails", json=payload)
        return resp

    async def send_message(
        self,
        contact_id: str,
        body: str,
        *,
        admin_id: str | None = None,
    ) -> dict:
        payload: dict = {
            "from": {"type": "admin", "id": admin_id} if admin_id else {"type": "admin"},
            "to": {"type": "contact", "id": contact_id},
            "body": body,
        }
        resp = await self._request("POST", "/messages", json=payload)
        return resp

    async def close(self) -> None:
        await self._client.aclose()

    async def _paginated_request(self, method: str, path: str, *, params: dict | None = None, **kwargs) -> list[dict]:
        params = params or {}
        results: list[dict] = []
        while True:
            resp = await self._request(method, path, params=params, **kwargs)
            data = resp.get("data", [])
            results.extend(data)
            pages_info = resp.get("pages", {})
            next_cursor = pages_info.get("next", {}).get("starting_after")
            if not next_cursor:
                break
            params["starting_after"] = next_cursor
        return results

    async def _request(self, method: str, path: str, **kwargs) -> dict:
        try:
            resp = await self._client.request(method, path, **kwargs)
        except httpx.TimeoutException as e:
            raise IntercomError(
                IntercomErrorCode.NETWORK_ERROR,
                f"Request timeout: {method} {path}",
                retryable=True,
            ) from e
        except httpx.ConnectError as e:
            raise IntercomError(
                IntercomErrorCode.NETWORK_ERROR,
                f"Connection error: {method} {path}",
                retryable=True,
            ) from e
        except httpx.HTTPError as e:
            raise IntercomError(
                IntercomErrorCode.NETWORK_ERROR,
                f"HTTP error: {method} {path}: {e}",
                retryable=True,
            ) from e

        if resp.status_code == 401:
            raise IntercomError(
                IntercomErrorCode.AUTH_ERROR,
                f"Unauthorized: {resp.text}",
                retryable=False,
            )
        if resp.status_code == 403:
            raise IntercomError(
                IntercomErrorCode.AUTH_ERROR,
                f"Forbidden: {resp.text}",
                retryable=False,
            )
        if resp.status_code == 404:
            raise IntercomError(
                IntercomErrorCode.NOT_FOUND,
                f"Not found: {method} {path}",
                retryable=False,
            )
        if resp.status_code == 429:
            retry_after = resp.headers.get("Retry-After")
            raise IntercomError(
                IntercomErrorCode.RATE_LIMITED,
                f"Rate limited (Retry-After: {retry_after or 'N/A'}): {resp.text}",
                retryable=True,
            )
        if resp.status_code >= 500:
            raise IntercomError(
                IntercomErrorCode.NETWORK_ERROR,
                f"Server error {resp.status_code}: {resp.text}",
                retryable=True,
            )
        if resp.status_code >= 400:
            raise IntercomError(
                IntercomErrorCode.UNKNOWN,
                f"Client error {resp.status_code}: {resp.text}",
                retryable=False,
            )

        remaining = resp.headers.get("X-RateLimit-Remaining")
        limit = resp.headers.get("X-RateLimit-Limit")
        if remaining is not None and int(remaining) < 10:
            logger.warning("Intercom rate limit low: %s/%s", remaining, limit)

        try:
            return resp.json()
        except Exception:
            return {}