from __future__ import annotations

import time
from typing import Any

import httpx

from yuxi.channels.adapters.wechat.errors import is_token_expired, parse_mp_error
from yuxi.channels.adapters.wechat.format import truncate_text
from yuxi.channels.adapters.wechat.retry import retry_with_backoff
from yuxi.channels.models import DeliveryResult

from .client import MPClient

XML_HEADER = '<?xml version="1.0" encoding="UTF-8"?>'


async def send_mp_custom_message(
    client: MPClient,
    http_client: httpx.AsyncClient,
    to_user: str,
    content: str,
    reply_to_msg_id: str | None = None,
    reply_to_user: str | None = None,
) -> DeliveryResult:
    token = await client.get_access_token()

    display_content = content
    if reply_to_msg_id and reply_to_user:
        quoted_prefix = f"「回复 @{reply_to_user}」\n"
        if len(quoted_prefix + content) <= 2048:
            display_content = quoted_prefix + content

    payload = {
        "touser": to_user,
        "msgtype": "text",
        "text": {"content": truncate_text(display_content, 2048)},
    }
    if reply_to_msg_id:
        payload["_reply_to_msg_id"] = reply_to_msg_id

    try:
        result = await _post_with_token_retry(client, http_client, token, payload)
        return result
    except httpx.HTTPError as e:
        return DeliveryResult(success=False, error=str(e))


async def send_mp_template_message(
    client: MPClient,
    http_client: httpx.AsyncClient,
    to_user: str,
    template_id: str,
    data: dict[str, Any],
    url: str | None = None,
) -> DeliveryResult:
    token = await client.get_access_token()

    payload: dict[str, Any] = {
        "touser": to_user,
        "template_id": template_id,
        "data": data,
    }
    if url:
        payload["url"] = url

    try:
        result = await _post_with_token_retry(client, http_client, token, payload)
        return result
    except httpx.HTTPError as e:
        return DeliveryResult(success=False, error=str(e))


_MP_CUSTOM_SEND_URL = "https://api.weixin.qq.com/cgi-bin/message/custom/send"
_MP_TEMPLATE_SEND_URL = "https://api.weixin.qq.com/cgi-bin/message/template/send"


async def _post_with_token_retry(
    client: MPClient,
    http_client: httpx.AsyncClient,
    token: str,
    payload: dict[str, Any],
) -> DeliveryResult:
    api_url = f"{_MP_CUSTOM_SEND_URL}?access_token={token}"
    if "template_id" in payload:
        api_url = f"{_MP_TEMPLATE_SEND_URL}?access_token={token}"

    async def _post():
        return await http_client.post(api_url, json=payload)

    resp = await retry_with_backoff(_post)
    data = resp.json()

    if data.get("errcode") == 0:
        return DeliveryResult(success=True, message_id=str(data.get("msgid", "")))

    if is_token_expired(data.get("errcode", 0)):
        client.invalidate_token()
        token = await client.get_access_token()
        api_url = f"{_MP_CUSTOM_SEND_URL}?access_token={token}"
        if "template_id" in payload:
            api_url = f"{_MP_TEMPLATE_SEND_URL}?access_token={token}"

        async def _retry_post():
            return await http_client.post(api_url, json=payload)

        resp = await retry_with_backoff(_retry_post)
        data = resp.json()
        if data.get("errcode") == 0:
            return DeliveryResult(success=True, message_id=str(data.get("msgid", "")))

    _, err_detail = parse_mp_error(data)
    return DeliveryResult(success=False, error=err_detail)


async def send_mp_image(
    client: MPClient,
    http_client: httpx.AsyncClient,
    to_user: str,
    image_data: bytes,
    filename: str = "image.png",
) -> DeliveryResult:
    try:
        media_id = await client.upload_temp_media(image_data, filename, "image")
    except Exception as e:
        return DeliveryResult(success=False, error=f"MP image upload failed: {e}")

    token = await client.get_access_token()
    payload = {
        "touser": to_user,
        "msgtype": "image",
        "image": {"media_id": media_id},
    }
    try:
        return await _post_with_token_retry(client, http_client, token, payload)
    except httpx.HTTPError as e:
        return DeliveryResult(success=False, error=str(e))


async def send_mp_voice(
    client: MPClient,
    http_client: httpx.AsyncClient,
    to_user: str,
    voice_data: bytes,
) -> DeliveryResult:
    try:
        media_id = await client.upload_temp_media(voice_data, "voice.amr", "voice")
    except Exception as e:
        return DeliveryResult(success=False, error=f"MP voice upload failed: {e}")

    token = await client.get_access_token()
    payload = {
        "touser": to_user,
        "msgtype": "voice",
        "voice": {"media_id": media_id},
    }
    try:
        return await _post_with_token_retry(client, http_client, token, payload)
    except httpx.HTTPError as e:
        return DeliveryResult(success=False, error=str(e))


async def send_mp_video(
    client: MPClient,
    http_client: httpx.AsyncClient,
    to_user: str,
    video_data: bytes,
    title: str = "",
    description: str = "",
) -> DeliveryResult:
    try:
        media_id = await client.upload_temp_media(video_data, "video.mp4", "video")
    except Exception as e:
        return DeliveryResult(success=False, error=f"MP video upload failed: {e}")

    token = await client.get_access_token()
    payload = {
        "touser": to_user,
        "msgtype": "video",
        "video": {"media_id": media_id, "title": title, "description": description},
    }
    try:
        return await _post_with_token_retry(client, http_client, token, payload)
    except httpx.HTTPError as e:
        return DeliveryResult(success=False, error=str(e))


def build_mp_news_payload(
    to_user: str,
    articles: list[dict[str, Any]],
) -> dict[str, Any]:
    return {
        "touser": to_user,
        "msgtype": "news",
        "news": {"articles": articles},
    }


async def send_mp_news(
    client: MPClient,
    http_client: httpx.AsyncClient,
    payload: dict[str, Any],
) -> DeliveryResult:
    token = await client.get_access_token()
    try:
        return await _post_with_token_retry(client, http_client, token, payload)
    except httpx.HTTPError as e:
        return DeliveryResult(success=False, error=str(e))


def _escape_cdata(text: str) -> str:
    return f"<![CDATA[{text.replace(']]>', ']]]]><![CDATA[>')}]]>"


def build_text_passive_reply(
    to_user: str,
    from_user: str,
    content: str,
) -> str:
    timestamp = int(time.time())
    return (
        f'{XML_HEADER}\n'
        f'<xml>\n'
        f'  <ToUserName>{_escape_cdata(to_user)}</ToUserName>\n'
        f'  <FromUserName>{_escape_cdata(from_user)}</FromUserName>\n'
        f'  <CreateTime>{timestamp}</CreateTime>\n'
        f'  <MsgType>{_escape_cdata("text")}</MsgType>\n'
        f'  <Content>{_escape_cdata(content[:2048])}</Content>\n'
        f'</xml>'
    )


def build_image_passive_reply(
    to_user: str,
    from_user: str,
    media_id: str,
) -> str:
    timestamp = int(time.time())
    return (
        f'{XML_HEADER}\n'
        f'<xml>\n'
        f'  <ToUserName>{_escape_cdata(to_user)}</ToUserName>\n'
        f'  <FromUserName>{_escape_cdata(from_user)}</FromUserName>\n'
        f'  <CreateTime>{timestamp}</CreateTime>\n'
        f'  <MsgType>{_escape_cdata("image")}</MsgType>\n'
        f'  <Image><MediaId>{_escape_cdata(media_id)}</MediaId></Image>\n'
        f'</xml>'
    )


def build_voice_passive_reply(
    to_user: str,
    from_user: str,
    media_id: str,
) -> str:
    timestamp = int(time.time())
    return (
        f'{XML_HEADER}\n'
        f'<xml>\n'
        f'  <ToUserName>{_escape_cdata(to_user)}</ToUserName>\n'
        f'  <FromUserName>{_escape_cdata(from_user)}</FromUserName>\n'
        f'  <CreateTime>{timestamp}</CreateTime>\n'
        f'  <MsgType>{_escape_cdata("voice")}</MsgType>\n'
        f'  <Voice><MediaId>{_escape_cdata(media_id)}</MediaId></Voice>\n'
        f'</xml>'
    )


def build_video_passive_reply(
    to_user: str,
    from_user: str,
    media_id: str,
    title: str = "",
    description: str = "",
) -> str:
    timestamp = int(time.time())
    return (
        f'{XML_HEADER}\n'
        f'<xml>\n'
        f'  <ToUserName>{_escape_cdata(to_user)}</ToUserName>\n'
        f'  <FromUserName>{_escape_cdata(from_user)}</FromUserName>\n'
        f'  <CreateTime>{timestamp}</CreateTime>\n'
        f'  <MsgType>{_escape_cdata("video")}</MsgType>\n'
        f'  <Video>\n'
        f'    <MediaId>{_escape_cdata(media_id)}</MediaId>\n'
        f'    <Title>{_escape_cdata(title)}</Title>\n'
        f'    <Description>{_escape_cdata(description)}</Description>\n'
        f'  </Video>\n'
        f'</xml>'
    )


def build_transfer_customer_service_reply(
    to_user: str,
    from_user: str,
) -> str:
    timestamp = int(time.time())
    return (
        f'{XML_HEADER}\n'
        f'<xml>\n'
        f'  <ToUserName>{_escape_cdata(to_user)}</ToUserName>\n'
        f'  <FromUserName>{_escape_cdata(from_user)}</FromUserName>\n'
        f'  <CreateTime>{timestamp}</CreateTime>\n'
        f'  <MsgType>{_escape_cdata("transfer_customer_service")}</MsgType>\n'
        f'</xml>'
    )


def build_empty_passive_reply() -> str:
    return ""