import logging
import mimetypes
import re
import uuid
from pathlib import Path

import httpx

from yuxi.channel.extensions.xmpp.rate_limiter import xmpp_rate_limiter
from yuxi.channel.extensions.xmpp.types import SendXmppResult

logger = logging.getLogger("yuxi.channel.xmpp.outbound")


_MARKDOWN_PATTERNS = [
    (re.compile(r"\*\*(.+?)\*\*"), "strong"),
    (re.compile(r"(?<!\*)\*(?!\*)(.+?)(?<!\*)\*(?!\*)"), "emphasis"),
    (re.compile(r"`([^`]+)`"), "code"),
    (re.compile(r"```(.+?)```", re.DOTALL), "pre"),
]


def _build_markup_spans(text: str) -> list[dict]:
    spans = []
    for pattern, span_type in _MARKDOWN_PATTERNS:
        new_text = ""
        pos = 0
        for match in pattern.finditer(text):
            new_text += text[pos : match.start()]
            start = len(new_text)
            span_content = match.group(1)
            new_text += span_content
            end = len(new_text)
            spans.append({"start": start, "end": end, "type": span_type})
            if span_type == "pre" and span_content.startswith("\n"):
                spans[-1]["start"] += 1
                spans[-1]["end"] -= 1 if span_content.endswith("\n") else 0
            pos = match.end()
        new_text += text[pos:]
        text = new_text
    return spans


async def send_xmpp_text(
    gateway,
    target_id: str,
    content: str,
    reply_to_id: str | None = None,
    thread_id: str | None = None,
) -> SendXmppResult:
    bot = gateway.client
    if bot is None or not gateway.is_connected:
        return SendXmppResult(ok=False, error="XMPP client not connected")

    try:
        is_group = "@conference." in target_id
        mtype = "groupchat" if is_group else "chat"

        msg = bot.make_message(mto=target_id, mbody=content, mtype=mtype)

        if reply_to_id:
            msg["reply"]["id"] = reply_to_id

        if thread_id:
            msg["thread"] = thread_id

        msg["request_receipt"] = True

        if "xep_0394" in bot.plugin:
            spans = _build_markup_spans(content)
            if spans:
                try:
                    markup = bot.plugin["xep_0394"].make_markup(msg, spans)
                    msg["markup"] = markup
                except Exception:
                    pass

        await xmpp_rate_limiter.acquire()
        msg.send()
        return SendXmppResult(ok=True, message_id=str(uuid.uuid4()))
    except Exception as e:
        logger.error("XMPP send_text to %s failed: %s", target_id, e)
        return SendXmppResult(ok=False, error=str(e))


async def send_xmpp_typing(gateway, target_id: str, composing: bool = True) -> None:
    bot = gateway.client
    if bot is None or not gateway.is_connected:
        return
    try:
        if not hasattr(bot, "plugin") or "xep_0085" not in bot.plugin:
            return
        if composing:
            bot.plugin["xep_0085"].chat_state_composing(target_id)
        else:
            bot.plugin["xep_0085"].chat_state_active(target_id)
    except Exception as e:
        logger.debug("XMPP typing indicator failed for %s: %s", target_id, e)


async def send_xmpp_file(
    gateway,
    target_id: str,
    file_path: str,
    *,
    content_type: str | None = None,
    reply_to_id: str | None = None,
    thread_id: str | None = None,
) -> SendXmppResult:
    bot = gateway.client
    if bot is None or not gateway.is_connected:
        return SendXmppResult(ok=False, error="XMPP client not connected")

    if "xep_0363" not in bot.plugin:
        return SendXmppResult(ok=False, error="XEP-0363 HTTP Upload not available")

    path = Path(file_path)
    if not path.exists():
        return SendXmppResult(ok=False, error=f"File not found: {file_path}")

    try:
        if content_type is None:
            content_type, _ = mimetypes.guess_type(file_path)
            content_type = content_type or "application/octet-stream"

        upload_plugin = bot.plugin["xep_0363"]
        size = path.stat().st_size
        data = path.read_bytes()

        slot = await upload_plugin.request_slot(
            target_id,
            filename=path.name,
            size=size,
            content_type=content_type,
        )

        async with httpx.AsyncClient() as client:
            put_url = slot["put"]
            resp = await client.put(
                put_url,
                content=data,
                headers={"Content-Type": content_type},
            )
            resp.raise_for_status()

        get_url = slot["get"]

        is_group = "@conference." in target_id
        mtype = "groupchat" if is_group else "chat"

        msg = bot.make_message(mto=target_id, mbody=get_url, mtype=mtype)
        if reply_to_id:
            msg["reply"]["id"] = reply_to_id
        if thread_id:
            msg["thread"] = thread_id

        oob = msg["oob"]
        if oob is not None:
            oob["url"] = get_url

        await xmpp_rate_limiter.acquire()
        msg.send()
        return SendXmppResult(ok=True, message_id=str(uuid.uuid4()))
    except Exception as e:
        logger.error("XMPP file upload to %s failed: %s", target_id, e)
        return SendXmppResult(ok=False, error=str(e))