from __future__ import annotations

from datetime import datetime, timezone
from typing import Any

import requests
from fastapi import HTTPException

from app.services.harborforge_config import get_discord_wakeup_config

DISCORD_API_BASE = "https://discord.com/api/v10"
WAKEUP_CATEGORY_NAME = "HarborForge Wakeup"


def _headers(bot_token: str) -> dict[str, str]:
    return {
        "Authorization": f"Bot {bot_token}",
        "Content-Type": "application/json",
    }


def _ensure_category(guild_id: str, bot_token: str) -> str | None:
    resp = requests.get(f"{DISCORD_API_BASE}/guilds/{guild_id}/channels", headers=_headers(bot_token), timeout=15)
    if not resp.ok:
        raise HTTPException(status_code=502, detail=f"Discord list channels failed: {resp.text}")
    for ch in resp.json():
        if ch.get("type") == 4 and ch.get("name") == WAKEUP_CATEGORY_NAME:
            return ch.get("id")
    payload = {"name": WAKEUP_CATEGORY_NAME, "type": 4}
    created = requests.post(f"{DISCORD_API_BASE}/guilds/{guild_id}/channels", headers=_headers(bot_token), json=payload, timeout=15)
    if not created.ok:
        raise HTTPException(status_code=502, detail=f"Discord create category failed: {created.text}")
    return created.json().get("id")


def create_private_wakeup_channel(discord_user_id: str, title: str, message: str) -> dict[str, Any]:
    cfg = get_discord_wakeup_config()
    guild_id = cfg.get("guild_id")
    bot_token = cfg.get("bot_token")
    if not guild_id or not bot_token:
        raise HTTPException(status_code=400, detail="Discord wakeup config is incomplete")

    category_id = _ensure_category(guild_id, bot_token)
    channel_name = f"wake-{discord_user_id[-6:]}-{int(datetime.now(timezone.utc).timestamp())}"
    payload = {
        "name": channel_name,
        "type": 0,
        "parent_id": category_id,
        "permission_overwrites": [
            {"id": guild_id, "type": 0, "deny": "1024"},
            {"id": discord_user_id, "type": 1, "allow": "1024"},
        ],
        "topic": title,
    }
    created = requests.post(f"{DISCORD_API_BASE}/guilds/{guild_id}/channels", headers=_headers(bot_token), json=payload, timeout=15)
    if not created.ok:
        raise HTTPException(status_code=502, detail=f"Discord create channel failed: {created.text}")
    channel = created.json()
    sent = requests.post(
        f"{DISCORD_API_BASE}/channels/{channel['id']}/messages",
        headers=_headers(bot_token),
        json={"content": message},
        timeout=15,
    )
    if not sent.ok:
        raise HTTPException(status_code=502, detail=f"Discord send message failed: {sent.text}")
    return {
        "guild_id": guild_id,
        "channel_id": channel.get("id"),
        "channel_name": channel.get("name"),
        "message_id": sent.json().get("id"),
    }