"""Telegram command handlers for JIGAIDO - Thin wrappers around core services."""

import time
from datetime import datetime
from functools import wraps
from typing import Optional
from zoneinfo import ZoneInfo, ZoneInfoNotFoundError

import dateparser
from telegram import Update
from telegram.ext import ContextTypes

from adapters.storage.json_file import JsonFileRoomStorage, JsonFileTrackingStorage
from core.services import BountyService, TrackingService

ROOM_STORAGE = JsonFileRoomStorage()
TRACKING_STORAGE = JsonFileTrackingStorage()
BOUNTY_SERVICE = BountyService(ROOM_STORAGE)
TRACKING_SERVICE = TrackingService(TRACKING_STORAGE, ROOM_STORAGE)

TELEGRAM_BOT_USERNAME = "your_bot_username"


def format_due_date(due_date_ts: int | None, timezone_str: str) -> str:
    """Format due date as human-readable with timezone.

    Examples:
        No due date:     (none shown)
        Date only:       4 April 2026
        Date + time:     4 April 2026 14:30
        With timezone:   4 April 2026 14:30 (Asia/Jakarta)
    """
    if not due_date_ts:
        return ""

    try:
        tz = ZoneInfo(timezone_str)
    except (KeyError, ZoneInfoNotFoundError):
        tz = ZoneInfo("UTC")

    dt = datetime.fromtimestamp(due_date_ts, tz=tz)

    date_str = dt.strftime("%-d %B %Y")

    if dt.hour != 0 or dt.minute != 0:
        date_str += f" {dt.strftime('%H:%M')}"
        date_str += f" ({timezone_str})"

    return date_str


def extract_args(text: str) -> list[str]:
    if not text:
        return []
    tokens = text.strip().split()
    return tokens[1:] if len(tokens) > 1 else []


def parse_args(args: list[str]) -> tuple[Optional[str], Optional[str], Optional[int]]:
    text = None
    link = None
    due_date_ts = None

    remaining = []
    for arg in args:
        if not link and (arg.startswith("http://") or arg.startswith("https://")):
            link = arg
        elif due_date_ts is None:
            parsed = dateparser.parse(arg)
            if parsed:
                due_date_ts = int(parsed.timestamp())
            else:
                remaining.append(arg)
        else:
            remaining.append(arg)

    text = " ".join(remaining) if remaining else None
    return text, link, due_date_ts


def format_bounty(b, show_id: bool = True, room_id: int | None = None) -> str:
    parts = []
    if show_id:
        parts.append(f"[#{b.id}]")
    if b.text:
        parts.append(b.text)
    if b.link:
        parts.append(f"🔗 {b.link}")
    if b.due_date_ts:
        timezone_str = "UTC"
        if room_id is not None:
            timezone_str = BOUNTY_SERVICE.get_timezone(room_id)

        due_str = format_due_date(b.due_date_ts, timezone_str)
        days_left = (b.due_date_ts - int(time.time())) // 86400
        if days_left < 0:
            parts.append(f"⏰ {due_str} (OVERDUE)")
        elif days_left == 0:
            parts.append(f"⏰ {due_str} (TODAY)")
        else:
            parts.append(f"⏰ {due_str} ({days_left}d)")
    if b.created_by_user_id:
        parts.append(f"by {b.created_by_user_id}")
    return " | ".join(parts)


def is_group(update: Update) -> bool:
    return update.effective_chat.type != "private"


def get_group_id(update: Update) -> int:
    return update.effective_chat.id


def get_user_id(update: Update) -> int:
    return update.effective_user.id


def get_room_id(update: Update) -> int:
    """Get room_id for the current context.

    For groups: negative group_id
    For DMs: positive user_id
    """
    if is_group(update):
        return get_group_id(update)
    return get_user_id(update)


async def cmd_bounty(update: Update, ctx: ContextTypes.DEFAULT_TYPE) -> None:
    room_id = get_room_id(update)
    bounties = BOUNTY_SERVICE.list_bounties(room_id)

    if not bounties:
        await update.message.reply_text("No bounties yet.")
        return

    lines = [format_bounty(b, show_id=True, room_id=room_id) for b in bounties]
    await update.message.reply_text("\n".join(lines), disable_web_page_preview=True)


async def cmd_my(update: Update, ctx: ContextTypes.DEFAULT_TYPE) -> None:
    user_id = get_user_id(update)

    if is_group(update):
        group_id = get_group_id(update)
        bounties = TRACKING_SERVICE.get_tracked_bounties(group_id, user_id)
        room_id = group_id
    else:
        room_id = get_room_id(update)
        bounties = BOUNTY_SERVICE.list_bounties(room_id)

    if not bounties:
        msg = (
            "You are not tracking any bounties."
            if is_group(update)
            else "No personal bounties."
        )
        await update.message.reply_text(msg)
        return

    lines = [format_bounty(b, show_id=True, room_id=room_id) for b in bounties]
    await update.message.reply_text("\n".join(lines), disable_web_page_preview=True)


async def cmd_add(update: Update, ctx: ContextTypes.DEFAULT_TYPE) -> None:
    args = extract_args(update.message.text)
    if not args:
        await update.message.reply_text(
            "Usage: /add <text> [link] [due_date]\n"
            "Example: /add Fix the bug https://github.com/foo/bar tomorrow"
        )
        return

    text, link, due_date_ts = parse_args(args)
    if not text and not link:
        await update.message.reply_text("A bounty needs at least text or a link.")
        return

    user_id = get_user_id(update)
    room_id = get_room_id(update)

    bounty = BOUNTY_SERVICE.add_bounty(
        room_id=room_id,
        user_id=user_id,
        text=text,
        link=link,
        due_date_ts=due_date_ts,
    )

    due_str = ""
    if due_date_ts:
        timezone_str = BOUNTY_SERVICE.get_timezone(room_id)
        due_str = f" | Due: {format_due_date(due_date_ts, timezone_str)}"

    await update.message.reply_text(
        f"✅ Bounty added (#{bounty.id}){due_str}",
        disable_web_page_preview=True,
    )


async def cmd_update(update: Update, ctx: ContextTypes.DEFAULT_TYPE) -> None:
    args = extract_args(update.message.text)
    if len(args) < 1:
        await update.message.reply_text(
            "Usage: /update <bounty_id> [text] [link] [due_date]"
        )
        return

    try:
        bounty_id = int(args[0])
    except ValueError:
        await update.message.reply_text("Invalid bounty ID.")
        return

    text, link, due_date_ts = parse_args(args[1:])
    if not text and not link and due_date_ts is None:
        await update.message.reply_text("Nothing to update.")
        return

    user_id = get_user_id(update)
    room_id = get_room_id(update)

    try:
        success = BOUNTY_SERVICE.update_bounty(
            room_id=room_id,
            bounty_id=bounty_id,
            user_id=user_id,
            text=text,
            link=link,
            due_date_ts=due_date_ts,
        )
    except PermissionError as e:
        await update.message.reply_text(f"⛔ {e}")
        return

    if success:
        await update.message.reply_text(f"✅ Bounty #{bounty_id} updated.")
    else:
        await update.message.reply_text("Bounty not found.")


cmd_edit = cmd_update


async def cmd_delete(update: Update, ctx: ContextTypes.DEFAULT_TYPE) -> None:
    args = extract_args(update.message.text)
    if not args:
        await update.message.reply_text("Usage: /delete <bounty_id>")
        return

    try:
        bounty_id = int(args[0])
    except ValueError:
        await update.message.reply_text("Invalid bounty ID.")
        return

    user_id = get_user_id(update)
    room_id = get_room_id(update)

    try:
        success = BOUNTY_SERVICE.delete_bounty(
            room_id=room_id,
            bounty_id=bounty_id,
            user_id=user_id,
        )
    except PermissionError as e:
        await update.message.reply_text(f"⛔ {e}")
        return

    if success:
        await update.message.reply_text(f"✅ Bounty #{bounty_id} deleted.")
    else:
        await update.message.reply_text("Bounty not found.")


async def cmd_track(update: Update, ctx: ContextTypes.DEFAULT_TYPE) -> None:
    if not is_group(update):
        await update.message.reply_text("⛔ /track is only available in groups.")
        return

    args = extract_args(update.message.text)
    if not args:
        await update.message.reply_text("Usage: /track <bounty_id>")
        return

    try:
        bounty_id = int(args[0])
    except ValueError:
        await update.message.reply_text("Invalid bounty ID.")
        return

    user_id = get_user_id(update)
    room_id = get_room_id(update)

    try:
        if TRACKING_SERVICE.track_bounty(room_id, user_id, bounty_id):
            await update.message.reply_text(f"✅ Now tracking bounty #{bounty_id}.")
        else:
            await update.message.reply_text(f"Already tracking bounty #{bounty_id}.")
    except ValueError as e:
        await update.message.reply_text(str(e))


async def cmd_untrack(update: Update, ctx: ContextTypes.DEFAULT_TYPE) -> None:
    if not is_group(update):
        await update.message.reply_text("⛔ /untrack is only available in groups.")
        return

    args = extract_args(update.message.text)
    if not args:
        await update.message.reply_text("Usage: /untrack <bounty_id>")
        return

    try:
        bounty_id = int(args[0])
    except ValueError:
        await update.message.reply_text("Invalid bounty ID.")
        return

    user_id = get_user_id(update)
    room_id = get_room_id(update)

    if TRACKING_SERVICE.untrack_bounty(room_id, user_id, bounty_id):
        await update.message.reply_text(f"✅ Untracked bounty #{bounty_id}.")
    else:
        await update.message.reply_text("Not tracking bounty #{bounty_id}.")


async def cmd_start(update: Update, ctx: ContextTypes.DEFAULT_TYPE) -> None:
    if is_group(update):
        await update.message.reply_text(
            "👻 JIGAIDO is watching.\n\n"
            "This group's bounty list is now active.\n"
            "/bounty — list bounties\n"
            "/add — create a bounty\n"
            "/track — track a bounty\n"
            "/my — your tracked bounties"
        )
    else:
        await update.message.reply_text(
            "👻 JIGAIDO activated.\n\n"
            "Personal bounty list ready.\n"
            "/bounty — list your bounties\n"
            "/add — create a bounty\n"
            "/my — your tracked bounties"
        )


async def cmd_help(update: Update, ctx: ContextTypes.DEFAULT_TYPE) -> None:
    await update.message.reply_text(
        "👻 JIGAIDO Commands:\n\n"
        "/bounty — list all bounties\n"
        "/my — bounties you're tracking\n"
        "/add <text> [link] [due] — add bounty\n"
        "/update <id> [text> [link] [due] — update bounty\n"
        "/delete <id> — delete bounty\n"
        "/track <id> — track a bounty (groups only)\n"
        "/untrack <id> — stop tracking (groups only)\n"
        "/timezone [tz] — get/set room timezone (admin only)\n"
        "/start — re-initialize\n"
        "/help — this message",
        disable_web_page_preview=True,
    )


async def cmd_timezone(update: Update, ctx: ContextTypes.DEFAULT_TYPE) -> None:
    args = extract_args(update.message.text)
    room_id = get_room_id(update)
    user_id = get_user_id(update)

    if not args:
        current_tz = BOUNTY_SERVICE.get_timezone(room_id)
        await update.message.reply_text(f"Current timezone: {current_tz}")
        return

    timezone_str = args[0]

    try:
        ZoneInfo(timezone_str)
    except (KeyError, ZoneInfoNotFoundError):
        await update.message.reply_text(
            "⛔ Invalid timezone. Use IANA format (e.g., Asia/Jakarta)"
        )
        return

    try:
        BOUNTY_SERVICE.set_timezone(room_id, timezone_str, user_id)
    except PermissionError as e:
        await update.message.reply_text(f"⛔ {e}")
        return

    await update.message.reply_text(f"✅ Timezone set to {timezone_str}.")