"""Telegram command handlers for JIGAIDO."""

import json
import os
import re
import time
from functools import wraps
from typing import Optional

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

import storage

TELEGRAM_BOT_USERNAME = "your_bot_username"


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: dict, show_id: bool = True) -> str:
    parts = []
    if show_id:
        parts.append(f"[#{b['id']}]")
    if b.get("text"):
        parts.append(b["text"])
    if b.get("link"):
        parts.append(f"🔗 {b['link']}")
    if b.get("due_date_ts"):
        due_str = time.strftime("%Y-%m-%d", time.localtime(b["due_date_ts"]))
        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.get("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


async def cmd_bounty(update: Update, ctx: ContextTypes.DEFAULT_TYPE) -> None:
    if is_group(update):
        data = storage.load_group_bounties(get_group_id(update))
        bounties = data.get("bounties", [])
    else:
        data = storage.load_user_personal(get_user_id(update))
        bounties = data.get("bounties", [])

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

    lines = [format_bounty(dict(b), show_id=True) 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)
        tracking = storage.load_user_tracking(group_id, user_id)
        tracked = tracking.get("tracked", [])
    else:
        data = storage.load_user_personal(user_id)
        bounties = data.get("bounties", [])
        lines = [format_bounty(dict(b), show_id=True) for b in bounties]
        await update.message.reply_text(
            "\n".join(lines) if lines else "No personal bounties.",
            disable_web_page_preview=True,
        )
        return

    if not tracked:
        await update.message.reply_text("You are not tracking any bounties.")
        return

    group_data = storage.load_group_bounties(group_id)
    bounty_map = {b["id"]: b for b in group_data.get("bounties", [])}

    bounty_lines = []
    for t in tracked:
        bounty = bounty_map.get(t["bounty_id"])
        if bounty:
            bounty_lines.append(format_bounty(bounty, show_id=True))

    if not bounty_lines:
        await update.message.reply_text("You are not tracking any bounties.")
        return

    await update.message.reply_text(
        "\n".join(bounty_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)

    if is_group(update):
        group_id = get_group_id(update)
        bounty = storage.add_group_bounty(group_id, user_id, text, link, due_date_ts)
    else:
        bounty = storage.add_personal_bounty(user_id, text, link, due_date_ts)

    due_str = ""
    if due_date_ts:
        due_str = f" | Due: {time.strftime('%Y-%m-%d', time.localtime(due_date_ts))}"

    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)

    if is_group(update):
        group_id = get_group_id(update)
        bounty = storage.get_group_bounty(group_id, bounty_id)
        if not bounty:
            await update.message.reply_text("Bounty not found.")
            return
        if bounty["created_by_user_id"] != user_id:
            await update.message.reply_text("⛔ Only the creator can edit this bounty.")
            return
        storage.update_group_bounty(group_id, bounty_id, text, link, due_date_ts)
    else:
        bounty = storage.get_personal_bounty(user_id, bounty_id)
        if not bounty:
            await update.message.reply_text("Bounty not found.")
            return
        storage.update_personal_bounty(user_id, bounty_id, text, link, due_date_ts)

    await update.message.reply_text(f"✅ Bounty #{bounty_id} updated.")


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)

    if is_group(update):
        group_id = get_group_id(update)
        bounty = storage.get_group_bounty(group_id, bounty_id)
        if not bounty:
            await update.message.reply_text("Bounty not found.")
            return
        if bounty["created_by_user_id"] != user_id:
            await update.message.reply_text(
                "⛔ Only the creator can delete this bounty."
            )
            return
        storage.delete_group_bounty(group_id, bounty_id)
    else:
        bounty = storage.get_personal_bounty(user_id, bounty_id)
        if not bounty:
            await update.message.reply_text("Bounty not found.")
            return
        storage.delete_personal_bounty(user_id, bounty_id)

    await update.message.reply_text(f"✅ Bounty #{bounty_id} deleted.")


async def cmd_track(update: Update, ctx: ContextTypes.DEFAULT_TYPE) -> None:
    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)

    if is_group(update):
        group_id = get_group_id(update)
        bounty = storage.get_group_bounty(group_id, bounty_id)
        if not bounty:
            await update.message.reply_text("Bounty not found.")
            return
        if storage.track_bounty(group_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}.")
    else:
        if storage.track_bounty(user_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}.")


async def cmd_untrack(update: Update, ctx: ContextTypes.DEFAULT_TYPE) -> None:
    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)

    if is_group(update):
        group_id = get_group_id(update)
        if storage.untrack_bounty(group_id, user_id, bounty_id):
            await update.message.reply_text(f"✅ Untracked bounty #{bounty_id}.")
        else:
            await update.message.reply_text(f"Not tracking bounty #{bounty_id}.")
    else:
        if storage.untrack_bounty(user_id, user_id, bounty_id):
            await update.message.reply_text(f"✅ Untracked bounty #{bounty_id}.")
        else:
            await update.message.reply_text(f"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\n"
        "/untrack <id> — stop tracking\n"
        "/start — re-initialize\n"
        "/help — this message",
        disable_web_page_preview=True,
    )