"""
Обработчики просмотра заявок (Intradesk API).

Заявки загружаются из Intradesk API по нажатию кнопки — только незакрытые.
Навигация через callback payload:
  "view_tickets"          → список, страница 0
  "itickets_page:{n}"    → список, страница n
  "iticket_detail:{id}"  → карточка задачи (из кэша в context)
  "main_menu"            → в menu.py
"""
from __future__ import annotations

import re
import time

from maxapi.context import BaseContext
from maxapi.dispatcher import Router
from maxapi.filters import F
from maxapi.types.updates.message_callback import MessageCallback

import config
from bot.filters import PayloadStartsWith
from bot.flow_config import PAYLOADS, TRANSITIONS
from bot.handlers.create_ticket import _extract_attachments
from bot.keyboards import comment_input_kb, iticket_detail_kb, main_menu_kb, menu_only_kb
from bot.nav_helper import nav_finish, nav_prepare, nav_set
from bot.send_helper import bot_send
from bot.texts import CommentTexts, TicketDetailTexts, TicketListTexts
from database.connection import get_db
from database.queries.intradesk import get_intradesk_contact_id_for_phone
from database.queries.organizations import get_organization
from external.intradesk_api import (
    add_task_comment,
    close_task,
    get_client_open_tasks,
    get_task_comments,
    get_task_last_comment,
    invalidate_client_cache,
    invalidate_task_comment,
    upload_attachments,
)

router = Router(router_id="view_tickets")

_PAGE_SIZE = 5


def _status_icon(status_name: str) -> str:
    sn = status_name.lower()
    if "выполнен" in sn or "закрыт" in sn:
        return "🟢"
    if "работ" in sn:
        return "🟡"
    if "открыт" in sn:
        return "🔴"
    return "⚪"


def _fmt_date(iso: str) -> str:
    """'2026-03-26T09:57:11Z' → '26.03.2026 09:57'"""
    if not iso or len(iso) < 10:
        return iso or "—"
    y, m, d = iso[:10].split("-")
    # iso может быть "2026-03-26T09:57:11Z" или "2026-03-26 09:57"
    time_part = iso[11:16] if len(iso) >= 16 else ""
    return f"{d}.{m}.{y}" + (f" {time_part}" if time_part else "")


def _fmt_date_short(iso: str) -> str:
    """'2026-03-26 11:54' → '26.03 11:54'"""
    if not iso or len(iso) < 10:
        return iso or ""
    y, m, d = iso[:10].split("-")
    time_part = iso[11:16] if len(iso) >= 16 else ""
    return f"{d}.{m}" + (f" {time_part}" if time_part else "")


def _build_tasks_text(tasks: list[dict], page: int, total: int) -> str:
    pages = max(1, -(-total // _PAGE_SIZE))
    lines = [TicketListTexts.HEADER.format(total=total, page=page + 1, pages=pages)]

    for t in tasks:
        icon = _status_icon(t.get("status_name") or "")
        num = t.get("task_number") or t.get("id") or "?"
        name = (t.get("name") or "—")[:60]
        created = _fmt_date(t.get("created_at") or "")
        status = t.get("status_name") or "—"

        lines += [
            "",
            "─" * 20,
            f"📌 №{num} · {created}",
            f"{name}",
            f"{icon} {status}",
        ]

        comment = t.get("last_comment")
        if comment and comment.get("text"):
            ctext = comment["text"][:80] + ("…" if len(comment["text"]) > 80 else "")
            author_short = (comment.get("author") or "—").split()[0]
            cdate = _fmt_date_short(comment.get("date") or "")
            lines.append(f'💬 "{ctext}" — {author_short} ({cdate})')
        else:
            lines.append(TicketListTexts.NO_COMMENTS)

    return "\n".join(lines)


async def _delete_msg(bot, mid: str | None) -> None:
    """Тихо удалить сообщение по mid."""
    if not mid:
        return
    try:
        await bot.delete_message(message_id=mid)
    except Exception:
        pass


async def _load_and_show(
    event: MessageCallback,
    bot_user: dict,
    page: int,
    context: BaseContext,
    nav_mid: str | None = None,
) -> None:
    """
    Загрузить страницу заявок из API и показать.

    nav_mid — уже отображённый индикатор загрузки (из nav_prepare).
    Если None — отправляет новое сообщение самостоятельно.
    Редактирует nav_mid результатом; перед рендером проверяет load_token.
    """
    org_id = bot_user.get("org_id")
    intradesk_client_id: int | None = None
    if org_id:
        org = await get_organization(org_id)
        intradesk_client_id = org.get("intradesk_id") if org else None

    token = str(time.monotonic_ns())
    chat_id = event.message.recipient.chat_id if event.message else None

    # Если nav_mid не задан — отправляем loading сами
    if not nav_mid:
        nav_mid = await bot_send(
            event.bot,
            chat_id=chat_id,
            user_id=bot_user["max_user_id"],
            text=TicketListTexts.LOADING,
            attachments=[],
        )

    # Сохраняем токен и nav_mid (остальные ключи контекста пока не важны)
    data = await context.get_data()
    data.update({"load_token": token, "nav_mid": nav_mid})
    await context.set_data(data)

    if not intradesk_client_id:
        data = await context.get_data()
        if data.get("load_token") != token:
            await _delete_msg(event.bot, nav_mid)
            return
        await _edit_or_send(event.bot, nav_mid, chat_id,
            text=TicketListTexts.NO_ORG,
            attachments=[menu_only_kb()])
        return

    # Запрос к API
    result = await get_client_open_tasks(intradesk_client_id, page=page, page_size=_PAGE_SIZE)
    tasks = result["tasks"]
    total = result["total"]

    # Проверяем токен — не ушёл ли пользователь пока грузили
    data = await context.get_data()
    if data.get("load_token") != token:
        await _delete_msg(event.bot, nav_mid)
        return

    # Сохраняем задачи в контексте для детального просмотра
    data.update({"tasks": tasks, "page": page, "total": total, "nav_mid": nav_mid})
    await context.set_data(data)

    if not tasks:
        await _edit_or_send(event.bot, nav_mid, chat_id,
            text=TicketListTexts.EMPTY,
            attachments=[menu_only_kb()])
        return

    from bot.keyboards import intradesk_tasks_list_kb
    text = _build_tasks_text(tasks, page, total)
    kb = intradesk_tasks_list_kb(tasks, page=page, total=total, page_size=_PAGE_SIZE)
    await _edit_or_send(event.bot, nav_mid, chat_id, text=text, attachments=[kb])


async def _edit_or_send(bot, mid: str | None, chat_id: int | None, *, text: str, attachments) -> None:
    """Редактировать сообщение по mid или отправить новое если mid недоступен."""
    if mid:
        try:
            await bot.edit_message(
                message_id=mid,
                text=text,
                attachments=attachments if attachments is not None else [],
            )
            return
        except Exception:
            pass
    if chat_id:
        await bot.send_message(chat_id=chat_id, text=text, attachments=attachments or [])


@router.message_callback(F.callback.payload == PAYLOADS.VIEW_TICKETS)
async def cb_view_tickets(
    event: MessageCallback, context: BaseContext, bot_user: dict
) -> None:
    from bot.handlers.create_ticket import cleanup_ticket_flow
    await cleanup_ticket_flow(event.bot, context)
    await event.answer(notification="")

    chat_id = event.message.recipient.chat_id if event.message else None
    nav_mid = await nav_prepare(
        event, context,
        loading_text=TicketListTexts.LOADING,
        chat_id=chat_id,
        user_id=bot_user["max_user_id"],
    )
    await _load_and_show(event, bot_user, page=0, context=context, nav_mid=nav_mid)


@router.message_callback(PayloadStartsWith(PAYLOADS.PFX_ITICKETS_PAGE))
async def cb_itickets_page(
    event: MessageCallback, context: BaseContext, bot_user: dict
) -> None:
    await event.answer(notification="")
    try:
        page = int(event.callback.payload.split(":")[1])
    except (IndexError, ValueError):
        page = 0

    chat_id = event.message.recipient.chat_id if event.message else None
    nav_mid = await nav_prepare(
        event, context,
        loading_text=TicketListTexts.LOADING,
        chat_id=chat_id,
        user_id=bot_user["max_user_id"],
    )
    await _load_and_show(event, bot_user, page=page, context=context, nav_mid=nav_mid)


@router.message_callback(PayloadStartsWith(PAYLOADS.PFX_ITICKET_DETAIL))
async def cb_iticket_detail(
    event: MessageCallback, context: BaseContext, bot_user: dict
) -> None:
    try:
        task_id = int(event.callback.payload.split(":")[1])
    except (IndexError, ValueError):
        await event.answer(notification=TicketDetailTexts.GENERIC_ERROR)
        return

    await event.answer(notification="")
    chat_id = event.message.recipient.chat_id if event.message else None

    # Если пришли сюда из комментарийного флоу (кнопка «Назад») —
    # удаляем промпт-сообщение и сбрасываем state, сохраняя кэш задач.
    state = await context.get_state()
    if state == TRANSITIONS["comment:start"]:
        d = await context.get_data()
        for mid in (d.get("flow_message_ids") or []):
            await _delete_msg(event.bot, mid)
        await context.set_state(TRANSITIONS["comment:done"])
        # Сохраняем кэш задач, но сбрасываем nav_mid (промпт уже удалён)
        await context.set_data({
            "tasks": d.get("tasks"),
            "page": d.get("page"),
            "total": d.get("total"),
        })

    # Показываем ⏳ (edit-in-place если меню/список последнее, иначе новое)
    nav_mid = await nav_prepare(
        event, context,
        loading_text=TicketDetailTexts.LOADING,
        chat_id=chat_id,
        user_id=bot_user["max_user_id"],
    )

    # Ищем задачу в кэше контекста (загружена при показе списка)
    data = await context.get_data()
    task = next((t for t in (data.get("tasks") or []) if t.get("id") == task_id), None)

    if task is None:
        await nav_finish(
            event.bot, context, nav_mid, chat_id, bot_user["max_user_id"],
            text=TicketDetailTexts.NOT_FOUND,
            attachments=[iticket_detail_kb()],
        )
        return

    icon = _status_icon(task.get("status_name") or "")
    num = task.get("task_number") or task["id"]

    lines = [
        f"📌 Заявка #{num}",
        f"Статус: {icon} {task.get('status_name') or '—'}",
        f"Создана: {_fmt_date(task.get('created_at') or '')}",
        f"Обновлена: {_fmt_date(task.get('updated_at') or '')}",
    ]
    if task.get("name"):
        lines += ["", f"📄 {task['name']}"]

    if task.get("description"):
        desc = task["description"]
        if len(desc) > 600:
            desc = desc[:600] + "…"
        lines += ["", TicketDetailTexts.DESCRIPTION_HEADER, desc]

    # Последние 10 комментариев из history API
    comments = await get_task_comments(task["id"], count=10)
    if comments:
        lines += ["", TicketDetailTexts.COMMENTS_HEADER.format(count=len(comments))]
        for c in comments:
            ctext = c["text"]
            if len(ctext) > 300:
                ctext = ctext[:300] + "…"
            lines += [
                "",
                "─" * 16,
                f"{c['date']} — {c['author']}",
                ctext,
            ]
    else:
        lines += ["", TicketDetailTexts.NO_COMMENTS]

    await nav_finish(
        event.bot, context, nav_mid, chat_id, bot_user["max_user_id"],
        text="\n".join(lines),
        attachments=[iticket_detail_kb(task_id=task["id"], can_close=bool(config.INTRADESK_CLOSE_STATUS_ID))],
    )

    from database.queries.reply_context import set_reply_context
    await set_reply_context(bot_user["max_user_id"], task_id, task.get("task_number"))


# ── Закрыть заявку ────────────────────────────────────────────────────────────

@router.message_callback(PayloadStartsWith(PAYLOADS.PFX_ITICKET_CLOSE))
async def cb_close_ticket(
    event: MessageCallback, context: BaseContext, bot_user: dict
) -> None:
    try:
        task_id = int(event.callback.payload.split(":")[1])
    except (IndexError, ValueError):
        await event.answer(notification=TicketDetailTexts.GENERIC_ERROR)
        return

    await event.answer(notification="")

    # Ищем задачу в кэше
    data = await context.get_data()
    task = next((t for t in (data.get("tasks") or []) if t.get("id") == task_id), None)
    task_number = task.get("task_number") if task else None

    chat_id = event.message.recipient.chat_id if event.message else None

    if not task_number:
        nav_mid = await nav_prepare(
            event, context,
            loading_text=TicketDetailTexts.CLOSING,
            chat_id=chat_id,
            user_id=bot_user["max_user_id"],
        )
        await nav_finish(
            event.bot, context, nav_mid, chat_id, bot_user["max_user_id"],
            text=TicketDetailTexts.CLOSE_NUMBER_ERROR,
            attachments=[iticket_detail_kb()],
        )
        return

    nav_mid = await nav_prepare(
        event, context,
        loading_text=TicketDetailTexts.CLOSING,
        chat_id=chat_id,
        user_id=bot_user["max_user_id"],
    )

    # Получаем contact_person_id
    intradesk_id: int | None = None
    contact_person_id: int | None = None
    if bot_user.get("org_id"):
        org = await get_organization(bot_user["org_id"])
        intradesk_id = org.get("intradesk_id") if org else None
        if intradesk_id and bot_user.get("phone"):
            db = get_db()
            contact_person_id = await get_intradesk_contact_id_for_phone(
                db, intradesk_id, bot_user["phone"]
            )

    ok = await close_task(task_number=task_number, contact_person_id=contact_person_id)

    if ok:
        # Сбрасываем кэш — задача теперь закрыта
        invalidate_task_comment(task_id)
        if intradesk_id:
            invalidate_client_cache(intradesk_id)
        num_str = f" #{task_number}" if task_number else ""
        await nav_finish(
            event.bot, context, nav_mid, chat_id, bot_user["max_user_id"],
            text=TicketDetailTexts.CLOSED.format(num_str=num_str),
            attachments=[menu_only_kb()],
        )
    else:
        await nav_finish(
            event.bot, context, nav_mid, chat_id, bot_user["max_user_id"],
            text=TicketDetailTexts.CLOSE_ERROR,
            attachments=[iticket_detail_kb(task_id=task_id, can_close=bool(config.INTRADESK_CLOSE_STATUS_ID))],
        )


# ── Оставить комментарий ──────────────────────────────────────────────────────

@router.message_callback(PayloadStartsWith(PAYLOADS.PFX_ITICKET_COMMENT))
async def cb_add_comment(
    event: MessageCallback, context: BaseContext, bot_user: dict
) -> None:
    # Защита от спама: если уже в режиме ввода комментария — игнорируем повторный клик
    state = await context.get_state()
    if state == TRANSITIONS["comment:start"]:
        await event.answer(notification="")
        return

    try:
        task_id = int(event.callback.payload.split(":")[1])
    except (IndexError, ValueError):
        await event.answer(notification=TicketDetailTexts.GENERIC_ERROR)
        return

    await event.answer(notification="")

    # Ищем task_number в кэше контекста; сохраняем кэш задач для кнопки «Назад»
    data = await context.get_data()
    task = next((t for t in (data.get("tasks") or []) if t.get("id") == task_id), None)
    task_number = task.get("task_number") if task else None

    await context.set_state(TRANSITIONS["comment:start"])
    await context.set_data({
        "comment_task_id": task_id,
        "comment_task_number": task_number,
        "flow_message_ids": [],
        # Сохраняем кэш списка чтобы кнопка «Назад» нашла задачу
        "tasks": data.get("tasks"),
        "page": data.get("page"),
        "total": data.get("total"),
    })

    chat_id = event.message.recipient.chat_id if event.message else None
    if chat_id is None:
        return

    num_str = f" к заявке #{task_number}" if task_number else ""
    mid = await bot_send(
        event.bot,
        chat_id=chat_id,
        user_id=bot_user["max_user_id"],
        text=CommentTexts.PROMPT.format(num_str=num_str),
        attachments=[comment_input_kb(task_id)],
    )
    # Сохраняем mid для возможной очистки
    if mid:
        d = await context.get_data()
        d["flow_message_ids"] = [mid]
        await context.set_data(d)


@router.message_created(states=TRANSITIONS["comment:start"])
async def on_comment_text(
    event, context: BaseContext, bot_user: dict
) -> None:
    chat_id, user_id = event.get_ids()
    if chat_id is None:
        return

    body = event.message.body
    text = (body.text or "").strip() if body else ""
    file_atts = _extract_attachments(event)

    if not text and not file_atts:
        await bot_send(
            event.bot,
            chat_id=chat_id,
            user_id=user_id,
            text=CommentTexts.EMPTY_ERROR,
            attachments=[menu_only_kb()],
        )
        return

    data = await context.get_data()
    task_id = data.get("comment_task_id")
    task_number = data.get("comment_task_number")

    # Сбрасываем состояние до отправки API — защита от повторов
    await context.clear()

    # Получаем данные организации (нужны и для contact_person_id, и для инвалидации кэша)
    intradesk_id: int | None = None
    contact_person_id: int | None = None
    if bot_user.get("org_id"):
        org = await get_organization(bot_user["org_id"])
        intradesk_id = org.get("intradesk_id") if org else None
        if intradesk_id and bot_user.get("phone"):
            db = get_db()
            contact_person_id = await get_intradesk_contact_id_for_phone(
                db, intradesk_id, bot_user["phone"]
            )

    # Загружаем файлы в Intradesk (target=Comment, task_id=Intradesk внутренний ID)
    if file_atts:
        file_atts = await upload_attachments(
            file_atts, task_id=task_id or 0, target="Comment"
        )

    comment_text = text or CommentTexts.FILE_ONLY

    ok = await add_task_comment(
        task_number=task_number,
        text=comment_text,
        contact_person_id=contact_person_id,
        attachments=file_atts or None,
    )

    if ok:
        # Сбрасываем кэш — следующий переход в меню/список покажет свежие данные
        if task_id:
            invalidate_task_comment(task_id)
        if intradesk_id:
            invalidate_client_cache(intradesk_id)

    num_str = f" к заявке #{task_number}" if task_number else ""
    result_text = CommentTexts.SUCCESS.format(num_str=num_str) if ok else CommentTexts.ERROR

    menu_mid = await bot_send(
        event.bot,
        chat_id=chat_id,
        user_id=user_id,
        text=result_text,
        attachments=[main_menu_kb()],
    )
    await nav_set(context, menu_mid)