import type { Context } from "grammy";
import { InlineKeyboard } from "grammy";
import { rm } from "node:fs/promises";
import { join } from "node:path";
import { eq } from "drizzle-orm";
import { whatsappAccounts } from "@cmbot/db";
import { db } from "../db.js";
import { env } from "../env.js";
import { logger } from "../logger.js";
import { sessionManager } from "../whatsapp/session-manager.js";
import { writeAuditLog } from "../audit.js";
import { setPendingPairLabel, setPendingSendToGroup, startWizard, getWizard, updateWizard, clearWizard } from "./state.js";
import { sendTextToGroup } from "../whatsapp/sender.js";
import { syncGroupsForAccount } from "../whatsapp/group-sync.js";
import {
  mainMenu,
  helpMenu,
  pairPromptMenu,
  accountsMenu,
  accountDetailMenu,
  groupsListMenu,
  groupDetailMenu,
  sendTestPromptMenu,
  sendTestDoneMenu,
  unpairConfirmMenu,
  unpairDoneMenu,
  remindersMenu,
  reminderDetailMenu,
  reminderPickAccountMenu,
  reminderPickGroupMenu,
  reminderComposeMenu,
  reminderTimeMenu,
  reminderConfirmMenu,
  type MenuView,
} from "./menus.js";
import { createReminder, deleteReminder, getReminderWithDetails } from "../reminders/crud.js";
import { quickToDate, type Quick } from "../reminders/time-parsing.js";
import { scheduleReminderFire, cancelReminderFire } from "../scheduler/reminder-jobs.js";
import { getBoss } from "../scheduler/pgboss-client.js";
import { DEFAULT_TIMEZONE } from "@cmbot/shared";
import { DateTime } from "luxon";

async function findOperator(ctx: Context) {
  const tgId = ctx.from?.id;
  if (!tgId) return null;
  return db.query.operators.findFirst({
    where: (o, { eq }) => eq(o.telegramUserId, tgId),
  });
}

// Edit the current message to render a new menu view. Falls back to a fresh
// reply if the previous message can't be edited (e.g. a photo message -- Telegram
// won't let us turn it back into a text message).
async function showMenu(ctx: Context, view: MenuView): Promise<void> {
  // Default to Markdown parse mode unless the menu explicitly opts out.
  // Views with user-supplied content set `parseMode: undefined` to render plain.
  const parseMode = "parseMode" in view ? view.parseMode : "Markdown";
  try {
    await ctx.editMessageText(view.text, {
      reply_markup: view.keyboard,
      parse_mode: parseMode,
    });
  } catch (err) {
    logger.debug({ err }, "showMenu: edit failed, sending fresh message");
    await ctx.reply(view.text, {
      reply_markup: view.keyboard,
      parse_mode: parseMode,
    });
  }
}

export async function showMainMenu(ctx: Context): Promise<void> {
  await showMenu(ctx, mainMenu());
}

export async function showHelpMenu(ctx: Context): Promise<void> {
  await ctx.answerCallbackQuery();
  await showMenu(ctx, helpMenu());
}

export async function showAccountsMenu(ctx: Context): Promise<void> {
  await ctx.answerCallbackQuery();
  const op = await findOperator(ctx);
  if (!op) return;
  const view = await accountsMenu(op.id);
  await showMenu(ctx, view);
}

export async function showAccountDetail(ctx: Context, accountId: string): Promise<void> {
  await ctx.answerCallbackQuery();
  const op = await findOperator(ctx);
  if (!op) return;
  const view = await accountDetailMenu(op.id, accountId);
  if (!view) {
    await ctx.answerCallbackQuery({ text: "Account not found.", show_alert: true });
    return;
  }
  await showMenu(ctx, view);
}

export async function showGroupsList(ctx: Context, accountId: string): Promise<void> {
  await ctx.answerCallbackQuery();
  const op = await findOperator(ctx);
  if (!op) return;
  const view = await groupsListMenu(op.id, accountId);
  if (!view) {
    await ctx.answerCallbackQuery({ text: "Account not found.", show_alert: true });
    return;
  }
  await showMenu(ctx, view);
}

export async function refreshGroupsList(ctx: Context, accountId: string): Promise<void> {
  const op = await findOperator(ctx);
  if (!op) {
    await ctx.answerCallbackQuery();
    return;
  }
  const account = await db.query.whatsappAccounts.findFirst({
    where: (a, { eq, and }) => and(eq(a.id, accountId), eq(a.operatorId, op.id)),
  });
  if (!account) {
    await ctx.answerCallbackQuery({ text: "Account not found.", show_alert: true });
    return;
  }
  const session = sessionManager.getSession(accountId);
  if (!session) {
    await ctx.answerCallbackQuery({
      text: "Account not connected. Re-pair first.",
      show_alert: true,
    });
    return;
  }
  await ctx.answerCallbackQuery({ text: "Refreshing…" });
  try {
    const result = await syncGroupsForAccount(accountId, session.socket);
    logger.info({ accountId, count: result.synced }, "refreshGroupsList: ok");
  } catch (err) {
    logger.error({ err, accountId }, "refreshGroupsList: failed");
  }
  const view = await groupsListMenu(op.id, accountId);
  if (view) await showMenu(ctx, view);
}

export async function showUnpairConfirm(ctx: Context, accountId: string): Promise<void> {
  await ctx.answerCallbackQuery();
  const op = await findOperator(ctx);
  if (!op) return;
  const view = await unpairConfirmMenu(op.id, accountId);
  if (!view) {
    await ctx.answerCallbackQuery({ text: "Account not found.", show_alert: true });
    return;
  }
  await showMenu(ctx, view);
}

export async function executeUnpair(ctx: Context, accountId: string): Promise<void> {
  const op = await findOperator(ctx);
  if (!op) {
    await ctx.answerCallbackQuery();
    return;
  }
  const account = await db.query.whatsappAccounts.findFirst({
    where: (a, { eq, and }) => and(eq(a.id, accountId), eq(a.operatorId, op.id)),
  });
  if (!account) {
    await ctx.answerCallbackQuery({ text: "Account not found.", show_alert: true });
    return;
  }
  await sessionManager.stop(accountId);
  await rm(join(env.SESSIONS_DIR, accountId), { recursive: true, force: true });
  await db
    .update(whatsappAccounts)
    .set({ status: "logged_out", phoneNumber: null })
    .where(eq(whatsappAccounts.id, accountId));
  await writeAuditLog(db, {
    operatorId: op.id,
    source: "telegram",
    action: "account.unpaired",
    targetType: "whatsapp_account",
    targetId: accountId,
    payload: { label: account.label, via: "menu" },
  });
  await ctx.answerCallbackQuery({ text: "Unpaired." });
  await showMenu(ctx, unpairDoneMenu(account.label));
}

export async function showPairPrompt(ctx: Context): Promise<void> {
  await ctx.answerCallbackQuery();
  const userId = ctx.from?.id;
  if (userId) setPendingPairLabel(userId);
  await showMenu(ctx, pairPromptMenu());
}

export async function showGroupDetail(ctx: Context, groupId: string): Promise<void> {
  await ctx.answerCallbackQuery();
  const op = await findOperator(ctx);
  if (!op) return;
  const view = await groupDetailMenu(op.id, groupId);
  if (!view) {
    await ctx.answerCallbackQuery({ text: "Group not found.", show_alert: true });
    return;
  }
  await showMenu(ctx, view);
}

export async function showSendTestPrompt(ctx: Context, groupId: string): Promise<void> {
  await ctx.answerCallbackQuery();
  const op = await findOperator(ctx);
  if (!op) return;
  const group = await db.query.whatsappGroups.findFirst({
    where: (g, { eq }) => eq(g.id, groupId),
  });
  if (!group) {
    await ctx.answerCallbackQuery({ text: "Group not found.", show_alert: true });
    return;
  }
  // Verify the group's account belongs to this operator before stashing state.
  const account = await db.query.whatsappAccounts.findFirst({
    where: (a, { eq, and }) => and(eq(a.id, group.accountId), eq(a.operatorId, op.id)),
  });
  if (!account) {
    await ctx.answerCallbackQuery({ text: "Group not found.", show_alert: true });
    return;
  }
  const userId = ctx.from?.id;
  if (userId) setPendingSendToGroup(userId, groupId);
  await showMenu(ctx, sendTestPromptMenu(group.name));
}

export async function executeSendTest(
  ctx: Context,
  groupId: string,
  text: string,
): Promise<void> {
  const op = await findOperator(ctx);
  if (!op) return;
  const group = await db.query.whatsappGroups.findFirst({
    where: (g, { eq }) => eq(g.id, groupId),
  });
  if (!group) {
    await ctx.reply("Group not found.");
    return;
  }
  const session = sessionManager.getSession(group.accountId);
  if (!session) {
    await ctx.reply("That account isn't currently connected. Re-pair it first.", {
      reply_markup: sendTestDoneMenu(group.name, false, "session not connected").keyboard,
    });
    return;
  }
  try {
    const result = await sendTextToGroup(session.socket, group.waGroupJid, text);
    await writeAuditLog(db, {
      operatorId: op.id,
      source: "telegram",
      action: "group.send_test",
      targetType: "whatsapp_group",
      targetId: groupId,
      payload: { groupName: group.name, length: text.length, waMessageId: result.messageId ?? null },
    });
    const view = sendTestDoneMenu(group.name, true);
    await ctx.reply(view.text, { reply_markup: view.keyboard, parse_mode: "Markdown" });
  } catch (err) {
    logger.error({ err, groupId }, "send-test: failed");
    const view = sendTestDoneMenu(group.name, false, (err as Error).message);
    await ctx.reply(view.text, { reply_markup: view.keyboard, parse_mode: "Markdown" });
  }
}

export async function showRemindersMenu(ctx: Context): Promise<void> {
  await ctx.answerCallbackQuery();
  const op = await findOperator(ctx);
  if (!op) return;
  const view = await remindersMenu(op.id, op.defaultTimezone ?? DEFAULT_TIMEZONE);
  await showMenu(ctx, view);
}

export async function showReminderDetail(ctx: Context, reminderId: string): Promise<void> {
  await ctx.answerCallbackQuery();
  const op = await findOperator(ctx);
  if (!op) return;
  const view = await reminderDetailMenu(reminderId, op.defaultTimezone ?? DEFAULT_TIMEZONE);
  if (!view) {
    await ctx.answerCallbackQuery({ text: "Reminder not found.", show_alert: true });
    return;
  }
  await showMenu(ctx, view);
}

export async function deleteReminderCallback(ctx: Context, reminderId: string): Promise<void> {
  const op = await findOperator(ctx);
  if (!op) {
    await ctx.answerCallbackQuery();
    return;
  }
  const rem = await getReminderWithDetails(reminderId);
  if (!rem) {
    await ctx.answerCallbackQuery({ text: "Reminder not found.", show_alert: true });
    return;
  }
  await deleteReminder(reminderId);
  await cancelReminderFire(getBoss(), reminderId);
  await writeAuditLog(db, {
    operatorId: op.id,
    source: "telegram",
    action: "reminder.deleted",
    targetType: "reminder",
    targetId: reminderId,
    payload: { name: rem.name },
  });
  await ctx.answerCallbackQuery({ text: "Deleted." });
  await showRemindersMenu(ctx);
}

export async function startReminderWizard(ctx: Context): Promise<void> {
  await ctx.answerCallbackQuery();
  const op = await findOperator(ctx);
  if (!op) return;
  const userId = ctx.from?.id;
  if (!userId) return;
  startWizard(userId);

  const accounts = await db.query.whatsappAccounts.findMany({
    where: (a, { eq }) => eq(a.operatorId, op.id),
    orderBy: (a, { asc }) => [asc(a.label)],
  });
  if (accounts.length === 0) {
    await showMenu(ctx, {
      text: "You need to pair an account before scheduling a reminder.",
      keyboard: new InlineKeyboard().text("⬅ Reminders", "m:reminders"),
    });
    return;
  }
  await showMenu(ctx, reminderPickAccountMenu(accounts));
}

export async function wizardPickAccount(ctx: Context, accountId: string): Promise<void> {
  await ctx.answerCallbackQuery();
  const userId = ctx.from?.id;
  if (!userId) return;
  updateWizard(userId, { step: "pick_group", accountId });
  const groups = await db.query.whatsappGroups.findMany({
    where: (g, { eq }) => eq(g.accountId, accountId),
    orderBy: (g, { asc }) => [asc(g.name)],
  });
  await showMenu(ctx, reminderPickGroupMenu(groups));
}

export async function wizardPickGroup(ctx: Context, groupId: string): Promise<void> {
  await ctx.answerCallbackQuery();
  const userId = ctx.from?.id;
  if (!userId) return;
  updateWizard(userId, { step: "compose", groupId });
  await showMenu(ctx, reminderComposeMenu());
}

export async function wizardSetTimeQuick(ctx: Context, quick: Quick): Promise<void> {
  await ctx.answerCallbackQuery();
  const userId = ctx.from?.id;
  if (!userId) return;
  const w = getWizard(userId);
  if (!w) {
    await ctx.reply("Wizard expired. Tap /menu to start again.");
    return;
  }
  const op = await findOperator(ctx);
  const tz = op?.defaultTimezone ?? DEFAULT_TIMEZONE;
  const date = quickToDate(quick, tz);
  updateWizard(userId, { step: "confirm", scheduledAt: date });
  await showWizardConfirm(ctx);
}

export async function wizardSetTimeCustomPrompt(ctx: Context): Promise<void> {
  await ctx.answerCallbackQuery();
  const userId = ctx.from?.id;
  if (!userId) return;
  updateWizard(userId, { step: "set_time" });
  const op = await findOperator(ctx);
  const tz = op?.defaultTimezone ?? DEFAULT_TIMEZONE;
  const { reminderPickDayMenu } = await import("./menus.js");
  await showMenu(ctx, reminderPickDayMenu(tz));
}

export async function wizardBackToTimeMenu(ctx: Context): Promise<void> {
  await ctx.answerCallbackQuery();
  const { reminderTimeMenu } = await import("./menus.js");
  await showMenu(ctx, reminderTimeMenu());
}

export async function wizardPickDay(ctx: Context, dayOffset: number): Promise<void> {
  await ctx.answerCallbackQuery();
  const userId = ctx.from?.id;
  if (!userId) return;
  const op = await findOperator(ctx);
  const tz = op?.defaultTimezone ?? DEFAULT_TIMEZONE;
  const { reminderPickHourMenu } = await import("./menus.js");
  const { formatCustomDay } = await import("../reminders/time-parsing.js");
  await showMenu(ctx, reminderPickHourMenu(formatCustomDay(dayOffset, tz), dayOffset));
}

export async function wizardPickHour(
  ctx: Context,
  dayOffset: number,
  hour: number,
): Promise<void> {
  await ctx.answerCallbackQuery();
  const userId = ctx.from?.id;
  if (!userId) return;
  const op = await findOperator(ctx);
  const tz = op?.defaultTimezone ?? DEFAULT_TIMEZONE;
  const { reminderPickMinuteMenu } = await import("./menus.js");
  const { formatCustomDay } = await import("../reminders/time-parsing.js");
  await showMenu(ctx, reminderPickMinuteMenu(formatCustomDay(dayOffset, tz), dayOffset, hour));
}

export async function wizardPickMinute(
  ctx: Context,
  dayOffset: number,
  hour: number,
  minute: number,
): Promise<void> {
  const userId = ctx.from?.id;
  if (!userId) {
    await ctx.answerCallbackQuery();
    return;
  }
  const op = await findOperator(ctx);
  const tz = op?.defaultTimezone ?? DEFAULT_TIMEZONE;
  const { buildCustomDate } = await import("../reminders/time-parsing.js");
  const result = buildCustomDate(dayOffset, hour, minute, tz);
  if (!result.ok) {
    await ctx.answerCallbackQuery({ text: result.reason, show_alert: true });
    return;
  }
  await ctx.answerCallbackQuery();
  updateWizard(userId, { step: "confirm", scheduledAt: result.date });
  await showWizardConfirm(ctx);
}

export async function showWizardConfirm(ctx: Context): Promise<void> {
  const userId = ctx.from?.id;
  if (!userId) return;
  const w = getWizard(userId);
  if (!w || !w.accountId || !w.groupId || !w.scheduledAt) {
    await ctx.reply("Wizard incomplete. Tap /menu and try again.");
    return;
  }
  const op = await findOperator(ctx);
  if (!op) return;
  const account = await db.query.whatsappAccounts.findFirst({
    where: (a, { eq, and }) => and(eq(a.id, w.accountId!), eq(a.operatorId, op.id)),
  });
  const group = await db.query.whatsappGroups.findFirst({
    where: (g, { eq }) => eq(g.id, w.groupId!),
  });
  if (!account || !group) {
    await ctx.reply("Account or group missing. Tap /menu and try again.");
    return;
  }
  const tz = op.defaultTimezone ?? DEFAULT_TIMEZONE;
  const whenLocal = DateTime.fromJSDate(w.scheduledAt).setZone(tz).toFormat("yyyy-MM-dd HH:mm");
  const body = w.text || (w.mediaId ? `(media${w.caption ? ` — ${w.caption}` : ""})` : "(empty)");
  await showMenu(ctx, reminderConfirmMenu({
    accountLabel: account.label,
    groupName: group.name,
    body,
    whenLocal: `${whenLocal} (${tz})`,
  }));
}

export async function wizardSave(ctx: Context): Promise<void> {
  await ctx.answerCallbackQuery();
  const userId = ctx.from?.id;
  if (!userId) return;
  const w = getWizard(userId);
  if (!w || !w.accountId || !w.groupId || !w.scheduledAt) {
    await ctx.reply("Wizard incomplete. Tap /menu and try again.");
    return;
  }
  const op = await findOperator(ctx);
  if (!op) return;
  const reminderId = await createReminder({
    accountId: w.accountId,
    groupId: w.groupId,
    name: (w.text ?? w.caption ?? "Reminder").slice(0, 50),
    scheduledAt: w.scheduledAt,
    text: w.text ?? null,
    mediaId: w.mediaId ?? null,
    caption: w.caption ?? null,
    createdBy: op.id,
    timezone: op.defaultTimezone ?? DEFAULT_TIMEZONE,
  });
  await scheduleReminderFire(getBoss(), reminderId, w.scheduledAt);
  await writeAuditLog(db, {
    operatorId: op.id,
    source: "telegram",
    action: "reminder.created",
    targetType: "reminder",
    targetId: reminderId,
    payload: { scheduledAt: w.scheduledAt.toISOString() },
  });
  clearWizard(userId);
  await ctx.reply(`✅ Scheduled. Tap /menu → 📅 Reminders to view.`);
}