import "server-only";
import { sql } from "drizzle-orm";
import { db } from "./db";

export async function getDashboardStats(operatorId: string) {
  const accounts = await db.query.whatsappAccounts.findMany({
    where: (a, { eq }) => eq(a.operatorId, operatorId),
  });
  // All reminder rows so the dashboard can show active/total in one query.
  // Status enum today is active / ended (paused will join in a later phase).
  const allReminders = await db.query.reminders.findMany();
  // LEFT JOIN so runs whose reminder has been deleted still appear. The
  // ownership filter widens to: either the reminder still exists and the
  // operator owns its account, OR the reminder is gone but the run row
  // had a name snapshotted (history survives a delete by design).
  const recentRuns = await db.execute(sql`
    SELECT
      rr.id,
      rr.status,
      rr.fired_at,
      rr.reminder_id,
      COALESCE(r.name, rr.reminder_name, '(deleted reminder)') AS name,
      r.id IS NULL AS is_deleted
    FROM reminder_runs rr
    LEFT JOIN reminders r ON r.id = rr.reminder_id
    LEFT JOIN whatsapp_accounts wa ON wa.id = r.account_id
    WHERE wa.operator_id = ${operatorId} OR r.id IS NULL
    ORDER BY rr.fired_at DESC
    LIMIT 3
  `);
  return {
    connectedAccounts: accounts.filter((a) => a.status === "connected").length,
    unpairedAccounts: accounts.filter((a) => a.status === "unpaired").length,
    totalAccounts: accounts.length,
    activeReminders: allReminders.filter((r) => r.status === "active").length,
    pausedReminders: allReminders.filter((r) => r.status === "paused").length,
    endedReminders: allReminders.filter((r) => r.status === "ended").length,
    totalReminders: allReminders.length,
    recentRuns: recentRuns.rows as Array<{
      id: string;
      status: string;
      fired_at: Date;
      reminder_id: string | null;
      name: string;
      is_deleted: boolean;
    }>,
  };
}

export async function listAccounts(operatorId: string) {
  // Show every account the operator owns, regardless of status. The
  // status badge tells the user what state each row is in (Pending /
  // Unpaired / Connected / Disconnected / etc), and the detail page
  // exposes Pair / Re-pair / Delete actions accordingly. Hiding rows
  // by status produced phantom "I created an account but it's gone"
  // bug reports.
  return db.query.whatsappAccounts.findMany({
    where: (a, { eq }) => eq(a.operatorId, operatorId),
    orderBy: (a, { asc }) => [asc(a.label)],
  });
}

export async function getAccount(operatorId: string, accountId: string) {
  return db.query.whatsappAccounts.findFirst({
    where: (a, { eq, and }) => and(eq(a.id, accountId), eq(a.operatorId, operatorId)),
  });
}

export async function listGroupsForAccount(operatorId: string, accountId: string, q?: string) {
  const account = await getAccount(operatorId, accountId);
  if (!account) return null;
  const trimmed = (q ?? "").trim();
  const rows = trimmed
    ? await db.execute(sql`
        SELECT id, account_id, wa_group_jid, name, participant_count, is_archived, last_synced_at
        FROM whatsapp_groups
        WHERE account_id = ${accountId} AND name % ${trimmed}
        ORDER BY similarity(name, ${trimmed}) DESC
        LIMIT 50
      `)
    : await db.execute(sql`
        SELECT id, account_id, wa_group_jid, name, participant_count, is_archived, last_synced_at
        FROM whatsapp_groups
        WHERE account_id = ${accountId}
        ORDER BY name ASC
        LIMIT 200
      `);
  const groups = (rows.rows as Array<Record<string, unknown>>).map((r) => ({
    id: r.id as string,
    accountId: r.account_id as string,
    waGroupJid: r.wa_group_jid as string,
    name: r.name as string,
    participantCount: Number(r.participant_count),
    isArchived: r.is_archived as boolean,
    lastSyncedAt: r.last_synced_at as Date,
  }));
  return { account, groups };
}

export async function getGroup(operatorId: string, groupId: string) {
  const group = await db.query.whatsappGroups.findFirst({
    where: (g, { eq }) => eq(g.id, groupId),
  });
  if (!group) return null;
  const account = await getAccount(operatorId, group.accountId);
  if (!account) return null;
  return { group, account };
}

export async function listReminders(operatorId: string) {
  // Fetch each reminder along with the snippet text from its first
  // message and the comma-separated names+ids of its target groups.
  // Both are needed by the /reminders search + filter UI.
  const rows = await db.execute(sql`
    SELECT
      r.id, r.name, r.schedule_kind, r.scheduled_at, r.rrule, r.timezone, r.status,
      r.created_at, r.account_id,
      wa.label as account_label,
      (SELECT count(*) FROM reminder_targets rt WHERE rt.reminder_id = r.id) as group_count,
      (
        SELECT COALESCE(string_agg(wg.id::text, ',' ORDER BY rt.position), '')
        FROM reminder_targets rt
        JOIN whatsapp_groups wg ON wg.id = rt.group_id
        WHERE rt.reminder_id = r.id
      ) as group_ids,
      (
        SELECT COALESCE(string_agg(wg.name, ' · ' ORDER BY rt.position), '')
        FROM reminder_targets rt
        JOIN whatsapp_groups wg ON wg.id = rt.group_id
        WHERE rt.reminder_id = r.id
      ) as group_names,
      (
        SELECT rm.text_content
        FROM reminder_messages rm
        WHERE rm.reminder_id = r.id
        ORDER BY rm.position ASC
        LIMIT 1
      ) as first_text
    FROM reminders r
    JOIN whatsapp_accounts wa ON wa.id = r.account_id
    WHERE wa.operator_id = ${operatorId}
    ORDER BY r.scheduled_at DESC NULLS LAST, r.created_at DESC
    LIMIT 200
  `);
  // pg returns timestamp columns from raw `db.execute(sql)` as strings,
  // not Date instances — coerce so callers (sort comparators, date
  // formatters) can call .getTime() / .toLocaleDateString() safely.
  const toDate = (v: unknown): Date | null => {
    if (v == null) return null;
    if (v instanceof Date) return v;
    if (typeof v === "string" || typeof v === "number") return new Date(v);
    return null;
  };
  return (rows.rows as Array<Record<string, unknown>>).map((r) => ({
    id: r.id as string,
    name: r.name as string,
    scheduleKind: r.schedule_kind as string,
    scheduledAt: toDate(r.scheduled_at),
    rrule: (r.rrule as string | null) ?? null,
    timezone: r.timezone as string,
    status: r.status as string,
    createdAt: toDate(r.created_at) ?? new Date(0),
    accountId: r.account_id as string,
    accountLabel: r.account_label as string,
    groupCount: Number(r.group_count),
    groupIds: ((r.group_ids as string | null) ?? "").split(",").filter(Boolean),
    groupNames: (r.group_names as string | null) ?? "",
    firstText: (r.first_text as string | null) ?? "",
  }));
}

export interface ActivityRunRow {
  id: string;
  status: string;
  firedAt: Date;
  reminderId: string | null;
  reminderName: string;
  isDeleted: boolean;
  archivedAt: Date | null;
}

export async function listActivityRuns(
  operatorId: string,
  opts: { archived?: boolean } = {},
): Promise<ActivityRunRow[]> {
  // Mirrors the dashboard query but returns the full window (last 200) and
  // exposes a stable shape. LEFT JOIN keeps orphan runs (whose reminder
  // has been deleted but history was preserved) in the list.
  // The `archived` flag flips the visibility filter:
  //   false (default) — only non-archived rows
  //   true            — only archived rows (for the Archived tab)
  const archivedClause = opts.archived
    ? sql`rr.archived_at IS NOT NULL`
    : sql`rr.archived_at IS NULL`;
  const rows = await db.execute(sql`
    SELECT
      rr.id,
      rr.status,
      rr.fired_at,
      rr.reminder_id,
      rr.archived_at,
      COALESCE(r.name, rr.reminder_name, '(deleted reminder)') AS name,
      r.id IS NULL AS is_deleted
    FROM reminder_runs rr
    LEFT JOIN reminders r ON r.id = rr.reminder_id
    LEFT JOIN whatsapp_accounts wa ON wa.id = r.account_id
    WHERE (wa.operator_id = ${operatorId} OR r.id IS NULL)
      AND ${archivedClause}
    ORDER BY rr.fired_at DESC
    LIMIT 200
  `);
  return (rows.rows as Array<Record<string, unknown>>).map((r) => ({
    id: r.id as string,
    status: r.status as string,
    firedAt: r.fired_at as Date,
    reminderId: (r.reminder_id as string | null) ?? null,
    reminderName: r.name as string,
    isDeleted: Boolean(r.is_deleted),
    archivedAt: (r.archived_at as Date | null) ?? null,
  }));
}

export async function getReminderWithRuns(operatorId: string, reminderId: string) {
  const reminder = await db.query.reminders.findFirst({
    where: (r, { eq }) => eq(r.id, reminderId),
  });
  if (!reminder) return null;
  // Verify operator owns the reminder via the account
  const account = await db.query.whatsappAccounts.findFirst({
    where: (a, { eq, and }) => and(eq(a.id, reminder.accountId), eq(a.operatorId, operatorId)),
  });
  if (!account) return null;
  const targets = await db.execute(sql`
    SELECT rt.group_id, wg.name as group_name
    FROM reminder_targets rt
    JOIN whatsapp_groups wg ON wg.id = rt.group_id
    WHERE rt.reminder_id = ${reminderId}
    ORDER BY rt.position
  `);
  const messages = await db.query.reminderMessages.findMany({
    where: (m, { eq }) => eq(m.reminderId, reminderId),
    orderBy: (m, { asc }) => [asc(m.position)],
  });
  const runs = await db.execute(sql`
    SELECT id, fired_at, status, error_summary
    FROM reminder_runs
    WHERE reminder_id = ${reminderId}
    ORDER BY fired_at DESC
    LIMIT 20
  `);
  return {
    reminder,
    account,
    targets: (targets.rows as Array<Record<string, unknown>>).map((r) => ({
      groupId: r.group_id as string,
      groupName: r.group_name as string,
    })),
    messages,
    runs: (runs.rows as Array<Record<string, unknown>>).map((r) => ({
      id: r.id as string,
      firedAt: r.fired_at as Date,
      status: r.status as string,
      errorSummary: r.error_summary as string | null,
    })),
  };
}