"use server";

import { ID } from "node-appwrite";
import { Query } from "node-appwrite";

import { createAdminClient } from "./server";
import { requireTenant } from "./tenant-guard";
import { DATABASE_ID, TABLES, ACTIVITY_TYPE_LABELS, type Activity } from "./schema";
import type { AuthState } from "./auth-types";

export type SendTarget = "me" | "team";

export type SendSummaryState = AuthState & { sent?: number };

export async function sendDailySummaryAction(
  _prev: SendSummaryState,
  formData: FormData,
): Promise<SendSummaryState> {
  let ctx;
  try {
    ctx = await requireTenant();
  } catch {
    return { ok: false, error: "Oturum geçersiz." };
  }

  const target = (formData.get("target") ?? "me") as SendTarget;

  if (target === "team" && !["owner", "admin"].includes(ctx.role)) {
    return { ok: false, error: "Bu işlem için yetkiniz yok." };
  }

  const { tablesDB, teams, users, messaging } = createAdminClient();

  const todayStr = new Date().toISOString().split("T")[0]; // "YYYY-MM-DD"

  const activitiesResult = await tablesDB.listRows({
    databaseId: DATABASE_ID,
    tableId: TABLES.activities,
    queries: [
      Query.equal("tenantId", ctx.tenantId),
      Query.limit(500),
    ],
  });

  const allActivities = JSON.parse(JSON.stringify(activitiesResult.rows)) as Activity[];
  const todayActivities = allActivities.filter(
    (a) => a.dueDate?.startsWith(todayStr),
  );

  const dateLabel = new Date().toLocaleDateString("tr-TR", {
    day: "numeric",
    month: "long",
  });

  if (target === "me") {
    const mine = todayActivities.filter(
      (a) => (a.assigneeId ?? a.createdBy) === ctx.user.id,
    );
    if (mine.length === 0) {
      return { ok: false, error: "Bugün için planlanmış aktiviteniz bulunmuyor." };
    }
    await messaging.createEmail(
      ID.unique(),
      `Bugünün Aktiviteleri — ${dateLabel}`,
      buildEmailHtml(mine, ctx.user.name),
      [],
      [ctx.user.id],
      [],
    );
    return { ok: true, sent: 1 };
  }

  // send_to_team: her üyeye kendi aktiviteleri
  const membershipsResult = await teams.listMemberships(ctx.tenantId);
  let sentCount = 0;

  for (const m of membershipsResult.memberships) {
    if (!m.userId || !m.confirm) continue;

    const memberActivities = todayActivities.filter(
      (a) => (a.assigneeId ?? a.createdBy) === m.userId,
    );
    if (memberActivities.length === 0) continue;

    const member = await users.get(m.userId).catch(() => null);
    if (!member) continue;

    await messaging.createEmail(
      ID.unique(),
      `Bugünün Aktiviteleri — ${dateLabel}`,
      buildEmailHtml(memberActivities, member.name),
      [],
      [m.userId],
      [],
    );
    sentCount++;
  }

  if (sentCount === 0) {
    return {
      ok: false,
      error: "Ekip üyelerinin bugün planlanmış aktivitesi bulunmuyor.",
    };
  }

  return { ok: true, sent: sentCount };
}

function buildEmailHtml(activities: Activity[], name: string): string {
  const today = new Date().toLocaleDateString("tr-TR", {
    weekday: "long",
    year: "numeric",
    month: "long",
    day: "numeric",
  });

  const rows = activities
    .map((a) => {
      const done = a.completedAt
        ? `<span style="color:#16a34a;font-weight:600;">✓ Tamamlandı</span>`
        : `<span style="color:#94a3b8;">○ Bekliyor</span>`;
      const type = ACTIVITY_TYPE_LABELS[a.type] ?? a.type;
      const desc = a.description
        ? `<div style="color:#64748b;font-size:13px;margin-top:2px;">${a.description}</div>`
        : "";
      return `
        <tr style="border-bottom:1px solid #f1f5f9;">
          <td style="padding:12px 16px;">
            <div style="font-weight:500;color:#1e293b;">${a.title}</div>
            ${desc}
          </td>
          <td style="padding:12px 16px;white-space:nowrap;">
            <span style="background:#f1f5f9;color:#475569;font-size:12px;padding:2px 8px;border-radius:9999px;">${type}</span>
          </td>
          <td style="padding:12px 16px;white-space:nowrap;font-size:13px;">${done}</td>
        </tr>`;
    })
    .join("");

  return `<!DOCTYPE html>
<html><body style="margin:0;padding:0;background:#f8fafc;font-family:sans-serif;">
<div style="max-width:600px;margin:32px auto;background:#fff;border-radius:12px;overflow:hidden;box-shadow:0 1px 3px rgba(0,0,0,.1);">
  <div style="background:linear-gradient(135deg,#1e3a5f,#2563eb);padding:32px 32px 24px;">
    <p style="color:#93c5fd;font-size:13px;margin:0 0 6px;">Emlak CRM · Günlük Özet</p>
    <h1 style="color:#fff;font-size:22px;margin:0;">Merhaba, ${name}</h1>
    <p style="color:#bfdbfe;font-size:14px;margin:8px 0 0;">${today}</p>
  </div>
  <div style="padding:24px 32px 8px;">
    <p style="color:#475569;font-size:14px;margin:0 0 16px;">
      Bugün için <strong>${activities.length} aktivite</strong> planlanmış:
    </p>
    <table style="width:100%;border-collapse:collapse;border:1px solid #e2e8f0;border-radius:8px;overflow:hidden;">
      <thead>
        <tr style="background:#f8fafc;">
          <th style="padding:10px 16px;text-align:left;color:#64748b;font-size:12px;font-weight:600;text-transform:uppercase;letter-spacing:.05em;">Aktivite</th>
          <th style="padding:10px 16px;text-align:left;color:#64748b;font-size:12px;font-weight:600;text-transform:uppercase;letter-spacing:.05em;">Tür</th>
          <th style="padding:10px 16px;text-align:left;color:#64748b;font-size:12px;font-weight:600;text-transform:uppercase;letter-spacing:.05em;">Durum</th>
        </tr>
      </thead>
      <tbody>${rows}</tbody>
    </table>
  </div>
  <div style="padding:24px 32px;">
    <p style="color:#94a3b8;font-size:12px;margin:0;">
      Bu e-posta Emlak CRM tarafından otomatik olarak gönderilmiştir.
    </p>
  </div>
</div>
</body></html>`;
}