import { cache } from "react";
import { prisma } from "./prisma";

// ── Defaults ──────────────────────────────────────────────────────────────────

export const SETTINGS_DEFAULTS = {
  // Basic
  schoolName: "Second Brain",
  schoolDescription: "Образовательная платформа Second Brain",
  schoolKeywords: "",
  maintenanceMode: "false",
  registrationEnabled: "true",

  // Notifications
  notificationEmails: "", // newline-separated list
  notifyOnHomework: "true",
  notifyOnComment: "true",
  notifyOnRegistration: "true",
  notifyStudentOnFeedback: "true",

  // Student profile
  requireEmailVerification: "true",
  lastNameField: "optional", // required | optional | hidden
  phoneField: "hidden",       // required | optional | hidden

  // Legal
  privacyPolicyUrl: "",
  termsUrl: "",
  offerUrl: "",
  showTermsCheckbox: "false",
  orgRequisites: "",

  // Curator permissions
  curatorHomeworkScope: "all", // all | assigned
  curatorCanAnswerQuestions: "true",
  curatorCanSeeStudents: "true",

  // Logo
  logoUrl: "",
  showLogo: "true",

  // Social networks
  socialYoutube: "",
  socialVk: "",
  socialTelegram: "",

  // Code injection
  headCode: "",
  bodyCode: "",
} as const;

export type SettingsKey = keyof typeof SETTINGS_DEFAULTS;
export type Settings = Record<SettingsKey, string>;

// ── Getters ───────────────────────────────────────────────────────────────────

export const getSettings = cache(async (): Promise<Settings> => {
  try {
    const rows = await prisma.settings.findMany();
    const stored: Record<string, string> = {};
    for (const row of rows) stored[row.key] = row.value;
    return Object.fromEntries(
      Object.entries(SETTINGS_DEFAULTS).map(([k, v]) => [k, stored[k] ?? v])
    ) as Settings;
  } catch {
    // DB unavailable at build time — return defaults
    return { ...SETTINGS_DEFAULTS } as Settings;
  }
});

export async function getSetting(key: SettingsKey): Promise<string> {
  try {
    const row = await prisma.settings.findUnique({ where: { key } });
    return row?.value ?? SETTINGS_DEFAULTS[key];
  } catch {
    return SETTINGS_DEFAULTS[key];
  }
}

// ── Convenience helpers ───────────────────────────────────────────────────────

/** Parse a boolean setting ("true" / "false") */
export function asBool(value: string): boolean {
  return value === "true";
}

/** Parse notification emails (newline-separated string → array) */
export function parseNotificationEmails(value: string): string[] {
  return value
    .split("\n")
    .map((e) => e.trim())
    .filter(Boolean);
}