import { sql } from "drizzle-orm";
import { db } from "../db/client.js";
import { settings } from "../db/schema.js";

export interface GotifySettings {
  enabled: boolean;
  url: string;
  token: string;
  priority: number;
}

export interface NtfySettings {
  enabled: boolean;
  url: string;
  topic: string;
  token: string;
  priority: number;
}

export interface SmtpSettings {
  enabled: boolean;
  host: string;
  port: number;
  secure: boolean;
  username: string;
  password: string;
  from: string;
  to: string;
}

export interface WebhookSettings {
  enabled: boolean;
  url: string;
  secret: string;
}

export interface NotificationEvents {
  dnsAdd: boolean;
  dnsUpdate: boolean;
  dnsDelete: boolean;
  secretCheck: boolean;
  secretCheckTime: string; // "HH:MM"
  timezone: string;
}

export type ProviderColors = Record<string, string>;
export type IntegrationColors = Record<string, string>;

export type DateFormat = "ymd" | "dmy" | "mdy";
export type TimeFormat = "24h" | "12h";

export interface DisplaySettings {
  dateFormat: DateFormat;
  timeFormat: TimeFormat;
}

export interface AppSettings {
  gotify: GotifySettings;
  ntfy: NtfySettings;
  smtp: SmtpSettings;
  webhook: WebhookSettings;
  notifications: NotificationEvents;
  providerColors: ProviderColors;
  integrationColors: IntegrationColors;
  display: DisplaySettings;
}

const DEFAULTS: AppSettings = {
  gotify: { enabled: false, url: "", token: "", priority: 5 },
  ntfy: { enabled: false, url: "https://ntfy.sh", topic: "", token: "", priority: 3 },
  smtp: { enabled: false, host: "", port: 587, secure: false, username: "", password: "", from: "", to: "" },
  webhook: { enabled: false, url: "", secret: "" },
  notifications: {
    dnsAdd: true,
    dnsUpdate: true,
    dnsDelete: true,
    secretCheck: true,
    secretCheckTime: "08:00",
    timezone: "UTC",
  },
  providerColors: {},
  integrationColors: {},
  display: { dateFormat: "ymd", timeFormat: "24h" },
};

const KEYS = Object.keys(DEFAULTS) as (keyof AppSettings)[];

export async function getSettings(): Promise<AppSettings> {
  const rows = await db.select().from(settings);
  const byKey = new Map(rows.map((r) => [r.key, r.value]));

  const result = {} as AppSettings;
  for (const key of KEYS) {
    const raw = byKey.get(key);
    let parsed: Record<string, unknown> = {};
    if (raw) {
      try {
        parsed = JSON.parse(raw);
      } catch {
        parsed = {};
      }
    }
    (result[key] as Record<string, unknown>) = { ...(DEFAULTS[key] as object), ...parsed };
  }
  return result;
}

export type AppSettingsPatch = { [K in keyof AppSettings]?: Partial<AppSettings[K]> };

export async function updateSettings(partial: AppSettingsPatch): Promise<AppSettings> {
  const current = await getSettings();

  for (const key of Object.keys(partial) as (keyof AppSettings)[]) {
    if (!KEYS.includes(key)) continue;
    const merged = { ...(current[key] as object), ...(partial[key] as object) };
    const value = JSON.stringify(merged);
    await db
      .insert(settings)
      .values({ key, value })
      .onConflictDoUpdate({ target: settings.key, set: { value, updatedAt: sql`(current_timestamp)` } });
  }

  return getSettings();
}

/** Small internal key/value slot for scheduler bookkeeping, outside the AppSettings shape. */
export async function getInternalFlag(key: string): Promise<string | null> {
  const [row] = await db.select().from(settings).where(sql`${settings.key} = ${`_internal:${key}`}`).limit(1);
  return row?.value ?? null;
}

export async function setInternalFlag(key: string, value: string): Promise<void> {
  const fullKey = `_internal:${key}`;
  await db
    .insert(settings)
    .values({ key: fullKey, value })
    .onConflictDoUpdate({ target: settings.key, set: { value, updatedAt: sql`(current_timestamp)` } });
}