import { Injectable, NotFoundException } from '@nestjs/common';
import { iranDaysUntil } from '../common/iran-time.util';
import { PrismaService } from '../prisma/prisma.service';
import { applyKhanegiNavSample } from './khanegi-nav-sample';
import { rewriteLegacyUploadUrl } from '../uploads/uploads.util';
import { PLUGIN_STORE_SETTING_KEY } from '../program-settings/runtime-setting-keys';
import {
  findTenantForHost as matchTenantForHost,
  normalizeTenantHost,
} from '../auth/tenant-host.util';

type UiSetting = { key: string; value: string };

type SubscriptionAlertStatus = 'expiring' | 'expired';

type SubscriptionAlertItem = {
  id: string;
  name: string;
  expires_at: string;
  days_left: number;
  status: SubscriptionAlertStatus;
};

type SubscriptionAlerts = {
  servers: SubscriptionAlertItem[];
  plugins: SubscriptionAlertItem[];
  supports: SubscriptionAlertItem[];
};

@Injectable()
export class GetUserService {
  constructor(private readonly prisma: PrismaService) {}

  async resolveByHost(hostHeader?: string, domainQuery?: string) {
    const host = normalizeTenantHost(domainQuery || hostHeader || '');
    if (!host) {
      throw new NotFoundException('domain required');
    }

    const tenants = await this.prisma.tenant.findMany({
      where: { isActive: true },
    });

    const tenant = this.findTenantForHost(tenants, host);
    if (!tenant) {
      throw new NotFoundException('tenant not found for domain');
    }

    const subscription_alerts = await this.buildSubscriptionAlerts(tenant.id);

    const ui = (tenant.appUiConfig as Record<string, any> | null) || null;
    const isHamkarUi = tenant.product === 'hamkar' && ui?.kind === 'hamkar';
    const hamkarBrand = isHamkarUi ? ui?.brand : null;
    const khanegiColors = ui?.app?.theme?.colors;
    const uiSettings =
      isHamkarUi && ui?.settingsManaged === true
        ? this.buildHamkarUiSettings(ui)
        : [];

    // Preserve named CSS modes from live registry (e.g. limangold / Montpar).
    // Fallback to notes marker if JSON field missing on older rows.
    const noteMode = tenant.notes?.match(/registryMode:([^\s|]+)/)?.[1] || null
    const registryMode =
      (typeof ui?.registryMode === 'string' && ui.registryMode.trim()) ||
      noteMode ||
      null
    const themeMode =
      registryMode && registryMode !== 'dynamicMode'
        ? registryMode
        : 'dynamicMode'

    const isKhanegi = tenant.product === 'khanegi';
    const uiVariant =
      isKhanegi && tenant.uiVariant === 'newTheme' ? 'newTheme' : 'modular';

    const color =
      hamkarBrand?.primaryColor ||
      (uiVariant === 'newTheme' ? khanegiColors?.primary : null) ||
      tenant.primaryColor ||
      null
    const secondary =
      hamkarBrand?.secondaryColor ||
      (uiVariant === 'newTheme' ? khanegiColors?.secondary : null) ||
      tenant.secondaryColor ||
      null
    const background =
      hamkarBrand?.backgroundColor ||
      (uiVariant === 'newTheme' ? khanegiColors?.background : null) ||
      tenant.backgroundColor ||
      null

    const branding = {
      id: tenant.id,
      name: tenant.nameEn || tenant.slug,
      name_fa: tenant.nameFa,
      name_en: tenant.nameEn,
      avatar: rewriteLegacyUploadUrl(tenant.avatarUrl),
      color,
      secondary_color: secondary,
      background_color: background,
      node_server: tenant.nodeServer,
      node_ws: tenant.nodeWs,
      app_url: tenant.appUrl,
      admin_url: tenant.adminUrl,
      product: tenant.product,
      theme: themeMode,
      mode: themeMode,
      /** Stealth cold-boot gate — false looks like product server unreachable */
      server_reachable: !Boolean(tenant.serverAccessBlocked),
      /** Khanegi front-end family for consumers */
      ui_variant: isKhanegi ? uiVariant : undefined,
      app_ui_config:
        isKhanegi && uiVariant === 'newTheme'
          ? this.stripKhanegiSaMeta(this.normalizeKhanegiUiConfig(ui))
          : undefined,
      /** Laravel-compatible overlay; Hamkar merges only when present */
      ui_settings: uiSettings.length ? uiSettings : undefined,
      /** Admin expiry modals — near/expired server, plugin, support */
      subscription_alerts,
      plugin_store_enabled: isKhanegi
        ? await this.isPluginStoreEnabled(tenant.id)
        : false,
    };

    return {
      ...branding,
      user: { ...branding },
    };
  }

  private async isPluginStoreEnabled(tenantId: string): Promise<boolean> {
    try {
      const row = await this.prisma.setting.findUnique({
        where: { tenantId_key: { tenantId, key: PLUGIN_STORE_SETTING_KEY } },
        select: { value: true },
      });
      return row?.value === 'true';
    } catch {
      return false;
    }
  }

  private async buildSubscriptionAlerts(tenantId: string): Promise<SubscriptionAlerts> {
    const [servers, plugins, supports] = await Promise.all([
      this.prisma.serverAccount.findMany({
        where: {
          tenantId,
          isDedicated: false,
          expiresAt: { not: null },
        },
        select: {
          id: true,
          serverName: true,
          expiresAt: true,
          alertDaysBefore: true,
        },
      }),
      this.prisma.pluginSubscription.findMany({
        where: {
          tenantId,
          isActive: true,
          expiresAt: { not: null },
        },
        select: {
          id: true,
          name: true,
          expiresAt: true,
          alertDaysBefore: true,
        },
      }),
      this.prisma.supportSubscription.findMany({
        where: {
          tenantId,
          isActive: true,
          expiresAt: { not: null },
        },
        select: {
          id: true,
          name: true,
          expiresAt: true,
          alertDaysBefore: true,
        },
      }),
    ]);

    return {
      servers: servers
        .map((row) =>
          this.toAlertItem({
            id: row.id,
            name: (row.serverName || '').trim() || 'سرور',
            expiresAt: row.expiresAt!,
            alertDaysBefore: row.alertDaysBefore,
          }),
        )
        .filter((item): item is SubscriptionAlertItem => item != null),
      plugins: plugins
        .map((row) =>
          this.toAlertItem({
            id: row.id,
            name: (row.name || '').trim() || 'افزونه',
            expiresAt: row.expiresAt!,
            alertDaysBefore: row.alertDaysBefore,
          }),
        )
        .filter((item): item is SubscriptionAlertItem => item != null),
      supports: supports
        .map((row) =>
          this.toAlertItem({
            id: row.id,
            name: (row.name || '').trim() || 'پشتیبانی',
            expiresAt: row.expiresAt!,
            alertDaysBefore: row.alertDaysBefore,
          }),
        )
        .filter((item): item is SubscriptionAlertItem => item != null),
    };
  }

  private toAlertItem(input: {
    id: string;
    name: string;
    expiresAt: Date;
    alertDaysBefore: number;
  }): SubscriptionAlertItem | null {
    const daysLeft = iranDaysUntil(input.expiresAt);
    const threshold = Math.max(0, Number(input.alertDaysBefore) || 0);

    let status: SubscriptionAlertStatus | null = null;
    if (daysLeft < 0) {
      status = 'expired';
    } else if (daysLeft <= threshold) {
      status = 'expiring';
    }

    if (!status) return null;

    return {
      id: input.id,
      name: input.name,
      expires_at: input.expiresAt.toISOString(),
      days_left: daysLeft,
      status,
    };
  }

  /**
   * Web App Manifest برای PWA / ساخت APK — برندینگ همان get_user
   * GET /manifest.json?domain=
   */
  async resolveManifestByHost(hostHeader?: string, domainQuery?: string) {
    const branding = await this.resolveByHost(hostHeader, domainQuery);
    const name =
      String(branding.name_fa || branding.name_en || branding.name || '').trim() ||
      'App';
    const themeColor = String(branding.color || '').trim() || '#2563eb';
    const backgroundColor =
      String(branding.background_color || '').trim() || '#ffffff';
    const avatar = this.toAbsoluteIconUrl(branding.avatar);

    if (!avatar) {
      throw new NotFoundException('tenant avatar required for manifest');
    }

    const iconType = this.guessImageMime(avatar);
    const iconSizes = ['1024x1024', '512x512', '192x192', '180x180'] as const;

    return {
      name,
      short_name: name,
      lang: 'fa',
      dir: 'rtl',
      start_url: '/',
      scope: '/',
      display: 'standalone',
      background_color: backgroundColor,
      theme_color: themeColor,
      description: name,
      icons: iconSizes.map((sizes) => ({
        src: avatar,
        sizes,
        type: iconType,
        purpose: 'any',
      })),
    };
  }

  private toAbsoluteIconUrl(raw: unknown): string {
    const value = rewriteLegacyUploadUrl(raw);
    if (!value) return '';
    if (/^(https?:\/\/|data:)/i.test(value)) return value;
    if (value.startsWith('//')) return `https:${value}`;

    const publicBase = String(process.env.PUBLIC_API_URL || process.env.APP_URL || '')
      .trim()
      .replace(/\/$/, '');
    if (publicBase && value.startsWith('/')) {
      return `${publicBase}${value}`;
    }
    if (publicBase) {
      return `${publicBase}/${value.replace(/^\/+/, '')}`;
    }
    return value.startsWith('/') ? value : `/${value}`;
  }

  private guessImageMime(url: string) {
    const path = url.split('?')[0].toLowerCase();
    if (path.endsWith('.jpg') || path.endsWith('.jpeg')) return 'image/jpeg';
    if (path.endsWith('.webp')) return 'image/webp';
    if (path.endsWith('.svg')) return 'image/svg+xml';
    return 'image/png';
  }

  private stripKhanegiSaMeta(ui: Record<string, any> | null) {
    if (!ui || typeof ui !== 'object') return ui;
    const { defaultSnapshot: _snap, _backfill, ...rest } = ui;
    return rest;
  }

  /**
   * Backfillهای قدیمی sidebar+bottom / route=products / بدون header.variant
   * را با اسکیمای userTheme هم‌تراز می‌کند تا Zod رد نکند و fallback نشود.
   */
  private normalizeKhanegiUiConfig(ui: Record<string, any> | null) {
    if (!ui || typeof ui !== 'object') return ui;
    const next = JSON.parse(JSON.stringify(ui)) as Record<string, any>;
    this.normalizeKhanegiAppNode(next.app);
    this.normalizeKhanegiAppNode(next.defaultSnapshot?.app);
    return next;
  }

  private normalizeKhanegiAppNode(app: any) {
    if (!app || typeof app !== 'object') return;

    if (app.startRoute === 'products') app.startRoute = 'buyProduct';

    const header = app.header;
    if (header && typeof header === 'object' && header.variant !== 'default') {
      header.variant = 'default';
    }

    const navigation = app.navigation;
    if (!navigation || typeof navigation !== 'object') {
      app.navigation = { type: 'both' };
    } else if (navigation.type === 'sidebar+bottom') {
      navigation.type = 'both';
    }

    const nav = app.navigation;
    const mapItems = (items: unknown) => {
      if (!Array.isArray(items)) return items;
      return items.map((item) => {
        if (!item || typeof item !== 'object') return item;
        if (item.route === 'products') return { ...item, route: 'buyProduct' };
        return item;
      });
    };

    nav.sidebar = mapItems(nav.sidebar);
    nav.bottom = mapItems(nav.bottom);
    if (nav.sidebarReferral?.route === 'products') {
      nav.sidebarReferral.route = 'buyProduct';
    }
    applyKhanegiNavSample(nav);
  }

  private buildHamkarUiSettings(ui: Record<string, any>): UiSetting[] {
    const settings = ui?.settings;
    if (!settings || typeof settings !== 'object') return [];

    const out: UiSetting[] = [];
    for (const key of ['pricing_box_theme', 'price_font_size', 'orderUI'] as const) {
      const value = settings[key];
      if (value == null || value === '') continue;
      out.push({ key, value: String(value) });
    }
    return out;
  }

  /**
   * همان منطق HMAC ریموت: دامنهٔ اصلی، aliases، بعد admin/app/node URL.
   */
  private findTenantForHost<T extends { domain: string; domains: unknown }>(
    tenants: T[],
    host: string,
  ): T | undefined {
    return matchTenantForHost(tenants, host);
  }
}