import type { TenantPackageSummary } from '../../api';

type Translate = any;

type LimitUsageOverrides = {
  remainingEvents?: number | null;
  usedEvents?: number | null;
};

const FEATURE_LABELS: Record<string, { key: string; fallback: string }> = {
  priority_support: {
    key: 'mobileDashboard.packageSummary.feature.priority_support',
    fallback: 'Priority support',
  },
  reseller_dashboard: {
    key: 'mobileDashboard.packageSummary.feature.reseller_dashboard',
    fallback: 'Reseller dashboard',
  },
  custom_domain: {
    key: 'mobileDashboard.packageSummary.feature.custom_domain',
    fallback: 'Custom domain',
  },
  custom_branding: {
    key: 'mobileDashboard.packageSummary.feature.custom_branding',
    fallback: 'Custom branding',
  },
  custom_tasks: {
    key: 'mobileDashboard.packageSummary.feature.custom_tasks',
    fallback: 'Custom tasks',
  },
  unlimited_sharing: {
    key: 'mobileDashboard.packageSummary.feature.unlimited_sharing',
    fallback: 'Unlimited sharing',
  },
  analytics: {
    key: 'mobileDashboard.packageSummary.feature.analytics',
    fallback: 'Analytics',
  },
  advanced_reporting: {
    key: 'mobileDashboard.packageSummary.feature.advanced_reporting',
    fallback: 'Advanced reporting',
  },
  live_slideshow: {
    key: 'mobileDashboard.packageSummary.feature.live_slideshow',
    fallback: 'Live slideshow',
  },
  basic_uploads: {
    key: 'mobileDashboard.packageSummary.feature.basic_uploads',
    fallback: 'Guest uploads',
  },
  team_management: {
    key: 'mobileDashboard.packageSummary.feature.team_management',
    fallback: 'Team management',
  },
  moderation_tools: {
    key: 'mobileDashboard.packageSummary.feature.moderation_tools',
    fallback: 'Moderation tools',
  },
  prints: {
    key: 'mobileDashboard.packageSummary.feature.prints',
    fallback: 'Print uploads',
  },
  photo_likes_enabled: {
    key: 'mobileDashboard.packageSummary.feature.photo_likes_enabled',
    fallback: 'Photo likes',
  },
  event_checklist: {
    key: 'mobileDashboard.packageSummary.feature.event_checklist',
    fallback: 'Event checklist',
  },
  advanced_analytics: {
    key: 'mobileDashboard.packageSummary.feature.advanced_analytics',
    fallback: 'Advanced analytics',
  },
  branding_allowed: {
    key: 'mobileDashboard.packageSummary.feature.branding_allowed',
    fallback: 'Branding',
  },
  watermark_allowed: {
    key: 'mobileDashboard.packageSummary.feature.watermark_allowed',
    fallback: 'Watermarks',
  },
};

const LIMIT_LABELS: Array<{ key: string; labelKey: string; fallback: string }> = [
  {
    key: 'max_photos',
    labelKey: 'packageLimits.max_photos',
    fallback: 'Photos',
  },
  {
    key: 'max_guests',
    labelKey: 'packageLimits.max_guests',
    fallback: 'Guests',
  },
  {
    key: 'max_tasks',
    labelKey: 'packageLimits.max_tasks',
    fallback: 'Tasks',
  },
  {
    key: 'gallery_days',
    labelKey: 'packageLimits.gallery_days',
    fallback: 'Gallery days',
  },
  {
    key: 'max_events_per_year',
    labelKey: 'packageLimits.max_events_per_year',
    fallback: 'Events per year',
  },
];

export type PackageLimitEntry = {
  key: string;
  label: string;
  value: string;
};

const toNumber = (value: unknown): number | null => {
  if (typeof value === 'number' && Number.isFinite(value)) {
    return value;
  }

  if (typeof value === 'string' && value.trim() !== '') {
    const parsed = Number(value);
    if (Number.isFinite(parsed)) {
      return parsed;
    }
  }

  return null;
};

const formatLimitWithRemaining = (limit: number | null, remaining: number | null, t: Translate): string => {
  if (limit === null || limit === undefined) {
    return t('mobileDashboard.packageSummary.unlimited', 'Unlimited');
  }

  if (remaining !== null && remaining >= 0) {
    const normalizedRemaining = Number.isFinite(remaining) ? Math.max(0, Math.round(remaining)) : remaining;
    if (normalizedRemaining > limit) {
      return t('mobileBilling.usage.remaining', {
        count: normalizedRemaining,
        defaultValue: 'Remaining {{count}}',
      });
    }
    return t('mobileBilling.usage.remainingOf', {
      remaining: normalizedRemaining,
      limit,
      defaultValue: '{{remaining}} of {{limit}} remaining',
    });
  }

  return String(limit);
};

export function getPackageFeatureLabel(feature: string, t: Translate): string {
  const entry = FEATURE_LABELS[feature];
  if (entry) {
    return t(entry.key, entry.fallback);
  }

  return t(`mobileDashboard.packageSummary.feature.${feature}`, feature);
}

export function formatPackageLimit(value: number | null | undefined, t: Translate): string {
  if (value === null || value === undefined) {
    return t('mobileDashboard.packageSummary.unlimited', 'Unlimited');
  }

  return String(value);
}

export function getPackageLimitEntries(
  limits: Record<string, unknown> | null,
  t: Translate,
  usageOverrides: LimitUsageOverrides = {}
): PackageLimitEntry[] {
  if (!limits) {
    return [];
  }

  return LIMIT_LABELS.map(({ key, labelKey, fallback }) => ({
    key,
    label: t(labelKey, fallback),
    value: formatLimitWithRemaining(
      toNumber((limits as Record<string, number | null>)[key]),
      resolveRemainingForKey(limits, key, usageOverrides),
      t
    ),
  }));
}

const resolveRemainingForKey = (
  limits: Record<string, unknown>,
  key: string,
  usageOverrides: LimitUsageOverrides
): number | null => {
  if (key === 'max_events_per_year') {
    return toNumber(usageOverrides.remainingEvents ?? limits.remaining_events);
  }

  const map: Record<string, string> = {
    max_photos: 'remaining_photos',
    max_guests: 'remaining_guests',
    gallery_days: 'remaining_gallery_days',
  };

  const remainingKey = map[key];
  if (!remainingKey) {
    return null;
  }

  return toNumber(limits[remainingKey]);
};

export function collectPackageFeatures(pkg: TenantPackageSummary): string[] {
  const features = new Set<string>();
  const direct = Array.isArray(pkg.features) ? pkg.features : [];
  const limitFeatures = Array.isArray((pkg.package_limits as any)?.features) ? (pkg.package_limits as any).features : [];

  direct.forEach((feature) => {
    if (typeof feature === 'string' && feature.trim()) {
      features.add(feature);
    }
  });

  limitFeatures.forEach((feature: unknown) => {
    if (typeof feature === 'string' && feature.trim()) {
      features.add(feature);
    }
  });

  if (pkg.branding_allowed) {
    features.add('branding_allowed');
  }

  if (pkg.watermark_allowed) {
    features.add('watermark_allowed');
  }

  return Array.from(features);
}

export function formatEventUsage(used: number | null, limit: number | null, t: Translate): string | null {
  if (limit === null || used === null) {
    return null;
  }

  return t('mobileBilling.eventsCreated', { used, limit, defaultValue: '{{used}} of {{limit}} events created' });
}