import type { ImageSourcePropType } from 'react-native';

export type IdentityStat = {
  key: string;
  label: string;
  value: number;
};

const STAT_BLUEPRINT: IdentityStat[] = [
  { key: 'likes', label: 'likes', value: 0 },
  { key: 'posts', label: 'posts', value: 0 },
  { key: 'views', label: 'views', value: 0 },
];

export function createStats(user: unknown): IdentityStat[] {
  const source = (user as Record<string, unknown>) ?? {};
  return STAT_BLUEPRINT.map(stat => ({
    ...stat,
    value: deriveNumericValue(source[stat.key]),
  }));
}

export function deriveDisplayName(user: unknown): string | null {
  if (!user || typeof user !== 'object') {
    return null;
  }
  const data = user as Record<string, unknown>;
  return ensureString(data.username) ?? ensureString(data.name) ?? null;
}

export function deriveAvatarSource(user: unknown): ImageSourcePropType | undefined {
  if (!user || typeof user !== 'object') {
    return undefined;
  }
  const image = ensureString((user as Record<string, unknown>).image);
  if (!image) {
    return undefined;
  }
  return { uri: image };
}

export function deriveNumericValue(value: unknown): number {
  if (typeof value === 'number' && Number.isFinite(value)) {
    return value;
  }
  if (typeof value === 'string') {
    const parsed = Number(value);
    if (Number.isFinite(parsed)) {
      return parsed;
    }
  }
  return 0;
}

export function deriveInitials(name: string): string {
  const tokens = name
    .replace(/[_-]+/g, ' ')
    .split(/\s+/)
    .filter(Boolean);
  if (tokens.length === 0) {
    return 'AI';
  }
  const initials = tokens.slice(0, 2).map(part => part[0]?.toUpperCase() ?? '');
  return initials.join('') || tokens[0][0]?.toUpperCase() || 'AI';
}

function ensureString(value: unknown): string | null {
  if (typeof value !== 'string') {
    return null;
  }
  const trimmed = value.trim();
  return trimmed.length > 0 ? trimmed : null;
}