import { resolveMediaUrl } from "@/lib/media-url";
import type { ApiComment, ApiPost, ApiUser } from "@/types/api";

function asUser(value: ApiUser | string | undefined | null) {
  if (!value || typeof value === "string") {
    return null;
  }

  return value;
}

export function getPostAuthor(post: ApiPost) {
  return asUser(post.author ?? post.authorId);
}

export function getCommentAuthor(comment: ApiComment) {
  return asUser(comment.author ?? comment.authorId);
}

export function getUserLabel(user: ApiUser | null) {
  if (!user) {
    return "-";
  }

  return user.name ?? user.stageName ?? user.username ?? user.email ?? "-";
}

export function getPostPreviewMedia(post: ApiPost) {
  const imageCount = post.imageUrls?.length ?? 0;
  const imageUrl = resolveMediaUrl(post.imageUrls?.[0]);
  const thumbnailUrl = resolveMediaUrl(post.thumbnailUrl);
  const videoUrl = resolveMediaUrl(post.videoUrl);
  const audioUrl = resolveMediaUrl(post.audioUrl);

  if (imageCount > 0 && imageUrl) {
    return {
      kind: "image" as const,
      url: imageUrl,
      sourceUrl: "",
      count: imageCount,
    };
  }

  if (thumbnailUrl) {
    return {
      kind: post.postType === "audio" ? ("audio" as const) : ("video" as const),
      url: thumbnailUrl,
      sourceUrl: post.postType === "video" ? videoUrl : audioUrl,
      count: 1,
    };
  }

  if (post.postType === "video" && videoUrl) {
    return {
      kind: "video" as const,
      url: "",
      sourceUrl: videoUrl,
      count: 1,
    };
  }

  return {
    kind:
      post.postType === "audio"
        ? ("audio" as const)
        : post.postType === "video"
          ? ("video" as const)
          : ("text" as const),
    url: "",
    sourceUrl: post.postType === "video" ? videoUrl : post.postType === "audio" ? audioUrl : "",
    count: 0,
  };
}