import type { Logger } from "pino";
import PocketBase from "pocketbase";

export type MicroBlogPostImage = {
  id: string;
  collectionId: string;
  image: string;
  alt?: string;
  remoteURL: string;
};

export type MicroBlogPostTag = {
  id: string;
  tag: string;
};

export type MicroBlogPostSource =
  | "blue_sky"
  | "mastodon"
  | "pleroma"
  | "pixelfed";

export type MicroBlogPost = {
  source: MicroBlogPostSource;
  fullPost: any;
  remoteId: string;
  authorId: string;
  id: string;
  expand: {
    images?: MicroBlogPostImage[];
    tags?: {
      id: string;
    }[];
  };
};

export class MicroBlogBackend {
  private pb: PocketBase;
  private clientSetTime?: Date;
  constructor(private logger: Logger) {
    this.pb = new PocketBase("https://personal-pocket-base.fly.dev");
  }

  private async login() {
    const pw = process.env.POCKET_BASE_PW!;
    const userName = process.env.POCKET_BASE_USER!;
    this.logger.info({ userName }, "Logging in to pocketbase");
    await this.pb.collection("users").authWithPassword(userName, pw);
    this.clientSetTime = new Date();
  }

  private async checkLogin() {
    if (!this.clientSetTime) {
      await this.login();
      return;
    }
    const now = new Date();
    const diff = now.getTime() - this.clientSetTime.getTime();
    const day = 86_400_000;

    if (diff > day) {
      await this.login();
      return;
    }
  }

  public async getLatestPostId(
    postSource: MicroBlogPostSource
  ): Promise<string | undefined> {
    await this.checkLogin();
    try {
      const post = await this.pb
        .collection<MicroBlogPost>("micro_blog_posts")
        .getFirstListItem(`source = '${postSource}'`, { sort: "-posted" });
      return post.id;
    } catch (error: any) {
      if (error.status === 404) {
        return undefined;
      }
      throw error;
    }
  }

  async getTag(tag: string): Promise<MicroBlogPostTag | undefined> {
    await this.checkLogin();
    try {
      const remoteTag = await this.pb
        .collection<MicroBlogPostTag>("micro_blog_tags")
        .getFirstListItem(`tag = '${tag}'`);
      return remoteTag;
    } catch (e: any) {
      if (e.status === 404) {
        return undefined;
      }
      throw e;
    }
  }

  async getImageByRemoteURL(
    remoteURL: string
  ): Promise<MicroBlogPostImage | undefined> {
    await this.checkLogin();
    try {
      const remoteImage = await this.pb
        .collection<MicroBlogPostImage>("micro_blog_images")
        .getFirstListItem(`remoteURL = '${remoteURL}'`);
      return remoteImage;
    } catch (e: any) {
      if (e.status === 404) {
        return undefined;
      }
      throw e;
    }
  }

  private async checkForPost(
    remoteId: string
  ): Promise<MicroBlogPost | undefined> {
    await this.checkLogin();
    try {
      return await this.pb
        .collection<MicroBlogPost>("micro_blog_posts")
        .getFirstListItem(`remoteId = '${remoteId}'`);
    } catch (e: any) {
      if (e.status === 404) {
        return undefined;
      }
      throw e;
    }
  }

  public async savePost(
    post: Omit<MicroBlogPost, "id" | "expand">
  ): Promise<MicroBlogPost> {
    const existingPost = await this.checkForPost(post.remoteId);
    if (!existingPost) {
      return await this.pb
        .collection<MicroBlogPost>("micro_blog_posts")
        .create(post);
    }
    this.logger.info({ existingPost }, "Found existing post");
    return existingPost;
  }

  public async setTag(rawTag: string, postId: string) {
    let tag = await this.getTag(rawTag);
    if (!tag) {
      tag = await this.pb
        .collection<MicroBlogPostTag>("micro_blog_tags")
        .create({ tag: rawTag });
    }
    if (!tag) {
      throw new Error("Failed to create tag");
    }
    await this.pb.collection("micro_blog_posts").update(postId, {
      "tags+": tag.id,
    });
  }

  public async saveAndSetImage(
    imageToSave: Omit<MicroBlogPostImage, "id" | "image" | "collectionId">,
    postId: string
  ) {
    let image = await this.getImageByRemoteURL(imageToSave.remoteURL);
    if (!image) {
      const imageResponse = await fetch(imageToSave.remoteURL);
      if (!imageResponse.ok) {
        throw new Error("Failed to download image");
      }
      const imageBlob = await imageResponse.blob();
      const imageFile = new File([imageBlob], "image.jpg", {
        type: imageBlob.type,
      });
      const data = {
        ...imageToSave,
        image: imageFile,
      };
      image = await this.pb
        .collection<MicroBlogPostTag>("micro_blog_images")
        .create(data);
    }
    if (!image) {
      throw new Error("Failed to create image");
    }
    await this.pb.collection("micro_blog_posts").update(postId, {
      "images+": image.id,
    });
  }

  public async getPosts(page: number, limit = 20) {
    await this.checkLogin();
    const resultList = await this.pb
      .collection<MicroBlogPost>("micro_blog_posts")
      .getList(page, limit, {
        sort: "-posted",
        expand: "images,tags",
        filter: `(source = "blue_sky" || source = "pleroma")`,
        //   filter: 'source = "pleroma"',
      });
    return resultList;
  }
}