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* Services for the post image table.
* @packageDocumentation
*/
import { BaseService } from "./util";
import { Image } from "./image";
/**
* Post image architecture.
*/
export interface PostImage {
postID: string;
imageID: string;
}
/**
* Post image count architecture.
*/
interface PostImageCount {
count: number;
}
/**
* Post image with only ID architecture.
*/
interface PostImageID {
imageID: string;
}
/**
* Post image services.
*/
export class PostImageService extends BaseService {
/**
* Get all images associated with a post.
*
* @param postID A post's ID.
* @returns The images associated with the post.
*/
public async getPostImages(postID: string): Promise<Image[]> {
const sql = `
SELECT Image.*
FROM Image
JOIN (
SELECT * FROM PostImage WHERE postID = ?
) AS PostImageRecords ON Image.id = PostImageRecords.imageID
ORDER BY PostImageRecords.id;
`;
const params = [postID];
const rows: Image[] = await this.dbm.execute(sql, params);
return rows;
}
/**
* Associate an image with a post.
*
* @param postID A post's ID.
* @param imageID An image's ID.
*/
public async setPostImage(postID: string, imageID: string): Promise<void> {
const sql = `
INSERT INTO PostImage (
postID, imageID
) VALUES (
?, ?
);
`;
const params = [postID, imageID];
await this.dbm.execute(sql, params);
}
/**
* Create a new image and associate it with a post.
*
* @param postID A post's ID.
* @param imageData The binary data of the new image.
* @returns The new image's ID.
*/
public async createPostImage(
postID: string,
imageData: Buffer
): Promise<string> {
const imageID = await this.dbm.imageService.createImage(imageData);
await this.setPostImage(postID, imageID);
return imageID;
}
/**
* Create new images and associate them with a post.
*
* @param postID A post's ID.
* @param imageData The binary data of the new images.
* @returns The IDs of the new images.
*/
public async createPostImages(
postID: string,
imageData: Buffer[]
): Promise<string[]> {
let imageIDs: string[] = [];
for (const data of imageData) {
const imageID = await this.createPostImage(postID, data);
imageIDs.push(imageID);
}
return imageIDs;
}
/**
* Get the number of images associated with a post.
*
* @param postID A post's ID.
* @returns The number of images associated with the post.
*/
public async numImages(postID: string): Promise<number> {
const sql = `SELECT COUNT(*) AS count FROM PostImage WHERE postID = ?;`;
const params = [postID];
const rows: PostImageCount[] = await this.dbm.execute(sql, params);
return rows[0].count;
}
/**
* Delete all images associated with a post.
*
* @param postID A post's ID.
*/
public async deletePostImages(postID: string): Promise<void> {
let sql = `SELECT imageID FROM PostImage WHERE postID = ?`;
let params: any = [postID];
const rows: PostImageID[] = await this.dbm.execute(sql, params);
const imageIDs = rows.map((postImage) => postImage.imageID);
sql = `DELETE FROM PostImage WHERE postID = ?;`;
params = [postID];
await this.dbm.execute(sql, params);
if (imageIDs.length > 0) {
sql = `DELETE FROM Image WHERE id IN (?);`;
params = [imageIDs];
await this.dbm.execute(sql, params);
}
}
/**
* Delete a specific image from a post.
*
* @param postID A post's ID.
* @param index The index of the post's image.
* @returns Whether or not the deletion succeeded.
*/
public async deletePostImage(
postID: string,
index: number
): Promise<boolean> {
const images = await this.getPostImages(postID);
if (index >= 0 && index < images.length) {
const sql = `DELETE FROM PostImage WHERE imageID = ?;`;
const params = [images[index].id];
await this.dbm.execute(sql, params);
await this.dbm.imageService.deleteImage(images[index].id);
return true;
} else {
return false;
}
}
}
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