import { join } from 'path';
import { readFile } from 'fs/promises';
import { getService } from '../utils.mjs';
import { validatePreviewUrl } from './validation/preview.mjs';

const createPreviewController = ()=>{
    return {
        /**
     * Transforms an entry into a preview URL, so that it can be previewed
     * in the Content Manager.
     */ async getPreviewUrl (ctx) {
            const uid = ctx.params.contentType;
            const query = ctx.request.query;
            // Validate the request parameters
            const params = await validatePreviewUrl(strapi, uid, query);
            // TODO: Permissions to preview content
            // Get the preview URL by using the user-defined config handler
            const previewService = getService(strapi, 'preview');
            const url = await previewService.getPreviewUrl(uid, params);
            // If no url is found, set status to 204
            if (!url) {
                ctx.status = 204;
            }
            return {
                data: {
                    url: url || undefined
                }
            };
        },
        /**
     * Serves the standalone preview script verbatim as JavaScript. The admin fetches
     * this, injects the config, and posts it to the preview iframe
     */ async getPreviewScript (ctx) {
            ctx.type = 'application/javascript';
            ctx.body = await readFile(join(__dirname, 'previewScript.js'), 'utf8');
        }
    };
};

export { createPreviewController };
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