import { PdfFile } from '../../wrappers/PdfFile';

export async function sortPdfs(
        files: PdfFile[],
        sortType: "orderProvided"|"byFileName"|"byDateModified"|"byDateCreated"|"byPDFTitle" = "orderProvided"
    ): Promise<PdfFile[]> {
    
    const docCache = await PdfFile.cacheAsPdfLibDocuments(files);

    switch(sortType) {
        case "byFileName":
            files.sort((a, b) => {
                if (!a || !b) return 0;
                const ad = a.filename, bd = b.filename;
                if (!ad || !bd) return 0;
                return ad.localeCompare(bd);
            });
            break;
        case "byDateModified":
            files.sort((a, b) => {
                const ad = docCache.get(a)?.getModificationDate()?.getTime();
                const bd = docCache.get(b)?.getModificationDate()?.getTime();
                if (!ad || !bd) return 0;
                return ad > bd ? 1 : -1
            });
            break;
        case "byDateCreated":
            files.sort((a, b) => {
                const ad = docCache.get(a)?.getCreationDate()?.getTime();
                const bd = docCache.get(b)?.getCreationDate()?.getTime();
                if (!ad || !bd) return 0;
                return ad > bd ? 1 : -1
            });
            break;
        case "byPDFTitle":
            files.sort((a, b) => {
                const ad = docCache.get(a)?.getTitle();
                const bd = docCache.get(b)?.getTitle();
                if (!ad || !bd) return 0;
                return ad.localeCompare(bd);
            });
            break;
    }
    
    return files;
}