import { formscreen } from "./formscreen";
import { database } from "./database.js";
import { autocomplete_database } from "./autocomplete_database.js";
import { import_loop } from "./import_loop.js";
import { searcher } from "./searcher.js";
import { import_log } from "./import_log.js";
import { downloader } from "./downloader.js";

export class import_products extends formscreen {
    #file;
    #content;

    get _name() {
        return "Import products JSON";
    }

    _build_form() {
        this._create_input("file", "Database:", "", (input) => {
            this.#file = input;
            input.type = "file";
            input.accept = "application/json";
        });
    }

    async #load_file() {
        if (this.#file.files.length === 0) {
            throw new Error("Select JSON products database first.");
        }

        const file = this.#file.files.item(0);
        const text = await file.text();
        
        return JSON.parse(text);
    }

    async _process() {
        try {
            this._info = "Loading file...";
            this.#content = await this.#load_file();
            this._info = "Parsing file to dataset...";
            
            const result = new import_log();

            const dataset = new database(this.#content)
            .on_skip((fail) => {
                this._info = "Skipping " + fail.product.barcode + "...";
                result.skip(fail);
            })
            .process()
            .results();

            const loop = new import_loop(dataset)
            .on_autocomplete((target) => {
                this._info = "Searching for " + target.barcode + "...";
            })
            .on_create((target) => {
                this._info = "Creating " + target.barcode + "...";
            })
            .on_single_fail((target) => {
                this._info = "Can not add " + target.product.barcode + "...";
                result.fail(target);
            })
            .on_skip((target) => {
                this._info = "Skipping " + target.product.barcode + "...";
                result.skip(target);
            })
            .on_single_success((target) => {
                this._info = "Created " + target.barcode + " success.";
            })
            .finally(() => {
                searcher.reload();

                const log = new downloader()
                .content(result.content())
                .type("text/plain")
                .encode("utf-8")
                .name("import-json.log")
                .process();
                
                if (result.length === 0) {
                    this._success = "All items imported.";

                    setTimeout(() => {
                        this.hide();
                    });
                } else {
                    this._success = "Not all items imported...";
                }
            })
            .process();
        } catch (error) {
            this._error = new String(error);
        }        
    }
}