"use strict";

/** Coordinate CMap import and export workflows without owning their formats. */
export class CmapTransferController {
  constructor({ repository, jsonImporter, jsonExporter, markdownExporter,
    getCurrentMap, getPages, getConceptMaps, loadPages, loadConceptMaps,
    navigateToMap, saveBeforeTransfer, confirm, status, translate }) {
    Object.assign(this, {
      repository, jsonImporter, jsonExporter, markdownExporter, getCurrentMap,
      getPages, getConceptMaps, loadPages, loadConceptMaps, navigateToMap,
      saveBeforeTransfer, confirm, status, translate
    });
  }

  /** Save pending changes, then create the requested readable Markdown export. */
  async exportMarkdown(options) {
    const map = this.getCurrentMap();
    if (!map) throw new Error(this.translate("cmap-export-unavailable", "CMap export is unavailable."));
    await this.saveBeforeTransfer();
    return this.markdownExporter.export(map, options);
  }

  /** Save pending changes, then create the requested portable JSON bundle. */
  async exportJson(depth) {
    const map = this.getCurrentMap();
    if (!map) throw new Error(this.translate("cmap-json-unavailable", "CMap JSON export is unavailable."));
    await this.saveBeforeTransfer();
    return this.jsonExporter.export(map, depth);
  }

  /**
   * goal   : Import a validated CMap bundle after presenting replacement conflicts.
   * post   : Page and CMap catalogues are refreshed and navigation opens the imported root CMap.
   * result : The importer summary.
   */
  async importFile(file) {
    const bundle = await this.jsonImporter.read(file);
    await this.saveBeforeTransfer();
    const conflicts = this.jsonImporter.conflicts(bundle, this.getPages(), this.getConceptMaps());
    const replaceExisting = (conflicts.pages.length || conflicts.conceptMaps.length) && this.confirm(
      this.translate("cmap-import-conflicts", "The import contains existing CMaps or pages. Replace them?"));
    const result = await this.jsonImporter.import(bundle, {
      pages: this.getPages(), conceptMaps: this.getConceptMaps(), replaceExisting,
      summary: this.translate("imported-from-cmap-json", "Imported from CMap JSON")
    });
    await this.loadPages();
    await this.loadConceptMaps();
    await this.navigateToMap(bundle.rootCmapSlug);
    return result;
  }
}