import { readFileSync } from "fs";
import TemplateService from "../service/templateService";
import { PermissionModule } from "../type/permissionTypes";
import TemplateUsageService from "../service/templateUsageService";
import Handlebars from "handlebars";

export abstract class TemplateHelper {
  static getTemplateFromFile(template: string) {
    return readFileSync(`${process.cwd()}/src/templates/${template}.template.html`, "utf8");
  }

  static async getTemplateFromStore(templateId: number): Promise<string> {
    return (await TemplateService.getById(templateId)).html;
  }

  static applyDataToTemplate(template: string, data: any): string {
    const normalizedTemplate = this.normalizeTemplate(template);
    const templateCompiled = Handlebars.compile(normalizedTemplate);
    return templateCompiled(data);
  }

  static normalizeTemplate(template: string): string {
    template = template.replace(/<listend>.*?<\/listend>/g, "{{/each}}");
    template = template.replace(/<liststart\b[^>]*>(WDH Start: )?/g, "{{#each ");
    template = template.replace(/<\/liststart>/g, "}}");

    return template;
  }

  static async renderFileForModule({
    module,
    title = "pdf-export Mitgliederverwaltung",
    headerData = {},
    bodyData = {},
    footerData = {},
  }: {
    module: PermissionModule;
    title?: string;
    headerData?: any;
    bodyData?: any;
    footerData?: any;
  }): Promise<{ header: string; body: string; footer: string }> {
    const moduleTemplates = await TemplateUsageService.getByScope(module);

    let header = `<h1 style="font-size:10px; text-align:center; width:100%;">${title}</h1>`;
    let footer = `
      <div style="font-size:10px; text-align:center; width:100%; color:#888;">
        Seite <span class="pageNumber"></span> von <span class="totalPages"></span>
      </div>
    `;
    let body = "";

    if (moduleTemplates.headerId) {
      header = await this.getTemplateFromStore(moduleTemplates.headerId);
      header = this.applyDataToTemplate(header, headerData);
    }

    if (moduleTemplates.footerId) {
      footer = await this.getTemplateFromStore(moduleTemplates.footerId);
      footer = this.applyDataToTemplate(footer, footerData);
    }

    if (moduleTemplates.bodyId) {
      body = await this.getTemplateFromStore(moduleTemplates.bodyId);
    } else {
      body = this.getTemplateFromFile(module);
    }
    body = this.applyDataToTemplate(body, bodyData);

    return {
      header,
      footer,
      body,
    };
  }
}