make a contrat template

apps/edr-freight-api/src/modules/contract-templates/contract-templates.service.ts

@@ -0,0 +1,276 @@
+import { BadRequestException, Injectable, NotFoundException } from "@nestjs/common";
+import { randomUUID } from "node:crypto";
+
+import { ContractRendererService } from "../../contracts/contract-renderer.service";
+import { getTemplateMeta } from "../../contracts/contract-template.registry";
+import {
+  ContractDynamicTemplateView,
+  ContractViewModel,
+} from "../../contracts/contract-view-model.builder";
+import { ContractTemplatesRepository } from "./contract-templates.repository";
+import {
+  CreateArticleDto,
+  PreviewContractTemplateDto,
+  ReplaceArticleDto,
+  UpdateArticleDto,
+  UpdateContractTemplateDto,
+} from "./dto/contract-template.dto";
+import {
+  CONTRACT_TEMPLATE_CODES,
+  ContractTemplate,
+  ContractTemplateArticle,
+  ContractTemplateCode,
+  contractTemplateCodeFor,
+} from "./entities/contract-template.entity";
+
+/** Registry keys used to derive labels for the mock preview per template code. */
+const PREVIEW_TEMPLATE_KEYS: Record<ContractTemplateCode, string> = {
+  IMPORT_BULK: "IMP_BULK_USD_FORWARDING",
+  EXPORT_BULK: "EXP_BULK_USD_TRANSPORT_ONLY",
+  INTERCITY_BULK: "DOM_BULK_USD_TRANSPORT_ONLY",
+  IMPORT_CONTAINER: "IMP_CON_USD_TRANSPORT_ONLY",
+  EXPORT_CONTAINER: "EXP_CON_USD_FORWARDING",
+  INTERCITY_CONTAINER: "DOM_CON_USD_TRANSPORT_ONLY",
+};
+
+@Injectable()
+export class ContractTemplatesService {
+  constructor(
+    private readonly repository: ContractTemplatesRepository,
+    private readonly renderer: ContractRendererService,
+  ) {}
+
+  async list(): Promise<ContractTemplate[]> {
+    const templates = await this.repository.findAll();
+    const rank = new Map(CONTRACT_TEMPLATE_CODES.map((code, i) => [code, i] as const));
+    return templates.sort(
+      (a, b) => (rank.get(a.code) ?? 99) - (rank.get(b.code) ?? 99),
+    );
+  }
+
+  async getByCode(code: string): Promise<ContractTemplate> {
+    const template = await this.repository.findByCode(this.assertCode(code));
+    if (!template) {
+      throw new NotFoundException(`Contract template ${code} not found`);
+    }
+    return template;
+  }
+
+  /**
+   * The active template used when generating a contract document for the given
+   * direction/freight pair; null when missing or deactivated (the renderer then
+   * falls back to the built-in generic layout).
+   */
+  async findActiveForContract(
+    tradeDirection?: string | null,
+    freightType?: string | null,
+  ): Promise<ContractTemplate | null> {
+    const code = contractTemplateCodeFor(tradeDirection, freightType);
+    const template = await this.repository.findByCode(code);
+    return template?.isActive ? template : null;
+  }
+
+  async update(code: string, dto: UpdateContractTemplateDto): Promise<ContractTemplate> {
+    const template = await this.getByCode(code);
+    if (dto.name !== undefined) template.name = dto.name;
+    if (dto.description !== undefined) template.description = dto.description;
+    if (dto.documentTitle !== undefined) template.documentTitle = dto.documentTitle;
+    if (dto.whereasClauses !== undefined) template.whereasClauses = dto.whereasClauses;
+    if (dto.isActive !== undefined) template.isActive = dto.isActive;
+    return this.repository.saveTemplate(template);
+  }
+
+  async addArticle(code: string, dto: CreateArticleDto): Promise<ContractTemplate> {
+    const template = await this.getByCode(code);
+    const articles = this.sorted(template.articles);
+    const article: ContractTemplateArticle = {
+      id: randomUUID(),
+      title: dto.title,
+      body: dto.body,
+      order: 0,
+    };
+    const index =
+      dto.position && dto.position <= articles.length ? dto.position - 1 : articles.length;
+    articles.splice(index, 0, article);
+    template.articles = this.renumber(articles);
+    return this.repository.saveTemplate(template);
+  }
+
+  async updateArticle(
+    code: string,
+    articleId: string,
+    dto: UpdateArticleDto,
+  ): Promise<ContractTemplate> {
+    const template = await this.getByCode(code);
+    const article = template.articles.find((item) => item.id === articleId);
+    if (!article) {
+      throw new NotFoundException(`Article ${articleId} not found on template ${code}`);
+    }
+    if (dto.title !== undefined) article.title = dto.title;
+    if (dto.body !== undefined) article.body = dto.body;
+    template.articles = this.renumber(this.sorted(template.articles));
+    return this.repository.saveTemplate(template);
+  }
+
+  async removeArticle(code: string, articleId: string): Promise<ContractTemplate> {
+    const template = await this.getByCode(code);
+    const remaining = template.articles.filter((item) => item.id !== articleId);
+    if (remaining.length === template.articles.length) {
+      throw new NotFoundException(`Article ${articleId} not found on template ${code}`);
+    }
+    template.articles = this.renumber(this.sorted(remaining));
+    return this.repository.saveTemplate(template);
+  }
+
+  /** Replace the full ordered article list (also how the editor reorders). */
+  async replaceArticles(
+    code: string,
+    articles: ReplaceArticleDto[],
+  ): Promise<ContractTemplate> {
+    const template = await this.getByCode(code);
+    template.articles = this.renumber(
+      articles.map((item) => ({
+        id: item.id ?? randomUUID(),
+        title: item.title,
+        body: item.body,
+        order: 0,
+      })),
+    );
+    return this.repository.saveTemplate(template);
+  }
+
+  /**
+   * Render the template against a representative mock contract so admins can
+   * see the final document without touching a real contract. Draft overrides
+   * allow previewing unsaved editor state.
+   */
+  async preview(
+    code: string,
+    overrides?: PreviewContractTemplateDto,
+  ): Promise<{ html: string }> {
+    const template = await this.getByCode(code);
+
+    const dynamicTemplate: ContractDynamicTemplateView = {
+      code: template.code,
+      name: overrides?.name ?? template.name,
+      documentTitle: overrides?.documentTitle ?? template.documentTitle,
+      whereasClauses: overrides?.whereasClauses ?? template.whereasClauses,
+      articles: overrides?.articles
+        ? overrides.articles.map((item, index) => ({
+            id: item.id ?? randomUUID(),
+            title: item.title,
+            body: item.body,
+            order: index + 1,
+          }))
+        : this.sorted(template.articles),
+    };
+
+    const view = this.buildMockView(template.code, dynamicTemplate);
+    return { html: this.renderer.render(view) };
+  }
+
+  private buildMockView(
+    code: ContractTemplateCode,
+    dynamicTemplate: ContractDynamicTemplateView,
+  ): ContractViewModel {
+    const meta = getTemplateMeta(PREVIEW_TEMPLATE_KEYS[code]);
+    const isBulk = code.endsWith("_BULK");
+    const now = new Date();
+
+    const unitRates = isBulk
+      ? [
+          { label: "Rail transport — per metric ton", unitPrice: 59.4, unit: "ton", currency: "USD" },
+          { label: "Origin handling and documentation", unitPrice: 18, unit: "ton", currency: "USD" },
+          { label: "Lashing material (when provided by EDR)", unitPrice: 150, unit: "unit", currency: "USD" },
+        ]
+      : [
+          { label: "Rail transport — 40ft container", unitPrice: 1916, unit: "container", currency: "USD" },
+          { label: "Rail transport — 2 × 20ft containers", unitPrice: 1944, unit: "container", currency: "USD" },
+          { label: "Excess tonnage surcharge", unitPrice: 10, unit: "ton", currency: "USD" },
+        ];
+
+    return {
+      bookingId: "00000000-0000-0000-0000-000000000000",
+      reference: "EDR/CT/2026/0042",
+      status: "CONTRACT_READY",
+      templateKey: PREVIEW_TEMPLATE_KEYS[code],
+      template: { ...meta, title: dynamicTemplate.name, templateFile: "edr-dynamic.hbs" },
+      contractDate: now.toLocaleDateString("en-GB", {
+        day: "numeric",
+        month: "long",
+        year: "numeric",
+      }),
+      contractYear: now.getFullYear(),
+      client: {
+        companyName: "Abyssinia Trading PLC",
+        companyAddress: "Bole Sub-city, Woreda 03, H.No 1234, Addis Ababa",
+        companyLocation: "Ethiopia",
+        phone: "+251 91 123 4567",
+        email: "logistics@abyssiniatrading.et",
+        tinNumber: "0011223344",
+        vatNumber: "VAT-556677",
+        fanNumber: "FAN-889900",
+        businessLicense: "BL/AA/12/345678",
+      },
+      provider: {
+        name: "Ethio-Djibouti Standard Gauge Railway Share Company",
+        address: "Nifas Silk Lafto Sub City, Addis Ababa, Ethiopia",
+        phone: "+251 11 872 0000",
+        email: "info@edr.gov.et",
+        tinNumber: "—",
+      },
+      schedule: {
+        originLabel: isBulk ? "Nagad Railway Station" : "SGTD Freight Station",
+        destinationLabel: "Galaan Multipurpose Port (GMP)",
+        tradeDirection: code.startsWith("IMPORT")
+          ? "IMPORT"
+          : code.startsWith("EXPORT")
+            ? "EXPORT"
+            : "DOMESTIC",
+        freightType: isBulk ? "BULK" : "CONTAINER",
+        serviceType: "Rail transport and customs clearance",
+        scheduledDate: "—",
+        contractType: "GENERAL",
+        cargoDescription: isBulk ? "Steel billets — 2,800 MT" : "40ft containers — FMCG cargo",
+        totalWeightVgm: "—",
+        equipmentReturn: isBulk ? "—" : "With empty return",
+        hazardousLabel: "No",
+        firstMilePickupAddress: "—",
+        lastMileDeliveryAddress: "—",
+      },
+      pricing: {
+        displayMode: "UNIT_RATES",
+        unitRates,
+        currency: "USD",
+        equipmentReturn: isBulk ? "—" : "With empty return",
+        originLabel: isBulk ? "Nagad Railway Station" : "SGTD Freight Station",
+        destinationLabel: "Galaan Multipurpose Port (GMP)",
+      } as unknown as ContractViewModel["pricing"],
+      signatures: [],
+      canSignCustomer: false,
+      canSignStaff: false,
+      hasContractDocument: false,
+      hasCustomerSignature: false,
+      hasStaffSignature: false,
+      dynamicTemplate,
+    };
+  }
+
+  private assertCode(code: string): ContractTemplateCode {
+    const upper = code?.toUpperCase() as ContractTemplateCode;
+    if (!CONTRACT_TEMPLATE_CODES.includes(upper)) {
+      throw new BadRequestException(
+        `Unknown contract template code "${code}". Valid codes: ${CONTRACT_TEMPLATE_CODES.join(", ")}`,
+      );
+    }
+    return upper;
+  }
+
+  private sorted(articles: ContractTemplateArticle[]): ContractTemplateArticle[] {
+    return [...(articles ?? [])].sort((a, b) => (a.order ?? 0) - (b.order ?? 0));
+  }
+
+  private renumber(articles: ContractTemplateArticle[]): ContractTemplateArticle[] {
+    return articles.map((article, index) => ({ ...article, order: index + 1 }));
+  }
+}