import { BadRequestException, ConflictException } from "@nestjs/common";
import { ConfigService } from "@nestjs/config";
import { DataSource } from "typeorm";

import { Invoice } from "../billing/entities/invoice.entity";
import { NotificationsService } from "../notifications/notifications.service";
import { eimsConfig, eimsInvoiceConfig } from "./eims-test-fixtures";
import { EimsAuthService } from "./eims-auth.service";
import { EimsBulkRegistrationService } from "./eims-bulk-registration.service";
import { EimsClientService } from "./eims-client.service";
import { EimsSellerCacheService } from "./eims-seller-cache.service";
import { EimsSystemState } from "./entities/eims-system-state.entity";
import { EimsApiException } from "./eims.errors";
import { EimsInvoiceStatus } from "./eims-registration.types";
import { buildEimsSeller } from "./eims-invoice-context";

const SYSTEM_NUMBER = "B0360154BA";
const INVOICE_A = "11111111-1111-4111-8111-111111111111";
const INVOICE_B = "22222222-2222-4222-8222-222222222222";
const CONVERSATION_ID = "2345678901-1735900502800-c04f8dd6-e6e2-4198-b871-c6e504fc14f5";

const invoiceRow = (over: Partial<Invoice> = {}): Invoice =>
  ({
    id: INVOICE_A,
    invoiceNumber: "INV-20260807-00001",
    currency: "ETB",
    companyId: "company-1",
    issuedAt: new Date(2026, 7, 7, 9, 5, 3),
    totalAmount: "10000.00",
    eimsStatus: EimsInvoiceStatus.NotSubmitted,
    eimsIrn: null,
    eimsDocumentType: "INV",
    eimsBulkConversationId: null,
    company: {
      name: "ABC Trading PLC",
      tin: "0999930000",
      vatNumber: "123475885858",
      phone: "0912345678",
      region: "13",
      zone: "SHA",
      woreda: "574",
      kebele: "03",
      houseNo: "NEW",
      country: "Ethiopia",
    },
    ...over,
  }) as unknown as Invoice;

const LINES = (id: string) => [
  {
    invoiceId: id,
    chargeType: "RAIL_FREIGHT",
    description: "Addis to Djibouti",
    quantity: "1.00",
    unitRate: "10000.00",
    amount: "10000.00",
  },
];

/** In-memory stand-in covering the query/manager surface this service actually calls. */
class FakeDb {
  invoices = new Map<string, Invoice>();
  state: EimsSystemState;
  companyContact: { phone: string | null; email: string | null } | null = null;

  constructor(invoices: Invoice[], state: Partial<EimsSystemState> = {}) {
    for (const inv of invoices) this.invoices.set(inv.id, inv);
    this.state = {
      id: "state-1",
      systemNumber: SYSTEM_NUMBER,
      nextInvoiceCounter: 1,
      nextDocumentNumber: 1,
      previousIrn: null,
      inFlightInvoiceId: null,
      inFlightCounter: null,
      inFlightDocumentNumber: null,
      inFlightConversationId: null,
      blockedReason: null,
      ...state,
    } as EimsSystemState;
  }

  private matches(entity: Invoice | EimsSystemState, where: Record<string, unknown>): boolean {
    return Object.entries(where).every(([key, value]) => (entity as never)[key] === value);
  }

  private queryBuilder(entityCtor: unknown) {
    let where: Record<string, unknown> = {};
    const builder = {
      setLock: () => builder,
      where: (_clause: string, params: Record<string, unknown>) => {
        where = { ...where, ...this.normalizeParams(params) };
        return builder;
      },
      andWhere: (_clause: string, params: Record<string, unknown>) => {
        where = { ...where, ...this.normalizeParams(params) };
        return builder;
      },
      getOne: async () => this.find(entityCtor, where)[0] ?? null,
      getMany: async () => this.find(entityCtor, where),
    };
    return builder;
  }

  private normalizeParams(params: Record<string, unknown>): Record<string, unknown> {
    // Test-only mapping from the SQL param names used in the service's own queries to entity fields.
    const map: Record<string, string> = {
      invoiceId: "id",
      systemNumber: "systemNumber",
      id: "eimsBulkConversationId",
    };
    const out: Record<string, unknown> = {};
    for (const [k, v] of Object.entries(params)) out[map[k] ?? k] = v;
    return out;
  }

  private find(entityCtor: unknown, where: Record<string, unknown>): Array<Invoice | EimsSystemState> {
    const isState = entityCtor === EimsSystemState;
    const pool: Array<Invoice | EimsSystemState> = isState ? [this.state] : [...this.invoices.values()];
    return pool.filter((e) => this.matches(e, where));
  }

  private manager = {
    createQueryBuilder: (entityCtor: unknown) => this.queryBuilder(entityCtor),
    query: async () => [],
    findOne: async (entityCtor: unknown, options: { where: Record<string, unknown> }) =>
      this.find(entityCtor, options.where)[0] ?? null,
    update: async (entityCtor: unknown, idOrWhere: string | Record<string, unknown>, patch: Record<string, unknown>) => {
      const targets =
        typeof idOrWhere === "string"
          ? this.find(entityCtor, { id: idOrWhere })
          : this.find(entityCtor, idOrWhere);
      for (const t of targets) Object.assign(t, patch);
      return { affected: targets.length };
    },
    getRepository: (entityCtor: unknown) => ({
      findOne: async (options: { where: { id: string } }) => this.find(entityCtor, { id: options.where.id })[0] ?? null,
    }),
  };

  asDataSource(): DataSource {
    return {
      manager: this.manager,
      // Routed by SQL text: the lines lookup and sendCompanyChannels' contact lookup share this
      // one entry point in the real DataSource.
      query: async (sql: string) => {
        if (sql.includes("invoice_lines")) {
          return [...this.invoices.keys()].flatMap((id) => LINES(id));
        }
        return this.companyContact ? [this.companyContact] : [];
      },
      transaction: async (body: (m: unknown) => Promise<unknown>) => body(this.manager),
      getRepository: () => ({
        find: async (options: { where: { id: { value: string[] } } }) => {
          const ids = options.where.id.value ?? [];
          return ids.map((id: string) => this.invoices.get(id)).filter(Boolean);
        },
        createQueryBuilder: (alias: string) => {
          void alias;
          return this.queryBuilder(Invoice);
        },
        count: async (options: { where: Record<string, unknown> }) => this.find(Invoice, options.where).length,
      }),
    } as unknown as DataSource;
  }
}

const build = (db: FakeDb, postSigned: jest.Mock, directSend: jest.Mock = jest.fn().mockResolvedValue(undefined)) =>
  new EimsBulkRegistrationService(
    db.asDataSource(),
    { get: () => eimsConfig({ invoice: eimsInvoiceConfig() }) } as unknown as ConfigService,
    { postSigned } as unknown as EimsClientService,
    { getSessionContext: async () => ({ systemNumber: SYSTEM_NUMBER, systemType: "SYS" }) } as unknown as EimsAuthService,
    { directSend } as unknown as NotificationsService,
    { getSellerDetails: (c: unknown) => buildEimsSeller(c as never) } as unknown as EimsSellerCacheService,
  );

const accepted = (conversationId = CONVERSATION_ID) => ({ conversationId, status: 202 });

describe("EimsBulkRegistrationService.registerBulk", () => {
  it("reserves sequential counters, sends one signed array, and claims MoR's real conversation id", async () => {
    const db = new FakeDb(
      [invoiceRow(), invoiceRow({ id: INVOICE_B, invoiceNumber: "INV-20260807-00002" })],
      { nextInvoiceCounter: 5, nextDocumentNumber: 5, previousIrn: "prev-irn" },
    );
    const postSigned = jest.fn().mockResolvedValue(accepted());

    const result = await build(db, postSigned).registerBulk([INVOICE_A, INVOICE_B]);

    expect(result).toEqual({ conversationId: CONVERSATION_ID, accepted: [INVOICE_A, INVOICE_B], alreadyRegistered: [] });
    const [, request] = postSigned.mock.calls[0];
    expect(request).toHaveLength(2);
    expect(request[0].SourceSystem.InvoiceCounter).toBe(5);
    expect(request[0].DocumentDetails.DocumentNumber).toBe("5");
    expect(request[0].ReferenceDetails.PreviousIrn).toBe("prev-irn");
    expect(request[1].SourceSystem.InvoiceCounter).toBe(6);
    // Only the first item in a bulk batch chains — the rest have no IRN to reference yet.
    expect(request[1].ReferenceDetails.PreviousIrn).toBe("");

    expect(db.invoices.get(INVOICE_A)).toMatchObject({ eimsStatus: EimsInvoiceStatus.Submitting, eimsBulkConversationId: CONVERSATION_ID });
    expect(db.invoices.get(INVOICE_B)).toMatchObject({ eimsStatus: EimsInvoiceStatus.Submitting, eimsBulkConversationId: CONVERSATION_ID });
    expect(db.state.nextInvoiceCounter).toBe(7);
    expect(db.state.inFlightConversationId).toBe(CONVERSATION_ID);
  });

  it("skips an already-registered invoice, without consuming a counter for it", async () => {
    const db = new FakeDb([
      invoiceRow({ eimsIrn: "already-irn", eimsStatus: EimsInvoiceStatus.Registered }),
      invoiceRow({ id: INVOICE_B, invoiceNumber: "INV-20260807-00002" }),
    ]);
    const postSigned = jest.fn().mockResolvedValue(accepted());

    const result = await build(db, postSigned).registerBulk([INVOICE_A, INVOICE_B]);

    expect(result.alreadyRegistered).toEqual([INVOICE_A]);
    expect(result.accepted).toEqual([INVOICE_B]);
    const [, request] = postSigned.mock.calls[0];
    expect(request).toHaveLength(1);
  });

  it("refuses the whole batch — no reservation, no HTTP call — when a DEB note has no registered original", async () => {
    const db = new FakeDb([
      invoiceRow({ eimsDocumentType: "DEB", relatedInvoice: { eimsIrn: null, invoiceNumber: "INV-orig" } as never }),
    ]);
    const postSigned = jest.fn();

    await expect(build(db, postSigned).registerBulk([INVOICE_A])).rejects.toBeInstanceOf(BadRequestException);
    expect(postSigned).not.toHaveBeenCalled();
    expect(db.state.inFlightConversationId).toBeNull();
  });

  it("refuses when a single-invoice submission is already in flight", async () => {
    const db = new FakeDb([invoiceRow()], { inFlightInvoiceId: "some-other-invoice" });
    await expect(build(db, jest.fn()).registerBulk([INVOICE_A])).rejects.toBeInstanceOf(ConflictException);
  });

  it("refuses when another bulk batch is already in flight", async () => {
    const db = new FakeDb([invoiceRow()], { inFlightConversationId: "other-conversation" });
    await expect(build(db, jest.fn()).registerBulk([INVOICE_A])).rejects.toBeInstanceOf(ConflictException);
  });

  it("a deterministic rejection rolls back the whole block and clears the in-flight marker", async () => {
    const db = new FakeDb(
      [invoiceRow(), invoiceRow({ id: INVOICE_B, invoiceNumber: "INV-20260807-00002" })],
      { nextInvoiceCounter: 5, nextDocumentNumber: 5 },
    );
    const postSigned = jest.fn().mockRejectedValue(new EimsApiException("SCHEMA_VALIDATION", "bad", 400));

    await expect(build(db, postSigned).registerBulk([INVOICE_A, INVOICE_B])).rejects.toBeInstanceOf(EimsApiException);

    expect(db.state.nextInvoiceCounter).toBe(5);
    expect(db.state.nextDocumentNumber).toBe(5);
    expect(db.state.inFlightConversationId).toBeNull();
    expect(db.invoices.get(INVOICE_A)?.eimsStatus).toBe(EimsInvoiceStatus.Failed);
    expect(db.invoices.get(INVOICE_A)?.eimsBulkConversationId).toBeNull();
  });

  it("an ambiguous failure blocks the system number and leaves counters consumed", async () => {
    const db = new FakeDb([invoiceRow()], { nextInvoiceCounter: 5, nextDocumentNumber: 5 });
    const postSigned = jest.fn().mockRejectedValue(new EimsApiException("TIMEOUT", "timed out"));

    await expect(build(db, postSigned).registerBulk([INVOICE_A])).rejects.toBeInstanceOf(EimsApiException);

    expect(db.state.nextInvoiceCounter).toBe(6);
    expect(db.state.blockedReason).toMatch(/never acknowledged/);
    expect(db.invoices.get(INVOICE_A)?.eimsStatus).toBe(EimsInvoiceStatus.Unknown);
  });

  it("refuses an empty invoice list", async () => {
    const db = new FakeDb([invoiceRow()]);
    await expect(build(db, jest.fn()).registerBulk([])).rejects.toBeInstanceOf(BadRequestException);
  });
});

describe("EimsBulkRegistrationService.handleBulkCallback", () => {
  const submittingRow = (over: Partial<Invoice>) =>
    invoiceRow({
      eimsStatus: EimsInvoiceStatus.Submitting,
      eimsBulkConversationId: CONVERSATION_ID,
      ...over,
    });

  it("settles a mixed success/error callback, advancing previousIrn to the last accepted item", async () => {
    const db = new FakeDb(
      [
        submittingRow({ eimsInvoiceCounter: 5, eimsDocumentNumber: "5" }),
        submittingRow({ id: INVOICE_B, invoiceNumber: "INV-20260807-00002", eimsInvoiceCounter: 6, eimsDocumentNumber: "6" }),
      ],
      { inFlightConversationId: CONVERSATION_ID },
    );

    const results = await build(db, jest.fn()).handleBulkCallback([
      { irn: "irn-a", status: "A", documentNumber: "5" },
      { ruleError: [{ portion: "DocumentDetails", errorMessage: ["bad date"] }], status: "ERROR", docNo: "6" },
      { conversionId: CONVERSATION_ID },
    ]);

    expect(db.invoices.get(INVOICE_A)).toMatchObject({ eimsStatus: EimsInvoiceStatus.Registered, eimsIrn: "irn-a" });
    expect(db.invoices.get(INVOICE_B)).toMatchObject({ eimsStatus: EimsInvoiceStatus.Failed });
    expect(db.state.previousIrn).toBe("irn-a");
    expect(db.state.inFlightConversationId).toBeNull();
    expect(results).toEqual(
      expect.arrayContaining([
        expect.objectContaining({ invoiceId: INVOICE_A, success: true, irn: "irn-a" }),
        expect.objectContaining({ invoiceId: INVOICE_B, success: false }),
      ]),
    );
  });

  it("ignores a callback for an unknown or already-settled conversation", async () => {
    const db = new FakeDb([invoiceRow()]);
    const results = await build(db, jest.fn()).handleBulkCallback([
      { irn: "irn-x", status: "A", documentNumber: "1" },
      { conversionId: "no-such-conversation" },
    ]);
    expect(results).toEqual([]);
  });

  it("does not clear the in-flight marker while another invoice in the batch is still submitting", async () => {
    const db = new FakeDb(
      [
        submittingRow({ eimsInvoiceCounter: 5, eimsDocumentNumber: "5" }),
        submittingRow({ id: INVOICE_B, invoiceNumber: "INV-20260807-00002", eimsInvoiceCounter: 6, eimsDocumentNumber: "6" }),
      ],
      { inFlightConversationId: CONVERSATION_ID },
    );

    // Callback only reports on one of the two invoices in this batch.
    await build(db, jest.fn()).handleBulkCallback([
      { irn: "irn-a", status: "A", documentNumber: "5" },
      { conversionId: CONVERSATION_ID },
    ]);

    expect(db.state.inFlightConversationId).toBe(CONVERSATION_ID);
  });

  it("reports the current state without re-settling an invoice that already resolved", async () => {
    const db = new FakeDb(
      [
        invoiceRow({
          eimsStatus: EimsInvoiceStatus.Registered,
          eimsIrn: "irn-a",
          eimsDocumentNumber: "1",
          eimsBulkConversationId: CONVERSATION_ID,
        }),
      ],
      { inFlightConversationId: CONVERSATION_ID },
    );

    const results = await build(db, jest.fn()).handleBulkCallback([
      { irn: "irn-a", status: "A", documentNumber: "1" },
      { conversionId: CONVERSATION_ID },
    ]);

    expect(results).toEqual([
      expect.objectContaining({ invoiceId: INVOICE_A, success: true, message: expect.stringContaining("Already settled") }),
    ]);
  });
});