import assert from "node:assert/strict";
import { describe, it } from "node:test";
import {
  createDefaultExternalCsvConfiguration,
  type ExternalCsvColumnMapping,
} from "../src/external-model/csv/external-csv-contracts.js";
import {
  assertExternalCsvConfiguration,
  validateExternalCsvConfiguration,
} from "../src/external-model/csv/external-csv-configuration.js";

const columns: ExternalCsvColumnMapping = {
  ifcGuid: "IfcGUID",
  roomNumber: "Raumnummer",
  roomName: "Raumname",
  familyAndType: "Familie und Typ",
  selectionMarker: "CAx_Auswahlkenner",
  circuitIdentifier: "Stromkreis",
  power: "Elektrische Leistung",
  quantity: "Anzahl",
};

describe("external CSV configuration", () => {
  it("creates the agreed UTF-8, semicolon and watt defaults", () => {
    const configuration = createDefaultExternalCsvConfiguration(columns);

    assert.doesNotThrow(() => assertExternalCsvConfiguration(configuration));
    assert.equal(configuration.encoding, "utf-8");
    assert.equal(configuration.delimiter, ";");
    assert.equal(configuration.powerUnit, "W");
    assert.equal(configuration.wattsPerSourceUnit, 1);
  });

  it("accepts exact family/type rules and additional source mappings", () => {
    const configuration = createDefaultExternalCsvConfiguration(columns);
    configuration.additionalSourceMappings.push({
      sourceColumn: "Montageart",
      targetField: "mountingType",
    });
    configuration.familyTypeRules.push({
      exactFamilyAndType: "_E_CAx Mehrfachsteckdose: Doppelsteckdose",
      internalDeviceType: "Steckdose",
      connectionKind: "socket",
      category: "single_phase",
      quantityRule: { kind: "mapped-column" },
      displayNameSuggestion: { kind: "selection-marker" },
    });

    assert.deepEqual(validateExternalCsvConfiguration(configuration), {
      success: true,
      data: configuration,
    });
  });

  it("rejects ambiguous column and family/type mappings", () => {
    const duplicateColumn = createDefaultExternalCsvConfiguration({
      ...columns,
      quantity: columns.power,
    });
    assert.match(
      validateFailure(duplicateColumn),
      /column is mapped more than once/
    );

    const duplicateRule = createDefaultExternalCsvConfiguration(columns);
    duplicateRule.familyTypeRules = [
      {
        exactFamilyAndType: "Leuchte: Standard",
        internalDeviceType: "Leuchte",
        connectionKind: null,
        category: "lighting",
        quantityRule: { kind: "fixed", quantity: 1 },
        displayNameSuggestion: null,
      },
      {
        exactFamilyAndType: "Leuchte: Standard",
        internalDeviceType: "Leuchte",
        connectionKind: null,
        category: "lighting",
        quantityRule: { kind: "fixed", quantity: 1 },
        displayNameSuggestion: null,
      },
    ];
    assert.match(
      validateFailure(duplicateRule),
      /family\/type rule is duplicated/
    );
  });

  it("rejects unsupported transport values and invalid fixed quantities", () => {
    const configuration = createDefaultExternalCsvConfiguration(columns) as unknown as Record<string, unknown>;
    configuration.encoding = "ansi";
    assert.match(validateFailure(configuration), /encoding must be utf-8/);

    const invalidQuantity = createDefaultExternalCsvConfiguration(columns);
    invalidQuantity.familyTypeRules.push({
      exactFamilyAndType: "Steckdose: Standard",
      internalDeviceType: "Steckdose",
      connectionKind: null,
      category: "single_phase",
      quantityRule: { kind: "fixed", quantity: 0 },
      displayNameSuggestion: { kind: "fixed", value: "Steckdose" },
    });
    assert.match(validateFailure(invalidQuantity), /positive finite number/);
  });

  it("allows a missing quantity column only for fixed quantity rules", () => {
    const configuration = createDefaultExternalCsvConfiguration({
      ...columns,
      quantity: null,
    });
    configuration.familyTypeRules.push({
      exactFamilyAndType: "Steckdose: Standard",
      internalDeviceType: "Steckdose",
      connectionKind: null,
      category: "single_phase",
      quantityRule: { kind: "fixed", quantity: 1 },
      displayNameSuggestion: null,
    });
    assert.equal(validateExternalCsvConfiguration(configuration).success, true);

    configuration.familyTypeRules[0].quantityRule = { kind: "mapped-column" };
    assert.match(validateFailure(configuration), /requires a configured quantity column/);
  });
});

function validateFailure(value: unknown) {
  const result = validateExternalCsvConfiguration(value);
  assert.equal(result.success, false);
  return result.error;
}