import assert from "node:assert/strict";
import { describe, it } from "node:test";
import {
  buildCellClipboard,
  formatCellEditText,
  planCellWrites,
  resolveClipboardCells,
  resolvePasteWrites,
} from "../src/frontend/utils/circuit-grid-clipboard.js";
import { buildVisibleGridRowsWithStructure } from "../src/frontend/utils/circuit-grid-projection.js";
import type {
  CircuitTreeCircuitDto,
  CircuitTreeDeviceRowDto,
  CircuitTreeSectionDto,
} from "../src/frontend/types.js";

function makeDevice(id: string, powerPerUnit: number): CircuitTreeDeviceRowDto {
  return {
    id,
    sortOrder: 10,
    name: `Gerät ${id}`,
    displayName: `Gerät ${id}`,
    phaseType: "single_phase",
    quantity: 1,
    manualQuantity: 1,
    powerPerUnit,
    simultaneityFactor: 1,
    rowTotalPower: powerPerUnit,
  };
}

function makeCircuit(
  id: string,
  deviceRows: CircuitTreeDeviceRowDto[],
  extra: Partial<CircuitTreeCircuitDto> = {}
): CircuitTreeCircuitDto {
  return {
    id,
    circuitListId: "list-1",
    sectionId: "section-1",
    equipmentIdentifier: `-2F${id.slice(-1)}`,
    displayName: id,
    sortOrder: 10,
    isReserve: deviceRows.length === 0,
    circuitTotalPower: 0,
    circuitApparentPower: 0,
    circuitCosPhi: 1,
    deviceRows,
    downstreamBoardLoads: [],
    ...extra,
  };
}

const source = makeCircuit("circuit-1", [makeDevice("row-1", 0.25)], {
  cableType: "NYM-J",
  cableCrossSection: "3x2,5",
  cableLength: 18,
  protectionDevice: { type: "LS", ratedCurrentA: 16, tripCharacteristic: "B" },
});
const target = makeCircuit("circuit-2", [makeDevice("row-2", 0.1)], {
  protectionDevice: { type: "LS", ratedCurrentA: 10, tripCharacteristic: "B" },
});
const multi = makeCircuit("circuit-3", [
  makeDevice("row-3a", 0.1),
  makeDevice("row-3b", 0.2),
]);
const reserve = makeCircuit("circuit-4", []);

const sections: CircuitTreeSectionDto[] = [
  {
    id: "section-1",
    key: "single_phase",
    displayName: "Einphasig",
    prefix: "-2F",
    sortOrder: 10,
    sectionTotalPower: 0,
    components: [],
    circuits: [source, target, multi, reserve],
  },
];
const rows = buildVisibleGridRowsWithStructure(sections, {
  headerComponents: [],
  footerComponents: [],
});
const rowByKey = (rowKey: string) => {
  const row = rows.find((entry) => entry.rowKey === rowKey);
  assert.ok(row, rowKey);
  return row;
};

describe("circuit grid clipboard", () => {
  it("formats numbers with a decimal comma for editing and copying", () => {
    assert.equal(formatCellEditText(0.25), "0,25");
    assert.equal(formatCellEditText(1500), "1500");
    assert.equal(formatCellEditText(true), "ja");
    assert.equal(formatCellEditText(undefined), "");
  });

  it("copies protection and cable summaries as complete circuit records", () => {
    const clipboard = buildCellClipboard(
      [rowByKey("circuitCompact:circuit-1")],
      ["protectionSummary"]
    );
    assert.equal(clipboard.cells[0][0].kind, "protection");
    const plan = planCellWrites([
      {
        row: rowByKey("circuitCompact:circuit-2"),
        cellKey: "protectionSummary",
        value: clipboard.cells[0][0],
      },
      {
        row: rowByKey("circuitCompact:circuit-2"),
        cellKey: "cableSummary",
        value: buildCellClipboard(
          [rowByKey("circuitCompact:circuit-1")],
          ["cableSummary"]
        ).cells[0][0],
      },
    ]);
    assert.equal(plan.changedCellCount, 2);
    assert.deepEqual(
      plan.updates.map((update) => [update.type, update.payload]),
      [
        [
          "circuit.update",
          {
            circuitId: "circuit-2",
            changes: [
              { field: "cableType", value: "NYM-J" },
              { field: "cableCrossSection", value: "3x2,5" },
              { field: "cableLength", value: 18 },
            ],
          },
        ],
        [
          "circuit-protection.update",
          {
            circuitId: "circuit-2",
            expected: {
              circuitId: "circuit-2",
              type: "LS",
              ratedCurrentA: 10,
              fuseUtilizationCategory: null,
              tripCharacteristic: "B",
              rcdType: null,
              ratedResidualCurrentMa: null,
            },
            target: {
              circuitId: "circuit-2",
              type: "LS",
              ratedCurrentA: 16,
              fuseUtilizationCategory: null,
              tripCharacteristic: "B",
              rcdType: null,
              ratedResidualCurrentMa: null,
            },
          },
        ],
      ]
    );
  });

  it("fills one value into every selected row and skips rows that cannot take it", () => {
    const selectedRowKeys = [
      "circuitCompact:circuit-1",
      "circuitCompact:circuit-2",
      "circuitSummary:circuit-3",
      "device:row-3a",
    ];
    const { writes } = resolvePasteWrites({
      cells: resolveClipboardCells("0,5", null),
      anchor: { rowKey: "circuitCompact:circuit-1", cellKey: "powerPerUnit" },
      selectedRowKeys,
      rows,
      columnKeys: ["equipmentIdentifier", "displayName", "powerPerUnit"],
    });
    assert.equal(writes.length, 4);
    const plan = planCellWrites(writes);
    // The summary row of a multi-device circuit has no device power.
    assert.equal(plan.skippedCellCount, 1);
    assert.deepEqual(
      plan.updates.map((update) => [update.type, update.payload]),
      ["row-1", "row-2", "row-3a"].map((rowId) => [
        "circuit-device-row.update",
        { rowId, changes: [{ field: "powerPerUnit", value: 0.5 }] },
      ])
    );
  });

  it("pastes an Excel block down the visible rows and across visible columns", () => {
    const cells = resolveClipboardCells("0,3\t0,8\r\n0,4\t0,9\r\n", null);
    const { writes, overflowCellCount } = resolvePasteWrites({
      cells,
      anchor: { rowKey: "circuitCompact:circuit-1", cellKey: "powerPerUnit" },
      selectedRowKeys: [],
      rows,
      columnKeys: ["displayName", "powerPerUnit", "simultaneityFactor"],
    });
    assert.equal(overflowCellCount, 0);
    const plan = planCellWrites(writes);
    assert.deepEqual(
      plan.updates.map((update) => update.payload),
      [
        {
          rowId: "row-1",
          changes: [
            { field: "powerPerUnit", value: 0.3 },
            { field: "simultaneityFactor", value: 0.8 },
          ],
        },
        {
          rowId: "row-2",
          changes: [
            { field: "powerPerUnit", value: 0.4 },
            { field: "simultaneityFactor", value: 0.9 },
          ],
        },
      ]
    );
  });

  it("reuses structured cells only while the clipboard text is unchanged", () => {
    const clipboard = buildCellClipboard(
      [rowByKey("circuitCompact:circuit-1")],
      ["protectionSummary"]
    );
    assert.equal(
      resolveClipboardCells(clipboard.text, clipboard)[0][0].kind,
      "protection"
    );
    assert.equal(
      resolveClipboardCells("LS 16 A", clipboard)[0][0].kind,
      "text"
    );
  });

  it("drops unchanged values, blocks shared identifiers and rejects invalid numbers", () => {
    const unchanged = planCellWrites([
      {
        row: rowByKey("circuitCompact:circuit-1"),
        cellKey: "powerPerUnit",
        value: { kind: "text", text: "0,25" },
      },
    ]);
    assert.deepEqual(unchanged, {
      updates: [],
      changedCellCount: 0,
      skippedCellCount: 0,
    });
    const identifiers = planCellWrites(
      [
        {
          row: rowByKey("circuitCompact:circuit-2"),
          cellKey: "equipmentIdentifier",
          value: { kind: "text", text: "-2F9" },
        },
      ],
      { allowEquipmentIdentifier: false }
    );
    assert.equal(identifiers.skippedCellCount, 1);
    assert.equal(identifiers.updates.length, 0);
    assert.throws(
      () =>
        planCellWrites([
          {
            row: rowByKey("circuitCompact:circuit-1"),
            cellKey: "powerPerUnit",
            value: { kind: "text", text: "1.5" },
          },
        ]),
      /Komma/
    );
  });
});