import { describe, expect, it, vi } from "vitest";
import type { ParsedScopeRow, ScopeImportResult } from "./scopeImportParser.js";

// parseScopeImport depends on parseSpreadsheet from "./excel.js", which does
// real file I/O.  We mock that module so the parser logic can be tested in
// isolation with plain in-memory data.
vi.mock("./excel.js", () => ({
  parseSpreadsheet: vi.fn(),
}));

import { parseScopeImport } from "./scopeImportParser.js";
import { parseSpreadsheet } from "./excel.js";

const mockSpreadsheet = parseSpreadsheet as ReturnType<typeof vi.fn>;

// ---------------------------------------------------------------------------
// Helpers
// ---------------------------------------------------------------------------

function makeFile(): File {
  return new File(["dummy"], "test.xlsx");
}

// ---------------------------------------------------------------------------
// Empty / degenerate input
// ---------------------------------------------------------------------------

describe("parseScopeImport – empty input", () => {
  it("returns a warning and no rows when the spreadsheet is empty", async () => {
    mockSpreadsheet.mockResolvedValueOnce([]);

    const result: ScopeImportResult = await parseScopeImport(makeFile());

    expect(result.rows).toHaveLength(0);
    expect(result.warnings).toContain("File contains no data rows.");
    expect(result.mapping.name).toBeNull();
  });

  it("returns a warning when no name column can be identified", async () => {
    mockSpreadsheet.mockResolvedValueOnce([{ quantity: "3", budget: "1000" }]);

    const result = await parseScopeImport(makeFile());

    expect(result.rows).toHaveLength(0);
    expect(result.warnings.some((w) => w.includes('"Name" column'))).toBe(true);
  });

  it("returns a warning when name column is present but all values are empty", async () => {
    mockSpreadsheet.mockResolvedValueOnce([{ name: "   " }, { name: "" }]);

    const result = await parseScopeImport(makeFile());

    expect(result.rows).toHaveLength(0);
    expect(result.warnings).toContain("No rows with a non-empty name found.");
  });
});

// ---------------------------------------------------------------------------
// Column header resolution – aliases
// ---------------------------------------------------------------------------

describe("parseScopeImport – header alias resolution", () => {
  it("maps 'title' to the name field", async () => {
    mockSpreadsheet.mockResolvedValueOnce([{ title: "Shot A" }]);
    const result = await parseScopeImport(makeFile());
    expect(result.mapping.name).toBe("title");
    expect(result.rows[0]?.name).toBe("Shot A");
  });

  it("maps 'seq' to sequenceNo and uses its integer value", async () => {
    mockSpreadsheet.mockResolvedValueOnce([{ seq: "5", name: "Shot B" }]);
    const result = await parseScopeImport(makeFile());
    expect(result.mapping.sequenceNo).toBe("seq");
    expect(result.rows[0]?.sequenceNo).toBe(5);
  });

  it("maps 'type' to scopeType", async () => {
    mockSpreadsheet.mockResolvedValueOnce([{ type: "ASSET", name: "Prop01" }]);
    const result = await parseScopeImport(makeFile());
    expect(result.mapping.scopeType).toBe("type");
    expect(result.rows[0]?.scopeType).toBe("ASSET");
  });

  it("maps 'pkg' to packageCode", async () => {
    mockSpreadsheet.mockResolvedValueOnce([{ pkg: "PKG-01", name: "Shot C" }]);
    const result = await parseScopeImport(makeFile());
    expect(result.mapping.packageCode).toBe("pkg");
    expect(result.rows[0]?.packageCode).toBe("PKG-01");
  });

  it("maps 'desc' to description", async () => {
    mockSpreadsheet.mockResolvedValueOnce([{ desc: "Some details", name: "Shot D" }]);
    const result = await parseScopeImport(makeFile());
    expect(result.mapping.description).toBe("desc");
    expect(result.rows[0]?.description).toBe("Some details");
  });

  it("treats header matching as case-insensitive", async () => {
    mockSpreadsheet.mockResolvedValueOnce([{ NAME: "Shot E", TYPE: "VFX" }]);
    const result = await parseScopeImport(makeFile());
    expect(result.mapping.name).toBe("NAME");
    expect(result.mapping.scopeType).toBe("TYPE");
  });

  it("handles headers with mixed casing and spaces", async () => {
    mockSpreadsheet.mockResolvedValueOnce([{ "Sequence No": "10", Name: "Shot F" }]);
    const result = await parseScopeImport(makeFile());
    expect(result.mapping.sequenceNo).toBe("Sequence No");
    expect(result.rows[0]?.sequenceNo).toBe(10);
  });
});

// ---------------------------------------------------------------------------
// Sequence number handling
// ---------------------------------------------------------------------------

describe("parseScopeImport – sequence number auto-numbering", () => {
  it("auto-numbers rows when no sequenceNo column is present", async () => {
    mockSpreadsheet.mockResolvedValueOnce([
      { name: "Shot A" },
      { name: "Shot B" },
      { name: "Shot C" },
    ]);

    const result = await parseScopeImport(makeFile());

    expect(result.rows[0]?.sequenceNo).toBe(1);
    expect(result.rows[1]?.sequenceNo).toBe(2);
    expect(result.rows[2]?.sequenceNo).toBe(3);
    expect(result.warnings).toContain("No sequence number column detected — auto-numbering.");
  });

  it("falls back to auto-number when sequenceNo value is not a positive integer", async () => {
    mockSpreadsheet.mockResolvedValueOnce([
      { seq: "0", name: "Shot A" },
      { seq: "-5", name: "Shot B" },
      { seq: "abc", name: "Shot C" },
    ]);

    const result = await parseScopeImport(makeFile());

    result.rows.forEach((row, i) => {
      expect(row.sequenceNo).toBe(i + 1);
    });
  });

  it("respects explicit positive integer sequence numbers", async () => {
    mockSpreadsheet.mockResolvedValueOnce([
      { seq: "100", name: "Shot A" },
      { seq: "200", name: "Shot B" },
    ]);

    const result = await parseScopeImport(makeFile());

    expect(result.rows[0]?.sequenceNo).toBe(100);
    expect(result.rows[1]?.sequenceNo).toBe(200);
  });
});

// ---------------------------------------------------------------------------
// scopeType defaulting
// ---------------------------------------------------------------------------

describe("parseScopeImport – scopeType defaulting", () => {
  it("defaults scopeType to SHOT when no type column is present", async () => {
    mockSpreadsheet.mockResolvedValueOnce([{ name: "Shot A" }]);

    const result = await parseScopeImport(makeFile());

    expect(result.rows[0]?.scopeType).toBe("SHOT");
    expect(result.warnings).toContain("No scope type column detected — defaulting to SHOT.");
  });

  it("defaults scopeType to SHOT when the type cell is empty", async () => {
    mockSpreadsheet.mockResolvedValueOnce([{ type: "   ", name: "Shot A" }]);

    const result = await parseScopeImport(makeFile());

    expect(result.rows[0]?.scopeType).toBe("SHOT");
  });

  it("preserves the provided scopeType when it is non-empty", async () => {
    mockSpreadsheet.mockResolvedValueOnce([{ type: "ASSET", name: "Prop01" }]);

    const result = await parseScopeImport(makeFile());

    expect(result.rows[0]?.scopeType).toBe("ASSET");
  });
});

// ---------------------------------------------------------------------------
// Rows with empty names are skipped
// ---------------------------------------------------------------------------

describe("parseScopeImport – skipping empty-name rows", () => {
  it("skips rows where the name cell is blank", async () => {
    mockSpreadsheet.mockResolvedValueOnce([
      { name: "Shot A" },
      { name: "" },
      { name: "Shot C" },
      { name: "   " },
    ]);

    const result = await parseScopeImport(makeFile());

    expect(result.rows).toHaveLength(2);
    expect(result.rows[0]?.name).toBe("Shot A");
    expect(result.rows[1]?.name).toBe("Shot C");
  });
});

// ---------------------------------------------------------------------------
// Full happy-path scenario
// ---------------------------------------------------------------------------

describe("parseScopeImport – full integration scenario", () => {
  it("parses a complete row with all columns present", async () => {
    mockSpreadsheet.mockResolvedValueOnce([
      {
        number: "42",
        type: "VFX",
        code: "PKG-VFX",
        title: "Explosion",
        notes: "Big boom",
      },
    ]);

    const result = await parseScopeImport(makeFile());

    expect(result.warnings).toHaveLength(0);
    expect(result.rows).toHaveLength(1);

    const row: ParsedScopeRow = result.rows[0]!;
    expect(row.sequenceNo).toBe(42);
    expect(row.scopeType).toBe("VFX");
    expect(row.packageCode).toBe("PKG-VFX");
    expect(row.name).toBe("Explosion");
    expect(row.description).toBe("Big boom");
  });

  it("trims whitespace from all string fields", async () => {
    mockSpreadsheet.mockResolvedValueOnce([
      {
        name: "  Trimmed Name  ",
        type: "  SHOT  ",
        code: "  PKG-01  ",
        desc: "  Some notes  ",
      },
    ]);

    const result = await parseScopeImport(makeFile());
    const row = result.rows[0]!;

    expect(row.name).toBe("Trimmed Name");
    expect(row.scopeType).toBe("SHOT");
    expect(row.packageCode).toBe("PKG-01");
    expect(row.description).toBe("Some notes");
  });

  it("returns the correct mapping alongside the rows", async () => {
    mockSpreadsheet.mockResolvedValueOnce([
      { seq: "1", type: "VFX", package: "P1", name: "Shot A", description: "desc" },
    ]);

    const result = await parseScopeImport(makeFile());

    expect(result.mapping).toMatchObject({
      sequenceNo: "seq",
      scopeType: "type",
      packageCode: "package",
      name: "name",
      description: "description",
    });
  });
});