import { mkdir, symlink, writeFile } from "node:fs/promises";
import { join } from "node:path";
import { expect } from "vitest";
import { toolContract } from "../../src/contracts/toolContracts.js";
import {
  marshalCode,
  pythonPycFixture,
  pythonPycHeader,
} from "../../src/python/PythonPyc.fixture.js";
import { createTestTempDirectory } from "../fixtures/temporaryDirectory.js";
import { cliTest } from "../support/cli/cliFixture.js";

cliTest(
  "reports nested CPython code objects through the public CLI",
  async ({ cli }) => {
    const root = await createTestTempDirectory("rea-python-pyc-cli-");
    const path = join(root, "sample.pyc");
    await writeFile(path, pythonPycFixture("py311", { nested: true }));
    const result = await cli.run({
      arguments: ["inspect-python-pyc", path, "--json"],
    });
    expect(result.exitCode, result.stderr).toBe(0);
    const evidence = toolContract("inspect_python_pyc").outputSchema.parse(
      result.json,
    );
    expect(evidence.normalized_result.header.python_version).toBe("3.12");
    expect(evidence.normalized_result.code_objects[1]?.name).toBe("inner");
  },
);

cliTest(
  "classifies unsupported 3.7 alpha headers without labeling their marshal data malformed",
  async ({ cli }) => {
    const root = await createTestTempDirectory("rea-python-pyc-alpha-header-");
    const marshal = Buffer.from(
      "e3000000000000000000000000010000004000000073040000006400530029014ea900720100000072010000007201000000fa066d6f642e7079da083c6d6f64756c653e010000007300000000",
      "hex",
    );
    expect(marshal).toHaveLength(77);
    for (const magic of [3390, 3391]) {
      const path = join(root, `${magic}.pyc`);
      const header = Buffer.alloc(12);
      header.writeUInt16LE(magic);
      header[2] = 0x0d;
      header[3] = 0x0a;
      await writeFile(path, Buffer.concat([header, marshal]));
      const result = await cli.run({
        arguments: ["inspect-python-pyc", path, "--json"],
      });
      expect(result.exitCode).toBe(1);
      expect(result.json).toMatchObject({
        code: "unsupported_target",
        category: "unsupported_target",
      });
      expect(JSON.stringify(result.json)).toContain(
        "unsupported 12-byte CPython header",
      );
      expect(result.json).not.toHaveProperty("normalized_result");
    }

    for (const magic of [3392, 3394]) {
      const path = join(root, `${magic}.pyc`);
      await writeFile(path, Buffer.concat([pythonPycHeader(magic), marshal]));
      const result = await cli.run({
        arguments: ["inspect-python-pyc", path, "--json"],
      });
      expect(result.exitCode, result.stderr).toBe(0);
      const evidence = toolContract("inspect_python_pyc").outputSchema.parse(
        result.json,
      );
      expect(evidence.normalized_result.header.magic).toBe(magic);
      expect(evidence.normalized_result.code_objects[0]?.bytecode.bytes).toBe(
        4,
      );
    }
  },
);

cliTest(
  "rejects constructor-invalid signed code flags and preserves unknown positive flags",
  async ({ cli }) => {
    const root = await createTestTempDirectory("rea-python-pyc-flags-");
    for (const { name, magic, layout, flags, expected, valid } of [
      {
        name: "zero",
        magic: 3531,
        layout: "py311",
        flags: 0,
        expected: 0,
        valid: true,
      },
      {
        name: "unknown-positive",
        magic: 3531,
        layout: "py311",
        flags: 0x40000000,
        expected: 0x40000000,
        valid: true,
      },
      {
        name: "negative-py311",
        magic: 3531,
        layout: "py311",
        flags: 0x80000000,
        expected: -0x80000000,
        valid: false,
      },
      {
        name: "negative-plus-one-py311",
        magic: 3531,
        layout: "py311",
        flags: 0x80000001,
        expected: -0x7fffffff,
        valid: false,
      },
      {
        name: "negative-py37",
        magic: 3394,
        layout: "py37",
        flags: 0x80000000,
        expected: -0x80000000,
        valid: true,
      },
    ] as const) {
      const path = join(root, `${name}.pyc`);
      await writeFile(
        path,
        Buffer.concat([pythonPycHeader(magic), marshalCode(layout, { flags })]),
      );
      const result = await cli.run({
        arguments: ["inspect-python-pyc", path, "--json"],
      });
      if (valid) {
        expect(result.exitCode, result.stderr).toBe(0);
        const evidence = toolContract("inspect_python_pyc").outputSchema.parse(
          result.json,
        );
        expect(evidence.normalized_result.code_objects[0]?.flags).toBe(
          expected,
        );
      } else {
        expect(result.exitCode).toBe(1);
        expect(result.json).toMatchObject({
          code: "invalid_request",
          category: "invalid_input",
          details: {
            operation: "inspect_python_pyc",
            issues: [
              {
                reason: "invalid_format",
                message: expect.stringContaining("co_flags is negative"),
              },
            ],
          },
        });
        expect(result.json).not.toHaveProperty("normalized_result");
      }
    }
  },
);

cliTest(
  "preserves negative CPython first line numbers through the public CLI",
  async ({ cli }) => {
    const root = await createTestTempDirectory("rea-python-pyc-lines-");
    const path = join(root, "sample.pyc");
    const nested = marshalCode("py311", {
      name: "inner",
      firstlineno: -7,
    });
    const bytes = Buffer.concat([
      pythonPycHeader(3531),
      marshalCode("py311", {
        firstlineno: -1,
        consts: [nested],
      }),
    ]);
    await writeFile(path, bytes);
    const result = await cli.run({
      arguments: ["inspect-python-pyc", path, "--json"],
    });
    expect(result.exitCode, result.stderr).toBe(0);
    const evidence = toolContract("inspect_python_pyc").outputSchema.parse(
      result.json,
    );
    expect(evidence.normalized_result.code_objects[0]?.firstlineno).toBe(-1);
    expect(evidence.normalized_result.code_objects[0]?.consts).toContainEqual({
      kind: "code",
      name: "inner",
      firstlineno: -7,
    });
  },
);

cliTest(
  "matches CPython reference slots for singleton and reference tags",
  async ({ cli }) => {
    const root = await createTestTempDirectory("rea-python-pyc-ref-slots-");
    const cases = [
      {
        name: "flagged-none",
        consts: "2903cefa01787200000000",
        expected: [
          { kind: "none" },
          { kind: "str", value: "x" },
          { kind: "str", value: "x" },
        ],
      },
      {
        name: "flagged-ref",
        consts: "2904fa0161f200000000fa01627201000000",
        expected: [
          { kind: "str", value: "a" },
          { kind: "str", value: "a" },
          { kind: "str", value: "b" },
          { kind: "str", value: "b" },
        ],
      },
    ];
    for (const testCase of cases) {
      const path = join(root, `${testCase.name}.pyc`);
      await writeFile(
        path,
        Buffer.concat([
          pythonPycHeader(3531),
          marshalCode("py311", {
            constsObject: Buffer.from(testCase.consts, "hex"),
          }),
        ]),
      );
      const result = await cli.run({
        arguments: ["inspect-python-pyc", path, "--json"],
      });
      expect(result.exitCode, result.stderr).toBe(0);
      const evidence = toolContract("inspect_python_pyc").outputSchema.parse(
        result.json,
      );
      expect(evidence.normalized_result.code_objects[0]?.consts).toMatchObject(
        testCase.expected,
      );
    }
  },
);

cliTest(
  "counts code keys using the selected CPython equality rules",
  async ({ cli }) => {
    const root = await createTestTempDirectory("rea-python-pyc-equality-");
    const cases = [
      { magic: 3413, layout: "py38" as const, lengths: [1, 1] },
      { magic: 3439, layout: "py38" as const, lengths: [1, 1] },
      { magic: 3531, layout: "py311" as const, lengths: [2, 2] },
    ];
    for (const [index, testCase] of cases.entries()) {
      const code = (linetable: Buffer) =>
        marshalCode(testCase.layout, {
          name: "f",
          filename: "fixture.py",
          firstlineno: 1,
          linetable,
        });
      const frozenSet = Buffer.concat([
        Buffer.from([0x3e]),
        Buffer.from([2, 0, 0, 0]),
        code(Buffer.from([2, 1])),
        code(Buffer.from([2, 2])),
      ]);
      const dict = Buffer.concat([
        Buffer.from([0x7b]),
        code(Buffer.from([2, 1])),
        Buffer.from([0x4e]),
        code(Buffer.from([2, 2])),
        Buffer.from([0x54, 0x30]),
      ]);
      const path = join(root, `case-${index}.pyc`);
      await writeFile(
        path,
        Buffer.concat([
          pythonPycHeader(testCase.magic),
          marshalCode(testCase.layout, { consts: [frozenSet, dict] }),
        ]),
      );
      const result = await cli.run({
        arguments: ["inspect-python-pyc", path, "--json"],
      });
      expect(result.exitCode, result.stderr).toBe(0);
      const evidence = toolContract("inspect_python_pyc").outputSchema.parse(
        result.json,
      );
      expect(
        evidence.normalized_result.code_objects[0]?.consts.map((value) =>
          value.kind === "frozenset" || value.kind === "dict"
            ? value.length
            : null,
        ),
      ).toEqual(testCase.lengths);
    }
  },
);

cliTest(
  "uses constructor-normalized legacy flags for code keys and preserves raw flags",
  async ({ cli }) => {
    const root = await createTestTempDirectory(
      "rea-python-pyc-effective-flags-",
    );
    const cases = [
      {
        name: "py37-empty-tables",
        magic: 3394,
        layout: "py37" as const,
        freevars: [],
        cellvars: [],
        lengths: [1, 1],
      },
      {
        name: "py310-nonempty-tables",
        magic: 3439,
        layout: "py38" as const,
        freevars: ["capture"],
        cellvars: [],
        lengths: [1, 1],
      },
      {
        name: "py311-raw-flags",
        magic: 3531,
        layout: "py311" as const,
        freevars: [],
        cellvars: [],
        lengths: [2, 2],
      },
    ];
    for (const testCase of cases) {
      const code = (flags: number) =>
        marshalCode(testCase.layout, {
          name: "f",
          filename: "fixture.py",
          firstlineno: 1,
          flags,
          freevars: testCase.freevars,
          cellvars: testCase.cellvars,
        });
      const first = code(0);
      const second = code(0x40);
      const frozenSet = Buffer.concat([
        Buffer.from([0x3e]),
        Buffer.from([2, 0, 0, 0]),
        first,
        second,
      ]);
      const dict = Buffer.concat([
        Buffer.from([0x7b]),
        first,
        Buffer.from([0x4e]),
        second,
        Buffer.from([0x54, 0x30]),
      ]);
      const path = join(root, `${testCase.name}.pyc`);
      await writeFile(
        path,
        Buffer.concat([
          pythonPycHeader(testCase.magic),
          marshalCode(testCase.layout, { consts: [frozenSet, dict] }),
        ]),
      );
      const result = await cli.run({
        arguments: ["inspect-python-pyc", path, "--json"],
      });
      expect(result.exitCode, result.stderr).toBe(0);
      const evidence = toolContract("inspect_python_pyc").outputSchema.parse(
        result.json,
      );
      expect(
        evidence.normalized_result.code_objects[0]?.consts.map((value) =>
          value.kind === "frozenset" || value.kind === "dict"
            ? value.length
            : null,
        ),
      ).toEqual(testCase.lengths);
      expect(
        evidence.normalized_result.code_objects
          .filter((object) => object.name === "f")
          .map((object) => object.flags),
      ).toContain(0);

      const rawPath = join(root, `raw-${testCase.name}.pyc`);
      await writeFile(
        rawPath,
        Buffer.concat([
          pythonPycHeader(testCase.magic),
          marshalCode(testCase.layout, {
            name: "f",
            flags: 0x40,
            freevars: testCase.freevars,
            cellvars: testCase.cellvars,
          }),
        ]),
      );
      const rawResult = await cli.run({
        arguments: ["inspect-python-pyc", rawPath, "--json"],
      });
      expect(rawResult.exitCode, rawResult.stderr).toBe(0);
      const rawEvidence = toolContract("inspect_python_pyc").outputSchema.parse(
        rawResult.json,
      );
      expect(rawEvidence.normalized_result.code_objects[0]?.flags).toBe(0x40);
    }
  },
);

cliTest(
  "resolves a relative pyc path against the working directory",
  async ({ cli }) => {
    const root = await createTestTempDirectory("rea-python-pyc-cli-rel-");
    await writeFile(join(root, "sample.pyc"), pythonPycFixture("py37"));
    const result = await cli.run({
      arguments: ["inspect-python-pyc", "sample.pyc", "--json"],
      cwd: root,
    });
    expect(result.exitCode, result.stderr).toBe(0);
    const evidence = toolContract("inspect_python_pyc").outputSchema.parse(
      result.json,
    );
    expect(evidence.normalized_result.header.python_version).toBe("3.7");
    expect(evidence.subject?.local_path).toBe(join(root, "sample.pyc"));
  },
);

cliTest.skipIf(process.platform === "win32")(
  "reads the file the symlink path names, not its lexical sibling",
  async ({ cli }) => {
    const root = await createTestTempDirectory("rea-python-pyc-cli-link-");
    const target = join(root, "target");
    await mkdir(join(target, "child"), { recursive: true });
    await writeFile(join(target, "sample.pyc"), pythonPycFixture("py37"));
    await writeFile(join(root, "sample.pyc"), pythonPycFixture("py311"));
    await symlink(join(target, "child"), join(root, "link"));
    const result = await cli.run({
      arguments: ["inspect-python-pyc", "link/../sample.pyc", "--json"],
      cwd: root,
    });
    expect(result.exitCode, result.stderr).toBe(0);
    const evidence = toolContract("inspect_python_pyc").outputSchema.parse(
      result.json,
    );
    expect(evidence.normalized_result.header.python_version).toBe("3.7");
    expect(evidence.subject?.local_path).toBe(`${root}/link/../sample.pyc`);
  },
);

cliTest("reports a truncated pyc as invalid input", async ({ cli }) => {
  const root = await createTestTempDirectory("rea-python-pyc-cli-bad-");
  const path = join(root, "broken.pyc");
  await writeFile(path, Buffer.from("not a pyc"));
  const result = await cli.run({
    arguments: ["inspect-python-pyc", path, "--json"],
  });
  expect(result.exitCode).toBe(1);
  expect(result.json).toMatchObject({
    code: "invalid_request",
    details: { operation: "inspect_python_pyc" },
  });
});