import { mkdirSync, mkdtempSync, writeFileSync } from "node:fs";
import { tmpdir } from "node:os";
import { dirname, join, resolve } from "node:path";
import { fileURLToPath } from "node:url";
import { afterEach, describe, expect, it } from "vitest";

import {
  clearArtifactSchemaCacheForTests,
  loadSchema,
  validateArtifact,
} from "./artifact-schema.js";
import { DevflowError } from "./errors.js";

const artifactRoot = resolve(
  dirname(fileURLToPath(import.meta.url)),
  "../../../docs/schemas/artifacts",
);
const repoRoot = resolve(artifactRoot, "../../..");
const hash64 = "a".repeat(64);
const runId = "00000000-0000-4000-8000-000000000001";
const originalCwd = process.cwd();

describe("artifact schema registry", () => {
  afterEach(() => {
    process.chdir(originalCwd);
    clearArtifactSchemaCacheForTests();
  });

  it("loads the first locked artifact schemas from docs/schemas/artifacts", () => {
    clearArtifactSchemaCacheForTests();

    expect(loadSchema("dev/spec@1", { root: artifactRoot })).toMatchObject({
      $id: "dev/spec@1",
    });
    expect(loadSchema("dev/phase-plan@1", { root: artifactRoot })).toMatchObject({
      $id: "dev/phase-plan@1",
    });
    expect(loadSchema("common/final-report@1", { root: artifactRoot })).toMatchObject({
      $id: "common/final-report@1",
    });
    expect(Object.isFrozen(loadSchema("dev/spec@1", { root: artifactRoot }))).toBe(true);
  });

  it("finds the default schema root from package subdirectories", () => {
    process.chdir(resolve(repoRoot, "packages/core"));

    expect(loadSchema("dev/spec@1")).toMatchObject({ $id: "dev/spec@1" });
  });

  it("validates dev/spec@1 artifacts and returns compact validation errors", () => {
    expect(
      validateArtifact(
        "dev/spec@1",
        {
          summary: "Add a binding algorithm",
          requirements: [{ id: "REQ-1", description: "Bind every role" }],
          acceptanceCriteria: ["All roles have bindings"],
          risks: [],
        },
        { root: artifactRoot },
      ),
    ).toEqual({ ok: true });

    const result = validateArtifact(
      "dev/spec@1",
      {
        summary: "Missing requirements",
        requirements: [],
        acceptanceCriteria: [],
        risks: [],
      },
      { root: artifactRoot },
    );

    expect(result.ok).toBe(false);
    if (!result.ok) {
      expect(result.errors.map((error) => error.keyword)).toContain("minItems");
      expect(result.errors[0]).toMatchObject({
        instancePath: expect.any(String),
        schemaPath: expect.any(String),
        params: expect.any(Object),
      });
    }
  });

  it("validates dev/phase-plan@1 artifacts", () => {
    expect(
      validateArtifact(
        "dev/phase-plan@1",
        {
          phases: [
            {
              key: "implement",
              title: "Implement",
              objective: "Implement the requested behavior",
              roles: ["implementer"],
              expectedArtifact: {
                path: "artifacts/spec.json",
                schema: "dev/spec@1",
              },
              tasks: [
                {
                  id: "task-1",
                  title: "Edit code",
                  role: "implementer",
                  writeSet: ["packages/core/src/**", "**/*.ts"],
                },
              ],
            },
          ],
        },
        { root: artifactRoot },
      ),
    ).toEqual({ ok: true });

    const invalidSchemaId = validateArtifact(
      "dev/phase-plan@1",
      {
        phases: [
          {
            key: "implement",
            title: "Implement",
            objective: "Implement the requested behavior",
            roles: ["implementer"],
            expectedArtifact: {
              path: "artifacts/spec.json",
              schema: "../secret@1",
            },
          },
        ],
      },
      { root: artifactRoot },
    );

    expect(invalidSchemaId.ok).toBe(false);
    if (!invalidSchemaId.ok) {
      expect(invalidSchemaId.errors.map((error) => error.keyword)).toContain("pattern");
    }

    for (const path of [
      "../../secrets.json",
      "/etc/passwd",
      "artifacts/../outside.json",
      "C:/outside.json",
      "ok\n/../../outside.json",
      "ok\r/../../outside.json",
    ]) {
      const invalidPath = validateArtifact(
        "dev/phase-plan@1",
        {
          phases: [
            {
              key: "implement",
              title: "Implement",
              objective: "Implement the requested behavior",
              roles: ["implementer"],
              expectedArtifact: {
                path,
                schema: "dev/spec@1",
              },
            },
          ],
        },
        { root: artifactRoot },
      );

      expect(invalidPath.ok).toBe(false);
      if (!invalidPath.ok) {
        expect(invalidPath.errors.map((error) => error.keyword)).toContain("pattern");
      }
    }

    const missingWriteSet = validateArtifact(
      "dev/phase-plan@1",
      {
        phases: [
          {
            key: "implement",
            title: "Implement",
            objective: "Implement the requested behavior",
            roles: ["implementer"],
            tasks: [
              {
                id: "task-1",
                title: "Edit code",
                role: "implementer",
              },
            ],
          },
        ],
      },
      { root: artifactRoot },
    );

    expect(missingWriteSet.ok).toBe(false);
    if (!missingWriteSet.ok) {
      expect(missingWriteSet.errors.map((error) => error.keyword)).toContain("required");
    }

    for (const writeSet of [
      "../../**",
      "/etc/**",
      "src/../secrets/**",
      "C:/outside/**",
      "src\n/../../outside",
      "src\r/../../outside",
      "..\\outside\\**",
      "!/etc/**",
      "!../*",
      "{../*,packages/core/src/**}",
      "{..,packages}/**",
      "@(../*)",
      "!(../*)",
      "src/[ab]/**",
    ]) {
      const invalidWriteSet = validateArtifact(
        "dev/phase-plan@1",
        {
          phases: [
            {
              key: "implement",
              title: "Implement",
              objective: "Implement the requested behavior",
              roles: ["implementer"],
              tasks: [
                {
                  id: "task-1",
                  title: "Edit code",
                  role: "implementer",
                  writeSet: [writeSet],
                },
              ],
            },
          ],
        },
        { root: artifactRoot },
      );

      expect(invalidWriteSet.ok).toBe(false);
      if (!invalidWriteSet.ok) {
        expect(invalidWriteSet.errors.map((error) => error.keyword)).toContain("pattern");
      }
    }
  });

  it("validates common/final-report@1 minimum fields", () => {
    expect(
      validateArtifact(
        "common/final-report@1",
        {
          runId,
          templateHash: hash64,
          bindings: [{ roleId: "implementer", personaHash: hash64, backend: "fake" }],
          inputs: {},
          phases: [],
          approvals: [],
          findings: [],
          commands: [{ kind: "test", argv: ["pnpm", "test"], exit_code: 0 }],
          artifacts: [],
          events: { tail: [] },
          unresolved: [],
          endedAt: "2026-05-09T00:00:00.000Z",
          status: "completed",
        },
        { root: artifactRoot },
      ),
    ).toEqual({ ok: true });

    const result = validateArtifact(
      "common/final-report@1",
      {
        runId: "not-a-uuid",
        templateHash: hash64,
        bindings: [{ roleId: "implementer", personaHash: hash64, backend: "fake" }],
        inputs: {},
        phases: [],
        approvals: [],
        findings: [],
        commands: [],
        artifacts: [],
        events: { tail: [] },
        unresolved: [],
        endedAt: "2026-99-99T99:99:99Z",
        status: "executing",
      },
      { root: artifactRoot },
    );

    expect(result.ok).toBe(false);
    if (!result.ok) {
      expect(result.errors.map((error) => error.keyword)).toEqual(
        expect.arrayContaining(["format", "enum"]),
      );
    }
  });

  it("fails fatally for unknown or malformed schema ids", () => {
    expect(() => loadSchema("dev/unknown@1", { root: artifactRoot })).toThrow(DevflowError);
    expect(() => loadSchema("../secret@1", { root: artifactRoot })).toThrow(
      /artifact_schema_unknown/,
    );
  });

  it("fails fatally when schema files are malformed", () => {
    const root = mkdtempSync(join(tmpdir(), "devflow-artifact-schemas-"));
    const devDir = join(root, "dev");
    mkdirSync(devDir, { recursive: true });
    writeFileSync(
      join(devDir, "bad@1.json"),
      JSON.stringify({
        $schema: "https://json-schema.org/draft/2020-12/schema",
        $id: "dev/wrong@1",
        type: "object",
      }),
    );

    expect(() => loadSchema("dev/bad@1", { root })).toThrow(/artifact_schema_load_failed/);
  });

  it("wraps registry root, JSON parse, and path layout load failures", () => {
    expect(() =>
      loadSchema("dev/spec@1", { root: join(tmpdir(), "missing-artifact-root") }),
    ).toThrow(/artifact_schema_load_failed/);

    const badJsonRoot = mkdtempSync(join(tmpdir(), "devflow-artifact-schemas-"));
    mkdirSync(join(badJsonRoot, "dev"), { recursive: true });
    writeFileSync(join(badJsonRoot, "dev", "bad@1.json"), "{");
    expect(() => loadSchema("dev/bad@1", { root: badJsonRoot })).toThrow(
      /artifact_schema_load_failed/,
    );

    const badPathRoot = mkdtempSync(join(tmpdir(), "devflow-artifact-schemas-"));
    mkdirSync(join(badPathRoot, "bad"), { recursive: true });
    writeFileSync(
      join(badPathRoot, "bad", "schema.json"),
      JSON.stringify({
        $schema: "https://json-schema.org/draft/2020-12/schema",
        $id: "bad/schema",
        type: "object",
      }),
    );
    expect(() => loadSchema("dev/missing@1", { root: badPathRoot })).toThrow(
      /artifact_schema_load_failed/,
    );
  });

  it("does not load schemas from a target-controlled cwd shadow root", () => {
    const shadowRoot = mkdtempSync(join(tmpdir(), "devflow-shadow-schemas-"));
    const shadowSchemaDir = join(shadowRoot, "docs", "schemas", "artifacts", "dev");
    mkdirSync(shadowSchemaDir, { recursive: true });
    writeFileSync(join(shadowRoot, "package.json"), JSON.stringify({ name: "devflow" }));
    writeFileSync(
      join(shadowSchemaDir, "spec@1.json"),
      JSON.stringify({
        $schema: "https://json-schema.org/draft/2020-12/schema",
        $id: "dev/spec@1",
        title: "SHADOW",
        type: "object",
      }),
    );

    process.chdir(shadowRoot);

    expect(loadSchema("dev/spec@1")).toMatchObject({ title: "Devflow Development Specification" });
  });
});