import { mkdirSync, mkdtempSync, realpathSync, symlinkSync, writeFileSync } from "node:fs";
import { tmpdir } from "node:os";
import { join } from "node:path";
import { describe, expect, it } from "vitest";

import { Persona } from "./persona.js";
import {
  assertNoReferencedRegistryDeletions,
  buildRegistrySeedPlan,
  loadPersonaFiles,
  loadTemplateFiles,
  personaHash,
  templateHash,
} from "./registry-loader.js";

function makeRoot() {
  return mkdtempSync(join(tmpdir(), "devflow-registry-"));
}

describe("registry loader", () => {
  it("loads versioned persona YAML files and computes stable hashes", () => {
    const root = makeRoot();
    const dir = join(root, "personas");
    mkdirSync(dir, { recursive: true });
    writeFileSync(
      join(dir, "fake_developer@1.yaml"),
      [
        "name: fake_developer",
        "version: 1",
        "backend: fake",
        "capabilities:",
        "  - code_edit",
        "maxRiskLevel: medium",
      ].join("\n"),
    );

    const [entry] = loadPersonaFiles(dir);

    expect(entry?.name).toBe("fake_developer");
    expect(entry?.version).toBe(1);
    expect(entry?.path).toBe(realpathSync(join(dir, "fake_developer@1.yaml")));
    expect(entry?.hash).toMatch(/^[a-f0-9]{64}$/);
    expect(entry?.hash).toBe(personaHash(entry?.definition));
  });

  it("rejects non-canonical template filenames and filename identity mismatches", () => {
    const root = makeRoot();
    const dir = join(root, "templates");
    mkdirSync(dir, { recursive: true });
    writeFileSync(
      join(dir, "development@1.yaml"),
      [
        "name: development",
        "version: 1",
        "roles:",
        "  - id: implementer",
        "    requiredCapabilities:",
        "      - code_edit",
        "phases:",
        "  - key: spec",
        "    title: Spec",
        "    risk: low",
        "    roles:",
        "      - implementer",
      ].join("\n"),
    );
    writeFileSync(
      join(dir, "development@01.yaml"),
      ["name: development", "version: 1", "roles: []", "phases: []"].join("\n"),
    );
    writeFileSync(
      join(dir, "actual_name@2.yml"),
      ["name: actual_name", "version: 2", "roles: []", "phases: []"].join("\n"),
    );

    expect(() => loadTemplateFiles(dir)).toThrow(/registry filename/);

    const validDir = join(root, "valid-templates");
    mkdirSync(validDir);
    writeFileSync(join(validDir, "development@1.yaml"), readDevelopmentTemplate());
    const [entry] = loadTemplateFiles(validDir);

    expect(entry?.hash).toBe(templateHash(entry?.definition));

    const mismatchDir = join(root, "mismatched-templates");
    mkdirSync(mismatchDir);
    writeFileSync(join(mismatchDir, "wrong@1.yaml"), readDevelopmentTemplate());

    expect(() => loadTemplateFiles(mismatchDir)).toThrow(/identity mismatch/);
  });

  it("rejects registry versions outside the database integer range", () => {
    const root = makeRoot();
    const personaDir = join(root, "personas");
    mkdirSync(personaDir);
    writeFileSync(
      join(personaDir, "fake@2147483648.yaml"),
      [
        "name: fake",
        "version: 2147483648",
        "backend: fake",
        "capabilities: []",
        "maxRiskLevel: low",
      ].join("\n"),
    );

    expect(() => loadPersonaFiles(personaDir)).toThrow(/less than or equal/);
  });

  it("rejects unknown template and persona keys instead of silently stripping them", () => {
    const root = makeRoot();
    const personaDir = join(root, "personas");
    const templateDir = join(root, "templates");
    mkdirSync(personaDir);
    mkdirSync(templateDir);
    writeFileSync(
      join(personaDir, "fake@1.yaml"),
      [
        "name: fake",
        "version: 1",
        "backend: fake",
        "capabilities: []",
        "maxRiskLevel: low",
        "typo: accepted",
      ].join("\n"),
    );
    writeFileSync(
      join(templateDir, "development@1.yaml"),
      ["name: development", "version: 1", "roles: []", "phases: []", "typo: accepted"].join("\n"),
    );

    expect(() => loadPersonaFiles(personaDir)).toThrow(/Unrecognized key/);
    expect(() => loadTemplateFiles(templateDir)).toThrow(/Unrecognized key/);
  });

  it("rejects persona model config values that cannot be content-hashed as JSON", () => {
    const root = makeRoot();
    const personaDir = join(root, "personas");
    mkdirSync(personaDir);
    writeFileSync(
      join(personaDir, "fake@1.yaml"),
      [
        "name: fake",
        "version: 1",
        "backend: fake",
        "capabilities: []",
        "maxRiskLevel: low",
        "modelConfig:",
        "  temperature: .nan",
      ].join("\n"),
    );

    expect(() => loadPersonaFiles(personaDir)).toThrow(/finite|number|expected plain JSON object/);
  });

  it("rejects persona model config keys that would mutate object prototypes", () => {
    const root = makeRoot();
    const personaDir = join(root, "personas");
    mkdirSync(personaDir);
    writeFileSync(
      join(personaDir, "fake@1.yaml"),
      [
        "name: fake",
        "version: 1",
        "backend: fake",
        "capabilities: []",
        "maxRiskLevel: low",
        "modelConfig:",
        '  "__proto__":',
        "    x: 1",
      ].join("\n"),
    );

    expect(() => loadPersonaFiles(personaDir)).toThrow(/reserved object key/);
  });

  it("rejects non-plain programmatic model config objects", () => {
    class ModelConfig {
      readonly inherited = true;
    }

    expect(() =>
      Persona.parse({
        name: "fake",
        version: 1,
        backend: "fake",
        capabilities: [],
        maxRiskLevel: "low",
        modelConfig: new ModelConfig(),
      }),
    ).toThrow(/expected plain JSON object/);
  });

  it("rejects programmatic model config arrays with non-index keys", () => {
    const array = [1] as unknown[] & { extra?: number };
    array.extra = 2;

    expect(() =>
      Persona.parse({
        name: "fake",
        version: 1,
        backend: "fake",
        capabilities: [],
        maxRiskLevel: "low",
        modelConfig: { array },
      }),
    ).toThrow(/expected JSON array/);
  });

  it("rejects symlinked registry files", () => {
    const root = makeRoot();
    const dir = join(root, "personas");
    mkdirSync(dir);
    const target = join(root, "target.yaml");
    writeFileSync(
      target,
      ["name: fake", "version: 1", "backend: fake", "capabilities: []", "maxRiskLevel: low"].join(
        "\n",
      ),
    );
    symlinkSync(target, join(dir, "fake@1.yaml"));

    expect(() => loadPersonaFiles(dir)).toThrow(/not a symlink/);
  });

  it("builds seed actions and fails on published hash mismatch", () => {
    const root = makeRoot();
    const personaDir = join(root, "personas");
    mkdirSync(personaDir);
    writeFileSync(
      join(personaDir, "fake@1.yaml"),
      ["name: fake", "version: 1", "backend: fake", "capabilities: []", "maxRiskLevel: low"].join(
        "\n",
      ),
    );
    const [entry] = loadPersonaFiles(personaDir);
    if (!entry) {
      throw new Error("expected persona registry entry");
    }

    expect(buildRegistrySeedPlan([entry], [])).toEqual({
      unchanged: [],
      inserts: [entry],
      missingReferenced: [],
      missingUnreferenced: [],
    });
    expect(() =>
      buildRegistrySeedPlan(
        [entry],
        [{ name: "fake", version: 1, hash: "different", referencedByRun: false }],
      ),
    ).toThrow(/published registry entry was modified/);
  });

  it("reports published registry rows that no longer have YAML files", () => {
    const plan = buildRegistrySeedPlan(
      [],
      [
        { name: "unused", version: 1, hash: "abc", referencedByRun: false },
        { name: "referenced", version: 1, hash: "def", referencedByRun: true },
      ],
    );

    expect(plan).toEqual({
      inserts: [],
      missingReferenced: [{ name: "referenced", version: 1, hash: "def", referencedByRun: true }],
      missingUnreferenced: [{ name: "unused", version: 1, hash: "abc", referencedByRun: false }],
      unchanged: [],
    });
  });

  it("rejects referenced published registry deletions", () => {
    const plan = buildRegistrySeedPlan(
      [],
      [{ name: "referenced", version: 1, hash: "def", referencedByRun: true }],
    );

    expect(() => assertNoReferencedRegistryDeletions("persona", plan)).toThrow(/referenced@1/);
  });
});

function readDevelopmentTemplate() {
  return [
    "name: development",
    "version: 1",
    "roles:",
    "  - id: implementer",
    "    requiredCapabilities:",
    "      - code_edit",
    "phases:",
    "  - key: spec",
    "    title: Spec",
    "    risk: low",
    "    roles:",
    "      - implementer",
  ].join("\n");
}