import { expect, test, vi } from "vitest";
import { mkdirSync, mkdtempSync, rmSync, writeFileSync } from "node:fs";
import { tmpdir } from "node:os";
import { join } from "node:path";
import { loadPiEnabledModels } from "../src/pi/enabled-models.js";

function fixture(globalValue: unknown, projectValue?: unknown) {
  const root = mkdtempSync(join(tmpdir(), "tht-enabled-models-"));
  const agentDir = join(root, "agent");
  const harnessDir = join(root, "harness");
  mkdirSync(agentDir, { recursive: true });
  mkdirSync(join(harnessDir, ".pi"), { recursive: true });
  writeFileSync(join(agentDir, "settings.json"), JSON.stringify(globalValue));
  if (projectValue !== undefined) {
    writeFileSync(join(harnessDir, ".pi", "settings.json"), JSON.stringify(projectValue));
  }
  return { root, agentDir, harnessDir };
}

test("loads exact global enabledModels in configured order", () => {
  const f = fixture({ enabledModels: [
    "zai/glm-5.2",
    "deepseek/deepseek-v4-flash",
    "local-qwen/qwen3.6-35b-a3b",
  ] });
  try {
    expect(loadPiEnabledModels(f)).toMatchObject({
      ids: [
        "zai/glm-5.2",
        "deepseek/deepseek-v4-flash",
        "local-qwen/qwen3.6-35b-a3b",
      ],
      warnings: [],
    });
  } finally { rmSync(f.root, { recursive: true, force: true }); }
});

test("uses the configured Pi agent directory when no explicit directory is passed", () => {
  const f = fixture({ enabledModels: ["zai/glm-5.2"] });
  vi.stubEnv("PI_CODING_AGENT_DIR", f.agentDir);
  try {
    expect(loadPiEnabledModels({ harnessDir: f.harnessDir })).toMatchObject({
      ids: ["zai/glm-5.2"],
      warnings: [],
    });
  } finally {
    vi.unstubAllEnvs();
    rmSync(f.root, { recursive: true, force: true });
  }
});

test("project enabledModels overrides global enabledModels", () => {
  const f = fixture(
    { enabledModels: ["zai/glm-5.2", "zai/glm-5v-turbo"] },
    { enabledModels: ["local-qwen/qwen3.6-35b-a3b"] },
  );
  try {
    expect(loadPiEnabledModels(f).ids).toEqual(["local-qwen/qwen3.6-35b-a3b"]);
  } finally { rmSync(f.root, { recursive: true, force: true }); }
});

test("project settings without enabledModels fall back to global settings", () => {
  const f = fixture({ enabledModels: ["zai/glm-5.2"] }, { theme: "thothii-mono" });
  try {
    expect(loadPiEnabledModels(f).ids).toEqual(["zai/glm-5.2"]);
  } finally { rmSync(f.root, { recursive: true, force: true }); }
});

test("invalid entries are ignored, deduplicated, and reported without their content", () => {
  const f = fixture({ enabledModels: [
    "zai/glm-5.2", "zai/glm-5.2", "glm-5.2", "zai/*", "zai/glm-5.2:high", 7,
  ] });
  try {
    const result = loadPiEnabledModels(f);
    expect(result.ids).toEqual(["zai/glm-5.2"]);
    expect(result.warnings).toHaveLength(4);
    expect(result.warnings.join(" ")).not.toContain("glm-5.2:high");
  } finally { rmSync(f.root, { recursive: true, force: true }); }
});

test.each([
  ["missing field", {}],
  ["empty field", { enabledModels: [] }],
  ["wrong type", { enabledModels: "zai/glm-5.2" }],
])("%s fails closed", (_name, settings) => {
  const f = fixture(settings);
  try {
    const result = loadPiEnabledModels(f);
    expect(result.ids).toEqual([]);
    expect(result.warnings.length).toBeGreaterThan(0);
  } finally { rmSync(f.root, { recursive: true, force: true }); }
});

test("malformed project settings fail closed instead of exposing global models", () => {
  const f = fixture({ enabledModels: ["zai/glm-5.2"] });
  writeFileSync(join(f.harnessDir, ".pi", "settings.json"), "{");
  try {
    const result = loadPiEnabledModels(f);
    expect(result.ids).toEqual([]);
    expect(result.warnings).toHaveLength(1);
  } finally { rmSync(f.root, { recursive: true, force: true }); }
});

test("missing global settings fail closed", () => {
  const f = fixture({ enabledModels: ["zai/glm-5.2"] });
  rmSync(join(f.agentDir, "settings.json"));
  try {
    const result = loadPiEnabledModels(f);
    expect(result.ids).toEqual([]);
    expect(result.warnings).toHaveLength(1);
  } finally { rmSync(f.root, { recursive: true, force: true }); }
});