import { describe, it } from "vitest";
import fc from "fast-check";
import { CodexBackend } from "../../src/backends/codex-backend.js";
import type { BackendAdapterConfig } from "../../src/backends/types.js";

// Feature: multi-cli-backend, Property 2: Codex backend required flags
// **Validates: Requirements 3.2, 3.3, 3.4, 3.5**

/**
 * Arbitrary for non-empty strings that won't break CLI arg parsing.
 */
const nonEmptyString = fc.string({ minLength: 1, maxLength: 200 });

/**
 * Arbitrary for working directory paths (non-empty, path-like).
 */
const workingDir = fc.stringMatching(/^\/[A-Za-z0-9_/.-]{1,100}$/);

function createBackend(workDir: string): CodexBackend {
  const config: BackendAdapterConfig = {
    cliPath: "codex",
    workingDir: workDir,
    queryTimeoutMs: 60000,
    allowedTools: [],
    maxTurns: 25,
  };
  return new CodexBackend(config);
}

describe("Property 2: Codex backend required flags", () => {
  it("generated args always contain the exec subcommand", () => {
    fc.assert(
      fc.property(
        nonEmptyString,
        workingDir,
        (prompt, workDir) => {
          const backend = createBackend(workDir);
          const args = backend.buildArgs(prompt);

          return args[0] === "exec";
        },
      ),
      { numRuns: 100 },
    );
  });

  it("generated args always contain --json", () => {
    fc.assert(
      fc.property(
        nonEmptyString,
        workingDir,
        (prompt, workDir) => {
          const backend = createBackend(workDir);
          const args = backend.buildArgs(prompt);

          return args.includes("--json");
        },
      ),
      { numRuns: 100 },
    );
  });

  it("generated args always contain --dangerously-bypass-approvals-and-sandbox", () => {
    fc.assert(
      fc.property(
        nonEmptyString,
        workingDir,
        (prompt, workDir) => {
          const backend = createBackend(workDir);
          const args = backend.buildArgs(prompt);

          return args.includes("--dangerously-bypass-approvals-and-sandbox");
        },
      ),
      { numRuns: 100 },
    );
  });

  it("generated args always contain --cd with the configured working directory", () => {
    fc.assert(
      fc.property(
        nonEmptyString,
        workingDir,
        (prompt, workDir) => {
          const backend = createBackend(workDir);
          const args = backend.buildArgs(prompt);

          const cdIndex = args.indexOf("--cd");
          return cdIndex !== -1 && args[cdIndex + 1] === workDir;
        },
      ),
      { numRuns: 100 },
    );
  });
});