import { assertEquals, assertRejects } from "jsr:@std/assert@1";
import {
  collectOpenCodeOutput,
  openCodeArgs,
  parseOpenCodeEvents,
} from "./opencode.ts";

Deno.test("builds a non-interactive auto-approved OpenCode command", () => {
  assertEquals(
    openCodeArgs("openrouter/qwen/qwen3.8-27b", "Review this"),
    [
      "run",
      "--format",
      "json",
      "--auto",
      "--model",
      "openrouter/qwen/qwen3.8-27b",
      "Review this",
    ],
  );
});

Deno.test("returns the final visible OpenCode text event", () => {
  assertEquals(
    parseOpenCodeEvents([
      JSON.stringify({ type: "step_start", part: { type: "step-start" } }),
      JSON.stringify({ type: "text", part: { type: "text", text: "draft" } }),
      JSON.stringify({ type: "text", part: { type: "text", text: "done" } }),
      JSON.stringify({ type: "step_finish", part: { type: "step-finish" } }),
    ].join("\n")),
    "done",
  );
});

Deno.test("rejects a successful OpenCode run without visible text", async () => {
  await assertRejects(
    async () => {
      parseOpenCodeEvents('{"type":"step_start"}');
      await Promise.resolve();
    },
    Error,
    "no text output",
  );
});

Deno.test("streams OpenCode output while collecting it", async () => {
  const encode = (value: string) => new TextEncoder().encode(value);
  const stdout = new ReadableStream<Uint8Array>({
    start(controller) {
      controller.enqueue(encode("first\n"));
      controller.enqueue(encode("second\n"));
      controller.close();
    },
  });
  const stderr = new ReadableStream<Uint8Array>({
    start(controller) {
      controller.enqueue(encode("warning\n"));
      controller.close();
    },
  });
  const shown: string[] = [];

  const result = await collectOpenCodeOutput(
    stdout,
    stderr,
    (chunk: Uint8Array) => {
      shown.push(`out:${new TextDecoder().decode(chunk)}`);
    },
    (chunk: Uint8Array) => {
      shown.push(`err:${new TextDecoder().decode(chunk)}`);
    },
  );

  assertEquals(result, { stdout: "first\nsecond\n", stderr: "warning\n" });
  assertEquals(shown, ["out:first\n", "err:warning\n", "out:second\n"]);
});