import { describe, expect, it } from "bun:test";

import {
  streamPromptResponse,
  type PermissionRequestPayload,
} from "../../src/routes/chatStream.js";
import { type OpencodeRuntimeAdapter } from "../../src/runtime/opencode.js";

const createEventStream = (events: unknown[]) => ({
  async *[Symbol.asyncIterator]() {
    for (const event of events) {
      yield event;
    }
  },
});

describe("streamPromptResponse", () => {
  it("forwards opencode permission requests as SSE payloads", async () => {
    const runtime = {
      subscribeEvents: async () =>
        createEventStream([
          {
            type: "permission.asked",
            properties: {
              id: "perm-1",
              sessionID: "runtime-session-1",
              permission: "bash",
              patterns: ["rm *"],
              metadata: { command: "rm tmp.txt" },
              always: ["rm *"],
            },
          },
          {
            type: "session.idle",
            properties: {
              sessionID: "runtime-session-1",
            },
          },
        ]),
      prompt: async () => undefined,
      messages: async () => [],
    } as unknown as OpencodeRuntimeAdapter;
    const events: Array<{ event: string; data: Record<string, unknown> }> = [];

    await streamPromptResponse({
      runtime,
      sessionId: "runtime-session-1",
      clientSessionId: "client-session-1",
      message: "delete temp",
      write: (event, data) => events.push({ event, data }),
    });

    const permissionEvent = events.find((item) => item.event === "permission_request");
    expect(permissionEvent?.data).toMatchObject({
      session_id: "client-session-1",
      request_id: "perm-1",
      permission: "bash",
      patterns: ["rm *"],
      metadata: { command: "rm tmp.txt" },
      always: ["rm *"],
    } satisfies Partial<PermissionRequestPayload>);
  });

  it("auto replies always when approval mode is always", async () => {
    const replies: Array<Record<string, unknown>> = [];
    const runtime = {
      subscribeEvents: async () =>
        createEventStream([
          {
            type: "permission.asked",
            properties: {
              id: "perm-1",
              sessionID: "runtime-session-1",
              permission: "bash",
              patterns: ["npm test"],
              metadata: { command: "npm test" },
              always: ["npm test"],
            },
          },
          {
            type: "session.idle",
            properties: {
              sessionID: "runtime-session-1",
            },
          },
        ]),
      prompt: async () => undefined,
      messages: async () => [],
      replyPermission: async (options: Record<string, unknown>) => {
        replies.push(options);
      },
    } as unknown as OpencodeRuntimeAdapter;
    const events: Array<{ event: string; data: Record<string, unknown> }> = [];

    await streamPromptResponse({
      runtime,
      sessionId: "runtime-session-1",
      clientSessionId: "client-session-1",
      message: "run tests",
      approvalMode: "always",
      write: (event, data) => events.push({ event, data }),
    });

    expect(replies).toEqual([
      {
        requestId: "perm-1",
        sessionId: "runtime-session-1",
        reply: "always",
      },
    ]);
    expect(events.some((item) => item.event === "permission_request")).toBe(false);
    expect(events.find((item) => item.event === "permission_response")?.data).toEqual({
      session_id: "client-session-1",
      request_id: "perm-1",
      reply: "always",
    });
  });

  it("forwards opencode v2 permission requests as SSE payloads", async () => {
    const runtime = {
      subscribeEvents: async () =>
        createEventStream([
          {
            type: "permission.v2.asked",
            properties: {
              id: "perm-v2-1",
              sessionID: "runtime-session-1",
              action: "external_directory",
              resources: ["/tmp"],
              save: ["/tmp"],
              metadata: { path: "/tmp" },
            },
          },
          {
            type: "session.idle",
            properties: {
              sessionID: "runtime-session-1",
            },
          },
        ]),
      prompt: async () => undefined,
      messages: async () => [],
    } as unknown as OpencodeRuntimeAdapter;
    const events: Array<{ event: string; data: Record<string, unknown> }> = [];

    await streamPromptResponse({
      runtime,
      sessionId: "runtime-session-1",
      clientSessionId: "client-session-1",
      message: "read /tmp",
      write: (event, data) => events.push({ event, data }),
    });

    const permissionEvent = events.find((item) => item.event === "permission_request");
    expect(permissionEvent?.data).toMatchObject({
      session_id: "client-session-1",
      request_id: "perm-v2-1",
      permission: "external_directory",
      patterns: ["/tmp"],
      metadata: { path: "/tmp" },
      always: ["/tmp"],
    } satisfies Partial<PermissionRequestPayload>);
  });
});