import { describe, expect, it } from "bun:test";
import { type OpencodeClient } from "@opencode-ai/sdk/v2";
import { mkdtemp, readdir, rm, stat } from "node:fs/promises";
import { tmpdir } from "node:os";
import { join, relative } from "node:path";

import { config } from "../../src/config.js";
import { OpencodeRuntimeAdapter } from "../../src/runtime/opencode.js";

const createRuntimeAdapter = (
  messages: unknown[],
  calls: {
    reverted: string[];
    removed: string[];
  } = { reverted: [], removed: [] },
) =>
  Object.assign(Object.create(OpencodeRuntimeAdapter.prototype), {
    messages: async () => messages,
    revertMessage: async (_sessionId: string, messageId: string) => {
      calls.reverted.push(messageId);
    },
    removeMessage: async (_sessionId: string, messageId: string) => {
      calls.removed.push(messageId);
    },
  }) as OpencodeRuntimeAdapter;

describe("OpencodeRuntimeAdapter.revertToUserMessage", () => {
  it("skips reverting the first user message when the runtime session is empty", async () => {
    const calls = { reverted: [] as string[], removed: [] as string[] };
    const runtime = createRuntimeAdapter([], calls);

    await runtime.revertToUserMessage("session-1", { userOrdinal: 1 });

    expect(calls).toEqual({ reverted: [], removed: [] });
  });

  it("keeps ordinal mismatches visible when runtime messages exist", async () => {
    const runtime = createRuntimeAdapter([
      { info: { id: "user-1", role: "user" } },
      { info: { id: "assistant-1", role: "assistant" } },
    ]);

    await expect(
      runtime.revertToUserMessage("session-1", { userOrdinal: 2 }),
    ).rejects.toThrow("target user message not found to revert");
  });

  it("reverts and removes messages from the target user message onward", async () => {
    const calls = { reverted: [] as string[], removed: [] as string[] };
    const runtime = createRuntimeAdapter(
      [
        { info: { id: "user-1", role: "user" } },
        { info: { id: "assistant-1", role: "assistant" } },
        { info: { id: "user-2", role: "user" } },
        { info: { id: "assistant-2", role: "assistant" } },
      ],
      calls,
    );

    await runtime.revertToUserMessage("session-1", { userOrdinal: 2 });

    expect(calls).toEqual({
      reverted: ["user-2"],
      removed: ["assistant-2", "user-2"],
    });
  });
});

describe("OpencodeRuntimeAdapter.ensureClient", () => {
  it("retries bootstrap after a failed startup attempt", async () => {
    let attempts = 0;
    const client = {
      global: { health: async () => ({ data: { healthy: true } }) },
    } as unknown as OpencodeClient;
    const runtime = Object.assign(Object.create(OpencodeRuntimeAdapter.prototype), {
      clientPromise: null,
      closeServer: null,
      bootstrapClient: async () => {
        attempts += 1;
        if (attempts === 1) {
          throw new Error("startup failed");
        }
        return client;
      },
    }) as OpencodeRuntimeAdapter;

    await expect(runtime.ensureClient()).rejects.toThrow("startup failed");
    await expect(runtime.ensureClient()).resolves.toBe(client);
    expect(attempts).toBe(2);
  });
});

describe("OpencodeRuntimeAdapter.subscribeEvents", () => {
  it("subscribes to the conversation workspace directory", async () => {
    const calls: Array<Record<string, unknown> | undefined> = [];
    const stream = (async function* () {
      return;
    })();
    const client = {
      event: {
        subscribe: async (input?: Record<string, unknown>) => {
          calls.push(input);
          return { stream };
        },
      },
    } as unknown as OpencodeClient;
    const runtime = Object.assign(Object.create(OpencodeRuntimeAdapter.prototype), {
      ensureClient: async () => client,
    }) as OpencodeRuntimeAdapter;

    await expect(
      runtime.subscribeEvents("/tmp/conversation-workspace-1"),
    ).resolves.toBe(stream);
    expect(calls).toEqual([
      { directory: "/tmp/conversation-workspace-1" },
    ]);
  });
});

describe("OpencodeRuntimeAdapter interaction replies", () => {
  it("replies to permissions in the conversation workspace directory", async () => {
    const calls: unknown[] = [];
    const client = {
      permission: {
        reply: async (input: unknown) => {
          calls.push(input);
          return { data: true };
        },
      },
    } as unknown as OpencodeClient;
    const runtime = Object.assign(Object.create(OpencodeRuntimeAdapter.prototype), {
      ensureClient: async () => client,
    }) as OpencodeRuntimeAdapter;

    await runtime.replyPermission({
      requestId: "permission-1",
      sessionId: "session-1",
      directory: "/tmp/conversation-workspace-1",
      reply: "once",
    });

    expect(calls).toEqual([
      {
        requestID: "permission-1",
        directory: "/tmp/conversation-workspace-1",
        reply: "once",
      },
    ]);
  });

  it("fails when OpenCode returns no permission reply data", async () => {
    const client = {
      permission: {
        reply: async () => ({ data: undefined }),
      },
    } as unknown as OpencodeClient;
    const runtime = Object.assign(Object.create(OpencodeRuntimeAdapter.prototype), {
      ensureClient: async () => client,
    }) as OpencodeRuntimeAdapter;

    await expect(
      runtime.replyPermission({
        requestId: "permission-1",
        directory: "/tmp/conversation-workspace-1",
        reply: "once",
      }),
    ).rejects.toThrow("permission.reply returned no data");
  });
});

describe("OpencodeRuntimeAdapter.createSession", () => {
  it("creates a real chat session inside a dedicated conversation workspace", async () => {
    const workspaceRoot = await mkdtemp(join(tmpdir(), "tjwater-conversations-"));
    const calls: Array<Record<string, unknown>> = [];
    const client = {
      session: {
        create: async (input: Record<string, unknown>) => {
          calls.push(input);
          return {
            data: {
              id: "runtime-session-1",
              directory: input.directory,
            },
          };
        },
      },
    } as unknown as OpencodeClient;
    const runtime = Object.assign(Object.create(OpencodeRuntimeAdapter.prototype), {
      clientPromise: null,
      closeServer: null,
      ensureClient: async () => client,
    }) as OpencodeRuntimeAdapter;

    try {
      const session = await runtime.createSession("chat", {
        conversationWorkspace: true,
        workspaceRoot,
      });
      const directory = String(calls[0]?.directory);

      expect(relative(workspaceRoot, directory).startsWith("..")).toBe(false);
      const workspaceStat = await stat(directory);
      expect(workspaceStat.isDirectory()).toBe(true);
      expect(workspaceStat.mode & 0o777).toBe(0o700);
      expect(session.directory).toBe(directory);
      expect(calls[0]?.permission).toEqual([
        { permission: "read", pattern: `${directory}/**`, action: "allow" },
        { permission: "edit", pattern: `${directory}/**`, action: "ask" },
      ]);
    } finally {
      await rm(workspaceRoot, { force: true, recursive: true });
    }
  });

  it("removes an empty conversation workspace when session creation fails", async () => {
    const workspaceRoot = await mkdtemp(join(tmpdir(), "tjwater-conversations-"));
    const client = {
      session: {
        create: async () => {
          throw new Error("session creation failed");
        },
      },
    } as unknown as OpencodeClient;
    const runtime = Object.assign(Object.create(OpencodeRuntimeAdapter.prototype), {
      clientPromise: null,
      closeServer: null,
      ensureClient: async () => client,
    }) as OpencodeRuntimeAdapter;

    try {
      await expect(
        runtime.createSession("chat", {
          conversationWorkspace: true,
          workspaceRoot,
        }),
      ).rejects.toThrow("session creation failed");
      expect(await readdir(workspaceRoot)).toEqual([]);
    } finally {
      await rm(workspaceRoot, { force: true, recursive: true });
    }
  });
});

describe("OpencodeRuntimeAdapter.warmup", () => {
  it("initializes the project session and model tools before reporting ready", async () => {
    const calls: string[] = [];
    const client = {
      global: {
        health: async () => {
          calls.push("health");
          return { data: { healthy: true, version: "test" } };
        },
      },
      session: {
        create: async () => {
          calls.push("session.create");
          return { data: { id: "warmup-session" } };
        },
        delete: async ({ sessionID }: { sessionID: string }) => {
          calls.push(`session.delete:${sessionID}`);
          return { data: true };
        },
      },
      tool: {
        list: async (model: { provider: string; model: string }) => {
          calls.push(`tool.list:${model.provider}/${model.model}`);
          return { data: [] };
        },
      },
    } as unknown as OpencodeClient;
    const runtime = Object.assign(Object.create(OpencodeRuntimeAdapter.prototype), {
      clientPromise: null,
      closeServer: null,
      ensureClient: async () => client,
    }) as OpencodeRuntimeAdapter;

    await runtime.warmup();

    expect(calls).toEqual([
      "health",
      "session.create",
      `tool.list:${config.OPENCODE_MODEL}`,
      "session.delete:warmup-session",
    ]);
  });

  it("submits question answers through the stable question API", async () => {
    const calls: unknown[] = [];
    const client = {
      question: {
        reply: async (input: unknown) => {
          calls.push(input);
          return { data: { ok: true } };
        },
      },
    } as unknown as OpencodeClient;
    const runtime = Object.assign(Object.create(OpencodeRuntimeAdapter.prototype), {
      clientPromise: null,
      closeServer: null,
      ensureClient: async () => client,
    }) as OpencodeRuntimeAdapter;

    await runtime.replyQuestion({
      requestId: "question-1",
      sessionId: "session-1",
      directory: "/tmp/conversation-workspace-1",
      answers: [["继续"]],
    });

    expect(calls).toEqual([
      {
        requestID: "question-1",
        directory: "/tmp/conversation-workspace-1",
        answers: [["继续"]],
      },
    ]);
  });
});