import { describe, expect, it } from "bun:test";
import { type OpenCodeClient as OpencodeClient } from "@opencode/client";
import { createServer } from "node:net";
import { mkdtemp, rm } from "node:fs/promises";
import { tmpdir } from "node:os";
import { join } from "node:path";

import { config } from "../../src/config.js";
import {
  OpencodeRuntimeAdapter,
  resolveEmbeddedOpencodePort,
} 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: ["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.resolveAvailableModel", () => {
  it("selects the first preferred model actually exposed by OpenCode", async () => {
    const client = {
      rpc: { call: async () => ({ output: [] }) },
      model: {
        list: async () => ({ data: [{ providerID: "deepseek", id: "deepseek-v4-pro", enabled: true, capabilities: { tools: true } }] }),
      },
    } as unknown as OpencodeClient;
    const runtime = Object.assign(Object.create(OpencodeRuntimeAdapter.prototype), {
      ensureClient: async () => client,
    }) as OpencodeRuntimeAdapter;

    await expect(runtime.resolveAvailableModel([
      "deepseek/deepseek-flash",
      "deepseek/deepseek-v4-pro",
    ])).resolves.toBe("deepseek/deepseek-v4-pro");
  });
});

describe("resolveEmbeddedOpencodePort", () => {
  it("falls back to a dynamic port when the configured port is occupied", async () => {
    const server = createServer();
    await new Promise<void>((resolve, reject) => {
      server.once("error", reject);
      server.listen(0, "127.0.0.1", resolve);
    });

    const address = server.address();
    if (!address || typeof address === "string") {
      server.close();
      throw new Error("expected a TCP server address");
    }

    try {
      await expect(
        resolveEmbeddedOpencodePort("127.0.0.1", address.port),
      ).resolves.toBe(0);
    } finally {
      await new Promise<void>((resolve, reject) => {
        server.close((error) => (error ? reject(error) : resolve()));
      });
    }
  });
});

describe("OpencodeRuntimeAdapter.warmup", () => {
  const toolIds = ["shell", "web_search", "geocode", "query_project_data", "final_answer", "locate_features", "zoom_to_map", "show_chart", "view_history", "session_search", "memory_manager", "skill_manager", "render_scada_analysis", "clear_scada_analysis", "get_operational_task_context", "query_operational_task_data", "publish_execution_plan", "publish_task_report", "propose_task_action", "add_task_human_evidence", "request_task_data_access", "todoread", "todowrite"];
  async function createWarmupRuntime(missing: string[] = []) {
    const root = await mkdtemp(join(tmpdir(), "warmup-workspace-test-"));
    const previousRoot = config.CONVERSATION_WORKSPACE_ROOT;
    config.CONVERSATION_WORKSPACE_ROOT = root;
    const calls: string[] = [];
    const [providerID, id] = config.OPENCODE_MODEL.split("/");
    const client = {
      server: { info: async () => { calls.push("health"); return { version: "2.0.24" }; } },
      session: {
        create: async (input: { location: { directory: string } }) => { calls.push("session.create"); return { id: "warmup-session", location: input.location }; },
        remove: async () => { calls.push("session.remove"); },
      },
      model: { list: async () => { calls.push("model.list"); return { data: [{ providerID, id, enabled: true, capabilities: { tools: true } }] }; } },
      rpc: { call: async (input: { method: string }) => {
        if (input.method === "mcp") { calls.push("mcp.list"); return { output: { servers: [], configuration_errors: [] } }; }
        calls.push("tool.list");
        return { output: toolIds.filter((id) => !missing.includes(id)).map((id) => ({ id, direct: true, sandboxed: id === "shell", workspaceRoot: root })) };
      } },
    } as unknown as OpencodeClient;
    const runtime = Object.assign(Object.create(OpencodeRuntimeAdapter.prototype), { ensureClient: async () => client }) as OpencodeRuntimeAdapter;
    return { runtime, calls, cleanup: async () => { config.CONVERSATION_WORKSPACE_ROOT = previousRoot; await rm(root, { recursive: true, force: true }); } };
  }
  it("verifies business tools and model before reporting ready and removes the warmup session", async () => {
    const { runtime, calls, cleanup } = await createWarmupRuntime();
    try { await runtime.warmup();
    expect(calls).toEqual(["health", "session.create", "tool.list", "mcp.list", "model.list", "session.remove"]); } finally { await cleanup(); }
  });
  it("fails readiness if a business tool was lost and still cleans up", async () => {
    const { runtime, calls, cleanup } = await createWarmupRuntime(["render_scada_analysis"]);
    try { await expect(runtime.warmup()).rejects.toThrow("business tools missing: render_scada_analysis");
    expect(calls.at(-1)).toBe("session.remove"); } finally { await cleanup(); }
  });
});

describe("conversation workspace binding", () => {
  it("reads MCP status without migrating a legacy session or creating a workspace", async () => {
    let location: unknown;
    const runtime = Object.assign(Object.create(OpencodeRuntimeAdapter.prototype), {
      ensureClient: async () => ({
        session: { get: async () => ({ location: { directory: process.cwd() } }), move: async () => { throw new Error("GET must not move sessions"); } },
        rpc: { call: async (input: { location: unknown }) => { location = input.location; return { output: { servers: [], configuration_errors: [] } }; } },
      }),
      ensureSessionWorkspace: async () => { throw new Error("GET must not create workspaces"); },
    }) as OpencodeRuntimeAdapter;
    expect(await runtime.mcpStatus("legacy-session")).toEqual({ servers: [], configuration_errors: [] });
    expect(location).toEqual({ directory: process.cwd() });
  });

  it("coalesces old-session migration and restores its persisted directory", async () => {
    const previousRoot = config.CONVERSATION_WORKSPACE_ROOT;
    const root = await mkdtemp(join(tmpdir(), "runtime-workspace-test-"));
    config.CONVERSATION_WORKSPACE_ROOT = root;
    let directory = process.cwd();
    let moves = 0;
    const client = {
      session: {
        get: async () => ({ id: "old-session", location: { directory } }),
        move: async (input: { directory: string }) => { moves++; directory = input.directory; },
      },
    } as unknown as OpencodeClient;
    const runtime = Object.assign(Object.create(OpencodeRuntimeAdapter.prototype), { ensureClient: async () => client }) as OpencodeRuntimeAdapter;
    try {
      const [first, second] = await Promise.all([runtime.ensureSessionWorkspace("old-session"), runtime.ensureSessionWorkspace("old-session")]);
      expect(first).toBe(second);
      expect(first).not.toBe(process.cwd());
      expect(moves).toBe(1);
      const restored = Object.assign(Object.create(OpencodeRuntimeAdapter.prototype), { ensureClient: async () => client }) as OpencodeRuntimeAdapter;
      expect(await restored.ensureSessionWorkspace("old-session")).toBe(first);
      expect(moves).toBe(1);
      directory = "/tmp";
      await expect(restored.ensureSessionWorkspace("foreign-session")).rejects.toThrow("inside");
    } finally { config.CONVERSATION_WORKSPACE_ROOT = previousRoot; await rm(root, { recursive: true }); }
  });
});

describe("explicit native Shell approval", () => {
  it("ties the pending decision to the full command and originating native call", async () => {
    const events = [
      { type: "connected" },
      { type: "permission.replied", data: { sessionID: "other", requestID: "perm-test", reply: "once" } },
      { type: "permission.replied", data: { sessionID: "session-test", requestID: "perm-test", reply: "once" } },
    ];
    let created: unknown;
    const client = {
      event: { subscribe: () => ({ async *[Symbol.asyncIterator]() { for (const event of events) yield event; } }) },
      permission: { create: async (input: unknown) => { created = input; return { id: "perm-test", effect: "ask" }; } },
    } as unknown as OpencodeClient;
    const runtime = Object.assign(Object.create(OpencodeRuntimeAdapter.prototype), { ensureClient: async () => client }) as OpencodeRuntimeAdapter;
    await runtime.approveSandboxShell({ sessionId: "session-test", command: "printf hello", callId: "call-test", messageId: "message-test" }, new AbortController().signal);
    expect(created).toMatchObject({ action: "shell", resources: ["printf hello"], save: [], source: { type: "tool", id: "call-test", messageID: "message-test" } });
    events[2] = { type: "permission.replied", data: { sessionID: "session-test", requestID: "perm-test", reply: "reject" } };
    await expect(runtime.approveSandboxShell({ sessionId: "session-test", command: "printf hello", callId: "call-test", messageId: "message-test" }, new AbortController().signal)).rejects.toThrow("rejected");
  });
});