import type Database from "bun:sqlite";

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

import type { Conversation, Message, RuntimeMode } from "../../../src/shared/api";

import { createModel } from "../../../src/server/db/models";
import { createProject } from "../../../src/server/db/projects";
import { createProvider } from "../../../src/server/db/providers";
import { createNoopLogger } from "../../../src/server/logger";
import { createMigratedMemoryTestDatabase } from "../../helpers";

const MODE: RuntimeMode = "test";

void mock.module("ai", () => ({
  createAgentUIStreamResponse: () =>
    Promise.resolve(
      new Response(
        'data: {"type":"start-step"}\n\ndata: {"type":"text-start","id":"txt-1"}\n\ndata: {"type":"text-delta","id":"txt-1","delta":"test reply from AI"}\n\ndata: {"type":"text-end","id":"txt-1"}\n\ndata: {"type":"finish-step"}\n\ndata: {"type":"finish"}\n\n',
        {
          headers: { "Content-Type": "text/event-stream" },
        },
      ),
    ),
  createProviderRegistry: () => ({
    languageModel: () => ({}),
  }),
  generateText: () => Promise.resolve({ text: "", usage: {} }),
  stepCountIs: () => () => true,
  tool: () => ({ execute: async () => await Promise.resolve({}) }),
  ToolLoopAgent: function M() {
    // no-op: createAgentUIStreamResponse handles streaming
  },
}));

async function createConversationViaHandler(req: Request, db: Database): Promise<Response> {
  const { handleCreateConversation: h } = await import("../../../src/server/routes/chat/create");
  return h(req, db, MODE);
}

async function deleteConversationViaHandler(req: Request, db: Database): Promise<Response> {
  const { handleDeleteConversation: h } = await import("../../../src/server/routes/chat/delete");
  return h(req, db, MODE);
}

async function getConversationViaHandler(req: Request, db: Database): Promise<Response> {
  const { handleGetConversation: h } = await import("../../../src/server/routes/chat/get");
  return h(req, db, MODE);
}

async function listConversationsViaHandler(req: Request, db: Database): Promise<Response> {
  const { handleListConversations: h } = await import("../../../src/server/routes/chat/list");
  return h(req, db, MODE);
}

async function listMessagesViaHandler(req: Request, db: Database): Promise<Response> {
  const { handleListMessages: h } = await import("../../../src/server/routes/chat/messages");
  return h(req, db, MODE);
}

async function patchConversationViaHandler(req: Request, db: Database): Promise<Response> {
  const { handleUpdateConversation: h } = await import("../../../src/server/routes/chat/update");
  return h(req, db, MODE);
}

function seedModel(db: Database, providerId: string, modelName = "GPT-4o", modelId = "gpt-4o"): string {
  const result = createModel(db, {
    capabilities: ["text"],
    modelId,
    name: modelName,
    providerId,
  });
  if ("error" in result) throw new Error(result.error);
  return result.model.id;
}

function seedProject(db: Database, name = "测试项目"): string {
  const result = createProject(db, { description: "测试", name });
  if ("error" in result) throw new Error(result.error);
  return result.project.id;
}

function seedProvider(db: Database, name = "测试供应商"): string {
  const result = createProvider(db, {
    apiKey: "sk-test",
    baseUrl: "https://api.test.com/v1",
    name,
    type: "openai",
  });
  if ("error" in result) throw new Error(result.error);
  return result.provider.id;
}

async function sendChatViaHandler(req: Request, db: Database): Promise<Response> {
  const { handleSendChat: h } = await import("../../../src/server/routes/chat/send");
  return h(req, db, MODE, createNoopLogger());
}

describe("聊天 API 路由", () => {
  describe("POST /api/projects/:id/conversations", () => {
    test("创建会话成功", async () => {
      const handle = createMigratedMemoryTestDatabase("chat-create");
      try {
        const db = handle.db;
        const projectId = seedProject(db);
        const providerId = seedProvider(db);
        seedModel(db, providerId);

        const req = new Request(`http://localhost/api/projects/${projectId}/conversations`, {
          body: JSON.stringify({}),
          headers: { "Content-Type": "application/json" },
          method: "POST",
        });
        const res = await createConversationViaHandler(req, db);
        expect(res.status).toBe(201);
        const body = (await res.json()) as { conversation: Conversation };
        expect(body.conversation.title).toBe("新会话");
        expect(body.conversation.projectId).toBe(projectId);
        handle.close();
      } finally {
        handle.cleanup();
      }
    });

    test("无可用模型时返回 400", async () => {
      const handle = createMigratedMemoryTestDatabase("chat-create-no-model");
      try {
        const db = handle.db;
        const projectId = seedProject(db);

        const req = new Request(`http://localhost/api/projects/${projectId}/conversations`, {
          body: JSON.stringify({}),
          headers: { "Content-Type": "application/json" },
          method: "POST",
        });
        const res = await createConversationViaHandler(req, db);
        expect(res.status).toBe(400);
        const body = (await res.json()) as { error: string };
        expect(body.error).toContain("模型");
        handle.close();
      } finally {
        handle.cleanup();
      }
    });
  });

  describe("GET /api/projects/:id/conversations", () => {
    test("列出项目会话", async () => {
      const handle = createMigratedMemoryTestDatabase("chat-list");
      try {
        const db = handle.db;
        const projectId = seedProject(db);
        const providerId = seedProvider(db);
        seedModel(db, providerId);

        const req1 = new Request(`http://localhost/api/projects/${projectId}/conversations`, {
          body: JSON.stringify({}),
          headers: { "Content-Type": "application/json" },
          method: "POST",
        });
        await createConversationViaHandler(req1, db);

        const req2 = new Request(`http://localhost/api/projects/${projectId}/conversations?page=1&pageSize=10`);
        const res = await listConversationsViaHandler(req2, db);
        expect(res.status).toBe(200);
        const body = (await res.json()) as { items: Conversation[]; total: number };
        expect(body.total).toBe(1);
        expect(body.items[0]?.title).toBe("新会话");
        handle.close();
      } finally {
        handle.cleanup();
      }
    });

    test("不同项目会话隔离", async () => {
      const handle = createMigratedMemoryTestDatabase("chat-isolation");
      try {
        const db = handle.db;
        const projectA = seedProject(db, "项目A");
        const projectB = seedProject(db, "项目B");
        const providerId = seedProvider(db);
        seedModel(db, providerId);

        await createConversationViaHandler(
          new Request(`http://localhost/api/projects/${projectA}/conversations`, {
            body: JSON.stringify({}),
            headers: { "Content-Type": "application/json" },
            method: "POST",
          }),
          db,
        );

        const res = await listConversationsViaHandler(
          new Request(`http://localhost/api/projects/${projectB}/conversations?page=1&pageSize=10`),
          db,
        );
        const body = (await res.json()) as { items: Conversation[]; total: number };
        expect(body.total).toBe(0);
        handle.close();
      } finally {
        handle.cleanup();
      }
    });
  });

  describe("GET /api/projects/:id/conversations/:cid", () => {
    test("获取会话详情成功", async () => {
      const handle = createMigratedMemoryTestDatabase("chat-get");
      try {
        const db = handle.db;
        const projectId = seedProject(db);
        const providerId = seedProvider(db);
        seedModel(db, providerId);

        const createRes = await createConversationViaHandler(
          new Request(`http://localhost/api/projects/${projectId}/conversations`, {
            body: JSON.stringify({}),
            headers: { "Content-Type": "application/json" },
            method: "POST",
          }),
          db,
        );
        const created = ((await createRes.json()) as { conversation: Conversation }).conversation;

        const res = await getConversationViaHandler(
          new Request(`http://localhost/api/projects/${projectId}/conversations/${created.id}`),
          db,
        );
        expect(res.status).toBe(200);
        const body = (await res.json()) as { conversation: Conversation };
        expect(body.conversation.title).toBe("新会话");
        handle.close();
      } finally {
        handle.cleanup();
      }
    });

    test("不存在的会话返回 404", async () => {
      const handle = createMigratedMemoryTestDatabase("chat-get-404");
      try {
        const db = handle.db;
        const projectId = seedProject(db);

        const res = await getConversationViaHandler(
          new Request(`http://localhost/api/projects/${projectId}/conversations/nonexistent`),
          db,
        );
        expect(res.status).toBe(404);
        handle.close();
      } finally {
        handle.cleanup();
      }
    });

    test("跨项目获取会话返回 403", async () => {
      const handle = createMigratedMemoryTestDatabase("chat-get-403");
      try {
        const db = handle.db;
        const projectA = seedProject(db, "项目A");
        const projectB = seedProject(db, "项目B");
        const providerId = seedProvider(db);
        seedModel(db, providerId);

        const createRes = await createConversationViaHandler(
          new Request(`http://localhost/api/projects/${projectA}/conversations`, {
            body: JSON.stringify({}),
            headers: { "Content-Type": "application/json" },
            method: "POST",
          }),
          db,
        );
        const created = ((await createRes.json()) as { conversation: Conversation }).conversation;

        const res = await getConversationViaHandler(
          new Request(`http://localhost/api/projects/${projectB}/conversations/${created.id}`),
          db,
        );
        expect(res.status).toBe(403);
        const body = (await res.json()) as { error: string };
        expect(body.error).toContain("不属于该项目");
        handle.close();
      } finally {
        handle.cleanup();
      }
    });
  });

  describe("DELETE /api/projects/:id/conversations/:cid", () => {
    test("删除会话成功", async () => {
      const handle = createMigratedMemoryTestDatabase("chat-delete");
      try {
        const db = handle.db;
        const projectId = seedProject(db);
        const providerId = seedProvider(db);
        seedModel(db, providerId);

        const createRes = await createConversationViaHandler(
          new Request(`http://localhost/api/projects/${projectId}/conversations`, {
            body: JSON.stringify({}),
            headers: { "Content-Type": "application/json" },
            method: "POST",
          }),
          db,
        );
        const created = ((await createRes.json()) as { conversation: Conversation }).conversation;

        const res = await deleteConversationViaHandler(
          new Request(`http://localhost/api/projects/${projectId}/conversations/${created.id}`, { method: "DELETE" }),
          db,
        );
        expect(res.status).toBe(200);

        const getRes = await getConversationViaHandler(
          new Request(`http://localhost/api/projects/${projectId}/conversations/${created.id}`),
          db,
        );
        expect(getRes.status).toBe(404);
        handle.close();
      } finally {
        handle.cleanup();
      }
    });

    test("跨项目删除会话返回 403", async () => {
      const handle = createMigratedMemoryTestDatabase("chat-delete-403");
      try {
        const db = handle.db;
        const projectA = seedProject(db, "项目A");
        const projectB = seedProject(db, "项目B");
        const providerId = seedProvider(db);
        seedModel(db, providerId);

        const createRes = await createConversationViaHandler(
          new Request(`http://localhost/api/projects/${projectA}/conversations`, {
            body: JSON.stringify({}),
            headers: { "Content-Type": "application/json" },
            method: "POST",
          }),
          db,
        );
        const created = ((await createRes.json()) as { conversation: Conversation }).conversation;

        const res = await deleteConversationViaHandler(
          new Request(`http://localhost/api/projects/${projectB}/conversations/${created.id}`, { method: "DELETE" }),
          db,
        );
        expect(res.status).toBe(403);

        const getRes = await getConversationViaHandler(
          new Request(`http://localhost/api/projects/${projectA}/conversations/${created.id}`),
          db,
        );
        expect(getRes.status).toBe(200);
        handle.close();
      } finally {
        handle.cleanup();
      }
    });
  });

  describe("PATCH /api/projects/:id/conversations/:cid", () => {
    test("更新会话 modelId 成功", async () => {
      const handle = createMigratedMemoryTestDatabase("chat-patch-model");
      try {
        const db = handle.db;
        const projectId = seedProject(db);
        const providerId = seedProvider(db);
        const modelId1 = seedModel(db, providerId, "GPT-4o", "gpt-4o");
        const modelId2 = seedModel(db, providerId, "GPT-4o-mini", "gpt-4o-mini");

        const createRes = await createConversationViaHandler(
          new Request(`http://localhost/api/projects/${projectId}/conversations`, {
            body: JSON.stringify({ modelId: modelId1 }),
            headers: { "Content-Type": "application/json" },
            method: "POST",
          }),
          db,
        );
        const created = ((await createRes.json()) as { conversation: Conversation }).conversation;

        const res = await patchConversationViaHandler(
          new Request(`http://localhost/api/projects/${projectId}/conversations/${created.id}`, {
            body: JSON.stringify({ modelId: modelId2 }),
            headers: { "Content-Type": "application/json" },
            method: "PATCH",
          }),
          db,
        );
        expect(res.status).toBe(200);
        const body = (await res.json()) as { conversation: Conversation };
        expect(body.conversation.modelId).toBe(modelId2);
        handle.close();
      } finally {
        handle.cleanup();
      }
    });

    test("更新会话 title 成功", async () => {
      const handle = createMigratedMemoryTestDatabase("chat-patch-title");
      try {
        const db = handle.db;
        const projectId = seedProject(db);
        const providerId = seedProvider(db);
        seedModel(db, providerId);

        const createRes = await createConversationViaHandler(
          new Request(`http://localhost/api/projects/${projectId}/conversations`, {
            body: JSON.stringify({}),
            headers: { "Content-Type": "application/json" },
            method: "POST",
          }),
          db,
        );
        const created = ((await createRes.json()) as { conversation: Conversation }).conversation;

        const res = await patchConversationViaHandler(
          new Request(`http://localhost/api/projects/${projectId}/conversations/${created.id}`, {
            body: JSON.stringify({ title: "新标题" }),
            headers: { "Content-Type": "application/json" },
            method: "PATCH",
          }),
          db,
        );
        expect(res.status).toBe(200);
        const body = (await res.json()) as { conversation: Conversation };
        expect(body.conversation.title).toBe("新标题");
        handle.close();
      } finally {
        handle.cleanup();
      }
    });

    test("跨项目更新会话返回 403", async () => {
      const handle = createMigratedMemoryTestDatabase("chat-patch-403");
      try {
        const db = handle.db;
        const projectA = seedProject(db, "项目A");
        const projectB = seedProject(db, "项目B");
        const providerId = seedProvider(db);
        seedModel(db, providerId);

        const createRes = await createConversationViaHandler(
          new Request(`http://localhost/api/projects/${projectA}/conversations`, {
            body: JSON.stringify({}),
            headers: { "Content-Type": "application/json" },
            method: "POST",
          }),
          db,
        );
        const created = ((await createRes.json()) as { conversation: Conversation }).conversation;

        const res = await patchConversationViaHandler(
          new Request(`http://localhost/api/projects/${projectB}/conversations/${created.id}`, {
            body: JSON.stringify({ title: "探测" }),
            headers: { "Content-Type": "application/json" },
            method: "PATCH",
          }),
          db,
        );
        expect(res.status).toBe(403);
        handle.close();
      } finally {
        handle.cleanup();
      }
    });

    test("不存在的会话返回 404", async () => {
      const handle = createMigratedMemoryTestDatabase("chat-patch-404");
      try {
        const db = handle.db;
        const projectId = seedProject(db);

        const res = await patchConversationViaHandler(
          new Request(`http://localhost/api/projects/${projectId}/conversations/nonexistent`, {
            body: JSON.stringify({ title: "探测" }),
            headers: { "Content-Type": "application/json" },
            method: "PATCH",
          }),
          db,
        );
        expect(res.status).toBe(404);
        handle.close();
      } finally {
        handle.cleanup();
      }
    });

    test("无效 modelId 返回 400", async () => {
      const handle = createMigratedMemoryTestDatabase("chat-patch-bad-model");
      try {
        const db = handle.db;
        const projectId = seedProject(db);
        const providerId = seedProvider(db);
        seedModel(db, providerId);

        const createRes = await createConversationViaHandler(
          new Request(`http://localhost/api/projects/${projectId}/conversations`, {
            body: JSON.stringify({}),
            headers: { "Content-Type": "application/json" },
            method: "POST",
          }),
          db,
        );
        const created = ((await createRes.json()) as { conversation: Conversation }).conversation;

        const res = await patchConversationViaHandler(
          new Request(`http://localhost/api/projects/${projectId}/conversations/${created.id}`, {
            body: JSON.stringify({ modelId: "invalid-model-id" }),
            headers: { "Content-Type": "application/json" },
            method: "PATCH",
          }),
          db,
        );
        expect(res.status).toBe(400);
        handle.close();
      } finally {
        handle.cleanup();
      }
    });
  });

  describe("GET /api/projects/:id/conversations/:cid/messages", () => {
    test("跨项目获取消息返回 403", async () => {
      const handle = createMigratedMemoryTestDatabase("chat-msg-403");
      try {
        const db = handle.db;
        const projectA = seedProject(db, "项目A");
        const projectB = seedProject(db, "项目B");
        const providerId = seedProvider(db);
        seedModel(db, providerId);

        const createRes = await createConversationViaHandler(
          new Request(`http://localhost/api/projects/${projectA}/conversations`, {
            body: JSON.stringify({}),
            headers: { "Content-Type": "application/json" },
            method: "POST",
          }),
          db,
        );
        const created = ((await createRes.json()) as { conversation: Conversation }).conversation;

        const res = await listMessagesViaHandler(
          new Request(
            `http://localhost/api/projects/${projectB}/conversations/${created.id}/messages?page=1&pageSize=10`,
          ),
          db,
        );
        expect(res.status).toBe(403);
        handle.close();
      } finally {
        handle.cleanup();
      }
    });
  });

  describe("POST /api/projects/:id/chat", () => {
    test("发送消息成功", async () => {
      const handle = createMigratedMemoryTestDatabase("chat-send");
      try {
        const db = handle.db;
        const projectId = seedProject(db);
        const providerId = seedProvider(db);
        const modelId = seedModel(db, providerId);

        const createRes = await createConversationViaHandler(
          new Request(`http://localhost/api/projects/${projectId}/conversations`, {
            body: JSON.stringify({}),
            headers: { "Content-Type": "application/json" },
            method: "POST",
          }),
          db,
        );
        const created = ((await createRes.json()) as { conversation: Conversation }).conversation;

        const res = await sendChatViaHandler(
          new Request(`http://localhost/api/projects/${projectId}/chat`, {
            body: JSON.stringify({
              conversationId: created.id,
              messages: [{ content: "你好", role: "user" }],
              modelDbId: modelId,
            }),
            headers: { "Content-Type": "application/json" },
            method: "POST",
          }),
          db,
        );
        expect(res.status).toBe(200);

        const msgRes = await listMessagesViaHandler(
          new Request(
            `http://localhost/api/projects/${projectId}/conversations/${created.id}/messages?page=1&pageSize=10`,
          ),
          db,
        );
        const msgBody = (await msgRes.json()) as { items: Message[] };
        expect(msgBody.items.length).toBeGreaterThanOrEqual(1);
        expect(msgBody.items.some((m) => m.role === "user")).toBe(true);
        handle.close();
      } finally {
        handle.cleanup();
      }
    });

    test("缺少 conversationId 返回 400", async () => {
      const handle = createMigratedMemoryTestDatabase("chat-send-400");
      try {
        const db = handle.db;
        const projectId = seedProject(db);

        const res = await sendChatViaHandler(
          new Request(`http://localhost/api/projects/${projectId}/chat`, {
            body: JSON.stringify({ messages: [{ content: "hi", role: "user" }] }),
            headers: { "Content-Type": "application/json" },
            method: "POST",
          }),
          db,
        );
        expect(res.status).toBe(400);
        handle.close();
      } finally {
        handle.cleanup();
      }
    });

    test("跨项目发送消息返回 403", async () => {
      const handle = createMigratedMemoryTestDatabase("chat-send-403");
      try {
        const db = handle.db;
        const projectA = seedProject(db, "项目A");
        const projectB = seedProject(db, "项目B");
        const providerId = seedProvider(db);
        const modelId = seedModel(db, providerId);

        const createRes = await createConversationViaHandler(
          new Request(`http://localhost/api/projects/${projectA}/conversations`, {
            body: JSON.stringify({}),
            headers: { "Content-Type": "application/json" },
            method: "POST",
          }),
          db,
        );
        const created = ((await createRes.json()) as { conversation: Conversation }).conversation;

        const res = await sendChatViaHandler(
          new Request(`http://localhost/api/projects/${projectB}/chat`, {
            body: JSON.stringify({
              conversationId: created.id,
              messages: [{ content: "探测", role: "user" }],
              modelDbId: modelId,
            }),
            headers: { "Content-Type": "application/json" },
            method: "POST",
          }),
          db,
        );
        expect(res.status).toBe(403);
        handle.close();
      } finally {
        handle.cleanup();
      }
    });
  });
});