import type Database from "bun:sqlite";

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

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

import { createNoopLogger } from "../../../src/server/logger";
import { createMigratedMemoryTestDatabase } from "../../helpers";
import "../mocks/ai";

const MODE: RuntimeMode = "test";
const LOG = createNoopLogger();

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

function createTestModel(db: Database, pName: string, providerId?: string): Model {
  const pid = providerId ?? seedProvider(db);
  const result = createModel(
    db,
    {
      capabilities: ["text"],
      modelId: pName.toLowerCase().replace(/[^a-z0-9-]/g, "-"),
      name: pName,
      providerId: pid,
    },
    LOG,
  );
  if ("error" in result) throw new Error(result.error);
  return result.model;
}

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

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

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

import { createModel } from "../../../src/server/db/models";
import { createProvider } from "../../../src/server/db/providers";

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

async function testModelViaHandler(req: Request, db: Database): Promise<Response> {
  const { handleTestModelConfig: h } = await import("../../../src/server/routes/models/test");
  return h(req, db, MODE, LOG);
}

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

async function withRouteDb(callback: (db: Database) => Promise<void>): Promise<void> {
  const handle = createMigratedMemoryTestDatabase("route-model-test");
  try {
    await callback(handle.db);
    handle.close();
  } finally {
    handle.cleanup();
  }
}

describe("models API routes", () => {
  test("POST /api/models create", async () => {
    await withRouteDb(async (db) => {
      const providerId = seedProvider(db);

      const req = new Request("http://localhost/api/models", {
        body: JSON.stringify({
          capabilities: ["text", "reasoning"],
          modelId: "gpt-4o",
          name: "GPT-4o",
          providerId,
        }),
        headers: { "Content-Type": "application/json" },
        method: "POST",
      });
      const res = await createModelViaHandler(req, db);
      expect(res.status).toBe(201);
      const body = (await res.json()) as { model: Model };
      expect(body.model.name).toBe("GPT-4o");
      expect(body.model.modelId).toBe("gpt-4o");
    });
  });

  test("GET /api/models list", async () => {
    await withRouteDb(async (db) => {
      const p1 = seedProvider(db, "ListP1");
      const p2 = seedProvider(db, "ListP2");
      createTestModel(db, "A-Model", p1);
      createTestModel(db, "B-Model", p2);

      const req = new Request("http://localhost/api/models?page=1&pageSize=20");
      const res = await listModelsViaHandler(req, db);
      expect(res.status).toBe(200);
      const body = (await res.json()) as { items: Model[]; total: number };
      expect(body.total).toBe(2);
      expect(body.items.length).toBe(2);
    });
  });

  test("GET /api/models sortBy + sortOrder", async () => {
    await withRouteDb(async (db) => {
      const p = seedProvider(db, "SortP");
      createTestModel(db, "Beta", p);
      createTestModel(db, "Alpha", p);

      const req = new Request("http://localhost/api/models?page=1&pageSize=20&sortBy=name&sortOrder=asc");
      const res = await listModelsViaHandler(req, db);
      expect(res.status).toBe(200);
      const body = (await res.json()) as { items: Model[] };
      expect(body.items[0]!.name).toBe("Alpha");
      expect(body.items[1]!.name).toBe("Beta");
    });
  });

  test("GET /api/models filter by capabilities", async () => {
    await withRouteDb(async (db) => {
      const p = seedProvider(db, "CapP");
      createModel(db, { capabilities: ["text"], modelId: "text-1", name: "TextModel", providerId: p }, LOG);
      createModel(
        db,
        { capabilities: ["reasoning"], modelId: "reasoning-1", name: "ReasoningModel", providerId: p },
        LOG,
      );

      const req = new Request("http://localhost/api/models?page=1&pageSize=20&capabilities=text");
      const res = await listModelsViaHandler(req, db);
      expect(res.status).toBe(200);
      const body = (await res.json()) as { items: Model[]; total: number };
      expect(body.total).toBe(1);
      expect(body.items[0]!.name).toBe("TextModel");
    });
  });

  test("GET /api/models rejects invalid sortBy", async () => {
    await withRouteDb(async (db) => {
      const req = new Request("http://localhost/api/models?page=1&pageSize=20&sortBy=evil");
      const res = await listModelsViaHandler(req, db);
      expect(res.status).toBe(400);
    });
  });

  test("GET /api/models filter by providerId", async () => {
    await withRouteDb(async (db) => {
      const p1 = seedProvider(db, "P1");
      const p2 = seedProvider(db, "P2");
      createTestModel(db, "M1", p1);
      createTestModel(db, "M2", p2);

      const res = await listModelsViaHandler(
        new Request("http://localhost/api/models?page=1&pageSize=20&providerId=" + p1),
        db,
      );
      expect(res.status).toBe(200);
      const body = (await res.json()) as { items: Model[]; total: number };
      expect(body.total).toBe(1);
    });
  });

  test("GET /api/models/:id get detail", async () => {
    await withRouteDb(async (db) => {
      const model = createTestModel(db, "Detail");

      const req = new Request("http://localhost/api/models/" + model.id);
      const res = await getModelViaHandler(req, db);
      expect(res.status).toBe(200);
      const body = (await res.json()) as { model: Model };
      expect(body.model.name).toBe("Detail");
    });
  });

  test("PATCH /api/models/:id update", async () => {
    await withRouteDb(async (db) => {
      const model = createTestModel(db, "OldName");

      const req = new Request("http://localhost/api/models/" + model.id, {
        body: JSON.stringify({ name: "Updated" }),
        headers: { "Content-Type": "application/json" },
        method: "PATCH",
      });
      const res = await updateModelViaHandler(req, db);
      expect(res.status).toBe(200);
      const body = (await res.json()) as { model: Model };
      expect(body.model.name).toBe("Updated");
    });
  });

  test("DELETE /api/models/:id", async () => {
    await withRouteDb(async (db) => {
      const model = createTestModel(db, "DeleteTest");

      const req = new Request("http://localhost/api/models/" + model.id, { method: "DELETE" });
      const res = await deleteModelViaHandler(req, db);
      expect(res.status).toBe(204);
    });
  });

  test("invalid capabilities returns 400", async () => {
    await withRouteDb(async (db) => {
      const providerId = seedProvider(db);

      const req = new Request("http://localhost/api/models", {
        body: JSON.stringify({
          capabilities: ["invalid-cap"],
          modelId: "test",
          name: "Test",
          providerId,
        }),
        headers: { "Content-Type": "application/json" },
        method: "POST",
      });
      const res = await createModelViaHandler(req, db);
      expect(res.status).toBe(400);
    });
  });

  test("invalid numeric fields return 400", async () => {
    await withRouteDb(async (db) => {
      const providerId = seedProvider(db);

      const createReq = new Request("http://localhost/api/models", {
        body: JSON.stringify({
          capabilities: ["text"],
          contextLength: 0,
          modelId: "test",
          name: "Test",
          providerId,
        }),
        headers: { "Content-Type": "application/json" },
        method: "POST",
      });
      const createRes = await createModelViaHandler(createReq, db);
      expect(createRes.status).toBe(400);

      const model = createTestModel(db, "NumericTest", providerId);
      const updateReq = new Request("http://localhost/api/models/" + model.id, {
        body: JSON.stringify({ maxOutputTokens: 1.5 }),
        headers: { "Content-Type": "application/json" },
        method: "PATCH",
      });
      const updateRes = await updateModelViaHandler(updateReq, db);
      expect(updateRes.status).toBe(400);
    });
  });

  test("POST /api/models/test 成功测试模型连接", async () => {
    await withRouteDb(async (db) => {
      const providerId = seedProvider(db);

      const req = new Request("http://localhost/api/models/test", {
        body: JSON.stringify({ modelId: "gpt-4o", providerId }),
        headers: { "Content-Type": "application/json" },
        method: "POST",
      });
      const res = await testModelViaHandler(req, db);
      expect(res.status).toBe(200);
      const body = (await res.json()) as { modelTestResponse: { message: string; ok: boolean } };
      expect(body.modelTestResponse.ok).toBe(true);
      expect(body.modelTestResponse.message).toContain("模型连接成功");
    });
  });

  test("POST /api/models/test 缺少 providerId 返回 400", async () => {
    await withRouteDb(async (db) => {
      const req = new Request("http://localhost/api/models/test", {
        body: JSON.stringify({ modelId: "gpt-4o" }),
        headers: { "Content-Type": "application/json" },
        method: "POST",
      });
      const res = await testModelViaHandler(req, db);
      expect(res.status).toBe(400);
    });
  });

  test("POST /api/models/test 不存在的供应商返回 404", async () => {
    await withRouteDb(async (db) => {
      const req = new Request("http://localhost/api/models/test", {
        body: JSON.stringify({ modelId: "gpt-4o", providerId: "nonexistent" }),
        headers: { "Content-Type": "application/json" },
        method: "POST",
      });
      const res = await testModelViaHandler(req, db);
      expect(res.status).toBe(404);
    });
  });
});