/* eslint-disable max-lines-per-function -- Test suites naturally have many cases */
import { beforeEach, describe, expect, it, vi } from "vitest";
import { Hono } from "hono";

vi.mock("../../src/services/logger.js", () => ({
  logger: {
    log: vi.fn().mockResolvedValue(undefined),
    error: vi.fn().mockResolvedValue(undefined),
  },
}));

describe("frontend route", () => {
  let loggerMock: { log: ReturnType<typeof vi.fn>; error: ReturnType<typeof vi.fn> };

  beforeEach(async () => {
    vi.clearAllMocks();
    const { logger } = await import("../../src/services/logger.js");
    loggerMock = logger as typeof loggerMock;
  });

  const makeApp = async () => {
    const { frontendRouter } = await import("../../src/routes/frontend.js");
    const app = new Hono();
    app.route("/frontend", frontendRouter);
    return app;
  };

  const postLog = async (body: unknown, contentType = "application/json") => {
    const app = await makeApp();
    return app.fetch(new Request("http://localhost/frontend/log", {
      method: "POST",
      headers: { "Content-Type": contentType },
      body: typeof body === "string" ? body : JSON.stringify(body),
    }));
  };

  const postError = async (body: unknown, contentType = "application/json") => {
    const app = await makeApp();
    return app.fetch(new Request("http://localhost/frontend/error", {
      method: "POST",
      headers: { "Content-Type": contentType },
      body: typeof body === "string" ? body : JSON.stringify(body),
    }));
  };

  describe("POST /log", () => {
    it("returns 200 when level is debug and message is present", async () => {
      const res = await postLog({ level: "debug", message: "test debug" });
      expect(res.status).toBe(200);
      const body = await res.json() as { ok: boolean };
      expect(body.ok).toBe(true);
    });

    it("returns 200 when level is info and message is present", async () => {
      const res = await postLog({ level: "info", message: "test info" });
      expect(res.status).toBe(200);
      const body = await res.json() as { ok: boolean };
      expect(body.ok).toBe(true);
    });

    it("returns 200 when level is warn and message is present", async () => {
      const res = await postLog({ level: "warn", message: "test warn" });
      expect(res.status).toBe(200);
      const body = await res.json() as { ok: boolean };
      expect(body.ok).toBe(true);
    });

    it("returns 400 when level is invalid", async () => {
      const res = await postLog({ level: "error", message: "test" });
      expect(res.status).toBe(400);
      const body = await res.json() as { error: string };
      expect(body.error).toBe("level and message are required");
    });

    it("returns 400 when level is missing", async () => {
      const res = await postLog({ message: "test" });
      expect(res.status).toBe(400);
    });

    it("returns 400 when message is missing", async () => {
      const res = await postLog({ level: "info" });
      expect(res.status).toBe(400);
    });

    it("returns 500 when request body is invalid JSON", async () => {
      const res = await postLog("not valid json at all", "application/json");
      expect(res.status).toBe(500);
      const body = await res.json() as { error: string };
      expect(body.error).toBe("Internal server error");
    });

    it("returns 500 and covers non-Error branch when logger throws a raw value", async () => {
      loggerMock.log.mockImplementationOnce(() => { throw "raw string error"; });
      const res = await postLog({ level: "info", message: "test" });
      expect(res.status).toBe(500);
      const body = await res.json() as { error: string };
      expect(body.error).toBe("Internal server error");
    });
  });

  describe("POST /error", () => {
    it("returns 200 with valid context and message", async () => {
      const res = await postError({ context: "SomeComponent", message: "Something went wrong" });
      expect(res.status).toBe(200);
      const body = await res.json() as { ok: boolean };
      expect(body.ok).toBe(true);
    });

    it("returns 400 when context field is missing", async () => {
      const res = await postError({ message: "Something went wrong" });
      expect(res.status).toBe(400);
      const body = await res.json() as { error: string };
      expect(body.error).toBe("context and message are required");
    });

    it("returns 400 when message field is missing", async () => {
      const res = await postError({ context: "SomeComponent" });
      expect(res.status).toBe(400);
    });

    it("returns 500 when request body is invalid JSON", async () => {
      const res = await postError("not valid json at all", "application/json");
      expect(res.status).toBe(500);
      const body = await res.json() as { error: string };
      expect(body.error).toBe("Internal server error");
    });

    it("returns 500 and covers non-Error branch when logger throws a raw value", async () => {
      loggerMock.error.mockImplementationOnce(() => { throw "raw string error"; });
      const res = await postError({ context: "SomeComponent", message: "Something went wrong" });
      expect(res.status).toBe(500);
      const body = await res.json() as { error: string };
      expect(body.error).toBe("Internal server error");
    });
  });
});