package handler

import (
	"bytes"
	"context"
	"net/http"
	"net/http/httptest"
	"testing"

	"github.com/go-chi/chi/v5"
)

func TestTaskHandler_Create_InvalidBody(t *testing.T) {
	req := httptest.NewRequest("POST", "/tasks", bytes.NewBufferString("not json"))
	rr := httptest.NewRecorder()

	h := &TaskHandler{taskService: nil}
	h.Create(rr, req)

	if rr.Code != http.StatusBadRequest {
		t.Errorf("expected 400, got %d", rr.Code)
	}
}

func TestTaskHandler_Create_EmptyTitle(t *testing.T) {
	body := `{"title":""}`
	req := httptest.NewRequest("POST", "/tasks", bytes.NewBufferString(body))
	rr := httptest.NewRecorder()

	h := &TaskHandler{taskService: nil}
	h.Create(rr, req)

	if rr.Code != http.StatusBadRequest {
		t.Errorf("expected 400, got %d", rr.Code)
	}
}

// helper: add chi URL param to request
func withChiParam(r *http.Request, key, val string) *http.Request {
	rctx := chi.NewRouteContext()
	rctx.URLParams.Add(key, val)
	return r.WithContext(context.WithValue(r.Context(), chi.RouteCtxKey, rctx))
}

func TestTaskHandler_Get_NoChiParam(t *testing.T) {
	req := httptest.NewRequest("GET", "/tasks/1", nil)
	rr := httptest.NewRecorder()
	h := &TaskHandler{taskService: nil}
	h.Get(rr, req)
	if rr.Code != http.StatusBadRequest {
		t.Errorf("expected 400, got %d", rr.Code)
	}
}

func TestTaskHandler_Get_InvalidID(t *testing.T) {
	req := httptest.NewRequest("GET", "/tasks/abc", nil)
	req = withChiParam(req, "id", "abc")
	rr := httptest.NewRecorder()
	h := &TaskHandler{taskService: nil}
	h.Get(rr, req)
	if rr.Code != http.StatusBadRequest {
		t.Errorf("expected 400, got %d", rr.Code)
	}
}

func TestTaskHandler_Update_NoChiParam(t *testing.T) {
	req := httptest.NewRequest("PUT", "/tasks/1", bytes.NewBufferString("{}"))
	rr := httptest.NewRecorder()
	h := &TaskHandler{taskService: nil}
	h.Update(rr, req)
	if rr.Code != http.StatusBadRequest {
		t.Errorf("expected 400, got %d", rr.Code)
	}
}

func TestTaskHandler_Update_InvalidBody(t *testing.T) {
	req := httptest.NewRequest("PUT", "/tasks/1", bytes.NewBufferString("bad json"))
	req = withChiParam(req, "id", "1")
	rr := httptest.NewRecorder()
	h := &TaskHandler{taskService: nil}
	h.Update(rr, req)
	if rr.Code != http.StatusBadRequest {
		t.Errorf("expected 400, got %d", rr.Code)
	}
}

func TestTaskHandler_Delete_NoChiParam(t *testing.T) {
	req := httptest.NewRequest("DELETE", "/tasks/1", nil)
	rr := httptest.NewRecorder()
	h := &TaskHandler{taskService: nil}
	h.Delete(rr, req)
	if rr.Code != http.StatusBadRequest {
		t.Errorf("expected 400, got %d", rr.Code)
	}
}

func TestTaskHandler_Delete_InvalidID(t *testing.T) {
	req := httptest.NewRequest("DELETE", "/tasks/abc", nil)
	req = withChiParam(req, "id", "abc")
	rr := httptest.NewRecorder()
	h := &TaskHandler{taskService: nil}
	h.Delete(rr, req)
	if rr.Code != http.StatusBadRequest {
		t.Errorf("expected 400, got %d", rr.Code)
	}
}

func TestTaskHandler_Complete_NoChiParam(t *testing.T) {
	req := httptest.NewRequest("POST", "/tasks/1/complete", nil)
	rr := httptest.NewRecorder()
	h := &TaskHandler{taskService: nil}
	h.Complete(rr, req)
	if rr.Code != http.StatusBadRequest {
		t.Errorf("expected 400, got %d", rr.Code)
	}
}

func TestTaskHandler_Complete_InvalidID(t *testing.T) {
	req := httptest.NewRequest("POST", "/tasks/abc/complete", nil)
	req = withChiParam(req, "id", "abc")
	rr := httptest.NewRecorder()
	h := &TaskHandler{taskService: nil}
	h.Complete(rr, req)
	if rr.Code != http.StatusBadRequest {
		t.Errorf("expected 400, got %d", rr.Code)
	}
}

func TestTaskHandler_Uncomplete_NoChiParam(t *testing.T) {
	req := httptest.NewRequest("POST", "/tasks/1/uncomplete", nil)
	rr := httptest.NewRecorder()
	h := &TaskHandler{taskService: nil}
	h.Uncomplete(rr, req)
	if rr.Code != http.StatusBadRequest {
		t.Errorf("expected 400, got %d", rr.Code)
	}
}

func TestTaskHandler_Uncomplete_InvalidID(t *testing.T) {
	req := httptest.NewRequest("POST", "/tasks/abc/uncomplete", nil)
	req = withChiParam(req, "id", "abc")
	rr := httptest.NewRecorder()
	h := &TaskHandler{taskService: nil}
	h.Uncomplete(rr, req)
	if rr.Code != http.StatusBadRequest {
		t.Errorf("expected 400, got %d", rr.Code)
	}
}