package routes

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

	"github.com/grafana/grafana-plugin-sdk-go/backend"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/mock"

	"github.com/grafana/grafana/pkg/tsdb/cloudwatch/mocks"
	"github.com/grafana/grafana/pkg/tsdb/cloudwatch/models"
	"github.com/grafana/grafana/pkg/tsdb/cloudwatch/models/resources"
)

func TestLogGroupFieldsRoute(t *testing.T) {
	reqCtxFunc := func(_ context.Context, pluginCtx backend.PluginContext, region string) (reqCtx models.RequestContext, err error) {
		return models.RequestContext{}, err
	}
	t.Run("returns 400 if an invalid LogGroupFieldsRequest is used", func(t *testing.T) {
		rr := httptest.NewRecorder()
		req := httptest.NewRequest("GET", `/log-group-fields?region=us-east-2`, nil)
		handler := http.HandlerFunc(ResourceRequestMiddleware(LogGroupFieldsHandler, logger, nil))
		handler.ServeHTTP(rr, req)
		assert.Equal(t, http.StatusBadRequest, rr.Code)
		assert.Equal(t, `{"Message":"error in LogGroupFieldsHandler: you need to specify either logGroupName or logGroupArn","Error":"you need to specify either logGroupName or logGroupArn","StatusCode":400}`, rr.Body.String())
	})

	t.Run("returns 500 if GetLogGroupFields method fails", func(t *testing.T) {
		mockLogsService := mocks.LogsService{}
		mockLogsService.On("GetLogGroupFieldsWithContext", mock.Anything).Return([]resources.ResourceResponse[resources.LogGroupField]{}, fmt.Errorf("error from api"))
		newLogGroupsService = func(_ context.Context, pluginCtx backend.PluginContext, reqCtxFactory models.RequestContextFactoryFunc, region string) (models.LogGroupsProvider, error) {
			return &mockLogsService, nil
		}

		rr := httptest.NewRecorder()
		req := httptest.NewRequest("GET", "/log-group-fields?region=us-east-2&logGroupName=test", nil)
		handler := http.HandlerFunc(ResourceRequestMiddleware(LogGroupFieldsHandler, logger, reqCtxFunc))
		handler.ServeHTTP(rr, req)

		assert.Equal(t, http.StatusInternalServerError, rr.Code)
		assert.Equal(t, `{"Message":"GetLogGroupFields error: error from api","Error":"error from api","StatusCode":500}`, rr.Body.String())
	})

	t.Run("returns valid json response if everything is ok", func(t *testing.T) {
		mockLogsService := mocks.LogsService{}
		mockLogsService.On("GetLogGroupFieldsWithContext", mock.Anything).Return([]resources.ResourceResponse[resources.LogGroupField]{
			{
				AccountId: new(string),
				Value: resources.LogGroupField{
					Name:    "field1",
					Percent: 50,
				},
			},
			{
				AccountId: new(string),
				Value: resources.LogGroupField{
					Name:    "field2",
					Percent: 50,
				},
			},
		}, nil)
		newLogGroupsService = func(_ context.Context, pluginCtx backend.PluginContext, reqCtxFactory models.RequestContextFactoryFunc, region string) (models.LogGroupsProvider, error) {
			return &mockLogsService, nil
		}

		rr := httptest.NewRecorder()
		req := httptest.NewRequest("GET", "/log-group-fields?region=us-east-2&logGroupName=test", nil)
		handler := http.HandlerFunc(ResourceRequestMiddleware(LogGroupFieldsHandler, logger, reqCtxFunc))
		handler.ServeHTTP(rr, req)

		assert.Equal(t, http.StatusOK, rr.Code)
		assert.JSONEq(t, `[{"accountId":"","value":{"name":"field1","percent":50}},{"accountId":"","value":{"name":"field2","percent":50}}]`, rr.Body.String())
	})
}