package client

import (
	"bytes"
	"context"
	"encoding/json"
	"fmt"
	"io"
	"net/http"
	"strings"
	"testing"

	cerrdefs "github.com/containerd/errdefs"
	"github.com/docker/docker/api/types/container"
	"gotest.tools/v3/assert"
	is "gotest.tools/v3/assert/cmp"
)

func TestContainerTopError(t *testing.T) {
	client := &Client{
		client: newMockClient(errorMock(http.StatusInternalServerError, "Server error")),
	}
	_, err := client.ContainerTop(context.Background(), "nothing", []string{})
	assert.Check(t, is.ErrorType(err, cerrdefs.IsInternal))

	_, err = client.ContainerTop(context.Background(), "", []string{})
	assert.Check(t, is.ErrorType(err, cerrdefs.IsInvalidArgument))
	assert.Check(t, is.ErrorContains(err, "value is empty"))

	_, err = client.ContainerTop(context.Background(), "    ", []string{})
	assert.Check(t, is.ErrorType(err, cerrdefs.IsInvalidArgument))
	assert.Check(t, is.ErrorContains(err, "value is empty"))
}

func TestContainerTop(t *testing.T) {
	expectedURL := "/containers/container_id/top"
	expectedProcesses := [][]string{
		{"p1", "p2"},
		{"p3"},
	}
	expectedTitles := []string{"title1", "title2"}

	client := &Client{
		client: newMockClient(func(req *http.Request) (*http.Response, error) {
			if !strings.HasPrefix(req.URL.Path, expectedURL) {
				return nil, fmt.Errorf("Expected URL '%s', got '%s'", expectedURL, req.URL)
			}
			query := req.URL.Query()
			args := query.Get("ps_args")
			if args != "arg1 arg2" {
				return nil, fmt.Errorf("args not set in URL query properly. Expected 'arg1 arg2', got %v", args)
			}

			b, err := json.Marshal(container.TopResponse{
				Processes: [][]string{
					{"p1", "p2"},
					{"p3"},
				},
				Titles: []string{"title1", "title2"},
			})
			if err != nil {
				return nil, err
			}

			return &http.Response{
				StatusCode: http.StatusOK,
				Body:       io.NopCloser(bytes.NewReader(b)),
			}, nil
		}),
	}

	processList, err := client.ContainerTop(context.Background(), "container_id", []string{"arg1", "arg2"})
	assert.NilError(t, err)
	assert.Check(t, is.DeepEqual(expectedProcesses, processList.Processes))
	assert.Check(t, is.DeepEqual(expectedTitles, processList.Titles))
}
