package cmd

import (
	"testing"

	api "github.com/linkerd/linkerd2/viz/metrics-api"
)

type edgesParamsExp struct {
	options      *edgesOptions
	resourceType string
	file         string
}

func TestEdges(t *testing.T) {
	options := newEdgesOptions()
	options.outputFormat = tableOutput
	options.allNamespaces = true
	t.Run("Returns edges", func(t *testing.T) {
		testEdgesCall(edgesParamsExp{
			options:      options,
			resourceType: "deployment",
			file:         "edges_one_output.golden",
		}, t)
	})

	options.outputFormat = jsonOutput
	t.Run("Returns edges (json)", func(t *testing.T) {
		testEdgesCall(edgesParamsExp{
			options:      options,
			resourceType: "deployment",
			file:         "edges_one_output_json.golden",
		}, t)
	})

	t.Run("Returns edges (wide)", func(t *testing.T) {
		options.outputFormat = wideOutput
		testEdgesCall(edgesParamsExp{
			options:      options,
			resourceType: "deployment",
			file:         "edges_wide_output.golden",
		}, t)
	})

	t.Run("Returns an error if outputFormat specified is not wide, table or json", func(t *testing.T) {
		options.outputFormat = "test"
		args := []string{"deployment"}
		expectedError := "--output supports table, json and wide"

		_, err := buildEdgesRequests(args, options)
		if err == nil || err.Error() != expectedError {
			t.Fatalf("Expected error [%s] instead got [%s]", expectedError, err)
		}
	})

	t.Run("Returns an error if request includes the resource name", func(t *testing.T) {
		options.outputFormat = tableOutput
		args := []string{"pod/pod-name"}
		expectedError := "Edges cannot be returned for a specific resource name; remove pod-name from query"

		_, err := buildEdgesRequests(args, options)
		if err == nil || err.Error() != expectedError {
			t.Fatalf("Expected error [%s] instead got [%s]", expectedError, err)
		}
	})

	t.Run("Returns an error if request is for authority", func(t *testing.T) {
		options.outputFormat = tableOutput
		args := []string{"authority"}
		expectedError := "Resource type is not supported: authority"

		_, err := buildEdgesRequests(args, options)
		if err == nil || err.Error() != expectedError {
			t.Fatalf("Expected error [%s] instead got [%s]", expectedError, err)
		}
	})

	t.Run("Returns an error if request is for service", func(t *testing.T) {
		options.outputFormat = tableOutput
		args := []string{"service"}
		expectedError := "Resource type is not supported: service"

		_, err := buildEdgesRequests(args, options)
		if err == nil || err.Error() != expectedError {
			t.Fatalf("Expected error [%s] instead got [%s]", expectedError, err)
		}
	})

	t.Run("Returns an error if request is for all resource types", func(t *testing.T) {
		options.outputFormat = tableOutput
		args := []string{"all"}
		expectedError := "Resource type is not supported: all"

		_, err := buildEdgesRequests(args, options)
		if err == nil || err.Error() != expectedError {
			t.Fatalf("Expected error [%s] instead got [%s]", expectedError, err)
		}
	})
}

func testEdgesCall(exp edgesParamsExp, t *testing.T) {
	mockClient := &api.MockAPIClient{}
	response := api.GenEdgesResponse(exp.resourceType, "all")

	mockClient.EdgesResponseToReturn = response

	args := []string{"deployment"}
	reqs, err := buildEdgesRequests(args, exp.options)
	if err != nil {
		t.Fatalf("Unexpected error: %v", err)
	}

	resp, err := requestEdgesFromAPI(mockClient, reqs[0])
	if err != nil {
		t.Fatalf("Unexpected error: %v", err)
	}

	rows := edgesRespToRows(resp)
	output := renderEdgeStats(rows, exp.options)

	testDataDiffer.DiffTestdata(t, exp.file, output)
}