package apply

import (
	"fmt"
	"os"
	"path/filepath"
	"strings"
	"testing"

	policyreportv1alpha2 "github.com/kyverno/kyverno/api/policyreport/v1alpha2"
	"github.com/kyverno/kyverno/cmd/cli/kubectl-kyverno/report"
	"gotest.tools/assert"
)

func Test_Apply(t *testing.T) {
	type TestCase struct {
		gitBranch             string
		expectedPolicyReports []policyreportv1alpha2.PolicyReport
		config                ApplyCommandConfig
		stdinFile             string
	}
	// copy disallow_latest_tag.yaml to local path
	localFileName, err := copyFileToThisDir("../../../../../test/best_practices/disallow_latest_tag.yaml")
	assert.NilError(t, err)
	defer func() { _ = os.Remove(localFileName) }()

	testcases := []*TestCase{
		{
			config: ApplyCommandConfig{
				PolicyPaths:   []string{"../../../../../test/best_practices/disallow_latest_tag.yaml"},
				ResourcePaths: []string{"../../../../../test/resources/pod_with_version_tag.yaml"},
				PolicyReport:  true,
			},
			expectedPolicyReports: []policyreportv1alpha2.PolicyReport{{
				Summary: policyreportv1alpha2.PolicyReportSummary{
					Pass:  2,
					Fail:  0,
					Skip:  0,
					Error: 0,
					Warn:  0,
				},
			}},
		},
		{
			config: ApplyCommandConfig{
				PolicyPaths:   []string{localFileName},
				ResourcePaths: []string{"../../../../../test/resources/pod_with_version_tag.yaml"},
				PolicyReport:  true,
			},
			expectedPolicyReports: []policyreportv1alpha2.PolicyReport{{
				Summary: policyreportv1alpha2.PolicyReportSummary{
					Pass:  2,
					Fail:  0,
					Skip:  0,
					Error: 0,
					Warn:  0,
				},
			}},
		},
		{
			config: ApplyCommandConfig{
				PolicyPaths:   []string{"../../../../../test/best_practices/disallow_latest_tag.yaml"},
				ResourcePaths: []string{"../../../../../test/resources/pod_with_latest_tag.yaml"},
				PolicyReport:  true,
			},
			expectedPolicyReports: []policyreportv1alpha2.PolicyReport{{
				Summary: policyreportv1alpha2.PolicyReportSummary{
					Pass:  1,
					Fail:  1,
					Skip:  0,
					Error: 0,
					Warn:  0,
				},
			}},
		},
		{
			config: ApplyCommandConfig{
				PolicyPaths:   []string{"../../../../../test/cli/apply/policies"},
				ResourcePaths: []string{"../../../../../test/cli/apply/resource"},
				PolicyReport:  true,
			},
			expectedPolicyReports: []policyreportv1alpha2.PolicyReport{{
				Summary: policyreportv1alpha2.PolicyReportSummary{
					Pass:  1,
					Fail:  1,
					Skip:  0,
					Error: 0,
					Warn:  2,
				},
			}},
		},
		{
			config: ApplyCommandConfig{
				PolicyPaths:   []string{"../../../../../test/best_practices/disallow_latest_tag.yaml"},
				ResourcePaths: []string{"../../../../../test/resources/pod_with_latest_tag.yaml"},
				PolicyReport:  true,
				AuditWarn:     true,
			},
			expectedPolicyReports: []policyreportv1alpha2.PolicyReport{{
				Summary: policyreportv1alpha2.PolicyReportSummary{
					Pass:  1,
					Fail:  0,
					Skip:  0,
					Error: 0,
					Warn:  1,
				},
			}},
		},
		{
			config: ApplyCommandConfig{
				PolicyPaths:   []string{"-"},
				ResourcePaths: []string{"../../../../../test/resources/pod_with_latest_tag.yaml"},
				PolicyReport:  true,
				AuditWarn:     true,
			},
			stdinFile: "../../../../../test/best_practices/disallow_latest_tag.yaml",
			expectedPolicyReports: []policyreportv1alpha2.PolicyReport{{
				Summary: policyreportv1alpha2.PolicyReportSummary{
					Pass:  1,
					Fail:  0,
					Skip:  0,
					Error: 0,
					Warn:  1,
				},
			}},
		},
		{
			config: ApplyCommandConfig{
				PolicyPaths:   []string{"../../../../../test/best_practices/disallow_latest_tag.yaml"},
				ResourcePaths: []string{"-"},
				PolicyReport:  true,
				AuditWarn:     true,
			},
			stdinFile: "../../../../../test/resources/pod_with_latest_tag.yaml",
			expectedPolicyReports: []policyreportv1alpha2.PolicyReport{{
				Summary: policyreportv1alpha2.PolicyReportSummary{
					Pass:  1,
					Fail:  0,
					Skip:  0,
					Error: 0,
					Warn:  1,
				},
			}},
		},
		// {
		// 	// TODO
		// 	config: ApplyCommandConfig{
		// 		PolicyPaths:   []string{"https://github.com/kyverno/policies/openshift/team-validate-ns-name/"},
		// 		ResourcePaths: []string{"../../../../../test/openshift/team-validate-ns-name.yaml"},
		// 		GitBranch:     "main",
		// 		PolicyReport:  true,
		// 	},
		// 	expectedPolicyReports: []policyreportv1alpha2.PolicyReport{{
		// 		Summary: policyreportv1alpha2.PolicyReportSummary{
		// 			Pass:  2,
		// 			Fail:  0,
		// 			Skip:  0,
		// 			Error: 0,
		// 			Warn:  0,
		// 		},
		// 	}},
		// },
		{
			config: ApplyCommandConfig{
				PolicyPaths:   []string{"../../../../../test/cli/apply/policies-set"},
				ResourcePaths: []string{"../../../../../test/cli/apply/resources-set"},
				Variables:     []string{"request.operation=UPDATE"},
				PolicyReport:  true,
			},
			expectedPolicyReports: []policyreportv1alpha2.PolicyReport{{
				Summary: policyreportv1alpha2.PolicyReportSummary{
					Pass:  2,
					Fail:  0,
					Skip:  0,
					Error: 0,
					Warn:  0,
				},
			}},
		},
		{
			config: ApplyCommandConfig{
				PolicyPaths:   []string{"../../../../../test/cli/test-validating-admission-policy/check-deployments-replica/policy.yaml"},
				ResourcePaths: []string{"../../../../../test/cli/test-validating-admission-policy/check-deployments-replica/deployment1.yaml"},
				PolicyReport:  true,
			},
			expectedPolicyReports: []policyreportv1alpha2.PolicyReport{{
				Summary: policyreportv1alpha2.PolicyReportSummary{
					Pass:  1,
					Fail:  0,
					Skip:  0,
					Error: 0,
					Warn:  0,
				},
			}},
		},
		{
			config: ApplyCommandConfig{
				PolicyPaths:   []string{"../../../../../test/cli/test-validating-admission-policy/check-deployments-replica/policy.yaml"},
				ResourcePaths: []string{"../../../../../test/cli/test-validating-admission-policy/check-deployments-replica/deployment2.yaml"},
				PolicyReport:  true,
			},
			expectedPolicyReports: []policyreportv1alpha2.PolicyReport{{
				Summary: policyreportv1alpha2.PolicyReportSummary{
					Pass:  0,
					Fail:  1,
					Skip:  0,
					Error: 0,
					Warn:  0,
				},
			}},
		},
		{
			config: ApplyCommandConfig{
				PolicyPaths:   []string{"../../../../../test/cli/test-validating-admission-policy/disallow-host-path/policy.yaml"},
				ResourcePaths: []string{"../../../../../test/cli/test-validating-admission-policy/disallow-host-path/pod1.yaml"},
				PolicyReport:  true,
			},
			expectedPolicyReports: []policyreportv1alpha2.PolicyReport{{
				Summary: policyreportv1alpha2.PolicyReportSummary{
					Pass:  1,
					Fail:  0,
					Skip:  0,
					Error: 0,
					Warn:  0,
				},
			}},
		},
		{
			config: ApplyCommandConfig{
				PolicyPaths:   []string{"../../../../../test/cli/test-validating-admission-policy/disallow-host-path/policy.yaml"},
				ResourcePaths: []string{"../../../../../test/cli/test-validating-admission-policy/disallow-host-path/pod2.yaml"},
				PolicyReport:  true,
			},
			expectedPolicyReports: []policyreportv1alpha2.PolicyReport{{
				Summary: policyreportv1alpha2.PolicyReportSummary{
					Pass:  0,
					Fail:  1,
					Skip:  0,
					Error: 0,
					Warn:  0,
				},
			}},
		},
		{
			config: ApplyCommandConfig{
				PolicyPaths:   []string{"../../../../../test/cli/test-validating-admission-policy/check-deployment-labels/policy.yaml"},
				ResourcePaths: []string{"../../../../../test/cli/test-validating-admission-policy/check-deployment-labels/deployment1.yaml"},
				PolicyReport:  true,
			},
			expectedPolicyReports: []policyreportv1alpha2.PolicyReport{{
				Summary: policyreportv1alpha2.PolicyReportSummary{
					Pass:  1,
					Fail:  0,
					Skip:  0,
					Error: 0,
					Warn:  0,
				},
			}},
		},
		{
			config: ApplyCommandConfig{
				PolicyPaths:   []string{"../../../../../test/cli/test-validating-admission-policy/check-deployment-labels/policy.yaml"},
				ResourcePaths: []string{"../../../../../test/cli/test-validating-admission-policy/check-deployment-labels/deployment2.yaml"},
				PolicyReport:  true,
			},
			expectedPolicyReports: []policyreportv1alpha2.PolicyReport{{
				Summary: policyreportv1alpha2.PolicyReportSummary{
					Pass:  0,
					Fail:  1,
					Skip:  0,
					Error: 0,
					Warn:  0,
				},
			}},
		},
		{
			config: ApplyCommandConfig{
				PolicyPaths:   []string{"https://github.com/kyverno/policies/best-practices/require-labels/", "../../../../../test/best_practices/disallow_latest_tag.yaml"},
				ResourcePaths: []string{"../../../../../test/resources/pod_with_version_tag.yaml"},
				GitBranch:     "main",
				PolicyReport:  true,
			},
			expectedPolicyReports: []policyreportv1alpha2.PolicyReport{{
				Summary: policyreportv1alpha2.PolicyReportSummary{
					Pass:  2,
					Fail:  1,
					Skip:  0,
					Error: 0,
					Warn:  0,
				},
			}},
		},
		{
			// Same as the above test case but the policy paths are reordered
			config: ApplyCommandConfig{
				PolicyPaths:   []string{"../../../../../test/best_practices/disallow_latest_tag.yaml", "https://github.com/kyverno/policies/best-practices/require-labels/"},
				ResourcePaths: []string{"../../../../../test/resources/pod_with_version_tag.yaml"},
				GitBranch:     "main",
				PolicyReport:  true,
			},
			expectedPolicyReports: []policyreportv1alpha2.PolicyReport{{
				Summary: policyreportv1alpha2.PolicyReportSummary{
					Pass:  2,
					Fail:  1,
					Skip:  0,
					Error: 0,
					Warn:  0,
				},
			}},
		},
	}

	compareSummary := func(expected policyreportv1alpha2.PolicyReportSummary, actual policyreportv1alpha2.PolicyReportSummary, desc string) {
		assert.Equal(t, actual.Pass, expected.Pass, desc)
		assert.Equal(t, actual.Fail, expected.Fail, desc)
		assert.Equal(t, actual.Skip, expected.Skip, desc)
		assert.Equal(t, actual.Warn, expected.Warn, desc)
		assert.Equal(t, actual.Error, expected.Error, desc)
	}

	verifyTestcase := func(t *testing.T, tc *TestCase, compareSummary func(policyreportv1alpha2.PolicyReportSummary, policyreportv1alpha2.PolicyReportSummary, string)) {
		if tc.stdinFile != "" {
			oldStdin := os.Stdin
			input, err := os.OpenFile(tc.stdinFile, os.O_RDONLY, 0)
			assert.NilError(t, err)
			os.Stdin = input
			defer func() {
				// Restore original Stdin
				os.Stdin = oldStdin
				_ = input.Close()
			}()
		}
		desc := fmt.Sprintf("Policies: [%s], / Resources: [%s]", strings.Join(tc.config.PolicyPaths, ","), strings.Join(tc.config.ResourcePaths, ","))

		_, _, _, responses, err := tc.config.applyCommandHelper()
		assert.NilError(t, err, desc)

		clustered, _ := report.ComputePolicyReports(tc.config.AuditWarn, responses...)
		assert.Assert(t, len(clustered) > 0, "policy reports should not be empty: %s", desc)
		combined := []policyreportv1alpha2.ClusterPolicyReport{
			report.MergeClusterReports(clustered),
		}
		assert.Equal(t, len(combined), len(tc.expectedPolicyReports))
		for i, resp := range combined {
			compareSummary(tc.expectedPolicyReports[i].Summary, resp.Summary, desc)
		}
	}

	for _, tc := range testcases {
		t.Run("", func(t *testing.T) {
			verifyTestcase(t, tc, compareSummary)
		})
	}
}

func copyFileToThisDir(sourceFile string) (string, error) {
	input, err := os.ReadFile(sourceFile)
	if err != nil {
		return "", err
	}

	return filepath.Base(sourceFile), os.WriteFile(filepath.Base(sourceFile), input, 0o644)
}