package server

import (
	"context"
	"strings"
	"testing"
	"time"

	"scm.bstein.dev/bstein/soteria/internal/api"
	"scm.bstein.dev/bstein/soteria/internal/config"
)

func TestListPoliciesSortsByNamespacePVCAndID(t *testing.T) {
	srv := &Server{
		policies: map[string]api.BackupPolicy{
			"ops__db":       {ID: "ops__db", Namespace: "ops", PVC: "db"},
			"apps__cache":   {ID: "apps__cache", Namespace: "apps", PVC: "cache"},
			"apps__all":     {ID: "apps__all", Namespace: "apps", PVC: ""},
			"apps__z-extra": {ID: "apps__z-extra", Namespace: "apps", PVC: "z-extra"},
		},
	}

	policies := srv.listPolicies()
	if len(policies) != 4 {
		t.Fatalf("expected four policies, got %#v", policies)
	}
	gotOrder := []string{policies[0].ID, policies[1].ID, policies[2].ID, policies[3].ID}
	wantOrder := []string{"apps__all", "apps__cache", "apps__z-extra", "ops__db"}
	for i := range wantOrder {
		if gotOrder[i] != wantOrder[i] {
			t.Fatalf("expected sorted order %v, got %v", wantOrder, gotOrder)
		}
	}
}

func TestUpsertPolicyAppliesDefaultsAndPreservesCreatedAt(t *testing.T) {
	srv := newPolicyHandlerServer(&policyTestKubeClient{fakeKubeClient: &fakeKubeClient{}})

	created, err := srv.upsertPolicy(context.Background(), api.BackupPolicyUpsertRequest{
		Namespace:     "apps",
		PVC:           "data",
		IntervalHours: 0,
	})
	if err != nil {
		t.Fatalf("upsertPolicy create: %v", err)
	}
	if created.IntervalHours != defaultPolicyHours {
		t.Fatalf("expected default interval %.0f, got %#v", defaultPolicyHours, created)
	}
	if !created.Dedupe || created.KeepLast != 0 || !created.Enabled {
		t.Fatalf("expected default dedupe/keep_last/enabled values, got %#v", created)
	}
	if created.CreatedAt == "" || created.UpdatedAt == "" {
		t.Fatalf("expected timestamps to be populated, got %#v", created)
	}

	disabled := false
	dedupe := false
	keepLast := 4
	updated, err := srv.upsertPolicy(context.Background(), api.BackupPolicyUpsertRequest{
		Namespace:     "apps",
		PVC:           "data",
		IntervalHours: 12,
		Enabled:       &disabled,
		Dedupe:        &dedupe,
		KeepLast:      &keepLast,
	})
	if err != nil {
		t.Fatalf("upsertPolicy update: %v", err)
	}
	if updated.CreatedAt != created.CreatedAt {
		t.Fatalf("expected CreatedAt to be preserved, create=%q update=%q", created.CreatedAt, updated.CreatedAt)
	}
	if updated.IntervalHours != 12 || updated.Enabled || updated.Dedupe || updated.KeepLast != 4 {
		t.Fatalf("expected updated policy values to stick, got %#v", updated)
	}
}

func TestUpsertPolicyRejectsInvalidInputs(t *testing.T) {
	srv := newPolicyHandlerServer(&policyTestKubeClient{fakeKubeClient: &fakeKubeClient{}})

	testCases := []struct {
		name string
		req  api.BackupPolicyUpsertRequest
		want string
	}{
		{
			name: "invalid namespace",
			req:  api.BackupPolicyUpsertRequest{Namespace: "Apps", IntervalHours: 1},
			want: "namespace must be a valid Kubernetes DNS-1123 label",
		},
		{
			name: "invalid pvc",
			req:  api.BackupPolicyUpsertRequest{Namespace: "apps", PVC: "Bad_PVC", IntervalHours: 1},
			want: "pvc must be a valid Kubernetes DNS-1123 label",
		},
		{
			name: "interval too high",
			req:  api.BackupPolicyUpsertRequest{Namespace: "apps", IntervalHours: maxPolicyIntervalHrs + 1},
			want: "interval_hours must be <=",
		},
		{
			name: "negative keep last",
			req:  api.BackupPolicyUpsertRequest{Namespace: "apps", IntervalHours: 1, KeepLast: intPtr(-1)},
			want: "keep_last must be >=",
		},
	}

	for _, tc := range testCases {
		if _, err := srv.upsertPolicy(context.Background(), tc.req); err == nil || !strings.Contains(err.Error(), tc.want) {
			t.Fatalf("%s: expected error containing %q, got %v", tc.name, tc.want, err)
		}
	}
}

func TestDeletePolicyHandlesEmptyMissingAndSuccess(t *testing.T) {
	srv := &Server{
		policies: map[string]api.BackupPolicy{
			"apps__data": {ID: "apps__data", Namespace: "apps", PVC: "data"},
		},
	}

	removed, err := srv.deletePolicy(context.Background(), "")
	if err != nil || removed {
		t.Fatalf("expected empty id delete to no-op, removed=%v err=%v", removed, err)
	}

	removed, err = srv.deletePolicy(context.Background(), "missing")
	if err != nil || removed {
		t.Fatalf("expected missing id delete to no-op, removed=%v err=%v", removed, err)
	}

	srv.client = &policyTestKubeClient{fakeKubeClient: &fakeKubeClient{}}
	srv.cfg = &config.Config{Namespace: "maintenance", PolicySecretName: "soteria-policies"}
	removed, err = srv.deletePolicy(context.Background(), "apps__data")
	if err != nil || !removed {
		t.Fatalf("expected existing id delete to succeed, removed=%v err=%v", removed, err)
	}
}

func TestPolicySliceFromMapAndBackupDueHelpers(t *testing.T) {
	slice := policySliceFromMap(map[string]api.BackupPolicy{
		"b": {ID: "b"},
		"a": {ID: "a"},
	})
	if len(slice) != 2 || slice[0].ID != "a" || slice[1].ID != "b" {
		t.Fatalf("expected sorted policy slice by id, got %#v", slice)
	}

	if !backupDue("", 1) {
		t.Fatalf("expected empty backup timestamp to be due")
	}
	if !backupDue("not-a-time", 1) {
		t.Fatalf("expected invalid backup timestamp to be due")
	}
	if !backupDue(time.Now().UTC().Add(-48*time.Hour).Format(time.RFC3339), 1) {
		t.Fatalf("expected old backup timestamp to be due")
	}
	if backupDue(time.Now().UTC().Add(-30*time.Minute).Format(time.RFC3339), 2) {
		t.Fatalf("expected recent backup timestamp to not be due")
	}
	if backupDue(time.Now().UTC().Add(-30*time.Minute).Format(time.RFC3339), 0) {
		t.Fatalf("expected default interval fallback to keep recent backup not due")
	}
}

func TestLoadPoliciesRejectsInvalidDocuments(t *testing.T) {
	srv := &Server{
		cfg: &config.Config{
			Namespace:        "maintenance",
			PolicySecretName: "soteria-policies",
		},
		client: &fakeKubeClient{
			secretData: map[string][]byte{
				policySecretKey: []byte(`{"policies":[`),
			},
		},
		policies: map[string]api.BackupPolicy{},
	}

	err := srv.loadPolicies(context.Background())
	if err == nil || !strings.Contains(err.Error(), "decode policy document") {
		t.Fatalf("expected invalid document error, got %v", err)
	}
}