package app

import (
	"strings"
	"testing"
	"time"

	"gitea.maximumdirect.net/eric/distributor/internal/config"
	"gitea.maximumdirect.net/eric/distributor/internal/state"
	"gitea.maximumdirect.net/eric/distributor/internal/testutil"
)

func TestPlanPruneDisabledPolicy(t *testing.T) {
	document := state.StateDocument{SingleOwner: &state.DistributorState{}}
	report, err := PlanPrune(document, config.PrunePolicy{}, PrunePlanOptions{
		PipelineID:    "reports",
		DestinationID: "archive",
	})
	if err != nil {
		t.Fatalf("PlanPrune() error = %v", err)
	}
	if report.Enabled || report.CheckedCount != 0 || len(report.PrunedOutputs) != 0 {
		t.Fatalf("report = %#v, want disabled empty plan", report)
	}
}

func TestPlanPruneSingleOwnerOutputs(t *testing.T) {
	now := time.Date(2026, 6, 8, 12, 0, 0, 0, time.UTC)
	olderThan := config.Duration(48 * time.Hour)
	destinationState := pruneSingleOwnerState(now)

	report, err := PlanPrune(state.StateDocument{SingleOwner: &destinationState}, config.PrunePolicy{
		Enabled:   true,
		OlderThan: &olderThan,
	}, PrunePlanOptions{
		PipelineID:    "reports",
		DestinationID: "archive",
		Now:           now,
	})
	if err != nil {
		t.Fatalf("PlanPrune() error = %v", err)
	}
	if got, want := pruneRecordPaths(report.PrunedOutputs), "old.txt"; got != want {
		t.Fatalf("pruned = %q, want %q", got, want)
	}
	if got, want := pruneRecordPaths(report.PreservedOutputs), "fresh.txt"; got != want {
		t.Fatalf("preserved = %q, want %q", got, want)
	}
}

func TestPlanPruneSharedRootCurrentOwnerOnly(t *testing.T) {
	now := time.Date(2026, 6, 8, 12, 0, 0, 0, time.UTC)
	keepLatest := 0
	sharedRoot := pruneSharedRootState(now)

	report, err := PlanPrune(state.StateDocument{SharedRoot: &sharedRoot}, config.PrunePolicy{
		Enabled:    true,
		KeepLatest: &keepLatest,
	}, PrunePlanOptions{
		PipelineID:    "reports",
		DestinationID: "archive",
		Now:           now,
	})
	if err != nil {
		t.Fatalf("PlanPrune() error = %v", err)
	}
	if got, want := report.CheckedCount, 1; got != want {
		t.Fatalf("checked count = %d, want %d", got, want)
	}
	if got, want := pruneRecordPaths(report.PrunedOutputs), "archive.txt"; got != want {
		t.Fatalf("pruned = %q, want %q", got, want)
	}
}

func pruneSingleOwnerState(now time.Time) state.DistributorState {
	manifest := testutil.ValidManifest(testutil.BundleOptions{})
	publishedAt := now.Add(-96 * time.Hour)
	return state.DistributorState{
		SchemaVersion:      state.SchemaVersion,
		PipelineID:         "reports",
		DestinationID:      "archive",
		PublishedAt:        publishedAt,
		CreatedAt:          publishedAt,
		UpdatedAt:          publishedAt,
		State:              state.StatePolicy{Mode: state.StateModeSingleOwner},
		Reconciliation:     state.ReconciliationPolicy{Mode: config.ReconciliationModeReplace},
		Source:             state.SourceState{Manifest: manifest},
		DistributorVersion: "test",
		Outputs: []state.OutputFile{{
			Path:       "old.txt",
			Kind:       state.OutputKindSource,
			SourcePath: "report.md",
			SHA256:     manifest.Files[0].SHA256,
			Size:       manifest.Files[0].Size,
			CreatedAt:  now.Add(-96 * time.Hour),
			UpdatedAt:  now.Add(-72 * time.Hour),
		}, {
			Path:       "fresh.txt",
			Kind:       state.OutputKindSource,
			SourcePath: "summary.txt",
			SHA256:     manifest.Files[1].SHA256,
			Size:       manifest.Files[1].Size,
			CreatedAt:  now.Add(-24 * time.Hour),
			UpdatedAt:  now.Add(-24 * time.Hour),
		}},
	}
}

func pruneSharedRootState(now time.Time) state.SharedRootState {
	manifest := testutil.ValidManifest(testutil.BundleOptions{})
	archive := state.CurrentOwnerScope("reports", "archive")
	html := state.CurrentOwnerScope("reports", "html")
	return state.SharedRootState{
		SchemaVersion:      state.SharedRootSchemaVersion,
		DistributorVersion: "test",
		CreatedAt:          now.Add(-96 * time.Hour),
		UpdatedAt:          now.Add(-24 * time.Hour),
		State:              state.StatePolicy{Mode: state.StateModeSharedRoot},
		Owners: []state.OwnerRecord{{
			Scope:          archive,
			Reconciliation: state.ReconciliationPolicy{Mode: config.ReconciliationModeReplace},
			Source:         state.SourceState{Manifest: manifest},
		}, {
			Scope:          html,
			Reconciliation: state.ReconciliationPolicy{Mode: config.ReconciliationModeReplace},
			Source:         state.SourceState{Manifest: manifest},
		}},
		Outputs: []state.SharedRootOutputFile{{
			Path:          "archive.txt",
			Kind:          state.OutputKindSource,
			SourcePath:    "report.md",
			SHA256:        manifest.Files[0].SHA256,
			Size:          manifest.Files[0].Size,
			Owner:         archive,
			SourceID:      manifest.ID,
			SourceDigest:  manifest.Digest,
			SourceCreated: manifest.Created,
			CreatedAt:     now.Add(-96 * time.Hour),
			UpdatedAt:     now.Add(-72 * time.Hour),
		}, {
			Path:          "html.txt",
			Kind:          state.OutputKindSource,
			SourcePath:    "summary.txt",
			SHA256:        manifest.Files[1].SHA256,
			Size:          manifest.Files[1].Size,
			Owner:         html,
			SourceID:      manifest.ID,
			SourceDigest:  manifest.Digest,
			SourceCreated: manifest.Created,
			CreatedAt:     now.Add(-96 * time.Hour),
			UpdatedAt:     now.Add(-72 * time.Hour),
		}},
	}
}

func pruneRecordPaths(records []PruneOutputRecord) string {
	paths := make([]string, 0, len(records))
	for _, record := range records {
		paths = append(paths, record.Path)
	}
	return strings.Join(paths, ",")
}