package vaultik

import (
	"testing"
	"time"
)

func TestParseSnapshotName(t *testing.T) {
	tests := []struct {
		name       string
		snapshotID string
		want       string
	}{
		{
			name:       "standard format with name",
			snapshotID: "myhost_home_2026-01-12T14:41:15Z",
			want:       "home",
		},
		{
			name:       "standard format with different name",
			snapshotID: "server1_system_2026-02-15T09:30:00Z",
			want:       "system",
		},
		{
			name:       "name with underscores",
			snapshotID: "myhost_my_special_backup_2026-03-01T00:00:00Z",
			want:       "my_special_backup",
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			got := parseSnapshotName(tt.snapshotID)
			if got != tt.want {
				t.Errorf("parseSnapshotName(%q) = %q, want %q", tt.snapshotID, got, tt.want)
			}
		})
	}
}

func TestParseDuration(t *testing.T) {
	tests := []struct {
		input string
		want  time.Duration
		err   bool
	}{
		{"30d", 30 * 24 * time.Hour, false},
		{"4w", 4 * 7 * 24 * time.Hour, false},
		{"6mo", 6 * 30 * 24 * time.Hour, false},
		{"1y", 365 * 24 * time.Hour, false},
		{"2w3d", 2*7*24*time.Hour + 3*24*time.Hour, false},
		{"1h", time.Hour, false},
		{"30s", 30 * time.Second, false},
		{"garbage", 0, true},
	}

	for _, tt := range tests {
		t.Run(tt.input, func(t *testing.T) {
			got, err := parseDuration(tt.input)
			if tt.err {
				if err == nil {
					t.Fatalf("expected error for %q, got %v", tt.input, got)
				}
				return
			}
			if err != nil {
				t.Fatalf("unexpected error for %q: %v", tt.input, err)
			}
			if got != tt.want {
				t.Errorf("parseDuration(%q) = %v, want %v", tt.input, got, tt.want)
			}
		})
	}
}

func TestParseSnapshotTimestamp(t *testing.T) {
	tests := []struct {
		name       string
		snapshotID string
		wantErr    bool
	}{
		{
			name:       "valid with name",
			snapshotID: "myhost_home_2026-01-12T14:41:15Z",
			wantErr:    false,
		},
		{
			name:       "valid without name",
			snapshotID: "myhost_2026-01-12T14:41:15Z",
			wantErr:    false,
		},
		{
			name:       "invalid - single part",
			snapshotID: "nounderscore",
			wantErr:    true,
		},
		{
			name:       "invalid - bad timestamp",
			snapshotID: "myhost_home_notadate",
			wantErr:    true,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			_, err := parseSnapshotTimestamp(tt.snapshotID)
			if (err != nil) != tt.wantErr {
				t.Errorf("parseSnapshotTimestamp(%q) error = %v, wantErr %v", tt.snapshotID, err, tt.wantErr)
			}
		})
	}
}