package backup

import (
	"slices"
	"strings"
	"testing"
)

func everyListedTable() []string {
	var names []string
	for _, t := range Tables {
		names = append(names, t.Name)
	}
	for name := range Excluded {
		names = append(names, name)
	}
	return names
}

func TestCoverageAcceptsASchemaThatMatchesTheLists(t *testing.T) {
	if problems := Coverage(everyListedTable()); len(problems) != 0 {
		t.Fatalf("problems = %v, want none", problems)
	}
}

func TestCoverageNamesATableInNeitherList(t *testing.T) {
	problems := Coverage(append(everyListedTable(), "new_table"))
	if len(problems) != 1 || !strings.HasPrefix(problems[0], "new_table: neither") {
		t.Fatalf("problems = %v, want one naming new_table", problems)
	}
}

func TestCoverageNamesAListedTableTheSchemaLacks(t *testing.T) {
	schema := slices.DeleteFunc(everyListedTable(), func(n string) bool { return n == "playlists" || n == "scan_runs" })
	problems := Coverage(schema)
	if len(problems) != 2 {
		t.Fatalf("problems = %v, want playlists and scan_runs named", problems)
	}
}

func TestEveryExclusionHasAReason(t *testing.T) {
	for name, why := range Excluded {
		if strings.TrimSpace(why) == "" {
			t.Errorf("%s is excluded without a reason", name)
		}
		if carried(name) {
			t.Errorf("%s is both backed up and excluded", name)
		}
	}
}