package dyzurbot

import (
	"path/filepath"
	"testing"
	"time"
)

func sampleRota() Rota {
	return Rota{
		Weeks:  []DutyWeek{{WeekStart: time.Date(2026, 1, 5, 0, 0, 0, 0, time.UTC), Person1: "Jan Kowalski", Person2: "Anna Nowak"}},
		People: []Person{{Name: "Piotr Wiśniewski", DutyCount: 1}},
	}
}

func TestStoreReplaceThenLoadRoundTrips(t *testing.T) {
	path := filepath.Join(t.TempDir(), "rota.json")
	synced := time.Date(2026, 6, 17, 20, 0, 0, 0, time.UTC)

	s1 := NewStore(path)
	if err := s1.Replace(sampleRota(), synced); err != nil {
		t.Fatalf("Replace: %v", err)
	}

	s2 := NewStore(path)
	if err := s2.Load(); err != nil {
		t.Fatalf("Load: %v", err)
	}
	rota, ts := s2.Snapshot()
	if !ts.Equal(synced) {
		t.Errorf("lastSynced: got %v, want %v", ts, synced)
	}
	if len(rota.Weeks) != 1 || rota.Weeks[0].Person1 != "Jan Kowalski" {
		t.Errorf("weeks not restored: %+v", rota.Weeks)
	}
	if len(rota.People) != 1 || rota.People[0].DutyCount != 1 {
		t.Errorf("people not restored: %+v", rota.People)
	}
}

func TestStoreLoadMissingFileIsNotError(t *testing.T) {
	s := NewStore(filepath.Join(t.TempDir(), "does-not-exist.json"))
	if err := s.Load(); err != nil {
		t.Fatalf("Load of missing file should be nil, got %v", err)
	}
	rota, ts := s.Snapshot()
	if len(rota.Weeks) != 0 || len(rota.People) != 0 || !ts.IsZero() {
		t.Errorf("empty store expected, got weeks=%d people=%d ts=%v", len(rota.Weeks), len(rota.People), ts)
	}
}

func TestStoreSnapshotIsACopy(t *testing.T) {
	s := NewStore(filepath.Join(t.TempDir(), "rota.json"))
	if err := s.Replace(sampleRota(), time.Now()); err != nil {
		t.Fatalf("Replace: %v", err)
	}
	rota, _ := s.Snapshot()
	rota.Weeks[0].Person1 = "MUTATED"

	again, _ := s.Snapshot()
	if again.Weeks[0].Person1 != "Jan Kowalski" {
		t.Errorf("snapshot mutation leaked into store: %q", again.Weeks[0].Person1)
	}
}