package service

import (
	"database/sql"
	"testing"
	"time"

	"github.com/daniil/homelab-api/internal/model"
)

func TestNewHabitService(t *testing.T) {
	svc := NewHabitService(nil, nil)
	if svc == nil {
		t.Fatal("expected non-nil HabitService")
	}
}

func TestErrFutureDate(t *testing.T) {
	if ErrFutureDate.Error() != "cannot log habit for future date" {
		t.Errorf("unexpected: %s", ErrFutureDate.Error())
	}
}

func TestErrAlreadyLogged(t *testing.T) {
	if ErrAlreadyLogged.Error() != "habit already logged for this date" {
		t.Errorf("unexpected: %s", ErrAlreadyLogged.Error())
	}
}

// When totalLogs==0 the function returns immediately without any DB access.
func TestCalculateCompletionPctWithFreezes_ZeroLogs(t *testing.T) {
	svc := &HabitService{}
	habit := &model.Habit{
		Frequency: "daily",
		StartDate: sql.NullTime{Time: time.Now().AddDate(0, 0, -30), Valid: true},
	}
	pct := svc.calculateCompletionPctWithFreezes(habit, 0)
	if pct != 0 {
		t.Errorf("expected 0%% for zero logs, got %.2f", pct)
	}
}