package pagination

import "testing"

func TestCalcPaginationTotalPagesZeroItems(t *testing.T) {
	if got := CalcPaginationTotalPages(0, 10); got != 0 {
		t.Errorf("expected 0, got %d", got)
	}
}

func TestCalcPaginationTotalPagesZeroLimit(t *testing.T) {
	if got := CalcPaginationTotalPages(100, 0); got != 0 {
		t.Errorf("expected 0, got %d", got)
	}
}

func TestCalcPaginationTotalPagesZeroBoth(t *testing.T) {
	if got := CalcPaginationTotalPages(0, 0); got != 0 {
		t.Errorf("expected 0, got %d", got)
	}
}

func TestCalcPaginationTotalPagesExactMultiple(t *testing.T) {
	if got := CalcPaginationTotalPages(100, 10); got != 10 {
		t.Errorf("expected 10, got %d", got)
	}
}

func TestCalcPaginationTotalPagesPartialLastPage(t *testing.T) {
	if got := CalcPaginationTotalPages(101, 10); got != 11 {
		t.Errorf("expected 11, got %d", got)
	}
}

func TestCalcPaginationTotalPagesSingleItem(t *testing.T) {
	if got := CalcPaginationTotalPages(1, 10); got != 1 {
		t.Errorf("expected 1, got %d", got)
	}
}

func TestCalcPaginationTotalPagesItemsLessThanLimit(t *testing.T) {
	if got := CalcPaginationTotalPages(5, 10); got != 1 {
		t.Errorf("expected 1, got %d", got)
	}
}

func TestCalcPaginationTotalPagesLimitOfOne(t *testing.T) {
	if got := CalcPaginationTotalPages(7, 1); got != 7 {
		t.Errorf("expected 7, got %d", got)
	}
}

func TestCalcPaginationTotalPagesItemsEqualLimit(t *testing.T) {
	if got := CalcPaginationTotalPages(10, 10); got != 1 {
		t.Errorf("expected 1, got %d", got)
	}
}

func TestCalcPaginationTotalPagesLargeNumbers(t *testing.T) {
	if got := CalcPaginationTotalPages(1_000_000, 250); got != 4000 {
		t.Errorf("expected 4000, got %d", got)
	}
}

func TestCalcPaginationTotalPagesOneMoreThanMultiple(t *testing.T) {
	if got := CalcPaginationTotalPages(11, 5); got != 3 {
		t.Errorf("expected 3, got %d", got)
	}
}

func TestPaginationStructFields(t *testing.T) {
	p := Pagination{
		Page:             2,
		Limit:            25,
		TotalPages:       4,
		TotalItems:       100,
		CurrentPageCount: 25,
	}
	if p.Page != 2 || p.Limit != 25 || p.TotalPages != 4 || p.TotalItems != 100 || p.CurrentPageCount != 25 {
		t.Errorf("unexpected pagination struct values: %+v", p)
	}
}