package lagoon

import (
	"encoding/json"
	"strings"
	"testing"
)

func TestPaginateEnvelope(t *testing.T) {
	got := Paginate([]string{"a", "b", "c"}, 1, 2, 3)
	if got.Meta.CurrentPage != 1 || got.Meta.LastPage != 2 || got.Meta.PerPage != 2 || got.Meta.Total != 3 {
		t.Fatalf("meta = %+v", got.Meta)
	}
	raw, err := json.Marshal(got)
	if err != nil {
		t.Fatal(err)
	}
	if strings.Contains(string(raw), "links") {
		t.Fatalf("envelope must not contain links: %s", raw)
	}
	if !strings.Contains(string(raw), `"data"`) || !strings.Contains(string(raw), `"meta"`) {
		t.Fatalf("missing data/meta: %s", raw)
	}
}

func TestPaginateZeroPerPage(t *testing.T) {
	got := Paginate([]int{1}, 1, 0, 10)
	if got.Meta.LastPage != 1 {
		t.Fatalf("last_page = %d, want 1", got.Meta.LastPage)
	}
}

func TestPaginateNilDataIsEmptyArray(t *testing.T) {
	got := Paginate[string](nil, 1, 10, 0)
	raw, err := json.Marshal(got)
	if err != nil {
		t.Fatal(err)
	}
	if !strings.Contains(string(raw), `"data":[]`) {
		t.Fatalf("nil rows must marshal as []: %s", raw)
	}
}