package imagerequest

import (
	"errors"
	"testing"
)

func TestValidateImageRequest(t *testing.T) {
	t.Parallel()

	tests := []struct {
		name    string
		req     Request
		wantErr error
	}{
		{
			name: "within bounds",
			req: Request{Transform: Transform{
				Size: Size{Width: 800, Height: 600}, FitMode: FitCover,
			}},
		},
		{
			name: "original size and empty fit",
			req:  Request{Transform: Transform{Size: Size{Width: 0, Height: 0}}},
		},
		{
			name: "width over limit",
			req: Request{Transform: Transform{
				Size: Size{Width: MaxDimension + 1, Height: 600},
			}},
			wantErr: ErrDimensionTooLarge,
		},
		{
			name: "height over limit",
			req: Request{Transform: Transform{
				Size: Size{Width: 800, Height: MaxDimension + 1},
			}},
			wantErr: ErrDimensionTooLarge,
		},
		{
			name:    "negative width",
			req:     Request{Transform: Transform{Size: Size{Width: -1, Height: 600}}},
			wantErr: ErrInvalidSize,
		},
		{
			name: "invalid fit mode",
			req: Request{Transform: Transform{
				Size: Size{Width: 800, Height: 600}, FitMode: "bogus",
			}},
			wantErr: ErrInvalidFitMode,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			t.Parallel()

			err := ValidateImageRequest(&tt.req)
			if tt.wantErr == nil {
				if err != nil {
					t.Fatalf("ValidateImageRequest() error = %v, want nil", err)
				}

				return
			}

			if !errors.Is(err, tt.wantErr) {
				t.Fatalf("ValidateImageRequest() error = %v, want %v", err, tt.wantErr)
			}
		})
	}
}