package llm

import "testing"

func TestResponseIsEmpty(t *testing.T) {
	img := ImagePart{MIME: "image/png", Data: []byte{0x89, 0x50, 0x4e, 0x47}}
	tests := []struct {
		name string
		resp *Response
		want bool
	}{
		{"nil response", nil, true},
		{"no parts, no tool calls", &Response{FinishReason: FinishStop}, true},
		{"single empty text part", &Response{Parts: []Part{Text("")}}, true},
		{"whitespace-only text", &Response{Parts: []Part{Text("  \n\t ")}}, true},
		{"real text", &Response{Parts: []Part{Text("hello")}}, false},
		{"tool call, no text", &Response{ToolCalls: []ToolCall{{ID: "1", Name: "x"}}}, false},
		{"image only", &Response{Parts: []Part{img}}, false},
		{"empty text but a tool call", &Response{Parts: []Part{Text("")}, ToolCalls: []ToolCall{{ID: "1", Name: "x"}}}, false},
		{"whitespace text plus an image", &Response{Parts: []Part{Text("  "), img}}, false},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if got := tt.resp.IsEmpty(); got != tt.want {
				t.Errorf("IsEmpty() = %v, want %v", got, tt.want)
			}
		})
	}
}