package vision

import (
	"bytes"
	"context"
	"strings"
	"testing"

	"git.yeij.top/AskaEth/Cyrene_v2/internal/runtime/model"
)

func TestDetectMultimodal(t *testing.T) {
	t.Parallel()
	tests := []struct {
		name string
		msgs []model.Message
		want bool
	}{
		{name: "text only", msgs: []model.Message{model.TextMessage(model.RoleUser, "hi")}, want: false},
		{name: "empty", msgs: nil, want: false},
		{name: "single image", msgs: []model.Message{model.ImageMessage(model.RoleUser, "what", "data:image/png;base64,abc")}, want: true},
		{name: "image no text", msgs: []model.Message{model.ImageMessage(model.RoleUser, "", "https://x/y.png")}, want: true},
		{name: "image in later turn", msgs: []model.Message{
			model.TextMessage(model.RoleUser, "hi"),
			model.ImageMessage(model.RoleAssistant, "", "http://x/z.png"),
		}, want: true},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			t.Parallel()
			if got := DetectMultimodal(tt.msgs); got != tt.want {
				t.Errorf("DetectMultimodal() = %v, want %v", got, tt.want)
			}
		})
	}
}

func TestParseImageRef(t *testing.T) {
	t.Parallel()
	tests := []struct {
		name       string
		src        string
		wantSource ImageSource
	}{
		{name: "http url", src: "https://a/b.png", wantSource: SourceURL},
		{name: "https url", src: "https://a/b.png", wantSource: SourceURL},
		{name: "file uri", src: "file:///tmp/a.png", wantSource: SourcePath},
		{name: "data uri", src: "data:image/png;base64,abc", wantSource: SourceBase64},
		{name: "raw base64", src: "aGVsbG8=", wantSource: SourceBase64},
		{name: "empty rejected", src: "", wantSource: ""},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			t.Parallel()
			ref, err := ParseImageRef(tt.src)
			if tt.src == "" {
				if err == nil {
					t.Fatal("want error for empty source, got nil")
				}
				return
			}
			if err != nil {
				t.Fatalf("ParseImageRef error: %v", err)
			}
			if ref.Source != tt.wantSource {
				t.Errorf("Source = %q, want %q", ref.Source, tt.wantSource)
			}
		})
	}
}

// TestResolve_Base64 钉住 data: URI 那条路：载荷被解码成原始字节，MIME 取前缀
// 里声明的那个。**载荷必须是真的图片字节** —— data: URI 带声明，解码后要过内容
// 嗅探（image.go 的 checkInlinePayload），拿非图片字节（如 "hello"）当载荷
// 现在会被明确否决，而不是挂着 image/png 的声明送进模型。
func TestResolve_Base64(t *testing.T) {
	t.Parallel()
	png := pngBytes(t)
	ref, err := ParseImageRef(DataURI("image/png", png))
	if err != nil {
		t.Fatalf("ParseImageRef error: %v", err)
	}
	mime, data, err := Resolve(context.Background(), ref, nil)
	if err != nil {
		t.Fatalf("Resolve error: %v", err)
	}
	if mime != "image/png" {
		t.Errorf("mime = %q, want image/png", mime)
	}
	if !bytes.Equal(data, png) {
		t.Errorf("data = %d bytes, want the decoded payload (%d bytes)", len(data), len(png))
	}
}

func TestResolve_DataURI(t *testing.T) {
	t.Parallel()
	got := DataURI("image/webp", []byte{1, 2, 3})
	if !strings.HasPrefix(got, "data:image/webp;base64,") {
		t.Errorf("DataURI = %q, want data:image/webp;base64,", got)
	}
}