package minecraft

import (
	"net/http"
	"net/http/httptest"
	"strings"
	"sync"
	"testing"
)

func TestResolveProxyVersion(t *testing.T) {
	data := `{
		"1.20.1": "2.6.0",
		"1.20.2-1.20.4": "2.7.0",
		"1.20.5": "2.8.0",
		"1.21.0-1.21.8": "2.9.0"
	}`
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.URL.Path != "/zpacks/minecraft/fabric/fabric-proxy-lite/map.json" {
			http.NotFound(w, r)
			return
		}
		w.Header().Set("Content-Type", "application/json")
		_, _ = w.Write([]byte(data))
	}))
	defer server.Close()

	t.Setenv("ZLH_ARTIFACT_BASE_URL", server.URL)
	origRoot := fabricProxyArtifactRoot
	origMap := fabricProxyMap
	origErr := fabricProxyMapErr
	origOnce := fabricProxyMapOnce
	fabricProxyArtifactRoot = "zpacks/minecraft/fabric/fabric-proxy-lite"
	fabricProxyMap = nil
	fabricProxyMapErr = nil
	fabricProxyMapOnce = sync.Once{}
	t.Cleanup(func() {
		fabricProxyArtifactRoot = origRoot
		fabricProxyMap = origMap
		fabricProxyMapErr = origErr
		fabricProxyMapOnce = origOnce
	})

	tests := []struct {
		name    string
		version string
		want    string
		wantErr string
	}{
		{name: "exact match", version: "1.20.1", want: "2.6.0"},
		{name: "range lower bound", version: "1.20.2", want: "2.7.0"},
		{name: "range middle", version: "1.20.3", want: "2.7.0"},
		{name: "range upper bound", version: "1.21.8", want: "2.9.0"},
		{name: "missing", version: "1.19.4", wantErr: "no fabricproxy-lite mapping"},
	}

	for _, tc := range tests {
		t.Run(tc.name, func(t *testing.T) {
			fabricProxyMap = nil
			fabricProxyMapErr = nil
			fabricProxyMapOnce = sync.Once{}

			got, err := resolveProxyVersion(tc.version)
			if tc.wantErr != "" {
				if err == nil || !strings.Contains(err.Error(), tc.wantErr) {
					t.Fatalf("expected error containing %q, got %v", tc.wantErr, err)
				}
				return
			}
			if err != nil {
				t.Fatalf("resolveProxyVersion(%q) error = %v", tc.version, err)
			}
			if got != tc.want {
				t.Fatalf("resolveProxyVersion(%q) = %q, want %q", tc.version, got, tc.want)
			}
		})
	}
}