package pact

import (
	"context"
	"testing"
)

// TestMCPCallRoundTrip proves the context accessor stores and reads one
// call, and that a context without one answers ok false.
func TestMCPCallRoundTrip(t *testing.T) {
	want := MCPCall{
		Subject:   MCPSubject{Guard: "user", UserID: 7, Scopes: []string{"read"}, ClientID: "c1", TokenID: 3},
		SessionID: "sess-1",
		Tool:      "acme_echo",
	}
	got, ok := MCPCallFrom(WithMCPCall(context.Background(), want))
	if !ok {
		t.Fatal("MCPCallFrom ok = false, want true")
	}
	if got.Subject.Guard != want.Subject.Guard || got.SessionID != want.SessionID || got.Tool != want.Tool {
		t.Fatalf("MCPCallFrom = %+v, want guard %q session %q tool %q", got, want.Subject.Guard, want.SessionID, want.Tool)
	}
	if _, ok := MCPCallFrom(context.Background()); ok {
		t.Fatal("MCPCallFrom(context.Background()) ok = true, want false")
	}
	if _, ok := MCPCallFrom(nil); ok {
		t.Fatal("MCPCallFrom(nil) ok = true, want false")
	}
	if WithMCPCall(nil, want) != nil {
		t.Fatal("WithMCPCall(nil) invented a context")
	}
}