package lang

import "testing"

func TestAnalyzeProducesStructuredUndefinedDiagnostic(t *testing.T) {
	source := `package demo fun main() { println(missing) }`
	program, err := Parse(source)
	if err != nil {
		t.Fatal(err)
	}
	_, diagnostics := AnalyzeWithContext(program, nil)
	if len(diagnostics) != 1 {
		t.Fatalf("diagnostics = %#v", diagnostics)
	}
	diagnostic := diagnostics[0]
	if diagnostic.Code != "undefined-symbol" || diagnostic.Severity != DiagnosticError || diagnostic.Message != "undefined identifier missing" {
		t.Fatalf("unexpected diagnostic: %#v", diagnostic)
	}
	if got := source[diagnostic.Span.Start:diagnostic.Span.End]; got != "missing" {
		t.Fatalf("diagnostic span = %q", got)
	}
}

func TestAnalyzeUsesAdditionalPackagePrograms(t *testing.T) {
	current, err := Parse(`package demo fun main() { helper() }`)
	if err != nil {
		t.Fatal(err)
	}
	sibling, err := Parse(`package demo fun helper() { println("ok") }`)
	if err != nil {
		t.Fatal(err)
	}
	_, diagnostics := AnalyzeWithContext(current, []*Program{sibling})
	if len(diagnostics) != 0 {
		t.Fatalf("package symbol was not resolved: %#v", diagnostics)
	}
}