package generate

import "os"
import "fmt"
import "os/exec"
import "testing"
import "path/filepath"

func testGenerateRun(test *testing.T, protocol *Protocol, imports string, testCase string) {
	// open files
	dir, err := os.MkdirTemp(os.TempDir(), "hopp-generate-test-*")
	if err != nil { test.Fatal(err) }
	defer os.RemoveAll(dir)
	sourceFile, err := os.Create(filepath.Join(dir, "protocol.go"))
	if err != nil { test.Fatal(err) }
	defer sourceFile.Close()
	mainFile, err := os.Create(filepath.Join(dir, "main.go"))
	if err != nil { test.Fatal(err) }
	defer mainFile.Close()

	// generate protocol
	generator := Generator {
		Output: sourceFile,
		PackageName: "main",
	}
	_, err = generator.Generate(protocol)
	if err != nil { test.Fatal(err) }

	// build static source files
	imports = `
		import "log"
		` + imports
	setup := `log.Println("*** BEGIN TEST CASE OUTPUT ***")`
	teardown := `log.Println("--- END TEST CASE OUTPUT ---")`
	fmt.Fprintf(
		mainFile, "package main\n%s\nfunc main() {%s\n%s\n%s\n}\n",
		imports, setup, testCase, teardown)

	// build and run test
	command := exec.Command("go", "run", filepath.Join(dir, "main.go"))
	output, err := command.CombinedOutput()
	test.Logf("output of %v:\n%s", command, output)
	if err != nil { test.Fatal(err) }
}