//go:build !llgo
// +build !llgo

package build

import (
	"bytes"
	"fmt"
	"io"
	"os"
	"os/exec"
	"path/filepath"
	"runtime"
	"testing"

	"github.com/goplus/llgo/internal/mockable"
)

func mockRun(args []string, cfg *Config) {
	const maxAttempts = 3
	var lastErr error
	var lastPanic interface{}
	for attempt := 0; attempt < maxAttempts; attempt++ {
		mockable.EnableMock()
		func() {
			defer func() {
				if r := recover(); r != nil {
					if r != "exit" {
						lastPanic = r
					} else {
						exitCode := mockable.ExitCode()
						if (exitCode != 0) != false {
							lastPanic = fmt.Errorf("got exit code %d", exitCode)
						}
					}
				}
			}()
			file, _ := os.CreateTemp("", "llgo-*")
			cfg.OutFile = file.Name()
			file.Close()
			defer os.Remove(cfg.OutFile)
			_, err := Do(args, cfg)
			if err == nil {
				return // Success, return immediately from the inner function
			}
			lastErr = err
		}()

		if lastPanic == nil && lastErr == nil {
			return // Success, return from mockRun
		}
		// Continue to next attempt if this one failed
	}
	// If we get here, all attempts failed
	if lastPanic != nil {
		panic(lastPanic)
	}
	panic(fmt.Errorf("all %d attempts failed, last error: %v", maxAttempts, lastErr))
}

func TestRun(t *testing.T) {
	mockRun([]string{"../../cl/_testgo/print"}, &Config{Mode: ModeRun})
}

func TestTest(t *testing.T) {
	// FIXME(zzy): with builtin package test in a llgo test ./... will cause duplicate symbol error
	mockRun([]string{"../../cl/_testgo/runtest"}, &Config{Mode: ModeTest})
}

func TestExtest(t *testing.T) {
	originalStdout := os.Stdout
	defer func() { os.Stdout = originalStdout }()

	r, w, err := os.Pipe()
	if err != nil {
		t.Fatalf("os.Pipe failed: %v", err)
	}
	os.Stdout = w
	outputChan := make(chan string)
	go func() {
		var data bytes.Buffer
		io.Copy(&data, r)
		outputChan <- data.String()
	}()

	mockRun([]string{"../../cl/_testgo/runextest/..."}, &Config{Mode: ModeTest})

	w.Close()
	got := <-outputChan
	expected := "PASS\nPASS\nPASS\nPASS\n"
	if got != expected {
		t.Errorf("Expected output %q, but got %q", expected, got)
	}
}

func TestCmpTest(t *testing.T) {
	mockRun([]string{"../../cl/_testgo/runtest"}, &Config{Mode: ModeCmpTest})
}

const (
	rewriteMainPkg = "github.com/goplus/llgo/cl/_testgo/rewrite"
	rewriteDepPkg  = rewriteMainPkg + "/dep"
	rewriteDirPath = "../../cl/_testgo/rewrite"
)

func TestLdFlagsRewriteVars(t *testing.T) {
	buildRewriteBinary(t, false, "build-main", "build-pkg")
	buildRewriteBinary(t, false, "rerun-main", "rerun-pkg")
}

func TestLdFlagsRewriteVarsMainAlias(t *testing.T) {
	buildRewriteBinary(t, true, "alias-main", "alias-pkg")
}

func buildRewriteBinary(t *testing.T, useMainAlias bool, mainVal, depVal string) {
	t.Helper()
	binPath := filepath.Join(t.TempDir(), "rewrite")
	if runtime.GOOS == "windows" {
		binPath += ".exe"
	}

	cfg := &Config{Mode: ModeBuild, OutFile: binPath}
	mainKey := rewriteMainPkg
	var mainPkgs []string
	if useMainAlias {
		mainKey = "main"
		mainPkgs = []string{rewriteMainPkg}
	}
	mainPlain := mainVal + "-plain"
	depPlain := depVal + "-plain"
	gorootVal := "goroot-" + mainVal
	versionVal := "version-" + mainVal
	addGlobalString(cfg, mainKey+".VarName="+mainVal, mainPkgs)
	addGlobalString(cfg, mainKey+".VarPlain="+mainPlain, mainPkgs)
	addGlobalString(cfg, rewriteDepPkg+".VarName="+depVal, nil)
	addGlobalString(cfg, rewriteDepPkg+".VarPlain="+depPlain, nil)
	addGlobalString(cfg, "runtime.defaultGOROOT="+gorootVal, nil)
	addGlobalString(cfg, "runtime.buildVersion="+versionVal, nil)

	if _, err := Do([]string{rewriteDirPath}, cfg); err != nil {
		t.Fatalf("ModeBuild failed: %v", err)
	}
	got := runBinary(t, binPath)
	want := fmt.Sprintf(
		"main.VarName: %s\nmain.VarPlain: %s\ndep.VarName: %s\ndep.VarPlain: %s\nruntime.GOROOT(): %s\nruntime.Version(): %s\n",
		mainVal, mainPlain, depVal, depPlain, gorootVal, versionVal,
	)
	if got != want {
		t.Fatalf("unexpected binary output:\nwant %q\ngot  %q", want, got)
	}
}

func runBinary(t *testing.T, path string, args ...string) string {
	t.Helper()
	cmd := exec.Command(path, args...)
	output, err := cmd.CombinedOutput()
	if err != nil {
		t.Fatalf("failed to run %s: %v\n%s", path, err, output)
	}
	return string(output)
}