package builder

import (
	"context"
	"os"
	"os/exec"
	"path/filepath"
	"testing"
)

func goAvailable() bool {
	_, err := exec.LookPath("go")
	return err == nil
}

func TestBuildFusionCompileFailsWithoutGo(t *testing.T) {
	h, database := testHandlerDB(t)
	defer database.Close()
	setFakeGoFail(t, h)
	buildDir := t.TempDir()
	worker := filepath.Join(buildDir, "worker.exe")
	if err := os.WriteFile(worker, []byte("w"), 0644); err != nil {
		t.Fatal(err)
	}
	prep := filepath.Join(t.TempDir(), "doc.pdf")
	if err := os.WriteFile(prep, []byte("%PDF"), 0644); err != nil {
		t.Fatal(err)
	}
	_, err := h.buildFusion(context.Background(), buildDir, prep, worker, "runner.exe", "parallel")
	if err == nil {
		t.Fatal("expected compile error from fake go")
	}
}

func TestBuildFusionFromRequestPaired(t *testing.T) {
	if !goAvailable() {
		t.Skip("go not in PATH")
	}
	h, database := testHandlerDB(t)
	defer database.Close()
	buildDir := t.TempDir()
	worker := filepath.Join(buildDir, "worker.exe")
	if err := os.WriteFile(worker, []byte("MZ"), 0644); err != nil {
		t.Fatal(err)
	}
	prep := filepath.Join(t.TempDir(), "report.pdf")
	if err := os.WriteFile(prep, []byte("%PDF-1.4"), 0644); err != nil {
		t.Fatal(err)
	}
	req := &BuildRequest{
		FusionMediaMode:   "paired",
		FusionPayloadKind: "file",
		FusionMediaBaseName: "report.pdf",
	}
	res, err := h.buildFusionFromRequest(context.Background(), buildDir, prep, worker, req)
	if err != nil {
		t.Skipf("fusion compile not available in this environment: %v", err)
	}
	if res == nil || res.LauncherPath == "" {
		t.Fatal("expected launcher path")
	}
}