package format

import (
	"errors"
	"os"
	"syscall"
	"testing"
	"time"
)

func TestMain(m *testing.M) {
	code := m.Run()
	CloseExiftool()
	os.Exit(code)
}

func TestExiftoolCloseEndsProcess(t *testing.T) {
	requireTools(t)
	var e exiftool
	if _, err := e.run("-ver"); err != nil {
		t.Fatal(err)
	}
	pid := e.cmd.Process.Pid
	e.close()
	if e.cmd != nil {
		t.Fatal("cmd not cleared")
	}
	if err := syscall.Kill(pid, 0); !errors.Is(err, syscall.ESRCH) {
		t.Fatalf("exiftool pid %d still running after close (kill 0: %v)", pid, err)
	}
}

func TestExiftoolRunAfterCloseFails(t *testing.T) {
	requireTools(t)
	var e exiftool
	e.close()
	before := exiftoolStarts.Load()
	if _, err := e.run("-ver"); err == nil {
		t.Fatal("run after close: want error")
	}
	if exiftoolStarts.Load() != before {
		t.Fatal("run after close started a process")
	}
}

func TestExiftoolTimeoutKillsAndRecovers(t *testing.T) {
	requireTools(t)
	e := exiftool{timeout: time.Nanosecond}
	if _, err := e.run("-ver"); err == nil {
		t.Fatal("want timeout error")
	}
	e.timeout = 0
	out, err := e.run("-ver")
	if err != nil || len(out) == 0 {
		t.Fatalf("run after timeout: %q, %v", out, err)
	}
	e.close()
}