package mdb

import (
	"log"
	"os"
	"os/exec"
	"testing"
	"time"

	"git.crumpington.com/public/jldb/lib/errs"
)

func TestCrashConsistency(t *testing.T) {
	if testing.Short() {
		t.Skip("Sipping test in short mode.")
	}

	// Build the test binary.
	err := exec.Command(
		"go", "build",
		"-o", "testing/crashconsistency/p",
		"testing/crashconsistency/main.go").Run()
	if err != nil {
		t.Fatal(err)
	}

	defer os.RemoveAll("testing/crashconsistency/p")

	rootDir := t.TempDir()
	defer os.RemoveAll(rootDir)

	for i := 0; i < 32; i++ {
		cmd := exec.Command("testing/crashconsistency/p", rootDir)
		if err := cmd.Start(); err != nil {
			t.Fatal(err)
		}

		time.Sleep(time.Second / 2)

		for {
			if err := cmd.Process.Kill(); err != nil {
				log.Printf("Kill failed: %v", err)
				time.Sleep(time.Second)
				continue
			}
			break
		}

		var (
			db  DataDB
			err error
		)

		for {

			db, err = OpenDataDB(rootDir)
			if err == nil {
				break
			}
			if errs.Locked.Is(err) {
				log.Printf("Locked.")
				time.Sleep(time.Second / 10)
				continue
			}
			t.Fatal(err)
		}

		tx := db.Snapshot()
		computed := db.ComputeCRC(tx)
		stored := db.ReadCRC(tx)
		if computed != stored {
			t.Fatal(stored, computed)
		}

		db.Close()
	}
}