package main

import (
	"io/ioutil"
	"os"
	"path/filepath"
	"regexp"
	"runtime"
	"testing"
)

var (
	rpcuserRegexp = regexp.MustCompile("(?m)^rpcuser=.+$")
	rpcpassRegexp = regexp.MustCompile("(?m)^rpcpass=.+$")
)

func TestCreateDefaultConfigFile(t *testing.T) {
	// find out where the sample config lives
	_, path, _, ok := runtime.Caller(0)
	if !ok {
		t.Fatalf("Failed finding config file path")
	}
	sampleConfigFile := filepath.Join(filepath.Dir(path), "sample-chain.conf")

	// Setup a temporary directory
	tmpDir, err := ioutil.TempDir("", "chain")
	if err != nil {
		t.Fatalf("Failed creating a temporary directory: %v", err)
	}
	testpath := filepath.Join(tmpDir, "test.conf")

	// copy config file to location of chain binary
	data, err := ioutil.ReadFile(sampleConfigFile)
	if err != nil {
		t.Fatalf("Failed reading sample config file: %v", err)
	}
	appPath, err := filepath.Abs(filepath.Dir(os.Args[0]))
	if err != nil {
		t.Fatalf("Failed obtaining app path: %v", err)
	}
	tmpConfigFile := filepath.Join(appPath, "sample-chain.conf")
	err = ioutil.WriteFile(tmpConfigFile, data, 0644)
	if err != nil {
		t.Fatalf("Failed copying sample config file: %v", err)
	}

	// Clean-up
	defer func() {
		os.Remove(testpath)
		os.Remove(tmpConfigFile)
		os.Remove(tmpDir)
	}()

	err = createDefaultConfigFile(testpath)

	if err != nil {
		t.Fatalf("Failed to create a default config file: %v", err)
	}

	content, err := ioutil.ReadFile(testpath)
	if err != nil {
		t.Fatalf("Failed to read generated default config file: %v", err)
	}

	if !rpcuserRegexp.Match(content) {
		t.Error("Could not find rpcuser in generated default config file.")
	}

	if !rpcpassRegexp.Match(content) {
		t.Error("Could not find rpcpass in generated default config file.")
	}
}