package main

import (
	"fmt"
	"os"
	"testing"

	"github.com/stretchr/testify/assert"
)

func TestTruncate(t *testing.T) {
	tmpDir := t.TempDir()

	mkDirForTest(t, fmt.Sprintf("%s/tmp", tmpDir))
	rulesJsonFp := "testData/app_over_size.log"

	tmpLf := fmt.Sprintf("%s/tmp/app.log", tmpDir)

	cpFileForTest(t, rulesJsonFp, tmpLf)

	lf := &LogFile{
		path: tmpLf,
	}

	lf.path = tmpLf
	// Continue from here
	isEmpty := isFileEmpty(t, tmpLf)
	assert.Equal(t, isEmpty, false)

	err := lf.truncate()
	assert.Equal(t, err, nil)
	isEmpty = isFileEmpty(t, tmpLf)
	assert.Equal(t, isEmpty, true)
}

func TestMakeCopyTo(t *testing.T) {
	tmpDir := t.TempDir()

	mkDirForTest(t, fmt.Sprintf("%s/tmp", tmpDir))
	rulesJsonFp := "testData/app_over_size.log"

	tmpLf := fmt.Sprintf("%s/tmp/app.log", tmpDir)

	cpFileForTest(t, rulesJsonFp, tmpLf)

	newLocation := fmt.Sprintf("%s/tmp/app.1.log", tmpDir)

	lf := &LogFile{
		path: tmpLf,
	}

	lf.path = tmpLf

	isEmpty := isFileEmpty(t, tmpLf)
	assert.Equal(t, isEmpty, false)

	err := lf.makeCopyTo(newLocation)
	assert.Equal(t, err, nil)
	isEmpty = isFileEmpty(t, tmpLf)
	assert.Equal(t, isEmpty, false)
	ok := areFilesTheSame(t, lf.path, newLocation)
	assert.Equal(t, ok, true)
}

func TestPrettyByteSize(t *testing.T) {
	tests := map[string]struct {
		input int
		want  string
	}{
		"KB": {input: 5675, want: "5.5KB"},
		"MB": {input: 7060600, want: "6.7MB"},
		"GB": {input: 8000000000, want: "7.5GB"},
		"TB": {input: 1300007000000, want: "1.2TB"},
		"EB": {input: 1300007000000000000, want: "1.1EB"},
	}

	for name, tc := range tests {
		t.Run(name, func(t *testing.T) {
			got := prettyByteSize(int64(tc.input))
			assert.Equal(t, got, tc.want)
		})
	}
}

func TestCompressFile(t *testing.T) {
	tmpDir := t.TempDir()

	mkDirForTest(t, fmt.Sprintf("%s/tmp", tmpDir))
	rulesJsonFp := "testData/app_over_size.log"

	tmpLf := fmt.Sprintf("%s/tmp/app.log", tmpDir)

	cpFileForTest(t, rulesJsonFp, tmpLf)

	expected := fmt.Sprintf("%s/tmp/app.log.gz", tmpDir)

	err := compressOldFile(tmpLf)
	assert.Equal(t, err, nil)
	exists := doesFileExist(tmpLf)
	assert.Equal(t, exists, false)
	exists = doesFileExist(expected)
	assert.Equal(t, exists, true)
}

func TestRotate(t *testing.T) {
	tmpDir := t.TempDir()

	mkDirForTest(t, fmt.Sprintf("%s/tmp", tmpDir))
	rulesJsonFp := "testData/app_over_size.log"

	tmpLf := fmt.Sprintf("%s/tmp/app.log", tmpDir)

	cpFileForTest(t, rulesJsonFp, tmpLf)

	lf := &LogFile{
		path: tmpLf,
	}

	fd, _ := os.Open(tmpLf)
	lf.handle = fd

	isEmpty := isFileEmpty(t, tmpLf)
	assert.Equal(t, isEmpty, false)
	err := lf.rotate(true)
	assert.Equal(t, err, nil)
	exists := doesFileExist(tmpLf)
	assert.Equal(t, exists, true)
	isEmpty = isFileEmpty(t, tmpLf)
	assert.Equal(t, isEmpty, true)

	expected := walkMatch(t, tmpDir, "*.gz")
	assert.NotEmpty(t, expected)
	t.Logf("%+v", expected)

	assert.NotEqual(t, lf.handle, fd)
}