package main

import (
	"fmt"
	"testing"

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

func TestLoadMappingFile(t *testing.T) {

	t.Run("load the mapping file correctly - initial load", func(t *testing.T) {
		tmpDir := t.TempDir()

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

		expected := fmt.Sprintf("%s/tmp/rules.json", tmpDir)

		cpFileForTest(t, rulesJsonFp, expected)

		cfg := &Config{}

		assert.Equal(t, cfg.MappingFilePath, "")
		assert.Empty(t, cfg.MappingRules)
		err := cfg.LoadMappingFile(expected)
		assert.Equal(t, err, nil)
		assert.Equal(t, cfg.MappingFilePath, expected)
		assert.NotEmpty(t, cfg.MappingRules)
	})

	t.Run("load the mapping file correctly - reload", func(t *testing.T) {
		tmpDir := t.TempDir()

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

		expected := fmt.Sprintf("%s/tmp/rules.json", tmpDir)

		cpFileForTest(t, rulesJsonFp, expected)

		cfg := &Config{}

		assert.Equal(t, cfg.MappingFilePath, "")
		assert.Empty(t, cfg.MappingRules)
		err := cfg.LoadMappingFile(expected)
		assert.Equal(t, err, nil)
		assert.Equal(t, cfg.MappingFilePath, expected)
		assert.NotEmpty(t, cfg.MappingRules)
		oldRules := cfg.MappingRules

		rulesJsonFp = "testData/rules2.json"

		cpFileForTest(t, rulesJsonFp, expected)

		err = cfg.LoadMappingFile(expected)
		assert.Equal(t, err, nil)
		assert.Equal(t, cfg.MappingFilePath, expected)
		assert.NotEmpty(t, cfg.MappingRules)

		newRules := cfg.MappingRules

		assert.NotEqualValues(t, oldRules, newRules)
	})
}

func TestGetDefaults(t *testing.T) {
	actual, err := getDefaults()
	assert.Equal(t, err, nil)
	assert.Contains(t, actual, "rulesFp")
	assert.Contains(t, actual, "logFp")
	assert.Contains(t, actual, "confFp")
}

func TestSizeIsConfigured(t *testing.T) {
	tests := map[string]struct {
		input string
		want  bool
	}{
		"wrong input - K":    {input: "5677.45K", want: false},
		"wrong input - KiB":  {input: "5677.45KiB", want: false},
		"wrong input - M":    {input: "9.45M", want: false},
		"wrong input - G":    {input: "9.45G", want: false},
		"correct input - KB": {input: "5.45KB", want: true},
		"correct input - MB": {input: "5677.45MB", want: true},
		"correct input - GB": {input: "9.45GB", want: true},
	}

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

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

	tempLogsDir := fmt.Sprintf("%s/tmp/logs", tmpDir)
	tempConfigDir := fmt.Sprintf("%s/tmp/config", tmpDir)

	mkDirForTest(t, tempLogsDir)
	mkDirForTest(t, tempConfigDir)

	defaultConfig := map[string]string{
		"rulesFp": fmt.Sprintf("%s/rules.json", tempConfigDir),
		"confFp":  fmt.Sprintf("%s/config.json", tempConfigDir),
		"logFp":   fmt.Sprintf("%s/app.log", tempLogsDir),
	}

	ok := IsDirEmpty(t, tempConfigDir)
	assert.Equal(t, ok, true)
	ok = IsDirEmpty(t, tempLogsDir)
	assert.Equal(t, ok, true)

	expected, err := generateDefaultConfigFile(defaultConfig)
	assert.Equal(t, err, nil)
	assert.NotEmpty(t, expected)

	ok = IsDirEmpty(t, tempConfigDir)
	assert.Equal(t, ok, false)
	ok = IsDirEmpty(t, tempLogsDir)
	assert.Equal(t, ok, true)

}