package util

import (
	"bytes"
	"fmt"
	"os"
	"strings"
	"text/template"

	"github.com/fatih/color"
	"github.com/sergi/go-diff/diffmatchpatch"
)

func TemplateToFile(desFile string, templateContent string, data interface{}) error {
	tpl := template.New("template")
	tpl, err := tpl.Parse(templateContent)
	if err != nil {
		return err
	}

	b := bytes.Buffer{}
	err = tpl.Execute(&b, data)
	if err != nil {
		return err
	}

	err = WriteFile(desFile, b.Bytes())
	if err != nil {
		return err
	}
	return nil
}

var defaultPrintDiff = color.WhiteString

func IsChange(diff []diffmatchpatch.Diff) bool {
	for _, d := range diff {
		if d.Type != diffmatchpatch.DiffEqual {
			return true
		}
	}
	return false
}

// AddLine 增加行号 TODO: 颜色不完美
func AddLine(s string) string {
	lines := strings.Split(s, "\n")
	for i, line := range lines {
		// lines[i] = fmt.Sprintf("%s %s", defaultPrintDiff("%4d.", i+1), line)
		lines[i] = fmt.Sprintf("%4d. %s", i+1, line)
	}
	return strings.Join(lines, "\n")
}

func WriteFile(filePath string, data []byte) error {
	color.Green("写入[%s]文件...", filePath)
	toFileContent, err := os.ReadFile(filePath)
	if err == nil {
		dmp := diffmatchpatch.New()
		diffContent := dmp.DiffMain(string(toFileContent), string(data), true)

		if IsChange(diffContent) {
			color.Red("文件[%s]已存在:", filePath)
			b := bytes.Buffer{}
			diffContent = dmp.DiffCleanupSemanticLossless(diffContent)
			for _, diff := range diffContent {
				switch diff.Type {
				case diffmatchpatch.DiffDelete:
					b.WriteString(color.RedString(diff.Text))
				case diffmatchpatch.DiffInsert:
					b.WriteString(color.GreenString(diff.Text))
				case diffmatchpatch.DiffEqual:
					b.WriteString(diff.Text)
				}
			}
			fmt.Println(AddLine(b.String()))
			if !ReadBoolWithMessage("是否确认此次修改(y修改/n跳过): ") {
				color.Red("跳过文件: %s\n\n", filePath)
				return nil
			}
		} else {
			color.Red("文件已存在且无变动,跳过文件: %s\n\n", filePath)
			return nil
		}
	}

	file, err := os.OpenFile(filePath, os.O_WRONLY|os.O_TRUNC|os.O_CREATE, os.ModePerm)
	if err != nil {
		return err
	}
	defer file.Close()

	_, err = file.Write(data)
	color.Red("写入文件完成: %s\n\n", filePath)
	return err
}

func WriteFileWithNotEdit(filePath string, data []byte) error {
	notEdit := "# Code generated by wujian-develop_tool. DO NOT EDIT.\n\n"
	return WriteFile(filePath, []byte(notEdit+string(data)))
}

// ExistFile 文件是否存在
func ExistFile(filePath string) bool {
	info, err := os.Stat(filePath)
	return err == nil && !info.IsDir()
}

// ExistDir 目录是否存在
func ExistDir(dirPath string) bool {
	info, err := os.Stat(dirPath)
	return err == nil && info.IsDir()
}