package main

import (
	"fmt"
	"os"
	"path"
	"path/filepath"
	"strings"

	"git.apinb.com/bsm-sdk/engine/utils"
	"github.com/jhump/protoreflect/desc"
	"github.com/jhump/protoreflect/desc/protoparse"
)

var (
	protoPath string = "./proto"
	jsPath    string = "./axios/service"
)

func main() {
	fmt.Println("Conv poroto file to js file.")

	srvPaths := getSubDirs(protoPath)
	fmt.Println("Root:", protoPath, srvPaths, "JS Out:", jsPath)

	parseProtos(protoPath, srvPaths[1])

}

func getSubDirs(root string) []string {
	var paths []string

	files, _ := os.ReadDir(root)
	for _, file := range files {
		if file.IsDir() {
			paths = append(paths, file.Name())
		}
	}

	return paths
}

func parseProtos(root, dir string) {
	//var msg []pbparser.MessageElement
	var mess []*desc.MessageDescriptor

	fPath := path.Join(root, dir)
	tsPath := path.Join(jsPath, dir)

	files, _ := os.ReadDir(fPath)
	for _, file := range files {
		if file.IsDir() {
			continue
		} else {
			pfPath := filepath.Join(fPath, file.Name())

			Parser := protoparse.Parser{
				IncludeSourceCodeInfo: true,
			}
			descs, err := Parser.ParseFiles(pfPath)
			if err != nil {
				panic(err)
			}

			mess = append(mess, descs[0].GetMessageTypes()...)

		}
	}

	writeMessageTypes(tsPath, mess)
}

func writeSrvs(fileName string) {

}

func writeMessageTypes(tsPath string, msg []*desc.MessageDescriptor) {
	tpl := `
{{Commit}}
export interface {{Name}} {
{{Data}}
}`

	keyMap := make(map[string]int)

	var bodys []string
	for _, msgItem := range msg {
		var data []string
		var msgBody = tpl

		for _, fd := range msgItem.GetFields() {
			data = append(data, dispFields(fd))
		}

		keyFname := strings.ToLower(msgItem.GetName())
		if _, ok := keyMap[keyFname]; !ok {
			var commit string = ""
			if msgItem.GetSourceInfo().GetLeadingComments() != "" {
				commit = msgItem.GetSourceInfo().GetLeadingComments()
			}
			msgBody = strings.ReplaceAll(msgBody, "{{Commit}}", commit)
			msgBody = strings.ReplaceAll(msgBody, "{{Name}}", msgItem.GetName())
			msgBody = strings.ReplaceAll(msgBody, "{{Data}}", strings.Join(data, "\r\n"))

			bodys = append(bodys, msgBody)
			keyMap[keyFname] = 1
		}
	}

	typesPath := filepath.Join(tsPath, "types.ts")
	utils.StringToFile(typesPath, strings.Join(bodys, "\r\n"))

}

func dispFields(fd *desc.FieldDescriptor) string {
	tpl := "    {{Name}}?: {{Type}}; {{Commit}}"

	name := strings.Trim(fd.GetName(), "")
	name = strings.ReplaceAll(name, "\t", "")
	tpl = strings.ReplaceAll(tpl, "{{Name}}", name)

	var commit string = ""
	if fd.GetSourceInfo().GetLeadingComments() != "" {
		commit = commit + fd.GetSourceInfo().GetLeadingComments() + " "
	}

	if fd.GetSourceInfo().GetTrailingComments() != "" {
		commit = commit + fd.GetSourceInfo().GetTrailingComments() + " "
	}

	if commit == "" {
		tpl = strings.ReplaceAll(tpl, "{{Commit}}", "")
	} else {
		tpl = strings.ReplaceAll(tpl, "{{Commit}}", " // "+commit)
	}

	var fdType string = ""
	switch fd.GetType().String() {
	case "TYPE_STRING":
		fdType = "string"
	case "TYPE_INT64", "TYPE_INT32", "TYPE_FLOAT32", "TYPE_FLOAT64":
		fdType = "number"
	case "bool":
		fdType = "TYPE_BOOL"
	default:
		if fd.GetLabel().String() == "LABEL_REPEATED" {
			fdType = fd.GetMessageType().GetName() + "[]"
		} else {
			fdType = fd.GetType().String()
		}
	}

	tpl = strings.ReplaceAll(tpl, "{{Type}}", fdType)

	tpl = strings.ReplaceAll(tpl, "\r\n", "")

	return tpl
}