//go:build windows

package hiedabke_kardianos_svc_logger

import (
	"fmt"
	"git.swzry.com/zry/GoHiedaLogger/hiedalog"
	"golang.org/x/sys/windows/svc/eventlog"
	"strings"
)

type WinEventLogBackend struct {
	WinLog *eventlog.Log
	enable bool
}

var _ = hiedalog.HiedaLogBackend(&WinEventLogBackend{WinLog: nil})

func NewWinEventLogBackend(logger *eventlog.Log) *WinEventLogBackend {
	scb := &WinEventLogBackend{
		WinLog: logger,
		enable: true,
	}
	return scb
}

func (b *WinEventLogBackend) Shutdown() {
	b.enable = false
	_ = b.WinLog.Close()
}

func (b *WinEventLogBackend) EmitStringLog(module string, level hiedalog.HiedaLogLevel, content string) {
	if !b.enable {
		return
	}
	msg := fmt.Sprintf("<%s> [%s] %s\n", level.Name, module, content)
	switch {
	case level.LevelNumber < 3:
		{
			_ = b.WinLog.Error(uint32(level.LevelNumber)+1, msg)
			break
		}
	case level.LevelNumber == 3:
		{
			_ = b.WinLog.Warning(uint32(level.LevelNumber)+1, msg)
			break
		}
	case level.LevelNumber >= 4:
		{
			_ = b.WinLog.Info(uint32(level.LevelNumber)+1, msg)
			break
		}
	}
}

func (b *WinEventLogBackend) EmitComplexLog(module string, level hiedalog.HiedaLogLevel, data map[string]string) {
	if !b.enable {
		return
	}
	b.EmitStringLog(module, level, b.prettyComplexToString(data))
}

func (b *WinEventLogBackend) prettyComplexToString(data map[string]string) string {
	sb := strings.Builder{}
	scn := 0
	xr := false
	if len(data) < 5 {
		for k, v := range data {
			scn += len(k) + len(v) + 2
			if scn > 160 {
				xr = true
				break
			}
			sb.WriteString(k)
			sb.WriteRune(':')
			sb.WriteString(v)
			sb.WriteString(", ")
		}
		if !xr {
			so := sb.String()
			return so[:len(so)-2]
		}
	}
	sb = strings.Builder{}
	sb.WriteRune('\n')
	for k, v := range data {
		sb.WriteString(k)
		sb.WriteRune(':')
		sb.WriteString(v)
		sb.WriteRune('\n')
	}
	return sb.String()
}