package aplicare

import (
	"encoding/json"
	"fmt"
	"os"
	"time"
)

type SyncLog struct {
	Timestamp  string `json:"timestamp"`
	KodeRuang  string `json:"kode_ruang,omitempty"`
	NamaRuang  string `json:"nama_ruang,omitempty"`
	KodeKelas  string `json:"kode_kelas,omitempty"`
	Kapasitas  int    `json:"kapasitas,omitempty"`
	Tersedia   int    `json:"tersedia,omitempty"`
	Action     string `json:"action"`
	Status     string `json:"status"`
	Error      string `json:"error,omitempty"`
	ResponseMs int64  `json:"response_ms,omitempty"`
}

var logPath = "./logs/sync.log"

func init() {
	_ = os.MkdirAll("./logs", 0755)
}

// WriteLog menulis 1 entry log ke sync.log
func WriteLog(entry SyncLog) {
	entry.Timestamp = time.Now().Format(time.RFC3339)
	writeToFile(entry)
}

// WriteBatchLog menulis ringkasan 1 run sync
func WriteBatchLog(result *SyncResult) {
	if result == nil {
		return
	}

	status := "sukses"
	if len(result.Errors) > 0 {
		status = "partial"
	}
	if result.Posted == 0 && result.Changed > 0 {
		status = "gagal"
	}

	summary := map[string]interface{}{
		"timestamp":   time.Now().Format(time.RFC3339),
		"action":      "batch_sync",
		"total_rooms": result.TotalRooms,
		"changed":     result.Changed,
		"posted":      result.Posted,
		"dry_run":     result.DryRun,
		"status":      status,
		"errors":      result.Errors,
	}

	f, err := os.OpenFile(logPath, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
	if err != nil {
		return
	}
	defer f.Close()

	line, _ := json.Marshal(summary)
	_, _ = f.Write(append(line, '\n'))

	// Rotasi log — jaga ukuran file max 5MB
	rotateLogs()
}

func writeToFile(entry SyncLog) {
	f, err := os.OpenFile(logPath, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
	if err != nil {
		fmt.Printf("gagal buka log file: %v\n", err)
		return
	}
	defer f.Close()

	line, _ := json.Marshal(entry)
	_, _ = f.Write(append(line, '\n'))
}

// rotateLogs — kalau file > 5MB, rename jadi sync.log.old
func rotateLogs() {
	info, err := os.Stat(logPath)
	if err != nil {
		return
	}

	// 5MB
	if info.Size() > 5*1024*1024 {
		_ = os.Rename(logPath, logPath+".old")
	}
}