package utils

import (
	"context"
	"reflect"
	"strings"

	"github.com/Caknoooo/go-gin-clean-starter/database/entities"
	"github.com/Caknoooo/go-gin-clean-starter/pkg/constants"
	"github.com/google/uuid"
)

func GetInitials(name string) string {
	name = strings.TrimSpace(name)
	words := strings.Fields(name)
	if len(words) == 0 {
		return ""
	}
	if len(words) == 1 {
		// Jika hanya satu kata, ambil 3 huruf awal (atau kurang jika <3)
		initial := words[0]
		if len(initial) > 3 {
			initial = initial[:3]
		}
		return strings.ToUpper(initial)
	}
	// Jika lebih dari satu kata, ambil huruf pertama tiap kata
	var initials string
	for _, w := range words {
		if len(w) > 0 {
			initials += string(w[0])
		}
	}
	return strings.ToUpper(initials)
}

func GetUserID(ctx context.Context) string {
	val := ctx.Value(constants.USERID)
	if id, ok := val.(string); ok {
		return id
	}
	return ""
}

func GetWarehouseID(ctx context.Context) string {
	val := ctx.Value(constants.WAREHOUSEID)
	if id, ok := val.(string); ok {
		return id
	}
	return ""
}

func FillAuditTrail(ctx context.Context, action string) entities.FullAuditTrail {
	userID := GetUserID(ctx)
	uid, _ := uuid.Parse(userID)
	audit := entities.Audit{}
	switch action {
	case "create":
		audit.CreatedBy = uid
	case "update":
		audit.UpdatedBy = uid
	case "delete":
		audit.DeletedBy = uid
	}
	return entities.FullAuditTrail{Audit: audit}
}

func GetChangedFields(before, after interface{}) map[string]map[string]interface{} {
	changes := make(map[string]map[string]interface{})
	vBefore := reflect.ValueOf(before)
	vAfter := reflect.ValueOf(after)
	t := vBefore.Type()

	for i := 0; i < vBefore.NumField(); i++ {
		field := t.Field(i).Name
		if field == "FullAuditTrail" {
			continue
		}
		valBefore := vBefore.Field(i).Interface()
		valAfter := vAfter.Field(i).Interface()
		if !reflect.DeepEqual(valBefore, valAfter) {
			changes[field] = map[string]interface{}{
				"old": valBefore,
				"new": valAfter,
			}
		}
	}
	return changes
}