import { model, models, Schema, type InferSchemaType, type Model } from "mongoose";

/**
 * Denetim kaydı (yalnızca eklenir, güncellenmez). Bölüm 7.2: hane ayarları, üye değişiklikleri,
 * silmeler, aynî borç kapatma ve mutabakat düzeltmeleri; ayrıca admin kullanıcı işlemleri.
 */
export const AUDIT_ACTIONS = [
  "household.create",
  "household.settings.update",
  "household.member.add",
  "household.member.role",
  "household.member.remove",
  "user.create",
  "user.update",
  "user.role",
  "user.password.reset",
  "user.ban",
  "user.unban",
  "user.remove",
  "account.create",
  "account.update",
  "account.archive",
  "account.unarchive",
  "account.reconcile",
  "category.archive",
  "category.unarchive",
  "category.move",
  "transaction.delete",
  "transaction.restore",
] as const;
export type AuditAction = (typeof AUDIT_ACTIONS)[number];

const auditLogSchema = new Schema(
  {
    /** Hane kapsamındaki işlemlerde dolu; sistem (admin) işlemlerinde null. */
    householdId: { type: Schema.Types.ObjectId, default: null },
    actorId: { type: Schema.Types.ObjectId, required: true },
    action: { type: String, enum: AUDIT_ACTIONS, required: true },
    targetType: { type: String, required: true },
    targetId: { type: String, required: true },
    /** Değişen alanlar: { alan: { from, to } } veya özet bilgi. Şifre vb. sır asla yazılmaz. */
    diff: { type: Schema.Types.Mixed, default: null },
    at: { type: Date, default: () => new Date() },
  },
  { collection: "auditLogs", versionKey: false },
);

auditLogSchema.index({ householdId: 1, at: -1 });
auditLogSchema.index({ actorId: 1, at: -1 });

export type AuditLog = InferSchemaType<typeof auditLogSchema>;

export const AuditLogModel: Model<AuditLog> =
  (models.AuditLog as Model<AuditLog> | undefined) ?? model<AuditLog>("AuditLog", auditLogSchema);