import { DataTypes, Model, Optional } from 'sequelize';
import { sequelize } from '@config/database';
import { Form16CreditNote } from './Form16CreditNote';

export interface Form16SapResponseAttributes {
  id: number;
  type: 'credit';
  fileName: string;
  creditNoteId?: number | null;
  // Well-known SAP CSV columns stored as individual fields
  trnsUniqNo?: string | null;       // TRNS_UNIQ_NO  – our unique ID echoed back by SAP
  tdsTransId?: string | null;       // TDS_TRNS_ID   – credit note number echoed back (primary match key)
  claimNumber?: string | null;      // CLAIM_NUMBER  (alias / fallback)
  sapDocumentNumber?: string | null;// DOC_NO        – SAP-generated document number
  msgTyp?: string | null;           // MSG_TYP
  message?: string | null;          // MESSAGE
  docDate?: string | null;          // DOC_DATE
  tdsAmt?: string | null;           // TDS_AMT
  rawRow?: Record<string, unknown> | null; // any extra / unknown columns from the CSV
  storageUrl?: string | null;
  createdAt: Date;
  updatedAt: Date;
}

interface Form16SapResponseCreationAttributes
  extends Optional<
    Form16SapResponseAttributes,
    | 'id'
    | 'creditNoteId'
    | 'trnsUniqNo'
    | 'tdsTransId'
    | 'claimNumber'
    | 'sapDocumentNumber'
    | 'msgTyp'
    | 'message'
    | 'docDate'
    | 'tdsAmt'
    | 'rawRow'
    | 'storageUrl'
    | 'createdAt'
    | 'updatedAt'
  > {}

class Form16SapResponse
  extends Model<Form16SapResponseAttributes, Form16SapResponseCreationAttributes>
  implements Form16SapResponseAttributes
{
  public id!: number;
  public type!: 'credit';
  public fileName!: string;
  public creditNoteId?: number | null;
  public trnsUniqNo?: string | null;
  public tdsTransId?: string | null;
  public claimNumber?: string | null;
  public sapDocumentNumber?: string | null;
  public msgTyp?: string | null;
  public message?: string | null;
  public docDate?: string | null;
  public tdsAmt?: string | null;
  public rawRow?: Record<string, unknown> | null;
  public storageUrl?: string | null;
  public createdAt!: Date;
  public updatedAt!: Date;

  public creditNote?: Form16CreditNote;
}

Form16SapResponse.init(
  {
    id:               { type: DataTypes.INTEGER, autoIncrement: true, primaryKey: true },
    type:             { type: DataTypes.STRING(10), allowNull: false },
    fileName:         { type: DataTypes.STRING(255), allowNull: false, unique: true, field: 'file_name' },
    creditNoteId:     { type: DataTypes.INTEGER, allowNull: true, field: 'credit_note_id' },
    trnsUniqNo:       { type: DataTypes.STRING(200), allowNull: true, field: 'trns_uniq_no' },
    tdsTransId:       { type: DataTypes.STRING(200), allowNull: true, field: 'tds_trns_id' },
    claimNumber:      { type: DataTypes.STRING(200), allowNull: true, field: 'claim_number' },
    sapDocumentNumber:{ type: DataTypes.STRING(100), allowNull: true, field: 'sap_document_number' },
    msgTyp:           { type: DataTypes.STRING(20),  allowNull: true, field: 'msg_typ' },
    message:          { type: DataTypes.TEXT,        allowNull: true },
    docDate:          { type: DataTypes.STRING(20),  allowNull: true, field: 'doc_date' },
    tdsAmt:           { type: DataTypes.STRING(50),  allowNull: true, field: 'tds_amt' },
    rawRow:           { type: DataTypes.JSONB,       allowNull: true, field: 'raw_row' },
    storageUrl:       { type: DataTypes.STRING(500), allowNull: true, field: 'storage_url' },
    createdAt:        { type: DataTypes.DATE, allowNull: false, field: 'created_at' },
    updatedAt:        { type: DataTypes.DATE, allowNull: false, field: 'updated_at' },
  },
  {
    sequelize,
    tableName: 'form16_sap_responses',
    timestamps: true,
    underscored: true,
    createdAt: 'created_at',
    updatedAt: 'updated_at',
  }
);

Form16SapResponse.belongsTo(Form16CreditNote, {
  as: 'creditNote',
  foreignKey: 'creditNoteId',
  targetKey: 'id',
});

export { Form16SapResponse };