import {
  DataTypes,
  Model,
  CreationOptional,
  ValidationErrorItem,
  Op,
  ValidationError,
} from "sequelize";
import { sequelize } from "./index";
import { InvoiceInterface } from "../shared/interfaces/invoice.interface";
import User from "./users";
import InvoiceDetail from "./invoicedetail";

class Invoice extends Model<InvoiceInterface> implements InvoiceInterface {
  declare id?: number;
  declare reference_number: string;
  declare invoice_number: string;
  declare vendor_name: string;
  declare invoice_date: Date;
  declare total: number;
  declare amount_paid: number;
  declare due_date?: Date;
  declare term?: string;
  declare description?: string;
  declare payment_status?: string;
  declare pw_work_order_id?: number;
  declare pw_vendor_id?: number;
  declare filename?: string;
  declare pdf_url?: string;
  declare status: string;
  declare uploaded_by: number;
  declare InvoiceDetails: InvoiceDetail[];
}

Invoice.init(
  {
    id: {
      type: DataTypes.INTEGER,
      autoIncrement: true,
      primaryKey: true,
    },
    reference_number: {
      type: DataTypes.STRING(100),
    },
    invoice_number: {
      type: DataTypes.STRING(100),
    },
    vendor_name: {
      type: DataTypes.STRING(255),
    },
    invoice_date: {
      type: DataTypes.DATE,
    },
    total: {
      type: DataTypes.DECIMAL(10, 2),
    },
    amount_paid: {
      type: DataTypes.DECIMAL(10, 2),
    },
    due_date: {
      type: DataTypes.DATE,
      allowNull: true,
    },
    term: {
      type: DataTypes.STRING(50),
      allowNull: true,
    },
    description: {
      type: DataTypes.TEXT,
      allowNull: true,
    },
    payment_status: {
      type: DataTypes.STRING(50),
      defaultValue: "pending",
    },
    pw_work_order_id: {
      type: DataTypes.INTEGER,
      allowNull: true,
    },
    pw_vendor_id: {
      type: DataTypes.INTEGER,
      allowNull: true,
    },
    filename: {
      type: DataTypes.STRING(255),
      allowNull: false,
    },
    pdf_url: {
      type: DataTypes.STRING(255),
      allowNull: true,
    },
    status: {
      type: DataTypes.STRING(50),
      allowNull: false,
    },
    uploaded_by: {
      type: DataTypes.INTEGER,
      allowNull: false,
    },
  },
  {
    sequelize,
    tableName: "invoices",
    underscored: true,
    freezeTableName: true,
    timestamps: true,
    createdAt: "created_at",
    updatedAt: "updated_at",
    paranoid: true,
    deletedAt: "deleted_at",
  }
);

Invoice.belongsTo(User, { foreignKey: "uploaded_by", as: "uploadedBy" });
Invoice.hasMany(InvoiceDetail, { foreignKey: "invoice_id" });

const validateInvoice = async (invoice: Invoice) => {
  const existingInvoice = await Invoice.findOne({
    where: {
      reference_number: invoice.reference_number,
      status: { [Op.ne]: "archived" },
      id: { [Op.ne]: invoice.id },
    },
  });

  const validationErrorItems: ValidationErrorItem[] = [];

  if (existingInvoice) {
    validationErrorItems.push(
      new ValidationErrorItem(
        "Invoice with the same reference number already exists; archive it before adding another.",
        "unique violation",
        "reference_number",
        invoice.reference_number,
        invoice,
        "isUnique",
        "reference_number",
        []
      )
    );
  }

  if (validationErrorItems.length > 0) {
    throw new ValidationError("Validation Error", validationErrorItems);
  }
};

Invoice.addHook("beforeCreate", validateInvoice);
Invoice.addHook("beforeUpdate", validateInvoice);
Invoice.addHook("beforeSave", validateInvoice);

export default Invoice;