import mongoose from 'mongoose';
import { generateId } from '../../utils.js';
const { Schema } = mongoose;
import { aggregateRollups, aggregateRollupsHistory, editObject } from '../../database.js';

const invoiceOrderItemSchema = new Schema(
  {
    orderItem: { type: Schema.Types.ObjectId, ref: 'orderItem', required: true },
    taxRate: { type: Schema.Types.ObjectId, ref: 'taxRate', required: false },
    invoiceAmountWithTax: { type: Number, required: true, default: 0 },
    invoiceAmount: { type: Number, required: true, default: 0 },
    invoiceQuantity: { type: Number, required: true, default: 0 },
  },
  { timestamps: true }
);

const invoiceShipmentSchema = new Schema(
  {
    shipment: { type: Schema.Types.ObjectId, ref: 'shipment', required: true },
    taxRate: { type: Schema.Types.ObjectId, ref: 'taxRate', required: false },
    invoiceAmountWithTax: { type: Number, required: true, default: 0 },
    invoiceAmount: { type: Number, required: true, default: 0 },
  },
  { timestamps: true }
);

const invoiceSchema = new Schema(
  {
    _reference: { type: String, default: () => generateId()() },
    totalAmount: { type: Number, required: true, default: 0 },
    totalAmountWithTax: { type: Number, required: true, default: 0 },
    shippingAmount: { type: Number, required: true, default: 0 },
    shippingAmountWithTax: { type: Number, required: true, default: 0 },
    grandTotalAmount: { type: Number, required: true, default: 0 },
    totalTaxAmount: { type: Number, required: true, default: 0 },
    from: { type: Schema.Types.ObjectId, ref: 'vendor', required: false },
    to: { type: Schema.Types.ObjectId, ref: 'client', required: false },
    state: {
      type: { type: String, required: true, default: 'draft' },
    },
    orderType: { type: String, required: true },
    order: { type: Schema.Types.ObjectId, refPath: 'orderType', required: true },
    issuedAt: { type: Date, required: false },
    dueAt: { type: Date, required: false },
    postedAt: { type: Date, required: false },
    acknowledgedAt: { type: Date, required: false },
    paidAt: { type: Date, required: false },
    cancelledAt: { type: Date, required: false },
    invoiceOrderItems: [invoiceOrderItemSchema],
    invoiceShipments: [invoiceShipmentSchema],
  },
  { timestamps: true }
);

const rollupConfigs = [
  {
    name: 'draft',
    filter: { 'state.type': 'draft' },
    rollups: [
      { name: 'draftCount', property: 'state.type', operation: 'count' },
      { name: 'draftGrandTotalAmount', property: 'grandTotalAmount', operation: 'sum' },
    ],
  },
  {
    name: 'sent',
    filter: { 'state.type': 'sent' },
    rollups: [
      { name: 'sentCount', property: 'state.type', operation: 'count' },
      { name: 'sentGrandTotalAmount', property: 'grandTotalAmount', operation: 'sum' },
    ],
  },
  {
    name: 'acknowledged',
    filter: { 'state.type': 'acknowledged' },
    rollups: [
      { name: 'acknowledgedCount', property: 'state.type', operation: 'count' },
      { name: 'acknowledgedGrandTotalAmount', property: 'grandTotalAmount', operation: 'sum' },
    ],
  },
  {
    name: 'partiallyPaid',
    filter: { 'state.type': 'partiallyPaid' },
    rollups: [
      { name: 'partiallyPaidCount', property: 'state.type', operation: 'count' },
      { name: 'partiallyPaidGrandTotalAmount', property: 'grandTotalAmount', operation: 'sum' },
    ],
  },
  {
    name: 'paid',
    filter: { 'state.type': 'paid' },
    rollups: [{ name: 'paidCount', property: 'state.type', operation: 'count' }],
  },
  {
    name: 'overdue',
    filter: { 'state.type': 'overdue' },
    rollups: [{ name: 'overdueCount', property: 'state.type', operation: 'count' }],
  },
  {
    name: 'cancelled',
    filter: { 'state.type': 'cancelled' },
    rollups: [{ name: 'cancelledCount', property: 'state.type', operation: 'count' }],
  },
];

invoiceSchema.statics.stats = async function () {
  const results = await aggregateRollups({
    model: this,
    rollupConfigs: rollupConfigs,
  });

  // Transform the results to match the expected format
  return results;
};

invoiceSchema.statics.history = async function (from, to) {
  const results = await aggregateRollupsHistory({
    model: this,
    startDate: from,
    endDate: to,
    rollupConfigs: rollupConfigs,
  });

  // Return time-series data array
  return results;
};

invoiceSchema.statics.recalculate = async function (invoice, user) {
  const invoiceId = invoice._id || invoice;
  if (!invoiceId) {
    return;
  }

  // Calculate totals from invoiceOrderItems
  let totalAmount = 0;
  for (const item of invoice.invoiceOrderItems || []) {
    totalAmount += Number.parseFloat(item.invoiceAmount) || 0;
  }
  let totalAmountWithTax = 0;
  for (const item of invoice.invoiceOrderItems || []) {
    totalAmountWithTax += Number.parseFloat(item.invoiceAmountWithTax) || 0;
  }

  // Calculate shipping totals from invoiceShipments
  let shippingAmount = 0;
  for (const item of invoice.invoiceShipments || []) {
    shippingAmount += Number.parseFloat(item.invoiceAmount) || 0;
  }
  let shippingAmountWithTax = 0;
  for (const item of invoice.invoiceShipments || []) {
    shippingAmountWithTax += Number.parseFloat(item.invoiceAmountWithTax) || 0;
  }

  // Calculate grand total and tax amount
  const grandTotalAmount = parseFloat(totalAmountWithTax) + parseFloat(shippingAmountWithTax);
  const totalTaxAmount =
    parseFloat(totalAmountWithTax) -
    parseFloat(totalAmount) +
    (parseFloat(shippingAmountWithTax) - parseFloat(shippingAmount));

  const updateData = {
    totalAmount: parseFloat(totalAmount).toFixed(2),
    totalAmountWithTax: parseFloat(totalAmountWithTax).toFixed(2),
    shippingAmount: parseFloat(shippingAmount).toFixed(2),
    shippingAmountWithTax: parseFloat(shippingAmountWithTax).toFixed(2),
    grandTotalAmount: parseFloat(grandTotalAmount).toFixed(2),
    totalTaxAmount: parseFloat(totalTaxAmount).toFixed(2),
  };

  await editObject({
    model: this,
    id: invoiceId,
    updateData,
    user,
    recalculate: false,
  });
};

// Add virtual id getter
invoiceSchema.virtual('id').get(function () {
  return this._id;
});

// Configure JSON serialization to include virtuals
invoiceSchema.set('toJSON', { virtuals: true });

// Create and export the model
export const invoiceModel = mongoose.model('invoice', invoiceSchema);