import { Model } from 'objection';
import TenantModel from 'models/TenantModel';
import { viewRolesBuilder } from 'lib/ViewRolesBuilder';

export default class Expense extends TenantModel {
  /**
   * Table name
   */
  static get tableName() {
    return 'expenses_transactions';
  }

  /**
   * Account transaction reference type.
   */
  static get referenceType() {
    return 'Expense';
  }

  /**
   * Model timestamps.
   */
  get timestamps() {
    return ['createdAt', 'updatedAt'];
  }

  /**
   * Allows to mark model as resourceable to viewable and filterable.
   */
  static get resourceable() {
    return true;
  }

  /**
   *
   */
  static get media() {
    return true;
  }

  static get virtualAttributes() {
    return ['isPublished', 'unallocatedCostAmount'];
  }

  isPublished() {
    return Boolean(this.publishedAt);
  }

  /**
   * Retrieve the unallocated cost amount.
   * @return {number}
   */
  get unallocatedCostAmount() {
    return Math.max(this.amount - this.allocatedCostAmount, 0);
  }

  /**
   * Model modifiers.
   */
  static get modifiers() {
    return {
      filterByDateRange(query, startDate, endDate) {
        if (startDate) {
          query.where('date', '>=', startDate);
        }
        if (endDate) {
          query.where('date', '<=', endDate);
        }
      },
      filterByAmountRange(query, from, to) {
        if (from) {
          query.where('amount', '>=', from);
        }
        if (to) {
          query.where('amount', '<=', to);
        }
      },
      filterByExpenseAccount(query, accountId) {
        if (accountId) {
          query.where('expense_account_id', accountId);
        }
      },
      filterByPaymentAccount(query, accountId) {
        if (accountId) {
          query.where('payment_account_id', accountId);
        }
      },
      viewRolesBuilder(query, conditionals, expression) {
        viewRolesBuilder(conditionals, expression)(query);
      },

      filterByDraft(query) {
        query.where('published_at', null);
      },

      filterByPublished(query) {
        query.whereNot('published_at', null);
      },
    };
  }

  /**
   * Relationship mapping.
   */
  static get relationMappings() {
    const Account = require('models/Account');
    const ExpenseCategory = require('models/ExpenseCategory');
    const Media = require('models/Media');

    return {
      paymentAccount: {
        relation: Model.BelongsToOneRelation,
        modelClass: Account.default,
        join: {
          from: 'expenses_transactions.paymentAccountId',
          to: 'accounts.id',
        },
      },
      categories: {
        relation: Model.HasManyRelation,
        modelClass: ExpenseCategory.default,
        join: {
          from: 'expenses_transactions.id',
          to: 'expense_transaction_categories.expenseId',
        },
      },
      media: {
        relation: Model.ManyToManyRelation,
        modelClass: Media.default,
        join: {
          from: 'expenses_transactions.id',
          through: {
            from: 'media_links.model_id',
            to: 'media_links.media_id',
          },
          to: 'media.id',
        },
        filter(query) {
          query.where('model_name', 'Expense');
        },
      },
    };
  }

  /**
   * Model defined fields.
   */
  static get fields() {
    return {
      payment_date: {
        label: 'Payment date',
        column: 'payment_date',
        columnType: 'date',
      },
      payment_account: {
        label: 'Payment account',
        column: 'payment_account_id',
        relation: 'accounts.id',
        optionsResource: 'account',
      },
      amount: {
        label: 'Amount',
        column: 'total_amount',
        columnType: 'number',
      },
      currency_code: {
        label: 'Currency',
        column: 'currency_code',
        optionsResource: 'currency',
      },
      reference_no: {
        label: 'Reference No.',
        column: 'reference_no',
        columnType: 'string',
      },
      description: {
        label: 'Description',
        column: 'description',
        columnType: 'string',
      },
      published: {
        label: 'Published',
        column: 'published_at',
      },
      status: {
        label: 'Status',
        options: [
          { key: 'draft', label: 'Draft' },
          { key: 'published', label: 'Published' },
        ],
        query: (query, role) => {
          switch (role.value) {
            case 'draft':
              query.modify('filterByDraft');
              break;
            case 'published':
              query.modify('filterByPublished');
              break;
          }
        },
        sortQuery(query, role) {
          query.modify('sortByStatus', role.order);
        },
      },
      created_at: {
        label: 'Created at',
        column: 'created_at',
        columnType: 'date',
      },
    };
  }
}