<?php

class CRM_AnnualGrantBudgets_BAO_GrantBudget extends CRM_AnnualGrantBudgets_DAO_GrantBudget {

  /**
   * Build Fiscal year option list.
   *
   */
  public static function getFiscalyear() {
    $from = date("Y", strtotime(date('Y') . ' - ' . GRANT_SCHOLARSHIP_YEAR_DIFF . ' years'));
    $to = date("Y", strtotime(date('Y') . ' + ' . GRANT_SCHOLARSHIP_YEAR_DIFF . ' years'));
    return array_combine(range($to, $from), range($to, $from));
  }

  /**
   * Get grant budget for fiscal year and financial type.
   *
   * @param $params array
   *
   * @return array
   */
  public static function getGrantBudget($params) {
    $returnTotals = $params['return_totals'];
    $totals = [];
    $fiscalYear = $params['fiscal_year'];
    if (empty($fiscalYear)) {
      $fiscalYear = date('Y');
    }
    $grantBudget = [];
    $paidStatusID = CRM_Core_PseudoConstant::getKey(
    'CRM_Grant_DAO_Grant', 'status_id', 'Paid'
    );
    $accountRelationshipId = civicrm_api3('OptionValue', 'getvalue', [
      'return' => "value",
      'option_group_id' => "account_relationship",
      'name' => "Grant Expense Account is",
    ]);
    $config = CRM_Core_Config::singleton();
    $mkTime = mktime(0, 0, 0, $config->fiscalYearStart['M'], $config->fiscalYearStart['d'], $fiscalYear);
    $fiscalStartDate = date('Y-m-d', $mkTime);
    $fiscalEndDate = date('Y-m-d', strtotime($fiscalStartDate . '+ 1 year'));

    $qParams = [
      1 => [$fiscalYear, 'String'],
      2 => [$fiscalStartDate, 'String'],
      3 => [$fiscalEndDate, 'String'],
      4 => [$paidStatusID, 'Integer'],
      5 => [$accountRelationshipId, 'Integer'],
    ];

    $where = '';
    if (!empty($params['financial_type_id'])) {
      $where = 'WHERE cft.id = %6';
      $qParams[6] = [$params['financial_type_id'], 'Integer'];
    }

    $grantBudgetTableName = CRM_AnnualGrantBudgets_DAO_GrantBudget::getTableName();
    $sql = "SELECT cgb.id, cft.name, IFNULL(cgb.budget, 0) AS budget,
        SUM(CASE WHEN cg.id IS NULL THEN 0 ELSE IFNULL(trxn.total_amount, 0) END) as total_amount_granted,
        cft.id AS financial_type_id, cgb.note, cgb.is_reserved
      FROM civicrm_financial_type cft
        INNER JOIN " . GRANT_SCHOLARSHIP_CUSTOM_TABLE_NAME . " gs
          ON gs.entity_id = cft.id
          AND gs." . GRANT_SCHOLARSHIP_CUSTOM_FIELD . " = 1
        LEFT JOIN " . $grantBudgetTableName . " cgb
          ON cgb.financial_type_id = cft.id AND cgb.fiscal_year = %1
        LEFT JOIN civicrm_entity_financial_account cefa
          ON cefa.entity_table = 'civicrm_financial_type' AND cft.id = cefa.entity_id AND account_relationship = %5
        LEFT JOIN civicrm_financial_trxn trxn ON trxn.from_financial_account_id = cefa.financial_account_id
        LEFT JOIN civicrm_entity_financial_trxn ceft on trxn.id = ceft.financial_trxn_id AND ceft.entity_table = 'civicrm_grant'
        LEFT JOIN civicrm_grant cg
          ON cg.id = ceft.entity_id AND cg.status_id IN (%4)
          AND cg." . GRANT_DATE_CHECK_FIELD . " >= %2
          AND cg." . GRANT_DATE_CHECK_FIELD . " < %3
      {$where}
      GROUP BY cft.id
      ORDER BY cft.name";
    $result = CRM_Core_DAO::executeQuery($sql, $qParams);

    while ($result->fetch()) {
      $grantBudget[] = [
        'id' => $result->id,
        'name' => $result->name,
        'budget' => $result->budget,
        'total_amount_granted' => $result->total_amount_granted,
        'balance_amount' => $result->budget - $result->total_amount_granted,
        'financial_type_id' => $result->financial_type_id,
        'note' => $result->note,
        'is_reserved' => $result->is_reserved,
      ];
      if ($returnTotals) {
        $totals['budget'] += $result->budget;
        $totals['total_amount_granted'] += $result->total_amount_granted;
        $totals['balance_amount'] += $result->budget - $result->total_amount_granted;
      }
    }
    if ($returnTotals) {
      // Format as money.
      foreach ($totals as $k => $v) {
        $totals[$k] = CRM_Utils_Money::format($v);
      }
      return $totals;
    }
    return $grantBudget;
  }

  /**
   * Validate grant.
   *
   * @param $params array
   * @param $grantId Integer
   *
   * @return array An array of errors
   */
  public static function checkBudget($params, $grantId) {
    $year = date('Y', strtotime($params[GRANT_DATE_CHECK_FIELD]));
    foreach ($params['financial_account'] as $k => $financialAccount) {
      if (!$financialAccount) {
        break;
      }
      $financialTypeId = self::getFinancialTypeFromGrantExpenseAccount($financialAccount);
      $grantBudget = civicrm_api3('GrantBudget', 'getbudget', [
        'financial_type_id' => $financialTypeId,
        'fiscal_year' => $year,
      ])['values'][0];

      if ($grantBudget) {
        $balanceAmount = $grantBudget['balance_amount'];
        $amountGranted = $params['multifund_amount'][$k];
        // If there's a $grantId, we're updating an existing grant.  Make sure we don't
        // double-count this money on validation.
        if ($grantId) {
          $oldGrantLineItem = civicrm_api3('EntityFinancialTrxn', 'get', [
            'sequential' => 1,
            'return' => ["financial_trxn_id.total_amount", "financial_trxn_id.trxn_date"],
            'entity_table' => "civicrm_grant",
            'entity_id' => $grantId,
            'financial_trxn_id.from_financial_account_id' => $financialAccount,
          ])['values'][0];
          if ($oldGrantLineItem && $year == date('Y', strtotime($oldGrantLineItem['financial_trxn_id.trxn_date']))) {
            $amountGranted -= $oldGrantLineItem['financial_trxn_id.total_amount'];
          }
        }
        if ($balanceAmount < $amountGranted) {
          $budgetDisplay = CRM_Utils_Money::format($grantBudget['budget']);
          $totalGrantedDisplay = CRM_Utils_Money::format($grantBudget['total_amount_granted']);
          $balanceDisplay = CRM_Utils_Money::format($grantBudget['balance_amount']);
          $errors["multifund_amount[$k]"] = ts("The annual budget for this grant is $budgetDisplay. Grants totaling $totalGrantedDisplay have been made. $balanceDisplay remains.");
        }
      }
    }
    return $errors;
  }

  public static function getFinancialTypeFromGrantExpenseAccount($accountId) {
    $financialTypeId = civicrm_api3('EntityFinancialAccount', 'getvalue', [
      'return' => "entity_id",
      'account_relationship' => "Grant Expense Account is",
      'financial_account_id' => $accountId,
      'entity_table' => "civicrm_financial_type",
    ]);
    return $financialTypeId;
  }

}