From d291ff57284cecb510fa0428ec1888e3a458c89e Mon Sep 17 00:00:00 2001
From: Jon Goldberg <jon@megaphonetech.com>
Date: Wed, 11 Sep 2019 14:08:22 -0400
Subject: [PATCH] add invoicedata functions

---
 CRM/Tbusainvoicegen/Timebank.php  | 68 ++++++++++++++++++++++++++++---
 api/v3/Invoicegen/Generate.php    |  2 +-
 api/v3/Invoicegen/Invoicedata.php | 29 +++++++++++++
 3 files changed, 92 insertions(+), 7 deletions(-)
 create mode 100644 api/v3/Invoicegen/Invoicedata.php

diff --git a/CRM/Tbusainvoicegen/Timebank.php b/CRM/Tbusainvoicegen/Timebank.php
index 487bb8e..9abbd15 100644
--- a/CRM/Tbusainvoicegen/Timebank.php
+++ b/CRM/Tbusainvoicegen/Timebank.php
@@ -159,7 +159,7 @@ class CRM_Tbusainvoicegen_Timebank {
   private function monthsProRated() {
     // By default, we bill all 6 months in a billing period.
     $monthsProRated = 6;
-    $beginDate = $this->calculatePeriodBeginDate();
+    $beginDate = $this->calculatePeriodBeginDate(self::$billingPeriod);
     $firstAnniversary = $this->creationDate->modify("+1 year");
     $interval = $beginDate->diff($firstAnniversary);
     // First anniversary is before the billing period.
@@ -181,13 +181,14 @@ class CRM_Tbusainvoicegen_Timebank {
     if (!$this->price) {
       return;
     }
-    $dueDate = $this->calculateDueDate();
+    $dueDate = $this->calculateDueDate(self::$billingPeriod);
     civicrm_api3('Contribution', 'create', [
       'financial_type_id' => 'CW License Fee',
       'date_received' => $dueDate,
       'total_amount' => $this->price,
       'contact_id' => $this->cid,
       'contribution_status_id' => 'Pending',
+      'is_pay_later' => 1,
       self::BILLINGPERIODFIELD => self::$billingPeriod,
     ]);
   }
@@ -196,8 +197,8 @@ class CRM_Tbusainvoicegen_Timebank {
    * Returns the due date as a string.
    * @return string
    */
-  private function calculateDueDate() {
-    list($year, $number) = explode('-', self::$billingPeriod);
+  public static function calculateDueDate($billingPeriod) {
+    list($year, $number) = explode('-', $billingPeriod);
     if ($number == 1) {
       $dueDate = $year . '-03-31';
     }
@@ -212,8 +213,8 @@ class CRM_Tbusainvoicegen_Timebank {
    * This is to calculate the "new timebank" pro-rated value.
    * @return Date
    */
-  private function calculatePeriodBeginDate() {
-    list($year, $number) = explode('-', self::$billingPeriod);
+  private static function calculatePeriodBeginDate($billingPeriod) {
+    list($year, $number) = explode('-', $billingPeriod);
     if ($number == 1) {
       $beginDate = new DateTime($year . '-01-01');
     }
@@ -223,4 +224,59 @@ class CRM_Tbusainvoicegen_Timebank {
     return $beginDate;
   }
 
+  public static function calculatePeriod($billingPeriod) {
+    $beginDate = self::calculatePeriodBeginDate($billingPeriod);
+    $endDate = clone $beginDate;
+    $endDate->add(new DateInterval('P6M'))->sub(new DateInterval('P1D'));
+    $period = $beginDate->format('n/j/Y') . '-' . $endDate->format('n/j/Y');
+    return $period;
+  }
+
+  /**
+   * This is a helper function to generate values for the custom invoice template.
+   * It takes a billing period (e.g. "2019-2") and returns an array $invoiceData.
+   * $invoiceData[0] is the due date (e.g. "9/30/2019)
+   * $invoiceData[1] is the billing period (e.g. "7/1/2019-12/31/2019").
+   * $invoiceData[2] is the total amount this contact owes.
+   * @param str $billingPeriod
+   */
+  public static function invoiceData($contactId, $billingPeriod) {
+    $invoiceData[0] = self::calculateDueDate($billingPeriod);
+    $invoiceData[1] = self::calculatePeriod($billingPeriod);
+    $invoiceData[2] = self::calculateTotalDue($contactId);
+    return $invoiceData;
+  }
+
+  public static function calculateTotalDue($contactId) {
+    // Get all contributions that aren't paid, sum up their total amounts.
+    // Then get all those contributions' payments, sum up THEIR total amounts.
+    // Subtract the second number from the first.
+    $totalDue = 0;
+    $contributions = civicrm_api3('Contribution', 'get', [
+      'sequential' => 1,
+      'return' => ["total_amount"],
+      'contact_id' => $contactId,
+      'contribution_status_id' => ['!=' => "Completed"],
+      'options' => ['limit' => 0],
+    ]);
+    if ($contributions['count']) {
+      foreach ($contributions['values'] as $contribution) {
+        $totalDue += $contribution['total_amount'];
+        $contributionIds[] = $contribution['id'];
+      }
+    }
+    $payments = civicrm_api3('Payment', 'get', [
+      'sequential' => 1,
+      'contribution_id' => ['IN' => $contributionIds],
+      'options' => ['limit' => 0],
+    ]);
+    if ($payments['count']) {
+      foreach ($payments['values'] as $payment) {
+        $totalDue -= $payment['total_amount'];
+      }
+    }
+    return round($totalDue, 2);
+  }
+
 }
+
diff --git a/api/v3/Invoicegen/Generate.php b/api/v3/Invoicegen/Generate.php
index 33550c8..e0ee0fa 100644
--- a/api/v3/Invoicegen/Generate.php
+++ b/api/v3/Invoicegen/Generate.php
@@ -10,7 +10,7 @@ use CRM_Tbusainvoicegen_ExtensionUtil as E;
  * @see http://wiki.civicrm.org/confluence/display/CRMDOC/API+Architecture+Standards
  */
 function _civicrm_api3_invoicegen_Generate_spec(&$spec) {
-  $spec['contact_id']['api.required'] = 0;
+  $spec['contact_id']['api.required'] = 1;
   $spec['billing_period']['api.required'] = 1;
 }
 
diff --git a/api/v3/Invoicegen/Invoicedata.php b/api/v3/Invoicegen/Invoicedata.php
new file mode 100644
index 0000000..5b0d341
--- /dev/null
+++ b/api/v3/Invoicegen/Invoicedata.php
@@ -0,0 +1,29 @@
+<?php
+use CRM_Tbusainvoicegen_ExtensionUtil as E;
+
+/**
+ * Invoicegen.Generate API specification (optional)
+ * This is used for documentation and validation.
+ *
+ * @param array $spec description of fields supported by this API call
+ * @return void
+ * @see http://wiki.civicrm.org/confluence/display/CRMDOC/API+Architecture+Standards
+ */
+function _civicrm_api3_invoicegen_Invoicedata_spec(&$spec) {
+  $spec['contact_id']['api.required'] = 1;
+  $spec['billing_period']['api.required'] = 1;
+}
+
+/**
+ * Invoicegen.Generate API
+ *
+ * @param array $params
+ * @return array API result descriptor
+ * @see civicrm_api3_create_success
+ * @see civicrm_api3_create_error
+ * @throws API_Exception
+ */
+function civicrm_api3_invoicegen_Invoicedata($params) {
+  $returnValues = CRM_Tbusainvoicegen_Timebank::invoiceData($params['contact_id'], $params['billing_period']);
+  return civicrm_api3_create_success($returnValues, $params, 'Invoicegen', 'invoicedata');
+}