From 80629bf338766ef92cb365f0970a011cf7b08b07 Mon Sep 17 00:00:00 2001
From: Patrizio Bekerle <patrizio@bekerle.com>
Date: Wed, 25 Jul 2018 13:01:09 +0200
Subject: [PATCH] added script solar-calendar-integration

---
 solar-calendar-integration/info.json          |  10 +
 solar-calendar-integration/jalaali.js         | 238 ++++++++++++++++++
 .../solar-calendar-integration.qml            |  35 +++
 3 files changed, 283 insertions(+)
 create mode 100644 solar-calendar-integration/info.json
 create mode 100644 solar-calendar-integration/jalaali.js
 create mode 100644 solar-calendar-integration/solar-calendar-integration.qml

diff --git a/solar-calendar-integration/info.json b/solar-calendar-integration/info.json
new file mode 100644
index 0000000..92a7727
--- /dev/null
+++ b/solar-calendar-integration/info.json
@@ -0,0 +1,10 @@
+{
+  "name": "Solar (Jalaali) calendar integration",
+  "identifier": "solar-calendar-integration",
+  "script": "solar-calendar-integration.qml",
+  "resources": ["jalaali.js"],
+  "authors": ["@pbek"],
+  "version": "1.0.0",
+  "minAppVersion": "18.07.0",
+  "description" : "This script attempts to integrate the solar (Jalaali) calendar into QOwnNotes. It currently supports creating a headline for new notes with the current Jalaali date and time."
+}
diff --git a/solar-calendar-integration/jalaali.js b/solar-calendar-integration/jalaali.js
new file mode 100644
index 0000000..a76ac84
--- /dev/null
+++ b/solar-calendar-integration/jalaali.js
@@ -0,0 +1,238 @@
+
+/*
+  Converts a Gregorian date to Jalaali.
+*/
+function toJalaali(gy, gm, gd) {
+  if (Object.prototype.toString.call(gy) === '[object Date]') {
+    gd = gy.getDate()
+    gm = gy.getMonth() + 1
+    gy = gy.getFullYear()
+  }
+  return d2j(g2d(gy, gm, gd))
+}
+
+/*
+  Converts a Jalaali date to Gregorian.
+*/
+function toGregorian(jy, jm, jd) {
+  return d2g(j2d(jy, jm, jd))
+}
+
+/*
+  Checks whether a Jalaali date is valid or not.
+*/
+function isValidJalaaliDate(jy, jm, jd) {
+  return  jy >= -61 && jy <= 3177 &&
+          jm >= 1 && jm <= 12 &&
+          jd >= 1 && jd <= jalaaliMonthLength(jy, jm)
+}
+
+/*
+  Is this a leap year or not?
+*/
+function isLeapJalaaliYear(jy) {
+  return jalCal(jy).leap === 0
+}
+
+/*
+  Number of days in a given month in a Jalaali year.
+*/
+function jalaaliMonthLength(jy, jm) {
+  if (jm <= 6) return 31
+  if (jm <= 11) return 30
+  if (isLeapJalaaliYear(jy)) return 30
+  return 29
+}
+
+/*
+  This function determines if the Jalaali (Persian) year is
+  leap (366-day long) or is the common year (365 days), and
+  finds the day in March (Gregorian calendar) of the first
+  day of the Jalaali year (jy).
+
+  @param jy Jalaali calendar year (-61 to 3177)
+  @return
+    leap: number of years since the last leap year (0 to 4)
+    gy: Gregorian year of the beginning of Jalaali year
+    march: the March day of Farvardin the 1st (1st day of jy)
+  @see: http://www.astro.uni.torun.pl/~kb/Papers/EMP/PersianC-EMP.htm
+  @see: http://www.fourmilab.ch/documents/calendar/
+*/
+function jalCal(jy) {
+  // Jalaali years starting the 33-year rule.
+  var breaks =  [ -61, 9, 38, 199, 426, 686, 756, 818, 1111, 1181, 1210
+                , 1635, 2060, 2097, 2192, 2262, 2324, 2394, 2456, 3178
+                ]
+    , bl = breaks.length
+    , gy = jy + 621
+    , leapJ = -14
+    , jp = breaks[0]
+    , jm
+    , jump
+    , leap
+    , leapG
+    , march
+    , n
+    , i
+
+  if (jy < jp || jy >= breaks[bl - 1])
+    throw new Error('Invalid Jalaali year ' + jy)
+
+  // Find the limiting years for the Jalaali year jy.
+  for (i = 1; i < bl; i += 1) {
+    jm = breaks[i]
+    jump = jm - jp
+    if (jy < jm)
+      break
+    leapJ = leapJ + div(jump, 33) * 8 + div(mod(jump, 33), 4)
+    jp = jm
+  }
+  n = jy - jp
+
+  // Find the number of leap years from AD 621 to the beginning
+  // of the current Jalaali year in the Persian calendar.
+  leapJ = leapJ + div(n, 33) * 8 + div(mod(n, 33) + 3, 4)
+  if (mod(jump, 33) === 4 && jump - n === 4)
+    leapJ += 1
+
+  // And the same in the Gregorian calendar (until the year gy).
+  leapG = div(gy, 4) - div((div(gy, 100) + 1) * 3, 4) - 150
+
+  // Determine the Gregorian date of Farvardin the 1st.
+  march = 20 + leapJ - leapG
+
+  // Find how many years have passed since the last leap year.
+  if (jump - n < 6)
+    n = n - jump + div(jump + 4, 33) * 33
+  leap = mod(mod(n + 1, 33) - 1, 4)
+  if (leap === -1) {
+    leap = 4
+  }
+
+  return  { leap: leap
+          , gy: gy
+          , march: march
+          }
+}
+
+/*
+  Converts a date of the Jalaali calendar to the Julian Day number.
+
+  @param jy Jalaali year (1 to 3100)
+  @param jm Jalaali month (1 to 12)
+  @param jd Jalaali day (1 to 29/31)
+  @return Julian Day number
+*/
+function j2d(jy, jm, jd) {
+  var r = jalCal(jy)
+  return g2d(r.gy, 3, r.march) + (jm - 1) * 31 - div(jm, 7) * (jm - 7) + jd - 1
+}
+
+/*
+  Converts the Julian Day number to a date in the Jalaali calendar.
+
+  @param jdn Julian Day number
+  @return
+    jy: Jalaali year (1 to 3100)
+    jm: Jalaali month (1 to 12)
+    jd: Jalaali day (1 to 29/31)
+*/
+function d2j(jdn) {
+  var gy = d2g(jdn).gy // Calculate Gregorian year (gy).
+    , jy = gy - 621
+    , r = jalCal(jy)
+    , jdn1f = g2d(gy, 3, r.march)
+    , jd
+    , jm
+    , k
+
+  // Find number of days that passed since 1 Farvardin.
+  k = jdn - jdn1f
+  if (k >= 0) {
+    if (k <= 185) {
+      // The first 6 months.
+      jm = 1 + div(k, 31)
+      jd = mod(k, 31) + 1
+      return  { jy: jy
+              , jm: jm
+              , jd: jd
+              }
+    } else {
+      // The remaining months.
+      k -= 186
+    }
+  } else {
+    // Previous Jalaali year.
+    jy -= 1
+    k += 179
+    if (r.leap === 1)
+      k += 1
+  }
+  jm = 7 + div(k, 30)
+  jd = mod(k, 30) + 1
+  return  { jy: jy
+          , jm: jm
+          , jd: jd
+          }
+}
+
+/*
+  Calculates the Julian Day number from Gregorian or Julian
+  calendar dates. This integer number corresponds to the noon of
+  the date (i.e. 12 hours of Universal Time).
+  The procedure was tested to be good since 1 March, -100100 (of both
+  calendars) up to a few million years into the future.
+
+  @param gy Calendar year (years BC numbered 0, -1, -2, ...)
+  @param gm Calendar month (1 to 12)
+  @param gd Calendar day of the month (1 to 28/29/30/31)
+  @return Julian Day number
+*/
+function g2d(gy, gm, gd) {
+  var d = div((gy + div(gm - 8, 6) + 100100) * 1461, 4)
+      + div(153 * mod(gm + 9, 12) + 2, 5)
+      + gd - 34840408
+  d = d - div(div(gy + 100100 + div(gm - 8, 6), 100) * 3, 4) + 752
+  return d
+}
+
+/*
+  Calculates Gregorian and Julian calendar dates from the Julian Day number
+  (jdn) for the period since jdn=-34839655 (i.e. the year -100100 of both
+  calendars) to some millions years ahead of the present.
+
+  @param jdn Julian Day number
+  @return
+    gy: Calendar year (years BC numbered 0, -1, -2, ...)
+    gm: Calendar month (1 to 12)
+    gd: Calendar day of the month M (1 to 28/29/30/31)
+*/
+function d2g(jdn) {
+  var j
+    , i
+    , gd
+    , gm
+    , gy
+  j = 4 * jdn + 139361631
+  j = j + div(div(4 * jdn + 183187720, 146097) * 3, 4) * 4 - 3908
+  i = div(mod(j, 1461), 4) * 5 + 308
+  gd = div(mod(i, 153), 5) + 1
+  gm = mod(div(i, 153), 12) + 1
+  gy = div(j, 1461) - 100100 + div(8 - gm, 6)
+  return  { gy: gy
+          , gm: gm
+          , gd: gd
+          }
+}
+
+/*
+  Utility helper functions.
+*/
+
+function div(a, b) {
+  return ~~(a / b)
+}
+
+function mod(a, b) {
+  return a - ~~(a / b) * b
+}
diff --git a/solar-calendar-integration/solar-calendar-integration.qml b/solar-calendar-integration/solar-calendar-integration.qml
new file mode 100644
index 0000000..5cabd63
--- /dev/null
+++ b/solar-calendar-integration/solar-calendar-integration.qml
@@ -0,0 +1,35 @@
+import QtQml 2.0
+import QOwnNotesTypes 1.0
+
+// see: https://github.com/jalaali/jalaali-js
+import "jalaali.js" as Jalaali
+
+QtObject {
+    /**
+     * Set a headline for new notes with the current Jalaali date and time
+     */
+    function handleNewNoteHeadlineHook(headline) {
+        const date = new Date();
+
+        // { jy: 1395, jm: 1, jd: 23 }
+        const jalaaliDate = Jalaali.toJalaali(date);
+        
+        var text = "Note " + jalaaliDate.jy + "-" + pad(jalaaliDate.jm, 2) + "-" + pad(jalaaliDate.jd, 2) +
+            " " + pad(date.getHours(), 2) + "." + pad(date.getMinutes(), 2) + "." + pad(date.getSeconds(), 2);
+            
+        var underline = "\n";
+
+        // add the underline
+        for (var i = 0; i < (text.length - 1); i++) {
+            underline += "=";
+        }
+
+        return text + underline;
+    }
+
+    function pad(num, size) {
+        var s = num+"";
+        while (s.length < size) s = "0" + s;
+        return s;
+    }
+}