From fbca7a64fa5ec0cd36d876a59a927571d9e865b9 Mon Sep 17 00:00:00 2001
From: Dirk Sohler <dirk@0x7be.de>
Date: Tue, 19 Feb 2019 13:40:19 +0100
Subject: [PATCH] implement timezone offset configuration

---
 init.lua                     |  1 +
 locale/mtimer.de.tr          |  7 +++++++
 system/formspec_creation.lua | 32 ++++++++++++++++++++++++++++++++
 system/on_receive_fields.lua | 13 +++++++++++++
 4 files changed, 53 insertions(+)

diff --git a/init.lua b/init.lua
index d241f3b..7ffeb74 100644
--- a/init.lua
+++ b/init.lua
@@ -9,6 +9,7 @@ mtimer = {
         visible = { key = 'mtimer:visible', default = 'true' },
         position = { key = 'mtimer:position', default = 'bl' },
         color = { key = 'mtimer:color', default = '#ffffffFF' },
+        timezone_offset = { key = 'mtimer:timezone_offset', default = '0' },
     }
 }
 
diff --git a/locale/mtimer.de.tr b/locale/mtimer.de.tr
index 219f052..ea3b066 100644
--- a/locale/mtimer.de.tr
+++ b/locale/mtimer.de.tr
@@ -24,6 +24,13 @@ Click the position you want to place the timer at.=Auf die Stelle klicken, an de
 mTimer Color=mTimer-Farbe
 Use `@1` format only!=Ausschließlich `@1`-Format benutzen!
 
+# Timezone Offset
+mTimer Timezone Offset=mTimer-Zeitzonenunterschied
+30 minutes @= 0.5, 60 minutes @= 1=30 Minuten @= 0.5, 60 Minuten @= 1
+“Arbitrary” values are possible.=Es sind „beliebige“ Werte möglich.
+Server Time: @1=Serverzeit: @1
+Local Time: @1=Lokale Zeit: @1
+
 # Generic Formspec Strings
 Default=Standard
 Exit=Verlassen
diff --git a/system/formspec_creation.lua b/system/formspec_creation.lua
index 351aa67..d5621f4 100644
--- a/system/formspec_creation.lua
+++ b/system/formspec_creation.lua
@@ -12,6 +12,9 @@ local build_frame = function (width, height, title)
     container_end[]
     ]]
 
+    local width = width < 6 and 6 or width
+    local height = height < 2 and 2 or height
+
     return formspec_frame:gsub('%+%a+', {
         ['+width'] = width,
         ['+height'] = height,
@@ -94,3 +97,32 @@ mtimer.show_formspec.set_color = function (player_name)
     label[-0.05,1.45;]]..S('Use `@1` format only!', hexcolor)..[[]
     ]])
 end
+
+
+mtimer.show_formspec.timezone_offset = function (player_name)
+    local player = minetest.get_player_by_name(player_name)
+    local offset = player:get_meta():get_string(m.meta.timezone_offset.key)
+
+    local server_timestamp = os.time()
+    local local_timestamp = server_timestamp + ((offset*60)*60)
+    local server_time = os.date('%Y-%m-%dT%T', server_timestamp)
+    local local_time = os.date('%Y-%m-%dT%T', local_timestamp)
+
+    local format_information = table.concat({
+        S('30 minutes @= 0.5, 60 minutes @= 1'),
+        S('“Arbitrary” values are possible.')
+    }, '\n')
+
+    local time_information = table.concat({
+        S('Server Time: @1', server_time),
+        S('Local Time: @1', local_time)
+    }, '\n')
+
+    minetest.show_formspec(player_name, 'mtimer:timezone_offset',
+    build_frame(7, 3, S('mTimer Timezone Offset'))..[[
+    field_close_on_enter[offset;false]
+    field[0.25,0.75;3,1;offset;;]]..offset..[[]
+    label[3,0.425;]]..format_information..[[]
+    label[0,1.45;]]..time_information..[[]
+    ]])
+end
diff --git a/system/on_receive_fields.lua b/system/on_receive_fields.lua
index 74afd7b..975410b 100644
--- a/system/on_receive_fields.lua
+++ b/system/on_receive_fields.lua
@@ -11,6 +11,7 @@ minetest.register_on_player_receive_fields(function(player, formname, fields)
         if fields.set_visibility then f.set_visibility(name) end
         if fields.set_position then f.set_position(name) end
         if fields.set_color then f.set_color(name) end
+        if fields.timezone_offset then f.timezone_offset(name) end
     end
 
 
@@ -53,6 +54,18 @@ minetest.register_on_player_receive_fields(function(player, formname, fields)
     end
 
 
+    -- Configure timezone offset
+    if formname == 'mtimer:timezone_offset' then
+        local attr = m.meta.timezone_offset
+        local value = tonumber(fields.offset) or attr.default
+        if math.abs(value) > os.time() then value = 0 end
+        meta:set_string(attr.key, value)
+        if fields.default then meta:set_string(attr.key, attr.default) end
+        if not fields.quit then mtimer.show_formspec.timezone_offset(name) end
+    end
+
+
+
     -- Back to menu from all formspecs
     if fields.main_menu then f.main_menu(name) end