move EPG logic to separate file

1 files changed, 69 insertions, 0 deletions

diff --git a/epg.lua b/epg.lua
new file mode 100644
index 0000000..c7af266
--- /dev/null
+++ b/epg.lua
@@ -0,0 +1,69 @@
+-- Copyright 2025 David Vazgenovich Shakaryan
+
+local epg = {}
+local mt = {}
+mt.__index = mt
+
+function epg.new()
+	return setmetatable({channels = {}}, mt)
+end
+
+-- local (non-DST) offset from UTC
+local tz_offset
+do
+	local t = os.time()
+	tz_offset = os.time(os.date('*t', t)) - os.time(os.date('!*t', t))
+end
+
+local function parse_time(str)
+	local y, m, d, hh, mm, ss, zsign, zh, zm = str:match(
+		'(%d%d%d%d)(%d%d)(%d%d)(%d%d)(%d%d)(%d%d) ([+-])(%d%d)(%d%d)')
+	local dt = {
+		year = y, month = m, day = d,
+		hour = hh, min = mm, sec = ss, isdst = false}
+	return os.time(dt) + tz_offset -
+		(tonumber(zsign..zh) * 3600 + tonumber(zsign..zm) * 60)
+end
+
+function mt:load_xc_data(data)
+	for _, v in ipairs(data) do
+		local ch = v.channel:lower()
+		local prog = {
+			start = parse_time(v.start),
+			stop = parse_time(v.stop),
+			title = v.title,
+			desc = v.desc,
+		}
+
+		if self.channels[ch] then
+			self.channels[ch][#self.channels[ch]+1] = prog
+		else
+			self.channels[ch] = {prog}
+		end
+	end
+
+	for _, progs in pairs(self.channels) do
+		table.sort(progs, function(a, b)
+			return a.start < b.start
+		end)
+	end
+end
+
+function mt:channel_programmes(ch)
+	return self.channels[ch]
+end
+
+function mt:scheduled_programme(ch, time)
+	local progs = self.channels[ch]
+	if not progs then
+		return
+	end
+
+	for _, v in ipairs(progs) do
+		if time >= v.start and time < v.stop then
+			return v
+		end
+	end
+end
+
+return epg