OS Module

local start = os.clock()
-- Do some work
for i = 1, 1000000 do end
local elapsed = os.clock() - start
print(string.format("Elapsed: %.3f seconds", elapsed))

-- Current time
local now = os.time()
print(now)  -- 1709596800 (example)

-- Specific date/time
local t = os.time({
    year = 2024,
    month = 3,
    day = 5,
    hour = 14,
    min = 30,
    sec = 0
})
print(t)

-- Current date/time
print(os.date())  -- "Mon Mar  5 14:30:00 2024"

-- Custom format
print(os.date("%Y-%m-%d"))        -- "2024-03-05"
print(os.date("%H:%M:%S"))        -- "14:30:00"
print(os.date("%Y-%m-%d %H:%M:%S")) -- "2024-03-05 14:30:00"

-- UTC time (prefix with !)
print(os.date("!%Y-%m-%d %H:%M:%S"))

-- Date table
local t = os.date("*t")
print(t.year, t.month, t.day)
print(t.hour, t.min, t.sec)
print(t.wday)   -- Day of week (1=Sunday)
print(t.yday)   -- Day of year (1-366)
print(t.isdst)  -- Daylight saving time flag

local t1 = os.time()
-- Do some work
for i = 1, 1000000 do end
local t2 = os.time()
local diff = os.difftime(t2, t1)
print(string.format("Elapsed: %.2f seconds", diff))

-- If t1 is omitted, returns t2
print(os.difftime(100))  -- 100

-- Check if shell is available
if os.execute() then
    print("Shell available")
end

-- Execute command
local status, reason, code = os.execute("dir")
print(status, reason, code)

os.exit(0)   -- Exit with success code
os.exit(1)   -- Exit with error code

local path = os.getenv("PATH")
print(path)

local user = os.getenv("USERNAME") or os.getenv("USER")
print("User: " .. (user or "unknown"))

local temp = os.getenv("TEMP") or os.getenv("TMPDIR")
print("Temp directory: " .. (temp or "unknown"))

local ok, err = os.remove("tempfile.txt")
if ok then
    print("File deleted")
else
    print("Error: " .. err)
end

local ok, err = os.rename("old.txt", "new.txt")
if ok then
    print("File renamed")
else
    print("Error: " .. err)
end

-- Move file to different directory
os.rename("file.txt", "backup/file.txt")

local tempfile = os.tmpname()
print(tempfile)

local file = io.open(tempfile, "w")
file:write("temporary data")
file:close()

-- Clean up
os.remove(tempfile)

local current = os.setlocale()
print(current)  -- "n/a" (not fully supported)

function benchmark(func, iterations)
    local start = os.clock()
    for i = 1, iterations do
        func()
    end
    local elapsed = os.clock() - start
    return elapsed
end

local time = benchmark(function()
    local sum = 0
    for i = 1, 1000 do
        sum = sum + i
    end
end, 1000)

print(string.format("Took %.3f seconds", time))

function log(message)
    local timestamp = os.date("%Y-%m-%d %H:%M:%S")
    print(string.format("[%s] %s", timestamp, message))
end

log("Application started")
log("Processing data")
log("Application finished")

function calculateAge(birthYear, birthMonth, birthDay)
    local now = os.date("*t")
    local age = now.year - birthYear
    
    -- Adjust if birthday hasn't occurred this year
    if now.month < birthMonth or 
       (now.month == birthMonth and now.day < birthDay) then
        age = age - 1
    end
    
    return age
end

print(calculateAge(1990, 5, 15))  -- Age as of current date

function withTimeout(func, timeout)
    local start = os.clock()
    local result
    
    while os.clock() - start < timeout do
        result = func()
        if result then
            return result
        end
    end
    
    return nil, "timeout"
end

function backupFile(filename)
    local timestamp = os.date("%Y%m%d_%H%M%S")
    local backup = filename .. "." .. timestamp .. ".bak"
    
    local ok, err = os.rename(filename, backup)
    if ok then
        print("Backup created: " .. backup)
        return backup
    else
        print("Backup failed: " .. err)
        return nil
    end
end

function isFileOlderThan(filename, seconds)
    -- This requires os.execute or custom platform code
    -- Simplified example:
    local fileTime = getFileModificationTime(filename)
    local now = os.time()
    return os.difftime(now, fileTime) > seconds
end

function wait(seconds)
    local start = os.clock()
    while os.clock() - start < seconds do
        -- Busy wait (not ideal for production)
    end
end

print("Starting...")
wait(2)
print("2 seconds elapsed")

using SolarSharp.Interpreter;
using SolarSharp.Interpreter.Modules;

// Enable OS modules
var script = new Script(
    CoreModules.OS_Time |     // Time functions
    CoreModules.OS_System     // System functions (not in Unity)
);

// Platform-specific implementations
// Custom IPlatformAccessor can override default behavior