local function get_timedate(input)
    cities = {okla=0, anna=1, seat=-2}
    timestamp = os.epoch('local')/1000 + cities[input]*3600
    date = os.date('%B %d, %Y - %I:%M', timestamp)
    return date
end

local function temp_unit(temp, unit)
    return temp .. ' ' .. unit
end

local function get_temperature(hi, lo, current, apparent, unit)
    daily = 'High: ' .. temp_unit(hi, unit) .. ', Low: ' .. temp_unit(lo, unit)
    current = 'Current: ' ..  temp_unit(current, unit)
    apparent = 'Feels like ' .. temp_unit(apparent, unit)
    return daily, current, apparent
end

local function parse_response(input, content)
    weather_data = textutils.unserializeJSON(content)
    daily_data = weather_data['daily']
    current_data = weather_data['current']
    units = weather_data['current_units']

    cities = {okla='Oklahoma City, OK', anna='Annapolis, MD', seat='Seattle, WA'}
    city = 'City: ' .. cities[input]

    time = get_timedate(input)

    hi, lo = daily_data['temperature_2m_max'][1], daily_data['temperature_2m_min'][1]
    cur, app = current_data['temperature_2m'], current_data['apparent_temperature']
    unit = string.char(176) .. 'F'
    daily_temp, current_temp, apparent_temp = get_temperature(hi, lo, cur, app, unit)

    windspeed = 'Windspeed: ' .. current_data['wind_speed_10m'] .. ' ' .. units['wind_speed_10m']
    precip = 'Precipitation: ' .. daily_data['precipitation_sum'][1] .. ' ' .. units['precipitation']

    return {city, time, daily_temp, current_temp, apparent_temp, windspeed, precip}
end

local function display_weather(screen, weather_strings)
    screen.clear()
    for i=1, #weather_strings do
        screen.setCursorPos(1, i)
        screen.write(weather_strings[i])
    end
end

local function make_request_link(input)
    cities = {okla={35.4676, -97.5164, 'Chicago'}, anna={38.9784, -76.4921, 'New_York'}, seat={47.6062, -122.3321, 'Los_Angeles'}}
    lat = cities[input][1]
    long = cities[input][2]
    timezone = cities[input][3]
    request_link = 'https://api.open-meteo.com/v1/forecast?latitude=' .. lat .. '&longitude=' .. long .. '&current=temperature_2m,apparent_temperature,precipitation,wind_speed_10m&daily=temperature_2m_max,temperature_2m_min,precipitation_sum&temperature_unit=fahrenheit&wind_speed_unit=mph&precipitation_unit=inch&timeformat=unixtime&timezone=America%2F' .. timezone .. '&forecast_days=1'
    return request_link
end

screen = peripheral.wrap('left')
screen.setTextScale(3)

args = { ... }
request_link = make_request_link(args[1])

while true do
    resp = http.get(request_link)
    weather_strings = parse_response(args[1], resp.readAll())
    display_weather(screen, weather_strings)
    sleep(60)
end