# @name Cryptocurrency Market
# @desc Cryptocurrency price display
# @author Avemer
# @version 1.0
class CryptocurrencyMarket

# USER VARIABLES
var COIN_ID
var TICKER
var CURRENCY
var TICKER_LETTERS
var TICKER_COLOR
var PRICE_COLOR_MODE
var PRICE_COLOR
var UPDATE_TICKS
var GAP

# INTERNAL VARIABLES
var url
var needle
var result
var oldPrice
var previousPrice
var ticks
var color
var displayTICKER
var requestActive

# ================ START OF USER SETTINGS ================
def init()
# COIN ID
# CoinGecko API ID of the cryptocurrency.
# Examples:
# bitcoin, ethereum, solana, dogecoin
self.COIN_ID = "bitcoin"

# TICKER
# Cryptocurrency ticker displayed on the screen.
# Examples:
# BTC, ETH, SOL, DOGE
self.TICKER = "BTC"

# CURRENCY
# Currency in which the cryptocurrency price is displayed.
# Examples:
# usd, eur, gbp, rub, cny
self.CURRENCY = "usd"

# NUMBER OF TICKER LETTERS DISPLAYED
# 0 = hide ticker
# 1 = first letter
# 2 = first two letters
# 3 = first three letters
# 4 = first four letters
# 5+ = full ticker
self.TICKER_LETTERS = 3

# TICKER COLOR
# Format: 0xRRGGBB
# Examples:
# 0xFFFFFF White
# 0xFF0000 Red
# 0x00FF00 Green
# 0x0000FF Blue
# 0xFFFF00 Yellow
# 0x00FFFF Cyan
# 0xFF00FF Magenta
self.TICKER_COLOR = 0xF7931A

# PRICE COLOR MODE
# 0 = always white
# 1 = custom PRICE_COLOR
# 2 = automatic green/red comparison
# Automatic mode compares the newest price
# with the previously received price.
self.PRICE_COLOR_MODE = 2

# CUSTOM PRICE COLOR
# Used when PRICE_COLOR_MODE = 1.
self.PRICE_COLOR = 0xFFFFFF

# PRICE UPDATE INTERVAL
# Number of loop ticks between requests.
# loop() runs once per second.
self.UPDATE_TICKS = 30

# DISTANCE BETWEEN TICKER AND PRICE
self.GAP = 2
# ================ END OF USER SETTINGS ================

# API URL
self.url = "https://api.coingecko.com/api/v3/simple/price?ids=" + self.COIN_ID + "&vs_currencies=" + self.CURRENCY

# FIND CURRENCY
self.needle = self.CURRENCY

# INITIAL VALUES
self.result = "..."
self.oldPrice = 0
self.previousPrice = 0
self.ticks = 0
self.color = 0xFFFFFF
self.displayTICKER = ""
self.requestActive = false

# CREATE DISPLAYED TICKER
if self.TICKER_LETTERS <= 0

self.displayTICKER = ""

elif self.TICKER_LETTERS == 1

self.displayTICKER = self.TICKER[0]

elif self.TICKER_LETTERS == 2

self.displayTICKER = self.TICKER[0] + self.TICKER[1]

elif self.TICKER_LETTERS == 3

self.displayTICKER = self.TICKER[0] + self.TICKER[1] + self.TICKER[2]

elif self.TICKER_LETTERS == 4

self.displayTICKER = self.TICKER[0] + self.TICKER[1] + self.TICKER[2] + self.TICKER[3]

else

self.displayTICKER = self.TICKER

end

end

# UPDATE COLOR
def update_color()

if self.PRICE_COLOR_MODE == 0

self.color = 0xFFFFFF
return

end

if self.PRICE_COLOR_MODE == 1

self.color = self.PRICE_COLOR
return

end

if self.PRICE_COLOR_MODE == 2

if self.previousPrice <= 0

self.color = 0xFFFFFF
return

end

if self.oldPrice > self.previousPrice

self.color = 0x00FF00

elif self.oldPrice < self.previousPrice

self.color = 0xFF0000

else

self.color = 0xFFFFFF

end

return

end

end

# PROCESS RESPONSE
def on_price(body, status)

self.requestActive = false

if body == nil

return

end

var p = re.search(
"[0-9][0-9.]*",
body
)

if p == nil

return

end

var newPrice = num(p[0])

if newPrice == nil

return

end

# SAVE PREVIOUS PRICE
if self.oldPrice > 0

self.previousPrice = self.oldPrice

end

# SAVE CURRENT PRICE
self.oldPrice = newPrice

# DISPLAY PRICE
self.result = str(newPrice)

# UPDATE COLOR
self.update_color()

# START DELAY AFTER SUCCESSFUL RESPONSE
self.ticks = self.UPDATE_TICKS

end

# MAIN LOOP
def loop()

# WAIT AFTER PREVIOUS REQUEST
if self.ticks > 0

self.ticks -= 1
return

end

# DO NOT SEND ANOTHER REQUEST
# WHILE CURRENT REQUEST IS ACTIVE
if self.requestActive

return

end

# SEND REQUEST
self.requestActive = true

http.get(
self.url,
/ b, st -> self.on_price(b, st),
{'find': self.needle, 'keep': 32}
)

end

# DRAW
def draw()

clear()

var tickerWidth = text_ink_width(self.displayTICKER)
var priceWidth = text_ink_width(self.result)

var totalWidth = tickerWidth + self.GAP + priceWidth

var x = int((width() - totalWidth) / 2)

if self.TICKER_LETTERS > 0

text(
x,
7,
self.displayTICKER,
self.TICKER_COLOR
)

end

text(
x + tickerWidth + self.GAP,
7,
self.result,
self.color
)

end

def on_button(btn)
end

end

return CryptocurrencyMarket()