package main

import (
	"fmt"
	"image/color"
	"machine"
	"time"

	"tinygo.org/x/drivers/ssd1306"
	"tinygo.org/x/tinyfont"
	"tinygo.org/x/tinyfont/proggy"
  "tinygo.org/x/tinyfont/freemono"
)

var (
	white = color.RGBA{R: 255, G: 255, B: 255, A: 255}
	black = color.RGBA{R: 0, G: 0, B: 0, A: 255}
)

func main() {
	// Configure I2C0 using GP4 (SDA) and GP5 (SCL) at 400kHz
	machine.I2C0.Configure(machine.I2CConfig{
		Frequency: 400 * machine.KHz,
    SDA:       machine.GP16,
    SCL:       machine.GP17,
	})

	// Initialize the display (default I2C address for SSD1306 is usually 0x3C)
	display := ssd1306.NewI2C(machine.I2C0)
	display.Configure(ssd1306.Config{
		Address: 0x3C,
		Width:   128,
		Height:  64,
	})

	display.ClearDisplay()

	// Base time for clock tracking (update to current time or set via NTP)
	currentTime := time.Date(2026, time.September, 7, 12, 0, 0, 0, time.UTC)
	ticker := time.NewTicker(1 * time.Second)

	for range ticker.C {
		currentTime = currentTime.Add(1 * time.Second)

		// Format time and date strings
		timeStr := fmt.Sprintf("%02d:%02d:%02d", currentTime.Hour(), currentTime.Minute(), currentTime.Second())
		dateStr := currentTime.Format("Mon, Jan 02 2006")

		// Clear screen buffer
		display.ClearBuffer()

		// Render text to display buffer:
		// WriteLine(target, font, x, y, text, color)
		tinyfont.WriteLine(display, &proggy.TinySZ8pt7b, 16, 14, dateStr, white)
		tinyfont.WriteLine(display, &freemono.Bold12pt7b, 6, 44, timeStr, white)

		// Push frame buffer to the OLED panel
		display.Display()
	}
}