package layout_test

import (
	"testing"
	"time"

	"git.eeqj.de/sneak/hdmistat/internal/fbdraw"
	"git.eeqj.de/sneak/hdmistat/internal/layout"
)

// ExampleScreen shows how to create a screen that implements FrameGenerator
type ExampleScreen struct {
	name string
	fps  float64
}

func (s *ExampleScreen) GenerateFrame(grid *fbdraw.CharGrid) error {
	// Create a draw context with the grid dimensions
	draw := layout.NewDraw(grid.Width, grid.Height)
	
	// Clear the screen
	draw.Clear()
	
	// Draw a title
	draw.Color(layout.Color("cyan")).Size(16).Bold()
	draw.TextCenter(0, 2, "Example Screen: %s", s.name)
	
	// Create a grid for structured layout
	contentGrid := draw.Grid(5, 5, 70, 20)
	contentGrid.Border(layout.Color("gray50"))
	
	// Add some content
	contentGrid.Color(layout.Color("white")).WriteCenter(1, "Current Time: %s", time.Now().Format("15:04:05"))
	
	// Draw a progress bar
	contentGrid.Color(layout.Color("green")).Bar(10, 5, 50, 75.0, layout.Color("green"))
	
	// Add system stats
	contentGrid.Color(layout.Color("yellow")).Write(2, 8, "CPU: %.1f%%", 42.5)
	contentGrid.Color(layout.Color("orange")).Write(2, 9, "Memory: %s / %s", layout.Bytes(4*1024*1024*1024), layout.Bytes(16*1024*1024*1024))
	
	// Return the rendered grid
	*grid = *draw.Render()
	return nil
}

func (s *ExampleScreen) FramesPerSecond() float64 {
	return s.fps
}

func TestExampleUsage(t *testing.T) {
	// Create carousel with terminal display for testing
	display := fbdraw.NewTerminalDisplay(80, 25)
	carousel := fbdraw.NewCarousel(display, 5*time.Second)
	
	// Add screens
	carousel.AddScreen(&ExampleScreen{name: "Dashboard", fps: 1.0})
	carousel.AddScreen(&ExampleScreen{name: "System Monitor", fps: 2.0})
	carousel.AddScreen(&ExampleScreen{name: "Network Stats", fps: 0.5})
	
	// In a real application, you would run this in a goroutine
	// ctx := context.Background()
	// go carousel.Run(ctx)
}