package generate

import (
	"fmt"
	"math"
	"math/rand"
	"os"
	"testing"
)

var canvas *Deck

const (
	lorem    = `Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.`
	hellogo  = "package main\nimport \"fmt\"\nfunc main() {\n    fmt.Println(\"hello, world\")\n}"
	hellorun = "$ go run hello.go\nhello, world"
	rgbfmt   = `rgb(%d,%d,%d)`
)

// randp returns a random float
func randp(n float64) float64 {
	x := math.Ceil(rand.Float64() * n)
	if x == 0 {
		return 1
	}
	return x
}

// rp returns n random coordinates radiating from (cx, cy)
func rp(cx, cy, size float64, np int) ([]float64, []float64) {
	adiv := 360.0 / float64(np)
	rx := make([]float64, np)
	ry := make([]float64, np)
	a := 0.0
	for i := 0; i < np; i++ {
		t := a * (math.Pi / 180)
		r := randp(size)
		rx[i] = (r * math.Cos(t)) + cx
		ry[i] = (r * math.Sin(t)) + cy
		a += adiv
	}
	return rx, ry
}

func TestMain(m *testing.M) {
	f, err := os.Create("decktest.xml")
	if err != nil {
		fmt.Fprintf(os.Stderr, "%v\n", err)
		os.Exit(1)
	}
	canvas = NewSlides(f, 0, 0)
	m.Run()
}

func BenchmarkEmptyDoc(b *testing.B) {
	canvas.StartDeck()
	canvas.EndDeck()
}

func BenchmarkEmptySlide(b *testing.B) {
	canvas.StartDeck()
	canvas.StartSlide()
	canvas.EndSlide()
	canvas.EndDeck()
}

func BenchmarkHello(b *testing.B) {
	canvas.StartDeck()
	canvas.StartSlide("black", "white")
	canvas.Circle(50, 0, 100, "blue")
	canvas.Text(50, 25, "hello, world", "sans", 10, "")
	canvas.EndSlide()
	canvas.EndDeck()
}

func BenchmarkList(b *testing.B) {
	items := []string{"One", "Two", "Three", "Four", "Five", "Six", "Seven"}
	canvas.StartDeck()
	canvas.StartSlide()
	canvas.Text(10, 90, "Important Items", "sans", 5, "")
	canvas.List(10, 70, 4, 0, 0, items, "bullet", "sans", "red")
	canvas.EndSlide()
	canvas.EndDeck()

}

func BenchmarkCircle(b *testing.B) {
	canvas.StartSlide()
	for i := 0; i < b.N; i++ {
		canvas.Circle(100, 100, 10, "red", 100)
	}
	canvas.EndSlide()
}

func BenchmarkEllipse(b *testing.B) {
	canvas.StartSlide()
	for i := 0; i < b.N; i++ {
		canvas.Ellipse(100, 100, 10, 10, "red", 100)
	}
	canvas.EndSlide()
}

func BenchmarkSquare(b *testing.B) {
	canvas.StartSlide()
	for i := 0; i < b.N; i++ {
		canvas.Square(100, 100, 10, "red", 100)
	}
	canvas.EndSlide()
}

func BenchmarkRect(b *testing.B) {
	canvas.StartSlide()
	for i := 0; i < b.N; i++ {
		canvas.Rect(100, 100, 10, 10, "red", 100)
	}
	canvas.EndSlide()
}

func BenchmarkArc(b *testing.B) {
	canvas.StartSlide()
	for i := 0; i < b.N; i++ {
		canvas.Arc(100, 100, 10, 10, 0.5, 90, 300, "red", 100)
	}
	canvas.EndSlide()
}

func BenchmarkCurve(b *testing.B) {
	canvas.StartSlide()
	for i := 0; i < b.N; i++ {
		canvas.Curve(100, 100, 100, 100, 100, 100, 0.5, "red", 100)
	}
	canvas.EndSlide()
}

func BenchmarkLine(b *testing.B) {
	canvas.StartSlide()
	for i := 0; i < b.N; i++ {
		x := 100.0
		y := 100.0
		if i%2 == 0 {
			canvas.Line(x, y, x+10, y, 0.5, "red", 100)
		} else {
			canvas.Line(x, y, x, y+10, 0.5, "red", 100)
		}
	}
	canvas.EndSlide()
}

func BenchmarkPolygon(b *testing.B) {
	canvas.StartSlide()
	for i := 0; i < b.N; i++ {
		px, py := rp(100, 100, 10, 5)
		canvas.Polygon(px, py, "red", 100)
	}
	canvas.EndSlide()
}

func BenchmarkImage(b *testing.B) {
	canvas.StartSlide("gray")
	y := 50.0
	for x := 20.0; x < 90.0; x += 20.0 {
		canvas.Image(x, y, 100, 100, "sm.png", "")
	}
	canvas.EndSlide()
}

func BenchmarkText(b *testing.B) {
	// Text Block
	canvas.StartSlide("rgb(180,180,180)")
	canvas.TextBlock(10, 90, lorem, "sans", 2.5, 30, "black")
	canvas.TextBlock(10, 50, lorem, "sans", 2.5, 50, "gray")
	canvas.TextBlock(10, 20, lorem, "sans", 2.5, 75, "white")
	canvas.EndSlide()

	// Text alignment
	canvas.StartSlide("rgb(180,180,180)")
	canvas.Text(50, 80, "left", "sans", 10, "black")
	canvas.TextMid(50, 50, "center", "serif", 10, "gray")
	canvas.TextEnd(50, 20, "right", "mono", 10, "white")
	canvas.Line(50, 100, 50, 0, 0.2, "black", 20)
	canvas.TextRotate(50, 50, "rotate", "", "sans", 45, 10, "red")
	canvas.EndSlide()

	// Code
	canvas.StartSlide("rgb(180,180,180)")
	canvas.Code(35, 80, "$ edit hello.go", 2, 40, "rgb(0,0,127)")
	canvas.Code(35, 70, hellogo, 2, 40, "black")
	canvas.Code(35, 39, hellorun, 2, 40, "rgb(127,0,0)")
	canvas.EndSlide()
}