// Daily Glitch Wallpaper Generator
// Generates 6 unique glitch-inspired wallpapers at Pixel 8 resolution (1080x2400)
// Each run produces different art via randomized parameters and algorithm selection.
//
// Usage: go run daily.go [output-dir]

package main

import (
	"fmt"
	"image"
	"image/color"
	"image/png"
	"math"
	"math/rand"
	"os"
	"path/filepath"
	"time"
)

const (
	W = 1080
	H = 2400
)

func main() {
	rand.Seed(time.Now().UnixNano())

	outDir := "daily-output"
	if len(os.Args) > 1 {
		outDir = os.Args[1]
	}
	os.MkdirAll(outDir, 0755)

	// Pool of generators — pick 6 unique ones (or repeat with different params if pool < 6)
	type Generator struct {
		Name string
		Draw func(img *image.RGBA, w, h int)
	}

	generators := []Generator{
		{"ghost-in-the-machine", drawGhost},
		{"pixel-aurora", drawAurora},
		{"data-rain", drawDataRain},
		{"fractal-burn", drawFractalBurn},
		{"void-signal", drawVoidSignal},
		{"neon-decay", drawNeonDecay},
		{"static-portrait", drawStaticPortrait},
		{"circuit-dream", drawCircuitDream},
		{"plasma-tear", drawPlasmaTear},
		{"bit-cascade", drawBitCascade},
		{"deep-scan", drawDeepScan},
		{"entropy-wave", drawEntropyWave},
	}

	// Shuffle and pick 6
	rand.Shuffle(len(generators), func(i, j int) {
		generators[i], generators[j] = generators[j], generators[i]
	})

	for i := 0; i < 6; i++ {
		gen := generators[i]
		img := image.NewRGBA(image.Rect(0, 0, W, H))
		gen.Draw(img, W, H)

		name := fmt.Sprintf("%02d-%s.png", i+1, gen.Name)
		path := filepath.Join(outDir, name)
		f, err := os.Create(path)
		if err != nil {
			fmt.Fprintf(os.Stderr, "error: %v\n", err)
			continue
		}
		png.Encode(f, img)
		f.Close()
		fmt.Printf("✓ %s\n", path)
	}
	fmt.Println("\n🎪 Done!")
}

func clamp(v float64) uint8 {
	if v < 0 {
		return 0
	}
	if v > 255 {
		return 255
	}
	return uint8(v)
}

func lerpColor(a, b color.RGBA, t float64) color.RGBA {
	return color.RGBA{
		clamp(float64(a.R)*(1-t) + float64(b.R)*t),
		clamp(float64(a.G)*(1-t) + float64(b.G)*t),
		clamp(float64(a.B)*(1-t) + float64(b.B)*t),
		255,
	}
}

func fillBg(img *image.RGBA, w, h int, top, bot color.RGBA) {
	for y := 0; y < h; y++ {
		t := float64(y) / float64(h)
		c := lerpColor(top, bot, t)
		for x := 0; x < w; x++ {
			img.SetRGBA(x, y, c)
		}
	}
}

func addScanlines(img *image.RGBA, w, h int, intensity float64) {
	for y := 0; y < h; y += 2 + rand.Intn(3) {
		a := intensity * (0.5 + rand.Float64()*0.5)
		for x := 0; x < w; x++ {
			c := img.RGBAAt(x, y)
			c.R = clamp(float64(c.R) * (1 - a))
			c.G = clamp(float64(c.G) * (1 - a))
			c.B = clamp(float64(c.B) * (1 - a))
			img.SetRGBA(x, y, c)
		}
	}
}

func addGlitchBars(img *image.RGBA, w, h int, count int) {
	for i := 0; i < count; i++ {
		barY := rand.Intn(h)
		barH := 1 + rand.Intn(4)
		shift := rand.Intn(30) - 15
		tint := []color.RGBA{
			{255, 0, 80, 255}, {0, 255, 200, 255}, {200, 0, 255, 255}, {255, 200, 0, 255},
		}[rand.Intn(4)]
		a := 0.1 + rand.Float64()*0.25

		for dy := 0; dy < barH; dy++ {
			yy := barY + dy
			if yy >= h {
				break
			}
			for x := 0; x < w; x++ {
				sx := x + shift
				if sx < 0 || sx >= w {
					continue
				}
				c := img.RGBAAt(sx, yy)
				c.R = clamp(float64(c.R)*(1-a) + float64(tint.R)*a)
				c.G = clamp(float64(c.G)*(1-a) + float64(tint.G)*a)
				c.B = clamp(float64(c.B)*(1-a) + float64(tint.B)*a)
				img.SetRGBA(x, yy, c)
			}
		}
	}
}

// === GENERATORS ===

func drawGhost(img *image.RGBA, w, h int) {
	fillBg(img, w, h, color.RGBA{3, 3, 12, 255}, color.RGBA{10, 8, 30, 255})
	cx := float64(w) / 2
	startY := float64(h) * 0.12
	fh := float64(h) * 0.70
	n := w * 120
	for i := 0; i < n; i++ {
		t := float64(i) / float64(n)
		sway := math.Sin(t*22+rand.Float64()*0.5) * float64(w) * (0.08 - t*0.05)
		spread := math.Sin(t*math.Pi) * float64(w) * 0.12
		px := int(cx + sway + (rand.Float64()-0.5)*spread*2)
		py := int(startY + t*fh + (rand.Float64()-0.5)*4)
		if px < 0 || px >= w || py < 0 || py >= h {
			continue
		}
		alpha := (1 - t) * 0.85
		if rand.Float64() > 0.96 {
			for dx := -8; dx < 15+rand.Intn(w/12); dx++ {
				sx := px + dx
				if sx >= 0 && sx < w {
					img.SetRGBA(sx, py, color.RGBA{clamp(255 * alpha), 0, clamp(100 * alpha), 255})
				}
			}
		} else {
			img.SetRGBA(px, py, color.RGBA{clamp(150 * alpha), clamp(200 * alpha), clamp(255 * alpha), 255})
		}
	}
	addScanlines(img, w, h, 0.04)
	addGlitchBars(img, w, h, 6)
}

func drawAurora(img *image.RGBA, w, h int) {
	phase1 := rand.Float64() * math.Pi * 2
	phase2 := rand.Float64() * math.Pi * 2
	freq := 0.003 + rand.Float64()*0.004

	fillBg(img, w, h, color.RGBA{2, 2, 15, 255}, color.RGBA{5, 3, 20, 255})
	for y := 0; y < h; y++ {
		fy := float64(y) / float64(h)
		// Aurora bands in the upper portion
		bandIntensity := math.Exp(-math.Pow((fy-0.3)/0.25, 2))
		for x := 0; x < w; x++ {
			fx := float64(x)
			wave1 := math.Sin(fx*freq+phase1+fy*3) * 0.5
			wave2 := math.Cos(fx*freq*1.7+phase2+fy*2) * 0.3
			v := (wave1 + wave2 + 0.5) * bandIntensity

			tear := 0.0
			if math.Sin(fy*80+fx*0.01) > 0.97 {
				tear = 0.4
			}

			r := clamp(v*80 + tear*200)
			g := clamp(v * 255)
			b := clamp(v*180 + tear*100)

			c := img.RGBAAt(x, y)
			c.R = clamp(float64(c.R) + float64(r))
			c.G = clamp(float64(c.G) + float64(g))
			c.B = clamp(float64(c.B) + float64(b))
			img.SetRGBA(x, y, c)
		}
	}
	// Stars
	for i := 0; i < 400; i++ {
		px, py := rand.Intn(w), rand.Intn(h/2)
		b := uint8(100 + rand.Intn(155))
		img.SetRGBA(px, py, color.RGBA{b, b, b, 255})
	}
	addGlitchBars(img, w, h, 4)
}

func drawDataRain(img *image.RGBA, w, h int) {
	baseHue := rand.Float64() // randomize color each run
	fillBg(img, w, h, color.RGBA{0, 0, 0, 255}, color.RGBA{5, 5, 10, 255})
	cols := w / 8
	for c := 0; c < cols; c++ {
		x := c*8 + rand.Intn(4)
		speed := 3 + rand.Intn(8)
		startOff := rand.Intn(h)
		length := 40 + rand.Intn(120)
		for i := 0; i < length; i++ {
			y := (startOff + i*speed) % h
			t := float64(i) / float64(length)
			brightness := (1 - t) * 0.9

			// HSV-ish color from baseHue
			r := clamp(math.Sin(baseHue*math.Pi*2)*100*brightness + 50*brightness)
			g := clamp(math.Sin((baseHue+0.33)*math.Pi*2)*100*brightness + 200*brightness)
			b := clamp(math.Sin((baseHue+0.66)*math.Pi*2)*100*brightness + 80*brightness)

			for dx := 0; dx < 3; dx++ {
				if x+dx < w {
					img.SetRGBA(x+dx, y, color.RGBA{r, g, b, 255})
				}
			}
		}
	}
	addScanlines(img, w, h, 0.06)
	addGlitchBars(img, w, h, 10)
}

func drawFractalBurn(img *image.RGBA, w, h int) {
	cx := float64(w)/2 + rand.Float64()*100 - 50
	cy := float64(h)/2 + rand.Float64()*200 - 100
	maxIter := 80 + rand.Intn(40)
	zoom := 200.0 + rand.Float64()*200

	palette := []color.RGBA{
		{20, 0, 40, 255}, {80, 0, 120, 255}, {200, 50, 50, 255},
		{255, 150, 0, 255}, {255, 255, 100, 255}, {255, 255, 255, 255},
	}

	for y := 0; y < h; y++ {
		for x := 0; x < w; x++ {
			zr := (float64(x) - cx) / zoom
			zi := (float64(y) - cy) / zoom
			cr, ci := zr, zi
			iter := 0
			for ; iter < maxIter; iter++ {
				zr2, zi2 := zr*zr, zi*zi
				if zr2+zi2 > 4 {
					break
				}
				zr, zi = zr2-zi2+cr, 2*zr*zi+ci
			}
			t := float64(iter) / float64(maxIter)
			idx := t * float64(len(palette)-1)
			i1 := int(idx)
			if i1 >= len(palette)-1 {
				i1 = len(palette) - 2
			}
			frac := idx - float64(i1)

			// Burn effect — occasional pixel corruption
			if (x*131+y*97+iter*3)%200 < 3 {
				img.SetRGBA(x, y, color.RGBA{255, 255, 255, 255})
			} else {
				img.SetRGBA(x, y, lerpColor(palette[i1], palette[i1+1], frac))
			}
		}
	}
	addGlitchBars(img, w, h, 8)
}

func drawVoidSignal(img *image.RGBA, w, h int) {
	fillBg(img, w, h, color.RGBA{0, 0, 0, 255}, color.RGBA{0, 0, 5, 255})
	ringCx := float64(w)/2 + rand.Float64()*60 - 30
	ringCy := float64(h)*0.4 + rand.Float64()*100

	for y := 0; y < h; y++ {
		for x := 0; x < w; x++ {
			dist := math.Hypot(float64(x)-ringCx, float64(y)-ringCy)
			ring := math.Sin(dist*0.04) * 0.5 * math.Exp(-dist*0.001)
			noise := float64((x*9871+y*6563)%256) / 256.0

			v := ring*0.8 + noise*0.05

			// Color: deep teal to white
			r := clamp(v * 150)
			g := clamp(v * 255)
			b := clamp(v * 280)
			img.SetRGBA(x, y, color.RGBA{r, g, b, 255})
		}
	}
	addScanlines(img, w, h, 0.08)
	addGlitchBars(img, w, h, 12)
}

func drawNeonDecay(img *image.RGBA, w, h int) {
	neonColors := []color.RGBA{
		{255, 0, 110, 255}, {0, 255, 200, 255}, {130, 50, 255, 255},
		{255, 200, 0, 255}, {0, 150, 255, 255},
	}
	pick := neonColors[rand.Intn(len(neonColors))]
	pick2 := neonColors[rand.Intn(len(neonColors))]

	fillBg(img, w, h, color.RGBA{8, 5, 15, 255}, color.RGBA{15, 8, 25, 255})

	// Neon lines that decay
	for l := 0; l < 30+rand.Intn(20); l++ {
		y := rand.Intn(h)
		thickness := 2 + rand.Intn(6)
		c := pick
		if rand.Float64() > 0.5 {
			c = pick2
		}
		decayStart := rand.Intn(w / 2)
		for x := 0; x < w; x++ {
			alpha := 1.0
			if x > decayStart {
				decay := float64(x-decayStart) / float64(w-decayStart)
				alpha = 1 - decay
				// Chunk decay — blocks disappear
				if ((x/8)*17+l*31)%10 < int(decay*10) {
					continue
				}
			}
			for dy := 0; dy < thickness; dy++ {
				yy := y + dy
				if yy < h {
					img.SetRGBA(x, yy, color.RGBA{
						clamp(float64(c.R) * alpha),
						clamp(float64(c.G) * alpha),
						clamp(float64(c.B) * alpha),
						255,
					})
				}
			}
		}
	}
	addScanlines(img, w, h, 0.03)
}

func drawStaticPortrait(img *image.RGBA, w, h int) {
	// TV static with a silhouette carved out
	for y := 0; y < h; y++ {
		for x := 0; x < w; x++ {
			v := uint8(rand.Intn(60))
			img.SetRGBA(x, y, color.RGBA{v, v, v, 255})
		}
	}
	// Silhouette — oval head + body
	headCx, headCy := float64(w)/2, float64(h)*0.28
	headRx, headRy := float64(w)*0.12, float64(w)*0.15
	bodyCx, bodyCy := float64(w)/2, float64(h)*0.65
	bodyRx, bodyRy := float64(w)*0.22, float64(h)*0.3

	for y := 0; y < h; y++ {
		for x := 0; x < w; x++ {
			fx, fy := float64(x), float64(y)
			inHead := math.Pow((fx-headCx)/headRx, 2)+math.Pow((fy-headCy)/headRy, 2) < 1
			inBody := math.Pow((fx-bodyCx)/bodyRx, 2)+math.Pow((fy-bodyCy)/bodyRy, 2) < 1
			if inHead || inBody {
				img.SetRGBA(x, y, color.RGBA{0, 0, 0, 255})
			}
		}
	}
	// Glitch the silhouette edges
	addGlitchBars(img, w, h, 15)
	addScanlines(img, w, h, 0.1)
}

func drawCircuitDream(img *image.RGBA, w, h int) {
	accent := []color.RGBA{
		{0, 255, 180, 255}, {0, 150, 255, 255}, {255, 100, 0, 255},
	}[rand.Intn(3)]

	fillBg(img, w, h, color.RGBA{5, 10, 15, 255}, color.RGBA{10, 15, 25, 255})

	// Grid of circuit-like paths
	gridSize := 20 + rand.Intn(20)
	for gy := 0; gy < h/gridSize; gy++ {
		for gx := 0; gx < w/gridSize; gx++ {
			if rand.Float64() > 0.3 {
				continue
			}
			x1 := gx * gridSize
			y1 := gy * gridSize
			// Draw horizontal or vertical trace
			horizontal := rand.Float64() > 0.5
			length := gridSize * (1 + rand.Intn(4))
			thick := 1 + rand.Intn(2)
			alpha := 0.3 + rand.Float64()*0.7

			for d := 0; d < length; d++ {
				for t := 0; t < thick; t++ {
					var px, py int
					if horizontal {
						px, py = x1+d, y1+t
					} else {
						px, py = x1+t, y1+d
					}
					if px >= 0 && px < w && py >= 0 && py < h {
						img.SetRGBA(px, py, color.RGBA{
							clamp(float64(accent.R) * alpha),
							clamp(float64(accent.G) * alpha),
							clamp(float64(accent.B) * alpha),
							255,
						})
					}
				}
			}
			// Node dot at start
			for dx := -2; dx <= 2; dx++ {
				for dy := -2; dy <= 2; dy++ {
					px, py := x1+dx, y1+dy
					if px >= 0 && px < w && py >= 0 && py < h {
						img.SetRGBA(px, py, accent)
					}
				}
			}
		}
	}
	addGlitchBars(img, w, h, 5)
}

func drawPlasmaTear(img *image.RGBA, w, h int) {
	p1 := rand.Float64() * 10
	p2 := rand.Float64() * 10
	p3 := rand.Float64() * 10

	for y := 0; y < h; y++ {
		for x := 0; x < w; x++ {
			fx := float64(x) / float64(w) * 8
			fy := float64(y) / float64(h) * 8

			v1 := math.Sin(fx*1.5 + p1)
			v2 := math.Sin(fy*2.0 + p2)
			v3 := math.Sin((fx+fy)*1.2 + p3)
			v4 := math.Sin(math.Hypot(fx-4, fy-4) * 1.5)

			v := (v1 + v2 + v3 + v4) / 4.0

			r := clamp((v*0.5 + 0.5) * 255)
			g := clamp((math.Sin(v*math.Pi)*0.5 + 0.5) * 200)
			b := clamp(((1-v)*0.5 + 0.5) * 255)

			// Tear: horizontal displacement
			if math.Sin(float64(y)*0.05) > 0.92 {
				shift := int(math.Sin(float64(y)*0.3) * 40)
				nx := x + shift
				if nx >= 0 && nx < w {
					img.SetRGBA(nx, y, color.RGBA{r, g, b, 255})
				}
			} else {
				img.SetRGBA(x, y, color.RGBA{r, g, b, 255})
			}
		}
	}
	addScanlines(img, w, h, 0.05)
}

func drawBitCascade(img *image.RGBA, w, h int) {
	shift := rand.Intn(8)
	fillBg(img, w, h, color.RGBA{0, 0, 0, 255}, color.RGBA{0, 0, 10, 255})

	for y := 0; y < h; y++ {
		for x := 0; x < w; x++ {
			bx, by := x>>2, y>>2
			v1 := (bx ^ by) >> shift
			v2 := (bx & by)
			v3 := (bx | by) * 3

			r := uint8((v1 * 13) % 256)
			g := uint8((v2 * 7) % 256)
			b := uint8((v3 * 5) % 256)

			// Cascade: progressive corruption downward
			corruptChance := float64(y) / float64(h)
			if rand.Float64() < corruptChance*0.02 {
				r, g, b = 255-r, 255-g, 255-b
			}

			img.SetRGBA(x, y, color.RGBA{r, g, b, 255})
		}
	}
	addGlitchBars(img, w, h, int(float64(h)*0.005))
}

func drawDeepScan(img *image.RGBA, w, h int) {
	scanY := rand.Float64()
	accent := []color.RGBA{
		{0, 255, 100, 255}, {255, 50, 50, 255}, {50, 100, 255, 255},
	}[rand.Intn(3)]

	fillBg(img, w, h, color.RGBA{0, 0, 0, 255}, color.RGBA{5, 5, 8, 255})

	// Horizontal bands of data
	for y := 0; y < h; y++ {
		fy := float64(y) / float64(h)
		bandDist := math.Abs(fy - scanY)
		intensity := math.Exp(-bandDist * 8)

		for x := 0; x < w; x++ {
			noise := float64((x*3571+y*2819)%256) / 256.0
			v := intensity * (0.5 + noise*0.5)

			r := clamp(float64(accent.R) * v)
			g := clamp(float64(accent.G) * v)
			b := clamp(float64(accent.B) * v)

			// Data blocks
			if intensity > 0.3 && (x/6+y/3)%4 == 0 {
				r = clamp(float64(r) * 2)
				g = clamp(float64(g) * 2)
				b = clamp(float64(b) * 2)
			}

			img.SetRGBA(x, y, color.RGBA{r, g, b, 255})
		}
	}
	addScanlines(img, w, h, 0.06)
	addGlitchBars(img, w, h, 8)
}

func drawEntropyWave(img *image.RGBA, w, h int) {
	seed1 := rand.Float64() * 100
	seed2 := rand.Float64() * 100
	palette := []color.RGBA{
		{uint8(rand.Intn(256) | 128), uint8(rand.Intn(128)), uint8(rand.Intn(256)), 255},
		{uint8(rand.Intn(128)), uint8(rand.Intn(256) | 128), uint8(rand.Intn(256)), 255},
		{uint8(rand.Intn(256)), uint8(rand.Intn(128)), uint8(rand.Intn(256) | 128), 255},
	}

	for y := 0; y < h; y++ {
		for x := 0; x < w; x++ {
			fx := float64(x)/float64(w)*6 + seed1
			fy := float64(y)/float64(h)*6 + seed2

			v := math.Sin(fx*2)*math.Cos(fy*3) +
				math.Sin((fx+fy)*1.5)*0.5 +
				math.Cos(fx*fy*0.3)*0.3

			// Normalize -ish to 0..1
			v = v*0.3 + 0.5
			if v < 0 {
				v = 0
			}
			if v > 1 {
				v = 1
			}

			idx := v * float64(len(palette)-1)
			i1 := int(idx)
			if i1 >= len(palette)-1 {
				i1 = len(palette) - 2
			}
			frac := idx - float64(i1)

			c := lerpColor(palette[i1], palette[i1+1], frac)

			// Entropy: increasing noise toward bottom
			entropy := float64(y) / float64(h)
			if rand.Float64() < entropy*0.08 {
				c.R ^= uint8(rand.Intn(256))
				c.G ^= uint8(rand.Intn(256))
				c.B ^= uint8(rand.Intn(256))
			}

			img.SetRGBA(x, y, c)
		}
	}
	addGlitchBars(img, w, h, 6)
}

func rand_Intn(n int) uint8 {
	return uint8(rand.Intn(n))
}