package validator

import (
	"fmt"
)

type Validator struct {
	printMode bool
	r int
	g int
	b int
}

func NewValidator(print bool) Validator {
	return Validator{print, 0, 0, 0}
}

func (val *Validator) Calculate(x int, y int) {
	val.print("x = %d", x)
	val.print("y = %d", y)
	var u int = x - 36
	val.print("u = %d - 36 = %d", x, u)
	var v int = 18 - y
	val.print("v = 18 - %d = %d", y, v)
	var h int = u*u + v*v
	val.print("h = %d² + %d² = %d + %d = %d", u, v, u*u, v*v, h)
	if h < 200 {
		val.print("⇒ h < 200 → %d < 200", h)
		val.print("=> Continuing to section B")
		val.sectionB(u, v, h)
	} else if v < 0 {
		val.print("⇒ h < 200 → %d ≮ 200", h)
		val.print("⇒ v < 0 → %d < 0", v)
		val.print("=> Continuing to section C")
		val.sectionC(u, v, h)
	} else {
		val.print("⇒ h < 200 → %d ≮ 200", h)
		val.print("⇒ v < 0 → %d ≮ 0", v)
		val.print("=> Continuing to section D")
		val.sectionD(x, y)
	}
}

func (val *Validator) sectionB(u int, v int, h int) {
	val.r = 420
	val.print("R = %d", val.r)
	val.b = 520
	val.print("B = %d", val.b)
	var t int = 5000 + 8*h
	val.print("t = 5000 + 8 ⋅ %d = 5000 + %d = %d", h, 8*h, t)

	var p int = val.mod(t*u, 2)
	val.print("p = (%d ⋅ %d) | 2 = %d | 2 = %d", t, u, t*u, p)
	var q int = val.mod(t*v, 2)
	val.print("q = (%d ⋅ %d) | 2 = %d | 2 = %d", t, v, t*v, q)
	var s int = 2 * q
	val.print("s = 2 ⋅ %d = %d", q, s)
	var w int = val.mod(1000+p-s, 2) + 8
	val.print("w = (1000 + %d - %d) | 2 + 8 = (1000 + %d) | 2 + 8 = %d | 2 + 8 = %d + 8 = %d", p, s, p-s, 1000+p-s, val.mod(1000+p-s, 2), w)
	if w > 0 {
		val.print("⇒ w > 0 → %d > 0", w)
		val.r = val.r + w*w
		val.print("  R → R + %d² → R + %d ⇒ R = %d", w, w*w, val.r)
	}
	var o int = s + 2200
	val.print("o = %d + 2200", s)
	val.r = val.mod(val.r*o, 4)
	val.print("R → R ⋅ %d | 4 ⇒ R = %d", o, val.r)
	val.b = val.mod(val.b*o, 4)
	val.print("B → B ⋅ %d | 4 ⇒ B = %d", o, val.b)
	if p > -q {
		val.print("⇒ p > -q → %d > -%d", p, q)
		w = val.mod(p+q, 1)
		val.print("  w = (%d + %q) | 1 = %d | 1 = %d", p, q, p+q, w)
		val.r = val.r + w
		val.print("  R → R + %d ⇒ R = %d", w, val.r)
		val.b = val.b + w
		val.print("  B → B + %d ⇒ B = %d", w, val.b)
	}
	val.print("=> Continuing to section E")
	val.sectionE()
}

func (val *Validator) sectionC(u int, v int, h int) {
	val.r = 150 + 2*v
	val.print("R = 150 + 2 ⋅ %d = 150 + %d = %d", v, 2*v, val.r)
	val.b = 50
	val.print("B = %d", val.b)
	var p int = h + 8*v*v
	val.print("p = %d + 8 ⋅ %d² = %d + 8 ⋅ %d = %d + %d = %d", h, v, h, v*v, h, 8*v*v, p)
	var c int = 240*(-v) - p
	val.print("c = 240 ⋅ (-%d) - %d = %d - %d = %d", v, p, 240*(-v), p, c)
	if c > 1200 {
		val.print("⇒ c > 1200 → %d > 1200", c)
		var o int = val.mod(6*c, 1)
		val.print("  o = (6 ⋅ %d) | 1 = %d | 1 = %d", c, 6*c, o)
		o = c * (1500 - o)
		val.print("  o → %d ⋅ (1500 - o) = %d", c, o)
		o = val.mod(o, 2) - 8360
		val.print("  o → o | 2 - 8360 = %d", o)
		val.r = val.mod(val.r*o, 3)
		val.print("  R → R ⋅ %d | 3 ⇒ R = %d", o, val.r)
		val.b = val.mod(val.b*o, 3)
		val.print("  B → B ⋅ %d | 3 ⇒ B = %d", o, val.b)
	}
	var r int = c + u*v
	val.print("r = %d + %d ⋅ %d = %d + %d = %d", c, u, v, c, u*v, r)
	var d int = 3200 - h - 2*r
	val.print("d = 3200 - %d - 2 ⋅ %d = %d + %d = %d", h, r, 3200-h, 2*r, d)
	if d > 0 {
		val.print("⇒ c > 0 → %d > 0", d)
		val.r = val.r + d
		val.print("  R → R + %d ⇒ R = %d", d, val.r)
	}
	val.print("=> Continuing to section E")
	val.sectionE()
}

func (val *Validator) sectionD(x int, y int) {
	var c int = x + 4*y
	val.print("c = %d + 4 ⋅ %d", x, y)
	val.r = 132 + c
	val.print("R = 132 + %d = %d", c, val.r)
	val.b = 192 + c
	val.print("R = 192 + %d = %d", c, val.b)
	val.print("=> Continuing to section E")
	val.sectionE()
}

func (val *Validator) sectionE() {
	if val.r > 255 {
		val.r = 255
		val.print("⇒ R > 255 → R = %d", val.r)
	}
	if val.b > 255 {
		val.b = 255
		val.print("⇒ B > 255 → B = %d", val.b)
	}
	val.g = val.mod(7*val.r+3*val.b, 1)
	val.print("G = (7 + %d + 3 ⋅ %d) | 1 = (%d + %d) | 1 = %d | 1 = %d", val.r, val.b, 7+val.r, 3*val.b, 7*val.r+3*val.b, val.g)
}

func (val *Validator) mod(left int, right int) int {
	l := left
	if left < 0 {
		l = -left
	}
	for i := 0; i < right-1; i++ {
		l /= 10
	}
	r := 0
	if l%10 < 5 {
		r = l / 10
	} else {
		r = l/10 + 1
	}
	if left < 0 {
		r = -r
	}
	return r
}

func (val *Validator) GetColor() (int, int, int) {
	return val.r, val.g, val.b
}

func (val *Validator) print(str string, args... any) {
	if val.printMode {
		fmt.Printf(str + "\n", args...)
	}
}