package day01

import (
	"adventofcode2025/utils"
	"fmt"
	"strings"
)

type Dir int

const (
	Left Dir = iota
	Right
	Safe
	Unsafe
)

type Instruction struct {
	Turn  Dir
	Steps int
}

func Part1(input string) int {
	lines := strings.Split(input, "\n")
	position := 50
	code := 0
	Instructions := make([]Instruction, 0)
	for _, line := range lines {
		var steps int
		var dir Dir
		switch line[0] {
		case 'L':
			steps = utils.MustAtoi(line[1:])
			dir = Left
		case 'R':
			steps = utils.MustAtoi(line[1:])
			dir = Right
		default:
			fmt.Println("Invalid direction")
			continue
		}
		if steps > 100 {
			steps = steps % 100
		}
		Instructions = append(Instructions, Instruction{Turn: dir, Steps: steps})
	}
	fmt.Print(Instructions)
	for _, instr := range Instructions {
		if instr.Turn == Left {
			if position-instr.Steps < 0 {
				position = 100 + (position - instr.Steps)
			} else {
				position -= instr.Steps
			}
		} else if instr.Turn == Right {
			if position+instr.Steps >= 100 {
				position = (position + instr.Steps) - 100
			} else {
				position += instr.Steps
			}
		}
		fmt.Println("\n", instr.Turn, instr.Steps, "->", position)
		if position == 0 {
			code++
		}
	}
	return code
}

func Part2(input string) int {
	lines := strings.Split(input, "\n")
	position := 50
	code := 0
	Instructions := make([]Instruction, 0)
	for _, line := range lines {
		var steps int
		var dir Dir
		switch line[0] {
		case 'L':
			steps = utils.MustAtoi(line[1:])
			dir = Left
		case 'R':
			steps = utils.MustAtoi(line[1:])
			dir = Right
		default:
			fmt.Println("Invalid direction")
			continue
		}
		Instructions = append(Instructions, Instruction{Turn: dir, Steps: steps})
	}
	fmt.Print(Instructions)
	for _, instr := range Instructions {
		if instr.Steps > 100 {
			code = code + (instr.Steps / 100)
			instr.Steps = instr.Steps % 100
		}
		if instr.Turn == Left {
			if position-instr.Steps < 0 {
				if position != 0 {
					code++
				}
				position = 100 + (position - instr.Steps)
				
			} else {
				position -= instr.Steps
				if position == 0 {
					code++
				}
			}
		} else if instr.Turn == Right {
			if position+instr.Steps > 99 {
				if position != 0 {
					code++
				}
				position = (position + instr.Steps) - 100
			} else {
				position += instr.Steps
				if position == 0 {
					code++
				}
			}
		}

		fmt.Println("\n", instr.Turn, instr.Steps, "->", position, "code:", code)

	}
	return code
}