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# Day Five: Sunny with a Chance of Asteroids
import os, strutils, sequtils
let input: string = paramStr(1)
var program: seq[int] = map(split(strip(readFile(input)), ','), parseInt)
var i: int = 0
while i < len(program):
let opcode: int = program[i] mod 100
var
mode: int = program[i] div 100
one: int = i+1
two: int = i+2
three: int = i+3
if len(program)-i > 1 and mode mod 10 == 0:
one = program[one]
if len(program)-i > 2 and mode div 10 mod 10 == 0:
two = program[two]
if len(program)-i > 3 and mode div 100 == 0:
three = program[three]
case opcode
of 1: # adds
program[three] = program[one] + program[two]
i += 4
of 2: # multiplies
program[three] = program[one] * program[two]
i += 4
of 3: # input
write(stdout, "Input: ")
program[one] = parseInt(readLine(stdin))
i += 2
of 4: # output
echo program[one]
i += 2
of 5: # jump-if-true
if program[one] != 0:
i = program[two]
else:
i += 3
of 6: # jump-if-false
if program[one] == 0:
i = program[two]
else:
i += 3
of 7: # less than
if program[one] < program[two]:
program[three] = 1
else:
program[three] = 0
i += 4
of 8: # equals
if program[one] == program[two]:
program[three] = 1
else:
program[three] = 0
i += 4
of 99: # terminate
break
else:
echo("Unsupported code ", program[i], " at ", i)
quit(QuitFailure)
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