From c482fac42513e03c2b2f457f9ade2f1cf186d0df Mon Sep 17 00:00:00 2001
From: "E. Almqvist" <elalmqvist@gmail.com>
Date: Tue, 8 Dec 2020 07:16:36 +0100
Subject: [PATCH] Day 8

---
 2020/8.py | 129 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 129 insertions(+)
 create mode 100755 2020/8.py

diff --git a/2020/8.py b/2020/8.py
new file mode 100755
index 0000000..0425b48
--- /dev/null
+++ b/2020/8.py
@@ -0,0 +1,129 @@
+#!/usr/bin/env python
+
+from aoc import get_input # AoC
+import re # regex
+from copy import copy
+
+CodeLines = get_input(8).splitlines()
+print(CodeLines)
+
+def parseCode(code):
+    if( code and code != "" ):
+        regex = r"^([a-z]{3}) ([\+\-]{1})([0-9]+)$"
+        op, sign, num = re.match(regex, code).groups()
+
+        return op, sign, int(num)
+    else:
+        print("INVALID CODE:", code)
+        return
+
+
+accu = 0
+line = 0
+
+def runCode(op, sign, num, newline=line, newaccu=accu):
+    if( op == "nop" ):
+        newline += 1
+    elif( op == "acc" ):
+        if( sign == "+" ):
+            newaccu += num
+        elif( sign == "-" ):
+            newaccu -= num
+
+        newline += 1
+    elif( op == "jmp" ):
+        if( sign == "+" ):
+            newline += num
+        elif( sign == "-" ):
+            newline -= num
+
+    return newline, newaccu
+
+
+def swapCode(line, codes):
+    op, sign, num = parseCode(codes[line])
+    newcode = ""
+
+    if( op == "nop" ):
+        newcode = f"jmp {sign}{num}"
+    elif( op == "jmp" ):
+        newcode = f"nop {sign}{num}"
+    else:
+        return codes[line]
+
+    return newcode
+
+
+def runProgram(codes=CodeLines, i=0, linefix=None, linecode=None, oldline=None):
+    print(f"\nRunning program iter:{i}")
+    print(f"Codes: {codes}")
+    seenLines = []
+    codeLen = len(codes)
+
+    line = 0
+    accu = 0
+
+    loop = False
+
+    while True:
+        try:
+            if( not loop ):
+                if( line < codeLen ):
+                    code = codes[line]
+                    op, sign, num = parseCode(code)
+
+                    newline, newaccu = runCode(op, sign, num, line, accu)
+
+                    print(f"op:{op} num:{sign}{num} line:{line}/{codeLen} newline:{newline}/{codeLen} accu:{accu} newaccu:{newaccu}")
+
+                    if(newline in seenLines):
+                        print(f"REPEAT AT: line:{line} newline:{newline} newaccu:{newaccu} seenLines:{seenLines}")
+
+                        if( op == "jmp" ):
+                            loop = True
+                            print("LOOP")
+
+                    seenLines.append(newline)
+                    accu = newaccu
+                    line = newline
+
+                else:
+                    print("END OF PROGRAM")
+                    print(accu, line)
+                    return accu, line, codeLen
+            else:
+                print("BAD LOOP")
+                break
+        except:
+            print(f"ERROR line:{line} maxline:{codeLen}")
+            print(accu)
+            return accu, line, codeLen
+
+count = 0
+
+jmpThings = dict()
+
+for l in range(len(CodeLines)):
+    code = CodeLines[l]
+    newcodes = CodeLines
+    op, sign, num = parseCode(code)
+
+    if( op == "nop" or op == "jmp" ):
+        jmpThings[l] = (op, sign, num)
+
+print(jmpThings) # Need to change one of these
+
+for codeline, ins in jmpThings.items():
+    print("\n\n####")
+    newcodes = copy(CodeLines)
+    newcodes[codeline] = swapCode(codeline, CodeLines)
+    print(f"newcodes:{newcodes} | {newcodes[codeline]}")
+    print(f"oldcodes:{CodeLines} | {CodeLines[codeline]}")
+
+    out = runProgram(newcodes)
+    print(f"OUT:{out}")
+    if( out ):
+        print("############ OUT:", out)
+        break
+    else:
+        continue