From e6a4d314d70cd751154c6371b56a5b5b5a0bfc13 Mon Sep 17 00:00:00 2001
From: Dece <shgck@pistache.land>
Date: Mon, 9 Dec 2019 23:03:48 +0100
Subject: [PATCH] Day 9

---
 2019/day9.py    |  6 +++++
 2019/intcode.py | 58 +++++++++++++++++++++++--------------------------
 2 files changed, 33 insertions(+), 31 deletions(-)

diff --git a/2019/day9.py b/2019/day9.py
index 556a304..982805d 100644
--- a/2019/day9.py
+++ b/2019/day9.py
@@ -9,9 +9,15 @@ EX3 = "104,1125899906842624,99"
 def main():
     with open("day9.txt", "rt") as input_file:
         text = input_file.readlines()[0].rstrip()
+    
     codes = Intcode.parse_input(text)
+
+    # Part 1
     Intcode(codes, print_output=True).run([1])
 
+    # Part 2
+    Intcode(codes, print_output=True).run([2])
+
 
 if __name__ == "__main__":
     main()
diff --git a/2019/intcode.py b/2019/intcode.py
index b97c133..738c9ca 100644
--- a/2019/intcode.py
+++ b/2019/intcode.py
@@ -25,7 +25,7 @@ class PMode(IntEnum):
 
 class Intcode(object):
 
-    def __init__(self, program, print_output=False):
+    def __init__(self, program, print_output=False, debug=False):
         self._memory = program.copy()
         self.ip = 0
         self.rel_base = 0
@@ -35,23 +35,22 @@ class Intcode(object):
         self.halt = False
         self.outputs = []
         self.print_output = print_output
+        self.debug = debug
 
     @staticmethod
     def parse_input(text):
         return [int(i) for i in text.rstrip().split(",")]
     
+    def log(self, message, *args):
+        if self.debug:
+            print("debug:", message, *args)
+    
     def run(self, inputs=None):
         self.inputs = inputs or []
         handlers = self.get_handlers()
         while not self.halt:
             self.read_code()
-            handler = handlers.get(self.ctx_op)
-            if not handler:
-                sys.exit("Wrong opcode: {}".format(self.ctx_op))
-            try:
-                handler()
-            except Exception as exc:
-                sys.exit("Exception: {}".format(exc))
+            handlers.get(self.ctx_op)()
         return self.outputs[-1] if self.outputs else 0
 
     def get_handlers(self):
@@ -78,48 +77,45 @@ class Intcode(object):
 
     def _check_memory_limits(self, index):
         if index >= len(self._memory):
-            self._extend_memory(index + 1)
-
-    def _extend_memory(self, new_size):
-        if len(self._memory) >= new_size:
-            return
-        self._memory += [0] * (new_size - len(self._memory))
+            new_size = index + 1
+            self._memory += [0] * (new_size - len(self._memory))
 
     def read_code(self):
-        code = self.mem_get(self.ip)
-        self.ctx_op = code % 100
-        code //= 100
+        raw_code = self.mem_get(self.ip)
+        code = raw_code % 100
+        self.ctx_op = Op(code)
+
+        code = raw_code // 100
         self.ctx_modes = []
         for _ in range(0, 3):
             self.ctx_modes.append(PMode(code % 10))
             code //= 10
+        self.log("read_code", raw_code, self.ctx_op, self.ctx_modes)
 
-    def param(self, index):
+    def param(self, index, pointer=False):
         mode = self.ctx_modes[index - 1]
         if mode == PMode.POS:
             address = self.mem_get(self.ip + index)
-            return self.mem_get(address)
+            return address if pointer else self.mem_get(address)
         elif mode == PMode.IMM:
             return self.mem_get(self.ip + index)
         elif mode == PMode.REL:
-            relative_jump = self.mem_get(self.ip + index)
-            address = self.rel_base + relative_jump
-            return self.mem_get(address)
-    
-    def write_pos_ofs(self, pos_offset, value):
-        output_pos = self.mem_get(self.ip + pos_offset)
-        self.mem_set(output_pos, value)
+            address = self.rel_base + self.mem_get(self.ip + index)
+            return address if pointer else self.mem_get(address)
     
+    def write_at_param(self, param_offset, value):
+        self.mem_set(self.param(param_offset, pointer=True), value)
+
     def op_add(self):
-        self.write_pos_ofs(3, self.param(1) + self.param(2))
+        self.write_at_param(3, self.param(1) + self.param(2))
         self.ip += 4
 
     def op_mul(self):
-        self.write_pos_ofs(3, self.param(1) * self.param(2))
+        self.write_at_param(3, self.param(1) * self.param(2))
         self.ip += 4
 
     def op_in(self):
-        self.write_pos_ofs(1, self.inputs.pop(0))
+        self.mem_set(self.param(1, pointer=True), self.inputs.pop(0))
         self.ip += 2
 
     def op_out(self):
@@ -141,11 +137,11 @@ class Intcode(object):
             self.ip += 3
 
     def op_lt(self):
-        self.write_pos_ofs(3, int(self.param(1) < self.param(2)))
+        self.write_at_param(3, int(self.param(1) < self.param(2)))
         self.ip += 4
 
     def op_eq(self):
-        self.write_pos_ofs(3, int(self.param(1) == self.param(2)))
+        self.write_at_param(3, int(self.param(1) == self.param(2)))
         self.ip += 4
 
     def op_srb(self):