#!/usr/bin/python3

import os
import re
import subprocess
import sys

script_dir = os.path.dirname(os.path.realpath(__file__))
root_dir = script_dir + "/../"

current_ver_dir = script_dir + "/../ver/current/"
asm_dir = root_dir + "asm/nonmatchings/"

symbol_addrs_path = os.path.join(current_ver_dir, "symbol_addrs.txt")
elf_path = os.path.join(current_ver_dir, "build", "papermario.elf")
map_path = os.path.join(current_ver_dir, "build", "papermario.map")
ignores_path = os.path.join(root_dir, "tools", "ignored_funcs.txt")

map_symbols = {}
symbol_addrs = []
elf_symbols = []

ignores = set()

verbose = False

def read_ignores():
    with open(ignores_path) as f:
        lines = f.readlines()

    for line in lines:
        name = line.split(" = ")[0].strip()
        if name != "":
            ignores.add(name)

def scan_map():
    ram_offset = None
    cur_file = "<no file>"
    prev_line = ""
    with open(map_path) as f:
        for line in f:
            if "load address" in line:
                ram = int(line[16 : 16 + 18], 0)
                rom = int(line[59 : 59 + 18], 0)
                ram_offset = ram - rom
                continue

            prev_line = line

            if (
                ram_offset is None
                or "=" in line
                or "*fill*" in line
                or " 0x" not in line
            ):
                continue

            ram = int(line[16 : 16 + 18], 0)
            rom = ram - ram_offset
            sym = line.split()[-1]

            if "0x" in sym:
                ram_offset = None
                continue
            elif "/" in sym:
                cur_file = sym
                continue

            map_symbols[sym] = (rom, cur_file, ram)

def read_symbol_addrs():
    unique_lines = set()

    with open(symbol_addrs_path, "r") as f:
        for line in f.readlines():
                unique_lines.add(line)

        for line in unique_lines:
            main, ext = line.rstrip().split(";")
            opt = ext.split("//")[-1].strip().split(" ")

            type = None
            rom = -1

            args = []
            for thing in list(opt):
                if thing.strip() == "":
                    opt.remove(thing)
                if "type:" in thing:
                    type = thing.split(":")[1]
                    opt.remove(thing)
                elif "rom:" in thing:
                    rom = int(thing.split(":")[1], 16)
                    opt.remove(thing)

            name, addr = main.split(" = ")

            symbol_addrs.append([name, int(addr, 0), type, rom, opt])

def read_elf():
    try:
        result = subprocess.run(['objdump', '-x', elf_path], stdout=subprocess.PIPE)
        objdump_lines = result.stdout.decode().split("\n")
    except:
        print(f"Error: Could not run objdump on {elf_path} - make sure that the project is built")
        sys.exit(1)

    for line in objdump_lines:
        if " F " in line or " O " in line or " *ABS*" in line:
            components = line.split()
            name = components[-1]

            if "/" in name or \
               name in ignores or \
               name.startswith("_") or \
               name.startswith("jtbl_") or \
               re.match(r"L[0-9A-F]{8}", name):
                continue

            addr = int(components[0], 16)
            if " F " in line or name.startswith("func_"):
                type = "func"
            else:
                type = "data"

            rom = None

            if name in map_symbols:
                rom = map_symbols[name][0]
            elif re.match(".*_[0-9A-F]{8}_[0-9A-F]{6}", name):
                rom = int(name.split('_')[-1], 16)

            elf_symbols.append((name, addr, type, rom))

def log(s):
    if verbose:
        print(s)

def reconcile_symbols():
    print(f"Processing {str(len(elf_symbols))} elf symbols...")

    for i, elf_sym in enumerate(elf_symbols):
        if i % 1000 == 0:
            print(i)
        name_match = None
        rom_match = None

        for known_sym in symbol_addrs:
            # Name
            if not name_match:
                if elf_sym[0] == known_sym[0]:
                    name_match = known_sym

                    if elf_sym[1] != known_sym[1]:
                        log(f"Ram mismatch! {elf_sym[0]} is 0x{elf_sym[1]:X} in the elf and 0x{known_sym[1]} in symbol_addrs")

            # Rom
            if not rom_match:
                # Todo account for either or both syms not containing a rom addr
                if elf_sym[3]:
                    if elf_sym[3] == known_sym[3]:
                        rom_match = known_sym

        if not name_match and not rom_match:
            log(f"Creating new symbol {elf_sym[0]}")
            symbol_addrs.append([elf_sym[0], elf_sym[1], elf_sym[2], elf_sym[3] if elf_sym[3] else -1, []])
        elif not name_match:
            log(f"Renaming identical rom address symbol {rom_match[0]} to {elf_sym[0]}")
            rom_match[0] = elf_sym[0]
        elif not rom_match and elf_sym[3]:
            if name_match[3] >= 0:
                log(f"Correcting rom address {name_match[3]} to {elf_sym[3]} for symbol {name_match[0]}")
            else:
                log(f"Adding rom address {elf_sym[3]} to symbol {name_match[0]}")
            name_match[3] = elf_sym[3]

def write_new_symbol_addrs():
    with open(symbol_addrs_path, "w", newline="\n") as f:
        for symbol in sorted(symbol_addrs, key=lambda x: (x[3] == -1, x[3], x[1], x[0])):
            line = f"{symbol[0]} = 0x{symbol[1]:X}; //"
            if symbol[2]:
                line += f" type:{symbol[2]}"
            if symbol[3] >= 0:
                line += f" rom:0x{symbol[3]:X}"
            if len(symbol[4]) > 0:
                for thing in symbol[4]:
                    line += f" {thing}"
            f.write(line + "\n")

read_ignores()
scan_map()
read_symbol_addrs()

# chicken scratch cod to print out new / renamed symbols
# with open("tools/new_syms.txt") as f:
#     new_syms = f.readlines()

# new_sym_dict = {}
# for sym_line in new_syms:
#     sym_line = sym_line.strip()
#     if sym_line:
#         name, rest = sym_line.split(" = ")
#         vram = int(rest.split(";")[0], 0)
#         new_sym_dict[vram] = name

# renames = []
# adds = []
# for addr in new_sym_dict:
#     found = False
#     for thing in symbol_addrs:
#         if thing[1] == addr and not thing[0].startswith("func_") and not thing[0].startswith("D_"):
#             if new_sym_dict[addr] != thing[0]:
#                 renames.append(f"{thing[0]} -> {new_sym_dict[addr]}")
#             found = True
#             break
#     if not found:
#         adds.append(f"{new_sym_dict[addr]} = {addr:X}")

# for r in renames:
#     print(r)
# for a in adds:
#     print(a)

read_elf()
reconcile_symbols()
write_new_symbol_addrs()