#!/usr/bin/env python3

from sys import stdout
from os import unlink
from pycparser import c_ast, parse_file
from re import escape, subn

cross_gcc = "/opt/cross-m68k/bin/m68k-none-elf-gcc"

class Visitor(c_ast.NodeVisitor):
    def reset(self):
        self.path = None
        self.orig = None
        self.subst = None

    def __init__(self):
        self.reset()

    def visit_IdentifierType(self, node):
        if node.coord.file != self.path or self.subst is not None:
            return

        new = None

        if node.names == ["char"]:
            new = "int8_t"

        elif node.names == ["unsigned", "char"]:
            new = "uint8_t"

        elif node.names == ["short"] or \
             node.names == ["int"]:
            new = "int16_t"
        elif node.names == ["unsigned", "short"] or \
             node.names == ["unsigned", "int"] or \
             node.names == ["unsigned"] or \
             node.names == ["uint"] or \
             node.names == ["UWORD16"]:
            new = "uint16_t"

        elif node.names == ["long"]:
            new = "int32_t"

        elif node.names == ["unsigned", "long"]:
            new = "uint32_t"

        elif node.names == ["void"] or \
             node.names == ["int8_t"] or \
             node.names == ["uint8_t"] or \
             node.names == ["int16_t"] or \
             node.names == ["uint16_t"] or \
             node.names == ["int32_t"] or \
             node.names == ["uint32_t"] or \
             node.names == ["va_list"] or \
             node.names == ["jmp_buf"] or \
             node.names == ["BOOL"] or \
             node.names == ["FILE"] or \
             node.names == ["io_arg"] or \
             node.names == ["LPF"]:
            pass

        else:
            raise Exception("unknown type: {}".format(node.names))

        if new is None:
            self.generic_visit(node)
            return

        self.subst = (node.coord.line, node.names, new)

    def get_ast(self):
        with open(self.path, "w") as f:
            f.write(self.orig)

        ast = parse_file(self.path, use_cpp = True, cpp_path = cross_gcc,
                         cpp_args = ["-E", "-I", "include", "-include", "predef.h"])
        # ast.show()

        unlink(self.path)
        return ast

    def fix(self, path, orig):
        self.path = path
        self.orig = orig

        while True:
            self.visit(self.get_ast())

            if self.subst is None:
                break

            lines = self.orig.split("\n")
            (line, old, new) = self.subst

            beg = line - 3 if line > 3 else 0
            end = line + 2 if line < len(lines) - 2 else len(lines)

            focus = "\n".join(lines[beg : end])

            old_re = "[\t ]".join([escape(x) for x in old]) + "([\t \)])"
            (focus, n) = subn(old_re, new + "\g<1>", focus, 1)

            if n != 1:
                print(focus)
                raise Exception("error while replacing {} with {} in {}:{}". \
                                format(old_re, new, self.path, line))

            self.orig = "\n".join(lines[: beg]) + \
                        "\n" + focus + "\n" + \
                        "\n".join(lines[end :])
            self.subst = None

        fixed = self.orig
        self.reset()
        return fixed

vis = Visitor()

with open("misc/c-files.txt", "r") as f:
    for path in f:
        path = path.rstrip()

        if path == "ram/wdfield.c": # breaks pycparser
            continue

        stdout.write("fixing {}                    \r".format(path))
        stdout.flush()

        with open(path, "r") as f:
            orig = f.read()

        segs = path.split("/")
        path_ = "/".join(segs[:-1] + ["_" + segs[-1]])

        fixed = vis.fix(path_, orig)

        with open(path, "w") as f:
            f.write(fixed)

    print("")