#!/usr/bin/env python3
# ##### BEGIN GPL LICENSE BLOCK #####
#
#  This program is free software; you can redistribute it and/or
#  modify it under the terms of the GNU General Public License
#  as published by the Free Software Foundation; either version 2
#  of the License, or (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#  along with this program; if not, write to the Free Software Foundation,
#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#
# ##### END GPL LICENSE BLOCK #####

"""
This tool is for configuring build flags.
"""

WITH_GUI = True

# ----------------------------------------------------------------------------
# Data (flags)
# eg: indervidual flags, compat info.


# ----------------------------------------------------------------------------
# Data (presets)
# eg: profiling, mudflap, debugging.

# setting: ((add, ...), (remove, ...)), ...
PRESETS = {
    "sanitize_address": {
        "CMAKE_CXX_FLAGS": (("-fsanitize=address",), ()),
        "CMAKE_C_FLAGS": (("-fsanitize=address",), ()),
        "CMAKE_EXE_LINKER_FLAGS": (("-lasan",), ()),
    },
    "sanitize_leak": {
        "CMAKE_CXX_FLAGS": (("-fsanitize=leak",), ()),
        "CMAKE_C_FLAGS": (("-fsanitize=leak",), ()),
    },
    "sanitize_undefined": {
        "CMAKE_CXX_FLAGS": (("-fsanitize=undefined",), ()),
        "CMAKE_C_FLAGS": (("-fsanitize=undefined",), ()),
    },
    "sanitize_thread": {
        "CMAKE_CXX_FLAGS": (("-fsanitize=thread",), ()),
        "CMAKE_C_FLAGS": (("-fsanitize=thread",), ()),
    },

    # GCC5
    "sanitize_float_divide_by_zero": {
        "CMAKE_CXX_FLAGS": (("-fsanitize=float-divide-by-zero",), ()),
        "CMAKE_C_FLAGS": (("-fsanitize=float-divide-by-zero",), ()),
    },
    "sanitize_float_cast_overflow": {
        "CMAKE_CXX_FLAGS": (("-fsanitize=float-cast-overflow",), ()),
        "CMAKE_C_FLAGS": (("-fsanitize=float-cast-overflow",), ()),
    },
    "sanitize_int_overflow": {
        "CMAKE_CXX_FLAGS": (("-fsanitize=signed-integer-overflow",), ()),
        "CMAKE_C_FLAGS": (("-fsanitize=signed-integer-overflow",), ()),
    },
    "sanitize_bool": {
        "CMAKE_CXX_FLAGS": (("-fsanitize=bool",), ()),
        "CMAKE_C_FLAGS": (("-fsanitize=bool",), ()),
    },
    "sanitize_enum": {
        "CMAKE_CXX_FLAGS": (("-fsanitize=enum",), ()),
        "CMAKE_C_FLAGS": (("-fsanitize=enum",), ()),
    },
    "sanitize_bounds": {
        "CMAKE_CXX_FLAGS": (("-fsanitize=bounds",), ()),
        "CMAKE_C_FLAGS": (("-fsanitize=bounds",), ()),
    },
    "sanitize_bounds_strict": {
        "CMAKE_CXX_FLAGS": (("-fsanitize=bounds-strict",), ()),
        "CMAKE_C_FLAGS": (("-fsanitize=bounds-strict",), ()),
    },
    "sanitize_vla_bound": {
        "CMAKE_CXX_FLAGS": (("-fsanitize=vla-bound",), ()),
        "CMAKE_C_FLAGS": (("-fsanitize=vla-bound",), ()),
    },
    "sanitize_alignment": {
        "CMAKE_CXX_FLAGS": (("-fsanitize=alignment",), ()),
        "CMAKE_C_FLAGS": (("-fsanitize=alignment",), ()),
    },
    "sanitize_object_size": {
        "CMAKE_CXX_FLAGS": (("-fsanitize=object-size",), ()),
        "CMAKE_C_FLAGS": (("-fsanitize=object-size",), ()),
    },
    "sanitize_nonull_attribute": {
        "CMAKE_CXX_FLAGS": (("-fsanitize=nonnull-attribute",), ()),
        "CMAKE_C_FLAGS": (("-fsanitize=nonnull-attribute",), ()),
    },
    "sanitize_returns_nonull_attribute": {
        "CMAKE_CXX_FLAGS": (("-fsanitize=returns-nonnull-attribute",), ()),
        "CMAKE_C_FLAGS": (("-fsanitize=returns-nonnull-attribute",), ()),
    },

    "warn_all": {
        "CMAKE_CXX_FLAGS": (("-Wall",), ()),
        "CMAKE_C_FLAGS": (("-Wall",), ()),
    },
    "warn_extra": {
        "CMAKE_CXX_FLAGS": (("-Wextra",), ()),
        "CMAKE_C_FLAGS": (("-Wextra",), ()),
    },
    "warn_unused_macros": {
        "CMAKE_CXX_FLAGS": (("-Wunused-macros",), ()),
        "CMAKE_C_FLAGS": (("-Wunused-macros",), ()),
    },
    "warn_undefined_macros": {
        "CMAKE_CXX_FLAGS": (("-Wundef",), ()),
        "CMAKE_C_FLAGS": (("-Wundef",), ()),
    },
    "warn_unused_local_typedefs": {
        "CMAKE_CXX_FLAGS": (("-Wunused-local-typedefs",), ()),
        "CMAKE_C_FLAGS": (("-Wunused-local-typedefs",), ()),
    },
    "warn_pointer_sign": {
        "CMAKE_CXX_FLAGS": (("",), ()),
        "CMAKE_C_FLAGS": (("-Wpointer-sign",), ()),
    },
    "warn_sizeof_pointer_memaccess": {
        "CMAKE_CXX_FLAGS": (("-Wsizeof-pointer-memaccess",), ()),
        "CMAKE_C_FLAGS": (("-Wsizeof-pointer-memaccess",), ()),
    },
    "warn_no_null": {
        "CMAKE_CXX_FLAGS": (("-Wnonnull",), ()),
        "CMAKE_C_FLAGS": (("-Wnonnull",), ()),
    },
    "warn_init_self": {
        "CMAKE_CXX_FLAGS": (("-Winit-self",), ()),
        "CMAKE_C_FLAGS": (("-Winit-self",), ()),
    },
    "warn_format": {
        "CMAKE_CXX_FLAGS": (("-Wformat=2", "-Wno-format-nonliteral", "-Wno-format-y2k"), ()),
        "CMAKE_C_FLAGS": (("-Wformat=2", "-Wno-format-nonliteral", "-Wno-format-y2k"), ()),
    },
    "warn_format": {
        "CMAKE_CXX_FLAGS": (("-Wwrite-strings",), ()),
        "CMAKE_C_FLAGS": (("-Wwrite-strings",), ()),
    },
    "warn_logical_op": {
        "CMAKE_CXX_FLAGS": (("-Wlogical-op",), ()),
        "CMAKE_C_FLAGS": (("-Wlogical-op",), ()),
    },
    "warn_error": {
        "CMAKE_CXX_FLAGS": (("-Werror",), ()),
        "CMAKE_C_FLAGS": (("-Werror",), ()),
    },
    "warn_shadow": {
        "CMAKE_CXX_FLAGS": (("-Wshadow", "-Wno-error=shadow"), ()),
        "CMAKE_C_FLAGS": (("-Wshadow", "-Wno-error=shadow"), ()),
    },
    "warn_missing_include_dirs": {
        "CMAKE_CXX_FLAGS": (("-Wmissing-include-dirs",), ()),
        "CMAKE_C_FLAGS": (("-Wmissing-include-dirs",), ()),
    },
    "warn_double_promotion": {
        "CMAKE_CXX_FLAGS": (("-Wdouble-promotion",), ()),
        "CMAKE_C_FLAGS": (("-Wdouble-promotion",), ()),
    },
    "warn_declaration_after_statement": {
        "CMAKE_C_FLAGS": (("-Wdeclaration-after-statement",), ()),
    },
    "warn_zero_as_null_pointer_constant": {
        "CMAKE_CXX_FLAGS": (("-Wzero-as-null-pointer-constant",), ()),
    },
    "show_color": {
        "CMAKE_C_FLAGS": (("-fdiagnostics-color=always",), ()),
        "CMAKE_CXX_FLAGS": (("-fdiagnostics-color=always",), ()),
    },

    # Optimize
    "optimize_whole_program": {
        "CMAKE_CXX_FLAGS": (("-flto",), ()),
        "CMAKE_C_FLAGS": (("-flto",), ()),
        "CMAKE_EXE_LINKER_FLAGS": (("-flto", "-fwhole-program",), ()),
    },

    # Profile
    "profile_gprof": {
        "CMAKE_CXX_FLAGS": (("-pg",), ()),
        "CMAKE_C_FLAGS": (("-pg",), ()),
        "CMAKE_EXE_LINKER_FLAGS": (("-pg",), ()),
    },
}

# ----------------------------------------------------------------------------
# Utility Functions
# eg: check buildsystem (make or ninja?)


def cmake_flag_buildtype_suffix(flag, build_type):
    """
    Add the build type as a suffix for options that support it.
    this way for Debug builds we edit debug flags.
    eg:
      CMAKE_CXX_FLAGS -> CMAKE_CXX_FLAGS_DEBUG
    """
    if build_type == "":
        return flag

    # perhaps there are more,
    # but these are default that can have _DEBUG... etc added.
    if flag in {'CMAKE_CXX_FLAGS',
                'CMAKE_C_FLAGS',
                'CMAKE_EXE_LINKER_FLAGS',
                'CMAKE_MODULE_LINKER_FLAGS',
                'CMAKE_SHARED_LINKER_FLAGS'}:

        return "%s_%s" % (flag, build_type.upper())
    else:
        return flag


# ----------------------------------------------------------------------------
# CMakeCache.txt Parser (simple)
#
# These functions should run standalone
# format in python is as follows...
#
# CMakeCache.txt is converted into a dict
# the key is the cache ID
# the value is a triple (type, value, description, internal)
# where the description is the comment above conforming to the CMake convention.
#
#
def cmakecache_to_py(filepath, native=True):
    """
    header, cache
    """

    cmake_header = ""
    cmake_cache = {}

    with open(filepath, 'r', encoding='utf-8') as f:
        lines = f.readlines()
        for i in range(len(lines)):
            if lines[i].startswith("#"):
                cmake_header += lines[i]
            else:
                break

        # in case it's not set
        cmake_descr = ""
        cmake_internal = False

        for i in range(len(lines)):
            if lines[i].startswith("//"):
                cmake_descr += lines[i][2:].rstrip() + "\n"
            elif lines[i].startswith("#"):
                if "INTERNAL cache entries" in lines[i]:
                    cmake_internal = True
            elif lines[i][0].isalpha() or lines[i][0] in {"_", "-"}:
                cmake_name, cmake_value = lines[i].split("=", 1)
                if ":" in cmake_name:
                    cmake_name, cmake_type = cmake_name.split(":", 1)
                else:
                    cmake_type = "STRING"
                cmake_value = cmake_value.rstrip()  # remove trailing '\n'
                cmake_descr = cmake_descr.rstrip()

                if native:
                    if cmake_type in {"STRING", "PATH", "FILEPATH", "STATIC", "INTERNAL", "UNINITIALIZED"}:
                        pass
                    elif cmake_type == "BOOL":
                        cmake_value = cmake_value.upper() not in {"NO", "N", "", "OFF", "0", "FALSE"}

                cmake_cache[cmake_name] = (cmake_type, cmake_value, cmake_descr, cmake_internal)

                # in case it's not set
                cmake_descr = ""

    return cmake_header, cmake_cache


def cmakecache_from_py(filepath, cmake_header, cmake_cache):

    with open(filepath, 'w', encoding='utf-8') as f:
        f.write(cmake_header)
        f.write("\n")

        cmake_cache_list = ([], [])

        # sort into external/internal
        for cmake_name, (cmake_type, cmake_value, cmake_descr, cmake_internal) in cmake_cache.items():
            cmake_cache_list[cmake_internal].append((cmake_name, cmake_type, cmake_value, cmake_descr))

        for is_internal, ls in enumerate(cmake_cache_list):
            ls.sort()
            if is_internal:
                f.write("########################\n"
                        "# INTERNAL cache entries\n"
                        "########################\n\n")
            else:
                f.write("########################\n"
                        "# EXTERNAL cache entries\n"
                        "########################\n\n")

            for cmake_name, cmake_type, cmake_value, cmake_descr in ls:
                if cmake_descr:
                    l = None
                    for l in cmake_descr.split("\n"):
                        f.write("//%s\n" % l)
                    del l

                # convert the value
                if cmake_value is True:
                    cmake_value = "TRUE"
                elif cmake_value is False:
                    cmake_value = "FALSE"

                f.write("%s:%s=%s\n" % (cmake_name, cmake_type, cmake_value))
                if not is_internal:
                    f.write("\n")

# cmake_header, cmake_cache = cmakecache_to_py("/src/cmake_debug/CMakeCache.txt~")
# cmakecache_from_py("/src/cmake_debug/CMakeCache.txt", cmake_header, cmake_cache)
# print(cmake_cache)


# ----------------------------------------------------------------------------
# Main Functions (can be run from command line)

def config_set(config_id, state):
    print(config_id, state.get(), dir(state))
    cache = CMAKE_DATA["cmake_cache"]
    build_type = cache["CMAKE_BUILD_TYPE"][1]  # value

    cfg = PRESETS[config_id]
    for key, (add, rem) in cfg.items():
        key = cmake_flag_buildtype_suffix(key, build_type)
        (cmake_type, cmake_value, cmake_descr, cmake_internal) = cache[key]
        data = cmake_value.split()
        if not state.get():
            add, rem = rem, add

        for arg in rem:
            data[:] = [i for i in data if i != arg]
        data.extend(add)

        # print("A", data)
        cmake_value = " ".join(data)
        # print("B", cmake_value)
        cache[key] = (cmake_type, cmake_value, cmake_descr, cmake_internal)
        print("AFTER", cache[key])


def config_check(config_id):
    cache = CMAKE_DATA["cmake_cache"]
    build_type = cache["CMAKE_BUILD_TYPE"][1]  # value

    cfg = PRESETS[config_id]
    for key, (add, rem) in cfg.items():
        key = cmake_flag_buildtype_suffix(key, build_type)
        (cmake_type, cmake_value, cmake_descr, cmake_internal) = cache[key]
        data = cmake_value.split()
        for arg in add:
            if arg not in data:
                return False
    return True


# ----------------------------------------------------------------------------
# Command Line Interface

# ----------------------------------------------------------------------------
# User Interface
if WITH_GUI:
    CMAKE_DATA = {}
    # CMAKE_CACHE = "/src/cmake_debugCMakeCache.txt"
    CMAKE_CACHE = "CMakeCache.txt"

    def cmake_read():
        print("%s: reading..." % CMAKE_CACHE)
        (CMAKE_DATA["cmake_header"],
         CMAKE_DATA["cmake_cache"],
         ) = cmakecache_to_py(CMAKE_CACHE)

    def cmake_write():
        print("%s: writing..." % CMAKE_CACHE)
        CMAKE_CACHE_TMP = CMAKE_CACHE + "~"
        cmakecache_from_py(CMAKE_CACHE_TMP,
                           CMAKE_DATA["cmake_header"],
                           CMAKE_DATA["cmake_cache"])

        import shutil
        shutil.move(CMAKE_CACHE_TMP, CMAKE_CACHE)

    # read before load.
    cmake_read()

    import tkinter
    master = tkinter.Tk()

    row = 0
    tkinter.Label(master, text="Flags:").grid(row=row, sticky=tkinter.W)
    row += 1

    def config_but(my_id):
        global row
        var = tkinter.IntVar()
        var.set(config_check(my_id))
        tkinter.Checkbutton(master,
                            text=my_id.replace("_", " ").capitalize(),
                            variable=var,
                            command=lambda: config_set(my_id, var)).grid(row=row, sticky=tkinter.W)
        row += 1

    for my_id in sorted(PRESETS.keys()):
        config_but(my_id)

    tkinter.Button(master, text='Write', command=cmake_write).grid(row=row, sticky=tkinter.W, pady=4)
    row += 1
    tkinter.Button(master, text='Quit', command=master.quit).grid(row=row, sticky=tkinter.W, pady=4)
    row += 1
    # tkinter.Button(master, text='Show', command=var_states).grid(row=4, sticky=tkinter.W, pady=4)

    tkinter.mainloop()

# EOF