"""Functions used to generate source files during build time"""

from collections import OrderedDict


def make_default_controller_mappings(target, source, env):
    dst = str(target[0])
    with open(dst, "w", encoding="utf-8", newline="\n") as g:
        g.write("/* THIS FILE IS GENERATED DO NOT EDIT */\n")
        g.write('#include "core/typedefs.h"\n')
        g.write('#include "core/input/default_controller_mappings.h"\n')

        # ensure mappings have a consistent order
        platform_mappings: dict = OrderedDict()
        for src_path in source:
            with open(str(src_path), "r") as f:
                # read mapping file and skip header
                mapping_file_lines = f.readlines()[2:]

            current_platform = None
            for line in mapping_file_lines:
                if not line:
                    continue
                line = line.strip()
                if len(line) == 0:
                    continue
                if line[0] == "#":
                    current_platform = line[1:].strip()
                    if current_platform not in platform_mappings:
                        platform_mappings[current_platform] = {}
                elif current_platform:
                    line_parts = line.split(",")
                    guid = line_parts[0]
                    if guid in platform_mappings[current_platform]:
                        g.write(
                            "// WARNING - DATABASE {} OVERWROTE PRIOR MAPPING: {} {}\n".format(
                                src_path, current_platform, platform_mappings[current_platform][guid]
                            )
                        )
                    platform_mappings[current_platform][guid] = line

        platform_variables = {
            "Linux": "#ifdef LINUXBSD_ENABLED",
            "Windows": "#ifdef WINDOWS_ENABLED",
            "Mac OS X": "#ifdef MACOS_ENABLED",
            "Android": "#ifdef ANDROID_ENABLED",
            "iOS": "#ifdef IOS_ENABLED",
            "Web": "#ifdef WEB_ENABLED",
        }

        g.write("const char* DefaultControllerMappings::mappings[] = {\n")
        for platform, mappings in platform_mappings.items():
            variable = platform_variables[platform]
            g.write("{}\n".format(variable))
            for mapping in mappings.values():
                g.write('\t"{}",\n'.format(mapping))
            g.write("#endif\n")

        g.write("\tnullptr\n};\n")