#!/usr/bin/env python

Import('env')

gdn_env = env.Clone()

gdn_env.add_source_files(env.modules_sources, "gd_native_library_editor.cpp")
gdn_env.add_source_files(env.modules_sources, "gdnative.cpp")
gdn_env.add_source_files(env.modules_sources, "register_types.cpp")
gdn_env.add_source_files(env.modules_sources, "gdnative/*.cpp")
gdn_env.add_source_files(env.modules_sources, "nativescript/*.cpp")

gdn_env.Append(CPPPATH=['#modules/gdnative/include/'])

def _spaced(e):
    return e if e[-1] == '*' else e + ' '

def _build_gdnative_api_struct_header(api):
    out = [
        '/* THIS FILE IS GENERATED DO NOT EDIT */',
        '#ifndef GODOT_GDNATIVE_API_STRUCT_H',
        '#define GODOT_GDNATIVE_API_STRUCT_H',
        '',
        '#include <gdnative/gdnative.h>',
        '#include <nativescript/godot_nativescript.h>',
        '',
        '#define GDNATIVE_API_INIT(options) do { extern const godot_gdnative_api_struct *_gdnative_wrapper_api_struct; _gdnative_wrapper_api_struct = options->api_struct; } while (0)',
        '',
        '#ifdef __cplusplus',
        'extern "C" {',
        '#endif',
        '',
        'typedef struct godot_gdnative_api_struct {',
        '\tvoid *next;',
        '\tconst char *version;',
    ]

    for funcdef in api['api']:
        args = ', '.join(['%s%s' % (_spaced(t), n) for t, n in funcdef['arguments']])
        out.append('\t%s(*%s)(%s);' % (_spaced(funcdef['return_type']), funcdef['name'], args))

    out += [
        '} godot_gdnative_api_struct;',
        '',
        '#ifdef __cplusplus',
        '}',
        '#endif',
        '',
        '#endif // GODOT_GDNATIVE_API_STRUCT_H',
        ''
    ]
    return '\n'.join(out)

def _build_gdnative_api_struct_source(api):
    out = [
        '/* THIS FILE IS GENERATED DO NOT EDIT */',
        '',
        '#include <gdnative_api_struct.gen.h>',
        '',
        'const char *_gdnative_api_version = "%s";' % api['version'],
        'extern const godot_gdnative_api_struct api_struct = {',
        '\tNULL,',
        '\t_gdnative_api_version,',
    ]

    for funcdef in api['api']:
        out.append('\t%s,' % funcdef['name'])
    out.append('};\n')

    return '\n'.join(out)

def build_gdnative_api_struct(target, source, env):
    import json
    from collections import OrderedDict

    with open(source[0].path, 'r') as fd:
        api = json.load(fd)

    header, source = target
    with open(header.path, 'w') as fd:
        fd.write(_build_gdnative_api_struct_header(api))
    with open(source.path, 'w') as fd:
        fd.write(_build_gdnative_api_struct_source(api))

_, gensource = gdn_env.Command(['include/gdnative_api_struct.gen.h', 'gdnative_api_struct.gen.cpp'],
                               'gdnative_api.json', build_gdnative_api_struct)
gdn_env.add_source_files(env.modules_sources, [gensource])

env.use_ptrcall = True


def _build_gdnative_wrapper_code(api):
    out = [
        '/* THIS FILE IS GENERATED DO NOT EDIT */',
        '',
        '#include <gdnative/gdnative.h>',
        '#include <nativescript/godot_nativescript.h>',
        '',
        '#include <gdnative_api_struct.gen.h>',
        '',
        'godot_gdnative_api_struct *_gdnative_wrapper_api_struct = 0;',
        '',
        '#ifdef __cplusplus',
        'extern "C" {',
        '#endif',
        ''
    ]

    for funcdef in api['api']:
        args = ', '.join(['%s%s' % (_spaced(t), n) for t, n in funcdef['arguments']])
        out.append('%s%s(%s) {' % (_spaced(funcdef['return_type']), funcdef['name'], args))

        args = ', '.join(['%s' % n for t, n in funcdef['arguments']])

        return_line = '\treturn ' if funcdef['return_type'] != 'void' else '\t'
        return_line += '_gdnative_wrapper_api_struct->' + funcdef['name'] + '(' + args + ');'

        out.append(return_line)
        out.append('}')
        out.append('')

    out += [
        '#ifdef __cplusplus',
        '}',
        '#endif'
    ]

    return '\n'.join(out)


def build_gdnative_wrapper_code(target, source, env):
    import json
    with open(source[0].path, 'r') as fd:
        api = json.load(fd)

    wrapper_file = target[0]
    with open(wrapper_file.path, 'w') as fd:
        fd.write(_build_gdnative_wrapper_code(api))



if ARGUMENTS.get('gdnative_wrapper', False):
    #build wrapper code
    gensource, = gdn_env.Command('gdnative_wrapper_code.gen.cpp', 'gdnative_api.json', build_gdnative_wrapper_code)

    gd_wrapper_env = env.Clone()
    gd_wrapper_env.Append(CPPPATH=['#modules/gdnative/include/'])

    # I think this doesn't work on MSVC yet...
    gd_wrapper_env.Append(CCFLAGS=['-fPIC'])

    gd_wrapper_env.Library("#bin/gdnative_wrapper_code", [gensource])