#!/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/'])

SConscript("arvr/SCsub")
SConscript("pluginscript/SCsub")

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

def _build_gdnative_api_struct_header(api):
    ext_wrappers = ''

    for name in api['extensions']:
        ext_wrappers += ' extern const godot_gdnative_ext_' + name + '_api_struct *_gdnative_wrapper_' + name + '_api_struct;'

    ext_init = 'for (int i = 0; i < _gdnative_wrapper_api_struct->num_extensions; i++) { '
    ext_init += 'switch (_gdnative_wrapper_api_struct->extensions[i]->type) {'

    for name in api['extensions']:
        ext_init += 'case GDNATIVE_EXT_' + api['extensions'][name]['type'] + ': '
        ext_init += '_gdnative_wrapper_' + name + '_api_struct = (' + 'godot_gdnative_ext_' + name + '_api_struct *) _gdnative_wrapper_api_struct->extensions[i]; break;'

    ext_init += '}'

    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 <arvr/godot_arvr.h>',
        '#include <nativescript/godot_nativescript.h>',
        '#include <pluginscript/godot_pluginscript.h>',
        '',
        '#define GDNATIVE_API_INIT(options) do { extern const godot_gdnative_api_struct *_gdnative_wrapper_api_struct;' + ext_wrappers + ' _gdnative_wrapper_api_struct = options->api_struct; ' + ext_init + ' } while (0)',
        '',
        '#ifdef __cplusplus',
        'extern "C" {',
        '#endif',
        '',
        'enum GDNATIVE_API_TYPES {',
        '\tGDNATIVE_' + api['core']['type'] + ','
    ]

    for name in api['extensions']:
        out += ['\tGDNATIVE_EXT_' + api['extensions'][name]['type'] + ',']

    out += ['};', '']

    for name in api['extensions']:
        out += [
            'typedef struct godot_gdnative_ext_' + name + '_api_struct {',
            '\tunsigned int type;',
            '\tgodot_gdnative_api_version version;',
            '\tconst godot_gdnative_api_struct *next;'
        ]

        for funcdef in api['extensions'][name]['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_ext_' + name + '_api_struct;', '']

    out += [
        'typedef struct godot_gdnative_core_api_struct {',
        '\tunsigned int type;',
        '\tgodot_gdnative_api_version version;',
        '\tconst godot_gdnative_api_struct *next;',
        '\tunsigned int num_extensions;',
        '\tconst godot_gdnative_api_struct **extensions;',
    ]

    for funcdef in api['core']['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_core_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>',
        ''
    ]

    for name in api['extensions']:
        out += [
            'extern const godot_gdnative_ext_' + name + '_api_struct api_extension_' + name + '_struct = {',
            '\tGDNATIVE_EXT_' + api['extensions'][name]['type'] + ',',
            '\t{' + str(api['extensions'][name]['version']['major']) + ', ' + str(api['extensions'][name]['version']['minor']) + '},',
            '\tNULL,'
        ]

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

        out += ['};\n']

    out += ['', 'const godot_gdnative_api_struct *gdnative_extensions_pointers[] = {']

    for name in api['extensions']:
        out += ['\t(godot_gdnative_api_struct *)&api_extension_' + name + '_struct,']

    out += ['};\n']

    out += [
        'extern const godot_gdnative_core_api_struct api_struct = {',
        '\tGDNATIVE_' + api['core']['type'] + ',',
        '\t{' + str(api['core']['version']['major']) + ', ' + str(api['core']['version']['minor']) + '},',
        '\tNULL,',
        '\t' + str(len(api['extensions'])) + ',',
        '\tgdnative_extensions_pointers,',
    ]

    for funcdef in api['core']['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 <pluginscript/godot_pluginscript.h>',
        '#include <arvr/godot_arvr.h>',
        '',
        '#include <gdnative_api_struct.gen.h>',
        '',
        '#ifdef __cplusplus',
        'extern "C" {',
        '#endif',
        '',
        'godot_gdnative_core_api_struct *_gdnative_wrapper_api_struct = 0;',
    ]

    for name in api['extensions']:
        out.append('godot_gdnative_ext_' + name + '_api_struct *_gdnative_wrapper_' + name + '_api_struct;')

    out += ['']

    for funcdef in api['core']['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('')

    for name in api['extensions']:
        for funcdef in api['extensions'][name]['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_' + name + '_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])