project('Aegisub', ['c', 'cpp'],
        license: 'BSD-3-Clause',
        meson_version: '>=0.56.1',
        default_options: ['cpp_std=c++11', 'b_lto=true', 'buildtype=debugoptimized'],
        version: '3.2.2')

cmake = import('cmake')

if host_machine.system() == 'windows'
    sys_nasm = find_program('nasm', required: false)
    if not sys_nasm.found()
        nasm = subproject('nasm').get_variable('nasm')
        meson.override_find_program('nasm', nasm)
    endif
endif

if host_machine.system() == 'windows'
    version_sh = find_program('tools/version.ps1')
else
    version_sh = find_program('tools/version.sh')
endif
version_inc = include_directories('.')
version_h = custom_target('git_version.h',
                          command: [version_sh, meson.current_build_dir(), meson.current_source_dir()],
                          build_by_default: true,
                          build_always_stale: true, # has internal check whether target file will be refreshed
                          output: ['git_version.h'])

if host_machine.system() == 'darwin' and get_option('build_osx_bundle')
    prefix = meson.current_build_dir() / 'Aegisub.app' / 'Contents'
    bindir = prefix / 'MacOS'
    datadir = prefix / 'SharedSupport'
    localedir = prefix / 'Resources'
else
    prefix = get_option('prefix')
    bindir = prefix / get_option('bindir')
    datadir = prefix / get_option('datadir')
    localedir = prefix / get_option('localedir')
endif
docdir = prefix / 'doc'
dataroot = datadir / 'aegisub'
add_project_arguments('-DP_DATA="@0@"'.format(dataroot), language: 'cpp')

if host_machine.system() == 'windows'
    add_project_arguments('-DNOMINMAX', '-D_WIN32_WINNT=0x0601', language: 'cpp')
endif

# MSVC sets this automatically with -MDd, but it has a different meaning on other platforms
if get_option('debug') and host_machine.system() != 'windows'
    add_project_arguments('-D_DEBUG', language: 'cpp')
endif

conf = configuration_data()
conf.set_quoted('P_DATA', dataroot)
if get_option('credit') != ''
    conf.set_quoted('BUILD_CREDIT', get_option('credit'))
endif
conf.set('WITH_UPDATE_CHECKER', get_option('enable_update_checker'))

deps = []
deps_inc = []

conf.set('WITH_FONTCONFIG', '0')
if host_machine.system() == 'darwin'
    add_languages('objc', 'objcpp')
    add_project_arguments('-DGL_SILENCE_DEPRECATION', language: 'cpp')
    # meson neither supports objcpp_std nor inherits cpp_std https://github.com/mesonbuild/meson/issues/5495
    add_project_arguments('-std=c++11', language: 'objcpp')
elif host_machine.system() != 'windows'
    conf.set('WITH_FONTCONFIG', '1')
    deps += dependency('fontconfig')
endif

cxx = meson.get_compiler('cpp')
cc = meson.get_compiler('c')
deps += cc.find_library('m', required: false)
deps += cc.find_library('dl', required: false)
if not cxx.check_header('iconv.h')
    iconv_sp = subproject('iconv') # this really needs to be replaced with a proper port
    deps += iconv_sp.get_variable('libiconv_dep')
endif

deps += dependency('libass', version: '>=0.9.7',
                   fallback: ['libass', 'libass_dep'])

boost_modules = ['chrono', 'filesystem', 'thread', 'locale', 'regex']
if not get_option('local_boost')
    boost_dep = dependency('boost', version: '>=1.50.0',
                            modules: boost_modules + ['system'],
                            required: false,
                            static: get_option('default_library') == 'static')
endif

if get_option('local_boost') or not boost_dep.found()
    boost_dep = []
    boost = subproject('boost')
    foreach module: boost_modules
        boost_dep += boost.get_variable('boost_' + module + '_dep')
    endforeach
endif

deps += boost_dep
if host_machine.system() == 'windows'
    conf.set('BOOST_USE_WINDOWS_H', '1')
endif

deps += dependency('zlib')

wx_minver = '>=3.0.0'
if host_machine.system() == 'darwin'
    wx_minver = '>=3.1.0'
endif
wx_dep = dependency('wxWidgets', version: wx_minver,
                    required: false,
                    modules: ['std', 'stc', 'gl'])

if wx_dep.found()
    deps += wx_dep
else
    build_shared = 'ON'
    if get_option('default_library') == 'static'
        build_shared = 'OFF'
    endif
    build_type = 'Release'
    if get_option('buildtype') == 'debug'
        build_type = 'Debug'
    endif

    wx = cmake.subproject('wxWidgets', cmake_options: ['-DwxBUILD_INSTALL=OFF',
                                                       '-DwxBUILD_PRECOMP=OFF', # otherwise breaks project generation w/ meson
                                                       '-DwxBUILD_SHARED=@0@'.format(build_shared),
                                                       '-DwxUSE_WEBVIEW=OFF', # breaks build on linux
                                                       '-DCMAKE_BUILD_TYPE=@0@'.format(build_type),
                                                       '-DwxUSE_IMAGE=ON',
                                                       '-DwxBUILD_MONOLITHIC=ON']) # otherwise breaks project generation w/ meson
    deps += [
        wx.dependency('wxmono'),
        wx.dependency('wxregex'),
        wx.dependency('wxscintilla')
    ]

    if host_machine.system() == 'windows' or host_machine.system() == 'darwin'
        deps += [
            wx.dependency('wxpng'),
        ]
    endif

    if host_machine.system() == 'windows'
        deps += [
            wx.dependency('wxzlib'),
            wx.dependency('wxexpat'),
        ]

        if cc.has_header('rpc.h')
            deps += cc.find_library('rpcrt4', required: true)
        else
            error('Missing Windows SDK RPC Library (rpc.h / rpcrt4.lib)')
        endif
        if cc.has_header('commctrl.h')
            deps += cc.find_library('comctl32', required: true)
        else
            error('Missing Windows SDK Common Controls Library (commctrl.h / comctl32.lib)')
        endif
    endif
endif

deps += dependency('icu-uc', version: '>=4.8.1.1')
deps += dependency('icu-i18n', version: '>=4.8.1.1')

dep_avail = []
foreach dep: [
    # audio, in order of precedence
    ['libpulse', '', 'PulseAudio', []],
    ['alsa', '', 'ALSA', []],
    ['portaudio-2.0', '', 'PortAudio', []],
    ['openal', '>=0.0.8', 'OpenAL', []],
    # video
    ['ffms2', '>=2.22', 'FFMS2', ['ffms2', 'ffms2_dep']],
    # other
    ['fftw3', '', 'FFTW3', []],
    ['hunspell', '', 'Hunspell', []], # needs a proper port
    ['uchardet', '', 'uchardet', []], # needs a proper port
]
    dep_version = dep[1] != '' ? dep[1] : '>=0'
    # [provide] section is ignored if required is false;
    # must provided define fallback explicitly
    # (with meson 0.56 you can do allow_fallback: true):
    #d = dependency(dep[0], version: dep_version,
    #               required: false, allow_fallback: true)
    if dep[3].length() > 0
        d = dependency(dep[0], version: dep_version, fallback: dep[3])
    else
        d = dependency(dep[0], version: dep_version, required: false)
    endif

    optname = dep[0].split('-')[0]
    if d.found() and not get_option(optname).disabled()
        deps += d
        conf.set('WITH_@0@'.format(dep[0].split('-')[0].to_upper()), '1')
        dep_avail += dep[2]
    elif get_option(optname).enabled()
        error('@0@ enabled but not found'.format(dep[2]))
    endif
endforeach

if host_machine.system() == 'windows' and get_option('avisynth').enabled()
    conf.set('WITH_AVISYNTH', 1) # bundled separately with installer
endif

if host_machine.system() == 'windows' and not get_option('directsound').disabled()
    dsound_dep = cc.find_library('dsound', required: get_option('directsound'))
    winmm_dep = cc.find_library('winmm', required: get_option('directsound'))
    ole32_dep = cc.find_library('ole32', required: get_option('directsound'))
    have_dsound_h = cc.has_header('dsound.h')
    if not have_dsound_h and get_option('directsound').enabled()
        error('DirectSound enabled but dsound.h not found')
    endif

    dxguid_dep = cc.find_library('dxguid', required: true)
    if dsound_dep.found() and winmm_dep.found() and ole32_dep.found() and dxguid_dep.found() and have_dsound_h
        deps += [dsound_dep, winmm_dep, ole32_dep, dxguid_dep]
        conf.set('WITH_DIRECTSOUND', '1')
        dep_avail += 'DirectSound'
    endif
endif

if host_machine.system() == 'darwin'
    frameworks_dep = dependency('appleframeworks', modules : ['CoreText', 'CoreFoundation', 'AppKit', 'Carbon'])
    deps += frameworks_dep
endif

# TODO: OSS

def_audio = get_option('default_audio_output')
if def_audio != 'auto'
    if not dep_avail.contains(def_audio)
        error('Default audio output "@0@" selected but not available'.format(def_audio))
    endif
elif dep_avail.length() != 0
    def_audio = dep_avail[0]
else
    def_audio = ''
endif

conf_platform = configuration_data()
conf_platform.set('DEFAULT_PLAYER_AUDIO', def_audio)

luajit = dependency('luajit', version: '>=2.0.0', required: get_option('system_luajit'))
if luajit.found()
    luajit_test = cc.run('''#include <lauxlib.h>
int main(void)
{
    lua_State *L = luaL_newstate();
    if (!L) return 1;
    // This is valid in lua 5.2, but a syntax error in 5.1
    const char testprogram[] = "function foo() while true do break return end end";
    return luaL_loadstring(L, testprogram) == LUA_ERRSYNTAX;
}''', dependencies: luajit)

    if luajit_test.returncode() == 1
        if get_option('system_luajit')
            error('System luajit found but not compiled in 5.2 mode')
        else
            message('System luajit found but not compiled in 5.2 mode; using built-in luajit')
        endif
    else
        deps += luajit
    endif
else
    message('System luajit not found; using built-in luajit')
endif

if not deps.contains(luajit)
    luajit_sp = subproject('luajit')
    luajit_inc = luajit_sp.get_variable('incdir')
    deps += luajit_sp.get_variable('luajit_dep')
else
    luajit_inc = include_directories(luajit.get_pkgconfig_variable('includedir'))
endif
subdir('subprojects/luabins/src')

dep_gl = dependency('gl', required: false)
if not dep_gl.found()
    if host_machine.system() == 'windows'
        dep_gl = cc.find_library('opengl32', required: false)
    else
        dep_gl = cc.find_library('GL', required: false)
    endif

    if not cc.has_header('GL/gl.h')
        dep_gl = dependency('', required: false)
    endif
endif
if host_machine.system() == 'darwin'
    conf.set('HAVE_OPENGL_GL_H', 1)
endif

if not dep_gl.found()
    error('OpenGL implementation not found')
endif

deps += dep_gl

# TODO: csri

acconf = configure_file(output: 'acconf.h', configuration: conf)

subdir('automation')
subdir('libaegisub')
subdir('packages')
subdir('po')
subdir('src')