project(
    'hsdbg',
    ['c', 'cpp'],
    version : '0.1.0',
    meson_version : '>= 1.1.0',
    default_options : [
        'c_std=c11',
        'cpp_std=c++23',
        # the vendored dependencies keep their own warnings off; hsdbg opts back
        # in explicitly below so the flag set matches what premake used
        'warning_level=0',
        'default_library=static',
    ],
)

cc = meson.get_compiler('c')
cpp = meson.get_compiler('cpp')

system = host_machine.system()
is_macos = system == 'darwin'
is_linux = system == 'linux'
is_windows = system == 'windows'
msvc = cpp.get_argument_syntax() == 'msvc'

python = find_program('python3', 'python')

# glfw cocoa is Objective-C; only pull in that toolchain where it is needed
if is_macos
    add_languages('objc', required : true, native : false)
endif

# tools/find_llvm.py carries the search logic (env, vendored ext/llvm,
# llvm-config, platform defaults) and prints KEY=value lines we parse here.
llvm_query = run_command(
    python, files('tools/find_llvm.py'), get_option('llvm_prefix'),
    check : false,
)

if llvm_query.returncode() != 0
    error(
        'no llvm with lldb headers found. install one and pass ' +
        '-Dllvm_prefix=<path> (or set $LLVM_PREFIX), or run ' +
        '`python3 tools/fetch_llvm.py` to download the pinned release, ' +
        'then reconfigure.'
    )
endif

llvm_prefix = ''
lldb_incdir = ''
lldb_libdir = ''
lldb_lib = ''
lldb_dlls = []

foreach line : llvm_query.stdout().strip().split('\n')
    if line.contains('=')
        pair = line.split('=')
        key = pair[0]
        value = pair[1]
        if key == 'prefix'
            llvm_prefix = value
        elif key == 'incdir'
            lldb_incdir = value
        elif key == 'libdir'
            lldb_libdir = value
        elif key == 'lib'
            lldb_lib = value
        elif key == 'dll'
            lldb_dlls += value
        endif
    endif
endforeach

message('using llvm/lldb at ' + llvm_prefix)

# lldb lives outside the source tree, so feed its include path through the
# compiler as a system dir (quiets its headers under our strict warnings) and
# link the resolved library by full path, exactly as premake did
if msvc
    lldb_inc_args = ['/I' + lldb_incdir]
else
    lldb_inc_args = ['-isystem', lldb_incdir]
endif

lldb_dep = declare_dependency(
    compile_args : lldb_inc_args,
    link_args : [lldb_lib],
)

glfw_inc = include_directories('ext/glfw/include')
glad_inc = include_directories('ext/glad/include')
imgui_inc = include_directories('ext/imgui', 'ext/imgui/backends')

# glfw
glfw_src = files(
    'ext/glfw/src/context.c',
    'ext/glfw/src/init.c',
    'ext/glfw/src/input.c',
    'ext/glfw/src/monitor.c',
    'ext/glfw/src/platform.c',
    'ext/glfw/src/vulkan.c',
    'ext/glfw/src/window.c',
    'ext/glfw/src/null_init.c',
    'ext/glfw/src/null_joystick.c',
    'ext/glfw/src/null_monitor.c',
    'ext/glfw/src/null_window.c',
)

if is_linux
    glfw_defines = ['-D_GLFW_X11']
    glfw_src += files(
        'ext/glfw/src/x11_init.c',
        'ext/glfw/src/x11_monitor.c',
        'ext/glfw/src/x11_window.c',
        'ext/glfw/src/xkb_unicode.c',
        'ext/glfw/src/wl_init.c',
        'ext/glfw/src/wl_monitor.c',
        'ext/glfw/src/wl_window.c',
        'ext/glfw/src/posix_module.c',
        'ext/glfw/src/posix_time.c',
        'ext/glfw/src/posix_thread.c',
        'ext/glfw/src/posix_poll.c',
        'ext/glfw/src/glx_context.c',
        'ext/glfw/src/egl_context.c',
        'ext/glfw/src/osmesa_context.c',
        'ext/glfw/src/linux_joystick.c',
    )
elif is_macos
    glfw_defines = ['-D_GLFW_COCOA']
    glfw_src += files(
        'ext/glfw/src/cocoa_init.m',
        'ext/glfw/src/cocoa_joystick.m',
        'ext/glfw/src/cocoa_monitor.m',
        'ext/glfw/src/macos_time.c',
        'ext/glfw/src/cocoa_window.m',
        'ext/glfw/src/nsgl_context.m',
        'ext/glfw/src/egl_context.c',
        'ext/glfw/src/osmesa_context.c',
        'ext/glfw/src/posix_module.c',
        'ext/glfw/src/posix_thread.c',
    )
elif is_windows
    glfw_defines = ['-D_GLFW_WIN32', '-D_CRT_SECURE_NO_WARNINGS']
    glfw_src += files(
        'ext/glfw/src/win32_init.c',
        'ext/glfw/src/win32_joystick.c',
        'ext/glfw/src/win32_module.c',
        'ext/glfw/src/win32_monitor.c',
        'ext/glfw/src/win32_thread.c',
        'ext/glfw/src/win32_time.c',
        'ext/glfw/src/win32_window.c',
        'ext/glfw/src/wgl_context.c',
        'ext/glfw/src/egl_context.c',
        'ext/glfw/src/osmesa_context.c',
    )
else
    glfw_defines = []
endif

glfw = static_library(
    'glfw',
    glfw_src,
    c_args : glfw_defines,
    objc_args : is_macos ? glfw_defines : [],
    include_directories : glfw_inc,
    override_options : ['warning_level=0'],
)
glfw_dep = declare_dependency(
    link_with : glfw,
    include_directories : glfw_inc,
)

# glad
glad = static_library(
    'glad',
    files('ext/glad/src/gl.c'),
    include_directories : glad_inc,
    override_options : ['warning_level=0'],
)
glad_dep = declare_dependency(
    link_with : glad,
    include_directories : glad_inc,
)

# imgui (+ glfw / opengl3 backends)
imgui_args = ['-DGLFW_INCLUDE_NONE']
if is_macos
    imgui_args += '-DGL_SILENCE_DEPRECATION'
elif is_windows
    imgui_args += '-D_CRT_SECURE_NO_WARNINGS'
endif

imgui = static_library(
    'imgui',
    files(
        'ext/imgui/imgui.cpp',
        'ext/imgui/imgui_draw.cpp',
        'ext/imgui/imgui_tables.cpp',
        'ext/imgui/imgui_widgets.cpp',
        'ext/imgui/imgui_demo.cpp',
        'ext/imgui/misc/cpp/imgui_stdlib.cpp',
        'ext/imgui/backends/imgui_impl_glfw.cpp',
        'ext/imgui/backends/imgui_impl_opengl3.cpp',
    ),
    cpp_args : imgui_args,
    include_directories : [imgui_inc, glfw_inc],
    override_options : ['warning_level=0'],
)
imgui_dep = declare_dependency(
    link_with : imgui,
    include_directories : imgui_inc,
)

hsdbg_src = files(
    'src/main.cpp',
    'src/ui/ui.cpp',
    'src/ui/ui_preferences.cpp',
    'src/ui/profiler.cpp',
    'src/ui/preferences.cpp',
    'src/ui/theme.cpp',
    'src/ui/image_renderer.cpp',
    'src/ui/macro_expander.cpp',
    'src/ui/widgets.cpp',
    'src/ui/source_view.cpp',
    'src/ui/animated_image.cpp',
    'src/core/log.cpp',
    'src/core/window.cpp',
    'src/core/window_manager.cpp',
    'src/core/application.cpp',
    'src/debugger/debugger.cpp',
)

asset_dir = meson.project_source_root().replace('\\', '/') + '/assets'

hsdbg_defines = [
    '-DGLFW_INCLUDE_NONE',
    '-D_CRT_SECURE_NO_WARNINGS',
    '-DHSDBG_LLVM_PREFIX="' + llvm_prefix + '"',
    '-DHSDBG_ASSET_DIR="' + asset_dir + '"',
    '-DHSDBG_VERSION="' + meson.project_version() + '"',
]

if is_windows
    hsdbg_defines += '-DHSDBG_WINDOWS'
elif is_linux
    hsdbg_defines += '-DHSDBG_LINUX'
elif is_macos
    hsdbg_defines += '-DHSDBG_MACOS'
endif

# dist is a stripped release build; premake keyed its HSDBG_DIST off that
# configuration, so tie it to disabled asserts (-Db_ndebug=true)
ndebug = get_option('b_ndebug')
is_dist = ndebug == 'true' or (
    ndebug == 'if-release'
    and get_option('buildtype') in ['release', 'plain']
)
if is_dist
    hsdbg_defines += '-DHSDBG_DIST'
endif

hsdbg_warnings = []
if not msvc
    hsdbg_warnings = [
        '-Wall',
        '-Wextra',
        '-Wpedantic',
        '-Wconversion',
        '-Wsign-conversion',
        '-Wshadow',
    ]
endif

# match premake's frame-pointer preservation whenever a sanitizer is active
if get_option('b_sanitize') != 'none'
    hsdbg_warnings += '-fno-omit-frame-pointer'
endif

hsdbg_deps = [lldb_dep, glfw_dep, glad_dep, imgui_dep]

if is_macos
    hsdbg_deps += dependency(
        'appleframeworks',
        modules : [
            'Cocoa',
            'IOKit',
            'CoreFoundation',
            'CoreVideo',
            'OpenGL',
            'QuartzCore',
        ],
    )
elif is_linux
    hsdbg_deps += dependency('gl')
    hsdbg_deps += dependency('threads')
    hsdbg_deps += cc.find_library('dl')
    hsdbg_deps += cc.find_library('m')
elif is_windows
    hsdbg_deps += cc.find_library('opengl32')
endif

# on unix the loader needs to find liblldb at runtime; on windows we stage the
# runtime dlls next to the executable instead (below)
hsdbg_rpath = is_windows ? '' : lldb_libdir

hsdbg = executable(
    'hsdbg',
    hsdbg_src,
    include_directories : include_directories('src', 'ext/stb'),
    cpp_args : hsdbg_defines + hsdbg_warnings,
    dependencies : hsdbg_deps,
    build_rpath : hsdbg_rpath,
)

if is_windows and lldb_dlls.length() > 0
    # stage the lldb / python runtime dlls beside hsdbg.exe (top-level targets
    # land in the build root), mirroring premake's postbuild copies
    custom_target(
        'llvm-runtime',
        command : [
            python,
            files('tools/copy_files.py'),
            '@OUTPUT@',
            meson.project_build_root(),
        ] + lldb_dlls,
        output : 'llvm-runtime.stamp',
        build_by_default : true,
    )
endif

run_target('fetch-llvm', command : [python, files('tools/fetch_llvm.py')])

cppcheck = find_program('cppcheck', required : false)
if cppcheck.found()
    # meson emits compile_commands.json into the build dir, so no bear needed;
    # analyse the configured build type (use a release/dist build dir to mirror
    # premake, which checked the dist configuration)
    run_target(
        'cppcheck',
        command : [
            cppcheck,
            '--project=' + meson.project_build_root() / 'compile_commands.json',
            '-i', meson.project_source_root() / 'ext',
            '--suppress=*:*/ext/*',
            '--inline-suppr',
            '--enable=warning,style,performance,portability',
            '--error-exitcode=1',
        ],
    )
endif