project(
  'bindfs',
  'c',
  version: '0.0.0',
  default_options: ['warning_level=2', 'c_std=gnu11']
)

cc = meson.get_compiler('c')

# ---- Abhängigkeiten ----
# Bevorzuge FUSE2 (alte API), falle auf FUSE3 zurück.
fuse_dep = dependency('fuse', required: false)  # pkg-config: fuse (FUSE2)
if fuse_dep.found()
  add_project_arguments('-DFUSE_USE_VERSION=26', language: 'c')  # FUSE2 API
else
  fuse_dep = dependency('fuse3', required: true)
  add_project_arguments('-DFUSE_USE_VERSION=30', language: 'c')  # FUSE3 API
  add_project_arguments('-DBINDFS_USE_FUSE3', language: 'c')
endif

threads_dep = dependency('threads', required: true)
dl_dep      = cc.find_library('dl', required: true)
rt_dep      = cc.find_library('rt', required: false)
iconv_dep   = dependency('iconv', required: false)

deps = [fuse_dep, threads_dep, dl_dep]
if rt_dep.found()
  deps += rt_dep
endif
if iconv_dep.found()
  deps += iconv_dep
endif

# ---- Allgemeine Compiler-Flags ----
# GNU-Extensions (pipe2 etc.) & große Offsets.
add_project_arguments(
  '-D_GNU_SOURCE',
  '-D_FILE_OFFSET_BITS=64',
  # S_ISDIR etc.: stellt sicher, dass <sys/stat.h> überall drin ist
  '-include', 'sys/stat.h',
  language: 'c'
)

# ---- Feature-Checks (ersetzt configure.ac) ----
# Achtung: passende Includes pro Funktion setzen.
have_pipe2           = cc.has_function('pipe2',           prefix: '#include <unistd.h>')
have_posix_spawn     = cc.has_function('posix_spawn',     prefix: '#include <spawn.h>')
have_copy_file_range = cc.has_function('copy_file_range', prefix: '#include <unistd.h>')

# Utimens-Varianten – bindfs.c entscheidet anhand dieser Makros:
have_utimensat  = cc.has_function('utimensat',  prefix: '#define _GNU_SOURCE\n#include <sys/stat.h>\n#include <fcntl.h>')
have_lutimes    = cc.has_function('lutimes',    prefix: '#include <sys/time.h>')
have_futimesat  = cc.has_function('futimesat',  prefix: '#include <sys/time.h>\n#include <fcntl.h>\n#include <unistd.h>')

conf = configuration_data()
conf.set('HAVE_PIPE2',            have_pipe2)
conf.set('HAVE_POSIX_SPAWN',      have_posix_spawn)
conf.set('HAVE_COPY_FILE_RANGE',  have_copy_file_range)

# Diese drei sind wichtig, damit der #error in bindfs_utimens nicht triggert:
conf.set('HAVE_UTIMENSAT',  have_utimensat)
conf.set('HAVE_LUTIMES',    have_lutimes)
conf.set('HAVE_FUTIMESAT',  have_futimesat)

# Autotools-kompatible Makros, die der Code nutzt
conf.set_quoted('PACKAGE_NAME',    meson.project_name())
conf.set_quoted('PACKAGE_VERSION', meson.project_version())
conf.set_quoted('PACKAGE_STRING',  meson.project_name() + ' ' + meson.project_version())

# Exakt "config.h" erzeugen (liegt im Build-Root)
configure_file(output: 'config.h', configuration: conf)

# ---- Unterverzeichnisse ----
subdir('src')

# ---- Manpage installieren ----
install_data('src/bindfs.1', install_dir: get_option('mandir') / 'man1')