# Copyright 2015-2016 The Meson development team

# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at

#     http://www.apache.org/licenses/LICENSE-2.0

# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from __future__ import annotations

import sys, os
import subprocess
import shutil
import argparse
from ..mesonlib import MesonException, Popen_safe, is_windows, is_cygwin, split_args
from . import destdir_join
import typing as T

parser = argparse.ArgumentParser()

parser.add_argument('--sourcedir', dest='sourcedir')
parser.add_argument('--builddir', dest='builddir')
parser.add_argument('--subdir', dest='subdir')
parser.add_argument('--headerdirs', dest='headerdirs')
parser.add_argument('--mainfile', dest='mainfile')
parser.add_argument('--modulename', dest='modulename')
parser.add_argument('--moduleversion', dest='moduleversion')
parser.add_argument('--htmlargs', dest='htmlargs', default='')
parser.add_argument('--scanargs', dest='scanargs', default='')
parser.add_argument('--scanobjsargs', dest='scanobjsargs', default='')
parser.add_argument('--gobjects-types-file', dest='gobject_typesfile', default='')
parser.add_argument('--fixxrefargs', dest='fixxrefargs', default='')
parser.add_argument('--mkdbargs', dest='mkdbargs', default='')
parser.add_argument('--ld', dest='ld', default='')
parser.add_argument('--cc', dest='cc', default='')
parser.add_argument('--ldflags', dest='ldflags', default='')
parser.add_argument('--cflags', dest='cflags', default='')
parser.add_argument('--content-files', dest='content_files', default='')
parser.add_argument('--expand-content-files', dest='expand_content_files', default='')
parser.add_argument('--html-assets', dest='html_assets', default='')
parser.add_argument('--ignore-headers', dest='ignore_headers', default='')
parser.add_argument('--namespace', dest='namespace', default='')
parser.add_argument('--mode', dest='mode', default='')
parser.add_argument('--installdir', dest='install_dir')
parser.add_argument('--run', dest='run', default='')
for tool in ['scan', 'scangobj', 'mkdb', 'mkhtml', 'fixxref']:
    program_name = 'gtkdoc-' + tool
    parser.add_argument('--' + program_name, dest=program_name.replace('-', '_'))

def gtkdoc_run_check(cmd: T.List[str], cwd: str, library_paths: T.Optional[T.List[str]] = None) -> None:
    if library_paths is None:
        library_paths = []

    env = dict(os.environ)
    if is_windows() or is_cygwin():
        if 'PATH' in env:
            library_paths.extend(env['PATH'].split(os.pathsep))
        env['PATH'] = os.pathsep.join(library_paths)
    else:
        if 'LD_LIBRARY_PATH' in env:
            library_paths.extend(env['LD_LIBRARY_PATH'].split(os.pathsep))
        env['LD_LIBRARY_PATH'] = os.pathsep.join(library_paths)

    if is_windows():
        cmd.insert(0, sys.executable)

    # Put stderr into stdout since we want to print it out anyway.
    # This preserves the order of messages.
    p, out = Popen_safe(cmd, cwd=cwd, env=env, stderr=subprocess.STDOUT)[0:2]
    if p.returncode != 0:
        err_msg = [f"{cmd!r} failed with status {p.returncode:d}"]
        if out:
            err_msg.append(out)
        raise MesonException('\n'.join(err_msg))
    elif out:
        # Unfortunately Windows cmd.exe consoles may be using a codepage
        # that might choke print() with a UnicodeEncodeError, so let's
        # ignore such errors for now, as a compromise as we are outputting
        # console output here...
        try:
            print(out)
        except UnicodeEncodeError:
            pass

def build_gtkdoc(source_root: str, build_root: str, doc_subdir: str, src_subdirs: T.List[str],
                 main_file: str, module: str, module_version: str,
                 html_args: T.List[str], scan_args: T.List[str], fixxref_args: T.List[str], mkdb_args: T.List[str],
                 gobject_typesfile: str, scanobjs_args: T.List[str], run: str, ld: str, cc: str, ldflags: str, cflags: str,
                 html_assets: T.List[str], content_files: T.List[str], ignore_headers: T.List[str], namespace: str,
                 expand_content_files: T.List[str], mode: str, options: argparse.Namespace) -> None:
    print("Building documentation for %s" % module)

    src_dir_args = []
    for src_dir in src_subdirs:
        if not os.path.isabs(src_dir):
            dirs = [os.path.join(source_root, src_dir),
                    os.path.join(build_root, src_dir)]
        else:
            dirs = [src_dir]
        src_dir_args += ['--source-dir=' + d for d in dirs]

    doc_src = os.path.join(source_root, doc_subdir)
    abs_out = os.path.join(build_root, doc_subdir)
    htmldir = os.path.join(abs_out, 'html')

    content_files += [main_file]
    sections = os.path.join(doc_src, module + "-sections.txt")
    if os.path.exists(sections):
        content_files.append(sections)

    overrides = os.path.join(doc_src, module + "-overrides.txt")
    if os.path.exists(overrides):
        content_files.append(overrides)

    # Copy files to build directory
    for f in content_files:
        # FIXME: Use mesonlib.File objects so we don't need to do this
        if not os.path.isabs(f):
            f = os.path.join(doc_src, f)
        elif os.path.commonpath([f, build_root]) == build_root:
            continue
        shutil.copyfile(f, os.path.join(abs_out, os.path.basename(f)))

    shutil.rmtree(htmldir, ignore_errors=True)
    try:
        os.mkdir(htmldir)
    except Exception:
        pass

    for f in html_assets:
        f_abs = os.path.join(doc_src, f)
        shutil.copyfile(f_abs, os.path.join(htmldir, os.path.basename(f_abs)))

    scan_cmd = [options.gtkdoc_scan, '--module=' + module] + src_dir_args
    if ignore_headers:
        scan_cmd.append('--ignore-headers=' + ' '.join(ignore_headers))
    # Add user-specified arguments
    scan_cmd += scan_args
    gtkdoc_run_check(scan_cmd, abs_out)

    # Use the generated types file when available, otherwise gobject_typesfile
    # would often be a path to source dir instead of build dir.
    if '--rebuild-types' in scan_args:
        gobject_typesfile = os.path.join(abs_out, module + '.types')

    if gobject_typesfile:
        scanobjs_cmd = [options.gtkdoc_scangobj] + scanobjs_args
        scanobjs_cmd += ['--types=' + gobject_typesfile,
                         '--module=' + module,
                         '--run=' + run,
                         '--cflags=' + cflags,
                         '--ldflags=' + ldflags,
                         '--cc=' + cc,
                         '--ld=' + ld,
                         '--output-dir=' + abs_out]

        library_paths = []
        for ldflag in split_args(ldflags):
            if ldflag.startswith('-Wl,-rpath,'):
                library_paths.append(ldflag[11:])

        gtkdoc_run_check(scanobjs_cmd, build_root, library_paths)

    # Make docbook files
    if mode == 'auto':
        # Guessing is probably a poor idea but these keeps compat
        # with previous behavior
        if main_file.endswith('sgml'):
            modeflag = '--sgml-mode'
        else:
            modeflag = '--xml-mode'
    elif mode == 'xml':
        modeflag = '--xml-mode'
    elif mode == 'sgml':
        modeflag = '--sgml-mode'
    else: # none
        modeflag = None

    mkdb_cmd = [options.gtkdoc_mkdb,
                '--module=' + module,
                '--output-format=xml',
                '--expand-content-files=' + ' '.join(expand_content_files),
                ] + src_dir_args
    if namespace:
        mkdb_cmd.append('--name-space=' + namespace)
    if modeflag:
        mkdb_cmd.append(modeflag)
    if main_file:
        # Yes, this is the flag even if the file is in xml.
        mkdb_cmd.append('--main-sgml-file=' + main_file)
    # Add user-specified arguments
    mkdb_cmd += mkdb_args
    gtkdoc_run_check(mkdb_cmd, abs_out)

    # Make HTML documentation
    mkhtml_cmd = [options.gtkdoc_mkhtml,
                  '--path=' + os.pathsep.join((doc_src, abs_out)),
                  module,
                  ] + html_args
    if main_file:
        mkhtml_cmd.append('../' + main_file)
    else:
        mkhtml_cmd.append('%s-docs.xml' % module)
    # html gen must be run in the HTML dir
    gtkdoc_run_check(mkhtml_cmd, htmldir)

    # Fix cross-references in HTML files
    fixref_cmd = [options.gtkdoc_fixxref,
                  '--module=' + module,
                  '--module-dir=html'] + fixxref_args
    gtkdoc_run_check(fixref_cmd, abs_out)

    if module_version:
        shutil.move(os.path.join(htmldir, f'{module}.devhelp2'),
                    os.path.join(htmldir, f'{module}-{module_version}.devhelp2'))

def install_gtkdoc(build_root: str, doc_subdir: str, install_prefix: str, datadir: str, module: str) -> None:
    source = os.path.join(build_root, doc_subdir, 'html')
    final_destination = os.path.join(install_prefix, datadir, module)
    shutil.rmtree(final_destination, ignore_errors=True)
    shutil.copytree(source, final_destination)

def run(args: T.List[str]) -> int:
    options = parser.parse_args(args)
    if options.htmlargs:
        htmlargs = options.htmlargs.split('@@')
    else:
        htmlargs = []
    if options.scanargs:
        scanargs = options.scanargs.split('@@')
    else:
        scanargs = []
    if options.scanobjsargs:
        scanobjsargs = options.scanobjsargs.split('@@')
    else:
        scanobjsargs = []
    if options.fixxrefargs:
        fixxrefargs = options.fixxrefargs.split('@@')
    else:
        fixxrefargs = []
    if options.mkdbargs:
        mkdbargs = options.mkdbargs.split('@@')
    else:
        mkdbargs = []
    build_gtkdoc(
        options.sourcedir,
        options.builddir,
        options.subdir,
        options.headerdirs.split('@@'),
        options.mainfile,
        options.modulename,
        options.moduleversion,
        htmlargs,
        scanargs,
        fixxrefargs,
        mkdbargs,
        options.gobject_typesfile,
        scanobjsargs,
        options.run,
        options.ld,
        options.cc,
        options.ldflags,
        options.cflags,
        options.html_assets.split('@@') if options.html_assets else [],
        options.content_files.split('@@') if options.content_files else [],
        options.ignore_headers.split('@@') if options.ignore_headers else [],
        options.namespace,
        options.expand_content_files.split('@@') if options.expand_content_files else [],
        options.mode,
        options)

    if 'MESON_INSTALL_PREFIX' in os.environ:
        destdir = os.environ.get('DESTDIR', '')
        install_prefix = destdir_join(destdir, os.environ['MESON_INSTALL_PREFIX'])
        if options.install_dir:
            install_dir = options.install_dir
        else:
            install_dir = options.modulename
            if options.moduleversion:
                install_dir += '-' + options.moduleversion
        if os.path.isabs(install_dir):
            install_dir = destdir_join(destdir, install_dir)
        install_gtkdoc(options.builddir,
                       options.subdir,
                       install_prefix,
                       'share/gtk-doc/html',
                       install_dir)
    return 0

if __name__ == '__main__':
    sys.exit(run(sys.argv[1:]))
