#!/usr/bin/python3
"""
This is a packager bot for ruby modules from rubygems.org
"""
# ******************************************************************************
# Copyright (c) Huawei Technologies Co., Ltd. 2020-2020. All rights reserved.
# licensed under the Mulan PSL v2.
# You can use this software according to the terms and conditions of the Mulan PSL v2.
# You may obtain a copy of Mulan PSL v2 at:
#     http://license.coscl.org.cn/MulanPSL2
# THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND, EITHER EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT, MERCHANTABILITY OR FIT FOR A PARTICULAR
# PURPOSE.
# See the Mulan PSL v2 for more details.
# Author: BruceGW
# Create: 2020-07-31
# Description: provide a tool to package ruby module automatically
# ******************************************************************************/

import urllib
import urllib.request
from pprint import pprint
from os import path
import json
import sys
import re
import datetime
import argparse
import subprocess
import os
import platform
from pathlib import Path
import yaml

json_file_template = '{pkg_name}.json'
name_tag_template = 'Name:\t\t{pkg_name}'
summary_tag_template = 'Summary:\t{pkg_sum}'
version_tag_template = 'Version:\t{pkg_ver}'
release_tag_template = 'Release:\t1'
license_tag_template = 'License:\t{pkg_lic}'
home_tag_template = 'URL:\t\t{pkg_home}'
source_tag_template = 'Source0:\t{pkg_source}'

buildreq_tag_template = 'BuildRequires:\t{req}'


class RubyPorter:
    __url_template_v1 = 'https://rubygems.org/api/v1/gems/{gem_name}.json'
    __url_template_v2 = 'https://rubygems.org/api/v2/rubygems/{gem_name}/versions/{version}.json'
    __json = None
    __gem_name = ""
    __spec_name = ""
    __pkg_name = ""
    __summary = ""
    __latest_v = ""
    __build_noarch = True  

    def __init__(self, pkg):
        """
        receive json from rubygems.org
        """
        url_v1 = self.__url_template_v1.format(gem_name=pkg)
        with urllib.request.urlopen(url_v1) as response:
            self.__json = json.loads(response.read().decode('utf-8')) 
            
        if self.__json is not None:
            self.__gem_name = self.__json["name"]
            self.__spec_name = "rubygem-" + self.__gem_name
            self.__pkg_name = self.__spec_name
            self.__latest_v = self.__json["version"]

    def get_spec_name(self):
        return self.__spec_name

    def get_module_name(self):
        return self.__gem_name

    def get_pkg_name(self):
        return self.__pkg_name

    def get_version(self):
        return self.__json["version"]

    def get_summary(self):
        if not self.__summary:
            url_v2 = self.__url_template_v2.format(gem_name=self.__gem_name, version=self.__latest_v)
            with urllib.request.urlopen(url_v2) as response:
                data = json.loads(response.read().decode('utf-8'))
                if data is not None:
                    self.__summary = data["summary"]
        
        return self.__summary

    def get_home(self):
        return self.__json["homepage_uri"]

    def get_license(self):
        if self.__json["licenses"] is not None:
            return ", ".join(self.__json["licenses"])
        return ""

    def get_source_url(self):
        """
        return URL for source file for the latest version
        """
        return self.__json["gem_uri"]

    def get_requires(self):
        """
        return all runtime requires
        """
        runtime_deps = self.__json["dependencies"]["runtime"]
        for item in runtime_deps:
            print("Requires:\t" + "rubygem-" + item["name"])


    def set_buildarch(self):
        subprocess.call(["gem", "fetch", self.__gem_name, "-v", self.__latest_v])
        s_url = porter.get_source_url()
        gem_file = s_url.split("/")[-1]
        output = subprocess.check_output(["gem", "specification", gem_file])
        data = output.decode("UTF-8")
        if 'extensions: []' not in data:
            self.__build_noarch = False

    def is_build_noarch(self):
        return self.__build_noarch

    def get_buildarch(self):
        if (self.__build_noarch == True):
            print("BuildArch:\tnoarch")

    def get_description(self):
        """
        return description.
        For empty description, use summary instead.
        """
        desc = self.__json["info"]
        if desc is None:
            return self.__json["summary"]
        else:
            return desc

    def get_build_requires(self):
        req_list = []
        deps = self.__json["dependencies"]["development"]
        for dep in deps:
            req_list.append("rubygem-" + dep["name"])
        return req_list

    def prepare_build_requires(self):
        print(buildreq_tag_template.format(req='ruby'))
        print(buildreq_tag_template.format(req='ruby-devel'))
        print(buildreq_tag_template.format(req='rubygems'))
        print(buildreq_tag_template.format(req='rubygems-devel'))
        if not self.__build_noarch:
            print(buildreq_tag_template.format(req='gcc'))
            print(buildreq_tag_template.format(req='gdb'))

    def prepare_pkg_build(self):
        print("gem build {name}.gemspec".format(name=porter.get_module_name()))
        print("%gem_install")

    def prepare_pkg_install(self):
        print("mkdir -p %{buildroot}%{gem_dir}")
        print("cp -a .%{gem_dir}/* %{buildroot}%{gem_dir}/")
        print("rm -rf %{buildroot}%{gem_instdir}/.gitignore")
        print("rm -rf %{buildroot}%{gem_instdir}/.travis.yml")

        print("if [ -d .%{_bindir} ]; then")
        print("\tmkdir -p %{buildroot}%{_bindir}")
        print("\tcp -a .%{_bindir}/* %{buildroot}%{_bindir}/")
        print("fi")

        print("if [ -d ext ]; then")
        print("\tmkdir -p %{buildroot}%{gem_extdir_mri}/%{gem_name}")
        print("\tcp -a .%{gem_extdir_mri}/%{gem_name}/*.so %{buildroot}%{gem_extdir_mri}/%{gem_name}")
        print("\tcp -a .%{gem_extdir_mri}/gem.build_complete %{buildroot}%{gem_extdir_mri}/")
        print("\trm -rf %{buildroot}%{gem_instdir}/ext/")
        print("fi")

        print("pushd %{buildroot}")
        print("touch filelist.lst")
        print("if [ -d %{buildroot}%{_bindir} ]; then")
        print("\tfind .%{_bindir} -type f -printf \"/%h/%f\\n\" >> filelist.lst")
        print("fi")
        print("popd")
        print("mv %{buildroot}/filelist.lst .")

    def prepare_pkg_files(self):
        print("%dir %{gem_instdir}")
        print("%{gem_instdir}/*")
        if not self.is_build_noarch():
            print("%{gem_extdir_mri}")
        print("%exclude %{gem_cache}")
        print("%{gem_spec}")

    def prepare_doc_files(self):
        print("%{gem_docdir}/*")

    def store_json(self, spath):
        """
        save json file
        """
        fname = json_file_template.format(pkg_name=self.__pkg_name)
        json_file = os.path.join(spath, fname)

        # if file exist, do nothing
        if path.exists(json_file) and path.isfile(json_file):
            with open(json_file, 'r') as f:
                resp = json.load(f)
        else:
            with open(json_file, 'w') as f:
                json.dump(self.__json, f)


def download_source(porter, tgtpath):
    """
    download source file from url, and save it to target path
    """
    if not os.path.exists(tgtpath):
        print("download path %s does not exist\n", tgtpath)
        return False
    s_url = porter.get_source_url()
    return subprocess.call(["wget", s_url, "-P", tgtpath])


def prepare_rpm_build_env(root):
    """
    prepare environment for rpmbuild
    """
    if not os.path.exists(root):
        print("Root path %s does not exist\n" & buildroot)
        return ""

    buildroot = os.path.join(root, "rpmbuild")
    if not os.path.exists(buildroot):
        os.mkdir(buildroot)

    for sdir in ['SPECS', 'BUILD', 'SOURCES', 'SRPMS', 'RPMS', 'BUILDROOT']:
        bpath = os.path.join(buildroot, sdir)
        if not os.path.exists(bpath):
            os.mkdir(bpath)

    return buildroot


def build_package(specfile):
    """
    build rpm package with rpmbuild
    """
    ret = subprocess.call(["rpmbuild", "-ba", specfile])
    return ret


def build_install_rpm(porter, rootpath):
    ret = build_rpm(porter, rootpath)
    if ret != "":
        return ret

    arch = "noarch"
    if porter.is_build_noarch():
        arch = "noarch"
    else:
        arch = platform.machine()

    pkgname = os.path.join(rootpath, "rpmbuild", "RPMS", arch, porter.get_pkg_name() + "*")
    ret = subprocess.call(["rpm", "-ivh", pkgname])
    if ret != 0:
        return "Install failed\n"

    return ""


def build_rpm(porter, rootpath):
    """
    full process to build rpm, do not need building dependency check here, do it in pkgporter
    """
    buildroot = prepare_rpm_build_env(rootpath)
    if buildroot == "":
        return False

    specfile = os.path.join(buildroot, "SPECS", porter.get_spec_name() + ".spec")

    build_spec(porter, specfile)

    download_source(porter, os.path.join(buildroot, "SOURCES"))

    build_package(specfile)

    return ""


def build_spec(porter, output):
    """
    print out the spec file
    """
    porter.set_buildarch()

    if os.path.isdir(output):
        output = os.path.join(output, porter.get_spec_name() + ".spec")
    tmp = sys.stdout
    if output != "":
        sys.stdout = open(output, 'w+')

    print("%global _empty_manifest_terminate_build 0")
    print("%global gem_name " + porter.get_module_name())
    print(name_tag_template.format(pkg_name=porter.get_spec_name()))
    print(version_tag_template.format(pkg_ver=porter.get_version()))
    print(release_tag_template)
    print(summary_tag_template.format(pkg_sum=porter.get_summary()))
    print(license_tag_template.format(pkg_lic=porter.get_license()))
    print(home_tag_template.format(pkg_home=porter.get_home()))
    print(source_tag_template.format(pkg_source=porter.get_source_url()))
    porter.get_buildarch()
    print("")
    porter.get_requires()
    porter.prepare_build_requires()
    print("Provides:\t" + porter.get_spec_name())
    print("")
    print("%description")
    print(porter.get_description())
    print("")

    print("%package help")
    print("Summary:\tDevelopment documents and examples for {name}".format(name=porter.get_module_name()))
    print("Provides:\t{name}-doc".format(name=porter.get_pkg_name()))
    print("BuildArch: noarch")
    print("")
    print("%description help")
    print(porter.get_description())
    print("")
    print("%prep")
    print("%autosetup -n {name}-{ver}".format(name=porter.get_module_name(), ver=porter.get_version()))
    print("gem spec %{SOURCE0} -l --ruby > " + porter.get_module_name() + ".gemspec")
    print("")
    print("%build")
    porter.prepare_pkg_build()
    print("")
    print("%install")
    porter.prepare_pkg_install()
    print("")

    print("%files -n {name} -f filelist.lst".format(name=porter.get_pkg_name()))
    porter.prepare_pkg_files()
    print("")
    print("%files help")
    porter.prepare_doc_files()
    print("")
    print("%changelog")
    date_str = datetime.date.today().strftime("%a %b %d %Y")
    print("* {today} Ruby_Bot <Ruby_Bot@openeuler.org>".format(today=date_str))
    print("- Package Spec generated")

    sys.stdout = tmp


def do_args(root):
    parser = argparse.ArgumentParser()

    parser.add_argument("-s", "--spec", help="Create spec file", action="store_true")
    parser.add_argument("-R", "--requires", help="Get required ruby modules", action="store_true")
    parser.add_argument("-b", "--build", help="Build rpm package", action="store_true")
    parser.add_argument("-B", "--buildinstall", help="Build&Install rpm package", action="store_true")
    parser.add_argument("-r", "--rootpath", help="Build rpm package in root path", type=str, default=dft_root_path)
    parser.add_argument("-d", "--download", help="Download source file indicated path", action="store_true")
    parser.add_argument("-p", "--path", help="indicated path to store files", type=str, default=os.getcwd())
    parser.add_argument("-j", "--json", help="Get Package JSON info", action="store_true")
    parser.add_argument("-o", "--output", help="Output to file", type=str, default="")
    parser.add_argument("pkg", type=str, help="The Ruby Gem Name")

    return parser


if __name__ == "__main__":
    dft_root_path = os.path.join(str(Path.home()))
    parser = do_args(dft_root_path)
    args = parser.parse_args()
    porter = RubyPorter(args.pkg)
    
    if args.requires:
        req_list = porter.get_build_requires()
        if not req_list:
            print("No building requires")
        else:
            for req in req_list:
                print(req)
        
    elif args.spec:
        build_spec(porter, args.output)
    elif args.build:
        ret = build_rpm(porter, args.rootpath)
        if ret != "":
            print("build failed : BuildRequire : %s\n" % ret)
            sys.exit(1)
    elif args.buildinstall:
        ret = build_install_rpm(porter, args.rootpath)
        if ret != "":
            print("Build & install failed\n")
            sys.exit(1)
    elif args.download:
        download_source(porter, args.path)
    elif args.json:
        porter.store_json(args.path)