from __future__ import print_function
import collections
import itertools
import json
import os
import os.path
import re
import shutil
import string
import subprocess
import sys
import html

class BuildDesc:
 def __init__(self, prepend_envs=None, variables=None, build_type=None, generator=None):
 self.prepend_envs = prepend_envs or [] # [ { "var": "value" } ]
 self.variables = variables or []
 self.build_type = build_type
 self.generator = generator

 def merged_with(self, build_desc):
 """Returns a new BuildDesc by merging field content.
 Prefer build_desc fields to self fields for single valued field.
 """
 return BuildDesc(self.prepend_envs + build_desc.prepend_envs,
 self.variables + build_desc.variables,
 build_desc.build_type or self.build_type,
 build_desc.generator or self.generator)

 def env(self):
 environ = os.environ.copy()
 for values_by_name in self.prepend_envs:
 for var, value in list(values_by_name.items()):
 var = var.upper()
 if type(value) is unicode:
 value = value.encode(sys.getdefaultencoding())
 if var in environ:
 environ[var] = value + os.pathsep + environ[var]
 else:
 environ[var] = value
 return environ

 def cmake_args(self):
 args = ["-D%s" % var for var in self.variables]
 # skip build type for Visual Studio solution as it cause warning
 if self.build_type and 'Visual' not in self.generator:
 args.append("-DCMAKE_BUILD_TYPE=%s" % self.build_type)
 if self.generator:
 args.extend(['-G', self.generator])
 return args

 def __repr__(self):
 return "BuildDesc(%s, build_type=%s)" % (" ".join(self.cmake_args()), self.build_type)

class BuildData:
 def __init__(self, desc, work_dir, source_dir):
 self.desc = desc
 self.work_dir = work_dir
 self.source_dir = source_dir
 self.cmake_log_path = os.path.join(work_dir, 'batchbuild_cmake.log')
 self.build_log_path = os.path.join(work_dir, 'batchbuild_build.log')
 self.cmake_succeeded = False
 self.build_succeeded = False

 def execute_build(self):
 print('Build %s' % self.desc)
 self._make_new_work_dir()
 self.cmake_succeeded = self._generate_makefiles()
 if self.cmake_succeeded:
 self.build_succeeded = self._build_using_makefiles()
 return self.build_succeeded

 def _generate_makefiles(self):
 print(' Generating makefiles: ', end=' ')
 cmd = ['cmake'] + self.desc.cmake_args() + [os.path.abspath(self.source_dir)]
 succeeded = self._execute_build_subprocess(cmd, self.desc.env(), self.cmake_log_path)
 print('done' if succeeded else 'FAILED')
 return succeeded

 def _build_using_makefiles(self):
 print(' Building:', end=' ')
 cmd = ['cmake', '--build', self.work_dir]
 if self.desc.build_type:
 cmd += ['--config', self.desc.build_type]
 succeeded = self._execute_build_subprocess(cmd, self.desc.env(), self.build_log_path)
 print('done' if succeeded else 'FAILED')
 return succeeded

 def _execute_build_subprocess(self, cmd, env, log_path):
 process = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.STDOUT, cwd=self.work_dir,
 env=env)
 stdout, _ = process.communicate()
 succeeded = (process.returncode == 0)
 with open(log_path, 'wb') as flog:
 log = ' '.join(cmd) + '\n' + stdout + '\nExit code: %r\n' % process.returncode
 flog.write(fix_eol(log))
 return succeeded

 def _make_new_work_dir(self):
 if os.path.isdir(self.work_dir):
 print(' Removing work directory', self.work_dir)
 shutil.rmtree(self.work_dir, ignore_errors=True)
 if not os.path.isdir(self.work_dir):
 os.makedirs(self.work_dir)

def fix_eol(stdout):
 """Fixes wrong EOL produced by cmake --build on Windows (\r\r\n instead of \r\n).
 """
 return re.sub('\r*\n', os.linesep, stdout)

def load_build_variants_from_config(config_path):
 with open(config_path, 'rb') as fconfig:
 data = json.load(fconfig)
 variants = data[ 'cmake_variants' ]
 build_descs_by_axis = collections.defaultdict(list)
 for axis in variants:
 axis_name = axis["name"]
 build_descs = []
 if "generators" in axis:
 for generator_data in axis["generators"]:
 for generator in generator_data["generator"]:
 build_desc = BuildDesc(generator=generator,
 prepend_envs=generator_data.get("env_prepend"))
 build_descs.append(build_desc)
 elif "variables" in axis:
 for variables in axis["variables"]:
 build_desc = BuildDesc(variables=variables)
 build_descs.append(build_desc)
 elif "build_types" in axis:
 for build_type in axis["build_types"]:
 build_desc = BuildDesc(build_type=build_type)
 build_descs.append(build_desc)
 build_descs_by_axis[axis_name].extend(build_descs)
 return build_descs_by_axis

def generate_build_variants(build_descs_by_axis):
 """Returns a list of BuildDesc generated for the partial BuildDesc for each axis."""
 axis_names = list(build_descs_by_axis.keys())
 build_descs = []
 for axis_name, axis_build_descs in list(build_descs_by_axis.items()):
 if len(build_descs):
 # for each existing build_desc and each axis build desc, create a new build_desc
 new_build_descs = []
 for prototype_build_desc, axis_build_desc in itertools.product(build_descs, axis_build_descs):
 new_build_descs.append(prototype_build_desc.merged_with(axis_build_desc))
 build_descs = new_build_descs
 else:
 build_descs = axis_build_descs
 return build_descs

HTML_TEMPLATE = string.Template('''<html>
<head>
 <title>$title</title>
 <style type="text/css">
 td.failed {background-color:#f08080;}
 td.ok {background-color:#c0eec0;}
 </style>
</head>
<body>
<table border="1">
<thead>
 <tr>
 <th>Variables</th>
 $th_vars
 </tr>
 <tr>
 <th>Build type</th>
 $th_build_types
 </tr>
</thead>
<tbody>
$tr_builds
</tbody>
</table>
</body></html>''')

def generate_html_report(html_report_path, builds):
 report_dir = os.path.dirname(html_report_path)
 # Vertical axis: generator
 # Horizontal: variables, then build_type
 builds_by_generator = collections.defaultdict(list)
 variables = set()
 build_types_by_variable = collections.defaultdict(set)
 build_by_pos_key = {} # { (generator, var_key, build_type): build }
 for build in builds:
 builds_by_generator[build.desc.generator].append(build)
 var_key = tuple(sorted(build.desc.variables))
 variables.add(var_key)
 build_types_by_variable[var_key].add(build.desc.build_type)
 pos_key = (build.desc.generator, var_key, build.desc.build_type)
 build_by_pos_key[pos_key] = build
 variables = sorted(variables)
 th_vars = []
 th_build_types = []
 for variable in variables:
 build_types = sorted(build_types_by_variable[variable])
 nb_build_type = len(build_types_by_variable[variable])
 th_vars.append('<th colspan="%d">%s</th>' % (nb_build_type, html.escape(' '.join(variable))))
 for build_type in build_types:
 th_build_types.append('<th>%s</th>' % html.escape(build_type))
 tr_builds = []
 for generator in sorted(builds_by_generator):
 tds = [ '<td>%s</td>\n' % html.escape(generator) ]
 for variable in variables:
 build_types = sorted(build_types_by_variable[variable])
 for build_type in build_types:
 pos_key = (generator, variable, build_type)
 build = build_by_pos_key.get(pos_key)
 if build:
 cmake_status = 'ok' if build.cmake_succeeded else 'FAILED'
 build_status = 'ok' if build.build_succeeded else 'FAILED'
 cmake_log_url = os.path.relpath(build.cmake_log_path, report_dir)
 build_log_url = os.path.relpath(build.build_log_path, report_dir)
 td = '<td class="%s"><a href="%s" class="%s">CMake: %s</a>' % ( build_status.lower(), cmake_log_url, cmake_status.lower(), cmake_status)
 if build.cmake_succeeded:
 td += '<br><a href="%s" class="%s">Build: %s</a>' % ( build_log_url, build_status.lower(), build_status)
 td += '</td>'
 else:
 td = '<td></td>'
 tds.append(td)
 tr_builds.append('<tr>%s</tr>' % '\n'.join(tds))
 html = HTML_TEMPLATE.substitute( title='Batch build report',
 th_vars=' '.join(th_vars),
 th_build_types=' '.join(th_build_types),
 tr_builds='\n'.join(tr_builds))
 with open(html_report_path, 'wt') as fhtml:
 fhtml.write(html)
 print('HTML report generated in:', html_report_path)

def main():
 usage = r"""%prog WORK_DIR SOURCE_DIR CONFIG_JSON_PATH [CONFIG2_JSON_PATH...]
Build a given CMake based project located in SOURCE_DIR with multiple generators/options.dry_run
as described in CONFIG_JSON_PATH building in WORK_DIR.

Example of call:
python devtools\batchbuild.py e:\buildbots\jsoncpp\build . devtools\agent_vmw7.json
"""
 from optparse import OptionParser
 parser = OptionParser(usage=usage)
 parser.allow_interspersed_args = True
# parser.add_option('-v', '--verbose', dest="verbose", action='store_true',
# help="""Be verbose.""")
 parser.enable_interspersed_args()
 options, args = parser.parse_args()
 if len(args) < 3:
 parser.error("Missing one of WORK_DIR SOURCE_DIR CONFIG_JSON_PATH.")
 work_dir = args[0]
 source_dir = args[1].rstrip('/\\')
 config_paths = args[2:]
 for config_path in config_paths:
 if not os.path.isfile(config_path):
 parser.error("Can not read: %r" % config_path)

 # generate build variants
 build_descs = []
 for config_path in config_paths:
 build_descs_by_axis = load_build_variants_from_config(config_path)
 build_descs.extend(generate_build_variants(build_descs_by_axis))
 print('Build variants (%d):' % len(build_descs))
 # assign build directory for each variant
 if not os.path.isdir(work_dir):
 os.makedirs(work_dir)
 builds = []
 with open(os.path.join(work_dir, 'matrix-dir-map.txt'), 'wt') as fmatrixmap:
 for index, build_desc in enumerate(build_descs):
 build_desc_work_dir = os.path.join(work_dir, '%03d' % (index+1))
 builds.append(BuildData(build_desc, build_desc_work_dir, source_dir))
 fmatrixmap.write('%s: %s\n' % (build_desc_work_dir, build_desc))
 for build in builds:
 build.execute_build()
 html_report_path = os.path.join(work_dir, 'batchbuild-report.html')
 generate_html_report(html_report_path, builds)
 print('Done')


if __name__ == '__main__':
 main()