#!/usr/bin/env python

#
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements.  See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You 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.
#

import os
import sys
import platform
import argparse
import shlex
import subprocess
import re

# the default openwhisk location in openwhisk checkouts
defaultOpenwhisk = os.path.dirname(os.path.realpath(__file__)) + '/../../'
# the openwhisk env var overrides if it exists
whiskHome = os.getenv('WHISK_HOME', defaultOpenwhisk)

def main():
    args = getArgs()

    if (not args.build and
        not args.teardown and
        not args.deploy):
        args.build = True
        args.teardown = True
        args.deploy = True

    # args.dir is either explicitly set or default to openwhisk home per environment
    wskhome = args.dir
    # change to wsk home to use build/deploy scripts
    os.chdir(wskhome)

    props = {}
    props['ENV'] = args.target
    props['WSK_HOME'] = wskhome
    props['MAIN_DOCKER_ENDPOINT'] = getDockerHost()
    doComponentSequence(props, args, args.components)

def doComponentSequence(props, args, components):
    for c in components:
        component = getComponent(c)
        if not component:
            if args.yaml:
                file = c if c.endswith('.yml') else '%s.yml' % c
                component = makeComponent('custom deployment', 'deploying using %s' % file, yaml = file, modes = 'clean')
            elif args.gradle:
                file = c if c.endswith('.gradle') else '%s.gradle' % c
                component = makeComponent('custom build target', 'building using %s' % file, yaml = False, gradle = True, tasks = c)
            else:
                print('unknown component %s' % c)
                exit(1)

        if component['steps']:
            doComponentSequence(props, args, component['steps'])
        else:
            doOne(component, args, props)

def getArgs():
    def detectDeployTarget():
        osname = platform.system()
        if osname == 'Linux':
            return 'local'
        elif osname == 'Darwin':
            if os.getenv('DOCKER_HOST', None) is not None:
                # docker-machine typically has docker host set in the environment
                return 'docker-machine'
            else:
                # otherwise assume docker-for-mac
                return 'local'
        else:
            return None

    parser = argparse.ArgumentParser(description='[re]build and [re]deploy a whisk component if no args are given, otherwise do what is instructed')
    parser.add_argument('-b', '--build', help='build component', action='store_const', const=True, default=False)
    parser.add_argument('-x', '--teardown', help='teardown component', action='store_const', const=True, default=False)
    parser.add_argument('-d', '--deploy', help='deploy component', action='store_const', const=True, default=False)
    parser.add_argument('-t', '--target', help='deploy target (one of [docker-machine, local])', default=detectDeployTarget())
    parser.add_argument('-y', '--yaml', help='deploy target using inferred YAML file if component is not one of known targets', action='store_const', const=True, default=False)
    parser.add_argument('-g', '--gradle', help='use target using inferred gradle file if component is not one of known targets', action='store_const', const=True, default=False)
    parser.add_argument('-n', '--just-print', help='prints the component configuration but does not run any targets', action='store_const', const=True, default=False, dest='skiprun')
    parser.add_argument('-c', '--list-components', help='list known component names and exit', action='store_const', const=True, default=False, dest='list')
    parser.add_argument('-a', '--additional-task-arguments', dest='extraArgs', action='append', help='pass additional arguments to gradle build')
    parser.add_argument('-e', '--extra-ansible-vars', dest='extraAnsibleVars', action='append', help='pass extra vars to ansible-playbook')
    parser.add_argument('components', nargs = '*', help='component name(s) to run (in order specified if more than one)')
    parser.add_argument('--dir', help='whisk home directory')

    args = parser.parse_args()

    if args.target is None:
        print('Use "--target" to specify a deployment target because one '
              'could not be determined automatically for your platform '
              '(supported platforms are GNU/Linux (Ubuntu) and Mac OS X.')
        exit(-1)

    if args.dir is None:
        if whiskHome is None:
            print('Must specify whisk home directory with "--dir".')
            exit(-1)
        else:
            args.dir = whiskHome

    if args.list:
        print("{:<27}{:<40}".format(bold('component'), bold('description')))
        for c in Components:
            print("{:<30}{:<40}".format(hilite(c['name']), c['description']))
        exit(0)
    elif not args.components:
        parser.print_usage()
        exit(0)
    else:
        return args

class Playbook:
    cmd = 'ansible-playbook'

    dir = False
    file = False
    modes = False
    env = False

    # dir: the ansible directory containing the yaml files, roles, etc.
    # file: the yml file for the playbook
    # modes: the modes supported for the playbook as a comma separated string (e.g., 'clean')
    # env: the environments directory (e.g., 'environment) or None if not environment specific playbook
    def __init__(self, dir, file, modes, env):
        self.dir = dir
        self.file = file
        self.modes = modes.split(',')
        self.env = env

    def path(self, basedir):
        return basedir + '/' + self.dir

    def execcmd(self, props, mode = False, extraAnsibleVars = []):
        if self.dir and self.file and (mode is False or mode in self.modes):
            cmd = [ self.cmd ]
            if self.env:
                cmd.append('-i %s/%s' % (self.env, props['ENV']))
            cmd.append(self.file)
            if mode:
                cmd.append('-e mode=%s' % mode)
            if extraAnsibleVars:
                cmd.append(' '.join(map(lambda x: "-e '" + str(x) + "'", extraAnsibleVars)))
            return ' '.join(cmd)

class Gradle:
    cmd = 'gradlew'

    tasks = False
    components = False

    def __init__(self, tasks, components = False):
        self.tasks = tasks.split(',')
        self.components = components

    def execcmd(self, props, task, extraArgs = ''):
        if task:
            if self.components and self.components is not True:
                parts = map(lambda c: '%s:%s' % (c, task), self.components.split(','))
                parts = ' '.join(parts)
            else:
                parts = task

            dh = props['MAIN_DOCKER_ENDPOINT']
            return '%s %s %s --parallel %s' % (
                   props['WSK_HOME'] + '/' + self.cmd,
                   parts,
                   extraArgs,
                   ('-PdockerHost=%s' % dh) if dh else '')

def getDockerHost():
    dh = os.getenv('DOCKER_HOST')
    if dh is not None and dh.startswith('tcp://'):
        return dh[6:]

def makeComponent(name,                   # component name, implies playbook default and gradle tasks roots
                  description,
                  yaml = True,            # true for default file name else the file name
                  modes = '',
                  env = 'environments',
                  dir = 'ansible',
                  gradle = False,         # gradle buildable iff true
                  tasks = 'distDocker',
                  steps = None):          # comma separated, runs these steps in sequence, each step is a reference to another component (yaml/gradle not allowed)
    yaml = ('%s.yml' % name) if yaml is True else yaml
    playbook = Playbook(dir, yaml, modes, env) if yaml is not False else None
    gradle = Gradle(tasks, gradle) if gradle is not False else None
    if steps and (playbook is not None or gradle is not None):
        print('Cannot create component "%s" with a sequence of steps and also '
              'a playbook with gradle build target' % name)
        exit(-1)
    elif steps:
        steps = map(lambda c: c.strip(), steps.split(','))
    return { 'name': name, 'description': description, 'playbook': playbook, 'gradle': gradle, 'steps': steps }

Components = [
    makeComponent('fresh',
                  'setup, build, and deploy a fresh whisk system using couchdb',
                  yaml = False,
                  steps = 'setup, couchdb, initdb, wipedb, deploy, catalog'),

    makeComponent('fmt',
                  'apply source code formats',
                  gradle = True,
                  yaml = False,
                  tasks = 'scalafmtAll'),

    makeComponent('setup',
                  'system setup'),

    makeComponent('prereq',
                  'install requisites'),

    makeComponent('couchdb',
                  'deploy couchdb',
                  modes = 'clean'),

    makeComponent('initdb',
                  'initialize db with guest/system keys'),

    makeComponent('wipedb',
                  'recreate main db for entities',
                  yaml = 'wipe.yml'),

    makeComponent('elasticsearch',
                  'deploy elasticsearch',
                  modes = 'clean'),

    makeComponent('mongodb',
                  'deploy mongodb',
                  modes = 'clean'),

    makeComponent('initMongoDB',
                  'initialize mongodb with guest/system keys'),

    makeComponent('build',
                  'build system',
                  yaml = False,
                  gradle = True),

    makeComponent('deploy',
                  'build/deploy system',
                  yaml = 'openwhisk.yml',
                  modes = 'clean',
                  gradle = True),

    makeComponent('teardown',
                  'teardown all deployed containers',
                  yaml = 'teardown.yml'),

    makeComponent('kafka',
                  'build/deploy kafka',
                  modes = 'clean'),

    makeComponent('controller',
                  'build/deploy controller',
                  modes = 'clean',
                  gradle = 'core:controller'),

    makeComponent('invoker',
                  'build/deploy invoker',
                  modes = 'clean',
                  gradle = ':core:invoker'),

    makeComponent('edge',
                  'deploy edge'),

    makeComponent('cli',
                  'download cli from api host',
                  modes = 'clean',
                  yaml = 'downloadcli.yml'),

    makeComponent('catalog',
                  'install catalog',
                  yaml = 'postdeploy.yml'),

    makeComponent('apigw',
                  'deploy api gateway',
                  gradle = False,
                  modes = 'clean',
                  yaml = 'routemgmt.yml apigateway.yml'),

    # the following (re)build images via gradle
    makeComponent('runtime:([\w.-]+)',
                  'build a runtime action container, matching name using the regex; NOTE: must use --dir for path to runtime directory',
                  yaml = False,
                  gradle = 'core:$1:distDocker'),

    makeComponent('actionproxy',
                  'build action proxy container',
                  yaml = False,
                  gradle = 'tools:actionProxy'),

    # required for tests
    makeComponent('props',
                  'build whisk.properties file (required for tests)',
                  yaml = 'properties.yml'),

    # convenient to run all tests
    makeComponent('tests',
                  'run all tests',
                  yaml = False,
                  gradle = True,
                  tasks = 'test'),

    makeComponent('unit-tests',
                  'run units tests',
                  yaml = False,
                  tasks = 'testUnit',
                  gradle = 'tests'),

    makeComponent('standalone',
                  'run standalone server',
                  yaml = False,
                  tasks = 'bootRun',
                  gradle = 'core:standalone')
]

def getComponent(component):
    for c in Components:
        if c['name'] == component:
            return c
        else:
            parts = re.match(c['name'], component)
            if parts:
                name = parts.group(1)
                return makeComponent('runtime:' + name,
                          'build a ' + name + ' runtime action container',
                          yaml = False,
                          gradle = 'core:' + name)

    return False

def bold(string):
    if sys.stdin.isatty():
        attr = []
        attr.append('1')
        return '\x1b[%sm%s\x1b[0m' % (';'.join(attr), string)
    else:
        return string

def hilite(string, isError = False):
    if sys.stdin.isatty():
        attr = []
        attr.append('34' if not isError else '31')  # blue or red if isError
        attr.append('1')
        return '\x1b[%sm%s\x1b[0m' % (';'.join(attr), string)
    else:
        return string

def run(cmd, dir, skiprun, allowToFail = False):
    if cmd is not None:
        print(hilite(cmd))
        if not skiprun:
            args = shlex.split(cmd)
            p = subprocess.Popen(args, cwd = dir)
            p.wait()
            if p.returncode and not allowToFail:
               abort('command failed', p.returncode)

def runAndGetStdout(cmd):
    print(hilite(cmd))
    args = shlex.split(cmd)
    p = subprocess.Popen(args, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
    out, err = p.communicate()
    # stdout/stderr may be either text or bytes, depending on Python
    # version.   In the latter case, decode to text.
    if isinstance(out, bytes):
        out = out.decode('utf-8')
    if isinstance(err, bytes):
        err = err.decode('utf-8')
    if p.returncode:
        print(hilite(out))
        print(hilite(err, True))
        abort('command failed', p.returncode)
    return out

def abort(msg, code = -1):
    print(hilite(msg, True))
    exit(code)

def doOne(component, args, props):
    basedir = props['WSK_HOME']
    playbook = component['playbook']
    gradle = component['gradle']
    print(bold(component['description']))

    extraArgs = '' if args.extraArgs is None or [] else ' '.join(map(str, args.extraArgs))

    if args.build and gradle is not None:
        cmd = gradle.execcmd(props, gradle.tasks[0], extraArgs)
        run(cmd, basedir, args.skiprun)

    if args.teardown and playbook is not None:
        cmd = playbook.execcmd(props, 'clean', extraAnsibleVars = args.extraAnsibleVars)
        run(cmd, playbook.path(basedir), args.skiprun)

    if args.deploy and playbook is not None:
        cmd = playbook.execcmd(props, extraAnsibleVars = args.extraAnsibleVars)
        run(cmd, playbook.path(basedir), args.skiprun)

if __name__ == '__main__':
    main()