import os, sys, subprocess, platform, fileinput, json, argparse, shutil

DEBUG = False

'''
    Pyros installation file (able to handle project configuration commands)
'''


class Utils:
    system = platform.system()
    columns = 100
    row = 1000

    def __init__(self):
        if (platform.system() != 'Windows'):
            try:
                rows, columns = os.popen('stty size', 'r').read().split()
                self.columns = int(columns)
            except:
                self.columns = 100
                if DEBUG:
                    print("Could not get terminal size")

    def printFullTerm(self, color, string):
        value = int(self.columns / 2 - len(string) / 2)
        self.printColor(color, "-" * value, eol='')
        self.printColor(color, string, eol='')
        value += len(string)
        self.printColor(color, "-" * (self.columns - value))
        return 0

    def changeDirectory(self, path):
        if DEBUG:
            print("Moving to : " + path)
        os.chdir(path)
        if DEBUG:
            print("Current directory : " + str(os.getcwd()))
        return 0

    def replacePatternInFile(self, pattern, replace, file_path):
        try:
            with fileinput.FileInput(file_path, inplace=True, backup='.bak') as file:
                for line in file:
                    print(line.replace(pattern, replace), end='')
        except:
            return 1
        return 0

    def printColor(self, color, message, file=sys.stdout, eol=os.linesep):
        if (self.system == 'Windows'):
            print(message, file=file, end=eol)
        else:
            print(color + message + Colors.ENDC, file=file, end=eol)
        return 0


'''
    Python installer class
'''


class AInstaller(Utils):
    path = os.path.realpath(__file__)
    path_dir = os.getcwd()
    python_path = sys.executable
    python_version = sys.version_info

    commands = []
    commandMatcher = {}
    bin_dir = ""
    venv_pip = ""
    venv_bin = ""
    venv = ""
    venv_dir = ""
    requirements = ""

    current_command = "default"
    private = {}
    commands_list = []
    to_print = []
    executed = {}
    errors = {}
    defined_variables = {}

    def __init__(self, config):
        super(AInstaller, self).__init__()
        self.private = {
            "requirements": self.requirement,
            "create": self.create,
        }
        self.config = config
        self.commands = self.config.getCommandList()
        self.venv = self.config.getPath() + os.sep + self.config.getEnv()
        self.requirements = self.config.getReq()
        self.adaptInstaller()
        os.chdir(self.path_dir)

    def adaptInstaller(self):
        self.commandMatcher = self.config.getCommands()
        config = self.config.getConfig()
        if self.system == 'Windows':
            self.bin_dir = "Scripts"
            self.bin_name = "python.exe"
            self.pip_name = "pip.exe"
        else:
            self.bin_dir = "bin"
            self.bin_name = "python"
            self.pip_name = "pip"
        self.venv_pip = config["path"] + os.sep + config["env"] + os.sep + self.bin_dir + os.sep + self.pip_name
        self.venv_bin = config["path"] + os.sep + config["env"] + os.sep + self.bin_dir + os.sep + self.bin_name
        self.site_packages = config["path"] + os.sep + config["env"] + os.sep + "Lib" + os.sep + "site-packages" + os.sep


    '''
        Special functions
    '''
    def requirement(self):
        if (os.path.isfile(self.requirements)):
            if self.execProcessFromVenv(self.venv_pip + " install -r " + self.requirements):
                return 1
        else:
            self.printFullTerm(Colors.FAIL, "Requirements file " + self.requirements + " not found.")
        return 0

    def create(self):
        if (not os.path.isdir(self.venv)):
            if self.execProcess("virtualenv " + self.venv + " -p " + self.python_path):
                return 1
        else:
            self.printFullTerm(Colors.FAIL, "Virtual environment already exist")
        return 0

    '''
        Functions parameters
    '''
    def createConfig(self):
        configuration = self.config.createConfigFile()
        try:
            with open(self.config.getConfigFile(), "w") as f:
                f.write(json.dumps(configuration, sort_keys=True, indent=4))
        except Exception as e:
            print(e, file=sys.stderr)
            self.errors[self.current_command] = []
            return 1
        self.executed[self.current_command] = []
        return 0

    '''
        UTILS FUNCTIONS
    '''
    def setConfig(self, config):
        self.config = config

    def addExecuted(self, src, message):
        if (src in self.executed):
            self.executed[src].append(str(message))
        else:
            self.executed[src] = [str(message)]
        return 0

    def addError(self, src, message):
        if (src in self.errors):
            self.errors[src].append(str(message))
        else:
            self.errors[src] = [str(message)]
        return 0

    def execProcess(self, command):
        self.printFullTerm(Colors.BLUE, "Executing command [" + command + "]")
        process = subprocess.Popen(command, shell=True)
        process.wait()
        if process.returncode == 0:
            self.printFullTerm(Colors.GREEN, "Process executed successfully")
            self.addExecuted(self.current_command, command)
        else:
            self.printFullTerm(Colors.WARNING, "Process execution failed")
            self.addError(self.current_command, command)
        return process.returncode

    def execProcessFromVenv(self, command):
        args = command.split()
        self.printFullTerm(Colors.BLUE, "Executing command from venv [" + str(' '.join(args[1:])) + "]")
        process = subprocess.Popen(args)
        process.wait()
        if process.returncode == 0:
            self.printFullTerm(Colors.GREEN, "Process executed successfully")
            self.addExecuted(self.current_command, str(' '.join(args[1:])))
        else:
            self.printFullTerm(Colors.WARNING, "Process execution failed")
            self.addError(self.current_command, str(' '.join(args[1:])))
        return process.returncode

    def askYesNoQuestion(self,  message, question_tag, default=True):
        print(os.linesep * 2)
        self.printColor(Colors.BLUE, message + ": ", eol='')
        self.printColor(Colors.WARNING, "(default: " + ("Yes" if default else "No") + ") (Y/N)")
        self.printColor(Colors.BOLD, "Answer : ", eol='')
        sys.stdout.flush()
        answer = sys.stdin.readline().replace('\n', '').replace('\r', '')
        if answer == "Y" or answer == "y":
            self.defined_variables[question_tag] = True
            return True
        if (answer == ""):
            self.defined_variables[question_tag] = default
            return default
        self.defined_variables[question_tag] = False
        return False

    def askQuestion(self, message, default = ""):
        self.printColor(Colors.BLUE, message)
        self.printColor(Colors.BOLD, "Answer (default="+default+"): ", eol='')
        sys.stdout.flush()
        ret = sys.stdin.readline().replace('\n', '').replace('\r', '')
        if ret == "":
            return default
        return ret

    def addToPrint(self, message):
        self.to_print.append(message)
        return 0



    '''
        CORE
    '''
    def feed(self, array):
        self.commands_list = self.commands_list + array
        return 0

    def parse(self):
        try:
            for command in self.commands_list:
                if not isinstance(command, str):
                    raise Exception("Invalid parameter + " + str(command))
                self.commands.append(command)
        except Exception as e:
            self.logError("An exception has been raised : " + str(e))
            return 1
        return 0

    def end(self):
        count = 0

        self.printFullTerm(Colors.WARNING, "Summary")
        self.printColor(Colors.GREEN, "Success : ")
        for command, valid in self.executed.items():
            if not valid:
                self.printColor(Colors.BLUE, "\t- Command : " + command + " successfully executed !")
            else:
                self.printColor(Colors.WARNING, "\t- In commmand : " + command)
                for exe in valid:
                    self.printColor(Colors.GREEN, "\t\t - Command : " + exe + " successfully executed ! ")
        self.printColor(Colors.FAIL, "Errors : ")
        if not self.errors:
            self.printColor(Colors.GREEN, "\tNone")
        for command, items in self.errors.items():
            count += 1
            if (not items):
                self.printColor(Colors.FAIL, "Command : " + command + " failed !")
            else:
                self.printColor(Colors.WARNING, "\t- In commmand : " + command)
                for exe in items:
                    self.printColor(Colors.FAIL, "\t\t - Command : " + exe + " failed.")
        if not self.errors:
            self.printFullTerm(Colors.BOLD, "Messages")
            for message in self.to_print:
                self.printColor(Colors.BOLD, message)
        return count

    def execCommand(self, command, matcher):
        if "normal" in matcher[command]:
            for c in matcher[command]["normal"]:
                if self.execProcess(c):
                    return 1
        if "env_pip" in matcher[command]:
            for c in matcher[command]["env_pip"]:
                if c != "" and c:
                    if self.execProcessFromVenv(self.venv_pip + " " + c):
                        return 1
        if "env_bin" in matcher[command]:
            for c in matcher[command]["env_bin"]:
                if c != "" and c:
                    if self.execProcessFromVenv(self.venv_bin + " " + c):
                        return 1
        if "private" in matcher[command]:
            for c in matcher[command]["private"]:
                if c in self.private:
                    if self.private[c]():
                        return 1
        if "link" in matcher[command]:
            for link in matcher[command]["link"]:
                if (link in matcher and link != self.current_command):
                    temp = self.current_command
                    self.current_command = link
                    if self.execCommand(link, matcher):
                        return 1
                    self.current_command = temp
        return 0

    def exec(self):
        if (not self.commands):
            return 0
        for command in self.commands:
            self.current_command = command
            if command == "init":
                self.createConfig()
            elif command in self.commandMatcher:
                if self.execCommand(command, self.commandMatcher):
                    break
            else:
                self.logError("Invalid command : " + str(command))
                self.errors[command] = []
        return self.end()

    def logError(self, message):
        self.printColor(Colors.FAIL, "Installer : An error occurred [" + message + "]", file=sys.stderr)
        return 0

'''
    Config Class
'''


class Config:
    __parser = argparse.ArgumentParser("Installer parser")
    __config_file = "install.json"
    __content = {
        "requirements": "REQUIREMENTS.txt",
        "path": "",
        "name": "default",
        "env": "venv"
    }
    __commands = {"install": {
        "env_bin": [],
        "env_pip": [],
        "normal": [
        ],
        "special": ["create"],
        "link": ["update"]
    }, "update": {
        "env_bin": [],
        "env_pip": [
            "install --upgrade pip",
            "install --upgrade wheel",
            ""
        ],
        "normal": [],
        "special": ["requirements"]
    }}
    usage = ""
    __command_list = []

    def __init__(self):
        self.__parser.add_argument("command", help="The command you want to execute")
        self.__parser.add_argument("--conf", help="Configuration file (.json)")
        self.__parser.add_argument("--path", help="Path where the virtual env will be created")
        self.__parser.add_argument("--name", help="Your configuration name")
        self.__parser.add_argument("--env", help="Your environment directory name")
        self.__parser.add_argument("--req", help="Your requirements file")
        self.usage = self.__parser.format_usage()

    def loadConfig(self):
        if not os.path.isfile(self.__config_file):
                return 0
        try:
            with open(self.__config_file) as data_file:
                data = json.load(data_file)
                for key, content in data.items():
                    if key == "Configuration":
                        for k, v in content.items():
                            self.__content[k] = v
                    else:
                        self.__commands[key] = {}
                        for k, v in content.items():
                            self.__commands[key][k] = v
                if (DEBUG):
                    print(json.dumps(self.__content, sort_keys=True, indent=4))
                    print(json.dumps(self.__commands, sort_keys=True, indent=4))
                return 0
        except Exception as e:
            print(e, file=sys.stderr)
            return 1

    def createConfigFile(self):
        configuration = {}
        configuration["Configuration"] = self.__content
        configuration["install"] = self.__commands["install"]
        configuration["update"] = self.__commands["update"]
        return configuration

    def parse(self):
        try:
            res = self.__parser.parse_args(), self.__parser.format_usage()
            return (res)
        except SystemExit as e:
            # print(e, file=sys.stderr)
            sys.exit(1)

    def parseConf(self):
        res, usage = self.parse()
        try:
            if (res.conf):
                self.__config_file = res.conf
            if self.loadConfig():
                return 1
            if (res.path):
                self.__content["path"] = res.path
            if (res.req):
                self.__content["requirements"] = res.req
            if (res.name):
                self.__content["name"] = res.name
            if (res.env):
                self.__content["env"] = res.env
            self.__command_list.append(res.command)
            if self.__content["path"] == "":
                self.__content["path"] = "."
            return 0
        except Exception as e:
            print(e, file=sys.stderr)
            return 1

    def getReq(self):
        return self.__content["requirements"]

    def getPath(self):
        return self.__content["path"]

    def getEnv(self):
        return self.__content["env"]

    def getCommandList(self):
        return self.__command_list

    def getConfigFile(self):
        return self.__config_file

    def getCommands(self):
        return self.__commands

    def printUsage(self):
        print(self.usage, file=sys.stderr)

    def addConf(self, key, value):
        if isinstance(key, str) and isinstance(value, str):
            self.__content[key] = value
            return 0
        return 1

    def setConfigFile(self, conf_file):
        if os.path.isfile(conf_file):
            self.__config_file = conf_file
            return 0
        return 1

    def setPath(self, path):
        if (os.path.isdir(path)):
            if (path == ""):
                path = "."
            self.__content["path"] = path
            return 0
        return 1

    def setEnvName(self, name):
        self.__content["env"] = name
        return 0

    def setRequirements(self, req):
        if (os.path.isfile(req)):
            self.__content["requirements"] = req
            return 0
        return 1

    def setConfName(self, name):
        self.__content["name"] = name
        return 0

    def getConfig(self):
        return self.__content

class Installer(AInstaller):
    sql = "CREATE DATABASE IF NOT EXISTS pyros; CREATE DATABASE IF NOT EXISTS pyros_test; CREATE USER IF NOT EXISTS pyros; GRANT USAGE ON *.* TO 'pyros'; DROP USER 'pyros'; GRANT ALL ON pyros.* TO 'pyros'@'localhost' IDENTIFIED BY 'DjangoPyros'; GRANT ALL ON test_pyros.* TO 'pyros'@'localhost'; GRANT ALL PRIVILEGES ON pyros_test.* TO 'pyros'@'localhost' WITH GRANT OPTION;"
    db_user = "pyros"
    db_password = "DjangoPyros"

    def __init__(self, config):
        super(Installer, self).__init__(config)
        # ADD YOUR PRIVATE FUNCTIONS HERE
        self.private["pyros"] = self.pyros
        if self.system == "Windows":
            self.requirements = "REQUIREMENTS_WINDOWS.txt"
        self.addToPrint("Please run 'python pyrosrun.py server' then go to localhost:8000/admin and log in with these id")
        self.addToPrint("Username : " + self.db_user + " / Password : " + self.db_password)

    '''
        DEFINE YOUR PRIVATE FUNCTIONS HERE
    '''
    def pyros(self):
        if (self.current_command == "install"):
            if (self.system == 'Windows'):
                try:
                    if (not os.path.isdir(self.site_packages + "voevent_parse-0.9.5.dist-info") and
                        not os.path.isdir(self.site_packages + "voeventparse")):
                        self.printFullTerm(Colors.BLUE, "Copying the voevent library in Lib/site-packages")
                        shutil.copytree("windows" + os.sep + "voevent_parse-0.9.5.dist-info", self.site_packages + "voevent_parse-0.9.5.dist-info")
                        shutil.copytree("windows" + os.sep + "voeventparse", self.site_packages + "voeventparse")
                except Exception as e:
                    self.printFullTerm(Colors.FAIL, "Execution failed")
                    self.addError(self.current_command, "Could not copy the voevent libs")
                    return 1
                if self.execProcessFromVenv(self.venv_pip + " install windows\\lxml-3.6.0-cp35-cp35m-win32.whl"):
                    return 1
            if ("database" not in self.defined_variables):
                self.askYesNoQuestion("Do you wish to use mysql in your project ? only if mysql is installed", question_tag="database", default=False)
            if (self.defined_variables["database"]):
                username = self.askQuestion("MYSQL Username", default="root")
                if (self.system == "Windows"):
                    if (self.execProcess("echo " + self.sql + "|mysql -u "+ username + " -p") or
                        self.replacePatternInFile("MYSQL = False", "MYSQL = True", "../src/pyros/settings.py")):
                        return 1
                else:
                    if (self.execProcess("echo \""+self.sql+"\" |mysql -u "+username+" -p") or
                        self.replacePatternInFile("MYSQL = False", "MYSQL = True", "../src/pyros/settings.py")):
                        return 1
        elif (self.current_command == "update"):
            if ("database" not in self.defined_variables):
                self.askYesNoQuestion("Do you wish to use mysql in your project ? only if mysql is installed",
                                      question_tag="database", default=False)
            if (self.defined_variables["database"]):
                if (self.system == 'Windows'):
                    if self.execProcessFromVenv(self.venv_pip + " install windows\\mysqlclient-1.3.7-cp35-cp35m-win32.whl"):
                        return 1
                else:
                    if (self.execProcessFromVenv(self.venv_pip + " install mysqlclient==1.3.7")):
                        return 1
            self.execProcessFromVenv(self.venv_bin + " ../pyros.py init_database")
        return 0


'''
    Color class
'''


class Colors:
    HEADER = '\033[95m'
    BLUE = '\033[94m'
    GREEN = '\033[92m'
    WARNING = '\033[93m'
    FAIL = '\033[91m'
    ENDC = '\033[0m'
    BOLD = '\033[1m'
    UNDERLINE = '\033[4m'

if __name__ == "__main__":
    conf = Config()
    if conf.parseConf():
        sys.exit(1)
    installer = Installer(conf)
    sys.exit(installer.exec())