# Copyright: (c) 2016, Allen Sanabria <asanabria@linuxdynasty.org>
# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)

from __future__ import (absolute_import, division, print_function)
__metaclass__ = type

from os import path, walk
import re

import ansible.constants as C
from ansible.errors import AnsibleError
from ansible.module_utils.six import string_types
from ansible.module_utils.common.text.converters import to_native, to_text
from ansible.plugins.action import ActionBase
from ansible.template import Templar
from ansible.utils.vars import combine_vars
from pathlib import Path


class ActionModule(ActionBase):

    TRANSFERS_FILES = False
    _requires_connection = False

    def run(self, tmp=None, task_vars=None):
        """ Load yml files recursively from a directory.
        """
        del tmp  # tmp no longer has any effect

        if task_vars is None:
            task_vars = dict()
        self.task_var = task_vars
        self.show_content = True
        self.included_files = []

        # Validate arguments
        dirs = 0

        module_args = self._task.args.copy()
        
        if not "dir" in module_args:
            raise AnsibleError('\'dir\' option is mendatory in load_haproxy_config')
        if not "default_domain" in module_args:
            raise AnsibleError('\'default_domain\' option is mendatory in load_haproxy_config')
        if not "default_dns_provider" in module_args:
            raise AnsibleError('\'default_dns_provider\' option is mendatory in load_haproxy_config')
        if not "default_dns_target" in module_args:
            raise AnsibleError('\'default_dns_target\' option is mendatory in load_haproxy_config')

        self.source_dir = module_args.get('dir')
        self.default_domain = module_args.get('default_domain')
        self.default_dns_provider = module_args.get('default_dns_provider')
        self.default_dns_target = module_args.get('default_dns_target')
        self.dir = module_args.get('dir')
        self.depth = module_args.get('depth', 0)

        results = {
            "domain_maping": [],
            "dns_hostnames": dict(), # { provider: [ { hostname:"", domain:"", state: "", target: "" } ] }
            "protected_domain": [],
            "backend_config": []
        }
        failed = False

        self._set_root_dir()
        if not path.exists(self.source_dir):
            failed = True
            err_msg = ('{0} directory does not exist'.format(to_native(self.source_dir)))
        elif not path.isdir(self.source_dir):
            failed = True
            err_msg = ('{0} is not a directory'.format(to_native(self.source_dir)))
        else:
            for root_dir, filenames in self._traverse_dir_depth():
                failed, err_msg, updated_results = (self._load_files_in_dir(root_dir, filenames))
                if failed:
                    break
                results['domain_maping'] = results['domain_maping'] + updated_results['domain_maping']
                results['protected_domain'] = results['protected_domain'] + updated_results['protected_domain']
                results['backend_config'] = results['backend_config'] + updated_results['backend_config']
                print(updated_results)
                for key, value in updated_results['dns_hostnames'].items():
                    results['dns_hostnames'][key] = results['dns_hostnames'].get(key, []) + value 


        result = super(ActionModule, self).run(task_vars=task_vars)

        if failed:
            result['failed'] = failed
            result['message'] = err_msg
        scope = dict()
        scope['haproxy_config'] = results
        results = scope
        result['ansible_included_var_files'] = self.included_files
        result['ansible_facts'] = results
        result['_ansible_no_log'] = not self.show_content

        return result

    def _set_root_dir(self):
        if self._task._role:
            if self.source_dir.split('/')[0] == 'vars':
                path_to_use = (
                    path.join(self._task._role._role_path, self.source_dir)
                )
                if path.exists(path_to_use):
                    self.source_dir = path_to_use
            else:
                path_to_use = (
                    path.join(
                        self._task._role._role_path, 'vars', self.source_dir
                    )
                )
                self.source_dir = path_to_use
        else:
            if hasattr(self._task._ds, '_data_source'):
                current_dir = (
                    "/".join(self._task._ds._data_source.split('/')[:-1])
                )
                self.source_dir = path.join(current_dir, self.source_dir)

    def _log_walk(self, error):
        self._display.vvv('Issue with walking through "%s": %s' % (to_native(error.filename), to_native(error)))

    def _traverse_dir_depth(self):
        """ Recursively iterate over a directory and sort the files in
            alphabetical order. Do not iterate pass the set depth.
            The default depth is unlimited.
        """
        current_depth = 0
        sorted_walk = list(walk(self.source_dir, onerror=self._log_walk, followlinks=True))
        sorted_walk.sort(key=lambda x: x[0])
        for current_root, current_dir, current_files in sorted_walk:
            current_depth += 1
            if current_depth <= self.depth or self.depth == 0:
                current_files.sort()
                yield (current_root, current_files)
            else:
                break

    def _load_files(self, filename):
        """ Loads a file and converts the output into a valid Python dict.
        Args:
            filename (str): The source file.

        Returns:
            Tuple (bool, str, dict)
        """
        results = dict()
        failed = False
        err_msg = ''
        b_data, show_content = self._loader._get_file_contents(filename)
        data = to_text(b_data, errors='surrogate_or_strict')

        self.show_content = show_content
        data = self._loader.load(data, file_name=filename, show_content=show_content)
        if not data:
            data = dict()
        if not isinstance(data, dict):
            failed = True
            err_msg = ('{0} must be stored as a dictionary/hash'.format(to_native(filename)))
        else:
            # Apply Ansible templating to the data
            templar = Templar(loader=self._loader, variables=self.task_var)
            data = templar.template(data)

            self.included_files.append(filename)
            results.update(data)

        return failed, err_msg, results

    def _load_files_in_dir(self, root_dir, var_files):
        """ Load the found yml files and update/overwrite the dictionary.
        Args:
            root_dir (str): The base directory of the list of files that is being passed.
            var_files: (list): List of files to iterate over and load into a dictionary.

        Returns:
            Tuple (bool, str, dict)
        """
        results = {
            "domain_maping": [],
            "dns_hostnames": dict(), # { provider: [ { hostname:"", domain:"", state: "", target: "" } ] }
            "protected_domain": [],
            "backend_config": []
        }
        failed = False
        err_msg = ''
        for filename in var_files:
            stop_iter = False
            # Never include main.yml from a role, as that is the default included by the role
            if self._task._role:
                if path.join(self._task._role._role_path, filename) == path.join(root_dir, 'vars', 'main.yml'):
                    stop_iter = True
                    continue

            filepath = path.join(root_dir, filename)
            if not stop_iter and not failed:
                if path.exists(filepath):
                    failed, err_msg, loaded_data = self._load_files(filepath)
                    if not failed:
                        main_hostname = Path(filepath).stem
                        dns = loaded_data.get("dns", dict())
                        domain = dns.get("domain", self.default_domain)
                        dns_provider = dns.get("provider", self.default_dns_provider)
                        dns_target = dns.get("target", self.default_dns_target)
                        protected = loaded_data.get("protected", False)
                        additionnal_hostname = loaded_data.get('additionnal_hostname', [])
                        state = loaded_data.get("state", "present")
                        if "backend"  not in loaded_data:
                            failed = True
                            err_msg = ('Could not find "backend" in {0}'.format(to_native(filename)))
                            continue
                        backend = loaded_data.get("backend")

                        if state == "present":
                            results['domain_maping'].append('{0}.{1} {2}'.format(main_hostname, domain, backend.get("name")))
                            results['backend_config'].append(backend)
                            if protected:
                                results['protected_domain'].append('{0}.{1}'.format(main_hostname, domain))

                        if not dns.get("skip", False):
                            if not dns_provider in results['dns_hostnames']:
                                results['dns_hostnames'].update({ dns_provider: []})

                            results['dns_hostnames'][dns_provider].append({
                                "hostname": main_hostname,
                                "domain": domain,
                                "target": dns_target,
                                "state": state,
                            })
                        
                        for host in additionnal_hostname: 
                            this_dns = host.get("dns", dns)
                            this_domain = this_dns.get("domain", domain)
                            this_dns_provider = this_dns.get("provider", dns_provider)
                            this_dns_target = this_dns.get("target", dns_target)
                            this_protected = host.get('protected', protected)
                            this_state = host.get('state', state)

                            if this_state == "present":
                                full_domain = '{0}.{1}'.format(host.get("hostname"), this_domain) if host.get("hostname") else this_domain
                                results['domain_maping'].append('{0} {2}'.format(full_domain, this_domain, backend.get("name")))
                                if this_protected:
                                    results['protected_domain'].append(full_domain)

                            if not this_dns.get("skip", dns.get("skip", False)):
                                if not this_dns_provider in results['dns_hostnames']:
                                    results['dns_hostnames'].update({ this_dns_provider: []})

                                results['dns_hostnames'][this_dns_provider].append({
                                    "hostname": host.get("hostname"),
                                    "domain": this_domain,
                                    "target": this_dns_target,
                                    "state": this_state
                                })
        return failed, err_msg, results