import os
import requests

from flask import request, g

import app.modules.db.sql as sql
import app.modules.server.server as server_mod
import app.modules.config.config as config_mod
import app.modules.config.common as config_common
import app.modules.roxywi.common as roxywi_common


def stat_page_action(server_ip: str, group_id: int) -> bytes:
    haproxy_user = sql.get_setting('haproxy_stats_user', group_id=group_id)
    haproxy_pass = sql.get_setting('haproxy_stats_password', group_id=group_id)
    haproxy_pass = haproxy_pass.replace("'", "")
    stats_port = sql.get_setting('haproxy_stats_port', group_id=group_id)
    stats_page = sql.get_setting('haproxy_stats_page', group_id=group_id)

    postdata = {
        'action': request.form.get('action'),
        's': request.form.get('s'),
        'b': request.form.get('b')
    }

    headers = {
        'User-Agent': 'Mozilla/5.0 (Windows NT 5.1; rv:20.0) Gecko/20100101 Firefox/20.0',
        'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
        'Accept-Language': 'en-US,en;q=0.5',
        'Accept-Encoding': 'gzip, deflate'
    }

    data = requests.post(f'http://{server_ip}:{stats_port}/{stats_page}', headers=headers, data=postdata, auth=(haproxy_user, haproxy_pass), timeout=5)
    return data.content


def show_map(serv: str, group_id: int) -> str:
    import networkx as nx
    import matplotlib

    matplotlib.use('Agg')
    import matplotlib.pyplot as plt

    service = 'haproxy'
    stats_port = sql.get_setting(f'{service}_stats_port', group_id=group_id)
    cfg = config_common.generate_config_path(service, serv)
    output = f'<center><h4 style="margin-bottom: 0;">Map from {serv}</h4>'
    error = config_mod.get_config(serv, cfg, service=service)

    if error:
        return f'error: Cannot read import config file {error}'

    try:
        conf = open(cfg, "r")
    except IOError as e:
        return f'error: Cannot read import config file {e}'

    G = nx.DiGraph()
    node = ""
    line_new2 = [1, ""]
    sections = {'listens': dict(), 'backends': dict()}

    for line in conf:
        if line.startswith('listen') or line.startswith('frontend'):
            if "stats" not in line:
                node = line
        if line.find("backend") == 0:
            node = line
            node = node.split('\n')[0]
            sections['backends'][node] = {'servers': dict()}

        if "bind" in line or (line.startswith('listen') and ":" in line) or (
                line.startswith('frontend') and ":" in line):
            try:
                if "@" not in line:
                    bind = line.split(":")
                else:
                    bind = line.split("@")
                if str(stats_port) not in bind[1]:
                    bind[1] = bind[1].strip(' ')
                    bind = bind[1].split("crt")
                    node = node.strip(' \t\n\r')
                    node = node + ":" + bind[0]
                    node = node.split('\n')[0]
                    sections['listens'][node] = {'servers': dict()}
            except Exception:
                pass

        if "server " in line or "use_backend" in line or "default_backend" in line and "stats" not in line and "#" not in line:
            if "timeout" not in line and "default-server" not in line and "#" not in line and "stats" not in line:
                if "check" in line:
                    line_new = line.split("check")
                else:
                    line_new = line.split("if ")
                if "server" in line:
                    line_new1 = line_new[0].split("server")
                    line_new[0] = line_new1[1]
                    line_new2 = line_new[0].split(":")
                    line_new[0] = line_new2[0]

                line_new[0] = line_new[0].strip(' \t\n\r')

                try:
                    backend_server_port = line_new2[1].strip(' \t\n\r')
                    backend_server_port = 'port: ' + backend_server_port
                except Exception:
                    backend_server_port = ''

                try:
                    sections['listens'][node]['servers'][line_new[0]] = {line_new[0]: backend_server_port}
                except Exception:
                    pass

                try:
                    sections['backends'][node]['servers'][line_new[0]] = {line_new[0]: backend_server_port}
                except Exception:
                    pass
    conf.close()
    os.remove(cfg)

    i, k, j = 0, 0, 0
    backend_servers_len_dict = 1
    backends_from_frontends = []
    backends_servers = []

    for key, val in sections.items():
        if key == 'listens':
            for k2, v2 in val.items():
                i -= 750
                G.add_node(k2, pos=(k, i), label_pos=(k, i + 250))

                for _k3, v3 in v2.items():
                    for k4, v4 in v3.items():
                        """ Add backend servers of listens or backend from frontends """
                        i -= 300
                        j += 1
                        server_name = k4

                        if 'default_backend' in k4 or 'use_backend' in k4:
                            backend_name = k4.split(' ')[1]
                            backend_name = 'backend ' + backend_name
                            k4 = backend_name
                            backends_from_frontends.append(k4)

                        if k4 not in backends_servers:
                            if j % 2 == 0:
                                G.add_node(k4, pos=(k + 250, i - 100), label_pos=(k + 250, i - 420))
                            else:
                                G.add_node(k4, pos=(k - 250, i - 370), label_pos=(k - 245, i - 650))

                        if v4[server_name] != '':
                            G.add_edge(k2, k4, port=v4[server_name])
                        else:
                            G.add_edge(k2, k4, port='')

                    for k4, _v4 in v3.items():
                        """ Add servers from backends  """
                        i -= 300
                        j -= 1

                        if 'default_backend' in k4 or 'use_backend' in k4:
                            backend_name = k4.split(' ')[1]
                            backend_name = 'backend ' + backend_name
                            k4 = backend_name
                            backends_from_frontends.append(k4)

                            if j % 2 == 0:
                                if len(v3) % 2 == 0:
                                    i += (700 * backend_servers_len_dict) + 700
                                for k5, v5 in sections['backends'][k4]['servers'].items():
                                    i -= 700
                                    s = k + 400
                                    G.add_node(k5, pos=(s + 250, i - 335), label_pos=(s + 215, i - 580))

                                    if v5[k5] != '':
                                        G.add_edge(k4, k5, port=v5[k5])
                                    else:
                                        G.add_edge(k4, k5, port='')

                                    backends_servers.append(k5)
                            else:
                                for k5, v5 in sections['backends'][k4]['servers'].items():
                                    i -= 700
                                    s = k - 400
                                    G.add_node(k5, pos=(s - 250, i - 0), label_pos=(s - 245, i - 270))

                                    if v5[k5] != '':
                                        G.add_edge(k4, k5, port=v5[k5])
                                    else:
                                        G.add_edge(k4, k5, port='')

                                    backends_servers.append(k5)
                                backend_servers_len_dict = len(sections['backends'][k4]['servers'])

                        backends_servers.append(k4)

        elif key == 'backends':
            for k2, v2 in val.items():

                if k2 not in backends_from_frontends:
                    i -= 750
                    G.add_node(k2, pos=(k, i), label_pos=(k, i + 250))

                for _k3, v3 in v2.items():
                    for k4, v4 in v3.items():

                        if k4 not in backends_servers:
                            i -= 300
                            j += 1

                            if j % 2 == 0:
                                s = k + 400
                                G.add_node(k4, pos=(s + 250, i - 335), label_pos=(s + 215, i - 580))
                            else:
                                s = k - 400
                                G.add_node(k4, pos=(s - 250, i - 0), label_pos=(s - 245, i - 270))

                        if v4[k4] != '':
                            G.add_edge(k2, k4, port=v4[k4])
                        else:
                            G.add_edge(k2, k4, port='')

                        backends_servers.append(k4)

    pos = nx.get_node_attributes(G, 'pos')
    pos_label = nx.get_node_attributes(G, 'label_pos')
    edge_labels = nx.get_edge_attributes(G, 'port')

    try:
        plt.figure(10, figsize=(10, 20))
        nx.draw(G, pos, with_labels=False, font_weight='bold', width=3, alpha=0.1, linewidths=5)
        nx.draw_networkx_nodes(G, pos, node_color="#5d9ceb", node_size=100, alpha=0.8, node_shape="h")
        nx.draw_networkx_labels(G, pos=pos_label, alpha=1, font_color="#5CB85C", font_size=10)
        nx.draw_networkx_edges(G, pos, width=0.3, alpha=0.7, edge_color="#5D9CEB", arrows=False)
        nx.draw_networkx_edge_labels(G, pos, alpha=0.4, label_pos=0.5, font_color="#5d9ceb", edge_labels=edge_labels,
                                     font_size=8)

        plt.savefig("/var/www/haproxy-wi/app/static/map.png")
        plt.show()
    except Exception as e:
        return f'error: Cannot create a map: {e}'

    output += '<img src="/static/map.png" alt="map"></center>'
    return output


def runtime_command(serv: str, enable: str, backend: str, save: str) -> str:
    server_state_file = sql.get_setting('server_state_file', group_id=g.user_params['group_id'])
    haproxy_sock = sql.get_setting('haproxy_sock', group_id=g.user_params['group_id'])
    cmd = f"echo {enable} {backend} |sudo socat stdio {haproxy_sock}"

    if save == "on":
        save_command = f'echo "show servers state" | sudo socat {haproxy_sock} stdio > {server_state_file}'
        cmd = cmd + ';' + save_command

    try:
        output = server_mod.ssh_command(serv, cmd, show_log="1")
    except Exception as e:
        return f'{e}'
    else:
        if enable != "show":
            roxywi_common.logging(serv, f'Has been {enable}ed {backend}', login=1, keep_history=1, service='haproxy')
            return f'<center><h3>You {enable} {backend} on HAProxy {serv}.</center> {output}'
        else:
            return output