package PVE::API2::Network::SDN::Ipams;

use strict;
use warnings;

use PVE::SafeSyslog;
use PVE::Tools qw(extract_param);
use PVE::Cluster qw(cfs_read_file cfs_write_file);
use PVE::Network::SDN;
use PVE::Network::SDN::Ipams;
use PVE::Network::SDN::Ipams::Plugin;
use PVE::Network::SDN::Ipams::PVEPlugin;
use PVE::Network::SDN::Ipams::PhpIpamPlugin;
use PVE::Network::SDN::Ipams::NetboxPlugin;
use PVE::Network::SDN::Dhcp;
use PVE::Network::SDN::Vnets;
use PVE::Network::SDN::Zones;

use Storable qw(dclone);
use PVE::JSONSchema qw(get_standard_option);
use PVE::RPCEnvironment;

use PVE::RESTHandler;

use base qw(PVE::RESTHandler);

my $sdn_ipams_type_enum = PVE::Network::SDN::Ipams::Plugin->lookup_types();

my $api_sdn_ipams_config = sub {
    my ($cfg, $id) = @_;

    my $scfg = dclone(PVE::Network::SDN::Ipams::sdn_ipams_config($cfg, $id));
    $scfg->{ipam} = $id;
    $scfg->{digest} = $cfg->{digest};

    return $scfg;
};

__PACKAGE__->register_method({
    name => 'index',
    path => '',
    method => 'GET',
    description => "SDN ipams index.",
    permissions => {
        description =>
            "Only list entries where you have 'SDN.Audit' or 'SDN.Allocate' permissions on '/sdn/ipams/<ipam>'",
        user => 'all',
    },
    parameters => {
        additionalProperties => 0,
        properties => {
            type => {
                description => "Only list sdn ipams of specific type",
                type => 'string',
                enum => $sdn_ipams_type_enum,
                optional => 1,
            },
        },
    },
    returns => {
        type => 'array',
        items => {
            type => "object",
            properties => {
                ipam => { type => 'string' },
                type => { type => 'string' },
            },
        },
        links => [{ rel => 'child', href => "{ipam}" }],
    },
    code => sub {
        my ($param) = @_;

        my $rpcenv = PVE::RPCEnvironment::get();
        my $authuser = $rpcenv->get_user();

        my $cfg = PVE::Network::SDN::Ipams::config();

        my @sids = PVE::Network::SDN::Ipams::sdn_ipams_ids($cfg);
        my $res = [];
        foreach my $id (@sids) {
            my $privs = ['SDN.Audit', 'SDN.Allocate'];
            next if !$rpcenv->check_any($authuser, "/sdn/ipams/$id", $privs, 1);

            my $scfg = &$api_sdn_ipams_config($cfg, $id);
            next if $param->{type} && $param->{type} ne $scfg->{type};

            my $plugin_config = $cfg->{ids}->{$id};
            my $plugin = PVE::Network::SDN::Ipams::Plugin->lookup($plugin_config->{type});
            push @$res, $scfg;
        }

        return $res;
    },
});

__PACKAGE__->register_method({
    name => 'read',
    path => '{ipam}',
    method => 'GET',
    description => "Read sdn ipam configuration.",
    permissions => {
        check => ['perm', '/sdn/ipams/{ipam}', ['SDN.Allocate']],
    },

    parameters => {
        additionalProperties => 0,
        properties => {
            ipam => get_standard_option('pve-sdn-ipam-id'),
        },
    },
    returns => { type => 'object' },
    code => sub {
        my ($param) = @_;

        my $cfg = PVE::Network::SDN::Ipams::config();

        return &$api_sdn_ipams_config($cfg, $param->{ipam});
    },
});

__PACKAGE__->register_method({
    name => 'create',
    protected => 1,
    path => '',
    method => 'POST',
    description => "Create a new sdn ipam object.",
    permissions => {
        check => ['perm', '/sdn/ipams', ['SDN.Allocate']],
    },
    parameters => PVE::Network::SDN::Ipams::Plugin->createSchema(
        undef,
        {
            'lock-token' => get_standard_option('pve-sdn-lock-token'),
        },
    ),
    returns => { type => 'null' },
    code => sub {
        my ($param) = @_;

        my $type = extract_param($param, 'type');
        my $id = extract_param($param, 'ipam');
        my $lock_token = extract_param($param, 'lock-token');

        my $plugin = PVE::Network::SDN::Ipams::Plugin->lookup($type);
        my $opts = $plugin->check_config($id, $param, 1, 1);

        # create /etc/pve/sdn directory
        PVE::Cluster::check_cfs_quorum();
        mkdir("/etc/pve/sdn");

        PVE::Network::SDN::lock_sdn_config(
            sub {

                my $ipam_cfg = PVE::Network::SDN::Ipams::config();
                my $controller_cfg = PVE::Network::SDN::Controllers::config();

                my $scfg = undef;
                if ($scfg = PVE::Network::SDN::Ipams::sdn_ipams_config($ipam_cfg, $id, 1)) {
                    die "sdn ipam object ID '$id' already defined\n";
                }

                $ipam_cfg->{ids}->{$id} = $opts;

                my $plugin_config = $opts;
                my $plugin = PVE::Network::SDN::Ipams::Plugin->lookup($plugin_config->{type});
                $plugin->on_update_hook($plugin_config);

                PVE::Network::SDN::Ipams::write_config($ipam_cfg);

            },
            "create sdn ipam object failed",
            $lock_token,
        );

        return undef;
    },
});

__PACKAGE__->register_method({
    name => 'update',
    protected => 1,
    path => '{ipam}',
    method => 'PUT',
    description => "Update sdn ipam object configuration.",
    permissions => {
        check => ['perm', '/sdn/ipams', ['SDN.Allocate']],
    },
    parameters => PVE::Network::SDN::Ipams::Plugin->updateSchema(
        undef,
        {
            'lock-token' => get_standard_option('pve-sdn-lock-token'),
        },
    ),
    returns => { type => 'null' },
    code => sub {
        my ($param) = @_;

        my $id = extract_param($param, 'ipam');
        my $digest = extract_param($param, 'digest');
        my $delete = extract_param($param, 'delete');
        my $lock_token = extract_param($param, 'lock-token');

        PVE::Network::SDN::lock_sdn_config(
            sub {

                my $ipam_cfg = PVE::Network::SDN::Ipams::config();

                PVE::SectionConfig::assert_if_modified($ipam_cfg, $digest);

                my $scfg = PVE::Network::SDN::Ipams::sdn_ipams_config($ipam_cfg, $id);

                my $plugin = PVE::Network::SDN::Ipams::Plugin->lookup($scfg->{type});
                my $opts = $plugin->check_config($id, $param, 0, 1);

                if ($delete) {
                    $delete = [PVE::Tools::split_list($delete)];
                    my $options = $plugin->private()->{options}->{ $scfg->{type} };
                    PVE::SectionConfig::delete_from_config($scfg, $options, $opts, $delete);
                }

                foreach my $k (%$opts) {
                    $scfg->{$k} = $opts->{$k};
                }

                $plugin->on_update_hook($scfg);

                PVE::Network::SDN::Ipams::write_config($ipam_cfg);

            },
            "update sdn ipam object failed",
            $lock_token,
        );

        return undef;
    },
});

__PACKAGE__->register_method({
    name => 'delete',
    protected => 1,
    path => '{ipam}',
    method => 'DELETE',
    description => "Delete sdn ipam object configuration.",
    permissions => {
        check => ['perm', '/sdn/ipams', ['SDN.Allocate']],
    },
    parameters => {
        additionalProperties => 0,
        properties => {
            ipam => get_standard_option(
                'pve-sdn-ipam-id',
                {
                    completion => \&PVE::Network::SDN::Ipams::complete_sdn_ipams,
                },
            ),
            'lock-token' => get_standard_option('pve-sdn-lock-token'),
        },
    },
    returns => { type => 'null' },
    code => sub {
        my ($param) = @_;

        my $id = extract_param($param, 'ipam');
        my $lock_token = extract_param($param, 'lock-token');

        PVE::Network::SDN::lock_sdn_config(
            sub {

                my $cfg = PVE::Network::SDN::Ipams::config();

                my $scfg = PVE::Network::SDN::Ipams::sdn_ipams_config($cfg, $id);

                my $plugin = PVE::Network::SDN::Ipams::Plugin->lookup($scfg->{type});

                my $vnet_cfg = PVE::Network::SDN::Vnets::config();

                delete $cfg->{ids}->{$id};
                PVE::Network::SDN::Ipams::write_config($cfg);

            },
            "delete sdn zone object failed",
            $lock_token,
        );

        return undef;
    },
});

__PACKAGE__->register_method({
    name => 'ipamindex',
    path => '{ipam}/status',
    method => 'GET',
    description => 'List PVE IPAM Entries',
    protected => 1,
    permissions => {
        description =>
            "Only list entries where you have 'SDN.Audit' or 'SDN.Allocate' permissions on '/sdn/zones/<zone>/<vnet>'",
        user => 'all',
    },
    parameters => {
        additionalProperties => 0,
        properties => {
            ipam => get_standard_option(
                'pve-sdn-ipam-id',
                {
                    completion => \&PVE::Network::SDN::Ipams::complete_sdn_ipams,
                },
            ),
        },
    },
    returns => {
        type => 'array',
    },
    code => sub {
        my ($param) = @_;

        my $id = extract_param($param, 'ipam');
        die "Currently only PVE IPAM is supported!" if $id ne 'pve';

        my $rpcenv = PVE::RPCEnvironment::get();
        my $authuser = $rpcenv->get_user();
        my $privs = ['SDN.Audit', 'SDN.Allocate'];

        my $ipam_plugin = PVE::Network::SDN::Ipams::Plugin->lookup('pve');
        my $ipam_db = $ipam_plugin->read_db();

        my $result = [];

        for my $zone_id (keys %{ $ipam_db->{zones} }) {
            my $zone_config = PVE::Network::SDN::Zones::get_zone($zone_id, 1);
            next if !$zone_config || $zone_config->{ipam} ne 'pve' || !$zone_config->{dhcp};

            my $zone = $ipam_db->{zones}->{$zone_id};

            my $vnets = PVE::Network::SDN::Zones::get_vnets($zone_id, 1);

            for my $subnet_cidr (keys %{ $zone->{subnets} }) {
                my $subnet = $zone->{subnets}->{$subnet_cidr};
                my $ip = new NetAddr::IP($subnet_cidr) or die 'Found invalid CIDR in IPAM';

                my $vnet = undef;
                for my $vnet_id (keys %$vnets) {
                    eval {
                        my ($zone, $subnetid, $subnet_cfg, $ip) =
                            PVE::Network::SDN::Vnets::get_subnet_from_vnet_ip(
                                $vnet_id, $ip->addr,
                            );

                        $vnet = $subnet_cfg->{vnet};
                    };

                    last if $vnet;
                }

                next
                    if !$vnet
                    || !$rpcenv->check_any($authuser, "/sdn/zones/$zone_id/$vnet", $privs, 1);

                for my $ip (keys %{ $subnet->{ips} }) {
                    my $entry = $subnet->{ips}->{$ip};
                    $entry->{zone} = $zone_id;
                    $entry->{subnet} = $subnet_cidr;
                    $entry->{ip} = $ip;
                    $entry->{vnet} = $vnet;

                    push @$result, $entry;
                }
            }
        }

        return $result;
    },
});

1;