package PVE::API2::Ceph::Pools;

use strict;
use warnings;

use PVE::Ceph::Tools;
use PVE::Ceph::Services;
use PVE::JSONSchema qw(get_standard_option parse_property_string);
use PVE::RADOS;
use PVE::RESTHandler;
use PVE::RPCEnvironment;
use PVE::Storage;
use PVE::Tools qw(extract_param);

use PVE::API2::Storage::Config;

use base qw(PVE::RESTHandler);

my $get_autoscale_status = sub {
    my ($rados) = shift;

    $rados = PVE::RADOS->new() if !defined($rados);

    my $autoscale = $rados->mon_command({
	    prefix => 'osd pool autoscale-status'});

    my $data;
    foreach my $p (@$autoscale) {
	$data->{$p->{pool_name}} = $p;
    }

    return $data;
};


__PACKAGE__->register_method ({
    name => 'lspools',
    path => '',
    method => 'GET',
    description => "List all pools.",
    proxyto => 'node',
    protected => 1,
    permissions => {
	check => ['perm', '/', [ 'Sys.Audit', 'Datastore.Audit' ], any => 1],
    },
    parameters => {
	additionalProperties => 0,
	properties => {
	    node => get_standard_option('pve-node'),
	},
    },
    returns => {
	type => 'array',
	items => {
	    type => "object",
	    properties => {
		pool => {
		    type => 'integer',
		    title => 'ID',
		},
		pool_name => {
		    type => 'string',
		    title => 'Name',
		},
		size => {
		    type => 'integer',
		    title => 'Size',
		},
		type => {
		    type => 'string',
		    title => 'Type',
		    enum => ['replicated', 'erasure', 'unknown'],
		},
		min_size => {
		    type => 'integer',
		    title => 'Min Size',
		},
		pg_num => {
		    type => 'integer',
		    title => 'PG Num',
		},
		pg_num_min => {
		    type => 'integer',
		    title => 'min. PG Num',
		    optional => 1,
		},
		pg_num_final => {
		    type => 'integer',
		    title => 'Optimal PG Num',
		    optional => 1,
		},
		pg_autoscale_mode => {
		    type => 'string',
		    title => 'PG Autoscale Mode',
		    optional => 1,
		},
		crush_rule => {
		    type => 'integer',
		    title => 'Crush Rule',
		},
		crush_rule_name => {
		    type => 'string',
		    title => 'Crush Rule Name',
		},
		percent_used => {
		    type => 'number',
		    title => '%-Used',
		},
		bytes_used => {
		    type => 'integer',
		    title => 'Used',
		},
		target_size => {
		    type => 'integer',
		    title => 'PG Autoscale Target Size',
		    optional => 1,
		},
		target_size_ratio => {
		    type => 'number',
		    title => 'PG Autoscale Target Ratio',
		    optional => 1,
		},
		autoscale_status => {
		    type => 'object',
		    title => 'Autoscale Status',
		    optional => 1,
		},
	    },
	},
	links => [ { rel => 'child', href => "{pool_name}" } ],
    },
    code => sub {
	my ($param) = @_;

	PVE::Ceph::Tools::check_ceph_inited();

	my $rados = PVE::RADOS->new();

	my $stats = {};
	my $res = $rados->mon_command({ prefix => 'df' });

	foreach my $d (@{$res->{pools}}) {
	    next if !$d->{stats};
	    next if !defined($d->{id});
	    $stats->{$d->{id}} = $d->{stats};
	}

	$res = $rados->mon_command({ prefix => 'osd dump' });
	my $rulestmp = $rados->mon_command({ prefix => 'osd crush rule dump'});

	my $rules = {};
	for my $rule (@$rulestmp) {
	    $rules->{$rule->{rule_id}} = $rule->{rule_name};
	}

	my $data = [];
	my $attr_list = [
	    'pool',
	    'pool_name',
	    'size',
	    'min_size',
	    'pg_num',
	    'crush_rule',
	    'pg_autoscale_mode',
	];

	# pg_autoscaler module is not enabled in Nautilus
	my $autoscale = eval { $get_autoscale_status->($rados) };

	foreach my $e (@{$res->{pools}}) {
	    my $d = {};
	    foreach my $attr (@$attr_list) {
		$d->{$attr} = $e->{$attr} if defined($e->{$attr});
	    }

	    if ($autoscale) {
		$d->{autoscale_status} = $autoscale->{$d->{pool_name}};
		$d->{pg_num_final} = $d->{autoscale_status}->{pg_num_final};
		# some info is nested under options instead
		$d->{pg_num_min} = $e->{options}->{pg_num_min};
		$d->{target_size} = $e->{options}->{target_size_bytes};
		$d->{target_size_ratio} = $e->{options}->{target_size_ratio};
	    }

	    if (defined($d->{crush_rule}) && defined($rules->{$d->{crush_rule}})) {
		$d->{crush_rule_name} = $rules->{$d->{crush_rule}};
	    }

	    if (my $s = $stats->{$d->{pool}}) {
		$d->{bytes_used} = $s->{bytes_used};
		$d->{percent_used} = $s->{percent_used};
	    }

	    # Cephs numerical pool types are barely documented. Found the following in the Ceph
	    # codebase: https://github.com/ceph/ceph/blob/ff144995a849407c258bcb763daa3e03cfce5059/src/osd/osd_types.h#L1221-L1233
	    if ($e->{type} == 1) {
		$d->{type} = 'replicated';
	    } elsif ($e->{type} == 3) {
		$d->{type} = 'erasure';
	    } else {
		# we should never get here, but better be safe
		$d->{type} = 'unknown';
	    }
	    push @$data, $d;
	}


	return $data;
    }});


my $ceph_pool_common_options = sub {
    my ($nodefault) = shift;
    my $options = {
	name => {
	    title => 'Name',
	    description => "The name of the pool. It must be unique.",
	    type => 'string',
	},
	size => {
	    title => 'Size',
	    description => 'Number of replicas per object',
	    type => 'integer',
	    default => 3,
	    optional => 1,
	    minimum => 1,
	    maximum => 7,
	},
	min_size => {
	    title => 'Min Size',
	    description => 'Minimum number of replicas per object',
	    type => 'integer',
	    default => 2,
	    optional => 1,
	    minimum => 1,
	    maximum => 7,
	},
	pg_num => {
	    title => 'PG Num',
	    description => "Number of placement groups.",
	    type => 'integer',
	    default => 128,
	    optional => 1,
	    minimum => 1,
	    maximum => 32768,
	},
	pg_num_min => {
	    title => 'min. PG Num',
	    description => "Minimal number of placement groups.",
	    type => 'integer',
	    optional => 1,
	    maximum => 32768,
	},
	crush_rule => {
	    title => 'Crush Rule Name',
	    description => "The rule to use for mapping object placement in the cluster.",
	    type => 'string',
	    optional => 1,
	},
	application => {
	    title => 'Application',
	    description => "The application of the pool.",
	    default => 'rbd',
	    type => 'string',
	    enum => ['rbd', 'cephfs', 'rgw'],
	    optional => 1,
	},
	pg_autoscale_mode => {
	    title => 'PG Autoscale Mode',
	    description => "The automatic PG scaling mode of the pool.",
	    type => 'string',
	    enum => ['on', 'off', 'warn'],
	    default => 'warn',
	    optional => 1,
	},
	target_size => {
	    description => "The estimated target size of the pool for the PG autoscaler.",
	    title => 'PG Autoscale Target Size',
	    type => 'string',
	    pattern => '^(\d+(\.\d+)?)([KMGT])?$',
	    optional => 1,
	},
	target_size_ratio => {
	    description => "The estimated target ratio of the pool for the PG autoscaler.",
	    title => 'PG Autoscale Target Ratio',
	    type => 'number',
	    optional => 1,
	},
    };

    if ($nodefault) {
	delete $options->{$_}->{default} for keys %$options;
    }
    return $options;
};


my $add_storage = sub {
    my ($pool, $storeid, $ec_data_pool) = @_;

    my $storage_params = {
	type => 'rbd',
	pool => $pool,
	storage => $storeid,
	krbd => 0,
	content => 'rootdir,images',
    };

    $storage_params->{'data-pool'} = $ec_data_pool if $ec_data_pool;

    PVE::API2::Storage::Config->create($storage_params);
};

my $get_storages = sub {
    my ($pool) = @_;

    my $cfg = PVE::Storage::config();

    my $storages = $cfg->{ids};
    my $res = {};
    foreach my $storeid (keys %$storages) {
	my $curr = $storages->{$storeid};
	next if $curr->{type} ne 'rbd';
	$curr->{pool} = 'rbd' if !defined $curr->{pool}; # set default
	if (
	    $pool eq $curr->{pool} ||
	    (defined $curr->{'data-pool'} && $pool eq $curr->{'data-pool'})
	) {
	    $res->{$storeid} = $storages->{$storeid};
	}
    }

    return $res;
};

my $ec_format = {
    k => {
	type => 'integer',
	description => "Number of data chunks. Will create an erasure coded pool plus a"
	    ." replicated pool for metadata.",
	minimum => 2,
    },
    m => {
	type => 'integer',
	description => "Number of coding chunks. Will create an erasure coded pool plus a"
	    ." replicated pool for metadata.",
	minimum => 1,
    },
    'failure-domain' => {
	type => 'string',
	description => "CRUSH failure domain. Default is 'host'. Will create an erasure"
	    ." coded pool plus a replicated pool for metadata.",
	format_description => 'domain',
	optional => 1,
	default => 'host',
    },
    'device-class' => {
	type => 'string',
	description => "CRUSH device class. Will create an erasure coded pool plus a"
	    ." replicated pool for metadata.",
	format_description => 'class',
	optional => 1,
    },
    profile => {
	description => "Override the erasure code (EC) profile to use. Will create an"
	    ." erasure coded pool plus a replicated pool for metadata.",
	type => 'string',
	format_description => 'profile',
	optional => 1,
    },
};

sub ec_parse_and_check {
    my ($property, $rados) = @_;
    return if !$property;

    my $ec = parse_property_string($ec_format, $property);

    die "Erasure code profile '$ec->{profile}' does not exist.\n"
	if $ec->{profile} && !PVE::Ceph::Tools::ecprofile_exists($ec->{profile}, $rados);

    return $ec;
}


__PACKAGE__->register_method ({
    name => 'createpool',
    path => '',
    method => 'POST',
    description => "Create Ceph pool",
    proxyto => 'node',
    protected => 1,
    permissions => {
	check => ['perm', '/', [ 'Sys.Modify' ]],
    },
    parameters => {
	additionalProperties => 0,
	properties => {
	    node => get_standard_option('pve-node'),
	    add_storages => {
		description => "Configure VM and CT storage using the new pool.",
		type => 'boolean',
		optional => 1,
		default => "0; for erasure coded pools: 1",
	    },
	    'erasure-coding' => {
		description => "Create an erasure coded pool for RBD with an accompaning"
		    ." replicated pool for metadata storage. With EC, the common ceph options 'size',"
		    ." 'min_size' and 'crush_rule' parameters will be applied to the metadata pool.",
		type => 'string',
		format => $ec_format,
		optional => 1,
	    },
	    %{ $ceph_pool_common_options->() },
	},
    },
    returns => { type => 'string' },
    code => sub {
	my ($param) = @_;

	PVE::Cluster::check_cfs_quorum();
	PVE::Ceph::Tools::check_ceph_configured();

	my $pool = my $name = extract_param($param, 'name');
	my $node = extract_param($param, 'node');
	my $add_storages = extract_param($param, 'add_storages');

	my $rpcenv = PVE::RPCEnvironment::get();
	my $user = $rpcenv->get_user();
	# Ceph uses target_size_bytes
	if (defined($param->{'target_size'})) {
	    my $target_sizestr = extract_param($param, 'target_size');
	    $param->{target_size_bytes} = PVE::JSONSchema::parse_size($target_sizestr);
	}

	my $rados = PVE::RADOS->new();
	my $ec = ec_parse_and_check(extract_param($param, 'erasure-coding'), $rados);
	$add_storages = 1 if $ec && !defined($add_storages);

	if ($add_storages) {
	    $rpcenv->check($user, '/storage', ['Datastore.Allocate']);
	    die "pool name contains characters which are illegal for storage naming\n"
		if !PVE::JSONSchema::parse_storage_id($pool);
	}

	# pool defaults
	$param->{pg_num} //= 128;
	$param->{size} //= 3;
	$param->{min_size} //= 2;
	$param->{application} //= 'rbd';
	$param->{pg_autoscale_mode} //= 'warn';

	my $worker = sub {
	    # reopen with longer timeout
	    $rados = PVE::RADOS->new(timeout => PVE::Ceph::Tools::get_config('long_rados_timeout'));

	    if ($ec) {
		if (!$ec->{profile}) {
		    $ec->{profile} = PVE::Ceph::Tools::get_ecprofile_name($pool, $rados);
		    eval {
			PVE::Ceph::Tools::create_ecprofile(
			    $ec->@{'profile', 'k', 'm', 'failure-domain', 'device-class'},
			    $rados,
			);
		    };
		    die "could not create erasure code profile '$ec->{profile}': $@\n" if $@;
		    print "created new erasure code profile '$ec->{profile}'\n";
		}

		my $ec_data_param = {};
		# copy all params, should be a flat hash
		$ec_data_param = { map { $_ => $param->{$_} } keys %$param };

		$ec_data_param->{pool_type} = 'erasure';
		$ec_data_param->{allow_ec_overwrites} = 'true';
		$ec_data_param->{erasure_code_profile} = $ec->{profile};
		delete $ec_data_param->{size};
		delete $ec_data_param->{min_size};
		delete $ec_data_param->{crush_rule};

		# metadata pool should be ok with 32 PGs
		$param->{pg_num} = 32;

		$pool = "${name}-metadata";
		$ec->{data_pool} = "${name}-data";

		PVE::Ceph::Tools::create_pool($ec->{data_pool}, $ec_data_param, $rados);
	    }

	    PVE::Ceph::Tools::create_pool($pool, $param, $rados);

	    if ($add_storages) {
		eval { $add_storage->($pool, "${name}", $ec->{data_pool}) };
		die "adding PVE storage for ceph pool '$name' failed: $@\n" if $@;
	    }
	};

	return $rpcenv->fork_worker('cephcreatepool', $pool,  $user, $worker);
    }});


__PACKAGE__->register_method ({
    name => 'destroypool',
    path => '{name}',
    method => 'DELETE',
    description => "Destroy pool",
    proxyto => 'node',
    protected => 1,
    permissions => {
	check => ['perm', '/', [ 'Sys.Modify' ]],
    },
    parameters => {
	additionalProperties => 0,
	properties => {
	    node => get_standard_option('pve-node'),
	    name => {
		description => "The name of the pool. It must be unique.",
		type => 'string',
	    },
	    force => {
		description => "If true, destroys pool even if in use",
		type => 'boolean',
		optional => 1,
		default => 0,
	    },
	    remove_storages => {
		description => "Remove all pveceph-managed storages configured for this pool",
		type => 'boolean',
		optional => 1,
		default => 0,
	    },
	    remove_ecprofile => {
		description => "Remove the erasure code profile. Defaults to true, if applicable.",
		type => 'boolean',
		optional => 1,
		default => 1,
	    },
	},
    },
    returns => { type => 'string' },
    code => sub {
	my ($param) = @_;

	PVE::Ceph::Tools::check_ceph_inited();

	my $rpcenv = PVE::RPCEnvironment::get();
	my $user = $rpcenv->get_user();
	$rpcenv->check($user, '/storage', ['Datastore.Allocate'])
	    if $param->{remove_storages};

	my $pool = $param->{name};

	my $worker = sub {
	    my $storages = $get_storages->($pool);

	    # if not forced, destroy ceph pool only when no
	    # vm disks are on it anymore
	    if (!$param->{force}) {
		my $storagecfg = PVE::Storage::config();
		foreach my $storeid (keys %$storages) {
		    my $storage = $storages->{$storeid};

		    # check if any vm disks are on the pool
		    print "checking storage '$storeid' for RBD images..\n";
		    my $res = PVE::Storage::vdisk_list($storagecfg, $storeid);
		    die "ceph pool '$pool' still in use by storage '$storeid'\n"
			if @{$res->{$storeid}} != 0;
		}
	    }
	    my $rados = PVE::RADOS->new();

	    my $pool_properties = PVE::Ceph::Tools::get_pool_properties($pool, $rados);

	    PVE::Ceph::Tools::destroy_pool($pool, $rados);

	    if (my $ecprofile = $pool_properties->{erasure_code_profile}) {
		print "found erasure coded profile '$ecprofile', destroying its CRUSH rule\n";
		my $crush_rule = $pool_properties->{crush_rule};
		eval { PVE::Ceph::Tools::destroy_crush_rule($crush_rule, $rados); };
		warn "removing crush rule '${crush_rule}' failed: $@\n" if $@;

		if ($param->{remove_ecprofile} // 1) {
		    print "destroying erasure coded profile '$ecprofile'\n";
		    eval { PVE::Ceph::Tools::destroy_ecprofile($ecprofile, $rados) };
		    warn "removing EC profile '${ecprofile}' failed: $@\n" if $@;
		}
	    }

	    if ($param->{remove_storages}) {
		my $err;
		foreach my $storeid (keys %$storages) {
		    # skip external clusters, not managed by pveceph
		    next if $storages->{$storeid}->{monhost};
		    eval { PVE::API2::Storage::Config->delete({storage => $storeid}) };
		    if ($@) {
			warn "failed to remove storage '$storeid': $@\n";
			$err = 1;
		    }
		}
		die "failed to remove (some) storages - check log and remove manually!\n"
		    if $err;
	    }
	};
	return $rpcenv->fork_worker('cephdestroypool', $pool,  $user, $worker);
    }});


__PACKAGE__->register_method ({
    name => 'setpool',
    path => '{name}',
    method => 'PUT',
    description => "Change POOL settings",
    proxyto => 'node',
    protected => 1,
    permissions => {
	check => ['perm', '/', [ 'Sys.Modify' ]],
    },
    parameters => {
	additionalProperties => 0,
	properties => {
	    node => get_standard_option('pve-node'),
	    %{ $ceph_pool_common_options->('nodefault') },
	},
    },
    returns => { type => 'string' },
    code => sub {
	my ($param) = @_;

	PVE::Ceph::Tools::check_ceph_configured();

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

	my $pool = extract_param($param, 'name');
	my $node = extract_param($param, 'node');

	# Ceph uses target_size_bytes
	if (defined($param->{'target_size'})) {
	    my $target_sizestr = extract_param($param, 'target_size');
	    $param->{target_size_bytes} = PVE::JSONSchema::parse_size($target_sizestr);
	}

	my $worker = sub {
	    PVE::Ceph::Tools::set_pool($pool, $param);
	};

	return $rpcenv->fork_worker('cephsetpool', $pool,  $authuser, $worker);
    }});


__PACKAGE__->register_method ({
    name => 'getpool',
    path => '{name}',
    method => 'GET',
    description => "List pool settings.",
    proxyto => 'node',
    protected => 1,
    permissions => {
	check => ['perm', '/', [ 'Sys.Audit', 'Datastore.Audit' ], any => 1],
    },
    parameters => {
	additionalProperties => 0,
	properties => {
	    node => get_standard_option('pve-node'),
	    name => {
		description => "The name of the pool. It must be unique.",
		type => 'string',
	    },
	    verbose => {
		type => 'boolean',
		default => 0,
		optional => 1,
		description => "If enabled, will display additional data".
		    "(eg. statistics).",
	    },
	},
    },
    returns => {
	type => "object",
	properties => {
	    id                     => { type => 'integer', title => 'ID' },
	    pgp_num                => { type => 'integer', title => 'PGP num' },
	    noscrub                => { type => 'boolean', title => 'noscrub' },
	    'nodeep-scrub'         => { type => 'boolean', title => 'nodeep-scrub' },
	    nodelete               => { type => 'boolean', title => 'nodelete' },
	    nopgchange             => { type => 'boolean', title => 'nopgchange' },
	    nosizechange           => { type => 'boolean', title => 'nosizechange' },
	    write_fadvise_dontneed => { type => 'boolean', title => 'write_fadvise_dontneed' },
	    hashpspool             => { type => 'boolean', title => 'hashpspool' },
	    use_gmt_hitset         => { type => 'boolean', title => 'use_gmt_hitset' },
	    fast_read              => { type => 'boolean', title => 'Fast Read' },
	    application_list       => { type => 'array', title => 'Application', optional => 1 },
	    statistics             => { type => 'object', title => 'Statistics', optional => 1 },
	    autoscale_status       => { type => 'object',  title => 'Autoscale Status', optional => 1 },
	    %{ $ceph_pool_common_options->() },
	},
    },
    code => sub {
	my ($param) = @_;

	PVE::Ceph::Tools::check_ceph_inited();

	my $verbose = $param->{verbose};
	my $pool = $param->{name};

	my $rados = PVE::RADOS->new();
	my $res = $rados->mon_command({
		prefix => 'osd pool get',
		pool   => "$pool",
		var    => 'all',
	    });

	my $data = {
	    id                     => $res->{pool_id},
	    name                   => $pool,
	    size                   => $res->{size},
	    min_size               => $res->{min_size},
	    pg_num                 => $res->{pg_num},
	    pg_num_min             => $res->{pg_num_min},
	    pgp_num                => $res->{pgp_num},
	    crush_rule             => $res->{crush_rule},
	    pg_autoscale_mode      => $res->{pg_autoscale_mode},
	    noscrub                => "$res->{noscrub}",
	    'nodeep-scrub'         => "$res->{'nodeep-scrub'}",
	    nodelete               => "$res->{nodelete}",
	    nopgchange             => "$res->{nopgchange}",
	    nosizechange           => "$res->{nosizechange}",
	    write_fadvise_dontneed => "$res->{write_fadvise_dontneed}",
	    hashpspool             => "$res->{hashpspool}",
	    use_gmt_hitset         => "$res->{use_gmt_hitset}",
	    fast_read              => "$res->{fast_read}",
	    target_size            => $res->{target_size_bytes},
	    target_size_ratio      => $res->{target_size_ratio},
	};

	if ($verbose) {
	    my $stats;
	    my $res = $rados->mon_command({ prefix => 'df' });

	    # pg_autoscaler module is not enabled in Nautilus
	    # avoid partial read further down, use new rados instance
	    my $autoscale_status = eval { $get_autoscale_status->() };
	    $data->{autoscale_status} = $autoscale_status->{$pool};

	    foreach my $d (@{$res->{pools}}) {
		next if !$d->{stats};
		next if !defined($d->{name}) && !$d->{name} ne "$pool";
		$data->{statistics} = $d->{stats};
	    }

	    my $apps = $rados->mon_command({ prefix => "osd pool application get", pool => "$pool", });
	    $data->{application_list} = [ keys %$apps ];
	}

	return $data;
    }});


1;