#!/usr/bin/perl
# 
# This does checks for changes that are needed because of version changes. Over time, checks here can be 
# removed.

use strict;
use warnings;
use Anvil::Tools;
use Data::Dumper;
use Text::Diff;

$| = 1;

my $THIS_FILE           =  ($0 =~ /^.*\/(.*)$/)[0];
my $running_directory   =  ($0 =~ /^(.*?)\/$THIS_FILE$/)[0];
if (($running_directory =~ /^\./) && ($ENV{PWD}))
{
	$running_directory =~ s/^\./$ENV{PWD}/;
}

my $anvil = Anvil::Tools->new();

# Get a list of all interfaces with IP addresses.
$anvil->Get->switches({list => [
]});
$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => $anvil->data->{switches}});

$anvil->Database->connect();
$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, level => 2, secure => 0, key => "log_0132" });
if (not $anvil->data->{sys}{database}{connections})
{
	# No databases, exit.
	$anvil->Log->entry({ source => $THIS_FILE, line => __LINE__, level => 0, 'print' => 1, priority => "err", key => "error_0003" });
	$anvil->nice_exit({ exit_code => 1 });
}

my $host_type = $anvil->Get->host_type();
$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { host_type => $host_type }});

if ($host_type eq "striker")
{
	striker_checks($anvil);
}
elsif ($host_type eq "node")
{
	node_checks($anvil);
}
elsif ($host_type eq "dr")
{
	dr_checks($anvil);
}


$anvil->nice_exit({exit_code => 0});


#############################################################################################################
# Functions                                                                                                 #
#############################################################################################################

# Check for things that need to happen on Striker dashboards.
sub striker_checks
{
	my ($anvil) = @_;
	
	# This converts the old/broken 'notifications' tables with the more appropriately named 'alert-override'
	update_notifications($anvil);
	
	### NOTE: Disabled until review complete
	# This checks to make sure that the 'audits' table exists (added late into M3.0 pre-release)
	#update_audits($anvil);
	
	### NOTE: Disabled until review complete
	# This checks to make sure that the new dr_links table exists, and that existing anvil_dr1_host_uuid 
	# entries are copied.
	update_dr_links($anvil);
	
	### TODO: Remove these later. This is here to clean up how we used to handle db_in_use and lock_request flags.
	if (1)
	{
		# Broadly clear all states that are '0' now.
		my $queries = [];
		push @{$queries}, "DELETE FROM states WHERE state_name LIKE 'db_in_use::%' AND state_note != '1';";
		push @{$queries}, "DELETE FROM history.variables WHERE variable_name = 'lock_request';";
		push @{$queries}, "DELETE FROM variables WHERE variable_name = 'lock_request';";
		foreach my $query (@{$queries})
		{
			$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, level => 2, key => "log_0124", variables => { query => $query }});
		}
		$anvil->Database->write({debug => 2, query => $queries, source => $THIS_FILE, line => __LINE__});
	}
	
	return(0);
}

# Check for things that need to happen on Anvil! Subnodes.
sub node_checks
{
	my ($anvil) = @_;
	
	# RHBZ #1961562 - https://bugzilla.redhat.com/show_bug.cgi?id=1961562#c16
	handle_bz1961562($anvil);
	
	# Make sure DRBD compiled after a kernel upgrade.
	$anvil->DRBD->_initialize_kmod({debug => 2});
	
	return(0);
}

# Check for things that need to happen on DR hosts.
sub dr_checks
{
	my ($anvil) = @_;
	
	# RHBZ #1961562 - https://bugzilla.redhat.com/show_bug.cgi?id=1961562#c16
	handle_bz1961562($anvil);
	
	# Make sure DRBD compiled after a kernel upgrade.
	$anvil->DRBD->_initialize_kmod({debug => 2});
	
	return(0);
}

# 
sub update_dr_links
{
	my ($anvil) = @_;
	
	foreach my $uuid (sort {$a cmp $b} keys %{$anvil->data->{cache}{database_handle}})
	{
		my $query = "SELECT COUNT(*) FROM information_schema.tables WHERE table_schema = 'public' AND table_catalog = 'anvil' AND table_name = 'dr_links';";
		$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { query => $query }});
		
		my $count = $anvil->Database->query({query => $query, uuid => $uuid, source => $THIS_FILE, line => __LINE__})->[0]->[0];
		$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { count => $count }});
		
		if (not $count)
		{
			# Add the table.
			my $query = q|
CREATE TABLE dr_links (
    dr_link_uuid          uuid                        not null    primary key, 
    dr_link_host_uuid     uuid                        not null,
    dr_link_anvil_uuid    uuid                        not null,
    dr_link_note          text,                                                 -- Set to 'DELETE' when no longer used.
    modified_date         timestamp with time zone    not null, 
    
    FOREIGN KEY(dr_link_host_uuid) REFERENCES hosts(host_uuid), 
    FOREIGN KEY(dr_link_anvil_uuid) REFERENCES anvils(anvil_uuid) 
);
ALTER TABLE dr_links OWNER TO admin;

CREATE TABLE history.dr_links (
    history_id            bigserial,
    dr_link_uuid          uuid,
    dr_link_host_uuid     uuid,
    dr_link_anvil_uuid    uuid,
    dr_link_note          text, 
    modified_date         timestamp with time zone    not null 
);
ALTER TABLE history.dr_links OWNER TO admin;

CREATE FUNCTION history_dr_links() RETURNS trigger
AS $$
DECLARE
    history_dr_links RECORD;
BEGIN
    SELECT INTO history_dr_links * FROM dr_links WHERE dr_link_uuid = new.dr_link_uuid;
    INSERT INTO history.dr_links
        (dr_link_uuid, 
         dr_link_host_uuid,
         dr_link_anvil_uuid,
         dr_link_note, 
         modified_date)
    VALUES
        (history_dr_links.dr_link_uuid, 
         history_dr_links.dr_link_host_uuid,
         history_dr_links.dr_link_anvil_uuid,
         history_dr_links.dr_link_note, 
         history_dr_links.modified_date);
    RETURN NULL;
END;
$$
LANGUAGE plpgsql;
ALTER FUNCTION history_dr_links() OWNER TO admin;

CREATE TRIGGER trigger_dr_links
    AFTER INSERT OR UPDATE ON dr_links
    FOR EACH ROW EXECUTE PROCEDURE history_dr_links();
|;
			$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, level => 2, key => "log_0124", variables => { query => $query }});
			$anvil->Database->write({debug => 2, uuid => $uuid, query => $query, source => $THIS_FILE, line => __LINE__});
		}
	}
	
	# Now make sure that existing DR entries are copied here.
	$anvil->Database->get_hosts({deubg => 2});
	$anvil->Database->get_dr_links({debug => 2});
	
	foreach my $anvil_name (sort {$a cmp $b} keys %{$anvil->data->{anvils}{anvil_name}})
	{
		my $anvil_uuid          = $anvil->data->{anvils}{anvil_name}{$anvil_name}{anvil_uuid};
		my $anvil_dr1_host_uuid = $anvil->data->{anvils}{anvil_name}{$anvil_name}{anvil_dr1_host_uuid};
		$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { 
			"s1:anvil_name"          => $anvil_name,
			"s2:anvil_uuid"          => $anvil_uuid, 
			"s3:anvil_dr1_host_uuid" => $anvil_dr1_host_uuid, 
		}});
		if ($anvil_dr1_host_uuid)
		{
			my $dr1_host_name = $anvil->data->{hosts}{host_uuid}{$anvil_dr1_host_uuid}{short_host_name};
			$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { dr1_host_name => $dr1_host_name }});
			
			if ((not exists $anvil->data->{dr_links}{by_anvil_uuid}{$anvil_uuid})                                          or 
			    (not exists $anvil->data->{dr_links}{by_anvil_uuid}{$anvil_uuid}{dr_link_host_uuid}{$anvil_dr1_host_uuid}) or 
			    (not exists $anvil->data->{dr_links}{by_anvil_uuid}{$anvil_uuid}{dr_link_host_uuid}{$anvil_dr1_host_uuid}{dr_link_uuid}))
			{
				# Add it.
				my $dr_link_uuid = $anvil->Database->insert_or_update_dr_links({
					debug              => 2,
					dr_link_anvil_uuid => $anvil_uuid, 
					dr_link_host_uuid  => $anvil_dr1_host_uuid, 
					dr_link_note       => "auto_generated",
				});
				$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { dr1_host_name => $dr1_host_name }});
			}
		}
	}

	return(0);
}

# This checks to make sure that the 'audits' table exists (added late into M3.0 pre-release)
sub update_audits
{
	my ($anvil) = @_;

	foreach my $uuid (sort {$a cmp $b} keys %{$anvil->data->{cache}{database_handle}})
	{
		my $query = "SELECT COUNT(*) FROM information_schema.tables WHERE table_schema = 'public' AND table_catalog = 'anvil' AND table_name = 'audits';";
		$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { query => $query }});
		
		my $count = $anvil->Database->query({query => $query, uuid => $uuid, source => $THIS_FILE, line => __LINE__})->[0]->[0];
		$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { count => $count }});
		
		if (not $count)
		{
			# Add the table.
			my $query = q|
CREATE TABLE audits (
    audit_uuid           uuid                        primary key,
    audit_user_uuid      uuid                        not null,       -- This is the users -> user_uuid the audit is tracking
    audit_details        text                        not null,       -- This is the information explaining the action being audited.
    modified_date        timestamp with time zone    not null, 
    
    FOREIGN KEY(audit_user_uuid) REFERENCES users(user_uuid)
);
ALTER TABLE audits OWNER TO admin;

CREATE TABLE history.audits (
    history_id           bigserial,
    audit_uuid           uuid, 
    audit_user_uuid      uuid,
    audit_details        text,
    modified_date        timestamp with time zone    not null
);
ALTER TABLE history.audits OWNER TO admin;

CREATE FUNCTION history_audits() RETURNS trigger
AS $$
DECLARE
    history_audits RECORD;
BEGIN
    SELECT INTO history_audits * FROM audits WHERE audit_uuid = new.audit_uuid;
    INSERT INTO history.audits
        (audit_uuid,
         audit_user_uuid, 
         audit_details, 
         modified_date)
    VALUES
        (history_audit.audit_uuid,
         history_audit.audit_user_uuid, 
         history_audit.audit_details, 
         history_audit.modified_date);
    RETURN NULL;
END;
$$
LANGUAGE plpgsql;
ALTER FUNCTION history_audits() OWNER TO admin;

CREATE TRIGGER trigger_audits
    AFTER INSERT OR UPDATE ON audits
    FOR EACH ROW EXECUTE PROCEDURE history_audits();
|;
			$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, level => 2, key => "log_0124", variables => { query => $query }});
			$anvil->Database->write({debug => 2, uuid => $uuid, query => $query, source => $THIS_FILE, line => __LINE__});
		}
	}
	
	return(0);
}

# This converts the old/broken 'notifications' tables with the more appropriately named 'alert-override'
sub update_notifications
{
	my ($anvil) = @_;
	
	foreach my $uuid (sort {$a cmp $b} keys %{$anvil->data->{cache}{database_handle}})
	{
		my $query = "SELECT COUNT(*) FROM information_schema.tables WHERE table_schema = 'public' AND table_catalog = 'anvil' AND table_name = 'notifications';";
		$anvil->Log->variables({source => $THIS_FILE, uuid => $uuid, line => __LINE__, level => 2, list => { query => $query }});
		
		my $count = $anvil->Database->query({query => $query, source => $THIS_FILE, line => __LINE__})->[0]->[0];
		$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { count => $count }});
		
		if ($count)
		{
			my $queries = [];
			push @{$queries}, "DROP FUNCTION history_notifications() CASCADE;";
			push @{$queries}, "DROP TABLE history.notifications;";
			push @{$queries}, "DROP TABLE public.notifications;";
			push @{$queries}, q|CREATE TABLE alert_overrides (
    alert_override_uuid              uuid                        not null    primary key,
    alert_override_recipient_uuid    uuid                        not null,                    -- The recipient we're linking.
    alert_override_host_uuid         uuid                        not null,                    -- This host_uuid of the referenced machine
    alert_override_alert_level       integer                     not null,                    -- This is the alert level (at or above) that this user wants alerts from. If set to '-1', the record is deleted.
    modified_date                  timestamp with time zone    not null,
    
    FOREIGN KEY(alert_override_host_uuid)      REFERENCES hosts(host_uuid),
    FOREIGN KEY(alert_override_recipient_uuid) REFERENCES recipients(recipient_uuid)
);
ALTER TABLE alert_overrides OWNER TO admin;

CREATE TABLE history.alert_overrides (
    history_id                     bigserial,
    alert_override_uuid              uuid,
    alert_override_recipient_uuid    uuid,
    alert_override_host_uuid         uuid,
    alert_override_alert_level       integer,
    modified_date                  timestamp with time zone    not null
);
ALTER TABLE history.alert_overrides OWNER TO admin;

CREATE FUNCTION history_alert_overrides() RETURNS trigger
AS $$
DECLARE
    history_alert_overrides RECORD;
BEGIN
    SELECT INTO history_alert_overrides * FROM alert_overrides WHERE alert_override_uuid = new.alert_override_uuid;
    INSERT INTO history.alert_overrides
        (alert_override_uuid, 
         alert_override_recipient_uuid, 
         alert_override_host_uuid, 
         alert_override_alert_level, 
         modified_date)
    VALUES
        (history_alert_overrides.alert_override_uuid,
         history_alert_overrides.alert_override_recipient_uuid, 
         history_alert_overrides.alert_override_host_uuid, 
         history_alert_overrides.alert_override_alert_level, 
         history_alert_overrides.modified_date);
    RETURN NULL;
END;
$$
LANGUAGE plpgsql;
ALTER FUNCTION history_alert_overrides() OWNER TO admin;

CREATE TRIGGER trigger_alert_overrides
    AFTER INSERT OR UPDATE ON alert_overrides
    FOR EACH ROW EXECUTE PROCEDURE history_alert_overrides();
|;
			foreach my $query (@{$queries})
			{
				$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, level => 2, key => "log_0124", variables => { query => $query }});
			}
			$anvil->Database->write({debug => 2, uuid => $uuid, query => $queries, source => $THIS_FILE, line => __LINE__});
		}
	}
	
	return(0);
}

sub handle_bz1961562
{
	my ($anvil) = @_;
	
	### TODO: Test that this is fixed. The bug is now ERRATA
	# RHBZ #1961562 - https://bugzilla.redhat.com/show_bug.cgi?id=1961562#c16
	# We're a node or DR host. We need to touch this file.
	my $work_around_file = "/etc/qemu/firmware/50-edk2-ovmf-cc.json";
	$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { work_around_file => $work_around_file }});
	if (not -e $work_around_file)
	{
		$anvil->Storage->write_file({
			debug     => 2,
			file      => $work_around_file, 
			body      => "", 
			overwrite => 0,
			backup    => 0,
			mode      => "0644", 
			user      => "root", 
			group     => "root",
		});
	}
	
	return(0);
}