#!/usr/bin/env perl

#
# PostGIS - Spatial Types for PostgreSQL
# http://postgis.net
#
# Copyright (C) 2013-2022 Sandro Santilli <strk@kbt.io>
#
# This is free software; you can redistribute and/or modify it under
# the terms of the GNU General Public Licence. See the COPYING file.
#

use warnings;
use strict;
use POSIX 'strftime';

eval "exec perl -w $0 $@"
	if (0);


die "Usage: perl $0 <extname> [<sql>]\n"
  . "  Prints SQL to add objects created by given SQL\n"
  . "  to extension with given name.\n"
unless @ARGV;

my $extname = shift(@ARGV);
my $scriptname = @ARGV ? $ARGV[0] : '-';

# drops are in the following order:
#	1. Indexing system stuff
#	2. Meta datatables <not done>
#	3. Aggregates
#	3. Casts
#	4. Operators
#	5. Functions
#	6. Types
#	7. Tables

my @aggs = ();
my @casts = ();
my @funcs = ();
my @types = ();
my %type_funcs = ();
my @ops = ();
my @opcs = ();
my @views = ();
my @tables = ();
my @sequences = ();
my @schemas = ();

sub strip_default {
	my $line = shift;
	# strip quotes first
	$line =~ s/'[^']*'//ig;
	# drop default then
	$line =~ s/DEFAULT [^,)]*//ig;
	return $line;
}

while( my $line = <>)
{
	if ($line =~ /^create (or replace )?function/i) {
		my $defn = $line;
		while( not $defn =~ /\)/ ) {
			$defn .= <>;
		}
		push (@funcs, $defn)
	}
	elsif ($line =~ /^create or replace view\s*(\w+)/i) {
		push (@views, $1);
	}
	elsif ($line =~ /^create table \s*([\w\.]+)/i) {
		#print STDERR "XXX table $1\n";
		my $fqtn = $1;
		push (@tables, $fqtn);
		my $defn = $line;
		while( not $defn =~ /\)/ ) {
			#print STDERR "XXX defn $defn\n";
			if ($defn =~ /([\w]+) serial\b/i) {
				my $seq = "${fqtn}_$1_seq";
				#print STDERR "XXX serial field [$seq]\n";
				push (@sequences, $seq);
			}
			$defn = <>;
		}
	}
	elsif ($line =~ /^create schema \s*([\w\.]+)/i) {
		push (@schemas, $1);
	}
	elsif ( $line =~ /^create operator class (\w+)/i ) {
		my $opcname = $1;
		my $am = '';
		while( not $line =~ /;\s*$/ ) {
			if ( $line =~ /( USING (\w+))/ ) {
				$am = $1;
				last;
			}
			$line .= <>;
		}
		if ( $am eq '' ) {
			die "Couldn't parse CREATE OPERATOR CLASS $opcname\n";
		} else {
			$opcname .= $am;
		}
		push (@opcs, $opcname)
	}
	elsif ($line =~ /^create operator.*\(/i) {
		my $defn = $line;
		while( not $defn =~ /;\s*$/ ) {
			$defn .= <>;
		}
		push (@ops, $defn)
	}
	elsif ($line =~ /^create aggregate/i) {
		my $defn = $line;
		while( not $defn =~ /;\s*$/ ) {
			$defn .= <>;
		}
		push (@aggs, $defn)
	}
	elsif ($line =~ /^create type ([\w\.]+)/i) {
		push (@types, $1);
		while( not $line =~ /;\s*$/ ) {
			$line = <>;
			if ( $line =~ /(input|output|send|receive|typmod_in|typmod_out|analyze)\s*=\s*(\w+)/ ) {
        my $role = ${1};
        my $fname = ${2};
				$type_funcs{$fname} = $role;
			}
		}
	}
	elsif ($line =~ /^create domain ([\w\.]+)/i) {
		push (@types, $1);
	}
	elsif ($line =~ /^create cast/i) {
		push (@casts, $line)
	}
}

#close( INPUT );

sub add_if_not_exists
{
  my $obj = shift;

	# Prevent troubles by refusing to accept single quotes
	# in objects
	die "Invalid characters in object definition: $obj" if $obj =~ /'/;

	$obj =~ m/([^ ]*) (.*)/s; # can be multiline
	my $type = $1;
	my $sig = $2;


  print "SELECT _postgis_package_object('$type', '$sig');\n";
}

my $time = POSIX::strftime("%F %T", gmtime(defined($ENV{SOURCE_DATE_EPOCH}) ? $ENV{SOURCE_DATE_EPOCH} : time));
print <<"EOF";
-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
--
-- PostGIS - Spatial Types for PostgreSQL
-- http://postgis.net
--
-- This is free software; you can redistribute and/or modify it under
-- the terms of the GNU General Public Licence. See the COPYING file.
--
-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
--
-- Generated on: $time
--           by: $0
--          for: $extname
--         from: $scriptname
--
-- Do not edit manually, your changes will be lost.
--
-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --


-- complain if script is sourced in psql
\\echo Use "CREATE EXTENSION ${extname} to load this file. \\quit

CREATE FUNCTION _postgis_package_object(type text, sig text)
RETURNS VOID
AS \$\$
DECLARE
	sql text;
	proc regproc;
	obj text := format('%s %s', type, sig);
BEGIN

	sql := format('ALTER EXTENSION ${extname} ADD %s', obj);
	EXECUTE sql;
	RAISE NOTICE 'newly registered %', obj;

EXCEPTION
WHEN object_not_in_prerequisite_state THEN
  IF SQLERRM ~ '\\m${extname}\\M'
  THEN
    RAISE NOTICE '% already registered', obj;
  ELSE
    RAISE EXCEPTION '%', SQLERRM;
  END IF;
WHEN
	undefined_function OR
	undefined_table OR
	undefined_object
	-- TODO: handle more exceptions ?
THEN
	RAISE NOTICE '% % does not exist yet', type, sig;
WHEN OTHERS THEN
	RAISE EXCEPTION 'Trying to add % to ${extname}, got % (%)', obj, SQLERRM, SQLSTATE;
END;
\$\$ LANGUAGE 'plpgsql';
EOF

print "-- Register all views.\n";
foreach my $view (@views)
{
	add_if_not_exists("VIEW $view");
}

print "-- Register all tables.\n";
# we reverse table definitions so foreign key constraints
# are more likely not to get in our way
@tables = reverse(@tables);
foreach my $table (@tables)
{
	add_if_not_exists("TABLE $table");
}

print "-- Register all sequences.\n";
foreach my $seq (@sequences)
{
	add_if_not_exists("SEQUENCE $seq");
}


print "-- Register all aggregates.\n";
foreach my $agg (@aggs)
{
	if ( $agg =~ /create aggregate\s*([\w\.]+)\s*\(\s*.*basetype = ([\w\.]+)/ism )
	{
		add_if_not_exists("AGGREGATE $1 ($2)");
	}
	elsif ( $agg =~ /create aggregate\s*([\w\.]+)\s*\(\s*([\w,\.\s\[\]]+)\s*\)/ism )
	{
		add_if_not_exists("AGGREGATE $1 ($2)");
	}
	else
	{
		die "Couldn't parse AGGREGATE line: $agg\n";
	}
}

print "-- Register all operators classes and families.\n";
foreach my $opc (@opcs)
{
	add_if_not_exists("OPERATOR CLASS $opc");
	add_if_not_exists("OPERATOR FAMILY $opc");
}

print "-- Register all operators.\n";
foreach my $op (@ops)
{
	if ($op =~ /create operator ([^(]+)\s*\(.*LEFTARG\s*=\s*(\w+),\s*RIGHTARG\s*=\s*(\w+).*/ism )
	{
		add_if_not_exists("OPERATOR $1 ($2,$3)");
	}
	else
	{
		die "Couldn't parse OPERATOR line: $op\n";
	}
}


print "-- Register all casts.\n";
foreach my $cast (@casts)
{
	if ($cast =~ /create cast\s*\((.+?)\)/i )
	{
		add_if_not_exists("CAST ($1)");
	}
	else
	{
		die "Couldn't parse CAST line: $cast\n";
	}
}

print "-- Register all functions.\n";
foreach my $fn ( @funcs )
{
	if ($fn =~ /.* function ([^(]+)\((.*)\)/is ) # can be multiline
	{
		my $fn_nm = $1;
		my $fn_arg = $2;

		$fn_arg = strip_default($fn_arg);
		add_if_not_exists("FUNCTION $fn_nm ($fn_arg)");
	}
	else
	{
		die "Couldn't parse FUNCTION line: $fn\n";
	}
}

print "-- Register all types.\n";
foreach my $type (@types)
{
	add_if_not_exists("TYPE $type");
}


# NOTE:  cannot add schema "topology" to extension "postgis_topology"
#        because the schema contains the extension
#
#print "-- Register all schemas.\n";
#if (@schemas)
#{
#  foreach my $schema (@schemas)
#  {
#    add_if_not_exists("SCHEMA \"$schema\"");
#  }
#}


print <<"EOF";
DROP FUNCTION _postgis_package_object(text, text);

-- Security checks
DO LANGUAGE 'plpgsql' \$BODY\$
DECLARE
	rec RECORD;
	sql TEXT;
BEGIN

	-- Check extension functions are all owned by a superuser
	FOR rec IN
		SELECT
			p.oid,
			p.proowner,
			e.extowner,
			r.rolsuper
		FROM pg_catalog.pg_depend AS d
			INNER JOIN pg_catalog.pg_extension AS e ON (d.refobjid = e.oid)
			INNER JOIN pg_catalog.pg_proc AS p ON (d.objid = p.oid)
			INNER JOIN pg_catalog.pg_roles AS r ON (r.oid = p.proowner)
		WHERE d.refclassid = 'pg_catalog.pg_extension'::pg_catalog.regclass
		AND deptype = 'e'
		AND e.extname = '${extname}'
		AND d.classid = 'pg_catalog.pg_proc'::pg_catalog.regclass
	LOOP
		IF NOT rec.rolsuper THEN
			RAISE EXCEPTION 'Function % is owned by non-superuser %',
					rec.oid::regprocedure, rec.proowner::regrole;
		END IF;
		IF NOT rec.proowner = rec.extowner THEN
			RAISE NOTICE
					'Changing ownership of function % from % to % to match ext',
					rec.oid::regprocedure, rec.proowner::regrole,
					rec.extowner::regrole;
			sql := format(
				'ALTER FUNCTION %s OWNER TO %I',
				rec.oid::regprocedure,
				rec.extowner::regrole
			);
			EXECUTE sql;
		END IF;
	END LOOP;

	-- TODO: check ownership of more objects ?

END;
\$BODY\$;


EOF

print "\n";

1;
