#!/usr/bin/perl -w
#
# usage: ./db-idempotent-populate <Oceanname>
#  creates or updates OCEAN-Oceanname.db
#  from master-master.txt

# This is part of ypp-sc-tools, a set of third-party tools for assisting
# players of Yohoho Puzzle Pirates.
#
# Copyright (C) 2009 Ian Jackson <ijackson@chiark.greenend.org.uk>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
# Yohoho and Puzzle Pirates are probably trademarks of Three Rings and
# are used without permission.  This program is not endorsed or
# sponsored by Three Rings.

use strict (qw(vars));

use DBI;

use Commods;

@ARGV==1 or die;
my ($oceanname) = @ARGV;

my $dbfn= "OCEAN-$oceanname.db";

our $dbh;

sub dbdoall ($) {
    foreach my $cmd (split /\;/, $_[0]) {
	$dbh->do("$cmd;") if $cmd =~ m/\S/;
    }
}

#---------- setup ----------

parse_masters_ocean($oceanname);
our $ocean= $oceans{$oceanname};

$dbh= DBI->connect("dbi:SQLite:$dbfn",'','',
		   { AutoCommit=>0,
		     RaiseError=>1, ShowErrorStatement=>1,
		     unicode=>1 })
    or die "$dbfn $DBI::errstr ?";

#---------- schema ----------

foreach my $bs (qw(buy sell)) {
    dbdoall(<<END)
 CREATE TABLE IF NOT EXISTS $bs (
	commodid	INTEGER			NOT NULL,
	islandid	INTEGER			NOT NULL,
	stallid		INTEGER			NOT NULL,
	price		INTEGER			NOT NULL,
	qty		INTEGER			NOT NULL,
	PRIMARY KEY (commodid, islandid, stallid)
 );
 CREATE INDEX IF NOT EXISTS ${bs}_by_island ON $bs (commodid, islandid, price);
 CREATE INDEX IF NOT EXISTS ${bs}_by_price  ON $bs (commodid, price, islandid);
END
    ;
}

dbdoall(<<END)
 CREATE TABLE IF NOT EXISTS commods (
	commodid	INTEGER	PRIMARY KEY AUTOINCREMENT NOT NULL,
	commodname	TEXT	UNIQUE		NOT NULL,
	unitmass	INTEGER,
	unitvolume	INTEGER
 );
 CREATE TABLE IF NOT EXISTS islands (
	islandid	INTEGER	PRIMARY KEY AUTOINCREMENT NOT NULL,
	islandname	TEXT	UNIQUE		NOT NULL,
	archipelago	TEXT			NOT NULL
 );
 CREATE TABLE IF NOT EXISTS stalls (
	stallid		INTEGER	PRIMARY KEY AUTOINCREMENT NOT NULL,
	islandid	INTEGER			NOT NULL,
	stallname	TEXT			NOT NULL,
	UNIQUE (islandid, stallname)
 );
 CREATE TABLE IF NOT EXISTS uploads (
	islandid	INTEGER PRIMARY KEY	NOT NULL,
	age		INTEGER			NOT NULL,
	clientspec	TEXT			NOT NULL,
	serverspec	TEXT			NOT NULL
 );
 CREATE TABLE IF NOT EXISTS dists (
	aiid		INTEGER			NOT NULL,
	biid		INTEGER			NOT NULL,
	dist		INTEGER			NOT NULL,
	PRIMARY KEY (aiid, biid)
 );
END
    ;

$dbh->commit;

#---------- commodity list ----------

{
    my $sth= $dbh->prepare(<<'END')
 INSERT OR IGNORE INTO commods (commodname) VALUES (?);
END
    ;
    foreach my $commod (sort keys %commods) {
	$sth->execute($commod);
    }
    $dbh->commit;
}

#---------- island list ----------

{
    my $sth= $dbh->prepare(<<'END')
 INSERT OR IGNORE INTO islands (islandname, archipelago) VALUES (?, ?);
END
    ;
    foreach my $archname (sort keys %$ocean) {
	my $arch= $ocean->{$archname};
	foreach my $islandname (sort keys %$arch) {
	    $sth->execute($islandname, $archname);
	}
    }
    $dbh->commit;
}

#---------- routes ----------

{
    foreach my $islandname (sort keys %{ $route_mysteries{$oceanname} }) {
	warn "$route_mysteries{$oceanname}{$islandname} routes".
	    " for unknown island $islandname\n";
    }

    dbdoall(<<END)
 CREATE TEMPORARY TABLE newdists (
	aiid		INTEGER			NOT NULL,
	biid		INTEGER			NOT NULL,
	dist		INTEGER			NOT NULL
 );
 INSERT INTO newdists SELECT (aiid,biid,dist) FROM dists;
 INSERT INTO newdists SELECT (biid,aiid,dist) FROM dists;
 INSERT INTO newdists SELECT (islandid,islandid,0) FROM islands;
END
    ;

    my $sth= $dbh->prepare(<<'END')
 INSERT INTO newdists VALUES
	((SELECT islandid FROM islands WHERE islandname == ?),
	 (SELECT islandid FROM islands WHERE islandname == ?),
	 ?);
END
    ;
    my $allroutes= $routes{$oceanname};
    foreach my $an (keys %$allroutes) {
	my $routes= $allroutes->{$an};
	foreach my $bn (keys %$routes) {
	    $sth->execute($an, $bn, $routes->{$bn});
	}
    }

    my $stmt_updatemain= $dbh->prepare(<<'END')
 UPDATE dists SET dist = (
	SELECT min(dist) FROM newdists
	WHERE dists.aiid == newdists.aiid
	  AND dists.biid == newdists.biid
	  AND NOT dists.dist <= newdists.dist
 );
END

    my $stmt_removeredund= $dbh->prepare(<<'END')
 DELETE FROM newdists
	WHERE dist > (
		SELECT dists.dist
		WHERE dists.aiid == newdists.aiid
		  AND dists.aiid == newdists.aiid
 );
END
    ;

    my $stmt_gennew= $dbh->prepare(<<'END')
 INSERT INTO newdists (
	SELECT src.aiid, dst.biid, min(src.dist + dst.dist)
	FROM dists AS src, dists AS dst ON src.biid == dst.aiid
	GROUP BY src.aiid, dst.biid
 );
END
    ;
    
    for (;;) {
	$ar= $dbh->selectall_arrayref("select ia.islandname, ib.islandname,newdists.dist from newdists, islands as ia on newdists.aiid = ia.islandid, islands as ib on newdists.biid = ib.islandid;");
	print Dumper($ar);

	my $affected= $stmt_updatemain->execute();
	last unless $affected;

	$stmt_
	
}

#use Data::Dumper;
#print Dumper(\%routes);

__DATA__