#!/usr/bin/perl 

# Copyright (c) 2020 Freda Bundchen

# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

use warnings;
use strict;

use Getopt::Std qw(getopts);

our ($opt_I);

# === SUBROUTINES  =====================================================

sub import_account ($$$$) {
	my ($account_name, $compiled_ref, $delim, $csv_account) = @_;
	my ($account, $amount, $booking, $credit, $date, $debit,
	    $description);
	chomp(my $header = <>);
	while (<>) {
		next if (/^$/);
		chomp;
		my $line = $_;
		my @fields = split /$delim/, $line;
		my $matches = 0;
		foreach my $selector (@$compiled_ref) {
			$matches = 1;
			for (my $i = 0; $i <= $#{$selector->{re}}; $i++) {
				next if $fields[$i] =~ $selector->{re}[$i];
				$matches = 0;
				last;
			}
			if ($matches) {
				$account = $selector->{ac};
				$booking = $selector->{id};
				last;
			}
		}
		$matches or die "unmatched CSV line: $line";
		if ($account_name eq "chase_credit") {
			($date, $amount, $debit, $credit,
			    $description) =
			    import_chase_credit($account,
			    $csv_account, $line);
		} elsif ($account_name eq "capital_one_credit") {
			($date, $amount, $debit, $credit,
			    $description) =
			    import_capital_one_credit($account,
			    $csv_account, $line);
		} elsif ($account_name eq "optum_hsa") {
			($date, $amount, $debit, $credit,
			    $description) =
			    import_optum_hsa($account,
			    $csv_account, $line);
		} elsif ($account_name eq "sparkasse_camt") {
			($date, $amount, $debit, $credit,
			    $description) =
			    import_sparkasse_camt($account,
			    $csv_account, $line);
		} else {
			die "undefined format: $account_name";
		}
		unless ($date && $booking && $debit && $credit &&
		    $amount && $description) {
			die "import parse error: $line";
		}
		$description =~ s/#//g;
		print "$date $booking $debit $credit $amount " .
		    "$description\n";
	}
}

sub import_chase_credit ($$$) {
	my ($account, $csv_account, $line) = @_;
	my ($trans_date, $post_date, $description, $category,
	    $type, $amount) = split /,/, $line;
	my ($debit, $credit);
	$post_date =~ s#(\d+)/(\d+)/(\d+)#$3$1$2#; 
	($amount, $debit, $credit) =
	    get_accounts_by_amount_sign($amount, $account,
	    $csv_account);
	return ($post_date, $amount, $debit, $credit, $description);
}

sub import_capital_one_credit ($$$) {
	my ($account, $csv_account, $line) = @_;
	my ($trans_date, $post_date, $card_num,
	    $description, $category, $csv_debit,
	    $csv_credit) = split /,/, $line;
	$post_date =~ s/(\d+)-(\d+)-(\d+)/$1$2$3/; 
	my ($amount, $debit, $credit) = 
	    get_accounts_by_csv_col($account, $csv_account,
	    $csv_debit, $csv_credit);
	return ($post_date, $amount, $debit, $credit, $description);
}

sub import_optum_hsa ($$$) {
        my ($account, $csv_account, $line) = @_;
        my ($date, $description, $amount,
            $type) = split /,/, $line;
	my ($debit, $credit);
	$date =~ s/(\d+)-(\d+)-(\d+)/$1$2$3/;
	$amount =~ s/\$//;
	($amount, $debit, $credit) =
	    get_accounts_by_amount_sign($amount, $account,
	    $csv_account);
	return ($date, $amount, $debit, $credit, $description);
}

sub import_sparkasse_camt ($$$) {
        my ($account, $csv_account, $line) = @_;
	my @fields;
	$_ = $line;
	push @fields, $1 while s/"([^"]*)";?//;
	$_ eq "" or die "CAMT parse error before $_ in $line";
	@fields == 17 or die "not 17 but @fields fields: $line";
	$fields[1] =~ s/^(\d\d)\.(\d\d)\.(\d\d)$/20$3$2$1/
	    or die "date parse error: $line";
	$fields[14] =~ s/,/./;
	return $fields[1],
	    get_accounts_by_amount_sign($fields[14], $account, $csv_account),
	    (join ' ', $fields[11], $fields[4]);
}

sub get_accounts_by_amount_sign ($$$) {
	my ($amount, $account, $csv_account) = @_;
	my ($debit, $credit);
	if ($amount <= 0) {
		$amount = substr $amount, 1;
		$credit = $csv_account;	
		$debit = $account;
	} else {
		$debit = $csv_account;	
		$credit = $account;
	}
	return ($amount, $debit, $credit);
}

sub get_accounts_by_csv_col ($$$$) {
	my ($account, $csv_account, $csv_debit, $csv_credit) = @_;
	my ($amount, $debit, $credit);
	if ($csv_debit eq "") {
		$amount = $csv_credit;
		$credit = $account;
		$debit = $csv_account;
	} else {
		$amount = $csv_debit;
		$credit = $csv_account;
		$debit = $account;
	}
	return ($amount, $debit, $credit);
}

sub usage () {
	printf STDERR "usage: %s -I accountname csvfilename\n", $0;
	exit 1;
}

# === MAIN PROGRAM =====================================================

my ($csv_account, $fn, $in, $account_name, $delim, @compiled);
getopts 'I:' or usage;
if ($opt_I) {
	$account_name = $opt_I;
	$fn = "import_" . $account_name . ".txt";
	open $in, $fn or die "$fn: $!";
} else {
	usage;
}
while (<$in>) {
	chomp;
	next if /^(?:#|$)/;
	my $line = $_;
	if (/^ACCOUNT\s+(\S+)$/) {
		$csv_account and die "duplicate ACCOUNT line: $1";
		$csv_account = $1;
		next;
	}
	if (/^DELIM\s+(\S)$/) {
		$delim and die "duplicate DELIM line: $1";
		$delim = $1;
		next;
	}
	$delim or die "no DELIM line in $fn";
	s/^(.*)$delim\s+(\d+)\s+(\S+)// or
	    die "$fn import parse error: $line";
	push @compiled, {
		re => [map { qr/$_/ } split /$delim/, $1],
		ac => $2,
		id => $3,
	};
}
close $in;
$csv_account or die "no ACCOUNT line in $fn";
import_account($account_name, \@compiled, $delim, $csv_account);