#!/usr/bin/perl

use strict;
use warnings;
use Anvil::Tools;
use JSON;
use Data::Dumper;

$| = 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();

sub is_array
{
	return ref($_[0]) eq "ARRAY";
}

sub is_hash
{
	return ref($_[0]) eq "HASH";
}

sub db_access
{
	my $parameters     = shift;
	my $db_access_mode = $parameters->{db_access_mode};
	my $db_uuid        = $parameters->{db_uuid};
	my $sql_query      = $parameters->{sql_query};

	my $access_parameters = { query => $sql_query, uuid => $db_uuid, source => $THIS_FILE, line => __LINE__ };

	return ($db_access_mode eq "write")
		? { write_code => $anvil->Database->write($access_parameters) }
		: $anvil->Database->query($access_parameters);
}

sub call_pre_data_fns
{
	my $parameters = shift;
	my $fns        = $parameters->{fns};

	if (is_array($fns))
	{
		foreach my $fn_wrapper ( @{$fns} )
		{
			if (is_array($fn_wrapper))
			{
				my $pre_chain    = @{$fn_wrapper}[0] // "";
				my @fn_params    = @{$fn_wrapper}[1..$#{$fn_wrapper}] // ();
				my @chain        = split(/->|,/, $pre_chain);
				my $intermediate = $anvil;
				my $key_index    = 0;

				foreach my $key ( @chain )
				{
					last if not defined $intermediate->${key};

					if ($key_index == $#chain && $intermediate->can($key))
					{
						eval { $intermediate->${key}(@fn_params); };
					}
					else
					{
						$intermediate = $intermediate->${key};
					}

					$key_index += 1;
				}
			}
		}
	}
}

sub get_anvil_data
{
	my $parameters = shift;
	my $chain      = $parameters->{chain};

	my $source_intermediate = $anvil->data;
	my $target_intermediate = $parameters->{data};
	my $key_index           = 0;

	foreach my $key ( @{$chain} )
	{
		last if not exists $source_intermediate->{$key};

		$source_intermediate = $source_intermediate->{$key};

		if (not exists $target_intermediate->{$key})
		{
			$target_intermediate->{$key} = {};
		}

		if ($key_index < $#{$chain})
		{
			$target_intermediate = $target_intermediate->{$key};
		}
		else
		{
			$target_intermediate->{$key} = $source_intermediate;
		}

		$key_index += 1;
	}
}

sub call_fn
{
	my $parameters = shift;
	my $chain      = $parameters->{chain};
	my $fallback   = $parameters->{fallback};
	my $fn_wrapper = $parameters->{fn};

	if (exists $fn_wrapper->{fn})
	{
		my $fn        = $fn_wrapper->{fn};
		my $fn_params = $fn_wrapper->{params};

		$fn_params->{chain} = $chain;

		return $fn->($fn_params);
	}
	else
	{
		return $fallback;
	}
}

sub foreach_nested
{
	my $parameters   = shift;
	# Required parameters:
	my $hash         = $parameters->{hash};
	# Optional parameters:
	my $chain        = exists $parameters->{chain}        ? $parameters->{chain}        : ();
	my $depth        = exists $parameters->{depth}        ? $parameters->{depth}        : 0;
	my $on_key       = exists $parameters->{on_key}       ? $parameters->{on_key}       : {};
	my $on_chain_end = exists $parameters->{on_chain_end} ? $parameters->{on_chain_end} : {};

	foreach my $key (keys %{$hash})
	{
		my $is_continue_chain = 1;
		my $value             = $hash->{$key};

		push(@{$chain}, $key);

		$is_continue_chain = call_fn({ chain => $chain, fallback => $is_continue_chain, fn => $on_key });

		if ( ($is_continue_chain) && is_hash($value) )
		{
			foreach_nested({
				chain        => $chain,
				depth        => $depth + 1,
				hash         => $value,
				on_chain_end => $on_chain_end,
				on_key       => $on_key,
			});
		}
		else
		{
			call_fn({ chain => $chain, fn => $on_chain_end });
		}

		pop(@{$chain});
	}
}

$anvil->Get->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 $data_hash       = $anvil->data->{switches}{'data'};
my $db_access_mode  = defined $anvil->data->{switches}{'mode'} ? $anvil->data->{switches}{'mode'} : "";
my $db_uuid         = $anvil->data->{switches}{'uuid'};
my $pre_data        = $anvil->data->{switches}{'predata'};
my $sql_query       = $anvil->data->{switches}{'query'};
my $sub_module_name = defined $anvil->data->{switches}{'sub-module'} ? $anvil->data->{switches}{'sub-module'} : "Database";
my $sub_name        = defined $anvil->data->{switches}{'sub'} ? $anvil->data->{switches}{'sub'} : "";
my $sub_params      = defined $anvil->data->{switches}{'sub-params'} ? $anvil->data->{switches}{'sub-params'} : "{}";

if ($sql_query)
{
	my $results = db_access({ db_uuid => $db_uuid, sql_query => $sql_query, db_access_mode => $db_access_mode });
	print JSON->new->utf8->encode($results)."\n";
}
elsif ($anvil->${sub_module_name}->can($sub_name))
{
    my $decoded_sub_params;
    my $is_decode_sub_params_success = eval { $decoded_sub_params = decode_json($sub_params); };

    if (not $is_decode_sub_params_success)
    {
        print STDERR "error: failed to parse subroutine parameters\n";
        $anvil->nice_exit({ exit_code => 1 });
    }

    my $results = $anvil->${sub_module_name}->${sub_name}($decoded_sub_params);
    print JSON->new->utf8->encode({ sub_results => $results })."\n";
}
elsif ($data_hash)
{
	if ($pre_data)
	{
		my $decoded_pre_data;
		my $is_decode_pre_data_success = eval { $decoded_pre_data = decode_json($pre_data); };

		if ($is_decode_pre_data_success && is_array($decoded_pre_data))
		{
			call_pre_data_fns({ fns => $decoded_pre_data });
		}
	}

	my $decoded_data_hash;
	my $is_decode_data_hash_success = eval { $decoded_data_hash = decode_json($data_hash); };

	if (not $is_decode_data_hash_success)
	{
		print STDERR "error: failed to parse data structure\n";
        $anvil->nice_exit({ exit_code => 1 });
	}

	my $get_anvil_data_params = { data => {} };

	foreach_nested({
		hash         => $decoded_data_hash,
		on_chain_end => { fn => \&get_anvil_data, params => $get_anvil_data_params },
	});

	print JSON->new->utf8->allow_blessed->encode($get_anvil_data_params->{data})."\n";
}
else
{
	print STDERR "error: missing switches and perhaps their respective parameters; one of --data, --query, or --sub is required\n";
	$anvil->nice_exit({ exit_code => 1 });
}

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