package PVE::CLIFormatter;

use strict;
use warnings;

use I18N::Langinfo;
use YAML::XS; # supports Dumping JSON::PP::Boolean
$YAML::XS::Boolean = "JSON::PP";

use PVE::JSONSchema;
use PVE::PTY;
use PVE::Format;

use JSON;
use utf8;
use Encode;

PVE::JSONSchema::register_renderer('timestamp', \&PVE::Format::render_timestamp);
PVE::JSONSchema::register_renderer('timestamp_gmt', \&PVE::Format::render_timestamp_gmt);
PVE::JSONSchema::register_renderer('duration', \&PVE::Format::render_duration);
PVE::JSONSchema::register_renderer(
    'fraction_as_percentage',
    \&PVE::Format::render_fraction_as_percentage,
);
PVE::JSONSchema::register_renderer('bytes', \&PVE::Format::render_bytes);

sub render_yaml {
    my ($value) = @_;

    my $data = YAML::XS::Dump($value);
    $data =~ s/^---[\n\s]//; # remove yaml marker

    return $data;
}

PVE::JSONSchema::register_renderer('yaml', \&render_yaml);

sub query_terminal_options {
    my ($options) = @_;

    $options //= {};

    if (-t STDOUT) {
        ($options->{columns}) = PVE::PTY::tcgetsize(*STDOUT);
    }

    $options->{encoding} = I18N::Langinfo::langinfo(I18N::Langinfo::CODESET());

    $options->{utf8} = 1 if $options->{encoding} eq 'UTF-8';

    return $options;
}

sub data_to_text {
    my ($data, $propdef, $options, $terminal_opts) = @_;

    return '' if !defined($data);

    $terminal_opts //= {};

    my $human_readable = $options->{'human-readable'} // 1;

    if ($human_readable && defined($propdef)) {
        if (my $type = $propdef->{type}) {
            if ($type eq 'boolean') {
                return $data ? 1 : 0;
            }
        }
        if (!defined($data) && defined($propdef->{default})) {
            return "($propdef->{default})";
        }
        if (defined(my $renderer = $propdef->{renderer})) {
            my $code = PVE::JSONSchema::get_renderer($renderer);
            die "internal error: unknown renderer '$renderer'" if !$code;
            return $code->($data, $options, $terminal_opts);
        }
    }

    if (my $class = ref($data)) {
        # JSON::PP::Boolean requires allow_nonref
        return to_json($data, { allow_nonref => 1, canonical => 1 });
    } else {
        return "$data";
    }
}

# prints a formatted table with a title row.
# $data - the data to print (array of objects)
# $returnprops -json schema property description
# $props_to_print - ordered list of properties to print
# $options
# - sort_key: can be used to sort after a specific column, if it isn't set we sort
#   after the leftmost column. This can be turned off by passing 0 as sort_key
# - noborder: print without asciiart border
# - noheader: print without table header
# - columns: limit output width (if > 0)
# - utf8: use utf8 characters for table delimiters

sub print_text_table {
    my ($data, $returnprops, $props_to_print, $options, $terminal_opts) = @_;

    $terminal_opts //= query_terminal_options({});

    my $sort_key = $options->{sort_key};
    my $show_border = !$options->{noborder};
    my $show_header = !$options->{noheader};

    my $columns = $terminal_opts->{columns};
    my $utf8 = $terminal_opts->{utf8};
    my $encoding = $terminal_opts->{encoding} // 'UTF-8';

    $sort_key //= $props_to_print->[0];

    if (defined($sort_key) && $sort_key ne 0) {
        my $type = $returnprops->{$sort_key}->{type} // 'string';
        my $cmpfn;
        if ($type eq 'integer' || $type eq 'number') {
            $cmpfn = sub { $_[0] <=> $_[1] };
        } else {
            $cmpfn = sub { $_[0] cmp $_[1] };
        }
        @$data = sort {
            PVE::Tools::safe_compare($a->{$sort_key}, $b->{$sort_key}, $cmpfn)
        } @$data;
    }

    my $colopts = {};

    my $border = { m => '', b => '', t => '', h => '' };
    my $formatstring = '';

    my $column_count = scalar(@$props_to_print);

    my $tabledata = [];

    foreach my $entry (@$data) {

        my $height = 1;
        my $rowdata = {};

        for (my $i = 0; $i < $column_count; $i++) {
            my $prop = $props_to_print->[$i];
            my $propinfo = $returnprops->{$prop} // {};

            my $text = data_to_text($entry->{$prop}, $propinfo, $options, $terminal_opts);
            my $lines = [split(/\n/, $text)];
            my $linecount = scalar(@$lines);
            $height = $linecount if $linecount > $height;

            my $width = 0;
            foreach my $line (@$lines) {
                my $len = length($line);
                $width = $len if $len > $width;
            }

            $width = ($width =~ m/^(\d+)$/) ? int($1) : 0; # untaint int

            $rowdata->{$prop} = {
                lines => $lines,
                width => $width,
            };
        }

        push @$tabledata,
            {
                height => $height,
                rowdata => $rowdata,
            };
    }

    for (my $i = 0; $i < $column_count; $i++) {
        my $prop = $props_to_print->[$i];
        my $propinfo = $returnprops->{$prop} // {};
        my $type = $propinfo->{type} // 'string';
        my $alignstr = ($type eq 'integer' || $type eq 'number') ? '' : '-';

        my $title = $propinfo->{title} // $prop;
        my $cutoff = $propinfo->{print_width} // $propinfo->{maxLength};

        # calculate maximal print width and cutoff
        my $titlelen = length($title);

        my $longest = $titlelen;
        foreach my $coldata (@$tabledata) {
            my $rowdata = $coldata->{rowdata}->{$prop};
            $longest = $rowdata->{width} if $rowdata->{width} > $longest;
        }
        $cutoff = $longest if !defined($cutoff) || $cutoff > $longest;

        $colopts->{$prop} = {
            title => $title,
            cutoff => $cutoff,
        };

        if ($show_border) {
            if ($i == 0 && ($column_count == 1)) {
                if ($utf8) {
                    $formatstring .= "│ %$alignstr${cutoff}s │";
                    $border->{t} .= "┌─" . ('─' x $cutoff) . "─┐";
                    $border->{h} .= "╞═" . ('═' x $cutoff) . '═╡';
                    $border->{m} .= "├─" . ('─' x $cutoff) . "─┤";
                    $border->{b} .= "└─" . ('─' x $cutoff) . "─┘";
                } else {
                    $formatstring .= "| %$alignstr${cutoff}s |";
                    $border->{m} .= "+-" . ('-' x $cutoff) . "-+";
                    $border->{h} .= "+=" . ('=' x $cutoff) . '=';
                }
            } elsif ($i == 0) {
                if ($utf8) {
                    $formatstring .= "│ %$alignstr${cutoff}s ";
                    $border->{t} .= "┌─" . ('─' x $cutoff) . '─';
                    $border->{h} .= "╞═" . ('═' x $cutoff) . '═';
                    $border->{m} .= "├─" . ('─' x $cutoff) . '─';
                    $border->{b} .= "└─" . ('─' x $cutoff) . '─';
                } else {
                    $formatstring .= "| %$alignstr${cutoff}s ";
                    $border->{m} .= "+-" . ('-' x $cutoff) . '-';
                    $border->{h} .= "+=" . ('=' x $cutoff) . '=';
                }
            } elsif ($i == ($column_count - 1)) {
                if ($utf8) {
                    $formatstring .= "│ %$alignstr${cutoff}s │";
                    $border->{t} .= "┬─" . ('─' x $cutoff) . "─┐";
                    $border->{h} .= "╪═" . ('═' x $cutoff) . '═╡';
                    $border->{m} .= "┼─" . ('─' x $cutoff) . "─┤";
                    $border->{b} .= "┴─" . ('─' x $cutoff) . "─┘";
                } else {
                    $formatstring .= "| %$alignstr${cutoff}s |";
                    $border->{m} .= "+-" . ('-' x $cutoff) . "-+";
                    $border->{h} .= "+=" . ('=' x $cutoff) . "=+";
                }
            } else {
                if ($utf8) {
                    $formatstring .= "│ %$alignstr${cutoff}s ";
                    $border->{t} .= "┬─" . ('─' x $cutoff) . '─';
                    $border->{h} .= "╪═" . ('═' x $cutoff) . '═';
                    $border->{m} .= "┼─" . ('─' x $cutoff) . '─';
                    $border->{b} .= "┴─" . ('─' x $cutoff) . '─';
                } else {
                    $formatstring .= "| %$alignstr${cutoff}s ";
                    $border->{m} .= "+-" . ('-' x $cutoff) . '-';
                    $border->{h} .= "+=" . ('=' x $cutoff) . '=';
                }
            }
        } else {
            # skip alignment and cutoff on last column
            $formatstring .= ($i == ($column_count - 1)) ? "%s" : "%$alignstr${cutoff}s ";
        }
    }

    $border->{t} = $border->{m} if !length($border->{t});
    $border->{b} = $border->{m} if !length($border->{b});

    my $writeln = sub {
        my ($text) = @_;

        if ($columns) {
            print encode($encoding, substr($text, 0, $columns) . "\n");
        } else {
            print encode($encoding, $text) . "\n";
        }
    };

    $writeln->($border->{t}) if $show_border;

    if ($show_header) {
        my $text = sprintf $formatstring, map { $colopts->{$_}->{title} } @$props_to_print;
        $writeln->($text);
        $border->{sep} = $border->{h};
    } else {
        $border->{sep} = $border->{m};
    }

    for (my $i = 0; $i < scalar(@$tabledata); $i++) {
        my $coldata = $tabledata->[$i];

        if ($show_border && ($i != 0 || $show_header)) {
            $writeln->($border->{sep});
            $border->{sep} = $border->{m};
        }

        for (my $i = 0; $i < $coldata->{height}; $i++) {
            my $text = sprintf $formatstring, map {
                substr(
                    $coldata->{rowdata}->{$_}->{lines}->[$i] // '',
                    0,
                    $colopts->{$_}->{cutoff},
                );
            } @$props_to_print;

            $writeln->($text);
        }
    }

    $writeln->($border->{b}) if $show_border;
}

sub extract_properties_to_print {
    my ($propdef) = @_;

    my $required = [];
    my $optional = [];

    foreach my $key (keys %$propdef) {
        my $prop = $propdef->{$key};
        if ($prop->{optional}) {
            push @$optional, $key;
        } else {
            push @$required, $key;
        }
    }

    return [sort(@$required), sort(@$optional)];
}

# prints the result of an API GET call returning an array as a table.
# takes formatting information from the results property of the call
# if $props_to_print is provided, prints only those columns. otherwise
# takes all fields of the results property, with a fallback
# to all fields occurring in items of $data.
sub print_api_list {
    my ($data, $result_schema, $props_to_print, $options, $terminal_opts) = @_;

    die "can only print object lists\n"
        if !($result_schema->{type} eq 'array' && $result_schema->{items}->{type} eq 'object');

    my $returnprops = $result_schema->{items}->{properties};

    $props_to_print = extract_properties_to_print($returnprops)
        if !defined($props_to_print);

    if (!scalar(@$props_to_print)) {
        my $all_props = {};
        foreach my $obj (@$data) {
            foreach my $key (keys %$obj) {
                $all_props->{$key} = 1;
            }
        }
        $props_to_print = [sort keys %{$all_props}];
    }

    die "unable to detect list properties\n" if !scalar(@$props_to_print);

    print_text_table($data, $returnprops, $props_to_print, $options, $terminal_opts);
}

my $guess_type = sub {
    my $data = shift;

    return 'null' if !defined($data);

    my $class = ref($data);
    return 'string' if !$class;

    if ($class eq 'HASH') {
        return 'object';
    } elsif ($class eq 'ARRAY') {
        return 'array';
    } else {
        return 'string'; # better than nothing
    }
};

sub print_api_result {
    my ($data, $result_schema, $props_to_print, $options, $terminal_opts) = @_;

    return if $options->{quiet};

    $terminal_opts //= query_terminal_options({});

    my $format = $options->{'output-format'} // 'text';

    if ($result_schema && defined($result_schema->{type})) {
        return if $result_schema->{type} eq 'null';
        return if $result_schema->{optional} && !defined($data);
    } else {
        my $type = $guess_type->($data);
        $result_schema = { type => $type };
        $result_schema->{items} = { type => $guess_type->($data->[0]) } if $type eq 'array';
    }

    if ($format eq 'yaml') {
        print encode('UTF-8', YAML::XS::Dump($data));
    } elsif ($format eq 'json') {
        # Note: we always use utf8 encoding for json format
        print to_json($data, { utf8 => 1, allow_nonref => 1, canonical => 1 }) . "\n";
    } elsif ($format eq 'json-pretty') {
        # Note: we always use utf8 encoding for json format
        print to_json($data, { utf8 => 1, allow_nonref => 1, canonical => 1, pretty => 1 });
    } elsif ($format eq 'text') {
        my $encoding = $options->{encoding} // 'UTF-8';
        my $type = $result_schema->{type};
        if ($type eq 'object') {
            $props_to_print = extract_properties_to_print($result_schema->{properties})
                if !defined($props_to_print);
            $props_to_print = [sort keys %$data] if !scalar(@$props_to_print);
            my $kvstore = [];
            foreach my $key (@$props_to_print) {
                next if !defined($data->{$key});
                push @$kvstore,
                    {
                        key => $key,
                        value => data_to_text(
                            $data->{$key},
                            $result_schema->{properties}->{$key},
                            $options,
                            $terminal_opts,
                        ),
                    };
            }
            my $schema = { type => 'array', items => { type => 'object' } };
            print_api_list($kvstore, $schema, ['key', 'value'], $options, $terminal_opts);
        } elsif ($type eq 'array') {
            if (ref($data) eq 'ARRAY') {
                return if !scalar(@$data);
            } elsif (ref($data) eq 'HASH') {
                return if !scalar($data->%*);
                die "got hash object, but result schema specified array!\n";
            }
            my $item_type = $result_schema->{items}->{type};
            if ($item_type eq 'object') {
                print_api_list($data, $result_schema, $props_to_print, $options, $terminal_opts);
            } else {
                my $kvstore = [];
                foreach my $value (@$data) {
                    push @$kvstore, { value => $value };
                }
                my $schema = {
                    type => 'array',
                    items =>
                        { type => 'object', properties => { value => $result_schema->{items} } },
                };
                print_api_list(
                    $kvstore,
                    $schema,
                    ['value'],
                    { %$options, noheader => 1 },
                    $terminal_opts,
                );
            }
        } else {
            print encode($encoding, "$data\n");
        }
    } else {
        die "internal error: unknown output format"; # should not happen
    }
}

sub print_api_result_plain {
    my ($data, $result_schema, $props_to_print, $options) = @_;

    # avoid borders and header, ignore terminal width
    $options = $options ? {%$options} : {}; # copy

    $options->{noheader} //= 1;
    $options->{noborder} //= 1;

    print_api_result($data, $result_schema, $props_to_print, $options, {});
}

1;