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package ACME::2026;

use 5.008003;
use strict;
use warnings;

use Carp qw(croak);
use Exporter 'import';
use File::Temp qw(tempfile);
use JSON::PP ();
use POSIX qw(strftime);

=head1 NAME

ACME::2026 - Checklists for glorious 2026 goals

=head1 VERSION

Version 0.01

=cut

our $VERSION = '0.01';

our @EXPORT_OK = qw(
  plan_new plan_load plan_save
  add_item update_item delete_item get_item
  add_note complete_item skip_item reopen_item
  items stats
);

our %EXPORT_TAGS = ( all => \@EXPORT_OK );

=head1 SYNOPSIS

  use ACME::2026 qw(:all);

  my $plan = plan_new(
    title => '2026',
    storage => '2026.json',
    autosave => 1,
  );

  my $id = add_item($plan, 'Run a marathon',
    list => 'Health',
    due => '2026-10-01',
    tags => [qw/fitness endurance/],
    priority => 2,
  );

  complete_item($plan, $id, note => 'Signed up for NYC');
  my @open = items($plan, status => 'todo', list => 'Health', sort => 'due');

  plan_save($plan);

=head1 DESCRIPTION

ACME::2026 is a tiny functional API for keeping 2026 checklists. It stores
plans as plain Perl hashrefs and can persist them to JSON.

=head1 DATA MODEL

Plan hashref:

  {
    title       => '2026',
    items       => [ ... ],
    next_id     => 1,
    created_at  => '2026-01-01T12:00:00Z',
    updated_at  => '2026-01-01T12:00:00Z',
    storage     => '2026.json',
    autosave    => 1,
  }

Item hashref:

  {
    id         => 1,
    title      => 'Run a marathon',
    status     => 'todo',
    list       => 'Health',
    tags       => ['fitness'],
    priority   => 2,
    due        => '2026-10-01',
    notes      => [ { note => 'Signed up', at => '2026-02-10T09:00:00Z' } ],
    created_at => '2026-01-01T12:00:00Z',
    updated_at => '2026-02-10T09:00:00Z',
  }

Status values are C<todo>, C<done>, or C<skipped>. Dates are ISO 8601 strings
(C<YYYY-MM-DD> or C<YYYY-MM-DDTHH:MM:SSZ>).

=head1 FUNCTIONS

=head2 plan_new

  my $plan = plan_new(%opts);

Creates a new plan hashref. Supported options:

  title    - plan title (default: 2026)
  storage  - JSON path used by plan_save and autosave
  autosave - boolean, save after mutating operations

=head2 plan_load

  my $plan = plan_load($path, %opts);

Loads a JSON file from C<$path>. The plan is normalized to ensure required
fields exist. You can override C<title> or C<autosave> with C<%opts>.

=head2 plan_save

  plan_save($plan);
  plan_save($plan, $path);

Writes the plan as JSON. Uses C<$plan-E<gt>{storage}> if no path is provided.

=head2 add_item

  my $id = add_item($plan, $title, %opts);

Adds an item and returns its id. Supported options:

  list, tags (arrayref or string), priority, due, note

=head2 update_item

  my $item = update_item($plan, $id, %attrs);

Updates a few fields in place: C<title>, C<list>, C<tags>, C<priority>, C<due>.
Use C<add_note> or the status helpers for notes and status changes.

=head2 delete_item

  my $item = delete_item($plan, $id);

Removes an item and returns it.

=head2 get_item

  my $item = get_item($plan, $id);

Returns the item or C<undef> if it does not exist.

=head2 add_note

  add_note($plan, $id, $note);

Appends a note with a timestamp.

=head2 complete_item

  complete_item($plan, $id, %opts);

Sets the status to C<done>. If C<note> is supplied, it is added.

=head2 skip_item

  skip_item($plan, $id, %opts);

Sets the status to C<skipped>. If C<note> is supplied, it is added.

=head2 reopen_item

  reopen_item($plan, $id, %opts);

Sets the status back to C<todo>. If C<note> is supplied, it is added.

=head2 items

  my @items = items($plan, %filters);

Filters items with any of:

  status, list, tag, tags, priority, min_priority, max_priority,
  due_before, due_after, sort

For C<tag> or C<tags>, any matching tag is enough. C<sort> supports:
C<due>, C<priority>, C<created>, C<updated>, or C<title>. Prefix with C<->
for descending order.

=head2 stats

  my $stats = stats($plan, %filters);

Returns a hashref with C<total>, C<todo>, C<done>, C<skipped>, and
C<complete_pct>.

=cut

sub plan_new {
    my %opts = _normalize_opts(@_);

    my $now = _now();
    my $plan = {
        title      => defined $opts{title} ? $opts{title} : '2026',
        items      => [],
        next_id    => 1,
        created_at => $now,
        updated_at => $now,
        storage    => $opts{storage},
        autosave   => $opts{autosave} ? 1 : 0,
    };

    return $plan;
}

sub plan_load {
    my ($path, %opts) = @_;
    croak 'plan_load requires a path' unless defined $path && length $path;

    my $json = _read_file($path);
    my $data = eval { JSON::PP->new->decode($json) };
    croak "Failed to decode JSON from $path: $@" if $@;

    _normalize_plan($data);

    $data->{storage} = $path;
    $data->{title} = $opts{title} if exists $opts{title};
    $data->{autosave} = $opts{autosave} ? 1 : 0 if exists $opts{autosave};

    return $data;
}

sub plan_save {
    my ($plan, $path) = @_;
    _ensure_plan($plan);

    $path ||= $plan->{storage};
    croak 'plan_save requires a path or plan storage' unless defined $path && length $path;

    _normalize_plan($plan);

    my $encoder = JSON::PP->new->canonical(1)->pretty(1);
    my $json = $encoder->encode($plan);
    _write_file_atomic($path, $json);

    return 1;
}

sub add_item {
    my ($plan, @args) = @_;
    _ensure_plan($plan);

    my ($title, %opts);
    if (@args % 2 == 1) {
        $title = shift @args;
        %opts = @args;
    } else {
        %opts = @args;
        $title = $opts{title};
    }

    croak 'add_item requires a title' unless defined $title && length $title;
    _reject_unknown('add_item', \%opts, qw(title list tags tag priority due note));

    my $now = _now();
    my $item = {
        id         => $plan->{next_id}++,
        title      => $title,
        status     => 'todo',
        list       => defined $opts{list} ? $opts{list} : 'General',
        tags       => _normalize_tags($opts{tags}, $opts{tag}),
        priority   => defined $opts{priority} ? $opts{priority} : 3,
        due        => $opts{due},
        notes      => [],
        created_at => $now,
        updated_at => $now,
    };

    push @{ $plan->{items} }, $item;
    if (defined $opts{note}) {
        _add_note($plan, $item, $opts{note});
    } else {
        _touch($plan);
    }
    _maybe_autosave($plan);

    return $item->{id};
}

sub update_item {
    my ($plan, $id, %attrs) = @_;
    _ensure_plan($plan);

    my $item = _find_item($plan, $id);
    croak "No item with id $id" unless $item;

    _reject_unknown('update_item', \%attrs, qw(title list tags tag priority due));

    my $changed = 0;
    for my $key (qw(title list priority due)) {
        next unless exists $attrs{$key};
        $item->{$key} = $attrs{$key};