<?php
namespace nulib\app\cli;

use nulib\cl;
use nulib\str;
use const true;

/**
 * Class Aodefs: une liste d'objets Aodef
 */
abstract class Aolist {
  function __construct(array $defs, bool $setup=true) {
    $this->origDefs = $defs;
    $this->initDefs($defs, $setup);
  }

  protected array $origDefs;

  protected ?array $aomain;
  protected ?array $aosections;
  protected ?array $aospecials;

  public ?Aodef $remainsArgdef = null;

  function initDefs(array $defs, bool $setup=true): void {
    $this->mergeParse($defs, $aobjects);
    $this->aomain = $aobjects["main"] ?? null;
    $this->aosections = $aobjects["sections"] ?? null;
    $this->aospecials = $aobjects["specials"] ?? null;
    if ($setup) $this->setup();
  }

  protected function mergeParse(array $defs, ?array &$aobjects, bool $parse=true): void {
    $aobjects ??= [];

    $merges = $defs["merges"] ?? null;
    $merge = $defs["merge"] ?? null;
    if ($merge !== null) $merges[] = $merge;
    if ($merges !== null) {
      foreach ($merges as $merge) {
        $this->mergeParse($merge, $aobjects, false);
        $this->parse($merge, $aobjects);
      }
    }

    if ($parse) $this->parse($defs, $aobjects);

    $merge = $defs["merge_after"] ?? null;
    if ($merge !== null) {
      $this->mergeParse($merge, $aobjects, false);
      $this->parse($merge, $aobjects);
    }
  }

  protected function parse(array $defs, array &$aobjects): void {
    [$defs, $params] = cl::split_assoc($defs);
    if ($defs !== null) {
      $aomain =& $aobjects["main"];
      foreach ($defs as $def) {
        $first = $def[0] ?? null;
        if ($first === "group") {
          $aobject = new Aogroup($def);
        } else {
          $aobject = new Aodef($def);
        }
        $aomain[] = $aobject;
      }
    }
    $sections = $params["sections"] ?? null;
    if ($sections !== null) {
      $aosections =& $aobjects["sections"];
      $index = 0;
      foreach ($sections as $key => $section) {
        if ($key === $index) {
          $index++;
          $aosections[] = new Aosection($section);
        } else {
          /** @var Aosection $aosection */
          $aosection = $aosections[$key] ?? null;
          if ($aosection === null) {
            $aosections[$key] = new Aosection($section);
          } else {
            #XXX il faut implémenter la fusion en cas de section existante
            # pour le moment, la liste existante est écrasée
            $aosection->initDefs($section);
          }
        }
      }
    }
    $this->parseParams($params);
  }

  protected function parseParams(?array $params): void {
  }

  function all(?array $what=null): iterable {
    $returnsAodef = $what["aodef"] ?? true;
    $returnsAolist = $what["aolist"] ?? false;
    $returnExtends = $what["extends"] ?? false;
    $withSpecials = $what["aospecials"] ?? true;
    # lister les sections avant, pour que les options de la section principale
    # soient prioritaires
    $aosections = $this->aosections;
    if ($aosections !== null) {
      /** @var Aosection $aobject */
      foreach ($aosections as $aosection) {
        if ($returnsAolist) {
          yield $aosection;
        } elseif ($returnsAodef) {
          yield from $aosection->all($what);
        }
      }
    }

    $aomain = $this->aomain;
    if ($aomain !== null) {
      /** @var Aodef $aobject */
      foreach ($aomain as $aobject) {
        if ($aobject instanceof Aodef) {
          if ($returnsAodef) {
            if ($returnExtends) {
              if ($aobject->isExtends()) yield $aobject;
            } else {
              if (!$aobject->isExtends()) yield $aobject;
            }
          }
        } elseif ($aobject instanceof Aolist) {
          if ($returnsAolist) {
            yield $aobject;
          } elseif ($returnsAodef) {
            yield from $aobject->all($what);
          }
        }
      }
    }

    $aospecials = $this->aospecials;
    if ($withSpecials && $aospecials !== null) {
      /** @var Aodef $aobject */
      foreach ($aospecials as $aobject) {
        yield $aobject;
      }
    }
  }

  protected function filter(callable $callback): void {
    $aomain = $this->aomain;
    if ($aomain !== null) {
      $filtered = [];
      /** @var Aodef $aobject */
      foreach ($aomain as $aobject) {
        if ($aobject instanceof Aolist) {
          $aobject->filter($callback);
        }
        if (call_user_func($callback, $aobject)) {
          $filtered[] = $aobject;
        }
      }
      $this->aomain = $filtered;
    }
    $aosections = $this->aosections;
    if ($aosections !== null) {
      $filtered = [];
      /** @var Aosection $aosection */
      foreach ($aosections as $aosection) {
        $aosection->filter($callback);
        if (call_user_func($callback, $aosection)) {
          $filtered[] = $aosection;
        }
      }
      $this->aosections = $filtered;
    }
  }

  protected function setup(): void {
    # calculer les options
    foreach ($this->all() as $aodef) {
      $aodef->setup1();
    }
    /** @var Aodef $aodef */
    foreach ($this->all(["extends" => true]) as $aodef) {
      $aodef->setup1(true, $this);
    }
    # ne garder que les objets non vides
    $this->filter(function($aobject): bool {
      if ($aobject instanceof Aodef) {
        return !$aobject->isEmpty();
      } elseif ($aobject instanceof Aolist) {
        return !$aobject->isEmpty();
      } else {
        return false;
      }
    });
    # puis calculer nombre d'arguments et actions
    foreach ($this->all() as $aodef) {
      $aodef->setup2();
    }
  }

  function isEmpty(): bool {
    foreach ($this->all() as $aobject) {
      return false;
    }
    return true;
  }

  function get(string $option): ?Aodef {
    return null;
  }

  function actionPrintHelp(string $arg): void {
    $this->printHelp([
      "show_all" => $arg === "--help++",
    ]);
  }

  function printHelp(?array $what=null): void {
    $show = $what["show_all"] ?? false;
    if (!$show) $show = null;

    $aosections = $this->aosections;
    if ($aosections !== null) {
      /** @var Aosection $aosection */
      foreach ($aosections as $aosection) {
        $aosection->printHelp(cl::merge($what, [
          "show" => $show,
          "prefix" => "\n",
        ]));
      }
    }

    $aomain = $this->aomain;
    if ($aomain !== null) {
      echo "\nOPTIONS\n";
      foreach ($aomain as $aobject) {
        $aobject->printHelp(cl::merge($what, [
          "show" => $show,
        ]));
      }
    }
  }

  function __toString(): string {
    $items = [];
    $what = [
      "aodef" => true,
      "aolist" => true,
    ];
    foreach ($this->all($what) as $aobject) {
      if ($aobject instanceof Aodef) {
        $items[] = strval($aobject);
      } elseif ($aobject instanceof Aogroup) {
        $items[] = implode("\n", [
          "group",
          str::indent(strval($aobject)),
        ]);
      } elseif ($aobject instanceof Aosection) {
        $items[] = implode("\n", [
          "section",
          str::indent(strval($aobject)),
        ]);
      } else {
        $items[] = false;
      }
    }
    return implode("\n", $items);
  }
}