#!/usr/bin/php
<?php
require $_composer_autoload_path?? __DIR__.'/../vendor/autoload.php';

use nur\b\io\CacheFile;
use nur\cli\Application;
use nur\msg;
use nur\path;
use nur\sery\db\Capacitor;
use nur\sery\db\CapacitorChannel;
use nur\sery\db\sqlite\SqliteStorage;
use nur\sery\file\Stream;
use nur\yaml;

Application::run(new class extends Application {
  const ACTION_QUERY = 0, ACTION_SQL = 1;

  const ARGS = [
    "merge" => parent::ARGS,
    "purpose" => "gestion d'un capacitor sqlite",
    "usage" => [
      "-f DBFILE -n CHANNEL [--query] key=value...",
      "-f DBFILE -n CHANNEL --sql-create",
    ],
    ["-f", "--dbfile", "args" => 1,
      "help" => "chemin vers la base de données",
    ],
    ["-n", "--name", "args" => 1,
      "help" => "nom du canal de données. table-name et channel-class sont chargés depuis la base de données",
    ],
    ["-t", "--table-name", "args" => 1,
      "help" => "nom de la table porteuse du canal de données",
    ],
    ["-c", "--channel-class", "args" => 1,
      "help" => "nom de la classe dérivée de CapacitorChannel",
    ],
    ["--query", "name" => "action", "value" => self::ACTION_QUERY,
      "help" => "lister les lignes correspondant aux valeurs spécifiées. c'est l'action par défaut",
    ],
    ["-s", "--sql-create", "name" => "action", "value" => self::ACTION_SQL,
      "help" => "afficher la requête pour créer la table",
    ],
  ];

  protected ?string $dbfile = null;

  protected ?string $name = null;

  protected ?string $tableName = null;

  protected ?string $channelClass = null;

  protected int $action = self::ACTION_QUERY;

  protected ?array $args = null;

  protected static function isa_cond(string $arg, ?array &$ms=null): bool {
    return preg_match('/^(.+?)\s*(=|<>|<|>|<=|>=|(?:is\s+)?null|(?:is\s+)?not\s+null)\s*(.*)$/', $arg, $ms);
  }

  function main() {
    $dbfile = $this->dbfile;
    if ($dbfile === null) self::die("Vous devez spécifier la base de données");
    if (!file_exists($dbfile)) self::die("$dbfile: fichier introuvable");
    $storage = new SqliteStorage($dbfile);
    $db = $storage->db();

    $haveChannels = $storage->tableExists("_channels");

    $name = $this->name;
    $channelClass = $this->channelClass;
    $tableName = $this->tableName;
    if ($name !== null) {
      $row = null;
      if ($haveChannels) {
        $row = $db->one([
          "select from _channels",
          "where" => ["name" => $name],
        ]);
      }
      if ($row === null) self::die("$name: nom de canal de données introuvable");
      if ($row["class"] !== "class@anonymous") $channelClass = $row["class"];
      else $tableName = $row["table_name"];
    }
    if ($channelClass !== null) {
      $channelClass = str_replace("/", "\\", $channelClass);
      $channel = new $channelClass;
    } elseif ($tableName !== null) {
      $channel = new class($tableName) extends CapacitorChannel {
        function __construct(?string $name=null) {
          parent::__construct($name);
          $this->tableName = $name;
        }
      };
    } else {
      $found = false;
      if ($haveChannels) {
        $rows = $db->all([
          "select from _channels",
        ]);
        foreach ($rows as $row) {
          msg::print($row["name"]);
          $found = true;
        }
      }
      if (!$found) self::die("Vous devez spécifier le canal de données");
    }
    $capacitor = new Capacitor($storage, $channel);

    switch ($this->action) {
    case self::ACTION_QUERY:
      $args = $this->args;
      var_export($args); #XXX
      if (!$args) {
        # lister les id
        $out = new Stream(STDOUT);
        $primaryKeys = $storage->getPrimaryKeys($channel);
        var_export($primaryKeys); #XXX
        $rows = $db->all([
          "select",
          "cols" => $primaryKeys,
          "from" => $channel->getTableName(),
        ]);
        $out->fputcsv($primaryKeys);
        foreach ($rows as $row) {
          $rowIds = $storage->getRowIds($channel, $row);
          $out->fputcsv($rowIds);
        }
      } else {
        # afficher les lignes correspondantes
        if (count($args) == 1 && !self::isa_cond($args[0])) {
          $filter = $args[0];
        } else {
          $filter = [];
          $ms = null;
          foreach ($args as $arg) {
            if (self::isa_cond($arg, $ms)) {
              $filter[$ms[1]] = [$ms[2], $ms[3]];
            } else {
              $filter[$arg] = ["not null"];
            }
          }
        }
        $first = true;
        $capacitor->each($filter, function ($item, $row) use (&$first) {
          if ($first) $first = false;
          else echo "---\n";
          yaml::dump($row);
        });
      }
      break;
    case self::ACTION_SQL:
      echo $capacitor->getCreateSql()."\n";
      break;
    }
  }
});