<?php

/**
 * @file
 * Install hooks for Islandora Mirador Annotations.
 */

/**
 * Implements hook_schema().
 */
function islandora_mirador_annotations_schema() {
  $schema['islandora_mirador_annotation'] = [
    'description' => 'Stores IIIF Web Annotations created in Mirador.',
    'fields' => [
      'id' => [
        'type' => 'serial',
        'not null' => TRUE,
      ],
      'annotation_key' => [
        'type' => 'varchar',
        'length' => 64,
        'not null' => TRUE,
      ],
      'annotation_id' => [
        'type' => 'text',
        'size' => 'big',
        'not null' => TRUE,
      ],
      'canvas_key' => [
        'type' => 'varchar',
        'length' => 64,
        'not null' => TRUE,
      ],
      'canvas_id' => [
        'type' => 'text',
        'size' => 'big',
        'not null' => TRUE,
      ],
      'uid' => [
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'default' => 0,
      ],
      'annotation_json' => [
        'type' => 'blob',
        'size' => 'big',
        'not null' => TRUE,
      ],
      'created' => [
        'type' => 'int',
        'not null' => TRUE,
      ],
      'changed' => [
        'type' => 'int',
        'not null' => TRUE,
      ],
    ],
    'primary key' => ['id'],
    'unique keys' => [
      'annotation_key' => ['annotation_key'],
    ],
    'indexes' => [
      'canvas_key' => ['canvas_key'],
      'uid' => ['uid'],
    ],
  ];

  return $schema;
}

/**
 * Repair rows whose stored canvas differs from the Web Annotation target.
 */
function islandora_mirador_annotations_update_9001() {
  $database = \Drupal::database();
  $result = $database->select('islandora_mirador_annotation', 'a')
    ->fields('a', ['id', 'canvas_id', 'annotation_json'])
    ->execute();

  $updated = 0;
  foreach ($result as $row) {
    $annotation = json_decode((string) $row->annotation_json, TRUE);
    if (!is_array($annotation)) {
      continue;
    }

    $target = $annotation['target'] ?? NULL;
    $target_canvas_id = NULL;

    if (is_string($target)) {
      $target_canvas_id = explode('#', $target, 2)[0];
    }
    elseif (is_array($target)) {
      $source = $target['source'] ?? NULL;
      if (is_string($source)) {
        $target_canvas_id = explode('#', $source, 2)[0];
      }
      elseif (is_array($source)) {
        $value = $source['id'] ?? $source['@id'] ?? NULL;
        if (is_string($value)) {
          $target_canvas_id = explode('#', $value, 2)[0];
        }
      }

      if (!$target_canvas_id) {
        $value = $target['id'] ?? $target['@id'] ?? NULL;
        if (is_string($value)) {
          $target_canvas_id = explode('#', $value, 2)[0];
        }
      }
    }

    if (!$target_canvas_id || $target_canvas_id === $row->canvas_id) {
      continue;
    }

    $database->update('islandora_mirador_annotation')
      ->fields([
        'canvas_id' => $target_canvas_id,
        'canvas_key' => hash('sha256', $target_canvas_id),
      ])
      ->condition('id', $row->id)
      ->execute();
    $updated++;
  }

  return t('Re-associated @count Mirador annotation(s) with their target canvas.', [
    '@count' => $updated,
  ]);
}