<?php
namespace Tests\tripal_chado\api;

use StatonLab\TripalTestSuite\DBTransaction;
use StatonLab\TripalTestSuite\TripalTestCase;

module_load_include('inc', 'tripal_chado', 'api/ChadoSchema');

/**
 * Tests the current Chado Database is compliant with the schema definition used by Tripal
 */
class ChadoComplianceTest extends TripalTestCase {
  // Uncomment to auto start and rollback db transactions per test method.
  use DBTransaction;

  /**
   * DataProvider, a list of all chado tables.
   *
   * @return array
   */
  public function chadoTableProvider() {

    $chado_schema = new \ChadoSchema();
    $version = $chado_schema->getVersion();

    $dataset = [];
    foreach ($chado_schema->getTableNames() as $table_name) {
      $dataset[] = [$version, $table_name];
    }

    return $dataset;
  }

  /**
   * Tests Compliance for a given table.
   *
   * The following is tested:
   *   1. The table exists in the correct schema.
   *   2. It has all the fields we expect.
   *   3. Each field is the type we expect.
   *   4. It has all the constraints we expect.
   *   5. Each constraint consists of the columns we expect.
   *
   * @dataProvider chadoTableProvider
   *
   * @group api
   * @group chado
   * @group chado-compliance
   */
  public function testTableCompliance($schema_version, $table_name) {

    // Create the ChadoSchema class to aid in testing.
    $chado_schema = new \ChadoSchema();
    $version = $chado_schema->getVersion();
    $schema_name = $chado_schema->getSchemaName();

    // Check #1: The table exists in the correct schema.
    $this->assertTrue(
      $chado_schema->checkTableExists($table_name),
      t('"!table_name" should exist in the "!chado" schema v!version.',
        array('!table_name' => $table_name, '!chado' => $schema_name, '!version' => $version))
    );

    // Retrieve the schema for this table.
    $table_schema = $chado_schema->getTableSchema($table_name);

    // For each column in this table...
    foreach ($table_schema['fields'] as $column_name => $column_details) {

      // Check #2: The given field exists in the table.
      $this->assertTrue(
        $chado_schema->checkColumnExists($table_name, $column_name),
        t('The column "!column" must exist in "!table" for chado v!version.',
          array('!column' => $column_name, '!table' => $table_name, '!version' => $version))
      );

      // Check #3: The field is the type we expect.
      $this->assertTrue(
        $chado_schema->checkColumnType($table_name, $column_name, $column_details['type']),
        t('The column "!table.!column" must be of type "!type" for chado v!version.',
          array('!column' => $column_name, '!table' => $table_name,
            '!version' => $version, '!type' => $column_details['type']))
      );
    }

    // There are three types of constraints:
    // primary key, unique keys, and foreign keys.
    //.......................................

    // For the primary key:
    // Check #4: The constraint exists.
    if (isset($table_schema['primary key'][0]) AND !empty($table_schema['primary key'][0])) {
      $pkey_column = $table_schema['primary key'][0];
      $this->assertTrue(
        $chado_schema->checkPrimaryKey($table_name, $pkey_column),
        t('The column "!table.!column" must be a primary key with an associated sequence and constraint for chado v!version.',
          array('!column' => $pkey_column, '!table' => $table_name, '!version' => $version))
      );
    }

    // For each unique key:
    foreach ($table_schema['unique keys'] as $constraint_name => $columns) {
      // @debug print "Check '$constraint_name' for '$table_name': ".implode(', ', $columns).".\n";

      // Check #4: The constraint exists.
      $this->assertTrue(
        $chado_schema->checkConstraintExists($table_name, $constraint_name, 'UNIQUE'),
        t('The unique constraint "!name" for "!table" must exist for chado v!version.',
          array('!name' => $constraint_name, '!table' => $table_name, '!version' => $version))
      );

      // Check #5: The constraint consists of the columns we expect.
      // @todo
    }

    // For each foreign key:
    foreach ($table_schema['foreign keys'] as $fk_table => $details) {
      foreach ($details['columns'] as $base_column => $fk_column) {
        // @debug print "Check '$table_name.$base_column =>  $fk_table.$fk_column ' foreign key.";

        // Check #4: The constraint exists.
        $constraint_name = $table_name . '_' . $base_column . '_fkey';
        $this->assertTrue(
          $chado_schema->checkFKConstraintExists($table_name, $base_column),
          t('The foreign key constraint "!name" for "!table.!column" => "!fktable.!fkcolumn" must exist for chado v!version.',
            array('!name' => $constraint_name,
              '!table' => $table_name, '!column' => $base_column,
              '!fktable' => $fk_table, '!fkcolumn' => $fk_column,
              '!version' => $version))
        );

        // Check #5: The constraint consists of the columns we expect.
        // @todo
      }
    }
  }
}