Proyectos de Subversion Moodle

<?php

// This file is part of Moodle - http://moodle.org/

//

// Moodle is free software: you can redistribute it and/or modify

// it under the terms of the GNU General Public License as published by

// the Free Software Foundation, either version 3 of the License, or

// (at your option) any later version.

//

// Moodle is distributed in the hope that it will be useful,

// but WITHOUT ANY WARRANTY; without even the implied warranty of

// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

// GNU General Public License for more details.

//

// You should have received a copy of the GNU General Public License

// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

declare(strict_types=1);

namespace core_reportbuilder\local\report;

use coding_exception;

use context;

use lang_string;

use core_reportbuilder\local\entities\base as entity_base;

use core_reportbuilder\local\filters\base as filter_base;

use core_reportbuilder\local\helpers\database;

use core_reportbuilder\local\helpers\user_filter_manager;

use core_reportbuilder\local\models\report;

/**

 * Base class for all reports

 *

 * @package     core_reportbuilder

 * @copyright   2020 Paul Holden <paulh@moodle.com>

 * @license     http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later

 */

abstract class base {

    /** @var int Custom report type value */

    public const TYPE_CUSTOM_REPORT = 0;

    /** @var int System report type value */

    public const TYPE_SYSTEM_REPORT = 1;

    /** @var int Default paging limit */

    public const DEFAULT_PAGESIZE = 30;

    /** @var report $report Report persistent */

    private $report;

    /** @var string $maintable */

    private $maintable = '';

    /** @var string $maintablealias */

    private $maintablealias = '';

    /** @var array $sqljoins */

    private $sqljoins = [];

    /** @var array $sqlwheres */

    private $sqlwheres = [];

    /** @var array $sqlparams */

    private $sqlparams = [];

    /** @var entity_base[] $entities */

    private $entities = [];

    /** @var lang_string[] */

    private $entitytitles = [];

    /** @var column[] $columns */

    private $columns = [];

    /** @var filter[] $conditions */

    private $conditions = [];

    /** @var filter[] $filters */

    private $filters = [];

    /** @var bool $downloadable Set if the report can be downloaded */

    private $downloadable = false;

    /** @var string $downloadfilename Name of the downloaded file */

    private $downloadfilename = '';

    /** @var int Default paging size */

    private $defaultperpage = self::DEFAULT_PAGESIZE;

    /** @var array $attributes */

    private $attributes = [];

    /** @var lang_string $noresultsnotice */

    private $noresultsnotice;

    /**

     * Base report constructor

     *

     * @param report $report

     */

    public function __construct(report $report) {

        $this->report = $report;

        $this->noresultsnotice = new lang_string('nothingtodisplay');

        // Initialise and validate the report.

        $this->initialise();

        $this->validate();

    }

    /**

     * Returns persistent class used when initialising this report

     *

     * @return report

     */

    final public function get_report_persistent(): report {

        return $this->report;

    }

    /**

     * Return user friendly name of the report

     *

     * @return string

     */

    abstract public static function get_name(): string;

    /**

     * Initialise report. Specify which columns, filters, etc should be present

     *

     * To set the base query use:

     * - {@see set_main_table}

     * - {@see add_base_condition_simple} or {@see add_base_condition_sql}

     * - {@see add_join}

     *

     * To add content to the report use:

     * - {@see add_entity}

     * - {@see add_column}

     * - {@see add_filter}

     * - etc

     */

    abstract protected function initialise(): void;

    /**

     * Get the report availability. Sub-classes should override this method to declare themselves unavailable, for example if

     * they require classes that aren't present due to missing plugin

     *

     * @return bool

     */

    public static function is_available(): bool {

        return true;

    }

    /**

     * Perform some basic validation about expected class properties

     *

     * @throws coding_exception

     */

    protected function validate(): void {

        if (empty($this->maintable)) {

            throw new coding_exception('Report must define main table by calling $this->set_main_table()');

        }

        if (empty($this->columns)) {

            throw new coding_exception('Report must define at least one column by calling $this->add_column()');

        }

    }

    /**

     * Set the main table and alias for the SQL query

     *

     * @param string $tablename

     * @param string $tablealias

     */

    final public function set_main_table(string $tablename, string $tablealias = ''): void {

        $this->maintable = $tablename;

        $this->maintablealias = $tablealias;

    }

    /**

     * Get the main table name

     *

     * @return string

     */

    final public function get_main_table(): string {

        return $this->maintable;

    }

    /**

     * Get the alias for the main table

     *

     * @return string

     */

    final public function get_main_table_alias(): string {

        return $this->maintablealias;

    }

    /**

     * Adds report JOIN clause that is always added

     *

     * @param string $join

     * @param array $params

     * @param bool $validateparams Some queries might add non-standard params and validation could fail

     */

    protected function add_join(string $join, array $params = [], bool $validateparams = true): void {

        if ($validateparams) {

            database::validate_params($params);

        }

        $this->sqljoins[trim($join)] = trim($join);

        $this->sqlparams += $params;

    }

    /**

     * Return report JOIN clauses

     *

     * @return array

     */

    public function get_joins(): array {

        return array_values($this->sqljoins);

    }

    /**

     * Define simple "field = value" clause to apply to the report query

     *

     * @param string $fieldname

     * @param mixed $fieldvalue

     */

    final public function add_base_condition_simple(string $fieldname, $fieldvalue): void {

        if ($fieldvalue === null) {

            $this->add_base_condition_sql("{$fieldname} IS NULL");

        } else {

            $fieldvalueparam = database::generate_param_name();

            $this->add_base_condition_sql("{$fieldname} = :{$fieldvalueparam}", [

                $fieldvalueparam => $fieldvalue,

            ]);

        }

    }

    /**

     * Define more complex/non-empty clause to apply to the report query

     *

     * @param string $where

     * @param array $params Note that the param names should be generated by {@see database::generate_param_name}

     */

    final public function add_base_condition_sql(string $where, array $params = []): void {

        // Validate parameters always, so that potential errors are caught early.

        database::validate_params($params);

        if ($where !== '') {

            $this->sqlwheres[] = trim($where);

            $this->sqlparams = $params + $this->sqlparams;

        }

    }

    /**

     * Return base select/params for the report query

     *

     * @return array [string $select, array $params]

     */

    final public function get_base_condition(): array {

        return [

            implode(' AND ', $this->sqlwheres),

            $this->sqlparams,

        ];

    }

    /**

     * Adds given entity, along with it's columns and filters, to the report

     *

     * @param entity_base $entity

     */

    final protected function add_entity(entity_base $entity): void {

        $entityname = $entity->get_entity_name();

        $this->annotate_entity($entityname, $entity->get_entity_title());

        $this->entities[$entityname] = $entity->initialise();

    }

    /**

     * Returns the entity added to the report from the given entity name

     *

     * @param string $name

     * @return entity_base

     * @throws coding_exception

     */

    final protected function get_entity(string $name): entity_base {

        if (!array_key_exists($name, $this->entities)) {

            throw new coding_exception('Invalid entity name', $name);

        }

        return $this->entities[$name];

    }

    /**

     * Returns the list of all the entities added to the report

     *

     * @return entity_base[]

     */

    final protected function get_entities(): array {

        return $this->entities;

    }

    /**

     * Define a new entity for the report

     *

     * @param string $name

     * @param lang_string $title

     * @throws coding_exception

     */

    final protected function annotate_entity(string $name, lang_string $title): void {

        if ($name === '' || $name !== clean_param($name, PARAM_ALPHANUMEXT)) {

            throw new coding_exception('Entity name must be comprised of alphanumeric character, underscore or dash');

        }

        if (array_key_exists($name, $this->entitytitles)) {

            throw new coding_exception('Duplicate entity name', $name);

        }

        $this->entitytitles[$name] = $title;

    }

    /**

     * Returns title of given report entity

     *

     * @param string $name

     * @return lang_string

     * @throws coding_exception

     */

    final public function get_entity_title(string $name): lang_string {

        if (!array_key_exists($name, $this->entitytitles)) {

            throw new coding_exception('Invalid entity name', $name);

        }

        return $this->entitytitles[$name];

    }

    /**

     * Adds a column to the report

     *

     * @param column $column

     * @return column

     * @throws coding_exception

     */

    final protected function add_column(column $column): column {

        if (!array_key_exists($column->get_entity_name(), $this->entitytitles)) {

            throw new coding_exception('Invalid entity name', $column->get_entity_name());

        }

        $name = $column->get_name();

        if (empty($name) || $name !== clean_param($name, PARAM_ALPHANUMEXT)) {

            throw new coding_exception('Column name must be comprised of alphanumeric character, underscore or dash');

        }

        $uniqueidentifier = $column->get_unique_identifier();

        if (array_key_exists($uniqueidentifier, $this->columns)) {

            throw new coding_exception('Duplicate column identifier', $uniqueidentifier);

        }

        $this->columns[$uniqueidentifier] = $column;

        return $column;

    }

    /**

     * Add given column to the report from an entity

     *

     * The entity must have already been added to the report before calling this method

     *

     * @param string $uniqueidentifier

     * @return column

     */

    final protected function add_column_from_entity(string $uniqueidentifier): column {

        [$entityname, $columnname] = explode(':', $uniqueidentifier, 2);

        return $this->add_column($this->get_entity($entityname)->get_column($columnname));

    }

    /**

     * Add given columns to the report from one or more entities

     *

     * Each entity must have already been added to the report before calling this method

     *

     * @param string[] $columns Unique identifier of each entity column

     */

    final protected function add_columns_from_entities(array $columns): void {

        foreach ($columns as $column) {

            $this->add_column_from_entity($column);

        }

    }

    /**

     * Return report column by unique identifier

     *

     * @param string $uniqueidentifier

     * @return column|null

     */

    final public function get_column(string $uniqueidentifier): ?column {

        return $this->columns[$uniqueidentifier] ?? null;

    }

    /**

     * Return all available report columns

     *

     * @return column[]

     */

    final public function get_columns(): array {

        return array_filter($this->columns, static function(column $column): bool {

            return $column->get_is_available();

        });

    }

    /**

     * Return all active report columns (by default, all available columns)

     *

     * @return column[]

     */

    public function get_active_columns(): array {

        $columns = $this->get_columns();

        foreach ($columns as $column) {

            if ($column->get_is_deprecated()) {

                debugging("The column '{$column->get_unique_identifier()}' is deprecated, please do not use it any more." .

                    " {$column->get_is_deprecated_message()}", DEBUG_DEVELOPER);

            }

        }

        return $columns;

    }

    /**

     * Return all active report columns, keyed by their alias (only active columns in a report would have a valid alias/index)

     *

     * @return column[]

     */

    final public function get_active_columns_by_alias(): array {

        $columns = [];

        foreach ($this->get_active_columns() as $column) {

            $columns[$column->get_column_alias()] = $column;

        }

        return $columns;

    }

    /**

     * Adds a condition to the report

     *

     * @param filter $condition

     * @return filter

     * @throws coding_exception

     */

    final protected function add_condition(filter $condition): filter {

        if (!array_key_exists($condition->get_entity_name(), $this->entitytitles)) {

            throw new coding_exception('Invalid entity name', $condition->get_entity_name());

        }

        $name = $condition->get_name();

        if (empty($name) || $name !== clean_param($name, PARAM_ALPHANUMEXT)) {

            throw new coding_exception('Condition name must be comprised of alphanumeric character, underscore or dash');

        }

        $uniqueidentifier = $condition->get_unique_identifier();

        if (array_key_exists($uniqueidentifier, $this->conditions)) {

            throw new coding_exception('Duplicate condition identifier', $uniqueidentifier);

        }

        $this->conditions[$uniqueidentifier] = $condition;

        return $condition;

    }

    /**

     * Add given condition to the report from an entity

     *

     * The entity must have already been added to the report before calling this method

     *

     * @param string $uniqueidentifier

     * @return filter

     */

    final protected function add_condition_from_entity(string $uniqueidentifier): filter {

        [$entityname, $conditionname] = explode(':', $uniqueidentifier, 2);

        return $this->add_condition($this->get_entity($entityname)->get_condition($conditionname));

    }

    /**

     * Add given conditions to the report from one or more entities

     *

     * Each entity must have already been added to the report before calling this method

     *

     * @param string[] $conditions Unique identifier of each entity condition

     */

    final protected function add_conditions_from_entities(array $conditions): void {

        foreach ($conditions as $condition) {

            $this->add_condition_from_entity($condition);

        }

    }

    /**

     * Return report condition by unique identifier

     *

     * @param string $uniqueidentifier

     * @return filter|null

     */

    final public function get_condition(string $uniqueidentifier): ?filter {

        return $this->conditions[$uniqueidentifier] ?? null;

    }

    /**

     * Return all available report conditions

     *

     * @return filter[]

     */

    final public function get_conditions(): array {

        return array_filter($this->conditions, static function(filter $condition): bool {

            return $condition->get_is_available();

        });

    }

    /**

     * Return all active report conditions (by default, all available conditions)

     *

     * @return filter[]

     */

    public function get_active_conditions(): array {

        $conditions = $this->get_conditions();

        foreach ($conditions as $condition) {

            if ($condition->get_is_deprecated()) {

                debugging("The condition '{$condition->get_unique_identifier()}' is deprecated, please do not use it any more." .

                    " {$condition->get_is_deprecated_message()}", DEBUG_DEVELOPER);

            }

        }

        return $conditions;

    }

    /**

     * Return all active report condition instances

     *

     * @return filter_base[]

     */

    final public function get_condition_instances(): array {

        return array_map(static function(filter $condition): filter_base {

            /** @var filter_base $conditionclass */

            $conditionclass = $condition->get_filter_class();

            return $conditionclass::create($condition);

        }, $this->get_active_conditions());

    }

    /**

     * Set the condition values of the report

     *

     * @param array $values

     * @return bool

     */

    final public function set_condition_values(array $values): bool {

        $this->report->set('conditiondata', json_encode($values))

            ->save();

        return true;

    }

    /**

     * Get the condition values of the report

     *

     * @return array

     */

    final public function get_condition_values(): array {

        $conditions = (string) $this->report->get('conditiondata');

        return (array) json_decode($conditions);

    }

    /**

     * Set the settings values of the report

     *

     * @param array $values

     * @return bool

     */

    final public function set_settings_values(array $values): bool {

        $currentsettings = $this->get_settings_values();

        $settings = array_merge($currentsettings, $values);

        $this->report->set('settingsdata', json_encode($settings))

            ->save();

        return true;

    }

    /**

     * Get the settings values of the report

     *

     * @return array

     */

    final public function get_settings_values(): array {

        $settings = (string) $this->report->get('settingsdata');

        return (array) json_decode($settings);

    }

    /**

     * Adds a filter to the report

     *

     * @param filter $filter

     * @return filter

     * @throws coding_exception

     */

    final protected function add_filter(filter $filter): filter {

        if (!array_key_exists($filter->get_entity_name(), $this->entitytitles)) {

            throw new coding_exception('Invalid entity name', $filter->get_entity_name());

        }

        $name = $filter->get_name();

        if (empty($name) || $name !== clean_param($name, PARAM_ALPHANUMEXT)) {

            throw new coding_exception('Filter name must be comprised of alphanumeric character, underscore or dash');

        }

        $uniqueidentifier = $filter->get_unique_identifier();

        if (array_key_exists($uniqueidentifier, $this->filters)) {

            throw new coding_exception('Duplicate filter identifier', $uniqueidentifier);

        }

        $this->filters[$uniqueidentifier] = $filter;

        return $filter;

    }

    /**

     * Add given filter to the report from an entity

     *

     * The entity must have already been added to the report before calling this method

     *

     * @param string $uniqueidentifier

     * @return filter

     */

    final protected function add_filter_from_entity(string $uniqueidentifier): filter {

        [$entityname, $filtername] = explode(':', $uniqueidentifier, 2);

        return $this->add_filter($this->get_entity($entityname)->get_filter($filtername));

    }

    /**

     * Add given filters to the report from one or more entities

     *

     * Each entity must have already been added to the report before calling this method

     *

     * @param string[] $filters Unique identifier of each entity filter

     */

    final protected function add_filters_from_entities(array $filters): void {

        foreach ($filters as $filter) {

            $this->add_filter_from_entity($filter);

        }

    }

    /**

     * Return report filter by unique identifier

     *

     * @param string $uniqueidentifier

     * @return filter|null

     */

    final public function get_filter(string $uniqueidentifier): ?filter {

        return $this->filters[$uniqueidentifier] ?? null;

    }

    /**

     * Return all available report filters

     *

     * @return filter[]

     */

    final public function get_filters(): array {

        return array_filter($this->filters, static function(filter $filter): bool {

            return $filter->get_is_available();

        });

    }

    /**

     * Return all active report filters (by default, all available filters)

     *

     * @return filter[]

     */

    public function get_active_filters(): array {

        $filters = $this->get_filters();

        foreach ($filters as $filter) {

            if ($filter->get_is_deprecated()) {

                debugging("The filter '{$filter->get_unique_identifier()}' is deprecated, please do not use it any more." .

                    " {$filter->get_is_deprecated_message()}", DEBUG_DEVELOPER);

            }

        }

        return $filters;

    }

    /**

     * Return all active report filter instances

     *

     * @return filter_base[]

     */

    final public function get_filter_instances(): array {

        return array_map(static function(filter $filter): filter_base {

            /** @var filter_base $filterclass */

            $filterclass = $filter->get_filter_class();

            return $filterclass::create($filter);

        }, $this->get_active_filters());

    }

    /**

     * Set the filter values of the report

     *

     * @param array $values

     * @return bool

     */

    final public function set_filter_values(array $values): bool {

        return user_filter_manager::set($this->report->get('id'), $values);

    }

    /**

     * Get the filter values of the report

     *

     * @return array

     */

    final public function get_filter_values(): array {

        return user_filter_manager::get($this->report->get('id'));

    }

    /**

     * Return the number of filter instances that are being applied based on the report's filter values (i.e. user has

     * configured them from their initial "Any value" state)

     *

     * @return int

     */

    final public function get_applied_filter_count(): int {

        $values = $this->get_filter_values();

        $applied = array_filter($this->get_filter_instances(), static function(filter_base $filter) use ($values): bool {

            return $filter->applies_to_values($values);

        });

        return count($applied);

    }

    /**

     * Set if the report can be downloaded.

     *

     * @param bool $downloadable

     * @param string|null $downloadfilename If downloadable, then the name of the file (defaults to the name of the current report)

     */

    final public function set_downloadable(bool $downloadable, ?string $downloadfilename = null): void {

        $this->downloadable = $downloadable;

        $this->downloadfilename = $downloadfilename ?? static::get_name();

    }

    /**

     * Get if the report can be downloaded.

     *

     * @return bool

     */

    final public function is_downloadable(): bool {

        return $this->downloadable;

    }

    /**

     * Return the downloadable report filename

     *

     * @return string

     */

    final public function get_downloadfilename(): string {

        return $this->downloadfilename;

    }

    /**

     * Returns the report context

     *

     * @return context

     */

    public function get_context(): context {

        return $this->report->get_context();

    }

    /**

     * Set the default 'per page' size

     *

     * @param int $defaultperpage

     */

    public function set_default_per_page(int $defaultperpage): void {

        $this->defaultperpage = $defaultperpage;

    }

    /**

     * Set the default lang string for the notice used when no results are found.

     *

     * @param lang_string|null $notice string, or null to tell the report to omit the notice entirely.

     * @return void

     */

    public function set_default_no_results_notice(?lang_string $notice): void {

        $this->noresultsnotice = $notice;

    }

    /**

     * Get the default lang string for the notice used when no results are found.

     *

     * @return lang_string|null the lang_string instance or null if the report prefers not to use one.

     */

    public function get_default_no_results_notice(): ?lang_string {

        return $this->noresultsnotice;

    }

    /**

     * Default 'per page' size

     *

     * @return int

     */

    public function get_default_per_page(): int {

        return $this->defaultperpage;

    }

    /**

     * Add report attributes (data-, class, etc.) that will be included in HTML when report is displayed

     *

     * @param array $attributes

     * @return self

     */

    public function add_attributes(array $attributes): self {

        $this->attributes = $attributes + $this->attributes;

        return $this;

    }

    /**

     * Returns the report HTML attributes

     *

     * @return array

     */

    public function get_attributes(): array {

        return $this->attributes;

    }

}