<?php
/**
 * Namespaced per-form settings.
 *
 * @package ModelGainWebmcpForms
 */

namespace ModelGain\WordPress\WebmcpForms;

/**
 * Stores only explicit exposure choices in one option.
 */
final class Settings {
	const OPTION = 'modelgain_webmcp_forms_settings';

	/**
	 * Perform the documented operation.
	 *
	 * @return array<string,mixed>
	 */
	public function all() {
		$value = get_option( self::OPTION, array() );
		return is_array( $value ) ? $value : array();
	}

	/**
	 * Perform the documented operation.
	 *
	 * @param int $form_id Form ID.
	 * @return array<string,mixed>
	 */
	public function for_form( $form_id ) {
		$all     = $this->all();
		$forms   = isset( $all['forms'] ) && is_array( $all['forms'] ) ? $all['forms'] : array();
		$setting = isset( $forms[ absint( $form_id ) ] ) && is_array( $forms[ absint( $form_id ) ] ) ? $forms[ absint( $form_id ) ] : array();
		return array(
			'enabled'   => ! empty( $setting['enabled'] ),
			'tool_name' => ToolNaming::resolve( $form_id, isset( $setting['tool_name'] ) ? (string) $setting['tool_name'] : '' ),
		);
	}

	/**
	 * Perform the documented operation.
	 *
	 * @param int    $form_id Form ID.
	 * @param bool   $enabled Whether exposure is enabled.
	 * @param string $tool_name Optional custom name.
	 * @return bool
	 */
	public function save_form( $form_id, $enabled, $tool_name = '' ) {
		$all                      = $this->all();
		$all['forms']             = isset( $all['forms'] ) && is_array( $all['forms'] ) ? $all['forms'] : array();
		$form_id                  = absint( $form_id );
		$all['forms'][ $form_id ] = array(
			'enabled'   => (bool) $enabled,
			'tool_name' => ToolNaming::resolve( $form_id, sanitize_text_field( (string) $tool_name ) ),
		);
		return update_option( self::OPTION, $all, false );
	}

	/**
	 * Perform the documented operation.
	 *
	 * @param array<int,FormModel> $forms Discovered forms.
	 * @return array<int,array<string,mixed>>
	 */
	public function exposed_forms( array $forms ) {
		$exposed    = array();
		$candidates = array();
		$counts     = array();
		foreach ( $forms as $form ) {
			if ( $form->is_compatible() ) {
				$setting = $this->for_form( $form->id() );
				if ( ! empty( $setting['enabled'] ) ) {
					$candidates[]         = array(
						'form'     => $form,
						'settings' => $setting,
					);
					$tool_name            = $setting['tool_name'];
					$counts[ $tool_name ] = isset( $counts[ $tool_name ] ) ? $counts[ $tool_name ] + 1 : 1;
				}
			}
		}

		foreach ( $candidates as $candidate ) {
			$tool_name = $candidate['settings']['tool_name'];
			if ( 1 === $counts[ $tool_name ] ) {
				$exposed[] = $candidate;
			}
		}

		return $exposed;
	}

	/**
	 * Return enabled compatible forms whose resolved tool names collide.
	 *
	 * @param array<int,FormModel> $forms Discovered forms.
	 * @return array<int,string> Map of form ID to duplicated tool name.
	 */
	public function tool_name_conflicts( array $forms ) {
		$enabled = array();
		$counts  = array();
		foreach ( $forms as $form ) {
			if ( ! $form->is_compatible() ) {
				continue;
			}
			$setting = $this->for_form( $form->id() );
			if ( empty( $setting['enabled'] ) ) {
				continue;
			}
			$tool_name              = $setting['tool_name'];
			$enabled[ $form->id() ] = $tool_name;
			$counts[ $tool_name ]   = isset( $counts[ $tool_name ] ) ? $counts[ $tool_name ] + 1 : 1;
		}

		$conflicts = array();
		foreach ( $enabled as $form_id => $tool_name ) {
			if ( 1 < $counts[ $tool_name ] ) {
				$conflicts[ $form_id ] = $tool_name;
			}
		}
		return $conflicts;
	}
}