<?php
/**
 * Central zone dispatch for read, write, delete, and module-name resolution.
 *
 * Previously, `'hot_' . sanitize_key($post_type)` was repeated across the REST
 * API, Query Router, migrations, and Sync Bridge.  Moving the canonical form
 * here gives all callers a single place to look and lets the three dispatch
 * methods be tested without setting up hook infrastructure.
 *
 * @package TMDO
 * @since 0.2.0
 */

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

/**
 * Central zone dispatch for read, write, delete, and module-name resolution.
 */
class TMDO_Zone_Router {

	/**
	 * Returns the Feature Flags module name for a zone + post_type pair.
	 *
	 * @param string $zone      Zone identifier: 'hot', 'cold', 'warm', 'archive'.
	 * @param string $post_type Post type slug.
	 * @return string Module name suitable for TMDO_Feature_Flags::is_*().
	 */
	public static function module_name( string $zone, string $post_type ): string {
		return match ( $zone ) {
			'hot'     => 'hot_' . sanitize_key( $post_type ),
			'cold'    => 'cold_' . sanitize_key( $post_type ),
			'warm'    => 'warm',
			'archive' => 'archive',
			default   => 'unknown',
		};
	}

	/**
	 * Read a field value from the appropriate zone.
	 *
	 * @param array  $field     Field definition from Schema Registry.
	 * @param int    $post_id   Post ID.
	 * @param string $post_type Post type.
	 * @param string $meta_key  Meta key.
	 * @return mixed Value from zone, or null if not found / zone not supported.
	 */
	public static function read( array $field, int $post_id, string $post_type, string $meta_key ): mixed {
		return match ( $field['zone'] ) {
			'hot'   => TMDO_Zone_Hot::get( $post_id, $post_type, $field['column'] ),
			'cold'  => TMDO_Zone_Cold::get( $post_id, $post_type, $meta_key ),
			'warm'  => TMDO_Zone_Warm::get( $post_id, $meta_key ),
			default => null,
		};
	}

	/**
	 * Write a field value to the appropriate zone.
	 *
	 * @param array  $field     Field definition from Schema Registry.
	 * @param int    $post_id   Post ID.
	 * @param string $post_type Post type.
	 * @param string $meta_key  Meta key.
	 * @param mixed  $value     Value to write.
	 * @return void
	 */
	public static function write( array $field, int $post_id, string $post_type, string $meta_key, mixed $value ): void {
		match ( $field['zone'] ) {
			'hot'   => TMDO_Zone_Hot::set( $post_id, $post_type, $field['column'], $value ),
			'cold'  => TMDO_Zone_Cold::set( $post_id, $post_type, $meta_key, $value ),
			'warm'  => TMDO_Zone_Warm::set(
				$post_id,
				$meta_key,
				is_string( $value ) ? $value : wp_json_encode( $value ),
				$field['ttl'] ?? null
			),
			default => null,
		};
	}

	/**
	 * Delete a single field value from the appropriate zone.
	 *
	 * @param array  $field     Field definition from Schema Registry.
	 * @param int    $post_id   Post ID.
	 * @param string $post_type Post type.
	 * @param string $meta_key  Meta key.
	 * @return void
	 */
	public static function delete_field( array $field, int $post_id, string $post_type, string $meta_key ): void {
		match ( $field['zone'] ) {
			'hot'   => TMDO_Zone_Hot::set( $post_id, $post_type, $field['column'], null ),
			'cold'  => TMDO_Zone_Cold::remove( $post_id, $post_type, $meta_key ),
			'warm'  => TMDO_Zone_Warm::delete( $post_id, $meta_key ),
			default => null,
		};
	}

	/**
	 * Delete all Zone data for a post being permanently removed.
	 *
	 * Callers only need post_id and post_type; zone enumeration and per-zone
	 * error isolation are handled here. Hot and Cold are skipped when the
	 * post_type has no registered fields in that zone (table may not exist).
	 *
	 * @param int    $post_id   Post ID being deleted.
	 * @param string $post_type Post type slug.
	 * @return void
	 */
	public static function delete_post( int $post_id, string $post_type ): void {
		$registry = TMDO_Schema_Registry::instance();

		if ( ! empty( $registry->get_hot_columns( $post_type ) ) ) {
			try {
				TMDO_Zone_Hot::delete( $post_id, $post_type );
			} catch ( \Throwable $e ) {
				TMDO_Logger::error( 'hot_' . $post_type, 'delete_post', $e->getMessage() );
			}
		}

		if ( ! empty( $registry->get_cold_meta_keys( $post_type ) ) ) {
			try {
				TMDO_Zone_Cold::delete( $post_id, $post_type );
			} catch ( \Throwable $e ) {
				TMDO_Logger::error( 'cold_' . $post_type, 'delete_post', $e->getMessage() );
			}
		}

		try {
			TMDO_Zone_Warm::delete_all( $post_id );
		} catch ( \Throwable $e ) {
			TMDO_Logger::error( 'warm', 'delete_post', $e->getMessage() );
		}

		try {
			TMDO_Zone_Archive::delete( $post_id );
		} catch ( \Throwable $e ) {
			TMDO_Logger::error( 'archive', 'delete_post', $e->getMessage() );
		}
	}
}