<?php

namespace Monei\Services;

class ApiKeyService {
	private string $test_api_key;
	private string $live_api_key;
	private string $api_key_mode;
	private string $test_account_id;
	private string $live_account_id;


	public function __construct() {
		// Load the API keys and mode from the database
		$this->test_api_key    = get_option( 'monei_test_apikey', '' );
		$this->live_api_key    = get_option( 'monei_live_apikey', '' );
		$this->api_key_mode    = get_option( 'monei_apikey_mode', 'test' );
		$this->test_account_id = get_option( 'monei_test_accountid', '' );
		$this->live_account_id = get_option( 'monei_live_accountid', '' );

		// Copy the API keys to the central settings when the plugin is activated or updated
		add_action( 'init', array( $this, 'copyKeysToCentralSettings' ), 0 );
	}

	/**
	 * Get the appropriate API key based on the selected mode.
	 *
	 * @return string
	 */
	public function get_api_key(): string {
		return ( $this->api_key_mode === 'test' ) ? $this->test_api_key : $this->live_api_key;
	}

	/**
	 * Get the selected API key mode.
	 *
	 * @return bool
	 */
	public function is_test_mode(): bool {
		return $this->api_key_mode === 'test';
	}

	/**
	 * Get the account id.
	 *
	 * @return string
	 */
	public function get_account_id(): string {
		return ( $this->api_key_mode === 'test' ) ? $this->test_account_id : $this->live_account_id;
	}

	/**
	 * Update the API keys and mode in the service.
	 * This can be called whenever the database is updated.
	 */
	public function update_keys(): void {
		$this->test_api_key    = get_option( 'monei_test_apikey', '' );
		$this->live_api_key    = get_option( 'monei_live_apikey', '' );
		$this->test_account_id = get_option( 'monei_test_accountid', '' );
		$this->live_account_id = get_option( 'monei_live_accountid', '' );
		$this->api_key_mode    = get_option( 'monei_apikey_mode', 'test' );
	}

	public function copyKeysToCentralSettings() {
		// Get the current state once
		$keyState = $this->getCurrentKeyState();

		// First, check if we need any migration at all
		if ( $this->needsMigration( $keyState ) ) {
			// Try standalone migration first (has priority)
			$standaloneSuccess = $this->migrateStandaloneKeys( $keyState );

			// Only bother with settings if standalone migration didn't complete everything
			if ( ! $standaloneSuccess ) {
				add_filter( 'option_woocommerce_monei_settings', array( $this, 'processCentralSettings' ), 10, 1 );
			}
		}
	}

	/**
	 * Get current state of all keys
	 *
	 * @return array Current key state
	 */
	private function getCurrentKeyState() {
		return array(
			'test_api_key'    => get_option( 'monei_test_apikey', '' ),
			'live_api_key'    => get_option( 'monei_live_apikey', '' ),
			'test_account_id' => get_option( 'monei_test_accountid', '' ),
			'live_account_id' => get_option( 'monei_live_accountid', '' ),
			'current_mode'    => get_option( 'monei_apikey_mode', '' ),
		);
	}

	/**
	 * Check if any migration is needed
	 *
	 * @param array $keyState Current key state
	 * @return bool True if migration is needed
	 */
	private function needsMigration( $keyState ) {
		// Get legacy keys
		$legacyApiKey      = get_option( 'monei_apikey', '' );
		$legacyAccountId   = get_option( 'monei_accountid', '' );
		$existingSettings  = get_option( 'woocommerce_monei_settings', array() );
		$settingsApiKey    = $existingSettings['apikey'] ?? '';
		$settingsAccountId = $existingSettings['accountid'] ?? '';

		// Check if both new key sets are complete
		$testKeysComplete = ! empty( $keyState['test_api_key'] ) && ! empty( $keyState['test_account_id'] );
		$liveKeysComplete = ! empty( $keyState['live_api_key'] ) && ! empty( $keyState['live_account_id'] );

		// If both are complete, no migration needed
		if ( $testKeysComplete && $liveKeysComplete ) {
			return false;
		}

		// If we have any legacy keys or incomplete new keys, migration is needed
		return ! empty( $legacyApiKey ) || ! empty( $legacyAccountId ) ||
			! empty( $settingsApiKey ) || ! empty( $settingsAccountId ) ||
			( ! empty( $keyState['test_api_key'] ) && empty( $keyState['test_account_id'] ) ) ||
			( ! empty( $keyState['live_api_key'] ) && empty( $keyState['live_account_id'] ) );
	}

	/**
	 * Migrate standalone legacy keys (works regardless of settings existence)
	 *
	 * @param array $keyState Current key state
	 * @return bool True if migration was successful and complete, false if settings migration is still needed
	 */
	private function migrateStandaloneKeys( $keyState ) {
		// Get legacy standalone keys
		$legacyApiKey    = get_option( 'monei_apikey', '' );
		$legacyAccountId = get_option( 'monei_accountid', '' );

		$needsCleanup           = false;
		$migratedFromStandalone = false;

		// Complete partial new keys using legacy standalone keys
		if ( ! empty( $keyState['test_api_key'] ) && empty( $keyState['test_account_id'] ) && ! empty( $legacyAccountId ) ) {
			update_option( 'monei_test_accountid', $legacyAccountId );
			$needsCleanup           = true;
			$migratedFromStandalone = true;
		}

		if ( ! empty( $keyState['live_api_key'] ) && empty( $keyState['live_account_id'] ) && ! empty( $legacyAccountId ) ) {
			update_option( 'monei_live_accountid', $legacyAccountId );
			$needsCleanup           = true;
			$migratedFromStandalone = true;
		}

		// Set mode based on existing new keys if mode is not set
		if ( empty( $keyState['current_mode'] ) ) {
			if ( ! empty( $keyState['test_api_key'] ) ) {
				update_option( 'monei_apikey_mode', 'test' );
			} elseif ( ! empty( $keyState['live_api_key'] ) ) {
				update_option( 'monei_apikey_mode', 'live' );
			}
		}

		// Full migration from legacy standalone keys if no new keys exist
		if ( empty( $keyState['test_api_key'] ) && empty( $keyState['live_api_key'] ) && ! empty( $legacyApiKey ) ) {
			if ( $this->migrateSingleKeySet( $legacyApiKey, $legacyAccountId, $keyState['current_mode'] ) ) {
				$needsCleanup           = true;
				$migratedFromStandalone = true;
			}
		}

		// Clean up legacy standalone keys if we migrated
		if ( $needsCleanup ) {
			delete_option( 'monei_apikey' );
			delete_option( 'monei_accountid' );
		}

		// Return true if we migrated anything from standalone (has priority over settings)
		// or if we already had complete key sets
		$initialTestKeysComplete = ! empty( $keyState['test_api_key'] ) && ! empty( $keyState['test_account_id'] );
		$initialLiveKeysComplete = ! empty( $keyState['live_api_key'] ) && ! empty( $keyState['live_account_id'] );

		return $migratedFromStandalone || ( $initialTestKeysComplete || $initialLiveKeysComplete );
	}

	/**
	 * Process and migrate API keys from settings (only called via filter)
	 *
	 * @param array $default_params The settings array from the filter
	 * @return array The processed settings array
	 */
	public function processCentralSettings( $default_params ) {
		$newTestApiKey    = get_option( 'monei_test_apikey', '' );
		$newLiveApiKey    = get_option( 'monei_live_apikey', '' );
		$newTestAccountId = get_option( 'monei_test_accountid', '' );
		$newLiveAccountId = get_option( 'monei_live_accountid', '' );
		$currentMode      = get_option( 'monei_apikey_mode', '' );

		// Get keys from settings
		$settingsApiKey    = $default_params['apikey'] ?? '';
		$settingsAccountId = $default_params['accountid'] ?? '';

		$needsCleanup     = false;
		$testKeysComplete = ! empty( $newTestApiKey ) && ! empty( $newTestAccountId );
		$liveKeysComplete = ! empty( $newLiveApiKey ) && ! empty( $newLiveAccountId );

		// If both sets are complete, just clean up settings and return
		if ( $testKeysComplete && $liveKeysComplete ) {
			if ( empty( $currentMode ) ) {
				update_option( 'monei_apikey_mode', 'test' );
			}
			return $this->cleanup_legacy_keys( $default_params );
		}

		// Complete partial new keys using settings keys
		if ( ! empty( $newTestApiKey ) && empty( $newTestAccountId ) && ! empty( $settingsAccountId ) ) {
			update_option( 'monei_test_accountid', $settingsAccountId );
			$needsCleanup = true;
		}

		if ( ! empty( $newLiveApiKey ) && empty( $newLiveAccountId ) && ! empty( $settingsAccountId ) ) {
			update_option( 'monei_live_accountid', $settingsAccountId );
			$needsCleanup = true;
		}

		// Set mode based on existing new keys if mode is not set
		if ( empty( $currentMode ) ) {
			if ( ! empty( $newTestApiKey ) ) {
				update_option( 'monei_apikey_mode', 'test' );
			} elseif ( ! empty( $newLiveApiKey ) ) {
				update_option( 'monei_apikey_mode', 'live' );
			}
		}

		// Full migration from settings keys if no new keys exist
		if ( empty( $newTestApiKey ) && empty( $newLiveApiKey ) && ! empty( $settingsApiKey ) ) {
			if ( $this->migrateSingleKeySet( $settingsApiKey, $settingsAccountId, $currentMode ) ) {
				$needsCleanup = true;
			}
		}

		// Clean up legacy keys from settings if we did any migration
		if ( $needsCleanup ) {
			$default_params = $this->cleanup_legacy_keys( $default_params );
		}

		return $default_params;
	}

	/**
	 * Migrate a single key set based on key prefix
	 *
	 * @param string $apiKey The API key to migrate
	 * @param string $accountId The account ID to migrate
	 * @param string $currentMode Current mode setting
	 * @return bool True if migration occurred
	 */
	private function migrateSingleKeySet( $apiKey, $accountId, $currentMode ) {
		if ( strpos( $apiKey, 'pk_test_' ) === 0 ) {
			update_option( 'monei_test_apikey', $apiKey );
			if ( ! empty( $accountId ) ) {
				update_option( 'monei_test_accountid', $accountId );
			}
			if ( empty( $currentMode ) ) {
				update_option( 'monei_apikey_mode', 'test' );
			}
			return true;
		} elseif ( strpos( $apiKey, 'pk_live_' ) === 0 ) {
			update_option( 'monei_live_apikey', $apiKey );
			if ( ! empty( $accountId ) ) {
				update_option( 'monei_live_accountid', $accountId );
			}
			if ( empty( $currentMode ) ) {
				update_option( 'monei_apikey_mode', 'live' );
			}
			return true;
		}
		return false;
	}

	/**
	 * Clean up legacy keys from settings array
	 *
	 * @param array $settings_array The settings array
	 * @return array The cleaned settings array
	 */
	private function cleanup_legacy_keys( $settings_array ) {
		if ( isset( $settings_array['apikey'] ) ) {
			unset( $settings_array['apikey'] );
		}
		if ( isset( $settings_array['accountid'] ) ) {
			unset( $settings_array['accountid'] );
		}

		return $settings_array;
	}
}