<?php

namespace classes;

/**
 * Ensures additive department edge gateway tables exist.
 *
 * The legacy PHP stack has no centralized migration runner, so this bootstrap
 * must be safe to call from runtime flows and tests.
 */
class edge_gateway_schema_bootstrap
{
    private static bool $initialized = false;

    public static function ensureTables(): void
    {
        if (self::$initialized) {
            return;
        }

        global $db;

        $queries = [
            "CREATE TABLE IF NOT EXISTS edge_gateways (
                id INT AUTO_INCREMENT PRIMARY KEY,
                department_id INT NOT NULL,
                label VARCHAR(255) NOT NULL,
                hostname VARCHAR(255) NULL,
                agent_token_hash VARCHAR(255) NOT NULL,
                status VARCHAR(32) NOT NULL DEFAULT 'PENDING',
                transport_mode VARCHAR(32) NOT NULL DEFAULT 'gateway',
                release_channel VARCHAR(32) NOT NULL DEFAULT 'stable',
                installed_version VARCHAR(64) NULL,
                target_version VARCHAR(64) NULL,
                last_heartbeat_at DATETIME NULL,
                last_seen_ip VARCHAR(64) NULL,
                discovery_status VARCHAR(32) NOT NULL DEFAULT 'PENDING',
                is_primary TINYINT(1) NOT NULL DEFAULT 1,
                metadata_json JSON NULL,
                created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
                updated_at TIMESTAMP NULL DEFAULT NULL ON UPDATE CURRENT_TIMESTAMP,
                deleted_at TIMESTAMP NULL DEFAULT NULL,
                INDEX idx_edge_gateways_department_status (department_id, status),
                INDEX idx_edge_gateways_department_primary (department_id, is_primary),
                INDEX idx_edge_gateways_last_heartbeat (last_heartbeat_at)
            ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci",

            "CREATE TABLE IF NOT EXISTS edge_gateway_claim_tokens (
                id INT AUTO_INCREMENT PRIMARY KEY,
                department_id INT NOT NULL,
                label VARCHAR(255) NULL,
                token_hash VARCHAR(255) NOT NULL,
                created_by INT NULL,
                expires_at DATETIME NOT NULL,
                used_at DATETIME NULL,
                metadata_json JSON NULL,
                created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
                updated_at TIMESTAMP NULL DEFAULT NULL ON UPDATE CURRENT_TIMESTAMP,
                deleted_at TIMESTAMP NULL DEFAULT NULL,
                INDEX idx_edge_gateway_claim_tokens_department (department_id),
                INDEX idx_edge_gateway_claim_tokens_expires (expires_at),
                INDEX idx_edge_gateway_claim_tokens_used (used_at)
            ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci",

            "CREATE TABLE IF NOT EXISTS edge_gateway_device_inventory (
                id INT AUTO_INCREMENT PRIMARY KEY,
                gateway_id INT NOT NULL,
                device_id VARCHAR(255) NOT NULL,
                local_ip VARCHAR(64) NULL,
                model VARCHAR(255) NULL,
                channel_count INT NOT NULL DEFAULT 1,
                capabilities_json JSON NULL,
                online TINYINT(1) NOT NULL DEFAULT 0,
                last_seen_at DATETIME NULL,
                metadata_json JSON NULL,
                created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
                updated_at TIMESTAMP NULL DEFAULT NULL ON UPDATE CURRENT_TIMESTAMP,
                deleted_at TIMESTAMP NULL DEFAULT NULL,
                UNIQUE KEY uniq_edge_gateway_inventory_device (gateway_id, device_id),
                INDEX idx_edge_gateway_inventory_gateway (gateway_id),
                INDEX idx_edge_gateway_inventory_ip (local_ip)
            ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci",

            "CREATE TABLE IF NOT EXISTS edge_gateway_relay_bindings (
                id INT AUTO_INCREMENT PRIMARY KEY,
                gateway_id INT NOT NULL,
                department_id INT NOT NULL,
                relay_id VARCHAR(255) NOT NULL,
                device_id VARCHAR(255) NOT NULL,
                local_ip VARCHAR(64) NULL,
                channel INT NOT NULL DEFAULT 0,
                binding_source VARCHAR(64) NOT NULL DEFAULT 'MANUAL',
                approved_by INT NULL,
                approved_at DATETIME NULL,
                metadata_json JSON NULL,
                created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
                updated_at TIMESTAMP NULL DEFAULT NULL ON UPDATE CURRENT_TIMESTAMP,
                deleted_at TIMESTAMP NULL DEFAULT NULL,
                UNIQUE KEY uniq_edge_gateway_binding (gateway_id, relay_id),
                INDEX idx_edge_gateway_binding_department (department_id),
                INDEX idx_edge_gateway_binding_device (gateway_id, device_id)
            ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci",

            "CREATE TABLE IF NOT EXISTS edge_gateway_command_jobs (
                id INT AUTO_INCREMENT PRIMARY KEY,
                gateway_id INT NOT NULL,
                command_type VARCHAR(64) NOT NULL,
                status VARCHAR(32) NOT NULL DEFAULT 'PENDING',
                request_json JSON NULL,
                response_json JSON NULL,
                delivery_json JSON NULL,
                correlation_id VARCHAR(128) NOT NULL,
                requested_by INT NULL,
                requested_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
                completed_at DATETIME NULL,
                error_message TEXT NULL,
                created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
                updated_at TIMESTAMP NULL DEFAULT NULL ON UPDATE CURRENT_TIMESTAMP,
                deleted_at TIMESTAMP NULL DEFAULT NULL,
                UNIQUE KEY uniq_edge_gateway_command_correlation (correlation_id),
                INDEX idx_edge_gateway_command_gateway (gateway_id),
                INDEX idx_edge_gateway_command_status (status),
                INDEX idx_edge_gateway_command_type (command_type)
            ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci",

            "CREATE TABLE IF NOT EXISTS edge_gateway_update_jobs (
                id INT AUTO_INCREMENT PRIMARY KEY,
                gateway_id INT NOT NULL,
                command_job_id INT NULL,
                target_version VARCHAR(64) NOT NULL,
                release_channel VARCHAR(32) NOT NULL DEFAULT 'stable',
                status VARCHAR(32) NOT NULL DEFAULT 'PENDING',
                requested_by INT NULL,
                requested_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
                started_at DATETIME NULL,
                completed_at DATETIME NULL,
                delivery_json JSON NULL,
                result_json JSON NULL,
                created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
                updated_at TIMESTAMP NULL DEFAULT NULL ON UPDATE CURRENT_TIMESTAMP,
                deleted_at TIMESTAMP NULL DEFAULT NULL,
                INDEX idx_edge_gateway_update_gateway (gateway_id),
                INDEX idx_edge_gateway_update_command (command_job_id),
                INDEX idx_edge_gateway_update_status (status)
            ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci",

            "CREATE TABLE IF NOT EXISTS edge_gateway_shell_sessions (
                id INT AUTO_INCREMENT PRIMARY KEY,
                gateway_id INT NOT NULL,
                reason TEXT NOT NULL,
                approval_status VARCHAR(32) NOT NULL DEFAULT 'APPROVED',
                session_token_hash VARCHAR(255) NOT NULL,
                requested_by INT NULL,
                approved_by INT NULL,
                approved_at DATETIME NULL,
                expires_at DATETIME NOT NULL,
                opened_at DATETIME NULL,
                closed_at DATETIME NULL,
                transcript_text LONGTEXT NULL,
                metadata_json JSON NULL,
                created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
                updated_at TIMESTAMP NULL DEFAULT NULL ON UPDATE CURRENT_TIMESTAMP,
                deleted_at TIMESTAMP NULL DEFAULT NULL,
                INDEX idx_edge_gateway_shell_gateway (gateway_id),
                INDEX idx_edge_gateway_shell_expires (expires_at),
                INDEX idx_edge_gateway_shell_status (approval_status)
            ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci",

            "CREATE TABLE IF NOT EXISTS edge_gateway_shell_action_jobs (
                id INT AUTO_INCREMENT PRIMARY KEY,
                gateway_id INT NOT NULL,
                session_id INT NOT NULL,
                action_type VARCHAR(32) NOT NULL,
                status VARCHAR(32) NOT NULL DEFAULT 'PENDING',
                payload_json JSON NULL,
                delivery_json JSON NULL,
                requested_by INT NULL,
                requested_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
                completed_at DATETIME NULL,
                error_message TEXT NULL,
                created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
                updated_at TIMESTAMP NULL DEFAULT NULL ON UPDATE CURRENT_TIMESTAMP,
                deleted_at TIMESTAMP NULL DEFAULT NULL,
                INDEX idx_edge_gateway_shell_action_gateway (gateway_id),
                INDEX idx_edge_gateway_shell_action_session (session_id),
                INDEX idx_edge_gateway_shell_action_status (status),
                INDEX idx_edge_gateway_shell_action_type (action_type)
            ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci",

            "CREATE TABLE IF NOT EXISTS edge_gateway_shell_events (
                id INT AUTO_INCREMENT PRIMARY KEY,
                gateway_id INT NOT NULL,
                session_id INT NOT NULL,
                event_type VARCHAR(32) NOT NULL,
                payload_json JSON NULL,
                created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
                deleted_at TIMESTAMP NULL DEFAULT NULL,
                INDEX idx_edge_gateway_shell_event_gateway (gateway_id),
                INDEX idx_edge_gateway_shell_event_session (session_id),
                INDEX idx_edge_gateway_shell_event_type (event_type)
            ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci",

            "CREATE TABLE IF NOT EXISTS edge_gateway_audit_logs (
                id INT AUTO_INCREMENT PRIMARY KEY,
                gateway_id INT NULL,
                department_id INT NULL,
                action VARCHAR(128) NOT NULL,
                actor_user_id INT NULL,
                actor_type VARCHAR(32) NOT NULL DEFAULT 'USER',
                severity VARCHAR(16) NOT NULL DEFAULT 'INFO',
                context_json JSON NULL,
                created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
                INDEX idx_edge_gateway_audit_gateway (gateway_id),
                INDEX idx_edge_gateway_audit_department (department_id),
                INDEX idx_edge_gateway_audit_action (action)
            ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci",
        ];

        foreach ($queries as $sql) {
            $db->query($sql);
        }

        if (!self::tableHasColumn('edge_gateway_update_jobs', 'command_job_id')) {
            $db->query(
                "ALTER TABLE edge_gateway_update_jobs
                 ADD COLUMN command_job_id INT NULL AFTER gateway_id,
                 ADD INDEX idx_edge_gateway_update_command (command_job_id)"
            );
        }

        if (!self::tableHasColumn('edge_gateway_command_jobs', 'delivery_json')) {
            $db->query(
                "ALTER TABLE edge_gateway_command_jobs
                 ADD COLUMN delivery_json JSON NULL AFTER response_json"
            );
        }

        if (!self::tableHasColumn('edge_gateway_shell_action_jobs', 'delivery_json')) {
            $db->query(
                "ALTER TABLE edge_gateway_shell_action_jobs
                 ADD COLUMN delivery_json JSON NULL AFTER payload_json"
            );
        }

        if (!self::tableHasColumn('edge_gateway_update_jobs', 'delivery_json')) {
            $db->query(
                "ALTER TABLE edge_gateway_update_jobs
                 ADD COLUMN delivery_json JSON NULL AFTER completed_at"
            );
        }

        self::$initialized = true;
    }

    private static function tableHasColumn(string $table, string $column): bool
    {
        global $db;

        $table = $db->escape_string($table);
        $column = $db->escape_string($column);
        $database = $db->escape_string($db->getDatabase());

        $result = $db->query(
            "SELECT COUNT(*) AS c
             FROM information_schema.COLUMNS
             WHERE TABLE_SCHEMA = '$database'
               AND TABLE_NAME = '$table'
               AND COLUMN_NAME = '$column'"
        );

        if (!$result) {
            return false;
        }

        $row = $result->fetch_assoc();
        return ((int)($row['c'] ?? 0)) > 0;
    }
}