auth-framework 0.4.2

//! Migration execution engine
//!
//! This module provides the execution engine for migration plans,
//! including progress tracking, error handling, and rollback capabilities.

use super::{
    MigrationConfig, MigrationError, MigrationMetrics, MigrationOperation, MigrationPlan,
    MigrationResult, MigrationStatus,
};
use std::collections::HashMap;
use tokio::fs;
use uuid::Uuid;

/// Execute migration plan
pub async fn execute_migration_plan(
    plan: &MigrationPlan,
    config: &MigrationConfig,
) -> Result<MigrationResult, MigrationError> {
    let _execution_id = Uuid::new_v4().to_string();
    let started_at = chrono::Utc::now();

    let mut result = MigrationResult {
        plan_id: plan.id.clone(),
        status: MigrationStatus::InProgress,
        started_at,
        completed_at: None,
        phases_completed: Vec::new(),
        current_phase: None,
        errors: Vec::new(),
        warnings: Vec::new(),
        metrics: MigrationMetrics {
            roles_migrated: 0,
            permissions_migrated: 0,
            users_migrated: 0,
            errors_encountered: 0,
            warnings_generated: 0,
            validation_failures: 0,
            rollback_count: 0,
        },
    };

    // Save initial status
    save_migration_status(&result, config).await?;

    if config.dry_run {
        log_message(config, "DRY RUN MODE - No actual changes will be made");
        return execute_dry_run(plan, config, result).await;
    }

    // Execute pre-validation steps
    if let Err(e) = execute_pre_validation(plan, config, &mut result).await {
        result.status = MigrationStatus::Failed;
        result.errors.push(format!("Pre-validation failed: {}", e));
        save_migration_status(&result, config).await?;
        return Ok(result);
    }

    // Execute migration phases
    for phase in &plan.phases {
        result.current_phase = Some(phase.id.clone());
        save_migration_status(&result, config).await?;

        log_message(
            config,
            &format!("Executing phase: {} - {}", phase.id, phase.name),
        );

        match execute_phase(phase, config, &mut result).await {
            Ok(_) => {
                result.phases_completed.push(phase.id.clone());
                log_message(
                    config,
                    &format!("Phase '{}' completed successfully", phase.id),
                );
            }
            Err(e) => {
                result.status = MigrationStatus::Failed;
                result
                    .errors
                    .push(format!("Phase '{}' failed: {}", phase.id, e));
                result.metrics.errors_encountered += 1;

                log_message(config, &format!("Phase '{}' failed: {}", phase.id, e));

                // Attempt automatic rollback
                if let Err(rollback_error) =
                    execute_rollback_for_phase(phase, config, &mut result).await
                {
                    result.errors.push(format!(
                        "Rollback for phase '{}' failed: {}",
                        phase.id, rollback_error
                    ));
                }

                save_migration_status(&result, config).await?;
                return Ok(result);
            }
        }
    }

    // Execute post-validation steps
    if let Err(e) = execute_post_validation(plan, config, &mut result).await {
        result.status = MigrationStatus::Failed;
        result.errors.push(format!("Post-validation failed: {}", e));
        save_migration_status(&result, config).await?;
        return Ok(result);
    }

    // Migration completed successfully
    result.status = MigrationStatus::Completed;
    result.completed_at = Some(chrono::Utc::now());
    result.current_phase = None;

    log_message(config, "Migration completed successfully");
    save_migration_status(&result, config).await?;

    Ok(result)
}

/// Execute migration plan in dry-run mode
async fn execute_dry_run(
    plan: &MigrationPlan,
    config: &MigrationConfig,
    mut result: MigrationResult,
) -> Result<MigrationResult, MigrationError> {
    log_message(config, "=== DRY RUN EXECUTION ===");

    for phase in &plan.phases {
        log_message(
            config,
            &format!("DRY RUN - Phase: {} - {}", phase.id, phase.name),
        );

        for operation in &phase.operations {
            match operation {
                MigrationOperation::CreateRole { role_id, name, .. } => {
                    log_message(
                        config,
                        &format!("  [DRY RUN] Would create role: {} ({})", role_id, name),
                    );
                    result.metrics.roles_migrated += 1;
                }
                MigrationOperation::CreatePermission {
                    permission_id,
                    action,
                    resource,
                    ..
                } => {
                    log_message(
                        config,
                        &format!(
                            "  [DRY RUN] Would create permission: {} ({}:{})",
                            permission_id, action, resource
                        ),
                    );
                    result.metrics.permissions_migrated += 1;
                }
                MigrationOperation::AssignUserRole {
                    user_id, role_id, ..
                } => {
                    log_message(
                        config,
                        &format!(
                            "  [DRY RUN] Would assign role {} to user {}",
                            role_id, user_id
                        ),
                    );
                    result.metrics.users_migrated += 1;
                }
                MigrationOperation::Backup {
                    backup_location,
                    backup_type,
                } => {
                    log_message(
                        config,
                        &format!(
                            "  [DRY RUN] Would create {:?} backup at {:?}",
                            backup_type, backup_location
                        ),
                    );
                }
                MigrationOperation::ValidateIntegrity {
                    validation_type, ..
                } => {
                    log_message(
                        config,
                        &format!("  [DRY RUN] Would validate: {}", validation_type),
                    );
                }
                MigrationOperation::MigrateCustomAttribute { attribute_name, .. } => {
                    log_message(
                        config,
                        &format!(
                            "  [DRY RUN] Would migrate custom attribute: {}",
                            attribute_name
                        ),
                    );
                }
            }
        }

        result.phases_completed.push(phase.id.clone());
    }

    result.status = MigrationStatus::Completed;
    result.completed_at = Some(chrono::Utc::now());

    log_message(config, "=== DRY RUN COMPLETED ===");

    Ok(result)
}

/// Execute pre-validation steps
async fn execute_pre_validation(
    plan: &MigrationPlan,
    config: &MigrationConfig,
    result: &mut MigrationResult,
) -> Result<(), MigrationError> {
    log_message(config, "Executing pre-validation steps");

    for step in &plan.pre_validation_steps {
        log_message(
            config,
            &format!("Pre-validation: {} - {}", step.id, step.name),
        );

        match execute_validation_step(step, config).await {
            Ok(_) => {
                log_message(config, &format!("Pre-validation '{}' passed", step.id));
            }
            Err(e) => {
                if step.required {
                    return Err(MigrationError::ValidationError(format!(
                        "Required pre-validation '{}' failed: {}",
                        step.id, e
                    )));
                } else {
                    result.warnings.push(format!(
                        "Optional pre-validation '{}' failed: {}",
                        step.id, e
                    ));
                    result.metrics.warnings_generated += 1;
                }
            }
        }
    }

    Ok(())
}

/// Execute post-validation steps
async fn execute_post_validation(
    plan: &MigrationPlan,
    config: &MigrationConfig,
    result: &mut MigrationResult,
) -> Result<(), MigrationError> {
    log_message(config, "Executing post-validation steps");

    for step in &plan.post_validation_steps {
        log_message(
            config,
            &format!("Post-validation: {} - {}", step.id, step.name),
        );

        match execute_validation_step(step, config).await {
            Ok(_) => {
                log_message(config, &format!("Post-validation '{}' passed", step.id));
            }
            Err(e) => {
                if step.required {
                    result.metrics.validation_failures += 1;
                    return Err(MigrationError::ValidationError(format!(
                        "Required post-validation '{}' failed: {}",
                        step.id, e
                    )));
                } else {
                    result.warnings.push(format!(
                        "Optional post-validation '{}' failed: {}",
                        step.id, e
                    ));
                    result.metrics.warnings_generated += 1;
                }
            }
        }
    }

    Ok(())
}

/// Execute individual validation step
async fn execute_validation_step(
    step: &super::ValidationStep,
    config: &MigrationConfig,
) -> Result<(), MigrationError> {
    use super::ValidationType;

    match &step.validation_type {
        ValidationType::HierarchyIntegrity => validate_hierarchy_integrity(config).await,
        ValidationType::PermissionConsistency => validate_permission_consistency(config).await,
        ValidationType::UserAssignmentValidity => validate_user_assignments(config).await,
        ValidationType::PrivilegeEscalationCheck => validate_no_privilege_escalation(config).await,
        ValidationType::Custom(validation_name) => {
            execute_custom_validation(validation_name, &step.parameters, config).await
        }
    }
}

/// Execute migration phase
async fn execute_phase(
    phase: &super::MigrationPhase,
    config: &MigrationConfig,
    result: &mut MigrationResult,
) -> Result<(), MigrationError> {
    for operation in &phase.operations {
        if let Err(e) = execute_operation(operation, config, result).await {
            return Err(MigrationError::ExecutionError(format!(
                "Operation failed in phase '{}': {}",
                phase.id, e
            )));
        }
    }
    Ok(())
}

/// Execute individual migration operation
async fn execute_operation(
    operation: &MigrationOperation,
    config: &MigrationConfig,
    result: &mut MigrationResult,
) -> Result<(), MigrationError> {
    match operation {
        MigrationOperation::CreateRole {
            role_id,
            name,
            description,
            permissions,
            parent_role,
        } => {
            execute_create_role(
                role_id,
                name,
                description.as_deref(),
                permissions,
                parent_role.as_deref(),
                config,
            )
            .await?;
            result.metrics.roles_migrated += 1;
        }
        MigrationOperation::CreatePermission {
            permission_id,
            action,
            resource,
            conditions,
        } => {
            execute_create_permission(permission_id, action, resource, conditions, config).await?;
            result.metrics.permissions_migrated += 1;
        }
        MigrationOperation::AssignUserRole {
            user_id,
            role_id,
            expiration,
        } => {
            execute_assign_user_role(user_id, role_id, expiration.as_ref(), config).await?;
            result.metrics.users_migrated += 1;
        }
        MigrationOperation::Backup {
            backup_location,
            backup_type,
        } => {
            execute_backup(backup_location, backup_type, config).await?;
        }
        MigrationOperation::ValidateIntegrity {
            validation_type,
            parameters,
        } => {
            execute_integrity_validation(validation_type, parameters, config).await?;
        }
        MigrationOperation::MigrateCustomAttribute {
            attribute_name,
            conversion_logic,
        } => {
            execute_custom_attribute_migration(attribute_name, conversion_logic, config).await?;
        }
    }

    Ok(())
}

/// Execute role creation
async fn execute_create_role(
    role_id: &str,
    name: &str,
    description: Option<&str>,
    permissions: &[String],
    parent_role: Option<&str>,
    config: &MigrationConfig,
) -> Result<(), MigrationError> {
    log_message(config, &format!("Creating role: {} ({})", role_id, name));

    // In a real implementation, this would integrate with the role-system v1.0 API
    // For now, we'll simulate the operation

    if config.verbose {
        log_message(config, &format!("  Description: {:?}", description));
        log_message(config, &format!("  Permissions: {:?}", permissions));
        log_message(config, &format!("  Parent role: {:?}", parent_role));
    }

    // Simulate API call delay
    tokio::time::sleep(tokio::time::Duration::from_millis(100)).await;

    // Here you would integrate with the actual role-system v1.0 AsyncRoleSystem
    // Example:
    // let role_system = get_role_system(config).await?;
    // role_system.create_role(role_id, name, description, permissions, parent_role).await?;

    Ok(())
}

/// Execute permission creation
async fn execute_create_permission(
    permission_id: &str,
    action: &str,
    resource: &str,
    conditions: &HashMap<String, String>,
    config: &MigrationConfig,
) -> Result<(), MigrationError> {
    log_message(
        config,
        &format!(
            "Creating permission: {} ({}:{})",
            permission_id, action, resource
        ),
    );

    if config.verbose {
        log_message(config, &format!("  Conditions: {:?}", conditions));
    }

    // Simulate API call delay
    tokio::time::sleep(tokio::time::Duration::from_millis(50)).await;

    // Here you would integrate with the actual role-system v1.0 AsyncRoleSystem
    // Example:
    // let role_system = get_role_system(config).await?;
    // role_system.create_permission(permission_id, action, resource, conditions).await?;

    Ok(())
}

/// Execute user role assignment
async fn execute_assign_user_role(
    user_id: &str,
    role_id: &str,
    expiration: Option<&chrono::DateTime<chrono::Utc>>,
    config: &MigrationConfig,
) -> Result<(), MigrationError> {
    log_message(
        config,
        &format!("Assigning role {} to user {}", role_id, user_id),
    );

    if config.verbose {
        log_message(config, &format!("  Expiration: {:?}", expiration));
    }

    // Simulate API call delay
    tokio::time::sleep(tokio::time::Duration::from_millis(50)).await;

    // Here you would integrate with the actual role-system v1.0 AsyncRoleSystem
    // Example:
    // let role_system = get_role_system(config).await?;
    // role_system.assign_user_role(user_id, role_id, expiration).await?;

    Ok(())
}

/// Execute backup operation
async fn execute_backup(
    backup_location: &std::path::Path,
    backup_type: &super::BackupType,
    config: &MigrationConfig,
) -> Result<(), MigrationError> {
    log_message(
        config,
        &format!("Creating {:?} backup at {:?}", backup_type, backup_location),
    );

    // Ensure backup directory exists
    if let Some(parent) = backup_location.parent() {
        fs::create_dir_all(parent).await?;
    }

    // Create backup (simplified implementation)
    let backup_data = match backup_type {
        super::BackupType::Full => create_full_backup(config).await?,
        super::BackupType::Incremental => create_incremental_backup(config).await?,
        super::BackupType::ConfigOnly => create_config_backup(config).await?,
        super::BackupType::DataOnly => create_data_backup(config).await?,
    };

    fs::write(backup_location, backup_data).await?;

    log_message(
        config,
        &format!("Backup created successfully at {:?}", backup_location),
    );

    Ok(())
}

/// Execute integrity validation
async fn execute_integrity_validation(
    validation_type: &str,
    parameters: &HashMap<String, String>,
    config: &MigrationConfig,
) -> Result<(), MigrationError> {
    log_message(
        config,
        &format!("Executing integrity validation: {}", validation_type),
    );

    if config.verbose {
        log_message(config, &format!("  Parameters: {:?}", parameters));
    }

    // Simulate validation
    tokio::time::sleep(tokio::time::Duration::from_millis(200)).await;

    match validation_type {
        "pre_migration_check" => validate_pre_migration_state(config).await,
        "post_migration_check" => validate_post_migration_state(config).await,
        "stop_migration" => Ok(()), // No-op for stop migration
        _ => {
            log_message(
                config,
                &format!("Unknown validation type: {}", validation_type),
            );
            Ok(())
        }
    }
}

/// Execute custom attribute migration
async fn execute_custom_attribute_migration(
    attribute_name: &str,
    conversion_logic: &str,
    config: &MigrationConfig,
) -> Result<(), MigrationError> {
    log_message(
        config,
        &format!("Migrating custom attribute: {}", attribute_name),
    );

    if config.verbose {
        log_message(config, &format!("  Conversion logic: {}", conversion_logic));
    }

    // Simulate custom attribute migration
    tokio::time::sleep(tokio::time::Duration::from_millis(100)).await;

    // Here you would implement the actual custom attribute migration logic
    // based on the conversion_logic parameter

    Ok(())
}

/// Execute rollback for a specific phase
async fn execute_rollback_for_phase(
    phase: &super::MigrationPhase,
    config: &MigrationConfig,
    result: &mut MigrationResult,
) -> Result<(), MigrationError> {
    log_message(
        config,
        &format!("Executing rollback for phase: {}", phase.id),
    );

    for operation in &phase.rollback_operations {
        if let Err(e) = execute_operation(operation, config, result).await {
            return Err(MigrationError::RollbackError(format!(
                "Rollback operation failed: {}",
                e
            )));
        }
    }

    result.metrics.rollback_count += 1;
    Ok(())
}

/// Execute complete migration rollback
pub async fn rollback_migration(
    plan: &MigrationPlan,
    config: &MigrationConfig,
) -> Result<MigrationResult, MigrationError> {
    let started_at = chrono::Utc::now();

    let mut result = MigrationResult {
        plan_id: plan.id.clone(),
        status: MigrationStatus::InProgress,
        started_at,
        completed_at: None,
        phases_completed: Vec::new(),
        current_phase: Some("rollback".to_string()),
        errors: Vec::new(),
        warnings: Vec::new(),
        metrics: MigrationMetrics {
            roles_migrated: 0,
            permissions_migrated: 0,
            users_migrated: 0,
            errors_encountered: 0,
            warnings_generated: 0,
            validation_failures: 0,
            rollback_count: 0,
        },
    };

    log_message(config, "Starting migration rollback");

    // Execute rollback phases in reverse order
    for phase in plan.rollback_plan.phases.iter().rev() {
        log_message(config, &format!("Executing rollback phase: {}", phase.id));

        for operation in &phase.operations {
            if let Err(e) = execute_operation(operation, config, &mut result).await {
                result.status = MigrationStatus::Failed;
                result
                    .errors
                    .push(format!("Rollback operation failed: {}", e));
                save_migration_status(&result, config).await?;
                return Ok(result);
            }
        }

        result.phases_completed.push(phase.id.clone());
    }

    result.status = MigrationStatus::RolledBack;
    result.completed_at = Some(chrono::Utc::now());
    result.current_phase = None;

    log_message(config, "Migration rollback completed");
    save_migration_status(&result, config).await?;

    Ok(result)
}

/// Validation implementations
async fn validate_hierarchy_integrity(_config: &MigrationConfig) -> Result<(), MigrationError> {
    // Simulate hierarchy validation
    tokio::time::sleep(tokio::time::Duration::from_millis(100)).await;
    Ok(())
}

async fn validate_permission_consistency(_config: &MigrationConfig) -> Result<(), MigrationError> {
    // Simulate permission validation
    tokio::time::sleep(tokio::time::Duration::from_millis(100)).await;
    Ok(())
}

async fn validate_user_assignments(_config: &MigrationConfig) -> Result<(), MigrationError> {
    // Simulate user assignment validation
    tokio::time::sleep(tokio::time::Duration::from_millis(100)).await;
    Ok(())
}

async fn validate_no_privilege_escalation(_config: &MigrationConfig) -> Result<(), MigrationError> {
    // Simulate privilege escalation check
    tokio::time::sleep(tokio::time::Duration::from_millis(150)).await;
    Ok(())
}

async fn execute_custom_validation(
    validation_name: &str,
    _parameters: &HashMap<String, String>,
    config: &MigrationConfig,
) -> Result<(), MigrationError> {
    log_message(
        config,
        &format!("Executing custom validation: {}", validation_name),
    );
    tokio::time::sleep(tokio::time::Duration::from_millis(100)).await;
    Ok(())
}

async fn validate_pre_migration_state(_config: &MigrationConfig) -> Result<(), MigrationError> {
    // Simulate pre-migration state validation
    tokio::time::sleep(tokio::time::Duration::from_millis(200)).await;
    Ok(())
}

async fn validate_post_migration_state(_config: &MigrationConfig) -> Result<(), MigrationError> {
    // Simulate post-migration state validation
    tokio::time::sleep(tokio::time::Duration::from_millis(200)).await;
    Ok(())
}

/// Backup implementations
async fn create_full_backup(_config: &MigrationConfig) -> Result<String, MigrationError> {
    Ok("FULL_BACKUP_DATA".to_string())
}

async fn create_incremental_backup(_config: &MigrationConfig) -> Result<String, MigrationError> {
    Ok("INCREMENTAL_BACKUP_DATA".to_string())
}

async fn create_config_backup(_config: &MigrationConfig) -> Result<String, MigrationError> {
    Ok("CONFIG_BACKUP_DATA".to_string())
}

async fn create_data_backup(_config: &MigrationConfig) -> Result<String, MigrationError> {
    Ok("DATA_BACKUP_DATA".to_string())
}

/// Save migration status to disk
async fn save_migration_status(
    result: &MigrationResult,
    config: &MigrationConfig,
) -> Result<(), MigrationError> {
    let status_file = config
        .working_directory
        .join(format!("{}_status.json", result.plan_id));
    let content = serde_json::to_string_pretty(result)?;
    fs::write(status_file, content).await?;
    Ok(())
}

/// Log message with timestamp
fn log_message(config: &MigrationConfig, message: &str) {
    if config.verbose {
        let timestamp = chrono::Utc::now().format("%Y-%m-%d %H:%M:%S");
        println!("[{}] {}", timestamp, message);
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::migration::{
        LegacySystemAnalysis, LegacySystemType, MigrationPhase, MigrationStrategy, RiskLevel,
    };

    fn create_test_plan() -> MigrationPlan {
        MigrationPlan {
            id: "test_plan".to_string(),
            source_analysis: LegacySystemAnalysis {
                system_type: LegacySystemType::BasicRbac,
                role_count: 1,
                permission_count: 1,
                user_assignment_count: 1,
                roles: vec![],
                permissions: vec![],
                user_assignments: vec![],
                hierarchy_depth: 0,
                duplicates_found: false,
                orphaned_permissions: vec![],
                circular_dependencies: vec![],
                custom_attributes: std::collections::HashSet::new(),
                complexity_score: 3,
                recommended_strategy: MigrationStrategy::DirectMapping,
            },
            strategy: MigrationStrategy::DirectMapping,
            phases: vec![MigrationPhase {
                id: "test_phase".to_string(),
                name: "Test Phase".to_string(),
                description: "Test phase".to_string(),
                order: 1,
                operations: vec![MigrationOperation::CreateRole {
                    role_id: "test_role".to_string(),
                    name: "Test Role".to_string(),
                    description: None,
                    permissions: vec!["read".to_string()],
                    parent_role: None,
                }],
                dependencies: vec![],
                estimated_duration: chrono::Duration::minutes(1),
                rollback_operations: vec![],
            }],
            role_mappings: std::collections::HashMap::new(),
            permission_mappings: std::collections::HashMap::new(),
            user_migrations: vec![],
            pre_validation_steps: vec![],
            post_validation_steps: vec![],
            rollback_plan: super::super::RollbackPlan {
                phases: vec![],
                backup_locations: vec![],
                recovery_time_objective: chrono::Duration::hours(1),
                manual_steps: vec![],
            },
            estimated_duration: chrono::Duration::minutes(30),
            risk_level: RiskLevel::Low,
            downtime_required: None,
        }
    }

    #[tokio::test]
    async fn test_execute_migration_plan_dry_run() {
        let plan = create_test_plan();
        let config = MigrationConfig {
            dry_run: true,
            verbose: false, // Reduce test output
            ..Default::default()
        };

        let result = execute_migration_plan(&plan, &config).await.unwrap();

        assert_eq!(result.status, MigrationStatus::Completed);
        assert_eq!(result.phases_completed.len(), 1);
        assert_eq!(result.metrics.roles_migrated, 1);
    }

    #[tokio::test]
    async fn test_execute_migration_plan_real() {
        let plan = create_test_plan();
        let config = MigrationConfig {
            dry_run: false,
            verbose: false, // Reduce test output
            ..Default::default()
        };

        let result = execute_migration_plan(&plan, &config).await.unwrap();

        assert_eq!(result.status, MigrationStatus::Completed);
        assert_eq!(result.phases_completed.len(), 1);
        assert_eq!(result.metrics.roles_migrated, 1);
    }
}