backbone_bucket/presentation/http/

conversion_job_handler.rs

//! ConversionJob REST handlers
//!
//! Generated by metaphor-schema. Do not edit manually.
//!
//! Uses Axum and backbone-core's BackboneCrudHandler for all 12 CRUD endpoints.

use std::collections::HashMap;
use std::sync::Arc;

use axum::Router;
use serde::{Deserialize, Serialize};
use uuid::Uuid;
use chrono::{DateTime, Utc};

// Backbone framework imports
use backbone_core::http::{ApiResponse, BackboneCrudHandler};

// Auth integration (optional)
use backbone_auth::middleware::AuthContext;
#[cfg(feature = "auth")]
use backbone_auth::AuthMiddleware;

// Domain imports
use crate::domain::entity::*;
use crate::application::service::{ConversionJobService, ServiceError};

// DTO imports
use crate::presentation::dto::{CreateConversionJobDto, UpdateConversionJobDto, PatchConversionJobDto, ConversionJobResponseDto};

use crate::domain::state_machine::{ConversionJobState, ConversionJobStateMachine, ConversionJobTransition};

/// Application error type
#[derive(Debug, thiserror::Error)]
pub enum ConversionJobError {
    #[error("Not found: {0}")]
    NotFound(String),
    #[error("Validation error: {0}")]
    Validation(String),
    #[error("Database error: {0}")]
    Database(String),
    #[error("Internal error: {0}")]
    Internal(String),
    // Domain-specific errors from hook rules
    #[error("Source file must exist: {0}")]
    SourceFileNotFound(String),
    #[error("Source file must be accessible: {0}")]
    FileNotAccessible(String),
    #[error("Target format must be supported: {0}")]
    ConversionNotSupported(String),
    #[error("Insufficient storage quota for conversion result: {0}")]
    InsufficientQuota(String),
    #[error("A pending conversion with same params already exists: {0}")]
    DuplicateConversion(String),
    #[error("Progress cannot decrease: {0}")]
    InvalidProgress(String),
}

impl From<ServiceError> for ConversionJobError {
    fn from(err: ServiceError) -> Self {
        match err {
            ServiceError::NotFound => Self::NotFound(err.to_string()),
            ServiceError::Validation(ref msg) => Self::Validation(msg.clone()),
            ServiceError::AlreadyExists(ref msg) => Self::Validation(msg.clone()),
            ServiceError::Repository(ref e) => Self::Database(e.to_string()),
            ServiceError::Internal(ref msg) => Self::Internal(msg.clone()),
            ServiceError::Violations(_) => Self::Validation(err.to_string()),
        }
    }
}

impl axum::response::IntoResponse for ConversionJobError {
    fn into_response(self) -> axum::response::Response {
        use axum::http::StatusCode;
        use axum::Json;

        let (status, code) = match &self {
            Self::NotFound(_) => (StatusCode::NOT_FOUND, "CONVERSIONJOB_NOT_FOUND"),
            Self::Validation(_) => (StatusCode::BAD_REQUEST, "CONVERSIONJOB_VALIDATION_ERROR"),
            Self::Database(_) => (StatusCode::INTERNAL_SERVER_ERROR, "CONVERSIONJOB_DATABASE_ERROR"),
            Self::Internal(_) => (StatusCode::INTERNAL_SERVER_ERROR, "CONVERSIONJOB_INTERNAL_ERROR"),
            Self::SourceFileNotFound(_) => (StatusCode::UNPROCESSABLE_ENTITY, "CONVERSIONJOB_SOURCE_FILE_NOT_FOUND"),
            Self::FileNotAccessible(_) => (StatusCode::UNPROCESSABLE_ENTITY, "CONVERSIONJOB_FILE_NOT_ACCESSIBLE"),
            Self::ConversionNotSupported(_) => (StatusCode::UNPROCESSABLE_ENTITY, "CONVERSIONJOB_CONVERSION_NOT_SUPPORTED"),
            Self::InsufficientQuota(_) => (StatusCode::UNPROCESSABLE_ENTITY, "CONVERSIONJOB_INSUFFICIENT_QUOTA"),
            Self::DuplicateConversion(_) => (StatusCode::UNPROCESSABLE_ENTITY, "CONVERSIONJOB_DUPLICATE_CONVERSION"),
            Self::InvalidProgress(_) => (StatusCode::UNPROCESSABLE_ENTITY, "CONVERSIONJOB_INVALID_PROGRESS"),
        };

        let body = serde_json::json!({
            "success": false,
            "error": code,
            "message": self.to_string(),
        });

        (status, Json(body)).into_response()
    }
}

/// Domain-specific error codes for ConversionJob
pub mod conversion_job_errors {
    pub const SOURCE_FILE_NOT_FOUND: &str = "CONVERSIONJOB_SOURCE_FILE_NOT_FOUND";
    pub const FILE_NOT_ACCESSIBLE: &str = "CONVERSIONJOB_FILE_NOT_ACCESSIBLE";
    pub const CONVERSION_NOT_SUPPORTED: &str = "CONVERSIONJOB_CONVERSION_NOT_SUPPORTED";
    pub const INSUFFICIENT_QUOTA: &str = "CONVERSIONJOB_INSUFFICIENT_QUOTA";
    pub const DUPLICATE_CONVERSION: &str = "CONVERSIONJOB_DUPLICATE_CONVERSION";
    pub const INVALID_PROGRESS: &str = "CONVERSIONJOB_INVALID_PROGRESS";
}

// =============================================================================
// Route Configuration
// =============================================================================

/// Create Axum router with all 16 Backbone endpoints for ConversionJob.
///
/// # Routes
///
/// | Method | Path | Description |
/// |--------|------|-------------|
/// | GET | /conversion_jobs | List with pagination |
/// | POST | /conversion_jobs | Create new |
/// | GET | /conversion_jobs/:id | Get by ID |
/// | PUT | /conversion_jobs/:id | Full update |
/// | PATCH | /conversion_jobs/:id | Partial update |
/// | DELETE | /conversion_jobs/:id | Soft delete |
/// | POST | /conversion_jobs/bulk | Bulk create |
/// | POST | /conversion_jobs/upsert | Upsert |
/// | GET | /conversion_jobs/trash | List deleted |
/// | POST | /conversion_jobs/:id/restore | Restore |
/// | DELETE | /conversion_jobs/empty | Empty trash |
/// | GET | /conversion_jobs/:id/deleted | Get deleted by ID |
/// | DELETE | /conversion_jobs/trash/:id | Permanent delete from trash |
/// | GET | /conversion_jobs/count | Count active entities |
/// | GET | /conversion_jobs/trash/count | Count deleted entities |
///
/// # Example
///
/// ```text
/// let service = Arc::new(ConversionJobService::with_repository(repository));
/// let router = create_conversion_job_routes(service);
/// ```
pub fn create_conversion_job_routes(service: Arc<ConversionJobService>) -> Router {
    BackboneCrudHandler::<ConversionJobService, ConversionJob, CreateConversionJobDto, UpdateConversionJobDto, ConversionJobResponseDto>::routes(
        service,
        "/conversion_jobs",
    )
}

/// Create Axum router with only the read (GET) endpoints for ConversionJob.
///
/// Safe for public, unauthenticated exposure (e.g., reference data).
/// Mutations must be served separately via `create_conversion_job_write_routes`,
/// typically wrapped in an auth middleware layer.
pub fn create_conversion_job_read_routes(service: Arc<ConversionJobService>) -> Router {
    BackboneCrudHandler::<ConversionJobService, ConversionJob, CreateConversionJobDto, UpdateConversionJobDto, ConversionJobResponseDto>::read_routes(
        service,
        "/conversion_jobs",
    )
}

/// Create Axum router with only the write (mutation) endpoints for ConversionJob.
///
/// These routes must NOT be publicly exposed. Wrap them with an auth
/// middleware before nesting into the application router.
///
/// # This is unguarded generic CRUD, not a validated write path
///
/// These are plain create/update/patch/delete mutations over the entity row —
/// they bypass all business invariants. If the module exposes a validated write
/// service (e.g. a command router over its domain engine), serve THAT instead
/// for any mutation that must respect domain rules.
pub fn create_conversion_job_write_routes(service: Arc<ConversionJobService>) -> Router {
    BackboneCrudHandler::<ConversionJobService, ConversionJob, CreateConversionJobDto, UpdateConversionJobDto, ConversionJobResponseDto>::write_routes(
        service,
        "/conversion_jobs",
    )
}

/// Create authenticated routes with auth middleware.
///
/// Requires the `auth` feature flag. The `AuthMiddleware` implementation
/// is responsible for extracting and validating tokens, then providing
/// an `AuthContext` via request extensions.
#[cfg(feature = "auth")]
pub fn create_protected_conversion_job_routes<A: AuthMiddleware + Send + Sync + 'static>(
    service: Arc<ConversionJobService>,
    auth: Arc<A>,
) -> Router {
    use axum::middleware;
    use axum::response::IntoResponse;

    let auth_layer = auth.clone();
    create_conversion_job_routes(service)
        .layer(middleware::from_fn(move |mut req: axum::extract::Request, next: axum::middleware::Next| {
            let auth = auth_layer.clone();
            async move {
                let token = req.headers()
                    .get(axum::http::header::AUTHORIZATION)
                    .and_then(|h| h.to_str().ok())
                    .and_then(|raw| raw.strip_prefix("Bearer ").or_else(|| raw.strip_prefix("bearer ")))
                    .unwrap_or("");
                match auth.authenticate(token).await {
                    Ok(ctx) => {
                        req.extensions_mut().insert(ctx);
                        next.run(req).await
                    }
                    Err(_) => {
                        (axum::http::StatusCode::UNAUTHORIZED,
                         axum::Json(serde_json::json!({
                             "success": false,
                             "error": "unauthorized",
                             "message": "Authentication required"
                         }))
                        ).into_response()
                    }
                }
            }
        }))
}

// =============================================================================
// State Transition Handlers
// =============================================================================

/// Execute start transition on a ConversionJob.
///
/// POST /conversion_jobs/:id/transitions/start
pub async fn start_transition(
    axum::extract::State(service): axum::extract::State<Arc<ConversionJobService>>,
    axum::extract::Path(id): axum::extract::Path<String>,
    auth: Option<axum::Extension<AuthContext>>,
) -> impl axum::response::IntoResponse {
    use axum::{http::StatusCode, Json};

    // Get current entity
    let entity = match service.get_by_id(&id).await {
        Ok(Some(e)) => e,
        Ok(None) => return (StatusCode::NOT_FOUND, Json(ApiResponse::<ConversionJobResponseDto>::not_found("ConversionJob", &id))),
        Err(e) => return (StatusCode::INTERNAL_SERVER_ERROR, Json(ApiResponse::<ConversionJobResponseDto>::error(e.to_string()))),
    };

    // Check permission
    let Some(axum::Extension(auth)) = auth else {
        return (StatusCode::UNAUTHORIZED, Json(ApiResponse::<ConversionJobResponseDto>::error("A transition needs an authenticated caller")));
    };
    {
        let allowed_roles = ConversionJobTransition::Start.allowed_roles();
        let granted = |required: &str| auth.permissions.iter().any(|p| {
            let (have, want): (Vec<&str>, Vec<&str>) = (p.split(':').collect(), required.split(':').collect());
            have.iter().enumerate().all(|(i, h)| *h == "*" || want.get(i) == Some(h))
                && (have.len() == want.len() || (have.len() < want.len() && have.last() == Some(&"*")))
        });
        let has_specific_perm = granted("conversion_job:transition:start");
        let has_update_perm = granted("conversion_job:update");
        let has_role = auth.roles.iter().any(|r| allowed_roles.contains(&r.as_str()));
        if !has_specific_perm && !has_role {
            if !has_update_perm {
                return (StatusCode::FORBIDDEN, Json(ApiResponse::<ConversionJobResponseDto>::error("Insufficient permissions for start transition")));
            }
            tracing::warn!(target: "backbone::write_guard", entity = "ConversionJob", verb = "start", code = "transition_by_update_permission", "a transition granted only by conversion_job:update, running in shadow; it needs conversion_job:transition:start or one of the roles system");
        }
    }

    // Create state machine from entity's actual status and validate transition
    let current_state: ConversionJobState = match entity.status.to_string().parse() {
        Ok(s) => s,
        Err(_) => return (StatusCode::CONFLICT, Json(ApiResponse::<ConversionJobResponseDto>::error("The stored state is not a state of this machine"))),
    };
    let sm = ConversionJobStateMachine::from_state(current_state);
    if !sm.can_transition(ConversionJobTransition::Start) {
        return (StatusCode::BAD_REQUEST, Json(ApiResponse::<ConversionJobResponseDto>::error("Transition not allowed from current state")));
    }

    // Guard `conversion_service.is_available(source_file.mime_type, target_format)` not compiled (`conversion_service` is not a field of ConversionJob); the transition is not checked against it.
    // Apply transition via partial update
    let mut fields: HashMap<String, serde_json::Value> = HashMap::new();
    fields.insert("status".to_string(), serde_json::Value::String("processing".to_string()));

    match backbone_core::write_guard::as_transition("start", service.partial_update(&id, fields)).await {
        Ok(Some(updated)) => {
            let response: ConversionJobResponseDto = updated.into();
            (StatusCode::OK, Json(ApiResponse::ok(response)))
        }
        Ok(None) => (StatusCode::NOT_FOUND, Json(ApiResponse::<ConversionJobResponseDto>::not_found("ConversionJob", &id))),
        Err(e) => (StatusCode::INTERNAL_SERVER_ERROR, Json(ApiResponse::<ConversionJobResponseDto>::error(e.to_string()))),
    }
}

/// Execute update_progress transition on a ConversionJob.
///
/// POST /conversion_jobs/:id/transitions/update_progress
pub async fn update_progress_transition(
    axum::extract::State(service): axum::extract::State<Arc<ConversionJobService>>,
    axum::extract::Path(id): axum::extract::Path<String>,
    auth: Option<axum::Extension<AuthContext>>,
) -> impl axum::response::IntoResponse {
    use axum::{http::StatusCode, Json};

    // Get current entity
    let entity = match service.get_by_id(&id).await {
        Ok(Some(e)) => e,
        Ok(None) => return (StatusCode::NOT_FOUND, Json(ApiResponse::<ConversionJobResponseDto>::not_found("ConversionJob", &id))),
        Err(e) => return (StatusCode::INTERNAL_SERVER_ERROR, Json(ApiResponse::<ConversionJobResponseDto>::error(e.to_string()))),
    };

    // Check permission
    let Some(axum::Extension(auth)) = auth else {
        return (StatusCode::UNAUTHORIZED, Json(ApiResponse::<ConversionJobResponseDto>::error("A transition needs an authenticated caller")));
    };
    {
        let allowed_roles = ConversionJobTransition::UpdateProgress.allowed_roles();
        let granted = |required: &str| auth.permissions.iter().any(|p| {
            let (have, want): (Vec<&str>, Vec<&str>) = (p.split(':').collect(), required.split(':').collect());
            have.iter().enumerate().all(|(i, h)| *h == "*" || want.get(i) == Some(h))
                && (have.len() == want.len() || (have.len() < want.len() && have.last() == Some(&"*")))
        });
        let has_specific_perm = granted("conversion_job:transition:update_progress");
        let has_update_perm = granted("conversion_job:update");
        let has_role = auth.roles.iter().any(|r| allowed_roles.contains(&r.as_str()));
        if !has_specific_perm && !has_role {
            if !has_update_perm {
                return (StatusCode::FORBIDDEN, Json(ApiResponse::<ConversionJobResponseDto>::error("Insufficient permissions for update_progress transition")));
            }
            tracing::warn!(target: "backbone::write_guard", entity = "ConversionJob", verb = "update_progress", code = "transition_by_update_permission", "a transition granted only by conversion_job:update, running in shadow; it needs conversion_job:transition:update_progress or one of the roles system");
        }
    }

    // Create state machine from entity's actual status and validate transition
    let current_state: ConversionJobState = match entity.status.to_string().parse() {
        Ok(s) => s,
        Err(_) => return (StatusCode::CONFLICT, Json(ApiResponse::<ConversionJobResponseDto>::error("The stored state is not a state of this machine"))),
    };
    let sm = ConversionJobStateMachine::from_state(current_state);
    if !sm.can_transition(ConversionJobTransition::UpdateProgress) {
        return (StatusCode::BAD_REQUEST, Json(ApiResponse::<ConversionJobResponseDto>::error("Transition not allowed from current state")));
    }

    // Guard `$context.progress >= 0 && $context.progress <= 100 && $context.progress >= progress` not compiled (reads `$context.progress`, which a row rule cannot); the transition is not checked against it.
    // Apply transition via partial update
    let mut fields: HashMap<String, serde_json::Value> = HashMap::new();
    fields.insert("status".to_string(), serde_json::Value::String("processing".to_string()));

    match backbone_core::write_guard::as_transition("update_progress", service.partial_update(&id, fields)).await {
        Ok(Some(updated)) => {
            let response: ConversionJobResponseDto = updated.into();
            (StatusCode::OK, Json(ApiResponse::ok(response)))
        }
        Ok(None) => (StatusCode::NOT_FOUND, Json(ApiResponse::<ConversionJobResponseDto>::not_found("ConversionJob", &id))),
        Err(e) => (StatusCode::INTERNAL_SERVER_ERROR, Json(ApiResponse::<ConversionJobResponseDto>::error(e.to_string()))),
    }
}

/// Execute complete transition on a ConversionJob.
///
/// POST /conversion_jobs/:id/transitions/complete
pub async fn complete_transition(
    axum::extract::State(service): axum::extract::State<Arc<ConversionJobService>>,
    axum::extract::Path(id): axum::extract::Path<String>,
    auth: Option<axum::Extension<AuthContext>>,
) -> impl axum::response::IntoResponse {
    use axum::{http::StatusCode, Json};

    // Get current entity
    let entity = match service.get_by_id(&id).await {
        Ok(Some(e)) => e,
        Ok(None) => return (StatusCode::NOT_FOUND, Json(ApiResponse::<ConversionJobResponseDto>::not_found("ConversionJob", &id))),
        Err(e) => return (StatusCode::INTERNAL_SERVER_ERROR, Json(ApiResponse::<ConversionJobResponseDto>::error(e.to_string()))),
    };

    // Check permission
    let Some(axum::Extension(auth)) = auth else {
        return (StatusCode::UNAUTHORIZED, Json(ApiResponse::<ConversionJobResponseDto>::error("A transition needs an authenticated caller")));
    };
    {
        let allowed_roles = ConversionJobTransition::Complete.allowed_roles();
        let granted = |required: &str| auth.permissions.iter().any(|p| {
            let (have, want): (Vec<&str>, Vec<&str>) = (p.split(':').collect(), required.split(':').collect());
            have.iter().enumerate().all(|(i, h)| *h == "*" || want.get(i) == Some(h))
                && (have.len() == want.len() || (have.len() < want.len() && have.last() == Some(&"*")))
        });
        let has_specific_perm = granted("conversion_job:transition:complete");
        let has_update_perm = granted("conversion_job:update");
        let has_role = auth.roles.iter().any(|r| allowed_roles.contains(&r.as_str()));
        if !has_specific_perm && !has_role {
            if !has_update_perm {
                return (StatusCode::FORBIDDEN, Json(ApiResponse::<ConversionJobResponseDto>::error("Insufficient permissions for complete transition")));
            }
            tracing::warn!(target: "backbone::write_guard", entity = "ConversionJob", verb = "complete", code = "transition_by_update_permission", "a transition granted only by conversion_job:update, running in shadow; it needs conversion_job:transition:complete or one of the roles system");
        }
    }

    // Create state machine from entity's actual status and validate transition
    let current_state: ConversionJobState = match entity.status.to_string().parse() {
        Ok(s) => s,
        Err(_) => return (StatusCode::CONFLICT, Json(ApiResponse::<ConversionJobResponseDto>::error("The stored state is not a state of this machine"))),
    };
    let sm = ConversionJobStateMachine::from_state(current_state);
    if !sm.can_transition(ConversionJobTransition::Complete) {
        return (StatusCode::BAD_REQUEST, Json(ApiResponse::<ConversionJobResponseDto>::error("Transition not allowed from current state")));
    }

    // Apply transition via partial update
    let mut fields: HashMap<String, serde_json::Value> = HashMap::new();
    fields.insert("status".to_string(), serde_json::Value::String("completed".to_string()));

    match backbone_core::write_guard::as_transition("complete", service.partial_update(&id, fields)).await {
        Ok(Some(updated)) => {
            let response: ConversionJobResponseDto = updated.into();
            (StatusCode::OK, Json(ApiResponse::ok(response)))
        }
        Ok(None) => (StatusCode::NOT_FOUND, Json(ApiResponse::<ConversionJobResponseDto>::not_found("ConversionJob", &id))),
        Err(e) => (StatusCode::INTERNAL_SERVER_ERROR, Json(ApiResponse::<ConversionJobResponseDto>::error(e.to_string()))),
    }
}

/// Execute fail transition on a ConversionJob.
///
/// POST /conversion_jobs/:id/transitions/fail
pub async fn fail_transition(
    axum::extract::State(service): axum::extract::State<Arc<ConversionJobService>>,
    axum::extract::Path(id): axum::extract::Path<String>,
    auth: Option<axum::Extension<AuthContext>>,
) -> impl axum::response::IntoResponse {
    use axum::{http::StatusCode, Json};

    // Get current entity
    let entity = match service.get_by_id(&id).await {
        Ok(Some(e)) => e,
        Ok(None) => return (StatusCode::NOT_FOUND, Json(ApiResponse::<ConversionJobResponseDto>::not_found("ConversionJob", &id))),
        Err(e) => return (StatusCode::INTERNAL_SERVER_ERROR, Json(ApiResponse::<ConversionJobResponseDto>::error(e.to_string()))),
    };

    // Check permission
    let Some(axum::Extension(auth)) = auth else {
        return (StatusCode::UNAUTHORIZED, Json(ApiResponse::<ConversionJobResponseDto>::error("A transition needs an authenticated caller")));
    };
    {
        let allowed_roles = ConversionJobTransition::Fail.allowed_roles();
        let granted = |required: &str| auth.permissions.iter().any(|p| {
            let (have, want): (Vec<&str>, Vec<&str>) = (p.split(':').collect(), required.split(':').collect());
            have.iter().enumerate().all(|(i, h)| *h == "*" || want.get(i) == Some(h))
                && (have.len() == want.len() || (have.len() < want.len() && have.last() == Some(&"*")))
        });
        let has_specific_perm = granted("conversion_job:transition:fail");
        let has_update_perm = granted("conversion_job:update");
        let has_role = auth.roles.iter().any(|r| allowed_roles.contains(&r.as_str()));
        if !has_specific_perm && !has_role {
            if !has_update_perm {
                return (StatusCode::FORBIDDEN, Json(ApiResponse::<ConversionJobResponseDto>::error("Insufficient permissions for fail transition")));
            }
            tracing::warn!(target: "backbone::write_guard", entity = "ConversionJob", verb = "fail", code = "transition_by_update_permission", "a transition granted only by conversion_job:update, running in shadow; it needs conversion_job:transition:fail or one of the roles system");
        }
    }

    // Create state machine from entity's actual status and validate transition
    let current_state: ConversionJobState = match entity.status.to_string().parse() {
        Ok(s) => s,
        Err(_) => return (StatusCode::CONFLICT, Json(ApiResponse::<ConversionJobResponseDto>::error("The stored state is not a state of this machine"))),
    };
    let sm = ConversionJobStateMachine::from_state(current_state);
    if !sm.can_transition(ConversionJobTransition::Fail) {
        return (StatusCode::BAD_REQUEST, Json(ApiResponse::<ConversionJobResponseDto>::error("Transition not allowed from current state")));
    }

    // Apply transition via partial update
    let mut fields: HashMap<String, serde_json::Value> = HashMap::new();
    fields.insert("status".to_string(), serde_json::Value::String("failed".to_string()));

    match backbone_core::write_guard::as_transition("fail", service.partial_update(&id, fields)).await {
        Ok(Some(updated)) => {
            let response: ConversionJobResponseDto = updated.into();
            (StatusCode::OK, Json(ApiResponse::ok(response)))
        }
        Ok(None) => (StatusCode::NOT_FOUND, Json(ApiResponse::<ConversionJobResponseDto>::not_found("ConversionJob", &id))),
        Err(e) => (StatusCode::INTERNAL_SERVER_ERROR, Json(ApiResponse::<ConversionJobResponseDto>::error(e.to_string()))),
    }
}

/// Execute cancel_pending transition on a ConversionJob.
///
/// POST /conversion_jobs/:id/transitions/cancel_pending
pub async fn cancel_pending_transition(
    axum::extract::State(service): axum::extract::State<Arc<ConversionJobService>>,
    axum::extract::Path(id): axum::extract::Path<String>,
    auth: Option<axum::Extension<AuthContext>>,
) -> impl axum::response::IntoResponse {
    use axum::{http::StatusCode, Json};

    // Get current entity
    let entity = match service.get_by_id(&id).await {
        Ok(Some(e)) => e,
        Ok(None) => return (StatusCode::NOT_FOUND, Json(ApiResponse::<ConversionJobResponseDto>::not_found("ConversionJob", &id))),
        Err(e) => return (StatusCode::INTERNAL_SERVER_ERROR, Json(ApiResponse::<ConversionJobResponseDto>::error(e.to_string()))),
    };

    // Check permission
    let Some(axum::Extension(auth)) = auth else {
        return (StatusCode::UNAUTHORIZED, Json(ApiResponse::<ConversionJobResponseDto>::error("A transition needs an authenticated caller")));
    };
    {
        let allowed_roles = ConversionJobTransition::CancelPending.allowed_roles();
        let granted = |required: &str| auth.permissions.iter().any(|p| {
            let (have, want): (Vec<&str>, Vec<&str>) = (p.split(':').collect(), required.split(':').collect());
            have.iter().enumerate().all(|(i, h)| *h == "*" || want.get(i) == Some(h))
                && (have.len() == want.len() || (have.len() < want.len() && have.last() == Some(&"*")))
        });
        let has_specific_perm = granted("conversion_job:transition:cancel_pending");
        let has_update_perm = granted("conversion_job:update");
        let has_role = auth.roles.iter().any(|r| allowed_roles.contains(&r.as_str()));
        if !has_specific_perm && !has_role {
            if !has_update_perm {
                return (StatusCode::FORBIDDEN, Json(ApiResponse::<ConversionJobResponseDto>::error("Insufficient permissions for cancel_pending transition")));
            }
            tracing::warn!(target: "backbone::write_guard", entity = "ConversionJob", verb = "cancel_pending", code = "transition_by_update_permission", "a transition granted only by conversion_job:update, running in shadow; it needs conversion_job:transition:cancel_pending or one of the roles owner, admin");
        }
    }

    // Create state machine from entity's actual status and validate transition
    let current_state: ConversionJobState = match entity.status.to_string().parse() {
        Ok(s) => s,
        Err(_) => return (StatusCode::CONFLICT, Json(ApiResponse::<ConversionJobResponseDto>::error("The stored state is not a state of this machine"))),
    };
    let sm = ConversionJobStateMachine::from_state(current_state);
    if !sm.can_transition(ConversionJobTransition::CancelPending) {
        return (StatusCode::BAD_REQUEST, Json(ApiResponse::<ConversionJobResponseDto>::error("Transition not allowed from current state")));
    }

    // Guard `$actor.id == source_file.owner_id || $actor.has_role('admin')` not compiled (`.owner_id` reads a relation or a duration); the transition is not checked against it.
    // Apply transition via partial update
    let mut fields: HashMap<String, serde_json::Value> = HashMap::new();
    fields.insert("status".to_string(), serde_json::Value::String("cancelled".to_string()));

    match backbone_core::write_guard::as_transition("cancel_pending", service.partial_update(&id, fields)).await {
        Ok(Some(updated)) => {
            let response: ConversionJobResponseDto = updated.into();
            (StatusCode::OK, Json(ApiResponse::ok(response)))
        }
        Ok(None) => (StatusCode::NOT_FOUND, Json(ApiResponse::<ConversionJobResponseDto>::not_found("ConversionJob", &id))),
        Err(e) => (StatusCode::INTERNAL_SERVER_ERROR, Json(ApiResponse::<ConversionJobResponseDto>::error(e.to_string()))),
    }
}

/// Execute cancel_running transition on a ConversionJob.
///
/// POST /conversion_jobs/:id/transitions/cancel_running
pub async fn cancel_running_transition(
    axum::extract::State(service): axum::extract::State<Arc<ConversionJobService>>,
    axum::extract::Path(id): axum::extract::Path<String>,
    auth: Option<axum::Extension<AuthContext>>,
) -> impl axum::response::IntoResponse {
    use axum::{http::StatusCode, Json};

    // Get current entity
    let entity = match service.get_by_id(&id).await {
        Ok(Some(e)) => e,
        Ok(None) => return (StatusCode::NOT_FOUND, Json(ApiResponse::<ConversionJobResponseDto>::not_found("ConversionJob", &id))),
        Err(e) => return (StatusCode::INTERNAL_SERVER_ERROR, Json(ApiResponse::<ConversionJobResponseDto>::error(e.to_string()))),
    };

    // Check permission
    let Some(axum::Extension(auth)) = auth else {
        return (StatusCode::UNAUTHORIZED, Json(ApiResponse::<ConversionJobResponseDto>::error("A transition needs an authenticated caller")));
    };
    {
        let allowed_roles = ConversionJobTransition::CancelRunning.allowed_roles();
        let granted = |required: &str| auth.permissions.iter().any(|p| {
            let (have, want): (Vec<&str>, Vec<&str>) = (p.split(':').collect(), required.split(':').collect());
            have.iter().enumerate().all(|(i, h)| *h == "*" || want.get(i) == Some(h))
                && (have.len() == want.len() || (have.len() < want.len() && have.last() == Some(&"*")))
        });
        let has_specific_perm = granted("conversion_job:transition:cancel_running");
        let has_update_perm = granted("conversion_job:update");
        let has_role = auth.roles.iter().any(|r| allowed_roles.contains(&r.as_str()));
        if !has_specific_perm && !has_role {
            if !has_update_perm {
                return (StatusCode::FORBIDDEN, Json(ApiResponse::<ConversionJobResponseDto>::error("Insufficient permissions for cancel_running transition")));
            }
            tracing::warn!(target: "backbone::write_guard", entity = "ConversionJob", verb = "cancel_running", code = "transition_by_update_permission", "a transition granted only by conversion_job:update, running in shadow; it needs conversion_job:transition:cancel_running or one of the roles owner, admin");
        }
    }

    // Create state machine from entity's actual status and validate transition
    let current_state: ConversionJobState = match entity.status.to_string().parse() {
        Ok(s) => s,
        Err(_) => return (StatusCode::CONFLICT, Json(ApiResponse::<ConversionJobResponseDto>::error("The stored state is not a state of this machine"))),
    };
    let sm = ConversionJobStateMachine::from_state(current_state);
    if !sm.can_transition(ConversionJobTransition::CancelRunning) {
        return (StatusCode::BAD_REQUEST, Json(ApiResponse::<ConversionJobResponseDto>::error("Transition not allowed from current state")));
    }

    // Guard `$actor.id == source_file.owner_id || $actor.has_role('admin')` not compiled (`.owner_id` reads a relation or a duration); the transition is not checked against it.
    // Apply transition via partial update
    let mut fields: HashMap<String, serde_json::Value> = HashMap::new();
    fields.insert("status".to_string(), serde_json::Value::String("cancelled".to_string()));

    match backbone_core::write_guard::as_transition("cancel_running", service.partial_update(&id, fields)).await {
        Ok(Some(updated)) => {
            let response: ConversionJobResponseDto = updated.into();
            (StatusCode::OK, Json(ApiResponse::ok(response)))
        }
        Ok(None) => (StatusCode::NOT_FOUND, Json(ApiResponse::<ConversionJobResponseDto>::not_found("ConversionJob", &id))),
        Err(e) => (StatusCode::INTERNAL_SERVER_ERROR, Json(ApiResponse::<ConversionJobResponseDto>::error(e.to_string()))),
    }
}

/// Execute retry transition on a ConversionJob.
///
/// POST /conversion_jobs/:id/transitions/retry
pub async fn retry_transition(
    axum::extract::State(service): axum::extract::State<Arc<ConversionJobService>>,
    axum::extract::Path(id): axum::extract::Path<String>,
    auth: Option<axum::Extension<AuthContext>>,
) -> impl axum::response::IntoResponse {
    use axum::{http::StatusCode, Json};

    // Get current entity
    let entity = match service.get_by_id(&id).await {
        Ok(Some(e)) => e,
        Ok(None) => return (StatusCode::NOT_FOUND, Json(ApiResponse::<ConversionJobResponseDto>::not_found("ConversionJob", &id))),
        Err(e) => return (StatusCode::INTERNAL_SERVER_ERROR, Json(ApiResponse::<ConversionJobResponseDto>::error(e.to_string()))),
    };

    // Check permission
    let Some(axum::Extension(auth)) = auth else {
        return (StatusCode::UNAUTHORIZED, Json(ApiResponse::<ConversionJobResponseDto>::error("A transition needs an authenticated caller")));
    };
    {
        let allowed_roles = ConversionJobTransition::Retry.allowed_roles();
        let granted = |required: &str| auth.permissions.iter().any(|p| {
            let (have, want): (Vec<&str>, Vec<&str>) = (p.split(':').collect(), required.split(':').collect());
            have.iter().enumerate().all(|(i, h)| *h == "*" || want.get(i) == Some(h))
                && (have.len() == want.len() || (have.len() < want.len() && have.last() == Some(&"*")))
        });
        let has_specific_perm = granted("conversion_job:transition:retry");
        let has_update_perm = granted("conversion_job:update");
        let has_role = auth.roles.iter().any(|r| allowed_roles.contains(&r.as_str()));
        if !has_specific_perm && !has_role {
            if !has_update_perm {
                return (StatusCode::FORBIDDEN, Json(ApiResponse::<ConversionJobResponseDto>::error("Insufficient permissions for retry transition")));
            }
            tracing::warn!(target: "backbone::write_guard", entity = "ConversionJob", verb = "retry", code = "transition_by_update_permission", "a transition granted only by conversion_job:update, running in shadow; it needs conversion_job:transition:retry or one of the roles system, owner");
        }
    }

    // Create state machine from entity's actual status and validate transition
    let current_state: ConversionJobState = match entity.status.to_string().parse() {
        Ok(s) => s,
        Err(_) => return (StatusCode::CONFLICT, Json(ApiResponse::<ConversionJobResponseDto>::error("The stored state is not a state of this machine"))),
    };
    let sm = ConversionJobStateMachine::from_state(current_state);
    if !sm.can_transition(ConversionJobTransition::Retry) {
        return (StatusCode::BAD_REQUEST, Json(ApiResponse::<ConversionJobResponseDto>::error("Transition not allowed from current state")));
    }

    // Guard `retry_count < 3` not compiled (`retry_count` is not a field of ConversionJob); the transition is not checked against it.
    // Apply transition via partial update
    let mut fields: HashMap<String, serde_json::Value> = HashMap::new();
    fields.insert("status".to_string(), serde_json::Value::String("pending".to_string()));

    match backbone_core::write_guard::as_transition("retry", service.partial_update(&id, fields)).await {
        Ok(Some(updated)) => {
            let response: ConversionJobResponseDto = updated.into();
            (StatusCode::OK, Json(ApiResponse::ok(response)))
        }
        Ok(None) => (StatusCode::NOT_FOUND, Json(ApiResponse::<ConversionJobResponseDto>::not_found("ConversionJob", &id))),
        Err(e) => (StatusCode::INTERNAL_SERVER_ERROR, Json(ApiResponse::<ConversionJobResponseDto>::error(e.to_string()))),
    }
}

/// Execute reconvert transition on a ConversionJob.
///
/// POST /conversion_jobs/:id/transitions/reconvert
pub async fn reconvert_transition(
    axum::extract::State(service): axum::extract::State<Arc<ConversionJobService>>,
    axum::extract::Path(id): axum::extract::Path<String>,
    auth: Option<axum::Extension<AuthContext>>,
) -> impl axum::response::IntoResponse {
    use axum::{http::StatusCode, Json};

    // Get current entity
    let entity = match service.get_by_id(&id).await {
        Ok(Some(e)) => e,
        Ok(None) => return (StatusCode::NOT_FOUND, Json(ApiResponse::<ConversionJobResponseDto>::not_found("ConversionJob", &id))),
        Err(e) => return (StatusCode::INTERNAL_SERVER_ERROR, Json(ApiResponse::<ConversionJobResponseDto>::error(e.to_string()))),
    };

    // Check permission
    let Some(axum::Extension(auth)) = auth else {
        return (StatusCode::UNAUTHORIZED, Json(ApiResponse::<ConversionJobResponseDto>::error("A transition needs an authenticated caller")));
    };
    {
        let allowed_roles = ConversionJobTransition::Reconvert.allowed_roles();
        let granted = |required: &str| auth.permissions.iter().any(|p| {
            let (have, want): (Vec<&str>, Vec<&str>) = (p.split(':').collect(), required.split(':').collect());
            have.iter().enumerate().all(|(i, h)| *h == "*" || want.get(i) == Some(h))
                && (have.len() == want.len() || (have.len() < want.len() && have.last() == Some(&"*")))
        });
        let has_specific_perm = granted("conversion_job:transition:reconvert");
        let has_update_perm = granted("conversion_job:update");
        let has_role = auth.roles.iter().any(|r| allowed_roles.contains(&r.as_str()));
        if !has_specific_perm && !has_role {
            if !has_update_perm {
                return (StatusCode::FORBIDDEN, Json(ApiResponse::<ConversionJobResponseDto>::error("Insufficient permissions for reconvert transition")));
            }
            tracing::warn!(target: "backbone::write_guard", entity = "ConversionJob", verb = "reconvert", code = "transition_by_update_permission", "a transition granted only by conversion_job:update, running in shadow; it needs conversion_job:transition:reconvert or one of the roles owner, admin");
        }
    }

    // Create state machine from entity's actual status and validate transition
    let current_state: ConversionJobState = match entity.status.to_string().parse() {
        Ok(s) => s,
        Err(_) => return (StatusCode::CONFLICT, Json(ApiResponse::<ConversionJobResponseDto>::error("The stored state is not a state of this machine"))),
    };
    let sm = ConversionJobStateMachine::from_state(current_state);
    if !sm.can_transition(ConversionJobTransition::Reconvert) {
        return (StatusCode::BAD_REQUEST, Json(ApiResponse::<ConversionJobResponseDto>::error("Transition not allowed from current state")));
    }

    // Apply transition via partial update
    let mut fields: HashMap<String, serde_json::Value> = HashMap::new();
    fields.insert("status".to_string(), serde_json::Value::String("pending".to_string()));

    match backbone_core::write_guard::as_transition("reconvert", service.partial_update(&id, fields)).await {
        Ok(Some(updated)) => {
            let response: ConversionJobResponseDto = updated.into();
            (StatusCode::OK, Json(ApiResponse::ok(response)))
        }
        Ok(None) => (StatusCode::NOT_FOUND, Json(ApiResponse::<ConversionJobResponseDto>::not_found("ConversionJob", &id))),
        Err(e) => (StatusCode::INTERNAL_SERVER_ERROR, Json(ApiResponse::<ConversionJobResponseDto>::error(e.to_string()))),
    }
}

/// Create routes for state transitions.
pub fn create_conversion_job_transition_routes(service: Arc<ConversionJobService>) -> Router {
    use axum::routing::post;

    Router::new()
        .route("/conversion_jobs/:id/transitions/start", post(start_transition))
        .route("/conversion_jobs/:id/transitions/update_progress", post(update_progress_transition))
        .route("/conversion_jobs/:id/transitions/complete", post(complete_transition))
        .route("/conversion_jobs/:id/transitions/fail", post(fail_transition))
        .route("/conversion_jobs/:id/transitions/cancel_pending", post(cancel_pending_transition))
        .route("/conversion_jobs/:id/transitions/cancel_running", post(cancel_running_transition))
        .route("/conversion_jobs/:id/transitions/retry", post(retry_transition))
        .route("/conversion_jobs/:id/transitions/reconvert", post(reconvert_transition))
        .with_state(service)
}