backbone_bucket/presentation/http/

file_comment_handler.rs

//! FileComment 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)
#[cfg(feature = "auth")]
use backbone_auth::middleware::AuthContext;
#[cfg(feature = "auth")]
use backbone_auth::AuthMiddleware;

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

// DTO imports
use crate::presentation::dto::{CreateFileCommentDto, UpdateFileCommentDto, PatchFileCommentDto, FileCommentResponseDto};

use crate::domain::state_machine::{FileCommentState, FileCommentStateMachine, FileCommentTransition};

/// Application error type
#[derive(Debug, thiserror::Error)]
pub enum FileCommentError {
    #[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("File must exist: {0}")]
    FileNotFound(String),
    #[error("File must be accessible: {0}")]
    FileNotAccessible(String),
    #[error("Comment content is required: {0}")]
    EmptyComment(String),
    #[error("Comment content max 10000 characters: {0}")]
    CommentTooLong(String),
    #[error("Parent comment must exist if provided: {0}")]
    InvalidParentComment(String),
    #[error("All mentioned users must exist: {0}")]
    InvalidMention(String),
    #[error("Annotation region must be valid JSON: {0}")]
    InvalidAnnotation(String),
    #[error("Only comment owner can edit: {0}")]
    NotCommentOwner(String),
    #[error("Cannot edit deleted comment: {0}")]
    CommentDeleted(String),
    #[error("Cannot edit resolved comment after 5 minutes: {0}")]
    EditTimeout(String),
    #[error("Maximum thread depth exceeded: {0}")]
    MaxThreadDepthExceeded(String),
}

impl From<ServiceError> for FileCommentError {
    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 FileCommentError {
    fn into_response(self) -> axum::response::Response {
        use axum::http::StatusCode;
        use axum::Json;

        let (status, code) = match &self {
            Self::NotFound(_) => (StatusCode::NOT_FOUND, "FILECOMMENT_NOT_FOUND"),
            Self::Validation(_) => (StatusCode::BAD_REQUEST, "FILECOMMENT_VALIDATION_ERROR"),
            Self::Database(_) => (StatusCode::INTERNAL_SERVER_ERROR, "FILECOMMENT_DATABASE_ERROR"),
            Self::Internal(_) => (StatusCode::INTERNAL_SERVER_ERROR, "FILECOMMENT_INTERNAL_ERROR"),
            Self::FileNotFound(_) => (StatusCode::UNPROCESSABLE_ENTITY, "FILECOMMENT_FILE_NOT_FOUND"),
            Self::FileNotAccessible(_) => (StatusCode::UNPROCESSABLE_ENTITY, "FILECOMMENT_FILE_NOT_ACCESSIBLE"),
            Self::EmptyComment(_) => (StatusCode::UNPROCESSABLE_ENTITY, "FILECOMMENT_EMPTY_COMMENT"),
            Self::CommentTooLong(_) => (StatusCode::UNPROCESSABLE_ENTITY, "FILECOMMENT_COMMENT_TOO_LONG"),
            Self::InvalidParentComment(_) => (StatusCode::UNPROCESSABLE_ENTITY, "FILECOMMENT_INVALID_PARENT_COMMENT"),
            Self::InvalidMention(_) => (StatusCode::UNPROCESSABLE_ENTITY, "FILECOMMENT_INVALID_MENTION"),
            Self::InvalidAnnotation(_) => (StatusCode::UNPROCESSABLE_ENTITY, "FILECOMMENT_INVALID_ANNOTATION"),
            Self::NotCommentOwner(_) => (StatusCode::UNPROCESSABLE_ENTITY, "FILECOMMENT_NOT_COMMENT_OWNER"),
            Self::CommentDeleted(_) => (StatusCode::UNPROCESSABLE_ENTITY, "FILECOMMENT_COMMENT_DELETED"),
            Self::EditTimeout(_) => (StatusCode::UNPROCESSABLE_ENTITY, "FILECOMMENT_EDIT_TIMEOUT"),
            Self::MaxThreadDepthExceeded(_) => (StatusCode::UNPROCESSABLE_ENTITY, "FILECOMMENT_MAX_THREAD_DEPTH_EXCEEDED"),
        };

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

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

/// Domain-specific error codes for FileComment
pub mod file_comment_errors {
    pub const FILE_NOT_FOUND: &str = "FILECOMMENT_FILE_NOT_FOUND";
    pub const FILE_NOT_ACCESSIBLE: &str = "FILECOMMENT_FILE_NOT_ACCESSIBLE";
    pub const EMPTY_COMMENT: &str = "FILECOMMENT_EMPTY_COMMENT";
    pub const COMMENT_TOO_LONG: &str = "FILECOMMENT_COMMENT_TOO_LONG";
    pub const INVALID_PARENT_COMMENT: &str = "FILECOMMENT_INVALID_PARENT_COMMENT";
    pub const INVALID_MENTION: &str = "FILECOMMENT_INVALID_MENTION";
    pub const INVALID_ANNOTATION: &str = "FILECOMMENT_INVALID_ANNOTATION";
    pub const NOT_COMMENT_OWNER: &str = "FILECOMMENT_NOT_COMMENT_OWNER";
    pub const COMMENT_DELETED: &str = "FILECOMMENT_COMMENT_DELETED";
    pub const EDIT_TIMEOUT: &str = "FILECOMMENT_EDIT_TIMEOUT";
    pub const MAX_THREAD_DEPTH_EXCEEDED: &str = "FILECOMMENT_MAX_THREAD_DEPTH_EXCEEDED";
}

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

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

/// Create Axum router with only the read (GET) endpoints for FileComment.
///
/// Safe for public, unauthenticated exposure (e.g., reference data).
/// Mutations must be served separately via `create_file_comment_write_routes`,
/// typically wrapped in an auth middleware layer.
pub fn create_file_comment_read_routes(service: Arc<FileCommentService>) -> Router {
    BackboneCrudHandler::<FileCommentService, FileComment, CreateFileCommentDto, UpdateFileCommentDto, FileCommentResponseDto>::read_routes(
        service,
        "/file_comments",
    )
}

/// Create Axum router with only the write (mutation) endpoints for FileComment.
///
/// 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_file_comment_write_routes(service: Arc<FileCommentService>) -> Router {
    BackboneCrudHandler::<FileCommentService, FileComment, CreateFileCommentDto, UpdateFileCommentDto, FileCommentResponseDto>::write_routes(
        service,
        "/file_comments",
    )
}

/// 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_file_comment_routes<A: AuthMiddleware + Send + Sync + 'static>(
    service: Arc<FileCommentService>,
    auth: Arc<A>,
) -> Router {
    use axum::middleware;
    use axum::response::IntoResponse;

    let auth_layer = auth.clone();
    create_file_comment_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 resolve transition on a FileComment.
///
/// POST /file_comments/:id/transitions/resolve
pub async fn resolve_transition(
    axum::extract::State(service): axum::extract::State<Arc<FileCommentService>>,
    axum::extract::Path(id): axum::extract::Path<String>,
    #[cfg(feature = "auth")] axum::Extension(auth): 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::<FileCommentResponseDto>::not_found("FileComment", &id))),
        Err(e) => return (StatusCode::INTERNAL_SERVER_ERROR, Json(ApiResponse::<FileCommentResponseDto>::error(e.to_string()))),
    };

    // Check permission (if auth enabled)
    #[cfg(feature = "auth")]
    {
        let allowed_roles = FileCommentTransition::Resolve.allowed_roles();
        let has_specific_perm = auth.permissions.iter().any(|p| p == "file_comment:transition:resolve");
        let has_update_perm = auth.permissions.iter().any(|p| p == "file_comment: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::<FileCommentResponseDto>::error("Insufficient permissions for resolve transition")));
            }
            tracing::warn!(target: "backbone::write_guard", entity = "FileComment", verb = "resolve", code = "transition_by_update_permission", "a transition granted only by file_comment:update, running in shadow; it needs file_comment:transition:resolve or a role of ["owner", "file_owner"]");
        }
    }

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

    // Guard `$actor.id == user_id || $actor.id == file.owner_id` 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("resolved".to_string()));

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

/// Execute edit transition on a FileComment.
///
/// POST /file_comments/:id/transitions/edit
pub async fn edit_transition(
    axum::extract::State(service): axum::extract::State<Arc<FileCommentService>>,
    axum::extract::Path(id): axum::extract::Path<String>,
    #[cfg(feature = "auth")] axum::Extension(auth): 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::<FileCommentResponseDto>::not_found("FileComment", &id))),
        Err(e) => return (StatusCode::INTERNAL_SERVER_ERROR, Json(ApiResponse::<FileCommentResponseDto>::error(e.to_string()))),
    };

    // Check permission (if auth enabled)
    #[cfg(feature = "auth")]
    {
        let allowed_roles = FileCommentTransition::Edit.allowed_roles();
        let has_specific_perm = auth.permissions.iter().any(|p| p == "file_comment:transition:edit");
        let has_update_perm = auth.permissions.iter().any(|p| p == "file_comment: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::<FileCommentResponseDto>::error("Insufficient permissions for edit transition")));
            }
            tracing::warn!(target: "backbone::write_guard", entity = "FileComment", verb = "edit", code = "transition_by_update_permission", "a transition granted only by file_comment:update, running in shadow; it needs file_comment:transition:edit or a role of ["owner"]");
        }
    }

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

    // Guard `$actor.id == user_id` not compiled (reads the writer, the time or the row before the write); 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("active".to_string()));

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

/// Execute delete_active transition on a FileComment.
///
/// POST /file_comments/:id/transitions/delete_active
pub async fn delete_active_transition(
    axum::extract::State(service): axum::extract::State<Arc<FileCommentService>>,
    axum::extract::Path(id): axum::extract::Path<String>,
    #[cfg(feature = "auth")] axum::Extension(auth): 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::<FileCommentResponseDto>::not_found("FileComment", &id))),
        Err(e) => return (StatusCode::INTERNAL_SERVER_ERROR, Json(ApiResponse::<FileCommentResponseDto>::error(e.to_string()))),
    };

    // Check permission (if auth enabled)
    #[cfg(feature = "auth")]
    {
        let allowed_roles = FileCommentTransition::DeleteActive.allowed_roles();
        let has_specific_perm = auth.permissions.iter().any(|p| p == "file_comment:transition:delete_active");
        let has_update_perm = auth.permissions.iter().any(|p| p == "file_comment: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::<FileCommentResponseDto>::error("Insufficient permissions for delete_active transition")));
            }
            tracing::warn!(target: "backbone::write_guard", entity = "FileComment", verb = "delete_active", code = "transition_by_update_permission", "a transition granted only by file_comment:update, running in shadow; it needs file_comment:transition:delete_active or a role of ["owner", "file_owner"]");
        }
    }

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

    // Guard `$actor.id == user_id || $actor.id == file.owner_id` 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("deleted".to_string()));

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

/// Execute reopen transition on a FileComment.
///
/// POST /file_comments/:id/transitions/reopen
pub async fn reopen_transition(
    axum::extract::State(service): axum::extract::State<Arc<FileCommentService>>,
    axum::extract::Path(id): axum::extract::Path<String>,
    #[cfg(feature = "auth")] axum::Extension(auth): 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::<FileCommentResponseDto>::not_found("FileComment", &id))),
        Err(e) => return (StatusCode::INTERNAL_SERVER_ERROR, Json(ApiResponse::<FileCommentResponseDto>::error(e.to_string()))),
    };

    // Check permission (if auth enabled)
    #[cfg(feature = "auth")]
    {
        let allowed_roles = FileCommentTransition::Reopen.allowed_roles();
        let has_specific_perm = auth.permissions.iter().any(|p| p == "file_comment:transition:reopen");
        let has_update_perm = auth.permissions.iter().any(|p| p == "file_comment: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::<FileCommentResponseDto>::error("Insufficient permissions for reopen transition")));
            }
            tracing::warn!(target: "backbone::write_guard", entity = "FileComment", verb = "reopen", code = "transition_by_update_permission", "a transition granted only by file_comment:update, running in shadow; it needs file_comment:transition:reopen or a role of ["user"]");
        }
    }

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

    // Guard `has_file_access($actor.id, file_id)` not compiled (`has_file_access()` is not a row-rule function); 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("active".to_string()));

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

/// Execute delete_resolved transition on a FileComment.
///
/// POST /file_comments/:id/transitions/delete_resolved
pub async fn delete_resolved_transition(
    axum::extract::State(service): axum::extract::State<Arc<FileCommentService>>,
    axum::extract::Path(id): axum::extract::Path<String>,
    #[cfg(feature = "auth")] axum::Extension(auth): 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::<FileCommentResponseDto>::not_found("FileComment", &id))),
        Err(e) => return (StatusCode::INTERNAL_SERVER_ERROR, Json(ApiResponse::<FileCommentResponseDto>::error(e.to_string()))),
    };

    // Check permission (if auth enabled)
    #[cfg(feature = "auth")]
    {
        let allowed_roles = FileCommentTransition::DeleteResolved.allowed_roles();
        let has_specific_perm = auth.permissions.iter().any(|p| p == "file_comment:transition:delete_resolved");
        let has_update_perm = auth.permissions.iter().any(|p| p == "file_comment: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::<FileCommentResponseDto>::error("Insufficient permissions for delete_resolved transition")));
            }
            tracing::warn!(target: "backbone::write_guard", entity = "FileComment", verb = "delete_resolved", code = "transition_by_update_permission", "a transition granted only by file_comment:update, running in shadow; it needs file_comment:transition:delete_resolved or a role of ["owner", "file_owner"]");
        }
    }

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

    // Guard `$actor.id == user_id || $actor.id == file.owner_id` 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("deleted".to_string()));

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

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

    Router::new()
        .route("/file_comments/:id/transitions/resolve", post(resolve_transition))
        .route("/file_comments/:id/transitions/edit", post(edit_transition))
        .route("/file_comments/:id/transitions/delete_active", post(delete_active_transition))
        .route("/file_comments/:id/transitions/reopen", post(reopen_transition))
        .route("/file_comments/:id/transitions/delete_resolved", post(delete_resolved_transition))
        .with_state(service)
}