use erp_core::error::AppError;

/// Workflow module error types.
#[derive(Debug, thiserror::Error)]
pub enum WorkflowError {
    #[error("验证失败: {0}")]
    Validation(String),

    #[error("资源未找到: {0}")]
    NotFound(String),

    #[error("流程定义已存在: {0}")]
    DuplicateDefinition(String),

    #[error("流程图无效: {0}")]
    InvalidDiagram(String),

    #[error("流程状态错误: {0}")]
    InvalidState(String),

    #[error("表达式求值失败: {0}")]
    ExpressionError(String),

    #[error("版本冲突: 数据已被其他操作修改，请刷新后重试")]
    VersionMismatch,
}

impl From<sea_orm::TransactionError<WorkflowError>> for WorkflowError {
    fn from(err: sea_orm::TransactionError<WorkflowError>) -> Self {
        match err {
            sea_orm::TransactionError::Connection(err) => {
                WorkflowError::Validation(err.to_string())
            }
            sea_orm::TransactionError::Transaction(inner) => inner,
        }
    }
}

impl From<WorkflowError> for AppError {
    fn from(err: WorkflowError) -> Self {
        match err {
            WorkflowError::Validation(s) => AppError::Validation(s),
            WorkflowError::NotFound(s) => AppError::NotFound(s),
            WorkflowError::DuplicateDefinition(s) => AppError::Conflict(s),
            WorkflowError::InvalidDiagram(s) => AppError::Validation(s),
            WorkflowError::InvalidState(s) => AppError::Validation(s),
            WorkflowError::ExpressionError(s) => AppError::Validation(s),
            WorkflowError::VersionMismatch => AppError::VersionMismatch,
        }
    }
}

pub type WorkflowResult<T> = Result<T, WorkflowError>;