//! Events fed into the application's update function.
//!
//! `AppEvent` is the single input type the runtime delivers to
//! `App::update`. Synthetic instances drive Tier 3 integration
//! tests (see ADR-0008), so the type is plain data with no
//! runtime dependency.

use crossterm::event::KeyEvent;

use crate::db::{DataResult, DeleteResult, InsertResult, TableDescription, UpdateResult};
use crate::dsl::Command;

#[derive(Debug, Clone)]
pub enum AppEvent {
    Key(KeyEvent),
    Resize {
        cols: u16,
        rows: u16,
    },
    Tick,
    /// A DSL command finished successfully. `description` is
    /// `Some` for commands that produce a table view (create,
    /// add column) and `None` for commands that don't (drop).
    DslSucceeded {
        command: Command,
        description: Option<TableDescription>,
    },
    /// A `show data` query succeeded.
    DslDataSucceeded { command: Command, data: DataResult },
    DslInsertSucceeded {
        command: Command,
        result: InsertResult,
    },
    DslUpdateSucceeded {
        command: Command,
        result: UpdateResult,
    },
    DslDeleteSucceeded {
        command: Command,
        result: DeleteResult,
    },
    /// A DSL command failed. `error` is already a friendly
    /// message produced via `DbError::friendly_message`.
    DslFailed {
        command: Command,
        error: String,
    },
    /// Refreshed list of tables in the database.
    TablesRefreshed(Vec<String>),
    /// A persistence failure occurred (ADR-0015 §8). The
    /// application surfaces a fatal banner and exits cleanly so
    /// the message remains above the shell prompt.
    PersistenceFatal {
        operation: String,
        path: std::path::PathBuf,
        message: String,
    },
}