//! Maps parsed `/` slash commands into one or more `Action` variants
//! that `apply_action` can process.
use crate::controller::command::Command;
use crate::app::runtime::actions::Action;
use crate::app::state::types::Overlay;

/// Convert a parsed `Command` into the corresponding sequence of `Action`s.
///
/// Flow: match each `Command` variant to its handler — most produce a
/// single `Action` (open an overlay, dispatch an OAuth flow, open the
/// editor, etc.); some produce an `Action::SystemNote` for errors or
/// informational responses.
///
/// Return: a `Vec<Action>` (always non-empty) to be applied sequentially
/// by `apply_action`.
pub fn apply_command(command: Command) -> Vec<Action> {
    match command {
        Command::Help => {
            vec![Action::OpenOverlay(Overlay::Help)]
        }
        Command::Quit => {
            vec![Action::QuitConfirm]
        }
        Command::LessonCreate(text) => {
            vec![Action::SystemNote {
                kind: "lesson".to_string(),
                message: format!("/lesson {}", text),
            }]
        }
        Command::LessonExport(path) => {
            vec![Action::LessonExport { path }]
        }
        Command::LessonImport(path) => {
            vec![Action::LessonImport { path }]
        }
        Command::LessonList => {
            vec![Action::OpenOverlay(Overlay::Learning)]
        }
        Command::LessonAccept(name) => {
            vec![Action::LessonAccept { name }]
        }
        Command::LessonReject(name) => {
            vec![Action::LessonReject { name }]
        }
        Command::Mode(mode) => {
            vec![Action::SwitchMode(mode)]
        }
        Command::ClearConfirm => {
            vec![Action::OpenOverlay(Overlay::ClearConfirm)]
        }
        Command::Clear => {
            vec![Action::SystemNote {
                kind: "clear".to_string(),
                message: "transcript cleared".to_string(),
            }]
        }
        Command::Login { provider } if provider.is_empty() => {
            vec![Action::SystemNote {
                kind: "error".to_string(),
                message: "Usage: /login <provider>".to_string(),
            }]
        }
        Command::Login { provider } => {
            vec![Action::StartOAuth { provider }]
        }
        Command::Edit(path) if path == "." || path.is_empty() => {
            vec![Action::SystemNote {
                kind: "info".to_string(),
                message: "Usage: /edit <path>\nOpens a file for inline editing.\nExample: /edit src/main.rs".to_string(),
            }]
        }
        Command::Edit(path) => {
            vec![Action::OpenEditor { path }]
        }
        Command::McpAdd { name, command } => {
            vec![Action::McpAdd { name, command }]
        }
        Command::ModelList => {
            vec![Action::ModelList]
        }
        Command::Compact => {
            vec![Action::Compact]
        }
        Command::WorkflowOpen => {
            vec![Action::OpenOverlay(Overlay::Workflow)]
        }
        Command::WorkflowRun { script } => {
            vec![Action::RunWorkflow { script }]
        }
        Command::Unknown(cmd) => {
            vec![Action::SystemNote {
                kind: "error".to_string(),
                message: format!("unknown command: {}", cmd),
            }]
        }
    }
}