mod slash_command_registry;

use anyhow::Result;
use gpui::{AnyElement, AppContext, ElementId, SharedString, Task, WeakView, WindowContext};
use language::{CodeLabel, LspAdapterDelegate};
use serde::{Deserialize, Serialize};
pub use slash_command_registry::*;
use std::{
    ops::Range,
    sync::{atomic::AtomicBool, Arc},
};
use workspace::{ui::IconName, Workspace};

pub fn init(cx: &mut AppContext) {
    SlashCommandRegistry::default_global(cx);
}

#[derive(Debug)]
pub struct ArgumentCompletion {
    /// The label to display for this completion.
    pub label: String,
    /// The new text that should be inserted into the command when this completion is accepted.
    pub new_text: String,
    /// Whether the command should be run when accepting this completion.
    pub run_command: bool,
}

pub trait SlashCommand: 'static + Send + Sync {
    fn name(&self) -> String;
    fn label(&self, _cx: &AppContext) -> CodeLabel {
        CodeLabel::plain(self.name(), None)
    }
    fn description(&self) -> String;
    fn menu_text(&self) -> String;
    fn complete_argument(
        self: Arc<Self>,
        query: String,
        cancel: Arc<AtomicBool>,
        workspace: Option<WeakView<Workspace>>,
        cx: &mut WindowContext,
    ) -> Task<Result<Vec<ArgumentCompletion>>>;
    fn requires_argument(&self) -> bool;
    fn run(
        self: Arc<Self>,
        argument: Option<&str>,
        workspace: WeakView<Workspace>,
        // TODO: We're just using the `LspAdapterDelegate` here because that is
        // what the extension API is already expecting.
        //
        // It may be that `LspAdapterDelegate` needs a more general name, or
        // perhaps another kind of delegate is needed here.
        delegate: Option<Arc<dyn LspAdapterDelegate>>,
        cx: &mut WindowContext,
    ) -> Task<Result<SlashCommandOutput>>;
}

pub type RenderFoldPlaceholder = Arc<
    dyn Send
        + Sync
        + Fn(ElementId, Arc<dyn Fn(&mut WindowContext)>, &mut WindowContext) -> AnyElement,
>;

#[derive(Debug, Default)]
pub struct SlashCommandOutput {
    pub text: String,
    pub sections: Vec<SlashCommandOutputSection<usize>>,
    pub run_commands_in_text: bool,
}

#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
pub struct SlashCommandOutputSection<T> {
    pub range: Range<T>,
    pub icon: IconName,
    pub label: SharedString,
}