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use std::cell::RefCell;

use crate::{
    crossterm::event::Event, listbox, pane::Pane, snapshot::Snapshot, suggest::Suggest,
    switch::ActiveKeySwitcher, text, text_editor, validate::ValidatorManager, PaneFactory,
    PromptSignal,
};

use super::keymap;

/// A `Renderer` for the readline preset, responsible for managing the rendering process.
/// It holds references to various components and their states, facilitating the rendering of the readline interface.
pub struct Renderer {
    /// Manages key bindings and their associated actions within the readline interface.
    pub keymap: RefCell<ActiveKeySwitcher<keymap::Keymap>>,
    /// Holds a snapshot of the title's renderer state, used for rendering the title section.
    pub title_snapshot: Snapshot<text::State>,
    /// Holds a snapshot of the text editor's renderer state, used for rendering the text input area.
    pub text_editor_snapshot: Snapshot<text_editor::State>,
    /// Optional suggest component for autocomplete functionality.
    pub suggest: Option<Suggest>,
    /// Holds a snapshot of the suggest box's renderer state, used when rendering suggestions for autocomplete.
    pub suggest_snapshot: Snapshot<listbox::State>,
    /// Optional validator manager for input validation.
    pub validator: Option<ValidatorManager<str>>,
    /// Holds a snapshot of the error message's renderer state, used for rendering error messages.
    pub error_message_snapshot: Snapshot<text::State>,
}

impl crate::Finalizer for Renderer {
    type Return = String;

    fn finalize(&self) -> anyhow::Result<Self::Return> {
        Ok(self
            .text_editor_snapshot
            .after()
            .texteditor
            .text_without_cursor()
            .to_string())
    }
}

impl crate::Renderer for Renderer {
    fn create_panes(&self, width: u16, height: u16) -> Vec<Pane> {
        vec![
            self.title_snapshot.create_pane(width, height),
            self.error_message_snapshot.create_pane(width, height),
            self.text_editor_snapshot.create_pane(width, height),
            self.suggest_snapshot.create_pane(width, height),
        ]
    }

    fn evaluate(&mut self, event: &Event) -> anyhow::Result<PromptSignal> {
        let keymap = *self.keymap.borrow_mut().get();
        keymap(event, self)
    }
}