use std::cell::RefCell;
use std::time::{Duration, Instant};

use cagire_ratatui::Sparkles;
use tachyonfx::{fx, Effect, EffectManager, Interpolation};

use crate::page::Page;
use crate::state::effects::FxId;
use crate::state::{ColorScheme, Modal};

#[derive(Debug, Clone, Copy, Default, PartialEq, Eq)]
pub enum FlashKind {
    #[default]
    Success,
    Error,
    Info,
}

#[derive(Debug, Default, Clone, Copy, PartialEq, Eq)]
pub enum DictFocus {
    #[default]
    Categories,
    Words,
}

#[derive(Debug, Default, Clone, Copy, PartialEq, Eq)]
pub enum HelpFocus {
    #[default]
    Topics,
    Content,
}

pub struct UiState {
    pub sparkles: Sparkles,
    pub status_message: Option<String>,
    pub flash_until: Option<Instant>,
    pub flash_kind: FlashKind,
    pub modal: Modal,
    pub help_focus: HelpFocus,
    pub help_topic: usize,
    pub help_scrolls: Vec<usize>,
    pub help_search_active: bool,
    pub help_search_query: String,
    pub dict_focus: DictFocus,
    pub dict_category: usize,
    pub dict_scrolls: Vec<usize>,
    pub dict_search_query: String,
    pub dict_search_active: bool,
    pub show_title: bool,
    pub runtime_highlight: bool,
    pub show_completion: bool,
    pub minimap_until: Option<Instant>,
    pub color_scheme: ColorScheme,
    pub hue_rotation: f32,
    pub effects: RefCell<EffectManager<FxId>>,
    pub modal_fx: RefCell<Option<Effect>>,
    pub title_fx: RefCell<Option<Effect>>,
    pub prev_modal_open: bool,
    pub prev_page: Page,
    pub prev_show_title: bool,
}

impl Default for UiState {
    fn default() -> Self {
        Self {
            sparkles: Sparkles::default(),
            status_message: None,
            flash_until: None,
            flash_kind: FlashKind::Success,
            modal: Modal::None,
            help_focus: HelpFocus::default(),
            help_topic: 0,
            help_scrolls: vec![0; crate::model::docs::topic_count()],
            help_search_active: false,
            help_search_query: String::new(),
            dict_focus: DictFocus::default(),
            dict_category: 0,
            dict_scrolls: vec![0; crate::model::categories::category_count()],
            dict_search_query: String::new(),
            dict_search_active: false,
            show_title: true,
            runtime_highlight: false,
            show_completion: true,
            minimap_until: None,
            color_scheme: ColorScheme::default(),
            hue_rotation: 0.0,
            effects: RefCell::new(EffectManager::default()),
            modal_fx: RefCell::new(None),
            title_fx: RefCell::new(Some(fx::coalesce((400, Interpolation::QuadOut)))),
            prev_modal_open: false,
            prev_page: Page::default(),
            prev_show_title: true,
        }
    }
}

impl UiState {
    pub fn help_scroll(&self) -> usize {
        self.help_scrolls[self.help_topic]
    }

    pub fn help_scroll_mut(&mut self) -> &mut usize {
        &mut self.help_scrolls[self.help_topic]
    }

    pub fn dict_scroll(&self) -> usize {
        self.dict_scrolls[self.dict_category]
    }

    pub fn dict_scroll_mut(&mut self) -> &mut usize {
        &mut self.dict_scrolls[self.dict_category]
    }

    pub fn flash(&mut self, msg: &str, duration_ms: u64, kind: FlashKind) {
        self.status_message = Some(msg.to_string());
        self.flash_until = Some(Instant::now() + Duration::from_millis(duration_ms));
        self.flash_kind = kind;
    }

    pub fn flash_kind(&self) -> Option<FlashKind> {
        if self.is_flashing() {
            Some(self.flash_kind)
        } else {
            None
        }
    }

    pub fn set_status(&mut self, msg: String) {
        self.status_message = Some(msg);
    }

    pub fn clear_status(&mut self) {
        self.status_message = None;
    }

    pub fn is_flashing(&self) -> bool {
        self.flash_until
            .map(|t| Instant::now() < t)
            .unwrap_or(false)
    }
}