#![allow(dead_code)]

use crossterm::event::{KeyCode, KeyEvent, KeyModifiers};
use ratatui::{
    layout::{Constraint, Layout, Rect},
    style::Style,
    widgets::{ListState, Paragraph},
    Frame,
};

use crate::data::{
    sample_artists, sample_calendar, sample_history, sample_queue, sample_wanted,
    Artist, CalendarEntry, HistoryEntry, QueueEntry, WantedEntry,
};
use crate::input::{
    build_leader_tree, LeaderAction, LeaderNode, LeaderResult, LeaderState, VimState,
};
use crate::theme;
use crate::ui::cmdline::{render_cmdline, CmdLineState};
use crate::ui::library::{render_library, LibraryFocus, LibraryState};
use crate::ui::modals::{render_help_modal, render_quit_modal, ModalKind};
use crate::ui::notifications::{NotifKind, NotificationManager};
use crate::ui::statusbar::{render_statusbar, StatusHint};
use crate::ui::topbar::render_topbar;
use crate::ui::views::{render_calendar, render_history, render_queue, render_settings, render_wanted};
use crate::ui::which_key::render_which_key;

const PAGE_SIZE: usize = 12;
const HALF_PAGE: usize = 6;

#[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
pub enum Tab {
    #[default]
    Library,
    Wanted,
    Queue,
    History,
    Calendar,
    Settings,
}

impl Tab {
    pub const ALL: [Tab; 6] = [
        Tab::Library,
        Tab::Wanted,
        Tab::Queue,
        Tab::History,
        Tab::Calendar,
        Tab::Settings,
    ];

    pub fn from_number(n: u8) -> Option<Tab> {
        match n {
            1 => Some(Tab::Library),
            2 => Some(Tab::Wanted),
            3 => Some(Tab::Queue),
            4 => Some(Tab::History),
            5 => Some(Tab::Calendar),
            6 => Some(Tab::Settings),
            _ => None,
        }
    }

    pub fn index(&self) -> usize {
        match self {
            Tab::Library => 0,
            Tab::Wanted => 1,
            Tab::Queue => 2,
            Tab::History => 3,
            Tab::Calendar => 4,
            Tab::Settings => 5,
        }
    }

    pub fn label(&self) -> &'static str {
        match self {
            Tab::Library => "Library",
            Tab::Wanted => "Wanted",
            Tab::Queue => "Queue",
            Tab::History => "History",
            Tab::Calendar => "Calendar",
            Tab::Settings => "Settings",
        }
    }
}

#[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
pub enum Mode {
    #[default]
    Normal,
    Command,
    Search,
}

pub struct App {
    pub running: bool,
    pub tab: Tab,
    pub mode: Mode,
    pub size: Rect,
    pub library: LibraryState,
    pub vim: VimState,
    pub leader: LeaderState,
    pub leader_tree: LeaderNode,
    pub cmd_line: CmdLineState,
    pub search_filter: String,
    pub status_message: Option<String>,
    pub marks: std::collections::HashMap<char, MarkPosition>,
    pub last_position: Option<MarkPosition>,
    filtered_artists: Vec<Artist>,
    pub modal: Option<ModalKind>,
    pub wanted: Vec<WantedEntry>,
    pub wanted_state: ListState,
    pub queue: Vec<QueueEntry>,
    pub queue_state: ListState,
    pub history: Vec<HistoryEntry>,
    pub history_state: ListState,
    pub calendar: Vec<CalendarEntry>,
    pub notifications: NotificationManager,
}

#[derive(Debug, Clone)]
pub struct MarkPosition {
    pub tab: Tab,
    pub focus: LibraryFocus,
    pub artist_idx: usize,
    pub album_idx: usize,
    pub track_idx: usize,
}

impl Default for App {
    fn default() -> Self {
        let artists = sample_artists();
        let wanted = sample_wanted();
        let queue = sample_queue();
        let history = sample_history();
        let calendar = sample_calendar();

        let mut wanted_state = ListState::default();
        if !wanted.is_empty() {
            wanted_state.select(Some(0));
        }

        let mut queue_state = ListState::default();
        if !queue.is_empty() {
            queue_state.select(Some(0));
        }

        let mut history_state = ListState::default();
        if !history.is_empty() {
            history_state.select(Some(0));
        }

        Self {
            running: true,
            tab: Tab::Library,
            mode: Mode::Normal,
            size: Rect::default(),
            library: LibraryState::new(artists.clone()),
            vim: VimState::new(),
            leader: LeaderState::new(),
            leader_tree: build_leader_tree(),
            cmd_line: CmdLineState::new(),
            search_filter: String::new(),
            status_message: None,
            marks: std::collections::HashMap::new(),
            last_position: None,
            filtered_artists: artists,
            modal: None,
            wanted,
            wanted_state,
            queue,
            queue_state,
            history,
            history_state,
            calendar,
            notifications: NotificationManager::new(),
        }
    }
}

impl App {
    pub fn new() -> Self {
        Self::default()
    }

    fn capture_position(&self) -> MarkPosition {
        MarkPosition {
            tab: self.tab,
            focus: self.library.focus,
            artist_idx: self.library.artist_state.selected().unwrap_or(0),
            album_idx: self.library.album_state.selected().unwrap_or(0),
            track_idx: self.library.track_state.selected().unwrap_or(0),
        }
    }

    fn restore_position(&mut self, pos: &MarkPosition) {
        self.tab = pos.tab;
        self.library.focus = pos.focus;
        self.library.artist_state.select(Some(pos.artist_idx));
        self.library.album_state.select(Some(pos.album_idx));
        self.library.track_state.select(Some(pos.track_idx));
    }

    fn set_status(&mut self, msg: impl Into<String>) {
        self.status_message = Some(msg.into());
    }

    pub fn draw(&mut self, frame: &mut Frame) {
        self.size = frame.area();
        let area = frame.area();

        frame.render_widget(
            Paragraph::new("").style(Style::default().bg(theme::BG0)),
            area,
        );

        let show_cmdline = self.mode != Mode::Normal;
        let cmdline_height = if show_cmdline { 1 } else { 0 };

        let chunks = Layout::vertical([
            Constraint::Length(1),
            Constraint::Min(1),
            Constraint::Length(cmdline_height),
            Constraint::Length(1),
        ])
        .split(area);

        let queue_count = sample_queue().len();
        let wanted_count = sample_wanted().len();

        render_topbar(
            frame,
            chunks[0],
            self.tab,
            self.mode,
            queue_count,
            wanted_count,
        );

        self.render_main_content(frame, chunks[1]);

        if show_cmdline {
            let hint = match self.mode {
                Mode::Command => "try :help · :theme light · :wanted · :q",
                Mode::Search => "filter artists by name",
                Mode::Normal => "",
            };
            render_cmdline(frame, chunks[2], self.mode, &self.cmd_line.text, hint);
        }

        let hints = self.get_hints();
        let position = self.get_position();
        render_statusbar(
            frame,
            chunks[3],
            self.mode,
            &hints,
            position,
            queue_count,
            wanted_count,
            self.status_message.as_deref(),
        );

        if self.leader.active {
            render_which_key(frame, area, &self.leader, &self.leader_tree);
        }

        if let Some(modal) = &self.modal {
            match modal {
                ModalKind::Help => render_help_modal(frame, area),
                ModalKind::Quit => render_quit_modal(frame, area, self.queue.len()),
            }
        }

        self.notifications.render(frame, area);
    }

    fn render_main_content(&mut self, frame: &mut Frame, area: Rect) {
        match self.tab {
            Tab::Library => {
                render_library(frame, area, &mut self.library);
            }
            Tab::Wanted => {
                render_wanted(frame, area, &self.wanted, &mut self.wanted_state);
            }
            Tab::Queue => {
                render_queue(frame, area, &self.queue, &mut self.queue_state);
            }
            Tab::History => {
                render_history(frame, area, &self.history, &mut self.history_state);
            }
            Tab::Calendar => {
                render_calendar(frame, area, &self.calendar);
            }
            Tab::Settings => {
                render_settings(frame, area);
            }
        }
    }

    fn get_hints(&self) -> Vec<StatusHint> {
        match self.tab {
            Tab::Library => vec![
                StatusHint { key: "j/k", action: "move" },
                StatusHint { key: "h/l", action: "pane" },
                StatusHint { key: "SPC", action: "leader" },
                StatusHint { key: "a", action: "add" },
                StatusHint { key: "/", action: "filter" },
                StatusHint { key: "?", action: "help" },
            ],
            Tab::Wanted => vec![
                StatusHint { key: "j/k", action: "move" },
                StatusHint { key: "s", action: "search" },
                StatusHint { key: "m", action: "unmonitor" },
                StatusHint { key: "SPC", action: "leader" },
            ],
            Tab::Queue => vec![
                StatusHint { key: "j/k", action: "move" },
                StatusHint { key: "x", action: "remove" },
                StatusHint { key: "p", action: "pause" },
                StatusHint { key: "SPC", action: "leader" },
            ],
            Tab::History => vec![
                StatusHint { key: "j/k", action: "move" },
                StatusHint { key: "d", action: "clear" },
                StatusHint { key: "r", action: "retry" },
                StatusHint { key: "SPC", action: "leader" },
            ],
            Tab::Calendar => vec![
                StatusHint { key: "h/l", action: "month" },
                StatusHint { key: "Enter", action: "details" },
                StatusHint { key: "SPC", action: "leader" },
            ],
            Tab::Settings => vec![
                StatusHint { key: "Tab", action: "next" },
                StatusHint { key: "Enter", action: "edit" },
                StatusHint { key: ":w", action: "save" },
                StatusHint { key: "SPC", action: "leader" },
            ],
        }
    }

    fn get_position(&self) -> Option<(usize, usize)> {
        match self.tab {
            Tab::Library => {
                let idx = self.library.selected_artist_index().unwrap_or(0) + 1;
                let total = self.library.artist_count();
                Some((idx, total))
            }
            Tab::Wanted => {
                let idx = self.wanted_state.selected().unwrap_or(0) + 1;
                Some((idx, self.wanted.len()))
            }
            Tab::Queue => {
                let idx = self.queue_state.selected().unwrap_or(0) + 1;
                Some((idx, self.queue.len()))
            }
            Tab::History => {
                let idx = self.history_state.selected().unwrap_or(0) + 1;
                Some((idx, self.history.len()))
            }
            Tab::Calendar | Tab::Settings => None,
        }
    }

    pub fn handle_key(&mut self, key: KeyEvent) {
        self.status_message = None;

        if key.modifiers.contains(KeyModifiers::CONTROL) && key.code == KeyCode::Char('c') {
            self.running = false;
            return;
        }

        if self.modal.is_some() {
            self.handle_modal_key(key);
            return;
        }

        match self.mode {
            Mode::Command | Mode::Search => {
                self.handle_cmdline_key(key);
                return;
            }
            Mode::Normal => {}
        }

        if self.leader.active {
            self.handle_leader_key(key);
            return;
        }

        self.handle_normal_key(key);
    }

    fn handle_modal_key(&mut self, key: KeyEvent) {
        match key.code {
            KeyCode::Esc | KeyCode::Char('n') => {
                self.modal = None;
            }
            KeyCode::Char('y') => {
                if self.modal == Some(ModalKind::Quit) {
                    self.running = false;
                }
            }
            KeyCode::Char('q') => {
                self.modal = None;
            }
            _ => {}
        }
    }

    fn handle_cmdline_key(&mut self, key: KeyEvent) {
        match key.code {
            KeyCode::Esc => {
                self.mode = Mode::Normal;
                self.cmd_line.clear();
            }
            KeyCode::Enter => {
                let text = self.cmd_line.take();
                if self.mode == Mode::Command {
                    self.execute_command(&text);
                } else {
                    self.execute_search(&text);
                }
                self.mode = Mode::Normal;
            }
            KeyCode::Char(c) => {
                self.cmd_line.push(c);
            }
            KeyCode::Backspace => {
                if self.cmd_line.pop().is_none() || self.cmd_line.is_empty() {
                    self.mode = Mode::Normal;
                    self.cmd_line.clear();
                }
            }
            _ => {}
        }
    }

    fn handle_leader_key(&mut self, key: KeyEvent) {
        match key.code {
            KeyCode::Esc => {
                self.leader.deactivate();
            }
            KeyCode::Backspace => {
                self.leader.go_back();
            }
            KeyCode::Char(c) => {
                let result = self.leader.navigate(c, &self.leader_tree);
                match result {
                    LeaderResult::Pending => {}
                    LeaderResult::Executed(action) => {
                        self.execute_leader_action(action);
                    }
                    LeaderResult::NotBound => {
                        let path: String = self.leader.path.iter().collect();
                        self.set_status(format!("SPC {} {} not bound", path, c));
                    }
                }
            }
            _ => {}
        }
    }

    fn execute_leader_action(&mut self, action: LeaderAction) {
        match action {
            LeaderAction::SetTab(tab) => self.tab = tab,
            LeaderAction::SetMode(mode) => {
                self.mode = mode;
                self.cmd_line.clear();
            }
            LeaderAction::NextTab => {
                let idx = (self.tab.index() + 1) % Tab::ALL.len();
                self.tab = Tab::ALL[idx];
            }
            LeaderAction::PrevTab => {
                let idx = (self.tab.index() + Tab::ALL.len() - 1) % Tab::ALL.len();
                self.tab = Tab::ALL[idx];
            }
            LeaderAction::ToggleMonitor => {
                self.set_status("monitor toggled");
                self.notify("monitor toggled", None, NotifKind::Info, "◉");
            }
            LeaderAction::Refresh => {
                self.set_status("scanning library...");
                self.notify("scanning library", Some("18 artists".into()), NotifKind::Info, "↻");
            }
            LeaderAction::SearchRelease => {
                self.set_status("search release");
            }
            LeaderAction::CycleTheme => {
                self.set_status("theme cycled");
                self.notify("theme", Some("dark".into()), NotifKind::Success, "◐");
            }
            LeaderAction::SetThemeDark => {
                self.set_status("theme: dark");
                self.notify("theme", Some("dark".into()), NotifKind::Success, "●");
            }
            LeaderAction::SetThemeLight => {
                self.set_status("theme: light");
                self.notify("theme", Some("light".into()), NotifKind::Success, "○");
            }
            LeaderAction::ShowNotifications => {
                self.set_status("notifications");
            }
            LeaderAction::DismissNotifications => {
                self.set_status("notifications dismissed");
            }
            LeaderAction::ShowHelp => {
                self.modal = Some(ModalKind::Help);
            }
            LeaderAction::ShowAdd => {
                self.set_status("add artist");
            }
            LeaderAction::ShowQuit => {
                self.modal = Some(ModalKind::Quit);
            }
            LeaderAction::SyncLibrary => {
                self.set_status("library synced · 0 changes");
                self.notify("library synced", Some("0 changes".into()), NotifKind::Success, "✓");
            }
        }
    }

    fn handle_normal_key(&mut self, key: KeyEvent) {
        let ctrl = key.modifiers.contains(KeyModifiers::CONTROL);

        if self.vim.has_pending() {
            self.handle_pending_key(key);
            return;
        }

        if let KeyCode::Char(c) = key.code {
            if self.vim.accumulate_count(c) {
                return;
            }
        }

        let count = self.vim.take_count();

        if ctrl {
            self.handle_ctrl_key(key, count);
            return;
        }

        match key.code {
            KeyCode::Char(' ') => {
                self.leader.activate();
            }
            KeyCode::Char(':') => {
                self.mode = Mode::Command;
                self.cmd_line.clear();
            }
            KeyCode::Char('/') => {
                self.last_position = Some(self.capture_position());
                self.mode = Mode::Search;
                self.cmd_line.clear();
            }
            KeyCode::Char('?') => {
                self.modal = Some(ModalKind::Help);
            }

            KeyCode::Char('g') | KeyCode::Char('z') | KeyCode::Char('m') | KeyCode::Char('\'')
            | KeyCode::Char('`') | KeyCode::Char('[') | KeyCode::Char(']') => {
                if let KeyCode::Char(c) = key.code {
                    self.vim.set_pending(c);
                }
            }

            KeyCode::Char('j') | KeyCode::Down => self.move_cursor(count as isize),
            KeyCode::Char('k') | KeyCode::Up => self.move_cursor(-(count as isize)),

            KeyCode::Char('h') | KeyCode::Left => {
                if self.tab == Tab::Library {
                    self.library.focus_left();
                }
            }
            KeyCode::Char('l') | KeyCode::Right => {
                if self.tab == Tab::Library {
                    self.library.focus_right();
                }
            }

            KeyCode::Char('w') => self.move_cursor(3 * count as isize),
            KeyCode::Char('W') => self.move_cursor(5 * count as isize),
            KeyCode::Char('b') => self.move_cursor(-3 * (count as isize)),
            KeyCode::Char('B') => self.move_cursor(-5 * (count as isize)),
            KeyCode::Char('e') => self.move_cursor(3 * count as isize),
            KeyCode::Char('E') => self.move_cursor(5 * count as isize),

            KeyCode::Char('{') => self.move_cursor(-5 * (count as isize)),
            KeyCode::Char('}') => self.move_cursor(5 * count as isize),
            KeyCode::Char('(') => self.move_cursor(-3 * (count as isize)),
            KeyCode::Char(')') => self.move_cursor(3 * count as isize),

            KeyCode::Char('0') | KeyCode::Char('^') => {
                if self.tab == Tab::Library {
                    self.library.focus = LibraryFocus::Artists;
                }
            }
            KeyCode::Char('$') => {
                if self.tab == Tab::Library {
                    self.library.focus = LibraryFocus::Tracks;
                }
            }

            KeyCode::Char('G') => {
                self.last_position = Some(self.capture_position());
                if self.vim.has_count() {
                    let line = self.vim.take_count();
                    self.move_to(line.saturating_sub(1));
                } else {
                    self.move_to_end();
                }
            }

            KeyCode::Char('H') => {
                self.last_position = Some(self.capture_position());
                self.move_to(0);
            }
            KeyCode::Char('M') => {
                self.last_position = Some(self.capture_position());
                let len = self.current_list_len();
                self.move_to(len / 2);
            }
            KeyCode::Char('L') => {
                self.last_position = Some(self.capture_position());
                self.move_to_end();
            }

            KeyCode::Char('n') => {
                self.set_status("n: repeat search forward");
            }
            KeyCode::Char('N') => {
                self.set_status("N: repeat search backward");
            }
            KeyCode::Char('*') => {
                self.set_status("*: search word under cursor forward");
            }
            KeyCode::Char('#') => {
                self.set_status("#: search word under cursor backward");
            }

            KeyCode::Char('a') => {
                self.set_status("add artist");
            }
            KeyCode::Char('s') => {
                self.set_status("search release");
            }
            KeyCode::Char('r') => {
                self.set_status("refresh");
            }
            KeyCode::Char('t') => {
                self.set_status("monitor toggled");
            }

            KeyCode::Char('q') => {
                self.modal = Some(ModalKind::Quit);
            }

            KeyCode::Char('1') => self.tab = Tab::Library,
            KeyCode::Char('2') => self.tab = Tab::Wanted,
            KeyCode::Char('3') => self.tab = Tab::Queue,
            KeyCode::Char('4') => self.tab = Tab::History,
            KeyCode::Char('5') => self.tab = Tab::Calendar,
            KeyCode::Char('6') => self.tab = Tab::Settings,

            KeyCode::Tab => {
                if self.tab == Tab::Library {
                    self.library.cycle_focus();
                }
            }
            KeyCode::Enter => {
                if self.tab == Tab::Library {
                    self.library.focus_right();
                }
            }
            KeyCode::Esc => {
                self.vim.clear();
                if !self.search_filter.is_empty() {
                    self.search_filter.clear();
                    self.update_filtered_artists();
                    self.set_status("filter cleared");
                } else if self.library.focus != LibraryFocus::Artists {
                    self.library.focus_left();
                }
            }

            _ => {}
        }
    }

    fn handle_ctrl_key(&mut self, key: KeyEvent, count: usize) {
        match key.code {
            KeyCode::Char('d') => {
                self.last_position = Some(self.capture_position());
                self.move_cursor((HALF_PAGE * count) as isize);
            }
            KeyCode::Char('u') => {
                self.last_position = Some(self.capture_position());
                self.move_cursor(-((HALF_PAGE * count) as isize));
            }
            KeyCode::Char('f') => {
                self.last_position = Some(self.capture_position());
                self.move_cursor((PAGE_SIZE * count) as isize);
            }
            KeyCode::Char('b') => {
                self.last_position = Some(self.capture_position());
                self.move_cursor(-((PAGE_SIZE * count) as isize));
            }
            KeyCode::Char('e') => {
                self.move_cursor(count as isize);
            }
            KeyCode::Char('y') => {
                self.move_cursor(-(count as isize));
            }
            KeyCode::Char('o') => {
                if let Some(pos) = self.last_position.take() {
                    let current = self.capture_position();
                    self.restore_position(&pos);
                    self.last_position = Some(current);
                } else {
                    self.set_status("at start of jumplist");
                }
            }
            KeyCode::Char('i') => {
                self.set_status("Ctrl-i: forward in jumplist");
            }
            _ => {}
        }
    }

    fn handle_pending_key(&mut self, key: KeyEvent) {
        let pending = match self.vim.take_pending() {
            Some(p) => p,
            None => return,
        };
        let count = self.vim.take_count();

        let KeyCode::Char(k) = key.code else {
            return;
        };

        match pending {
            'g' => match k {
                'g' => {
                    self.last_position = Some(self.capture_position());
                    self.move_to(0);
                }
                'e' => self.move_cursor(-3 * (count as isize)),
                'E' => self.move_cursor(-5 * (count as isize)),
                'j' => self.move_cursor(count as isize),
                'k' => self.move_cursor(-(count as isize)),
                '_' => self.move_to_end(),
                '0' => {
                    if self.tab == Tab::Library {
                        self.library.focus = LibraryFocus::Artists;
                    }
                }
                '$' => {
                    if self.tab == Tab::Library {
                        self.library.focus = LibraryFocus::Tracks;
                    }
                }
                't' => {
                    let idx = (self.tab.index() + 1) % Tab::ALL.len();
                    self.tab = Tab::ALL[idx];
                }
                'T' => {
                    let idx = (self.tab.index() + Tab::ALL.len() - 1) % Tab::ALL.len();
                    self.tab = Tab::ALL[idx];
                }
                _ => {}
            },
            'z' => match k {
                'z' | '.' => self.set_status("zz: cursor centered"),
                't' => self.set_status("zt: cursor → viewport top"),
                'b' | '-' => self.set_status("zb: cursor → viewport bottom"),
                _ => {}
            },
            'm' => {
                if k.is_ascii_alphabetic() {
                    let pos = self.capture_position();
                    self.marks.insert(k, pos);
                    self.set_status(format!("mark '{}' set", k));
                    self.notify("mark set", Some(format!("'{}", k)), NotifKind::Info, "⚑");
                }
            }
            '\'' | '`' => {
                if k == '\'' || k == '`' {
                    if let Some(pos) = self.last_position.take() {
                        let current = self.capture_position();
                        self.restore_position(&pos);
                        self.last_position = Some(current);
                    } else {
                        self.set_status("no previous position");
                    }
                } else if k.is_ascii_alphabetic() {
                    if let Some(pos) = self.marks.get(&k).cloned() {
                        self.last_position = Some(self.capture_position());
                        self.restore_position(&pos);
                    } else {
                        self.set_status(format!("E20: mark not set: '{}'", k));
                    }
                }
            }
            '[' => match k {
                '[' => {
                    self.last_position = Some(self.capture_position());
                    self.move_to(0);
                }
                'c' => self.move_cursor(-(count as isize)),
                _ => {}
            },
            ']' => match k {
                ']' => {
                    self.last_position = Some(self.capture_position());
                    self.move_to_end();
                }
                'c' => self.move_cursor(count as isize),
                _ => {}
            },
            _ => {}
        }
    }

    fn current_list_len(&self) -> usize {
        match self.tab {
            Tab::Library => match self.library.focus {
                LibraryFocus::Artists => self.library.artist_count(),
                LibraryFocus::Albums => self
                    .library
                    .selected_artist()
                    .map(|a| a.albums.len())
                    .unwrap_or(0),
                LibraryFocus::Tracks => self.library.selected_album().map(|a| a.total as usize).unwrap_or(0),
            },
            Tab::Wanted => self.wanted.len(),
            Tab::Queue => self.queue.len(),
            Tab::History => self.history.len(),
            Tab::Calendar | Tab::Settings => 0,
        }
    }

    fn move_cursor(&mut self, delta: isize) {
        let len = self.current_list_len();
        if len == 0 {
            return;
        }

        match self.tab {
            Tab::Library => match self.library.focus {
                LibraryFocus::Artists => {
                    let current = self.library.artist_state.selected().unwrap_or(0);
                    let new_idx = (current as isize + delta).clamp(0, (len - 1) as isize) as usize;
                    if new_idx != current {
                        self.library.artist_state.select(Some(new_idx));
                        self.library.album_state.select(Some(0));
                        self.library.track_state.select(Some(0));
                    }
                }
                LibraryFocus::Albums => {
                    let current = self.library.album_state.selected().unwrap_or(0);
                    let new_idx = (current as isize + delta).clamp(0, (len - 1) as isize) as usize;
                    if new_idx != current {
                        self.library.album_state.select(Some(new_idx));
                        self.library.track_state.select(Some(0));
                    }
                }
                LibraryFocus::Tracks => {
                    let current = self.library.track_state.selected().unwrap_or(0);
                    let new_idx = (current as isize + delta).clamp(0, (len - 1) as isize) as usize;
                    self.library.track_state.select(Some(new_idx));
                }
            },
            Tab::Wanted => {
                let current = self.wanted_state.selected().unwrap_or(0);
                let new_idx = (current as isize + delta).clamp(0, (len - 1) as isize) as usize;
                self.wanted_state.select(Some(new_idx));
            }
            Tab::Queue => {
                let current = self.queue_state.selected().unwrap_or(0);
                let new_idx = (current as isize + delta).clamp(0, (len - 1) as isize) as usize;
                self.queue_state.select(Some(new_idx));
            }
            Tab::History => {
                let current = self.history_state.selected().unwrap_or(0);
                let new_idx = (current as isize + delta).clamp(0, (len - 1) as isize) as usize;
                self.history_state.select(Some(new_idx));
            }
            Tab::Calendar | Tab::Settings => {}
        }
    }

    fn move_to(&mut self, idx: usize) {
        let len = self.current_list_len();
        if len == 0 {
            return;
        }

        let new_idx = idx.min(len - 1);

        match self.tab {
            Tab::Library => match self.library.focus {
                LibraryFocus::Artists => {
                    self.library.artist_state.select(Some(new_idx));
                    self.library.album_state.select(Some(0));
                    self.library.track_state.select(Some(0));
                }
                LibraryFocus::Albums => {
                    self.library.album_state.select(Some(new_idx));
                    self.library.track_state.select(Some(0));
                }
                LibraryFocus::Tracks => {
                    self.library.track_state.select(Some(new_idx));
                }
            },
            Tab::Wanted => {
                self.wanted_state.select(Some(new_idx));
            }
            Tab::Queue => {
                self.queue_state.select(Some(new_idx));
            }
            Tab::History => {
                self.history_state.select(Some(new_idx));
            }
            Tab::Calendar | Tab::Settings => {}
        }
    }

    fn move_to_end(&mut self) {
        let len = self.current_list_len();
        if len > 0 {
            self.move_to(len - 1);
        }
    }

    fn execute_command(&mut self, text: &str) {
        let text = text.trim();
        if text.is_empty() {
            return;
        }

        let parts: Vec<&str> = text.split_whitespace().collect();
        let cmd = parts.first().map(|s| s.to_lowercase()).unwrap_or_default();

        match cmd.as_str() {
            "q" | "quit" => self.running = false,
            "w" | "write" | "sync" => {
                self.set_status("library synced · 0 changes");
            }
            "wq" => {
                self.set_status("synced · bye");
                self.running = false;
            }
            "help" | "h" => {
                self.set_status("help");
            }
            "theme" => {
                if let Some(theme) = parts.get(1) {
                    match *theme {
                        "dark" => self.set_status("theme: dark"),
                        "light" => self.set_status("theme: light"),
                        _ => self.set_status("usage: :theme dark | light"),
                    }
                } else {
                    self.set_status("usage: :theme dark | light");
                }
            }
            "lib" | "library" => self.tab = Tab::Library,
            "wanted" => self.tab = Tab::Wanted,
            "queue" => self.tab = Tab::Queue,
            "history" => self.tab = Tab::History,
            "cal" | "calendar" => self.tab = Tab::Calendar,
            "settings" | "set" => self.tab = Tab::Settings,
            "refresh" | "rescan" | "r" => {
                self.set_status("library refreshed");
            }
            _ => {
                self.set_status(format!("E492: not an editor command: {}", text));
            }
        }
    }

    fn execute_search(&mut self, text: &str) {
        let filter = text.trim().to_string();
        self.search_filter = filter.clone();
        self.update_filtered_artists();

        if filter.is_empty() {
            self.set_status("filter cleared");
        } else {
            let count = self.filtered_artists.len();
            self.set_status(format!("filter: /{} · {} matches", filter, count));
            self.notify("filter", Some(format!("/{}", filter)), NotifKind::Info, "⌕");
        }
    }

    fn update_filtered_artists(&mut self) {
        if self.search_filter.is_empty() {
            self.filtered_artists = self.library.artists.clone();
        } else {
            let query = self.search_filter.to_lowercase();
            self.filtered_artists = self
                .library
                .artists
                .iter()
                .filter(|a| a.name.to_lowercase().contains(&query))
                .cloned()
                .collect();
        }
        self.library.artist_state.select(Some(0));
    }

    pub fn handle_tick(&mut self) {
        if self.status_message.is_some() {
            self.status_message = None;
        }
        self.notifications.tick();
    }

    fn notify(&mut self, title: impl Into<String>, detail: Option<String>, kind: NotifKind, icon: impl Into<String>) {
        self.notifications.push(title, detail, kind, icon);
    }
}