use crossterm::event::{KeyCode, KeyEvent};
use ratatui::{
    layout::{Alignment, Constraint, Layout, Rect},
    style::{Color, Style},
    widgets::{Block, Borders, Paragraph},
    Frame,
};
use sqlx::sqlite::SqlitePool;
use tokio::sync::mpsc;

use crate::app::{AppMessage, NotifyLevel};
use crate::config::Settings;

#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum SyncState {
    Never,
    Syncing,
    Success,
    Error,
}

pub struct DashboardState {
    pub team_abbrev: String,
    pub season: i64,
    pub majors_count: usize,
    pub minors_count: usize,
    pub il_count: usize,
    pub swar_total: f64,
    pub sync_state: SyncState,
    pub sync_message: String,
}

impl DashboardState {
    pub fn new(team_abbrev: String, season: i64) -> Self {
        Self {
            team_abbrev,
            season,
            majors_count: 0,
            minors_count: 0,
            il_count: 0,
            swar_total: 0.0,
            sync_state: SyncState::Never,
            sync_message: String::new(),
        }
    }

    /// Fire async roster load on mount.
    pub fn mount(&mut self, pool: &SqlitePool, tx: &mpsc::UnboundedSender<AppMessage>) {
        let pool = pool.clone();
        let tx = tx.clone();
        let abbrev = self.team_abbrev.clone();
        let season = self.season;
        tokio::spawn(async move {
            match crate::db::queries::get_my_roster(&pool, &abbrev, season).await {
                Ok(roster) => {
                    let _ = tx.send(AppMessage::RosterLoaded(roster));
                }
                Err(e) => {
                    let _ = tx.send(AppMessage::Notify(
                        format!("Failed to load roster: {e}"),
                        NotifyLevel::Error,
                    ));
                }
            }
        });
    }

    pub fn handle_key(
        &mut self,
        key: KeyEvent,
        pool: &SqlitePool,
        settings: &Settings,
        tx: &mpsc::UnboundedSender<AppMessage>,
    ) {
        if let KeyCode::Char('s') = key.code {
            self.trigger_sync(pool, settings, tx);
        }
    }

    fn trigger_sync(
        &mut self,
        pool: &SqlitePool,
        settings: &Settings,
        tx: &mpsc::UnboundedSender<AppMessage>,
    ) {
        if self.sync_state == SyncState::Syncing {
            return;
        }
        self.sync_state = SyncState::Syncing;
        self.sync_message = "Syncing...".to_string();
        let pool = pool.clone();
        let settings = settings.clone();
        let tx = tx.clone();
        tokio::spawn(async move {
            let _ = tx.send(AppMessage::SyncStarted);
            let result = crate::api::sync::sync_all(&pool, &settings).await;
            let _ = tx.send(AppMessage::SyncComplete(result));
        });
    }

    pub fn handle_message(&mut self, msg: AppMessage) {
        match msg {
            AppMessage::RosterLoaded(roster) => {
                self.majors_count = roster.majors.len();
                self.minors_count = roster.minors.len();
                self.il_count = roster.il.len();
                self.swar_total = roster.majors.iter().filter_map(|p| p.swar).sum();
            }
            AppMessage::SyncStarted => {
                self.sync_state = SyncState::Syncing;
                self.sync_message = "Syncing...".to_string();
            }
            AppMessage::SyncComplete(result) => match result {
                Ok(r) => {
                    self.sync_state = SyncState::Success;
                    self.sync_message = format!(
                        "Synced {} teams, {} players, {} transactions",
                        r.teams, r.players, r.transactions
                    );
                }
                Err(e) => {
                    self.sync_state = SyncState::Error;
                    self.sync_message = format!("Sync failed: {e}");
                }
            },
            _ => {}
        }
    }

    pub fn render(&self, frame: &mut Frame, area: Rect, tick_count: u64) {
        let chunks = Layout::vertical([
            Constraint::Length(3), // title
            Constraint::Length(5), // summary cards
            Constraint::Length(3), // sync status
            Constraint::Min(0),   // key hints
        ])
        .split(area);

        // Title
        let title = Paragraph::new(format!(
            "SBA Scout  --  {}  --  Season {}",
            self.team_abbrev, self.season
        ))
        .block(Block::default().borders(Borders::ALL))
        .alignment(Alignment::Center);
        frame.render_widget(title, chunks[0]);

        // Summary cards
        let card_chunks = Layout::horizontal([
            Constraint::Ratio(1, 4),
            Constraint::Ratio(1, 4),
            Constraint::Ratio(1, 4),
            Constraint::Ratio(1, 4),
        ])
        .split(chunks[1]);

        let cards = [
            ("Majors", format!("{}/26", self.majors_count)),
            ("Minors", format!("{}/6", self.minors_count)),
            ("IL", self.il_count.to_string()),
            ("sWAR", format!("{:.1}", self.swar_total)),
        ];
        for (i, (label, value)) in cards.iter().enumerate() {
            let card = Paragraph::new(value.as_str())
                .block(Block::default().borders(Borders::ALL).title(*label))
                .alignment(Alignment::Center);
            frame.render_widget(card, card_chunks[i]);
        }

        // Sync status
        let spinner_chars = ['|', '/', '-', '\\'];
        let spinner = spinner_chars[(tick_count as usize / 2) % 4];
        let sync_text = match self.sync_state {
            SyncState::Never => "[s] Sync data from API".to_string(),
            SyncState::Syncing => format!("{spinner} {}", self.sync_message),
            SyncState::Success => format!("OK {}  [s] Sync again", self.sync_message),
            SyncState::Error => format!("ERR {}  [s] Retry", self.sync_message),
        };
        let sync_style = match self.sync_state {
            SyncState::Error => Style::default().fg(Color::Red),
            SyncState::Success => Style::default().fg(Color::Green),
            _ => Style::default(),
        };
        let sync_widget = Paragraph::new(sync_text)
            .style(sync_style)
            .block(Block::default().borders(Borders::ALL).title("Sync"));
        frame.render_widget(sync_widget, chunks[2]);

        // Key hints
        let hints = Paragraph::new(" [s] Sync  [g] Gameday  [q] Quit")
            .style(Style::default().fg(Color::DarkGray));
        frame.render_widget(hints, chunks[3]);
    }
}