//! Briscola table view: classic two-player and four-player partnership.
//!
//! The two variants share this view: four seats render in the usual cross
//! (partners opposite), two seats stack opponent over player. The center
//! holds the trick in progress, the stock pile and the face-up briscola.
use sycamore::prelude::*;

use crate::components::card::{card_back, card_img};
use crate::components::copy::CopyButton;
use crate::model::{
    hand_sort_key, is_individual_game, suit_name, GameView, PlayerView, Scores,
};
use crate::pages::game::watch_link;

fn player_for_seat(game: &GameView, seat: usize) -> Option<PlayerView> {
    game.players.iter().find(|p| p.seat == seat).cloned()
}

/// Panel for one player seat (name, team, hidden card count, points).
fn seat_panel(game: GameView, seat: usize, position: &'static str) -> View {
    let Some(player) = player_for_seat(&game, seat) else {
        return view! {};
    };
    let active = game.phase == "playing" && game.turn == seat;
    let cls = format!(
        "seat seat-{position}{}",
        if active { " active" } else { "" }
    );
    let name = player.name.clone();
    let team_badge = (!is_individual_game(&game.game_type))
        .then(|| player.team.clone())
        .flatten()
        .filter(|team| !team.is_empty())
        .map(|team| view! { span(class="team-badge") { "Team " (team) } });
    let points = player.points;
    let captured = player.captured_count;
    let backs = (0..player.cards_left)
        .map(|_| card_back("mini"))
        .collect::<Vec<_>>();
    view! {
        div(class=cls) {
            div(class="seat-name") {
                (name)
                (team_badge)
            }
            div(class="seat-cards") { (backs) }
            div(class="seat-stats") {
                (points) " points · " (captured) " cards"
            }
        }
    }
}

/// The stock pile with the face-up briscola card beside it.
fn stock_view(game: &GameView) -> View {
    let backs = (0..game.stock_count.min(3))
        .map(|_| card_back("stock-card"))
        .collect::<Vec<_>>();
    let trump = game
        .briscola_card
        .clone()
        .map(|code| card_img(code, "briscola-card"));
    let label = format!("{} in stock", game.stock_count);
    view! {
        div(class="stock") {
            div(class="stock-pile") { (backs) }
            (trump)
            span(class="stock-count") { (label) }
        }
    }
}

/// The cards of the trick in progress, in play order, with player names.
fn trick_view(game: &GameView) -> View {
    if game.trick.is_empty() {
        return view! { p(class="table-empty") { "Empty table" } };
    }
    let cards = game
        .trick
        .iter()
        .map(|tc| {
            let name = player_for_seat(game, tc.seat)
                .map(|p| p.name)
                .unwrap_or_default();
            let card = card_img(tc.card.clone(), "table-card");
            view! {
                div(class="trick-slot") {
                    span(class="trick-name") { (name) }
                    (card)
                }
            }
        })
        .collect::<Vec<_>>();
    view! { (cards) }
}

/// Announcement strip for the most recently completed trick.
fn last_trick_banner(game: &GameView) -> View {
    let Some(trick) = game.last_trick.clone() else {
        return view! {};
    };
    let name = player_for_seat(game, trick.winner)
        .map(|p| p.name)
        .unwrap_or_default();
    let cards = trick
        .cards
        .iter()
        .map(|tc| card_img(tc.card.clone(), "move-card"))
        .collect::<Vec<_>>();
    view! {
        div(class="move-banner") {
            strong { (name) }
            span { " takes the trick " }
            (cards)
        }
    }
}

/// The main briscola table.
pub fn briscola_table(
    game: GameView,
    on_hand_card: impl Fn(String) + Copy + 'static,
    now: Signal<f64>,
) -> View {
    // Own seat: the only player entry carrying a hand. Spectators have no
    // hand, so they watch from seat 0's perspective.
    let viewer_seat = game
        .players
        .iter()
        .find(|p| p.hand.is_some())
        .map(|p| p.seat)
        .unwrap_or(0);
    let player_count = if game.player_count > 0 {
        game.player_count
    } else {
        game.players.len().max(1)
    };
    let my_turn = game.your_turn == Some(true);
    let turn_note = if game.phase == "finished" {
        "Match finished".to_string()
    } else if game.phase == "hand_end" {
        "Deal finished".to_string()
    } else if my_turn {
        "Your turn".to_string()
    } else {
        let name = player_for_seat(&game, game.turn)
            .map(|p| p.name)
            .unwrap_or_default();
        format!("{name}'s turn")
    };
    let turn_cls = if my_turn { "turn-note you" } else { "turn-note" };
    let countdown = game.turn_deadline.as_ref().map(|deadline| {
        // A dynamic closure so only the ticking number re-renders.
        let deadline_ms = js_sys::Date::parse(deadline);
        view! {
            span(class="turn-timer") {
                "Auto-play in "
                (move || {
                    ((deadline_ms - now.get_clone()) / 1000.0).ceil().max(0.0) as i32
                })
                "s"
            }
        }
    });

    let scores = game.scores.unwrap_or(Scores { a: 0, b: 0 });
    let target = game.target_score;
    let deal = game.hand_number;
    // Two-player briscola has no partnerships: show the players' names.
    let score_line = if is_individual_game(&game.game_type) {
        format!(
            "{} {} — {} {} (target {})",
            game.player_name_for_team("A"),
            scores.a,
            scores.b,
            game.player_name_for_team("B"),
            target
        )
    } else {
        format!("Team A {} — {} Team B (target {})", scores.a, scores.b, target)
    };

    let (grid_cls, top, left, right) = if player_count == 2 {
        (
            "table-grid duo",
            seat_panel(game.clone(), (viewer_seat + 1) % 2, "top"),
            view! {},
            view! {},
        )
    } else {
        (
            "table-grid",
            seat_panel(game.clone(), (viewer_seat + 2) % 4, "top"),
            seat_panel(game.clone(), (viewer_seat + 1) % 4, "left"),
            seat_panel(game.clone(), (viewer_seat + 3) % 4, "right"),
        )
    };

    let viewer = player_for_seat(&game, viewer_seat);
    let my_points = viewer.as_ref().map(|p| p.points).unwrap_or(0);
    let mut hand = viewer.and_then(|p| p.hand).unwrap_or_default();
    hand.sort_by_key(|c| hand_sort_key(c));
    let hand_cards = hand
        .into_iter()
        .map(|code| {
            let card_view = card_img(code.clone(), "hand-card");
            view! {
                button(class="hand-slot", on:click=move |_| {
                    if my_turn {
                        on_hand_card(code.clone());
                    }
                }) { (card_view) }
            }
        })
        .collect::<Vec<_>>();
    let hint = my_turn.then(|| view! {
        p(class="text-secondary small text-center") {
            "Click a card to play it."
        }
    });

    // Spectators have no hand: render the pivot seat as a regular panel so
    // its points stay visible where the hand would be.
    let bottom = if game.spectator {
        seat_panel(game.clone(), viewer_seat, "bottom")
    } else {
        view! {
            div(class="seat-bottom") {
                div(class="seat-stats own-stats") { (my_points) " points" }
                div(class="hand") { (hand_cards) }
                (hint)
            }
        }
    };

    let spectator_badge = game.spectator.then(|| view! {
        span(class="spectator-badge") { "Spectating" }
    });
    let watch_link = watch_link(&game.id);
    let trump_badge = (!game.briscola_suit.is_empty()).then(|| {
        let suit = suit_name(&game.briscola_suit);
        view! { span(class="briscola-badge") { "Briscola: " (suit) } }
    });
    // Precomputed so the final view's closures only capture owned views.
    let banner = last_trick_banner(&game);
    let trick = trick_view(&game);
    let stock = stock_view(&game);

    view! {
        div(class="table-wrap") {
            div(class="hud") {
                a(href="/") { "← Lobby" }
                span { "Deal " (deal) }
                (trump_badge)
                (spectator_badge)
                span(class="hud-scores") { (score_line) }
                span(class=turn_cls) { (turn_note) }
                (countdown)
                CopyButton(text=watch_link, label="Copy watch link".to_string())
            }
            div(class=grid_cls) {
                (top)
                (left)
                div(class="center") {
                    (banner)
                    div(class="table-cards") { (trick) }
                    (stock)
                }
                (right)
                (bottom)
            }
        }
    }
}