"""HTML rendering of the boards (pure strings, no JS)."""
from __future__ import annotations

import html

from tetris import COLOR_ID, HEIGHT, ROTATIONS, WIDTH

MEDALS = {1: "🥇", 2: "🥈", 3: "🥉"}

CSS = """
.arena {display:grid; grid-template-columns:repeat(auto-fit, minmax(min(128px, 100%), 1fr)); gap:12px 10px; padding:4px 0; max-width:960px; margin:0 auto;}
.pcard {width:100%; max-width:214px; min-width:0; justify-self:center; display:flex; flex-direction:column; gap:6px;}
.pname {font-weight:700; font-size:13px; line-height:1.25; overflow:hidden; text-overflow:ellipsis;
        white-space:nowrap; color:var(--body-text-color);}
.pmeta {font-size:11px; color:var(--body-text-color-subdued); display:flex; justify-content:space-between; align-items:center; gap:6px; min-height:18px;}
/* ---- 8-bit game look: square bevelled blocks, black well, grey frame, pixel font (like the original) ---- */
.pstats {display:grid; grid-template-columns:repeat(3,1fr); gap:4px;}
.pstats div {background:#000; border:2px solid #6b6b6b; box-shadow:inset 0 0 0 1px #000, 0 0 0 1px #000;
             padding:5px 2px 4px; text-align:center; min-width:0;}
.pstats b {display:block; font:400 10px/1.25 'Press Start 2P',ui-monospace,monospace; color:#fff; letter-spacing:-.02em;
           overflow:hidden; text-overflow:clip; white-space:nowrap;}
.pstats span {display:block; margin-top:3px; font:400 6px/1 'Press Start 2P',ui-monospace,monospace; text-transform:uppercase;
              color:#9a9a9a;}
.board {position:relative; display:grid; grid-template-columns:repeat(10,1fr); grid-template-rows:repeat(20,1fr); gap:0;
        padding:0; background:#000; border:3px solid #a8a8a8; border-radius:0; aspect-ratio:1/2;
        box-shadow:0 0 0 2px #000, 0 0 0 4px #5a5a5a; margin:4px; image-rendering:pixelated;}
.board i {display:block; background:#000; box-shadow:inset 0 0 0 1px #0c0c0c;}
.board i[class^="c"] {box-shadow:inset 2px 2px 0 rgba(255,255,255,.55), inset -2px -2px 0 rgba(0,0,0,.5), inset 0 0 0 1px rgba(0,0,0,.65);}
.board i.c1, .pnext i.c1 {background:#00d8f0;} .board i.c2, .pnext i.c2 {background:#f0d800;} .board i.c3, .pnext i.c3 {background:#a000f0;}
.board i.c4, .pnext i.c4 {background:#00c800;} .board i.c5, .pnext i.c5 {background:#e80000;} .board i.c6, .pnext i.c6 {background:#1840ff;}
.board i.c7, .pnext i.c7 {background:#f08c00;}
.board i.n {filter:brightness(1.35); animation:px-flash .4s steps(2) 1;}
@keyframes px-flash {0% {filter:brightness(2.2);} 100% {filter:brightness(1.35);}}
.board .over {position:absolute; inset:0; display:flex; flex-direction:column; align-items:center; justify-content:center;
        background:rgba(0,0,0,.74); gap:8px; text-align:center; padding:6px;
        font:400 11px/1.4 'Press Start 2P',ui-monospace,monospace;}
.board .over, .board .over * {color:#fff !important; opacity:1 !important;}
.board .over .medal {font-size:44px; line-height:1; font-family:initial;}
.board .over small {font:600 12px/1.3 'DM Sans',Arial,sans-serif;}
.pnext {display:inline-flex; align-items:center; gap:5px; font:400 7px/1 'Press Start 2P',ui-monospace,monospace; color:var(--body-text-color-subdued);}
.pnext .mini {display:inline-grid; gap:0; background:#000; padding:2px; border:1px solid #6b6b6b;}
.pnext .mini i {display:block; width:6px; height:6px;}
.pnext .mini i[class^="c"] {box-shadow:inset 1px 1px 0 rgba(255,255,255,.55), inset -1px -1px 0 rgba(0,0,0,.5);}
@media (prefers-reduced-motion:reduce) {.board i.n {animation:none;}}
.pmove {font-size:11px; line-height:1.4; color:var(--body-text-color-subdued); min-height:4.3em;
        display:flex; flex-direction:column; gap:1px; cursor:help; overflow-wrap:anywhere;}
.pmove .act {color:var(--body-text-color); font-variant-numeric:tabular-nums;}
.pmove b {color:var(--body-text-color);}
.pmove .vg {color:#16a34a; font-weight:700;} .pmove .vb {color:#dc2626; font-weight:700;}
.results {width:100%; max-width:760px; margin:4px auto 0; border-collapse:collapse !important; font-size:13px; border:none !important;}
.results th, .results td {padding:6px 5px !important; border:none !important; border-bottom:1px solid var(--border-color-primary) !important;
        text-align:right; color:var(--body-text-color); font-variant-numeric:tabular-nums; background:transparent !important;}
.results td.p {min-width:8.5em;}
@media (max-width:480px) {.results .sm-hide {display:none;} .results {font-size:12px;}}
.results th {font-size:11px; text-transform:uppercase; letter-spacing:.04em; color:var(--body-text-color-subdued);}
.results td.l, .results th.l {text-align:left; overflow-wrap:break-word;}
.results .up {color:#16a34a;} .results .down {color:#dc2626;}
.rnote {font-size:12px; color:var(--body-text-color-subdued); margin:8px auto 0; max-width:760px; line-height:1.45;}
.rnote a {color:var(--link-text-color);}
.arena-empty {text-align:center; padding:40px 12px; color:var(--body-text-color-subdued); font-size:14px;
              border:1px dashed var(--border-color-primary); border-radius:10px;}
"""


def _board(game) -> str:
    hl = set(game.last_cells)
    cells = []
    for r in range(HEIGHT):
        row = game.grid[r]
        for c in range(WIDTH):
            v = row[c]
            if v:
                cells.append(f'<i class="c{v}{" n" if (r, c) in hl else ""}"></i>')
            else:
                cells.append("<i></i>")
    return "".join(cells)


def _next_html(piece) -> str:
    """Tiny NEXT box with the upcoming piece, like the original game's side panel."""
    cells = ROTATIONS[piece][0]
    rows = 1 + max(r for r, _ in cells)
    cols = 1 + max(c for _, c in cells)
    filled = set(cells)
    color = COLOR_ID[piece]
    blocks = "".join(f'<i class="c{color}"></i>' if (r, c) in filled else "<i></i>" for r in range(rows) for c in range(cols))
    return (f'<span class="pnext" title="next piece: {piece}">NEXT<span class="mini" '
            f'style="grid-template-columns:repeat({cols},6px)">{blocks}</span></span>')


def _last_move(game, player):
    """Two short lines: the action on the board, then the player's answer.
    Returns (html, tooltip) where the tooltip is the full outcome description."""
    if not game.last_piece:
        return "Waiting for the first piece…", ""
    action = f"{game.last_piece} → col {game.last_col}"
    if game.last_rotations > 1:
        action += f" · rot {game.last_rotation + 1}/{game.last_rotations}"
    if game.last_lines == 4:
        action += " · <b>TETRIS!</b>"
    elif game.last_lines:
        action += f" · <b>+{game.last_lines} line{'s' if game.last_lines > 1 else ''}</b>"
    n = game.last_options
    of_n = f" · {n} option{'s' if n != 1 else ''}" if n else ""
    pid = getattr(player, "model_id", "")
    if pid == "baseline/random":
        answer = f"<b>Random:</b> uniform pick{of_n}"
    elif pid.startswith("baseline/"):
        answer = f"<b>Rules:</b> fixed priorities{of_n}"
    elif game.last_value is not None:
        v = game.last_value
        verdict = "good move" if v > 0 else "bad move"
        answer = f'<b>Model:</b> <span class="{"vg" if v > 0 else "vb"}">“{verdict}”</span> {v:+.2f}{of_n}'
    else:
        answer = ""
    return f'<span class="act">{action}</span><span class="ans">{answer}</span>', html.escape(game.last_description)


def player_card(game, player, final_rank=None, elo=None) -> str:
    name = html.escape(player.display)
    params = "baseline" if not player.n_params else f"{player.n_params / 1e6:.1f}M params"
    over = ""
    if final_rank is not None:
        medal = MEDALS.get(final_rank, f"#{final_rank}")
        sub = "<small>survived</small>" if game.alive else ""
        elo_txt = ""
        if elo is not None:
            elo_txt = f"<small>Elo {elo[0]:.0f} → {elo[1]:.0f} ({elo[1] - elo[0]:+.1f})</small>"
        over = f'<div class="over"><span class="medal">{medal}</span>{sub}{elo_txt}</div>'
    elif not game.alive:
        over = '<div class="over">GAME OVER</div>'
    move, tip = _last_move(game, player)
    nxt = _next_html(game.current_piece) if game.alive else '<span class="pnext">NEXT –</span>'
    return (
        f'<div class="pcard"><div class="pname" title="{name}">{name}</div>'
        f'<div class="pmeta"><span>{params}</span>{nxt}</div>'
        f'<div class="pstats"><div><b>{game.score}</b><span>score</span></div>'
        f'<div><b>{game.lines}</b><span>lines</span></div><div><b>{game.pieces}</b><span>pieces</span></div></div>'
        f'<div class="board">{_board(game)}{over}</div>'
        f'<div class="pmove" title="{tip}">{move}</div></div>'
    )


def arena_html(games, players, ranks=None, elos=None) -> str:
    cards = []
    for i, (g, p) in enumerate(zip(games, players)):
        cards.append(player_card(g, p, ranks[i] if ranks else None, elos[i] if elos else None))
    return f'<div class="arena">{"".join(cards)}</div>'


def empty_html(msg="Pick the models and press <b>Start match</b>. The boards will appear here.") -> str:
    return f'<div class="arena-empty">{msg}</div>'


def results_html(order, ranks, players, games, elos, note_html) -> str:
    rows = []
    for i in order:
        p, g = players[i], games[i]
        if elos and elos[i] is not None:
            d = elos[i][1] - elos[i][0]
            cls = "up" if d > 0.05 else "down" if d < -0.05 else ""
            elo = f'{elos[i][1]:.0f} <span class="{cls}">({d:+.1f})</span>'
        else:
            elo = "–"
        medal = MEDALS.get(ranks[i], str(ranks[i]))
        alive = " ✓" if g.alive else ""
        rows.append(
            f'<tr><td class="l">{medal}</td><td class="l p">{html.escape(p.display).replace("/", "/<wbr>")}</td><td>{g.score}</td>'
            f'<td class="sm-hide">{g.lines}</td><td>{g.pieces}{alive}</td><td>{elo}</td></tr>'
        )
    head = ('<tr><th class="l">#</th><th class="l">Player</th><th>Score</th><th class="sm-hide">Lines</th>'
            "<th>Pieces</th><th>Elo</th></tr>")
    return f'<table class="results">{head}{"".join(rows)}</table><div class="rnote">{note_html}</div>'