class SnakeTable {
  static buildSnakesRows(turn, replay) {
    console.log(turn);

    const currentTurn = Number(turn && turn.turn !== undefined ? turn.turn : 0);
    const turns = replay && Array.isArray(replay.turns) ? replay.turns : [];
    const lastSeenById = new Map();
    const lastSeenTurnById = new Map();
    const aliveById = new Map();

    for (const historyTurn of turns) {
      const historyTurnNumber = Number(historyTurn && historyTurn.turn !== undefined ? historyTurn.turn : 0);
      if (historyTurnNumber > currentTurn) continue;
      for (const snake of (historyTurn.snakes || [])) {
        if (!snake) continue;
        const snakeId = snake.snake_id || snake.id || `${Utils.safeString(snake.snake_name)}-${historyTurnNumber}`;
        lastSeenById.set(snakeId, snake);
        lastSeenTurnById.set(snakeId, historyTurnNumber);
        if (historyTurnNumber === currentTurn) {
          aliveById.set(snakeId, snake);
        }
      }
    }

    const snakes = [];
    for (const [snakeId, snake] of lastSeenById.entries()) {
      const aliveSnake = aliveById.get(snakeId);
      snakes.push({
        ...(aliveSnake || snake),
        _snake_id: snakeId,
        _is_dead: !aliveSnake,
        _last_seen_turn: Number(lastSeenTurnById.get(snakeId) ?? currentTurn),
      });
    }

    snakes.sort((a, b) => {
      const youDelta = Number(Boolean(b.is_you)) - Number(Boolean(a.is_you));
      if (youDelta !== 0) return youDelta;
      const deadDelta = Number(Boolean(a._is_dead)) - Number(Boolean(b._is_dead));
      if (deadDelta !== 0) return deadDelta;
      return Utils.safeString(a.snake_name).localeCompare(Utils.safeString(b.snake_name));
    });

    const colorById = SnakeUtils.buildSnakeColorById(turn, replay);
    if (snakes.length === 0) {
      return "<tr><td colspan=\"7\">No snake data available</td></tr>";
    }

    return snakes.map((snake, idx) => {
      const healthValue = Number(snake.health ?? 0);
      const healthClamped = snake._is_dead ? 0 : Math.max(0, Math.min(100, healthValue));
      const healthColor = healthClamped > 60 ? "#28a264" : (healthClamped > 30 ? "#d39a1c" : "#c34939");
      const healthText = snake._is_dead ? "dead" : Utils.safeString(snake.health);
      const healthCell = `<span class="health-wrap"><span class="health-fill" style="width:${healthClamped}%;background:${healthColor};"></span></span><span class="health-text">${healthText}</span>`;
      const snakeId = snake._snake_id || snake.snake_id || snake.id || `${Utils.safeString(snake.snake_name)}-${idx}`;
      const rowColor = SnakeUtils.resolveSnakeColor(snakeId, snake.is_you, colorById);
      const rowBg = SnakeUtils.snakeRowBackground(rowColor);
      const rowStyle = `style="--snake-row-color:${rowColor};--snake-row-bg:${rowBg};"`;
      const diedTurn = Number(snake._last_seen_turn ?? currentTurn) + 1;
      const moveText = snake._is_dead ? `dead @ ${diedTurn}` : Utils.safeString(snake.inferred_move);
      const deadClass = snake._is_dead ? " dead-row" : "";
      const causeLabel = SnakeTable._getCauseLabel(snake, turns, replay);
      const deadLabel = snake._is_dead ? ` (dead${causeLabel})` : "";
      return `
        <tr class="snake-row${deadClass}" data-snake-id="${snakeId}" ${rowStyle}>
          <td class="name-cell">${Utils.safeString(snake.snake_name)}${snake.is_you ? " (you)" : ""}${deadLabel}</td>
          <td class="num-cell">${Utils.safeString(snake.latency)}</td>
          <td class="num-cell">${moveText}</td>
          <td class="num-cell">${healthCell}</td>
          <td class="num-cell">${Utils.safeString(snake.length)}</td>
          <td class="num-cell">${snake.head ? `${snake.head.x},${snake.head.y}` : "-"}</td>
          <td class="num-cell">${Array.isArray(snake.body) && snake.body.length > 0 ? `${snake.body[snake.body.length - 1].x},${snake.body[snake.body.length - 1].y}` : "-"}</td>
        </tr>`;
    }).join("");
  }

  static _getCauseLabel(snake, turns, replay) {
    if (!snake._is_dead) return "";
    const lastTurn = turns.find((t) => t && t.turn === snake._last_seen_turn);
    if (!lastTurn) return "";
    const lastSelf = (lastTurn.snakes || []).find((s) => (s.snake_id || s.id) === snake._snake_id);
    if (!lastSelf) return "";
    // Starvation: health ≤ 1 at last seen turn
    if (Number(lastSelf.health) <= 1) return " · starved";
    // Project head to next position based on body direction
    const body = Array.isArray(lastSelf.body) ? lastSelf.body : [];
    const h = lastSelf.head || (body[0] || null);
    const neck = body[1] || null;
    const projX = h && neck ? h.x + (h.x - neck.x) : null;
    const projY = h && neck ? h.y + (h.y - neck.y) : null;
    const nextTurn = turns.find((t) => t && t.turn === snake._last_seen_turn + 1);
    if (projX !== null) {
      const game = replay && replay.game ? replay.game : {};
      const bw = Number(game.width || 0);
      const bh = Number(game.height || 0);
      // Wall collision: projected head out of bounds
      if (bw > 0 && bh > 0 && (projX < 0 || projX >= bw || projY < 0 || projY >= bh)) {
        return " · wall";
      }
      if (nextTurn) {
        // Head-to-head: another alive snake's head at projected position
        for (const other of (nextTurn.snakes || [])) {
          const otherId = other.snake_id || other.id;
          if (otherId === snake._snake_id) continue;
          if (other.head && other.head.x === projX && other.head.y === projY) {
            return ` · head-to-head ${Utils.safeString(other.snake_name)}`;
          }
        }
        // Body collision: projected head inside another snake's body
        for (const other of (nextTurn.snakes || [])) {
          const otherId = other.snake_id || other.id;
          if (otherId === snake._snake_id) continue;
          const otherBody = Array.isArray(other.body) ? other.body : [];
          const hitBody = otherBody.some((seg, i) => i > 0 && seg.x === projX && seg.y === projY);
          if (hitBody) return ` · hit ${Utils.safeString(other.snake_name)}`;
        }
        // Hazard: projected position is in hazard list
        const hazards = nextTurn.hazards || [];
        if (hazards.some((hz) => hz.x === projX && hz.y === projY)) return " · Hazard";
      }
    }
    return "";
  }
}