import { grid, cols, rows } from './state.js';
import { config } from './config.js';
import { createCell } from './physics.js';

export function updateIce(x, y, cell) {
    const dxs = [0, 0, -1, 1];
    const dys = [-1, 1, 0, 0];

    for (let i = 0; i < 4; i++) {
        const nx = x + dxs[i];
        const ny = y + dys[i];
        if (nx >= 0 && nx < cols && ny >= 0 && ny < rows) {
            const neighbor = grid[nx][ny];
            if (neighbor) {
                const nt = neighbor.type;
                if (nt === 'fire' || nt === 'lava') {
                    // Melt immediately
                    grid[x][y] = createCell('water');
                    return;
                } else if (nt === 'steam') {
                    // Condenses steam into water
                    grid[nx][ny] = createCell('water');
                } else if (nt === 'water' && Math.random() < config.ice.freezeChance) {
                    // Freezes adjacent water into ice
                    grid[nx][ny] = createCell('ice');
                }
            }
        }
    }

    // Ambient melting if in hot conditions
    if (Math.random() < config.ice.meltChance * 0.05) {
        grid[x][y] = createCell('water');
    }
}