import { grid, cols, rows } from './state.js';
import { config } from './config.js';
import { move } from './actions.js';

export function updateWater(x, y, cell) {
    // Check for grass interaction (Growth)
    const neighbors = [[0, 1], [0, -1], [1, 0], [-1, 0]];
    for (let n of neighbors) {
        const nx = x + n[0], ny = y + n[1];
        if (nx >= 0 && nx < cols && ny >= 0 && ny < rows && grid[nx][ny] && grid[nx][ny].type === 'plant') {
            if (Math.random() < 0.005) { // Slower, but faster than dirt
                cell.type = 'plant';
                cell.color = '#228B22';
            }
            return;
        }
    }

    const below = y + 1;
    if (below >= rows) return;

    const belowCell = grid[x][below];
    if (!belowCell) {
        move(x, y, x, below);
    } else if (Math.random() < config.water.flowChance) {
        // Slide or flow sideways
        const left = x > 0 && !grid[x - 1][y];
        const right = x < cols - 1 && !grid[x + 1][y];
        
        if (left && right) move(x, y, Math.random() < 0.5 ? x - 1 : x + 1, y);
        else if (left) move(x, y, x - 1, y);
        else if (right) move(x, y, x + 1, y);
    }
}