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

export function updatePlant(x, y, cell) {
    // Woodification (Stalk formation)
    // Only turn to wood if supporting a column of plants (weight)
    let weight = 0;
    const requiredWeight = 5;
    for (let i = 1; i <= requiredWeight; i++) {
        if (y - i < 0) break;
        const above = grid[x][y - i];
        if (above && (above.type === 'plant' || above.type === 'wood')) {
            weight++;
        } else {
            break;
        }
    }

    if (weight >= requiredWeight) {
        if (Math.random() < config.plant.woodificationChance) {
            cell.type = 'wood';
            cell.color = '#8B4513';
            cell.updated = true;
            return;
        }
    }

    // Roots (Infects dirt)
    if (Math.random() < config.plant.growChance * 0.1) {
        const neighbors = [[0, 1], [0, -1], [1, 0], [-1, 0]];
        const n = neighbors[Math.floor(Math.random() * neighbors.length)];
        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 === 'dirt') {
            grid[nx][ny].type = 'plant';
            grid[nx][ny].color = '#228B22';
            grid[nx][ny].updated = true;
        }
    }
    
    // Organic Growth (Towards Sun)
    if (Math.random() < config.plant.growChance) {
        const growOptions = [
            { dx: 0, dy: -1 }, // Up
            { dx: 0, dy: -1 }, // Up
            { dx: 0, dy: -1 }, // Up
            { dx: 0, dy: -1 }, // Up
            { dx: -1, dy: -1 }, // Up-Left
            { dx: 1, dy: -1 }  // Up-Right
        ];
        const opt = growOptions[Math.floor(Math.random() * growOptions.length)];
        const nx = x + opt.dx, ny = y + opt.dy;
        if (nx >= 0 && nx < cols && ny >= 0 && ny < rows && !grid[nx][ny]) {
            grid[nx][ny] = { type: 'plant', color: '#228B22', updated: true };
        }
    }
}