/**
 * Plant & Flower Tuft Entity
 * Supports standard grass tufts and nutrient-dense flower tufts grown from decayed remains.
 * Features moisture loss, revival via rain, growth stages, and seed dispersal when clustered.
 */

export class Plant {
  constructor(x, y, type = 'grass', growth = 0.25, worldWidth = 1280, worldHeight = 760) {
    // Natural soft boundary matching meadow edge
    const margin = 20;
    this.x = Math.max(margin, Math.min(worldWidth - margin, x));
    this.y = Math.max(margin, Math.min(worldHeight - margin, y));
    this.type = type; // 'grass' or 'flower' (dense flower tuft)

    this.growth = growth; // 0.2 to 1.0
    this.growthRate = type === 'flower' ? 0.08 : 0.05;

    this.moisture = 100; // 0 to 100
    this.dryRate = 1.6;  // moisture loss per second

    this.age = 0;
    this.seedCooldown = 8 + Math.random() * 8; // initial jitter
    this.bitesRemaining = type === 'flower' ? 3 : 1; // dense tufts provide multiple meals

    this.isDead = false;
    this.swayOffset = Math.random() * Math.PI * 2;

    // Pick flower colors for flower tufts
    const flowerPalette = ['#FF2A6D', '#FFD166', '#05D9E8', '#9B5DE5', '#F15BB5'];
    this.flowerColor = flowerPalette[Math.floor(Math.random() * flowerPalette.length)];
  }

  receiveRain(amount) {
    this.moisture = Math.min(100, this.moisture + amount);
  }

  update(dt, allPlants, onSeedDispersed, onWithered, worldWidth, worldHeight, config = null, terrain = null) {
    if (this.isDead) return;

    this.age += dt;

    // As plants grow, they absorb surrounding blood/decay decals into nutrients!
    if (terrain && this.age < 8) {
      terrain.absorbDecalsNear(this.x, this.y, 30);
    }

    // 1. Dryness / moisture loss using config dry rate
    const dryRate = config && config.plantDryRate ? config.plantDryRate : 2.2;
    this.moisture -= dryRate * dt;
    if (this.moisture <= 0) {
      this.moisture = 0;
      this.isDead = true;
      if (onWithered) onWithered(this);
      return;
    }

    // 2. Growth
    if (this.growth < 1.0) {
      this.growth = Math.min(1.0, this.growth + this.growthRate * dt);
    }

    // 3. Proximity-based Seed Dispersal (heavily regulated to protect CPU & meadow balance)
    this.seedCooldown -= dt;
    if (this.seedCooldown <= 0 && this.growth >= 0.85 && this.age >= 24 && this.moisture >= 50) {
      this.seedCooldown = 24 + Math.random() * 18;

      const maxCap = config && config.maxPlantCap ? config.maxPlantCap : 90;
      if (allPlants.length >= maxCap) return;

      const seedChance = config && typeof config.plantSeedRate === 'number' ? config.plantSeedRate : 8;
      if (Math.random() * 100 > seedChance) return;

      // Check neighbor count: must have a close neighbor, but not overcrowded (< 3 in 55px)
      let neighborCount = 0;
      for (let i = 0; i < allPlants.length; i++) {
        const other = allPlants[i];
        if (other === this || other.isDead) continue;
        const dist = Math.hypot(other.x - this.x, other.y - this.y);
        if (dist <= 55) {
          neighborCount++;
        }
      }

      if (neighborCount >= 1 && neighborCount <= 3 && onSeedDispersed) {
        const angle = Math.random() * Math.PI * 2;
        const dist = 35 + Math.random() * 50;
        const safeMargin = 22;
        const targetX = Math.max(safeMargin, Math.min(worldWidth - safeMargin, this.x + Math.cos(angle) * dist));
        const targetY = Math.max(safeMargin, Math.min(worldHeight - safeMargin, this.y + Math.sin(angle) * dist));

        onSeedDispersed(this.x, this.y - 6, targetX, targetY);
      }
    }
  }

  takeBite() {
    // Sheep eating a plant completely consumes and removes the node
    this.bitesRemaining = 0;
    this.isDead = true;
    return true;
  }

  draw(ctx, simTime = 0) {
    if (this.isDead) return;

    ctx.save();
    const px = Math.round(this.x);
    const py = Math.round(this.y);
    const sway = Math.sin(simTime * 2.5 + this.swayOffset) * 1.5;

    // Color gradient based on moisture
    // Healthy: vibrant greens; Parched: pale yellow/olive; Withering: straw brown
    const moistPct = this.moisture / 100;
    let bladeColor = '#3CB043';
    let darkBladeColor = '#2B822F';

    if (moistPct < 0.3) {
      bladeColor = '#A89F58';     // withering straw
      darkBladeColor = '#8A8244';
    } else if (moistPct < 0.6) {
      bladeColor = '#77B847';     // slightly dry
      darkBladeColor = '#5C9132';
    }

    if (this.type === 'flower') {
      // --- DENSE FLOWER TUFT (High nutrition from decayed carcasses) ---
      const scale = this.growth;
      const w = Math.round(18 * scale);
      const h = Math.round(16 * scale);

      // Dense leafy foliage mound
      ctx.fillStyle = darkBladeColor;
      ctx.fillRect(px - Math.round(w / 2), py - 2, w, 4);

      // Lush pixel blades swaying
      ctx.fillStyle = bladeColor;
      ctx.fillRect(px - 6 + sway * 0.5, py - Math.round(h * 0.7), 2, Math.round(h * 0.7));
      ctx.fillRect(px - 2 + sway * 0.8, py - h, 3, h);
      ctx.fillRect(px + 3 + sway, py - Math.round(h * 0.85), 2, Math.round(h * 0.85));
      ctx.fillRect(px + 6 + sway * 0.6, py - Math.round(h * 0.6), 2, Math.round(h * 0.6));

      // Blossoms / Flowers (if mature)
      if (this.growth > 0.6) {
        // Main flower
        ctx.fillStyle = this.flowerColor;
        const fx = Math.round(px + sway * 0.8);
        const fy = Math.round(py - h - 1);
        ctx.fillRect(fx - 2, fy - 2, 5, 5);
        ctx.fillStyle = '#FFFFFF'; // flower center
        ctx.fillRect(fx, fy, 1, 1);

        // Secondary small blossom
        ctx.fillStyle = '#FFE66D';
        const fx2 = Math.round(px - 5 + sway * 0.5);
        const fy2 = Math.round(py - Math.round(h * 0.75));
        ctx.fillRect(fx2 - 1, fy2 - 1, 3, 3);
      }
    } else {
      // --- STANDARD GRASS TUFT ---
      const scale = this.growth;
      const h = Math.round(10 * scale);

      ctx.fillStyle = bladeColor;
      ctx.fillRect(px - 3 + sway * 0.6, py - Math.round(h * 0.8), 2, Math.round(h * 0.8));
      ctx.fillRect(px + sway, py - h, 2, h);
      ctx.fillRect(px + 3 + sway * 0.7, py - Math.round(h * 0.7), 2, Math.round(h * 0.7));

      // Root base dot
      ctx.fillStyle = darkBladeColor;
      ctx.fillRect(px - 2, py - 1, 5, 2);
    }

    // Optional subtle low-moisture alert dot if dying of thirst
    if (this.moisture < 25) {
      ctx.fillStyle = '#E63946';
      ctx.fillRect(px - 1, py - 16, 2, 2);
    }

    ctx.restore();
  }
}