/**
 * Sheep Entity
 * Grazes on grass and dense flower tufts, flees from predators,
 * seeks mates when well-fed, and gives birth to growing baby sheep.
 */

import { Animal } from './animal.js';

export class Sheep extends Animal {
  constructor(x, y, isBaby = false) {
    super(x, y, 'sheep', isBaby);
    this.grazingTimer = 0;
  }

  update(dt, worldWidth, worldHeight, config, plants, wolves, allSheep, particleSystem, onBabyBorn, terrain = null) {
    if (this.isDead) return;

    // Deplete hunger over time using config
    this.hunger -= (config.sheepHungerDepletionRate || 1.2) * dt;

    // Base update (boundaries, health tick if starving, walk cycle)
    super.updateBase(dt, worldWidth, worldHeight, config);
    if (this.isDead) return;

    // Flock Separation: maintain personal space so sheep don't bunch into a single spot
    for (let i = 0; i < allSheep.length; i++) {
      const other = allSheep[i];
      if (other === this || other.isDead) continue;
      const dx = other.x - this.x;
      const dy = other.y - this.y;
      const dist = Math.hypot(dx, dy);
      const minFlockDist = 26 * this.growthScale;
      if (dist < minFlockDist && dist > 0.05) {
        const force = ((minFlockDist - dist) / minFlockDist) * 0.3;
        this.vx -= (dx / dist) * force;
        this.vy -= (dy / dist) * force;
      }
    }

    // 1. Check for nearby threats (Wolves) - TOP PRIORITY: FLEE!
    let nearestWolf = null;
    let minWolfDist = config.sheepPerceptionRadius || 160;

    for (let i = 0; i < wolves.length; i++) {
      const w = wolves[i];
      if (w.isDead) continue;
      const dist = Math.hypot(w.x - this.x, w.y - this.y);
      if (dist < minWolfDist) {
        minWolfDist = dist;
        nearestWolf = w;
      }
    }

    if (nearestWolf) {
      this.actionState = 'flee';
      const fleeSpeed = config.sheepFleeSpeed || 2.8;
      this.steerAwayFrom(nearestWolf.x, nearestWolf.y, fleeSpeed, worldWidth, worldHeight);
      return;
    }

    // 2. Mating Behavior:
    // If sheep is full, adult, and off cooldown -> search for another full sheep
    if (this.canMate()) {
      let nearestMate = null;
      let minMateDist = 180;

      for (let i = 0; i < allSheep.length; i++) {
        const s = allSheep[i];
        if (s === this || s.isDead || !s.canMate()) continue;
        const dist = Math.hypot(s.x - this.x, s.y - this.y);
        if (dist < minMateDist) {
          minMateDist = dist;
          nearestMate = s;
        }
      }

      if (nearestMate) {
        this.actionState = 'mating';
        const approachSpeed = config.sheepMaxSpeed || 1.8;
        this.steerTowards(nearestMate.x, nearestMate.y, approachSpeed);

        const collisionThreshold = (16 * this.growthScale) + (16 * nearestMate.growthScale);
        if (minMateDist <= collisionThreshold) {
          const cooldown = config.sheepMatingCooldown || 22;
          this.consumeMatingEnergy(cooldown);
          nearestMate.consumeMatingEnergy(cooldown);

          if (particleSystem) {
            particleSystem.emitHeart(this.x, this.y);
            particleSystem.emitHeart(nearestMate.x, nearestMate.y);
          }

          if (onBabyBorn) {
            const babyX = (this.x + nearestMate.x) / 2 + (Math.random() - 0.5) * 12;
            const babyY = (this.y + nearestMate.y) / 2 + (Math.random() - 0.5) * 12;
            onBabyBorn(babyX, babyY, 'sheep');
          }
        }
        return;
      }
    }

    // 3. Foraging / Grazing:
    // Sheep are active grazers — will seek and mow down plants if hunger < 96%
    if (this.hunger < 96 || this.isBaby) {
      let bestPlant = null;
      let bestScore = -Infinity;

      for (let i = 0; i < plants.length; i++) {
        const p = plants[i];
        if (p.isDead || p.growth < 0.25) continue;
        const dist = Math.hypot(p.x - this.x, p.y - this.y);
        if (dist > 280) continue;

        const flowerBonus = p.type === 'flower' ? 50 : 0;
        const score = 320 - dist + flowerBonus;
        if (score > bestScore) {
          bestScore = score;
          bestPlant = p;
        }
      }

      if (bestPlant) {
        this.actionState = 'seek_food';
        const dist = Math.hypot(bestPlant.x - this.x, bestPlant.y - this.y);
        const grazeReach = Math.max(18, (config.sheepGrazingReach || 18) * this.growthScale);

        if (dist <= grazeReach) {
          // Rapid chomp: instantly consume & remove plant node
          const nutrition = bestPlant.type === 'flower' ? 45 : 30;
          bestPlant.takeBite(); // removes the node immediately
          this.recordMeal(nutrition, particleSystem);

          if (terrain) {
            terrain.absorbDecalsNear(bestPlant.x, bestPlant.y, 25);
          }

          if (particleSystem) {
            particleSystem.emitEatingCrumbs(
              bestPlant.x,
              bestPlant.y,
              bestPlant.type === 'flower' ? bestPlant.flowerColor : '#48C738',
              5
            );
          }
        } else {
          this.steerTowards(bestPlant.x, bestPlant.y, config.sheepMaxSpeed || 1.8);

          // Maintain flock spacing during grazing approach
          for (let i = 0; i < allSheep.length; i++) {
            const other = allSheep[i];
            if (other === this || other.isDead) continue;
            const dx = other.x - this.x;
            const dy = other.y - this.y;
            const dist = Math.hypot(dx, dy);
            const minFlockDist = 26 * this.growthScale;
            if (dist < minFlockDist && dist > 0.05) {
              const force = ((minFlockDist - dist) / minFlockDist) * 0.35;
              this.vx -= (dx / dist) * force;
              this.vy -= (dy / dist) * force;
            }
          }
        }
        return;
      }
    }

    // 4. Default: Casual Wandering
    this.actionState = 'wander';
    this.wander(1.1);
  }

  draw(ctx) {
    if (this.isDead) return;

    ctx.save();
    const scale = this.growthScale;
    const px = Math.round(this.x);
    const py = Math.round(this.y - this.bobOffset);

    // Direction flip
    const facingLeft = Math.cos(this.heading) < 0;

    // Body dimensions
    const bodyW = Math.round(22 * scale);
    const bodyH = Math.round(16 * scale);
    const halfW = Math.round(bodyW / 2);
    const halfH = Math.round(bodyH / 2);

    // 1. Hooves (4 little black pixel feet bobbing)
    ctx.fillStyle = '#222224';
    const legW = Math.max(2, Math.round(3 * scale));
    const legH = Math.max(3, Math.round(5 * scale));
    const legBob1 = Math.round(Math.sin(this.walkCycle) * 2);
    const legBob2 = Math.round(Math.sin(this.walkCycle + Math.PI) * 2);

    // Front/Back legs
    ctx.fillRect(px - halfW + 3, py + halfH - 2 + legBob1, legW, legH);
    ctx.fillRect(px - halfW + 8, py + halfH - 2 + legBob2, legW, legH);
    ctx.fillRect(px + halfW - 9, py + halfH - 2 + legBob2, legW, legH);
    ctx.fillRect(px + halfW - 4, py + halfH - 2 + legBob1, legW, legH);

    // 2. Fluffy Wool Body (Squarish pixel block with wool puff corners)
    ctx.fillStyle = '#E8ECEF'; // main wool
    ctx.fillRect(px - halfW, py - halfH, bodyW, bodyH);

    // Wool shadow/shading underneath
    ctx.fillStyle = '#CBD2D8';
    ctx.fillRect(px - halfW, py + halfH - Math.round(4 * scale), bodyW, Math.round(4 * scale));

    // Wool puff details
    ctx.fillStyle = '#FFFFFF';
    ctx.fillRect(px - halfW + 2, py - halfH + 2, Math.round(6 * scale), Math.round(4 * scale));
    ctx.fillRect(px + 2, py - halfH + 2, Math.round(5 * scale), Math.round(3 * scale));

    // 3. Head & Ears
    const headW = Math.round(8 * scale);
    const headH = Math.round(9 * scale);
    const headX = facingLeft ? px - halfW - headW + 2 : px + halfW - 2;
    const headY = py - halfH + 1;

    ctx.fillStyle = '#2B2B2E'; // black sheep face
    ctx.fillRect(headX, headY, headW, headH);

    // Ears twitch
    const earX = facingLeft ? headX + headW - 2 : headX;
    ctx.fillStyle = '#1A1A1C';
    ctx.fillRect(earX, headY - Math.round(2 * scale), Math.round(3 * scale), Math.round(3 * scale));

    // Eye (little white pixel + pupil)
    const eyeX = facingLeft ? headX + 2 : headX + headW - 3;
    ctx.fillStyle = '#FFFFFF';
    ctx.fillRect(eyeX, headY + 2, Math.max(1, Math.round(2 * scale)), Math.max(1, Math.round(2 * scale)));

    // 4. Status Indicator (Fleeing panic / Mating heart / Baby icon)
    if (this.actionState === 'flee') {
      ctx.fillStyle = '#FF4444';
      ctx.font = 'bold 10px monospace';
      ctx.fillText('!', px - 2, py - halfH - 4);
    } else if (this.actionState === 'mating') {
      ctx.fillStyle = '#FF5588';
      ctx.font = '8px monospace';
      ctx.fillText('♥', px - 3, py - halfH - 4);
    }

    ctx.restore();
  }
}