// The splatter phase: shamblers, gore decals, particles. The ball is the weapon;
// tennis scoring keeps running via gameplay.splatPoint. Zombies advance toward
// your baseline — one crossing it is a point for THEM.
// (zombies <-> gameplay is a runtime-only import cycle, same pattern as input.)

import { TUNE, COURT } from './config.js';
import { G, P, ball, sendBoy, setupPoint } from './state.js';
import { splat, moan, pock, voice, boom, swish } from './audio.js';
import { splatPoint, cheer, spentBall } from './gameplay.js';

export const zombies = []; // {x, z, v, walkT, variant: 'a'|'b'|'c'}
export const gore = [];    // lawn decals {x, z, r, a}  — the flat ground layer
export const piles = [];   // 3D-ish gore mounds {x, z, size 1..4, seed} — grow where kills cluster
export const parts = [];   // splatter particles {x, y, z, vx, vy, vz, t, dark}
export const pellets = []; // machine-gun rounds during a horde {x, y, z, vx, vz, t}

let spawnT = 1.5, moanT = 3;

export function spawnZombie(x, z, variant) {
  const ramp = 1 + Math.min(1.5, G.splatT / 70); // they get faster the longer you survive
  zombies.push({ x, z, v: TUNE.zSpeed * ramp * (0.8 + Math.random() * 0.4), walkT: Math.random() * 9, variant });
}

// core kill: remove the zombie, spawn its gore/pile/particles, score. No ball coupling —
// shared by ball hits, machine-gun pellets, melee swipes, and extra (multi-serve) balls.
function killZombie(i, quiet) {
  const zb = zombies[i];
  zombies.splice(i, 1);
  gore.push({ x: zb.x, z: zb.z, r: 0.45 + Math.random() * 0.35, a: 0.85 });
  if (gore.length > 40) gore.shift();
  const pl = piles.find(p => Math.hypot(p.x - zb.x, p.z - zb.z) < 0.6); // stack up where kills cluster
  if (pl) pl.size = Math.min(4, pl.size + 1);
  else { piles.push({ x: zb.x, z: zb.z, size: 1, seed: Math.random() * 1e4, blobs: null, builtSize: 0 });
         if (piles.length > 30) piles.shift(); }
  for (let k = 0; k < 24; k++) { const dark = k >= 16; parts.push({ // ~1/3 dark & long-lived: settling gore
    x: zb.x, y: 0.9, z: zb.z,
    vx: (Math.random() * 2 - 1) * 3.5, vy: 1 + Math.random() * 3.5, vz: (Math.random() * 2 - 1) * 3.5,
    t: dark ? 0.6 + Math.random() * 0.6 : 0.4 + Math.random() * 0.4, dark,
  }); }
  splat();
  sendBoy(zb.x, zb.z);            // a boy sprints out to mop
  if (!G.horde) splatPoint('P', quiet); // a horde is survival — it doesn't score, so it can't chain into itself
}

// swishing the racket cleaves any shambler in reach (the racket-zombie boss shrugs melee off)
export function meleeSwipe(x, z, range) {
  let hit = 0;
  for (let i = zombies.length - 1; i >= 0; i--) {
    if (zombies[i].variant === 'r') continue;
    if (Math.hypot(zombies[i].x - x, zombies[i].z - z) < range) { killZombie(i, !!G.horde); hit++; }
  }
  if (hit) swish(0.35);
  return hit;
}

function splatter(i, fanfare = true) { // the MAIN ball hit a zombie
  killZombie(i, !!G.horde);
  ball.vx *= TUNE.zPierce; ball.vz *= TUNE.zPierce; // keep enough pace to plow through the next
  if (!fanfare) return;           // machine-gun pellets splatter but skip the streak fanfare / bomb meter
  ball.kills++;                   // this shot's running streak
  // escalating multi-kill fanfare — one shot, ≥2 zombies
  if (ball.kills === 2) { G.flash = { text: 'DOUBLE KILL', t: 0.9 }; cheer(1.6, 0.45); voice('double_kill', 0.4); }
  else if (ball.kills === 3) { G.flash = { text: 'TRIPLE KILL', t: 0.9 }; cheer(2.2, 0.6); voice('triple_kill', 0.4); }
  else if (ball.kills >= 4) { G.flash = { text: `MASSACRE ×${ball.kills}`, t: 0.9 }; cheer(2.8, 0.7); voice('unbelievable', 0.4); }
  // bomb-ball reward: every bombEvery kills a boy delivers one (up to bombMax in stock)
  if (++G.killMeter >= TUNE.bombEvery) {
    G.killMeter = 0;
    if (G.bombs < TUNE.bombMax) { G.bombs++; sendBoy(); voice('new_balls', 0.2); G.flash = { text: 'BOMB BALL', t: 0.9 }; }
  }
}

// ---- horde wave: dense spawns + an auto-firing machine-gun racket (pellets, not the match ball)
function spawnHordeZombie() { // all from the far baseline, across the court — never off-screen at the sides
  spawnZombie((Math.random() * 2 - 1) * 5, -1.5 - Math.random(), Math.random() < 0.5 ? 'a' : 'b');
}
function firePellet() {
  const a = (Math.random() * 2 - 1) * 4 * Math.PI / 180, s = 26; // ±4° spread, straight up-court (-z)
  pellets.push({ x: P.x, y: 0.9, z: P.z, vx: Math.sin(a) * s, vz: -Math.cos(a) * s, t: 1.2 });
  pock(0.25, 1400); // rapid fire tick; if it clips on device, gate to every 2nd pellet
}
function spawnRacketZombie() { // one takes up residence on the far court each horde you survive
  zombies.push({ x: (Math.random() * 2 - 1) * 2.5, z: 3.5, v: 0, walkT: Math.random() * 9,
    variant: 'r', side: 'O', facing: 1, pose: 'idle', poseT: 0, swingT: -1, swingCool: 0, runT: 0, hp: TUNE.racketHp });
}
function endHorde() {
  G.horde = null; pellets.length = 0;
  spawnRacketZombie();             // survive the wave → a racket zombie stays to rally you
  setupPoint();                    // serve loop resumes; any zombies still standing are yours to mop up
  voice('quiet_dark', 0.5, 0.85);
}
function tickHorde(dt) {
  const h = G.horde;
  h.t -= dt;
  if ((h.spawnT -= dt) <= 0) { spawnHordeZombie(); h.spawnT = 1 / TUNE.hordeRate; }
  if ((h.mgT -= dt) <= 0) { firePellet(); h.mgT = 1 / TUNE.mgRate; }
  if (h.t <= 0) endHorde();
}

// bomb ball: everything inside bombRadius splatters at once (each kill still ++ball.kills so
// the Phase-2 fanfare escalates), plus a crater — big stain, size-3 pile, extra particles, boom.
export function explode(x, z) {
  for (let i = zombies.length - 1; i >= 0; i--) // backwards: splatter() splices the array
    if (Math.hypot(zombies[i].x - x, zombies[i].z - z) < TUNE.bombRadius) splatter(i);
  gore.push({ x, z, r: 1.4, a: 0.9 }); if (gore.length > 40) gore.shift();
  const pl = piles.find(p => Math.hypot(p.x - x, p.z - z) < 0.6);
  if (pl) pl.size = Math.min(4, pl.size + 3);
  else { piles.push({ x, z, size: 3, seed: Math.random() * 1e4, blobs: null, builtSize: 0 }); if (piles.length > 30) piles.shift(); }
  for (let k = 0; k < 40; k++) parts.push({
    x, y: 0.6, z, vx: (Math.random() * 2 - 1) * 6, vy: 1 + Math.random() * 5, vz: (Math.random() * 2 - 1) * 6,
    t: 0.5 + Math.random() * 0.7, dark: k % 2 === 0,
  });
  G.hitstop = 0.1; boom();
}

export function updateZombies(dt) {
  moanT -= dt;
  if (moanT <= 0) { moan(); moanT = 2.5 + Math.random() * 4; }

  if (G.mode === 'splatter') { // transition spawns are scripted, not timed
    G.splatT += dt;
    if (G.horde) tickHorde(dt); // horde: dense spawns + machine gun, ignores the cap
    else if (!G.changeover) {   // changeovers are a real breather — no fresh spawns
      spawnT -= dt;
      // the spawn director: the match's age (games finished) sets both crowd size and tempo
      const cap = Math.min(TUNE.zMaxCap, TUNE.zMax + G.runGames);
      if (spawnT <= 0 && zombies.length < cap) {
        spawnZombie((Math.random() * 2 - 1) * 4.8, -1.5 - Math.random(), Math.random() < 0.5 ? 'a' : 'b');
        spawnT = Math.max(TUNE.zSpawnMin, TUNE.zSpawnEvery - G.runGames * TUNE.zSpawnStep);
      }
    }
  }

  for (let i = zombies.length - 1; i >= 0; i--) {
    const zb = zombies[i];
    zb.walkT += dt;
    zb.z += zb.v * dt;
    if (zb.variant === 'r') { /* the racket boss holds station — its AI owns its x */ }
    else if (G.mode === 'splatter' && zb.z > COURT.netZ) // on YOUR half they home in on you
      zb.x += Math.sign(P.x - zb.x) * Math.min(Math.abs(P.x - zb.x), zb.v * 0.7 * dt);
    else
      zb.x += Math.sin(zb.walkT * 1.7) * 0.15 * dt; // far half: aimless shamble
    if (G.mode === 'splatter' && Math.hypot(zb.x - P.x, zb.z - P.z) < 0.7) { // it got you
      gore.push({ x: P.x, z: P.z, r: 0.9, a: 0.9 });
      for (let k = 0; k < 30; k++) parts.push({
        x: P.x, y: 1.1, z: P.z,
        vx: (Math.random() * 2 - 1) * 4.5, vy: 1 + Math.random() * 4, vz: (Math.random() * 2 - 1) * 4.5,
        t: 0.5 + Math.random() * 0.5,
      });
      splat(1);
      voice('game_set_massacre', 0.8);
      G.mode = 'eaten'; ball.active = false; G.flash = null; // zombies keep shambling for ambience
      G.horde = null; pellets.length = 0;                    // the swarm stops; the eaten screen takes over
      try { // the run is over — settle it against the best (games survived, sets as tiebreak)
        const b = JSON.parse(localStorage.splatterBest || 'null') || { games: 0, sets: 0 };
        if (G.runGames > b.games) { b.games = G.runGames; b.sets = G.sets[0]; localStorage.splatterBest = JSON.stringify(b); }
        G.best = b;
      } catch (e) { G.best = null; } // private mode etc. — the summary just skips the best line
    }
    if (ball.active && ball.lastHit === 'P' && ball.y < 1.9) {
      const d = Math.hypot(ball.x - zb.x, ball.z - zb.z);
      if (d < 0.55) {
        if (ball.bomb) { // detonate on first contact, whatever the pace
          explode(ball.x, ball.z); ball.bomb = false;
          spentBall(); break; // zombies mutated — stop this frame's loop
        }
        if (zb.variant === 'r') { // mini-boss: splat-quality wounds it; soft balls it rallies (racketAI)
          if ((ball.pow || 0) >= TUNE.zSplatQ) {
            zb.hp--; splat(0.5); pock(0.6, 300);
            ball.vx *= 0.3; ball.vz *= 0.3; ball.lastHit = 'X'; // spent on the hit
            if (zb.hp <= 0) { splatter(i); continue; }         // killing blow: full gore + point
          }
          continue; // soft balls pass through, for the AI to return
        }
        if ((ball.pow || 0) >= TUNE.zSplatQ) { splatter(i); continue; }
        zb.z -= TUNE.zPushback; // weak sitters only stagger them
        pock(0.6, 300);
        ball.vx *= 0.6; ball.vz *= 0.6; ball.lastHit = 'X'; // spent — one stagger per ball
      }
    }
    if (zb.z >= COURT.L + 0.7) { zombies.splice(i, 1); if (G.mode !== 'eaten' && !G.horde) splatPoint('O'); } // it reached your baseline
  }

  for (let i = pellets.length - 1; i >= 0; i--) { // machine-gun rounds: flat, fast, one-shot kills
    const pe = pellets[i];
    pe.t -= dt; pe.x += pe.vx * dt; pe.z += pe.vz * dt;
    let hit = false;
    for (let j = zombies.length - 1; j >= 0; j--)
      if (zombies[j].variant !== 'r' && Math.hypot(zombies[j].x - pe.x, zombies[j].z - pe.z) < 0.55) { killZombie(j, true); hit = true; break; }
    if (hit || pe.t <= 0) pellets.splice(i, 1);
  }

  for (let i = parts.length - 1; i >= 0; i--) {
    const p = parts[i];
    p.t -= dt; p.vy -= 14 * dt;
    p.x += p.vx * dt; p.y += p.vy * dt; p.z += p.vz * dt;
    if (p.y < 0) { p.y = 0; p.vy = 0; p.vx *= 0.5; p.vz *= 0.5; }
    if (p.t <= 0) parts.splice(i, 1);
  }

  const boy = G.boy; // the boy mops any gore he passes over
  for (let i = gore.length - 1; i >= 0; i--) {
    const d = gore[i];
    if (boy && Math.abs(boy.x - d.x) < 0.7 && Math.abs(boy.z - d.z) < 1.2) d.a -= dt * 1.6;
    if (d.a <= 0) gore.splice(i, 1);
  }
  for (let i = piles.length - 1; i >= 0; i--) { // piles shave far slower than stains — net growth wins
    const pl = piles[i];
    if (boy && Math.abs(boy.x - pl.x) < 0.7 && Math.abs(boy.z - pl.z) < 1.2) pl.size -= dt * 0.25;
    if (pl.size <= 0.3) piles.splice(i, 1);
  }
}