// server/sim/content/kits/ops/op-cqbw.js — W (char_113_cqbw) 自选 operator kit: 6★ 炮手 (狙击), an owned-6★ pick of the
// tier-5 and tier-6 自选 slots; every skill, both talents, the trait, both modules (ART-X “佣兵的行囊”, ART-Y “刺棱钝刃”) at
// every form, and the kit of her summon “此面向敌” (token_10008_cqbw_box). Kit contract and the 自选 rules: ../README.md
// ("How to add an operator (自选)").
//
// Forms (data/backups.json units.char_113_cqbw, the DIY slot statuses): normal = E2 Lv1, skills at rank 4, no module;
// elite = E2 Lv60, rank 7, the picked module at stage 1 (tier 5) or 3 (tier 6) — the owner's decision of 2026-10-05.
// Full potential (the owner's decision of 2026-10-07). Sources: character_table / skill_table / battle_equip_table and the token record
// (zh_CN, as built into backups.json); PRTS W, 此面向敌 and 溅射半径一览 (the 备注 quoted below); the client's skill prefabs
// ([uc]skills skchr_cqbw_1 / 2 / 3, sktok_cqbw_token) and buff templates (cqbw_t_1, cqbw_t_2, cqbw_e_dmg,
// cqbw_e_sp[kill_with_projectile] / [kill_with_token], cqbw_e_003_t).
// - Trait (炮手) "攻击造成群体物理伤害": ranged physical, every enemy within SPLASH of the struck one takes the hit in full
//   (the aoesniper profile), air units too (data canHitFly); her 3-10, blocks 1, ground enemies target her (no flag).
//   PRTS 溅射半径一览 gives the 炮手 1.0 — the profile keeps the 扩散术师's 1.1 — so the kit's trait sets 1.0.
// - Module ART-X “佣兵的行囊” "攻击被阻挡的敌人时攻击力提升至110%" (trait bb atk_scale; cqbw_e_dmg: AtkScaleUp on every damage
//   she calculates, the cached D12 bombs included, when the target is blocked): ×atk_scale on her damage to a blocked
//   enemy — D12 only while she is on the field (PRTS "撤退W…炸弹无法享受W的天赋、模组的增益"); the module's token part gives
//   此面向敌 the same (its trait atk_scale, below). Stage 2+ changes 落井下石 (below).
// - Module ART-Y “刺棱钝刃” "攻击时无视敌人100点的防御力" (def_penetrate_fixed): defIgnoreFlat on her damage (D12 is 无来源, so
//   no source penetration reaches it — the engine's sourceless rule, PRTS 伤害分类). Stage 2+ changes 设伏 (below).
// - T1 设伏 "在战场停留10秒后获得60%的物理和法术闪避，且不容易成为敌人的攻击目标" (cqbw_t_1: the evade buff with taunt level −1,
//   lifetime ∞): `interval` s after each deployment, dodgePhys / dodgeArts `prob` and taunt taunt_level until she leaves.
//   ART-Y stage 3: 8 s, plus the hidden talent 2 (cqbw_e_003_t; PRTS 备注 "部署后每秒获得一层永久的攻击力提升效果（…3级时每层
//   1.25%攻击力，上限16层），受到伤害时…清空攻击力提升效果"): one stack of ATK +atk (直接乘算) every second from her deployment,
//   at most max_stack_cnt, all cleared by any damage she takes (a 流失, an element 损伤 or a dodged hit is none; a hit a
//   shield absorbs is one [ASSUMED]).
// - T2 落井下石 "攻击范围内的敌人在被晕眩时受到的物理伤害+18%" (full potential: +21%; cqbw_t_2 on the enemies of her range:
//   ON_TAKE_DAMAGE, STUNNED, DamageScale PHYSICAL): any physical damage, whoever deals it, on an enemy standing in her
//   attack range while it is 晕眩 (the catalogue stun — not 冻结 / 浮空) ×damage_scale; two W keep the strongest (同名 buff).
//   ART-X stage 2+ (+27 % at stage 3, full potential) adds "击倒敌人时获得1点技力" — PRTS 修正 "被自身的远程攻击击倒时" and
//   备注 "当受天赋影响的单位被W的弹道（包括D12的炸弹）击倒，W将恢复1点技力（无视阻回）…当此面向敌击倒敌人时，不论该敌人是否受天赋效果
//   影响，也会令W获得1点技力（无视阻回）": +sp SP (forced) when her projectile — a normal attack, 红桃K, a D12 bomb — knocks out an
//   enemy of her range, or one of her mines knocks out any enemy.
// - S1 红桃K (MANUAL, data DEFAULT): "立即发射一枚榴弹…并使命中目标晕眩" — cast like an attack (prefab
//   `_shouldCastLikeAttack`): the attack it is cast for throws the grenade at her target instead (an instant skill with
//   an attack override): atk_scale × ATK physical to every enemy within GRENADE_RADIUS (PRTS 备注 "榴弹爆炸范围半径为1.2"),
//   air units too (selector `_targetMotion` 3), each stunned `stun` s after its hit.
// - S2 惊吓盒子 (AUTO, data DEFAULT — "下次攻击变为…埋下地雷"): the attack it is cast for plants a 此面向敌 on a free deployable
//   tile of her range instead (melee or ranged: 此面向敌 "部署位置=全部位"). PRTS 备注: "攻击范围内不存在可部署位时，技能不会
//   发动" (the cast is refused and keeps its SP — prefab `_cancelIfSearchTargetFailed`), "召唤物部署优先级：可选敌人中点所在
//   地块（按地块上所有可选敌人中最高仇恨值降序）>距离其它可选敌人最近地块>其它地块（随机排序）" — targetable ground enemies
//   (the selector's `_targetMotion` 1), 仇恨值 read as her target order [ASSUMED], the nearest tile measured from its centre
//   to any such enemy of the field [ASSUMED], ties and the rest drawn with battle.rng — and "W撤退时撤退全部此面向敌" (her
//   knock-out too [ASSUMED]). No cap on the mines [ASSUMED: the token's maxDeployCount 1 is its deck limit; no source
//   caps what the skill lays].
//   此面向敌 (mineKit): untargetable [ASSUMED: a trap no enemy selects, as 香槟炸弹 — PRTS 实体类型 装置], blocks nothing, no
//   attack, lasts its talent `duration` (120 s). PRTS 此面向敌 备注 "受害者启动模式的触发及爆炸的半径均为1.35，触发后延迟1.5s
//   爆炸，不可对空", W 备注 "触发瞬间实时读取W的攻击力", 技能 备注 "该技能伤害会借用持有者的攻击力计算": a targetable ground
//   enemy within 1.35 arms it (W's ATK read then); 1.5 s later every targetable ground enemy within 1.35 takes atk_scale ×
//   that ATK physical (×its trait atk_scale on a blocked one: ART-X) and is stunned `stun` s; the mine is used up
//   (sktok_cqbw_token's suicide buff). The token skill's blackboard is the S2 blackboard of the form.
// - S3 D12 (MANUAL, data DEFAULT): cast like an attack — the attack it is cast for throws instead one bomb (a shell at
//   BOMB_SPEED [ASSUMED]) at each of the max_target enemies of her range with the most HP (current HP; air units too:
//   selector `_targetMotion` 3). PRTS 备注 "炸弹使用技能开启瞬间W的缓存攻击力，爆炸半径为1.2，延迟3s引爆，造成无来源的物理普通
//   伤害…被安装炸弹的目标被击倒/离场，或进入重生/消失状态时，炸弹会立刻提前引爆": BOMB_DELAY s after it lands — at once when
//   its target falls, leaves, hides or turns 无敌 + 无法选中 (重生), or when it had fallen before the bomb landed
//   [ASSUMED] — every targetable enemy within 1.2 of the bomb takes atk_scale × the cached ATK physical, 无来源 (credited to
//   her), and is stunned `stun` s.

import { num, traitBb, skillRec, up, statBuff } from '../shared/tier1.js';
import { sortEnemyTargets, canTargetEnemy } from '../../../targeting.js';
import { bodyInKeys } from '../../../body.js';
import { hasHp, isHpLoss } from '../../../damage.js';
import { COLS, PROJECTILE_SPEEDS } from '../../../constants.js';
import { hypot } from '../../../detmath.js';

const S1 = 'skchr_cqbw_1';
const S2 = 'skchr_cqbw_2';
const S3 = 'skchr_cqbw_3';
/** Her summon “此面向敌” (S2 惊吓盒子). */
export const MINE = 'token_10008_cqbw_box';
/** PRTS 溅射半径一览: 炮手 1.0. */
const SPLASH = 1.0;
/** PRTS S1 备注 "榴弹爆炸范围半径为1.2". */
const GRENADE_RADIUS = 1.2;
/** PRTS 此面向敌 备注 "触发及爆炸的半径均为1.35，触发后延迟1.5s爆炸". */
const MINE_RADIUS = 1.35;
const MINE_DELAY = 1.5;
/** 此面向敌's lifetime when its token record carries none (token talent `duration`: 120 s). */
const MINE_LIFE = 120;
/** PRTS S3 备注 "爆炸半径为1.2，延迟3s引爆". */
const BOMB_RADIUS = 1.2;
const BOMB_DELAY = 3;
/** D12's bombs fly as shells [ASSUMED: the engine's bomb projectile speed]. */
const BOMB_SPEED = PROJECTILE_SPEEDS.bomb;
/** 设伏 ART-Y: one ATK stack every second from the deployment (PRTS 备注 "部署后每秒获得一层"). */
const RAMP_IV = 1;
const AMBUSH_KEY = 'talent:cqbw:ambush';
const RAMP_KEY = 'talent:cqbw:ramp';
const MINE_TAG = 'cqbw:mine';
const D12_TAG = 'cqbw:d12';
const GROUND = Object.freeze({ canHitFly: false });
const AIR = Object.freeze({ canHitFly: true });
/** 落井下石's factor already applied to a damage instance (two W on one field keep the strongest). */
const STUN_SCALED = new WeakMap();

const bbOf = (chess, id) => skillRec(chess, id)?.bb ?? {};
/** Talent of data index `i` of the composed record (ART-Y's hidden talent 2 has no name). */
const talentAt = (chess, i) => (chess?.talents ?? []).find((t) => t && t.index === i) ?? null;
/** First talent of a normalised token def holding `key` (token talents keep no index). */
const tokTalent = (def, key) => (def?.talents ?? []).find((t) => t && t.bb && t.bb[key] != null) ?? null;
/** A mine of `unit`. */
const isMineOf = (t, unit) => !!t && t.kind === 'token' && t.defId === MINE && t.ownerUnit === unit;
/** 晕眩 (cqbw_t_2 checks STUNNED: the catalogue stun, not 冻结 / 浮空). */
const stunned = (e) => e.hasBuff('stun');
/** D12's early burst: the target fell, left, hides (消失) or is 无敌 + 无法选中 (重生). */
const gone = (e) => !e || !e.alive || e.hidden || !!(e.s.flags.invulnerable && e.s.flags.untargetable);

/** Free deployable tiles of her current range (melee or ranged: 此面向敌 "部署位置=全部位"). */
function mineTiles(battle, unit) {
  const out = [];
  for (const k of unit.rangeKeys ?? []) {
    const r = Math.floor(k / COLS), c = k % COLS;
    if (!battle.grid.inRect(r, c) || !battle.grid.canStand(r, c, { ranged: true }) || battle.isReservedTile(r, c)) continue;
    out.push([r, c]);
  }
  return out;
}

/** The tile 惊吓盒子 plants on (PRTS's priority, header), or null when her range has none free. */
function mineTile(battle, unit) {
  const tiles = mineTiles(battle, unit);
  if (!tiles.length) return null;
  const foes = battle.enemies.filter((e) => canTargetEnemy(unit, e, GROUND));
  if (!foes.length) return battle.rng.pick(tiles);
  // 可选敌人中点所在地块, by the enemies' order
  sortEnemyTargets(battle, unit, foes, null);
  const byKey = new Map(tiles.map((t) => [t[0] * COLS + t[1], t]));
  for (const e of foes) {
    const t = byKey.get(Math.round(e.y) * COLS + Math.round(e.x));
    if (t) return t;
  }
  // 距离其它可选敌人最近地块
  let best = [], bd = Infinity;
  for (const t of tiles) {
    let d = Infinity;
    for (const e of foes) d = Math.min(d, hypot(e.x - t[1], e.y - t[0]));
    if (d < bd - 1e-9) { bd = d; best = [t]; } else if (Math.abs(d - bd) <= 1e-9) best.push(t);
  }
  return best.length === 1 ? best[0] : battle.rng.pick(best);
}

/**
 * 此面向敌's kit (header). `owner` = W, `def` = the token def of her pick (the S2 blackboard of the form; ART-X: the
 * token trait atk_scale).
 */
function mineKit(owner, def) {
  const sk = def?.skill?.bb ?? {};
  const scale = num(sk.atk_scale), stun = num(sk.stun);
  const blocked = num(def?.traitBb?.atk_scale, 1);
  return {
    skill: {
      kind: 'passive',
      onTick({ battle, unit }) {
        if (!unit.alive || unit.mem.armed) return;
        if (!battle.foesInRadius(unit.x, unit.y, MINE_RADIUS, true).some((e) => !e.isFlying)) return;
        unit.mem.armed = true;
        const atk = up(owner) ? owner.s.atk : 0; // 触发瞬间实时读取W的攻击力
        battle.fx('telegraph', { x: unit.x, y: unit.y, id: unit.id, r: MINE_RADIUS, dur: MINE_DELAY });
        battle.after(MINE_DELAY, () => {
          if (!unit.alive) return; // withdrawn meanwhile (W left the field, its time ran out)
          for (const e of battle.foesInRadius(unit.x, unit.y, MINE_RADIUS, true)) {
            if (e.isFlying) continue; // 不可对空
            const mul = blocked !== 1 && e.blockedBy ? blocked : 1;
            battle.dealDamage(unit, e, { amount: atk * scale * mul, type: 'phys', isSkill: true, tags: ['summon', MINE_TAG] });
            if (stun > 0 && hasHp(e)) battle.applyStatus(e, 'stun', { duration: stun, source: unit });
          }
          battle.fx('aoe', { x: unit.x, y: unit.y, radius: MINE_RADIUS, id: unit.id, skill: MINE_TAG, consumed: true });
          battle.retreat(unit, { reason: 'expired', permanent: true });
        }, { owner: unit });
      },
    },
    trait: { noAttack: true },
  };
}

/**
 * D12: a bomb thrown at `target` (its cached ATK × scale, `mul` = ART-X's blocked factor while she stays on the field).
 * It sticks to the target and goes off BOMB_DELAY s after it landed, or at once when the target is gone.
 */
function throwBomb(battle, unit, target, cached, b3, blocked) {
  const scale = num(b3.atk_scale), stun = num(b3.stun);
  const burst = (x, y) => {
    const mul = up(unit) ? blocked : 1; // a withdrawn W lends her bombs no module
    battle.fx('aoe', { x, y, radius: BOMB_RADIUS, id: unit.id, skill: D12_TAG });
    for (const v of battle.foesInRadius(x, y, BOMB_RADIUS, true)) {
      const m = mul !== 1 && v.blockedBy ? mul : 1;
      battle.dealDamage(unit, v, { amount: cached * scale * m, type: 'phys', sourceless: true, isSkill: true, tags: ['skill', D12_TAG] });
      if (stun > 0 && hasHp(v)) battle.applyStatus(v, 'stun', { duration: stun, source: unit });
    }
  };
  battle.addProjectile({
    from: unit, target, speed: BOMB_SPEED, visual: 'bomb', source: unit, hitDead: true,
    onHit: (c) => {
      const e = c.target;
      if (gone(e)) { burst(c.x, c.y); return; } // its target fell before it landed: it goes off there [ASSUMED]
      const spot = { x: e.x, y: e.y };
      let done = false, watch = null, timer = null;
      const fire = () => {
        if (done) return;
        done = true;
        if (watch) battle.off(watch);
        if (timer) timer.cancel();
        burst(spot.x, spot.y);
      };
      watch = battle.on('tick', () => {
        if (gone(e)) { fire(); return; }
        spot.x = e.x; spot.y = e.y;
      });
      timer = battle.after(BOMB_DELAY, () => { if (!gone(e)) { spot.x = e.x; spot.y = e.y; } fire(); });
      battle.fx('lock', { x: e.x, y: e.y, id: e.id, skill: D12_TAG, dur: BOMB_DELAY });
    },
  });
}

export default {
  char_113_cqbw: (bb, chess) => {
    const t0 = talentAt(chess, 0)?.bb ?? {};     // 设伏 (ART-Y stage 3: interval 8)
    const ramp = talentAt(chess, 2)?.bb ?? {};   // ART-Y stage 3 hidden talent: atk / max_stack_cnt
    const t1 = talentAt(chess, 1)?.bb ?? {};     // 落井下石 (ART-X stage 2+: damage_scale, sp)
    const tb = traitBb(chess);                    // ART-X atk_scale · ART-Y def_penetrate_fixed
    const blocked = num(tb.atk_scale, 1);
    const b1 = bbOf(chess, S1), b3 = bbOf(chess, S3);
    return {
      trait: { splashRadius: SPLASH },
      skills: {
        [S1]: {
          kind: 'instant',
          attack: {
            atkScale: num(b1.atk_scale, 1),
            splashRadius: GRENADE_RADIUS,
            onEachHit({ battle, unit, target }) {
              const d = num(b1.stun);
              if (d > 0 && target && target.side === 'enemy' && hasHp(target)) battle.applyStatus(target, 'stun', { duration: d, source: unit });
            },
          },
        },
        [S2]: {
          kind: 'instant',
          onStart({ battle, unit }) {
            const tile = mineTile(battle, unit);
            if (!tile) return; // (the activate guard below refuses such a cast)
            unit.mem.cqbwCastAt = battle.time; // this attack plants the mine instead
            const def = battle.tokenDef(MINE, unit);
            const life = num(tokTalent(def, 'duration')?.bb?.duration, MINE_LIFE);
            const m = battle.spawnToken(unit, MINE, tile[0], tile[1], { kit: mineKit(unit, def), untargetable: true, duration: life });
            if (m) battle.fx('summon', { x: m.x, y: m.y, id: unit.id, token: MINE });
          },
        },
        [S3]: {
          kind: 'instant',
          onStart({ battle, unit }) {
            unit.mem.cqbwCastAt = battle.time; // this attack throws the bombs instead
            const cached = unit.s.atk * unit.s.atkScaleMul; // 技能开启瞬间的缓存攻击力
            const n = Math.max(1, Math.floor(num(b3.max_target, 3)));
            const pool = battle.enemiesInKeys(unit.rangeKeys, unit, AIR);
            for (const e of battle.blockedTargets(unit, AIR)) if (!pool.includes(e)) pool.push(e);
            sortEnemyTargets(battle, unit, pool, null);
            pool.sort((a, b) => b.hp - a.hp); // 生命值最多 (stable: her order breaks ties)
            for (const e of pool.slice(0, n)) throwBomb(battle, unit, e, cached, b3, blocked);
          },
        },
      },
      talents: [
        { install(battle, unit) { // 设伏 (+ ART-Y stage 3: ATK ramp, reset by damage)
          const iv = Math.max(0, num(t0.interval)), prob = num(t0.prob), taunt = num(t0.taunt_level);
          const per = num(ramp.atk), cap = Math.floor(num(ramp.max_stack_cnt));
          battle.on('deploy', (ctx) => {
            if (ctx.unit !== unit) return;
            const seq = unit.deploySeq;
            if (prob > 0 || taunt) {
              battle.after(iv, () => {
                if (!up(unit) || unit.deploySeq !== seq) return;
                battle.addBuff(unit, { key: AMBUSH_KEY, mods: { dodgePhys: prob, dodgeArts: prob, taunt }, tags: ['talent'], visible: true });
                battle.fx('buff', { x: unit.x, y: unit.y, id: unit.id, kind: 'cqbw:ambush' });
              }, { owner: unit });
            }
            if (per > 0 && cap > 0) {
              battle.every(RAMP_IV, (b, sched) => {
                if (!up(unit) || unit.deploySeq !== seq) { sched.cancel(); return; }
                battle.addBuff(unit, { key: RAMP_KEY, refresh: 'stack', maxStacks: cap, mods: { atkPct: per }, tags: ['talent'] });
              }, { owner: unit });
            }
          }, { owner: unit });
          if (per > 0 && cap > 0) {
            battle.on('damaged', (ctx) => {
              if (ctx.target !== unit || ctx.type === 'element' || isHpLoss(ctx.dmg)) return;
              if (unit.findBuff(RAMP_KEY)) battle.removeBuff(unit, RAMP_KEY);
            }, { owner: unit });
          }
        } },
        { install(battle, unit) { // 落井下石 (+ ART-X stage 2+: SP on her projectiles' / mines' knock-outs)
          const scale = num(t1.damage_scale, 1), sp = num(t1.sp);
          if (scale !== 1) {
            battle.on('hit', (ctx) => {
              const e = ctx.target, d = ctx.dmg;
              if (!e || e.side !== 'enemy' || d.type !== 'phys' || !up(unit) || !stunned(e) || !bodyInKeys(e, unit.rangeKeySet)) return;
              const prev = STUN_SCALED.get(d) ?? 1;
              if (!(scale > prev)) return;
              d.mul *= scale / prev;
              STUN_SCALED.set(d, scale);
            }, { owner: unit });
          }
          if (sp > 0) {
            battle.on('damaged', (ctx) => {
              const e = ctx.target, d = ctx.dmg;
              if (!e || e.side !== 'enemy' || !d || d.type === 'element' || hasHp(e) || !up(unit) || !unit.skill) return;
              const src = ctx.source;
              const shot = (src === unit && d.isAttack) || ((ctx.credit ?? src) === unit && d.tags?.includes(D12_TAG));
              if (isMineOf(src, unit) || (shot && bodyInKeys(e, unit.rangeKeySet))) unit.skill.gainSp(sp, 'init'); // 无视阻回
            }, { owner: unit });
          }
        } },
      ],
      install(battle, unit) {
        const sid = unit.skill?.id;
        // ART-X: 攻击被阻挡的敌人时攻击力提升至110% (her own damage; D12 and the mines apply it themselves)
        if (blocked !== 1) {
          battle.on('hit', (ctx) => {
            const t = ctx.target;
            if (ctx.source !== unit || !t || t.side !== 'enemy' || !t.blockedBy || ctx.dmg.type === 'element') return;
            ctx.dmg.amount *= blocked;
          }, { owner: unit });
        }
        // ART-Y: 攻击时无视敌人100点的防御力
        statBuff(battle, unit, 'trait:cqbw:pierce', { defIgnoreFlat: num(tb.def_penetrate_fixed) });
        // 惊吓盒子 / D12 are cast like an attack: the attack they are cast for makes no hit of its own
        if (sid === S2 || sid === S3) {
          battle.on('beforeAttack', (ctx) => {
            if (ctx.attacker !== unit || unit.mem.cqbwCastAt !== battle.time) return;
            unit.mem.cqbwCastAt = null;
            ctx.targets = [];
          }, { owner: unit, priority: 100 });
        }
        if (sid === S2) {
          // "攻击范围内不存在可部署位时，技能不会发动": every activation is refused while her range has no free deployable
          // tile — the SP stays (non-enumerable: never serialised; the pattern of 6_06 莎草)
          const sk = unit.skill;
          if (sk && !Object.prototype.hasOwnProperty.call(sk, 'activate')) {
            const activate = sk.activate;
            Object.defineProperty(sk, 'activate', {
              configurable: true, writable: true, enumerable: false,
              value(reason, opts) { return mineTiles(battle, unit).length ? activate.call(this, reason, opts) : false; },
            });
          }
          // W撤退时撤退全部此面向敌
          battle.on('death', (ctx) => {
            if (ctx.unit !== unit) return;
            for (const t of battle.allyUnits) if (t.alive && isMineOf(t, unit)) battle.retreat(t, { reason: 'expired', permanent: true });
          }, { owner: unit });
        }
      },
    };
  },
};