/**
 * 世界种子生成器（0.1.24《寰宇初构》）
 * 游戏种子 → 确定性世界布局：NPC 势力（4~8 家）/初始关系网/开局时代/区域风味/市场偏移。
 * 关键纪律：使用独立派生 rng（seed + '::worldgen'）——World.rng 主序列零消耗，
 * 玩家玩法随机序列不被生成器移动（金钟罩玩法序保护）；同 seed 世界可重放。
 */
import { Rng, seedToRng } from '../kernel/rng'
import { NpcFamilyDef } from '../../data/npcs'
import { registerNpcDef } from '../../data/npcs'

/** 老牌世家模板（创世第一轮种子池核心；worldgen 决定/谁出现） */
export const LEGACY_TEMPLATES: NpcFamilyDef[] = [
  { id: 'n-xuanying', name: '玄影沈氏', region: '北岳玄影峰', style: '剑修世家', desc: '隐于北岳的剑修沈氏，剑意凛冽，最为孤傲。', leaderRealm: 'foundation', initialPower: 240, powerGrowth: [4, 10], sells: ['weapon-qi', 'weapon-ling'], buys: ['lingcao', 'lingkuang'] },
  { id: 'n-danxin', name: '丹心木氏', region: '西川药谷', style: '丹道世家', desc: '悬壶济世的丹道世家，人脉广博，风格和缓。', leaderRealm: 'foundation', initialPower: 200, powerGrowth: [3, 9], sells: ['pill-qiyuan', 'pill-ningyuan', 'pill-pojing'], buys: ['lingcao', 'beastcore'] },
  { id: 'n-sihai', name: '四海王氏', region: '南都连港', style: '商盟世族', desc: '商通四海，富可敌国，只认灵石不认人。', leaderRealm: 'foundation', initialPower: 160, powerGrowth: [5, 12], sells: ['lingcao', 'lingkuang'], buys: ['beastcore', 'lingkuang'] },
  { id: 'n-nulei', name: '怒雷祝氏', region: '东丘雷泽', style: '兵修蛮门', desc: '雷泽蛮族的世仇，性情火爆，最易生衅。', leaderRealm: 'core', initialPower: 300, powerGrowth: [5, 13], sells: [], buys: ['lingkuang', 'beastcore'] }
]

/** 新贵词库（默认池——MOD/插件可注入扩展；默认不变 → 基准世界不变） */
const DEFAULT_GEN_STYLES = ['剑修世家', '丹道世家', '商盟世族', '兵修蛮门', '符箓仙门', '灵植谷户', '阵道门阀', '散修聚落']
const DEFAULT_GEN_REGIONS = ['北岳玄影峰', '西川药谷', '南都连港', '东丘雷泽', '南麓青泽', '西山雾谷', '东溪云汉', '北原古井']
const DEFAULT_GEN_SUFFIX = ['氏', '氏', '宗', '寨', '门']
const DEFAULT_GEN_FAM = ['玄', '墨', '楚', '白', '萧', '洛', '燕', '秦', '顾', '周', '华', '苏']

/** 聚合词库池（MOD/插件注入端；读取端 worldgen 消费） */
export const WorldGenPools = {
  styles: [...DEFAULT_GEN_STYLES],
  regions: [...DEFAULT_GEN_REGIONS],
  suffixes: [...DEFAULT_GEN_SUFFIX],
  fams: [...DEFAULT_GEN_FAM],
  add(part: { styles?: string[]; regions?: string[]; suffixes?: string[]; fams?: string[] }): void {
    if (part.styles) for (const s of part.styles) if (!this.styles.includes(s)) this.styles.push(s)
    if (part.regions) for (const r of part.regions) if (!this.regions.includes(r)) this.regions.push(r)
    if (part.suffixes) for (const s of part.suffixes) if (!this.suffixes.includes(s)) this.suffixes.push(s)
    if (part.fams) for (const f of part.fams) if (!this.fams.includes(f)) this.fams.push(f)
  },
  reset(): void {
    this.styles = [...DEFAULT_GEN_STYLES]
    this.regions = [...DEFAULT_GEN_REGIONS]
    this.suffixes = [...DEFAULT_GEN_SUFFIX]
    this.fams = [...DEFAULT_GEN_FAM]
  }
}

export interface WorldGenResult {
  seed: string
  npcs: NpcFamilyDef[]
  relations: Record<string, Record<string, number>>
  eras: 'shengshi' | 'pingshi' | 'luanshi'
  regionFlavor: Record<string, number>
  marketOffset: Record<string, number>
  alliances: Array<[string, string]>
  feuds: Array<[string, string]>
}

/** 世界生成（确定性；独立 rng） */
export function generateWorld(seed: string): WorldGenResult {
  const rng = new Rng(seedToRng(`${seed}::worldgen`))
  // 家数 4~8（乱世开局偏少）；老牌世家参与率 60~100%
  const count = 4 + rng.int(0, 4)
  const legacyPick = 1 + rng.int(0, 4) // 1~4 家老牌
  const legacy: NpcFamilyDef[] = []
  const pool = [...LEGACY_TEMPLATES]
  while (legacy.length < legacyPick && pool.length > 0) {
    const i = rng.int(0, pool.length - 1)
    legacy.push(pool[i]!)
    pool.splice(i, 1)
  }

  const usedRegions = new Set(legacy.map((l) => l.region))
  const usedNames = new Set(legacy.map((l) => l.name))
  const npcs: NpcFamilyDef[] = [...legacy]
  const frontier = count - legacy.length
  for (let k = 0; k < frontier; k++) {
    const region = WorldGenPools.regions.filter((r) => !usedRegions.has(r))
    const regionPick = region.length > 0 ? region[rng.int(0, region.length - 1)]! : WorldGenPools.regions[rng.int(0, WorldGenPools.regions.length - 1)]!
    const stylePick = WorldGenPools.styles[rng.int(0, WorldGenPools.styles.length - 1)]!
    usedRegions.add(regionPick)
    // 去重：家名组合回溯（同 seed 确定性；至多 8 次重抽）
    let fam = WorldGenPools.fams[rng.int(0, WorldGenPools.fams.length - 1)]!
    let suffix = WorldGenPools.suffixes[rng.int(0, WorldGenPools.suffixes.length - 1)]!
    let name = `${fam}${suffix}`
    for (let t = 0; t < 8 && usedNames.has(name); t++) {
      fam = WorldGenPools.fams[rng.int(0, WorldGenPools.fams.length - 1)]!
      suffix = WorldGenPools.suffixes[rng.int(0, WorldGenPools.suffixes.length - 1)]!
      name = `${fam}${suffix}`
    }
    usedNames.add(name)
    const power = 90 + rng.int(0, 130)
    npcs.push({
      id: `n-g${k + 1}-${fam}`,
      name: `${fam}${suffix}`,
      region: regionPick,
      style: stylePick,
      desc: `${stylePick}新立足${regionPick}，渐成气候。`,
      leaderRealm: power > 180 ? 'core' : 'foundation',
      initialPower: power,
      powerGrowth: [3, 10],
      sells: rng.chance(0.5) ? ['lingcao'] : [],
      buys: ['lingcao', 'lingkuang']
    })
  }
  // 注册动态 def（npcById 双源命中）
  for (const n of npcs) registerNpcDef(n)

  // 初始关系网：随机世仇 1-2 对 + 盟友 1 对 + 其余 ±20 漂移
  const relations: Record<string, Record<string, number>> = {}
  for (const a of npcs) relations[a.id] = {}
  const pairAll = (a: string, b: string, v: number) => {
    relations[a]![b] = v
    relations[b]![a] = v
  }
  const shuffle = [...npcs]
  for (let i = shuffle.length - 1; i > 0; i--) {
    const j = rng.int(0, i)
    ;[shuffle[i], shuffle[j]] = [shuffle[j]!, shuffle[i]!]
  }
  const feuds: Array<[string, string]> = []
  const alliances: Array<[string, string]> = []
  if (shuffle.length >= 2) {
    pairAll(shuffle[0]!.id, shuffle[1]!.id, -60 - rng.int(0, 20))
    feuds.push([shuffle[0]!.id, shuffle[1]!.id])
    if (shuffle.length >= 3) {
      pairAll(shuffle[2]!.id, shuffle[3]!.id, 45 + rng.int(0, 20))
      alliances.push([shuffle[2]!.id, shuffle[3]!.id])
    } else {
      pairAll(shuffle[0]!.id, shuffle[1]!.id, -60 - rng.int(0, 20))
    }
  }
  for (let i = 0; i < npcs.length; i++) {
    for (let j = i + 1; j < npcs.length; j++) {
      const a = npcs[i]!.id
      const b = npcs[j]!.id
      if (relations[a]?.[b] === undefined) {
        pairAll(a, b, rng.int(-25, 25))
      }
    }
  }

  // 开局 era：盛世/平世/乱世（乱世世界凶兆与繁华初现的分野）
  const eras = ['shengshi', 'pingshi', 'luanshi'] as const
  const eraPick = eras[rng.int(0, eras.length < 2 ? 0 : 2)]!

  // 区域风味（每 region 商品偏移 ±15%对称）
  const regionFlavor: Record<string, number> = {}
  for (const n of npcs) {
    regionFlavor[n.id] = (rng.next() - 0.5) * 0.3
  }
  const marketOffset: Record<string, number> = {
    lingcao: (rng.next() - 0.5) * 0.24,
    lingkuang: (rng.next() - 0.5) * 0.24,
    beastcore: (rng.next() - 0.5) * 0.24,
    'pill-qiyuan': (rng.next() - 0.5) * 0.18,
    'pill-ningyuan': (rng.next() - 0.5) * 0.18
  }

  return { seed, npcs, relations, eras: eraPick, regionFlavor, marketOffset, alliances, feuds }
}