import type { World } from '../engine/world'

/**
 * 统一时轮调度：所有系统以 phase 注册，由时钟按固定顺序驱动。
 * - 月度 phase：production / aging / cultivation / missions / events / diplomacy / epilogue
 * - 年首钩子：onYearStart（婚配 → 声望岁贡 → 岁末族簿）
 * 新增系统 = 注册一行，不再修改 advanceMonth 本体。
 */

export type PhaseId =
  | 'production'
  | 'aging'
  | 'cultivation'
  | 'missions'
  | 'events'
  | 'diplomacy'
  | 'epilogue'

export type SystemHook = (w: World) => void

export interface PhaseStat {
  phase: PhaseId
  ms: number
  count: number
}

export const PHASE_ORDER: PhaseId[] = [
  'production',
  'aging',
  'cultivation',
  'missions',
  'events',
  'diplomacy',
  'epilogue'
]

export class GameClock {
  private monthly = new Map<PhaseId, SystemHook[]>()
  private yearly: SystemHook[] = []

  register(phase: PhaseId, fn: SystemHook): void {
    const list = this.monthly.get(phase) ?? []
    list.push(fn)
    this.monthly.set(phase, list)
  }

  onYearStart(fn: SystemHook): void {
    this.yearly.push(fn)
  }

  fireYearStart(w: World): void {
    for (const fn of this.yearly) fn(w)
  }

  stepMonthly(w: World): PhaseStat[] {
    const report: PhaseStat[] = []
    for (const phase of PHASE_ORDER) {
      const t0 = performance.now()
      const fns = this.monthly.get(phase) ?? []
      for (const fn of fns) fn(w)
      const ms = performance.now() - t0
      report.push({ phase, ms, count: fns.length })
    }
    return report
  }

  subscriptionCount(): number {
    let n = 0
    for (const list of this.monthly.values()) n += list.length
    return n + this.yearly.length
  }
}