import type { RoleRelationState } from '../types';

export type AffinityLevelId =
  | 'hostile'
  | 'guarded'
  | 'eased'
  | 'friendly'
  | 'trusted'
  | 'close';

export type AffinityLevelMeta = {
  id: AffinityLevelId;
  label: string;
  minAffinity: number;
  markerAffinity: number;
  nextAffinity: number | null;
  description: string;
  accentClassName: string;
  relationStance: RoleRelationState['stance'];
};

export const AFFINITY_PROGRESS_MIN = -40;
export const AFFINITY_PROGRESS_MAX = 90;

export const AFFINITY_LEVELS: AffinityLevelMeta[] = [
  {
    id: 'hostile',
    label: '敌对',
    minAffinity: Number.NEGATIVE_INFINITY,
    markerAffinity: AFFINITY_PROGRESS_MIN,
    nextAffinity: 0,
    description:
      '好感落入负值区间后，会按敌对关系处理，靠近时通常直接进入对战。',
    accentClassName: 'border-rose-300/28 bg-rose-500/14 text-rose-100',
    relationStance: 'hostile',
  },
  {
    id: 'guarded',
    label: '戒备',
    minAffinity: 0,
    markerAffinity: 0,
    nextAffinity: 15,
    description: '对方仍保持明显距离，只会给出谨慎而有限的回应。',
    accentClassName: 'border-white/12 bg-white/8 text-zinc-100',
    relationStance: 'guarded',
  },
  {
    id: 'eased',
    label: '缓和',
    minAffinity: 15,
    markerAffinity: 15,
    nextAffinity: 30,
    description:
      '戒备已经开始松动，愿意正常交流，也会试探性配合你的节奏。',
    accentClassName: 'border-sky-300/20 bg-sky-500/10 text-sky-100',
    relationStance: 'neutral',
  },
  {
    id: 'friendly',
    label: '友善',
    minAffinity: 30,
    markerAffinity: 30,
    nextAffinity: 60,
    description:
      '态度明显友善了许多，愿意配合行动，也会给出更真诚的反馈。',
    accentClassName:
      'border-emerald-300/20 bg-emerald-500/10 text-emerald-100',
    relationStance: 'cooperative',
  },
  {
    id: 'trusted',
    label: '信任',
    minAffinity: 60,
    markerAffinity: 60,
    nextAffinity: 90,
    description: '双方已经建立稳定信任，对方更愿意分享想法、资源和立场。',
    accentClassName: 'border-amber-300/20 bg-amber-500/10 text-amber-100',
    relationStance: 'bonded',
  },
  {
    id: 'close',
    label: '深交',
    minAffinity: 90,
    markerAffinity: 90,
    nextAffinity: null,
    description:
      '关系已经非常亲近，对方几乎把你视作可以托付后背的自己人。',
    accentClassName: 'border-rose-300/22 bg-rose-500/12 text-rose-100',
    relationStance: 'bonded',
  },
];

export const DEFAULT_AFFINITY_LEVEL = AFFINITY_LEVELS[0]!;

export const AFFINITY_PROGRESS_MARKERS = AFFINITY_LEVELS.map((level) => ({
  value: level.markerAffinity,
  label: level.label,
}));

export const AFFINITY_BACKSTORY_CHAPTER_THRESHOLDS = [
  getAffinityLevelMetaById('eased').minAffinity,
  getAffinityLevelMetaById('friendly').minAffinity,
  getAffinityLevelMetaById('trusted').minAffinity,
  getAffinityLevelMetaById('close').minAffinity,
] as const satisfies readonly [number, number, number, number];

export const DEFAULT_PRIVATE_CHAT_UNLOCK_AFFINITY =
  getAffinityLevelMetaById('trusted').minAffinity;

export function getAffinityLevelMetaById(levelId: AffinityLevelId) {
  const level = AFFINITY_LEVELS.find((entry) => entry.id === levelId);
  if (!level) {
    throw new Error(`Unknown affinity level id: ${levelId}`);
  }
  return level;
}

export function getAffinityLevelMeta(affinity: number) {
  return (
    [...AFFINITY_LEVELS]
      .reverse()
      .find((level) => affinity >= level.minAffinity) ?? DEFAULT_AFFINITY_LEVEL
  );
}

export function resolveRelationStanceFromAffinity(
  affinity: number,
): RoleRelationState['stance'] {
  return getAffinityLevelMeta(affinity).relationStance;
}