// 表情回执策略（用户指令 2026-08-07）：
//   - 收到用户消息 → 随机池取一枚表情（"已收到"即时反馈）
//   - 回合/任务完成 → 对触发消息打 DONE 表情
// 约束：DONE 永不参与随机池（任务完成标记专用）。

export const DONE_EMOJI = "DONE" as const;

/**
 * 飞书 reaction 接口支持的全部 emoji_type（open.feishu.cn …/emojis-introduce，
 * 2026-08-13 抓取）。大小写敏感（Fire 有效、FIRE 无效；AWESOMEN 有效、
 * AWESOME 无效）。用于过滤配置池里的非法值——否则随机抽到无效类型就 400
 * （code 231001 "reaction type is invalid"，用户"收到表情"落空）。
 */
export const VALID_EMOJI_TYPES: ReadonlySet<string> = new Set([
	"OK",
	"THUMBSUP",
	"THANKS",
	"MUSCLE",
	"FINGERHEART",
	"APPLAUSE",
	"FISTBUMP",
	"JIAYI",
	"DONE",
	"SMILE",
	"BLUSH",
	"LAUGH",
	"SMIRK",
	"LOL",
	"FACEPALM",
	"LOVE",
	"WINK",
	"PROUD",
	"WITTY",
	"SMART",
	"SCOWL",
	"THINKING",
	"SOB",
	"CRY",
	"ERROR",
	"NOSEPICK",
	"HAUGHTY",
	"SLAP",
	"SPITBLOOD",
	"TOASTED",
	"GLANCE",
	"DULL",
	"INNOCENTSMILE",
	"JOYFUL",
	"WOW",
	"TRICK",
	"YEAH",
	"ENOUGH",
	"TEARS",
	"EMBARRASSED",
	"KISS",
	"SMOOCH",
	"DROOL",
	"OBSESSED",
	"MONEY",
	"TEASE",
	"SHOWOFF",
	"COMFORT",
	"CLAP",
	"PRAISE",
	"STRIVE",
	"XBLUSH",
	"SILENT",
	"WAVE",
	"WHAT",
	"FROWN",
	"SHY",
	"DIZZY",
	"LOOKDOWN",
	"CHUCKLE",
	"WAIL",
	"CRAZY",
	"WHIMPER",
	"HUG",
	"BLUBBER",
	"WRONGED",
	"HUSKY",
	"SHHH",
	"SMUG",
	"ANGRY",
	"HAMMER",
	"SHOCKED",
	"TERROR",
	"PETRIFIED",
	"SKULL",
	"SWEAT",
	"SPEECHLESS",
	"SLEEP",
	"DROWSY",
	"YAWN",
	"SICK",
	"PUKE",
	"BETRAYED",
	"HEADSET",
	"EatingFood",
	"MeMeMe",
	"Sigh",
	"Typing",
	"Lemon",
	"Get",
	"LGTM",
	"OnIt",
	"OneSecond",
	"VRHeadset",
	"YouAreTheBest",
	"SALUTE",
	"SHAKE",
	"HIGHFIVE",
	"UPPERLEFT",
	"ThumbsDown",
	"SLIGHT",
	"TONGUE",
	"EYESCLOSED",
	"RoarForYou",
	"CALF",
	"BEAR",
	"BULL",
	"RAINBOWPUKE",
	"ROSE",
	"HEART",
	"PARTY",
	"LIPS",
	"BEER",
	"CAKE",
	"GIFT",
	"CUCUMBER",
	"Drumstick",
	"Pepper",
	"CANDIEDHAWS",
	"BubbleTea",
	"Coffee",
	"Yes",
	"No",
	"OKR",
	"CheckMark",
	"CrossMark",
	"MinusOne",
	"Hundred",
	"AWESOMEN",
	"Pin",
	"Alarm",
	"Loudspeaker",
	"Trophy",
	"Fire",
	"BOMB",
	"Music",
	"XmasTree",
	"Snowman",
	"XmasHat",
	"FIREWORKS",
	"REDPACKET",
	"FORTUNE",
	"LUCK",
	"FIRECRACKER",
	"StickyRiceBalls",
	"HEARTBROKEN",
	"POOP",
	"StatusFlashOfInspiration",
	"CLEAVER",
	"Soccer",
	"Basketball",
	"GeneralDoNotDisturb",
	"Status_PrivateMessage",
	"GeneralInMeetingBusy",
	"StatusReading",
	"StatusInFlight",
	"GeneralBusinessTrip",
	"GeneralWorkFromHome",
	"StatusEnjoyLife",
	"GeneralTravellingCar",
	"StatusBus",
	"GeneralSun",
	"GeneralMoonRest",
	"MoonRabbit",
	"Mooncake",
	"JubilantRabbit",
	"TV",
	"Movie",
	"Pumpkin",
	"BeamingFace",
	"Delighted",
	"ColdSweat",
	"FullMoonFace",
	"Partying",
	"GoGoGo",
	"ThanksFace",
	"SaluteFace",
	"Shrug",
	"ClownFace",
	"HappyDragon",
]);

/** 默认随机表情池（飞书 reaction emoji_type，全部排除 DONE）。
 * 2026-08-08 修复：FIRE → Fire（飞书 emoji_type 大小写敏感，FIRE 无效）。 */
export const REACTION_POOL: readonly string[] = [
	"THUMBSUP",
	"OK",
	"HEART",
	"LAUGH",
	"SMILE",
	"WOW",
	"CLAP",
	"Fire",
] as const;

/**
 * 从池中随机取一枚表情。
 * - 传入池为空 / 全为 DONE / 全为无效类型 → 回退默认池（默认池已排除 DONE）
 * - 无效类型（非飞书 emoji_type）会被过滤，避免 400（code 231001）
 * - 无论池内容如何，返回值永不为 DONE
 * - rng 可注入（测试确定性），默认 Math.random
 */
export function pickRandomReaction(
	pool: readonly string[] | undefined = REACTION_POOL,
	rng: () => number = Math.random,
): string {
	const source = pool && pool.length > 0 ? pool : REACTION_POOL;
	// 2026-08-13：过滤飞书不支持的 emoji_type（如 FIRE/AMAZE/AWESOME/COOL）——
	// 此前配置池含非法值时随机抽到就 400，用户收不到"已收到"表情。
	const valid = source.filter(
		(e) => e !== DONE_EMOJI && VALID_EMOJI_TYPES.has(e),
	);
	const usable = valid.length > 0 ? valid : REACTION_POOL;
	const idx = Math.floor(rng() * usable.length) % usable.length;
	// idx 恒在界内（对 length 取模），非空断言仅为满足 noUncheckedIndexedAccess
	return usable[idx] as string;
}