from decimal import Decimal
import chanlun.core.ChanKLC as ChanKLC
from chanlun.core.ChanEnum import Chan_BI_DIR
class ChanBI():
	def __init__(self, klc: ChanKLC, index, ddir=Chan_BI_DIR.UP):
		self.start_klc = klc
		self.end_klc = klc
		self.next = None
		self.pre = None
		self.dir = ddir
		self.index = index
		self.is_sure = False
		self.high = klc.high
		self.low = klc.low
		self.sure_time = None
		self.klc_list = []
		self.klc_list.append(klc)
		self._klc_idx = {klc.index}
		self.end_time = klc.end_time
		self.start_time = klc.start_time
		self._macd_hist = 0
		self._macd_div = 0
		self._macd_dirty = False
		self.seg = None
		self.height = 0
		self.width = 0
		self.slop = 0
		self.fib_list = []
		self.seg_index = 0
		self.bi_zs = None
		self.seg_zs = None
	def set_bi_zs(self, bi_zs):
		for klc in self.klc_list:
			klc.set_bi_zs(bi_zs)
	def set_seg(self, seg):
		self.seg = seg
		self.seg_index = len(seg.bi_list)-1
	# macd_hist / macd_div 改为惰性。原来 add_klc 每加一根 KLC 就把整笔的
	# 所有 KLU 重新累加一遍，是 O(k²)；而这两个值只有背驰判定（bsp.py）在读，
	# lean 模式下 bsp 根本不算，等于全程白算。这里只标脏，取值时才算。
	# 语义不变：klc_list 只增不减（set_start_klc 会重置并同时清脏），
	# dir 在 klc 累加期间固定，所以延后到读取时算与逐次重算结果相同。
	@property
	def macd_hist(self):
		if self._macd_dirty:
			self.cal_macdhist()
		return self._macd_hist

	@macd_hist.setter
	def macd_hist(self, v):
		self._macd_hist = v
		self._macd_dirty = False

	@property
	def macd_div(self):
		self.cal_macd_div()
		return self._macd_div

	@macd_div.setter
	def macd_div(self, v):
		self._macd_div = v

	def set_macdhist(self, macd_hist):
		self.macd_hist = macd_hist
	def set_macd_div(self, macd_div):
		self.macd_div = macd_div
	def cal_macd_div(self):
		self._macd_div = 0.0
		if self.pre and self.pre.pre:
			if self.pre.pre.macd_hist == 0:
				self._macd_div = 0.0
			else:
				self._macd_div = self.macd_hist / self.pre.pre.macd_hist
			#print(self.start_time, self.end_time, self.macd_hist, self.pre.pre.macd_hist, self.macd_div)
	def cal_macdhist(self):
		self._macd_dirty = False
		self._macd_hist = 0
		up = self.dir == Chan_BI_DIR.UP
		acc = 0
		for klc in self.klc_list:
			for klu in klc.klu_list:
				h = klu.macdhist
				if up:
					if h > 0:
						acc += h
				elif h < 0:
					acc -= h
		self._macd_hist = acc
	def check_bi_zs_overlap(self):
		if self.next and self.next.next:
			if self.dir == Chan_BI_DIR.UP:
				return self.low < self.next.next.high
			else:
				return self.high > self.next.next.low
		else:
			return False
	def check_overlap(self):
		if self.next and self.next.next and self.next.next.is_sure:
			if self.dir == Chan_BI_DIR.UP:
				return self.high > self.next.low and self.high < self.next.next.high
			else:
				return self.high > self.next.high and self.low > self.next.next.low
		else:
			return False
	def set_end_klc(self, klc, sure_klc):
		if self.dir == Chan_BI_DIR.UP and klc.high > self.high:
			self.high = klc.high
		if self.dir == Chan_BI_DIR.DOWN and klc.low < self.low:
			self.low = klc.low
		self.end_klc = klc
		self.set_is_sure(True, sure_klc.end_time)
		self.end_time = klc.end_time
		self.cal_properties()
		#print(self.start_time, klc.fx, "This bi is ended", len(self.klc_list), klc.index - self.start_klc.index)
	def cal_properties(self):
		if self.is_sure:
			self.height = float(format(self.high - self.low, ".2f"))
			self.width = self.end_klc.index - self.start_klc.index
			self.slop = float(format(self.height / self.width, ".2f"))
			fib_list = [0.0, 0.236, 0.382, 0.5, 0.618, 0.786, 1.0]
			for fib in fib_list:
				self.fib_list.append(float(format(self.height * fib + self.low, ".2f")))
		#print(self.end_time, self.height, self.width, self.slop, self.fib_list)
	def set_is_sure(self, is_sure, time):
		self.is_sure = is_sure
		self.sure_time = time
	def set_start_klc(self, klc, ddir):
		self.start_klc = klc
		self.klc_list = []
		self.klc_list.append(klc)
		# klc_list 被整个换掉，去重集合与惰性缓存都要跟着重置，
		# 否则后续 add_klc 会以为旧下标还在里面而漏加
		self._klc_idx = {klc.index}
		self._macd_dirty = True
		self.high = klc.high
		self.low = klc.low
		self.dir = ddir
	def set_pre(self, bi):
		self.pre = bi
	def set_next(self, bi):
		self.next = bi
	def add_klc(self, klc):
		# 去重原本是对 klc_list 线性扫描，配合下面每次全量重算的 macdhist，
		# 让「往一笔里加 k 根 KLC」变成 O(k²)。改用下标集合，O(1)。
		if klc.index not in self._klc_idx:
			self._klc_idx.add(klc.index)
			self.klc_list.append(klc)
		self.end_klc = klc
		self.end_time = klc.klu_list[-1].time
		self._macd_dirty = True
	def append_klc_list(self, klc_list):
		self.klc_list.append(klc_list)
	def get_decimal(self, value):
		return Decimal("{:.2f}".format(value))
	def update_bi(self, klc):
		self.end_klc = None
		if self.dir == Chan_BI_DIR.UP and klc.high > self.high:
			self.high = klc.high
		if self.dir == Chan_BI_DIR.DOWN and klc.low < self.low:
			self.low = klc.low
		self.is_sure = False
		self.sure_time = None
		#print(self.start_time, klc.start_time, klc.fx, "This bi is extended")