# standard imports
import os
import logging
import datetime

logg = logging.getLogger().getChild(__name__)


class RunStore:

    def __init__(self, basedir='/run'):
        self.procstore = os.path.join(basedir, 'eth_stat_syncerd')


    def put(self, o, postfix):
        for k in o:
            file_path = os.path.join(self.procstore, postfix, k)
            d = os.path.dirname(file_path)
            try:
                os.stat(d)
            except FileNotFoundError:
                os.makedirs(d)
            f = open(file_path, 'w')
            f.write(str(o[k]))
            f.close()


class GasAggregator:

    def __init__(self, store, capacity):
        self.store = store
        self.avg = 0
        self.count = 0
        self.timestamp = datetime.datetime.utcnow()
        self.buffer_cursor = 0
        self.buffer_capacity = capacity
        self.buffer_average = [None] * self.buffer_capacity
        self.buffer_high = [None] * self.buffer_capacity
        self.buffer_low = [None] * self.buffer_capacity
        self.initial = False
        self.aggr = 0
        self.local_aggr = 0
        self.local_count = 0
        self.local_high = 0
        self.local_low = 0


    def put(self, v):
        self.local_aggr += v
        self.local_count += 1
        if self.local_low == 0:
            self.local_low = v
        if v > self.local_high:
            self.local_high = v
        elif v < self.local_low:
            self.local_low = v
        self.count += 1


    def process(self):
        if self.local_count == 0:
            logg.info('skipping 0 tx block')
            return False
        v = int(self.local_aggr / self.local_count)
        logg.info('calculated new block average {} from {} tx samples, low {} high {}'.format(v, self.local_count, self.local_low, self.local_high))
        self.local_aggr = 0
        self.local_count = 0
        if not self.initial:
            for i in range(self.buffer_capacity):
                self.buffer_average[i] = v
                self.buffer_high[i] = self.local_high
                self.buffer_low[i] = self.local_low
            self.initial = True
        else:
            self.buffer_average[self.buffer_cursor] = v
            self.buffer_low[self.buffer_cursor] = self.local_low
            self.buffer_high[self.buffer_cursor] = self.local_high
            self.buffer_cursor += 1
            self.buffer_cursor %= self.buffer_capacity

        self.aggr = self.avg * self.count
        self.aggr += v
        self.avg = int(self.aggr / self.count)
        logg.info('added {} to aggregate {} new average {} from {} samples'.format(v, self.aggr, self.avg, self.count))
        return True


    def get(self, n=0):
        if n == 0:
            n = self.capacity
        
        aggrs = {
                'average': 0,
                'low': 0,
                'high': 0,
                }
        for o in [
                (self.buffer_average, 'average',),
                (self.buffer_low, 'low',),
                (self.buffer_high, 'high',),
                ]:
            cursor = self.buffer_cursor 
            aggr = 0
            i = 0
            while i < n:
                v = o[0][cursor]
                aggrs[o[1]] += v
                cursor -= 1
                if cursor < 0:
                    cursor = self.buffer_capacity - 1
                i += 1
       
        return {
                'average': int(aggrs['average']/ n),
                'high': int(aggrs['high']/ n),
                'low': int(aggrs['low']/ n),
                }


    def block_callback(self, block, tx):
        logg.info('synced {}'.format(block))
        if self.process():
            last = self.get(1)
            self.store.put(last, 'block')
            minute = self.get(6)
            self.store.put(minute, 'minute')
            hour = self.get(360)
            self.store.put(hour, 'hour')
            self.store.put({
                'average': int(self.aggr / self.count),
                }, 'all')