#!/usr/bin/env python3
#
# mmgen = Multi-Mode GENerator, command-line Bitcoin cold storage solution
# Copyright (C)2013-2017 Philemon <mmgen-py@yandex.com>
#
# This program is free software: you can redistribute it and/or modify it under
# the terms of the GNU General Public License as published by the Free Software
# Foundation, either version 3 of the License, or (at your option) any later
# version.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
# details.
#
# You should have received a copy of the GNU General Public License along with
# this program.  If not, see <http://www.gnu.org/licenses/>.

"""
mmgen-blocks-info: Display information about a block or range of blocks
"""

import time,re
from mmgen.common import *

opts_data = lambda: {
	'desc':    'Display information about or find a transaction within a range of blocks',
	'usage':   '[opts] +<last n blocks>|<block num>|<block num range>',
	'options': """
-h, --help            Print this help message
--, --longhelp        Print help message for long options (common options)
-H, --hashes          Display only block numbers and hashes
-m, --miner-info      Display miner info in coinbase transaction
-n, --nya             Display NYA (New York Agreement) support
-M, --raw-miner-info  Display miner info in uninterpreted form
-s, --summary         Print the summary only
-t, --transaction=t   Search for transaction 't' in specified block range

If no block number is specified, the current block is assumed
"""
}

cmd_args = opts.init(opts_data)

if len(cmd_args) not in (0,1): opts.usage()
if opt.raw_miner_info: opt.miner_info = True

c = rpc_init()
cur_blk = c.getblockcount()

arg = cmd_args[0] if cmd_args else None

if not arg:
	first = last = cur_blk
elif arg[0] == '+' and is_int(arg[1:]):
	last = cur_blk
	first = last - int(arg[1:]) + 1
elif is_int(arg):
	first = last = int(arg)
else:
	try:
		a,b = arg.split('-')
		assert is_int(a) and is_int(b)
		first,last = int(a),int(b)
	except:
		opts.usage()

if first > last:
	die(2,'{}: invalid block range'.format(arg))
if last > cur_blk:
	die(2,'Requested block number ({}) greater than current block height'.format(last))

if opt.summary:
	pass
elif opt.transaction:
	if len(opt.transaction) != 64 or not is_hex_str(opt.transaction):
		die(2,'{}: invalid transaction id'.format(opt.transaction))
elif opt.hashes:
	Msg('{:<7} {}'.format('BLOCK','HASH'))
else:
	if opt.miner_info:
		fs='{:<6} {:<19}{:>9} {:>6} {:>7} {:8} {}'
		Msg(fs.format('BLOCK','DATE','INTERVAL','CONFS','SIZE','VERSION','MINER'))
	else:
		fs='{:<6} {:<19}{:>9} {:>6} {:>7} {}'
		Msg(fs.format('BLOCK','DATE','INTERVAL','CONFS','SIZE','VERSION'))

miner_strings = {
	'Bixin':'Bixin',
	'AntPool':'AntPool',
	'Bitfury':'Bitfury',
	'BTCC':'BTCC',
	'BTC.COM':'BTC.COM',
	'BTPOOL':'BTPOOL',
	'ViaBTC':'ViaBTC',
	'slush':'Slush',
	'BitMinter':'BitMinter',
	'BW.COM':'BW.COM',
	'gbminers':'GBMiners',
	'BitClub Network':'BitClub Network',
	'bitcoin.com':'bitcoin.com',
	'KanoPool':'KanoPool',
	'BTC.TOP':'BTC.TOP',
}

total,prev_time = 0,None
for i in range(first,last+1):
	b = c.getblock(c.getblockhash(i))
	total += b['size']
	if opt.transaction:
		if opt.transaction in b['tx']:
			Msg('Requested transaction is in block {}'.format(i))
			sys.exit(0)
		msg('Checking block {}'.format(i))
	else:
		gmt = time.gmtime(b['mediantime'])
		date = '{}-{:02}-{:02} {:02}:{:02}:{:02}'.format(*gmt[:6])
		if prev_time == None:
			b_prev = b if i == 0 else c.getblock(c.getblockhash(i-1))
			first_time = prev_time = b_prev['mediantime']
		et = b['mediantime'] - prev_time
		prev_time = b['mediantime']
		if opt.summary:
			continue
		if opt.hashes:
			Msg('{:<7} {}'.format(i,b['hash']))
		else:
			d = (i,date,'{}:{:02}'.format(et//60,et%60),b['confirmations'],b['size'],b['versionHex'])
			if opt.miner_info:
				bd = c.getrawtransaction(b['tx'][0],1,on_fail='silent')
				if type(bd) == tuple:
					Msg(fs.format(*(d+('---',))))
				else:
					cb = unhexlify(bd['vin'][0]['coinbase'])
					scb = re.sub(b'[^\w /-:,;.]',b'',cb)[1:]
					if opt.raw_miner_info:
						Msg(fs.format(*(d+(scb.decode(),))))
					else:
						for ms in miner_strings:
							if ms.encode() in scb:
								s = miner_strings[ms]
								break
						else:
							try:    s = scb.split('ined by')[1].strip()
							except: s = '??'
						nya_str = (b'    ',b'NYA ')[b'NYA' in scb] if opt.nya else b''
						Msg(fs.format(*(d+(nya_str.decode()+s,))))
			else:
				Msg(fs.format(*d))

if opt.transaction:
	from mmgen.rpc import rpc_error
	if rpc_error(c.getmempoolentry(opt.transaction,on_fail='silent')):
		Msg('\rTransaction not found in block range {}-{} or in mempool'.format(first,last))
	else:
		Msg('\rTransaction is in mempool')
else:
	blocks = last - first + 1
	if blocks > 1:
		fs2 = '{:<15} {}\n'
		et = b['mediantime'] - first_time
		ac = int(et / blocks)
		if not opt.summary: Msg('')
		Msg_r(  fs2.format('Range:','{}-{} ({} blocks)'.format(first,last,blocks)) +
				fs2.format('Avg size:','{} bytes'.format(total//blocks)) +
				fs2.format('MB/hr:','{:0.5f}'.format(float(total)*36/10000/et)) +
				fs2.format('Avg conf time:','{}:{:02}'.format(ac//60,ac%60)))