import cPickle

import base64
from collections import defaultdict
import json
import os
from os.path import join
import re
import StringIO
import time
import gzip

from config import config
import companion
import outfitting

# Map API ship names to E:D Shipyard ship names
ship_map = dict(companion.ship_map)
ship_map['cobramkiii'] = 'Cobra Mk III'
ship_map['cobramkiv']  = 'Cobra Mk IV',
ship_map['viper']      = 'Viper'
ship_map['viper_mkiv'] = 'Viper Mk IV'


# Map API slot names to E:D Shipyard slot names
slot_map = {
    'hugehardpoint'    : 'H',
    'largehardpoint'   : 'L',
    'mediumhardpoint'  : 'M',
    'smallhardpoint'   : 'S',
    'tinyhardpoint'    : 'U',
    'armour'           : 'BH',
    'powerplant'       : 'RB',
    'mainengines'      : 'TM',
    'frameshiftdrive'  : 'FH',
    'lifesupport'      : 'EC',
    'powerdistributor' : 'PC',
    'radar'            : 'SS',
    'fueltank'         : 'FS',
    'military'         : 'MC',
}


# Ship masses
ships = cPickle.load(open(join(config.respath, 'ships.p'),  'rb'))


# Export ship loadout in E:D Shipyard plain text format
def export(data, filename=None):

    def class_rating(module):
        if 'guidance' in module:	# Missiles
            return module['class'] + module['rating'] + '/' + module.get('mount', 'F')[0] + module['guidance'][0] + ' '
        elif 'mount' in module:		# Hardpoints
            return module['class'] + module['rating'] + '/' + module['mount'][0] + ' '
        elif 'Cabin' in module['name']:	# Passenger cabins
            return module['class'] + module['rating'] + '/' + module['name'][0] + ' '
        else:
            return module['class'] + module['rating'] + ' '

    querytime = config.getint('querytime') or int(time.time())

    loadout = defaultdict(list)
    mass = 0.0
    fuel = 0
    cargo = 0
    fsd = None

    for slot in sorted(data['ship']['modules']):

        v = data['ship']['modules'][slot]
        try:
            if not v: continue

            module = outfitting.lookup(v['module'], ship_map)
            if not module: continue

            cr = class_rating(module)
            mods = v.get('modifications') or v.get('WorkInProgress_modifications') or {}
            if mods.get('OutfittingFieldType_Mass'):
                mass += (module.get('mass', 0) * mods['OutfittingFieldType_Mass']['value'])
            else:
                mass += module.get('mass', 0)

            # Specials
            if 'Fuel Tank'in module['name']:
                fuel += 2**int(module['class'])
                name = '%s (Capacity: %d)' % (module['name'], 2**int(module['class']))
            elif 'Cargo Rack' in module['name']:
                cargo += 2**int(module['class'])
                name = '%s (Capacity: %d)' % (module['name'], 2**int(module['class']))
            else:
                name = module['name']

            if name == 'Frame Shift Drive':
                fsd = module	# save for range calculation
                if mods.get('OutfittingFieldType_FSDOptimalMass'):
                    fsd['optmass'] *= mods['OutfittingFieldType_FSDOptimalMass']['value']
                if mods.get('OutfittingFieldType_MaxFuelPerJump'):
                    fsd['maxfuel'] *= mods['OutfittingFieldType_MaxFuelPerJump']['value']


            for s in slot_map:
                if slot.lower().startswith(s):
                    loadout[slot_map[s]].append(cr + name)
                    break
            else:
                if slot.lower().startswith('slot'):
                    loadout[slot[-1]].append(cr + name)
                elif __debug__ and not slot.lower().startswith('planetaryapproachsuite'):
                    print 'EDShipyard: Unknown slot %s' % slot

        except AssertionError as e:
            if __debug__: print 'EDShipyard: %s' % e
            continue	# Silently skip unrecognized modules
        except:
            if __debug__: raise

    # Construct description
    string = '[%s]\n' % ship_map.get(data['ship']['name'].lower(), data['ship']['name'])
    for slot in ['H', 'L', 'M', 'S', 'U', None, 'BH', 'RB', 'TM', 'FH', 'EC', 'PC', 'SS', 'FS', None, 'MC', None, '9', '8', '7', '6', '5', '4', '3', '2', '1']:
        if not slot:
            string += '\n'
        elif slot in loadout:
            for name in loadout[slot]:
                string += '%s: %s\n' % (slot, name)
    string += '---\nCargo : %d T\nFuel  : %d T\n' % (cargo, fuel)

    # Add mass and range
    assert data['ship']['name'].lower() in companion.ship_map, data['ship']['name']
    assert companion.ship_map[data['ship']['name'].lower()] in ships, companion.ship_map[data['ship']['name'].lower()]
    try:
        # https://github.com/cmmcleod/coriolis/blob/master/app/js/shipyard/module-shipyard.js#L184
        mass += ships[companion.ship_map[data['ship']['name'].lower()]]['hullMass']
        string += 'Mass  : %.1f T empty\n        %.1f T full\n' % (mass, mass + fuel + cargo)
        multiplier = pow(min(fuel, fsd['maxfuel']) / fsd['fuelmul'], 1.0 / fsd['fuelpower']) * fsd['optmass']
        string += 'Range : %.2f LY unladen\n        %.2f LY laden\n' % (
            multiplier / (mass + fuel),
            multiplier / (mass + fuel + cargo))
    except:
        if __debug__: raise

    if filename:
        with open(filename, 'wt') as h:
            h.write(string)
        return

    # Look for last ship of this type
    ship = companion.ship_map.get(data['ship']['name'].lower(), data['ship']['name'])	# Use in-game name
    regexp = re.compile(re.escape(ship) + '\.\d\d\d\d\-\d\d\-\d\dT\d\d\.\d\d\.\d\d\.txt')
    oldfiles = sorted([x for x in os.listdir(config.get('outdir')) if regexp.match(x)])
    if oldfiles:
        with open(join(config.get('outdir'), oldfiles[-1]), 'rU') as h:
            if h.read() == string:
                return	# same as last time - don't write

    # Write
    filename = join(config.get('outdir'), '%s.%s.txt' % (ship, time.strftime('%Y-%m-%dT%H.%M.%S', time.localtime(querytime))))
    with open(filename, 'wt') as h:
        h.write(string)


# Return a URL for the current ship
def url(data, is_beta):

    string = json.dumps(companion.ship(data), ensure_ascii=False, sort_keys=True, separators=(',', ':')).encode('utf-8')	# most compact representation

    out = StringIO.StringIO()
    with gzip.GzipFile(fileobj=out, mode='w') as f:
        f.write(string)
    return (is_beta and 'http://www.edshipyard.com/beta/#/I=' or 'http://www.edshipyard.com/#/I=') + base64.urlsafe_b64encode(out.getvalue()).replace('=', '%3D')