from nullptr.store import Store
from nullptr.models.base import Base
from nullptr.models.waypoint import Waypoint
from nullptr.models.contract import Contract
from nullptr.models.survey import Survey
from nullptr.models.ship import Ship
from time import time
import logging
from nullptr.util import *

class MissionError(Exception):
  pass
  
class MissionParam:
  def __init__(self, cls, required=True, default=None):
    self.cls = cls
    self.required = required
    self.default = default
  
  def parse(self, val, store):
    if self.cls == str:
      return str(val)
    elif self.cls == int:
      return int(val)
    elif issubclass(self.cls, Base):
      data = store.get(self.cls, val)
      if data is None:
        raise ValueError('object not found')
      return data.symbol
    else:
      raise ValueError('unknown param typr')
    
class Mission:
  @classmethod
  def params(cls):
    return {
      
    }
  
  def __init__(self, ship, store, api):
    self.ship = ship
    self.store = store
    self.api = api
    self.next_step = 0

  def sts(self, nm, v):
    if issubclass(type(v), Base):
      v = v.symbol
    self.ship.set_mission_state(nm, v)
  
  def rst(self, typ, nm):
    symbol = self.st(nm)
    return self.store.get(typ, symbol)
    
  def st(self, nm):
    if not nm in self.ship.mission_state:
      return None
    return self.ship.mission_state[nm]
  
  def status(self, nw=None):
    if nw is None:
      return self.ship.mission_status
    else:
      self.ship.mission_status = nw
      
  def start_state(self):
    return 'done'
  
  def error(self, msg):
    self.status('error')
    print(msg)

  def init_state(self):
    for name, param in self.params().items():
      if param.required and param.default is None:
        if not name in self.ship.mission_state:
          return self.error(f'Param {name} not set')
    self.status(self.start_state())
  
  def steps(self):
    return {
      
    }
  
  def step_done(self):
    logging.info(f'mission finished for {self.ship}')
    
  def is_waiting(self):
    return self.next_step > time()
  
  def is_finished(self):
    return self.status() in ['done','error']
  
  def is_ready(self):
    return not self.is_waiting() and not self.is_finished()
  
  def step(self):
    steps = self.steps()
    if self.status() == 'init':
      self.init_state()
    status = self.status()
    if not status in steps:
      logging.warning(f"Invalid mission status {status}")
      self.status('error')
      return
    handler, next_step = steps[status]
    try:
      result = handler()
    except Exception as e:
      logging.error(e, exc_info=True)
      self.status('error')
      return
    if type(next_step) == str:
      self.status(next_step)
    elif type(next_step) == dict:
      if result not in next_step:
        logging.warning(f'Invalid step result {result}')
        self.status('error')
        return
      else:
        self.status(next_step[result])
    print(f'{self.ship} {status} -> {self.status()}')


class MiningMission(Mission): 
  @classmethod
  def params(cls):
    return {
      'site': MissionParam(Waypoint, True),
      'resource': MissionParam(str, True),
      'destination': MissionParam(Waypoint, True),
      'delivery': MissionParam(str, True, 'deliver'),
      'contract': MissionParam(Contract, False)
    }
  
  def start_state(self):
    return 'go_site'
    
  def steps(self):
    return {
      'extract': (self.step_extract, {
        'done': 'dock',
        'more': 'extract'
      }),
      'dock': (self.step_dock, 'sell'),
      'sell': (self.step_sell, {
        'more': 'sell',
        'done': 'orbit',
      }),
      'orbit': (self.step_orbit, 'jettison'),
      'jettison': (self.step_dispose, {
        'more': 'jettison',
        'done': 'extract',
        'full': 'go_dest'
      }),
      'go_dest': (self.step_go_dest, 'dock_dest'),
      'dock_dest': (self.step_dock, 'unload'),
      'unload': (self.step_unload, {
        'done': 'refuel',
        'more': 'unload'
      }),
      'refuel': (self.step_refuel, 'orbit_dest'),
      'orbit_dest': (self.step_orbit, 'go_site'),
      'go_site': (self.step_go_site, 'extract')
    }
  
  def get_survey(self):
    resource = self.st('resource')
    site = self.rst(Waypoint,'site')
    # todo optimize
    for s in self.store.all(Survey):
      if resource in s.deposits and site.symbol == s.waypoint():
        return s
    return None
    
  def step_extract(self):
    survey = self.get_survey()
    print('using survey:', str(survey)) 
    result = self.api.extract(self.ship, survey)
    symbol = sg(result,'extraction.yield.symbol')
    units  = sg(result,'extraction.yield.units')
    print('extracted:', units, symbol)
    self.next_step = self.ship.cooldown
    if self.ship.cargo_units < self.ship.cargo_capacity:
      return 'more'
    else:
      return 'done'
    
  def step_sell(self, except_resource=True):
    target = self.st('resource')
    market = self.store.get('Marketplace', self.ship.location_str)
    sellables = market.sellable_items(self.ship.cargo.keys())
    if target in sellables and except_resource:
      sellables.remove(target)
    if len(sellables) == 0:
      return 'done'
    self.api.sell(self.ship, sellables[0])
    if len(sellables) == 1:
      return 'done'
    else:
      return 'more'
      
  def step_go_dest(self):
    destination = self.rst(Waypoint, 'destination')
    if self.ship.location() == destination:
      return
    self.api.navigate(self.ship, destination)
    self.next_step = self.ship.arrival

  def step_dock(self):
    self.api.dock(self.ship)

  def step_unload(self):
    contract = self.rst(Contract, 'contract')
    delivery = self.st('delivery')
    if delivery == 'sell':
      return self.step_sell(False)
    typs = self.ship.deliverable_cargo(contract)
    if len(typs) == 0:
      return 'done'
    self.api.deliver(self.ship, typs[0], contract)
    if len(typs) == 1:
      return 'done'
    else:
      return 'more'
  
  def step_refuel(self):
    self.api.refuel(self.ship)
    
  def step_dispose(self):
    contract = self.rst(Contract, 'contract')
    typs = self.ship.nondeliverable_cargo(contract)
    if len(typs) > 0:
      self.api.jettison(self.ship, typs[0])
    if len(typs) > 1:
      return 'more'
    elif self.ship.cargo_units > self.ship.cargo_capacity - 3:
      return 'full'
    else:
      return 'done'
  
  
  def step_orbit(self):
    self.api.orbit(self.ship)

  def step_go_site(self):
    site = self.rst(Waypoint,'site')
    if self.ship.location() == site:
      return
    self.api.navigate(self.ship, site)
    self.next_step = self.ship.arrival
    
class SurveyMission(Mission):
  def start_state(self):
    return 'survey'
  
    
  def steps(self):
    return {
      'survey': (self.step_survey, 'survey')
    }
  
  def step_survey(self):
    result = self.api.survey(self.ship)
    #pprint(result, 2)
    self.next_step = self.ship.cooldown

def create_mission(mtype, ship, store, api):
  types = {
    'survey': SurveyMission,
    'mine': MiningMission
  }
  if mtype not in types:
    logging.warning(f'invalid mission type {mtype}')
    return
  m = types[mtype](ship, store, api)
  return m