from nullptr.models.marketplace import Marketplace
from nullptr.models.jumpgate import Jumpgate
from nullptr.models.system import System
from nullptr.models.waypoint import Waypoint
from dataclasses import dataclass

@dataclass
class SearchNode:
  system: System
  parent: 'SearchNode'

  def __hash__(self):
    return hash(self.system.symbol)
    
  def path(self):
    result = []
    n = self
    while n is not None:
      result.append(n.system)
      n = n.parent
    result.reverse()
    return result
    
  def __repr__(self):
    return self.system.symbol
 
class Analyzer:
  def __init__(self, store):
    self.store = store

  def find_markets(self, resource, sellbuy):
    for m in self.store.all(Marketplace):
      if 'sell' in sellbuy and resource in m.imports:
        yield ('sell', m)
      
      elif 'buy' in sellbuy and resource in m.exports:
        yield ('buy', m)
      
      elif 'exchange' in sellbuy and resource in m.exchange:
        yield ('exchange', m)
        
  def find_closest_markets(self, resource, sellbuy, location):
    if type(location) == str:
      location = self.store.get(Waypoint, location)
    mkts = self.find_markets(resource, sellbuy)
    candidates = []
    origin = location.system
    for typ, m in mkts:
      system = m.waypoint.system
      d = origin.distance(system)
      candidates.append((typ, m, d))
    possibles = sorted(candidates, key=lambda m: m[2])
    possibles = possibles[:10]
    results = []
    for typ,m,d in possibles:
      system = m.waypoint.system
      p = self.find_path(origin, system)
      if p is None: continue
      results.append((typ,m,d,len(p)))
    return results
    
  def solve_tsp(self, waypoints):
    # todo actually try to solve it
    return waypoints
 
  def get_jumpgate(self, system):
    gates = self.store.all_members(system, Jumpgate)
    return next(gates, None)
   
  def find_path(self, orig, to, depth=100, seen=None):
    if depth < 1: return None
    if seen is None:
      seen = set()
    if type(orig) == System:
      orig = set([SearchNode(orig,None)])
    result = [n for n in orig if n.system==to]
    if len(result) > 0:
      return result[0].path()
    dest = set()
    for o in orig:
      jg = self.get_jumpgate(o.system)
      if jg is None: continue
      for s in jg.systems:
        if s in seen:  continue
        seen.add(s)
        dest.add(SearchNode(s, o))
    if len(dest) == 0: 
      return None
    return self.find_path(dest, to, depth-1, seen)