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
from copy import copy

class AnalyzerException(Exception):
  pass

def path_dist(m):
  t = 0
  o = Point(0,0)
  for w in m:
    t +=w.distance(o)
    o = w
  return t
  
@dataclass
class Point:
  x: int
  y: int
  
@dataclass
class TradeOption:
  resource: str
  source: Waypoint
  dest: Waypoint
  margin: int
  dist: int
  score: float
  
@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):
    wps = copy(waypoints)
    path = []
    cur = Point(0,0)
    while len(wps) > 0:
      closest = wps[0]
      for w in wps:
        if w.distance(cur) < closest.distance(cur):
          closest = w
      cur = closest
      path.append(closest)
      wps.remove(closest)
    return path
 
  def get_jumpgate(self, system):
    gates = self.store.all_members(system, Jumpgate)
    return next(gates, None)
  
  # dijkstra shmijkstra
  def find_nav_path(self, orig, to, ran):
    path = []
    mkts = [m.waypoint for m in self.store.all_members(orig.system, Marketplace)]
    cur = orig
    if orig == to:
      return []
    while cur != to:
      best = cur
      bestdist = cur.distance(to)
      if bestdist < ran:
        path.append(to)
        break
      for m in mkts:
        dist = m.distance(to)
        if dist < bestdist and cur.distance(m) < ran:
          best = m
          bestdist = dist
      if best == cur:
        raise AnalyzerException(f'no path to {to}') 
      cur = best
      path.append(cur)
    return path
    
  def find_jump_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==to]
    if len(result) > 0:
      return result[0].path()
    dest = set()
    for o in orig:
      jg = self.get_jumpgate(o)
      if jg is None: continue
      for s in jg.connections:
        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)
  
  def prices(self, system):
    prices = {}
    for m in self.store.all_members(system, Marketplace):
      for p in m.prices.values():
        r = p['symbol']
        if not r in prices:
          prices[r] = []
        prices[r].append({
          'wp': m.waypoint,
          'buy': p['buy'],
          'sell': p['sell']
        })
    return prices
  
  def find_trade(self, system):
    prices = self.prices(system)
    occupied_resources = set()
    for s in self.store.all('Ship'):
      if s.mission != 'haul':
        continue
      occupied_resources.add(s.mission_state['resource'])
    best = None
    for resource, markets in prices.items():
      if resource in occupied_resources:
        continue
      source = sorted(markets, key=lambda x: x['buy'])[0]
      dest = sorted(markets, key=lambda x: x['sell'])[-1]
      margin = dest['sell'] -source['buy']
      
      dist = source['wp'].distance(dest['wp'])
      dist = max(dist, 0.0001)
      score = margin / dist
      if margin < 0:
        continue
      o = TradeOption(resource, source['wp'], dest['wp'], margin, dist, score)
      if best is None or best.score < o.score:
        best = o
    return best