module Planet
    (makePlanets,
     generatePlanetInfo)
    where

import PlanetData
import DB
import Plane
import TerrainData
import Control.Monad
import Data.Maybe
import Data.Ord
import Town
import Data.List
import Data.ByteString.Char8 as B
import FactionData
import BuildingData

makePlanet :: (PlaneLocation l) => l -> PlanetInfo -> DB PlaneRef
makePlanet plane_location planet_info =
    do seed <- getRandom
       seed_down <- getRandom
       planet_name <- liftM (`fromMaybe` planet_info_name planet_info) $
                          randomPlanetName PanGalacticTreatyOrganization
       plane_ref <- dbNewPlane
          planet_name
          (TerrainGenerationData {
               tg_smootheness = 3,
               tg_biome = planet_info_biome planet_info,
               tg_placements = [recreantFactories seed,
                                stairsDown seed_down 0] })
          plane_location
       town <- liftM catMaybes $ forM (planet_info_town planet_info) $ \(r,b) ->
           do p <- rationalRoll r
              return $ if p then Just b else Nothing
       _ <- createTown plane_ref town
       _ <- makeDungeons planet_name (Beneath plane_ref) 1 planet_info
       return plane_ref

makePlanets :: (PlaneLocation l) => l -> [PlanetInfo]  -> DB PlaneRef
makePlanets _ [] = return $ error "makePlanetarySystem: empty list"
makePlanets l (planet_info:rest) =
    do plane_ref <- makePlanet l planet_info
       _ <- makePlanets (Subsequent plane_ref) rest
       return plane_ref

makeDungeons :: (PlaneLocation l) =>
                B.ByteString ->
                l ->
                Integer ->
                PlanetInfo ->
                DB PlaneRef
makeDungeons planet_name plane_location i planet_info =
    do let n = planet_info_depth planet_info
       seed_up <- getRandom
       seed_down <- getRandom
       plane_ref <- dbNewPlane
           planet_name
           (TerrainGenerationData {
               tg_smootheness = 2,
               tg_biome = planet_info_dungeon planet_info,
               tg_placements =
                   [stairsUp seed_up i] ++
                   if i < n then [stairsDown seed_down i] else [] })
           plane_location
       when (i == n) $
           do _ <- createTown plane_ref [Node $ planet_info_node_type planet_info]
              return ()
       when (i < n) $
           do _ <- makeDungeons planet_name (Beneath plane_ref) (succ i) planet_info
              return ()
       return plane_ref

generatePlanetInfo :: (DBReadable db) => [PlanetInfo] -> db [PlanetInfo]
generatePlanetInfo planet_infos = liftM (sortBy (comparing planet_info_priority)) $ forM planet_infos $ \planet_info ->
    do -- see documentation for 'PlanetData.PlanetInfo'
       prio_bonus <- getRandomR (0.0,1.0)
       return $ planet_info { planet_info_priority =
           planet_info_priority planet_info + prio_bonus }