Unciv/core/src/com/unciv/GameStarter.kt

package com.unciv

import com.badlogic.gdx.math.Vector2
import com.unciv.logic.GameInfo
import com.unciv.logic.civilization.CivilizationInfo
import com.unciv.logic.map.TileMap
import com.unciv.models.gamebasics.GameBasics
import com.unciv.ui.NewGameScreen
import com.unciv.ui.utils.getRandom

class GameStarter(){
    fun startNewGame(newGameParameters: NewGameScreen.NewGameParameters): GameInfo {
        val gameInfo = GameInfo()

        gameInfo.tileMap = TileMap(newGameParameters.mapRadius, newGameParameters.mapType)
        gameInfo.tileMap.gameInfo = gameInfo // need to set this transient before placing units in the map


        fun vectorIsWithinNTilesOfEdge(vector: Vector2,n:Int): Boolean {
            return vector.x < newGameParameters.mapRadius-n
            && vector.x > n-newGameParameters.mapRadius
            && vector.y < newGameParameters.mapRadius-n
            && vector.y > n-newGameParameters.mapRadius
        }

        val distanceAroundStartingPointNoOneElseWillStartIn = 5
        val freeTiles = gameInfo.tileMap.values
                .filter { it.isLand() && vectorIsWithinNTilesOfEdge(it.position,3)}
                .toMutableList()
        val playerPosition = freeTiles.getRandom().position
        val playerCiv = CivilizationInfo(newGameParameters.nation)
        playerCiv.difficulty=newGameParameters.difficulty
        gameInfo.civilizations.add(playerCiv) // first one is player civ

        freeTiles.removeAll(gameInfo.tileMap.getTilesInDistance(playerPosition, distanceAroundStartingPointNoOneElseWillStartIn ))

        val barbarianCivilization = CivilizationInfo()
        gameInfo.civilizations.add(barbarianCivilization)// second is barbarian civ

        for (nationName in GameBasics.Nations.keys.filterNot { it=="Barbarians" || it==newGameParameters.nation }.shuffled()
                .take(newGameParameters.numberOfEnemies)) {
            val civ = CivilizationInfo(nationName)
            civ.tech.techsResearched.addAll(playerCiv.getDifficulty().aiFreeTechs)
            gameInfo.civilizations.add(civ)
        }


        barbarianCivilization.civName = "Barbarians"

        gameInfo.setTransients() // needs to be before placeBarbarianUnit because it depends on the tilemap having its gameinfo set

        // and only now do we add units for everyone, because otherwise both the gameInfo.setTransients() and the placeUnit will both add the unit to the civ's unit list!

        for (civ in gameInfo.civilizations.toList().filter { !it.isBarbarianCivilization() }) {
            if(freeTiles.isEmpty()){
                gameInfo.civilizations.remove(civ)
                continue
            } // we can't add any more civs.
            val startingLocation = freeTiles.toList().getRandom().position

            civ.placeUnitNearTile(startingLocation, "Settler")
            civ.placeUnitNearTile(startingLocation, "Warrior")
            civ.placeUnitNearTile(startingLocation, "Scout")

            freeTiles.removeAll(gameInfo.tileMap.getTilesInDistance(startingLocation, distanceAroundStartingPointNoOneElseWillStartIn ))
        }

        return gameInfo
    }
}