From a2939c0e27341ec6370acb0c5f834d3a3d57b733 Mon Sep 17 00:00:00 2001
From: SomeTroglodyte <63000004+SomeTroglodyte@users.noreply.github.com>
Date: Mon, 10 May 2021 05:50:49 +0200
Subject: [PATCH] Accelerate Load Game Screen Info (#3902)

---
 core/src/com/unciv/logic/GameInfo.kt          | 14 ++++++++++--
 core/src/com/unciv/logic/GameSaver.kt         |  8 ++++---
 .../logic/civilization/CivilizationInfo.kt    | 10 ++++++++-
 core/src/com/unciv/ui/saves/LoadGameScreen.kt | 22 ++++++++++---------
 4 files changed, 38 insertions(+), 16 deletions(-)

diff --git a/core/src/com/unciv/logic/GameInfo.kt b/core/src/com/unciv/logic/GameInfo.kt
index 8bc25bf99d..7ea6878827 100644
--- a/core/src/com/unciv/logic/GameInfo.kt
+++ b/core/src/com/unciv/logic/GameInfo.kt
@@ -1,6 +1,5 @@
 package com.unciv.logic
 
-import com.badlogic.gdx.graphics.Color
 import com.unciv.Constants
 import com.unciv.UncivGame
 import com.unciv.logic.automation.NextTurnAutomation
@@ -392,4 +391,15 @@ class GameInfo {
             cityConstructions.inProgressConstructions.remove(oldBuildingName)
         }
     }
-}
\ No newline at end of file
+}
+
+// reduced variant only for load preview
+class GameInfoPreview {
+    var civilizations = mutableListOf<CivilizationInfoPreview>()
+    var difficulty = "Chieftain"
+    var gameParameters = GameParameters()
+    var turns = 0
+    var gameId = ""
+    var currentPlayer = ""
+    fun getCivilization(civName: String) = civilizations.first { it.civName == civName }
+}
diff --git a/core/src/com/unciv/logic/GameSaver.kt b/core/src/com/unciv/logic/GameSaver.kt
index 62ac113568..be41fee635 100644
--- a/core/src/com/unciv/logic/GameSaver.kt
+++ b/core/src/com/unciv/logic/GameSaver.kt
@@ -4,9 +4,7 @@ import com.badlogic.gdx.Gdx
 import com.badlogic.gdx.files.FileHandle
 import com.badlogic.gdx.utils.Json
 import com.unciv.UncivGame
-import com.unciv.logic.civilization.CivilizationInfo
 import com.unciv.models.metadata.GameSettings
-import com.unciv.ui.utils.ImageGetter
 import java.io.File
 import kotlin.concurrent.thread
 
@@ -68,6 +66,10 @@ object GameSaver {
         return game
     }
 
+    fun loadGamePreviewFromFile(gameFile: FileHandle): GameInfoPreview {
+        return json().fromJson(GameInfoPreview::class.java, gameFile)
+    }
+
     fun loadGameFromCustomLocation(loadCompletionCallback: (GameInfo?, Exception?) -> Unit) {
         customSaveLocationHelper!!.loadGame { game, e ->
             loadCompletionCallback(game?.apply { setTransients() }, e)
@@ -172,4 +174,4 @@ object GameSaver {
     fun getGameIdFromFile(gameFile: FileHandle): String {
         return json().fromJson(GameInfo::class.java, gameFile).gameId
     }
-}
\ No newline at end of file
+}
diff --git a/core/src/com/unciv/logic/civilization/CivilizationInfo.kt b/core/src/com/unciv/logic/civilization/CivilizationInfo.kt
index adff396851..f38a94db5c 100644
--- a/core/src/com/unciv/logic/civilization/CivilizationInfo.kt
+++ b/core/src/com/unciv/logic/civilization/CivilizationInfo.kt
@@ -680,4 +680,12 @@ class CivilizationInfo {
     }
 
     //endregion
-}
\ No newline at end of file
+}
+
+// reduced variant only for load preview
+class CivilizationInfoPreview {
+    var civName = ""
+    var playerType = PlayerType.AI
+    var playerId = ""
+    fun isPlayerCivilization() = playerType == PlayerType.Human
+}
diff --git a/core/src/com/unciv/ui/saves/LoadGameScreen.kt b/core/src/com/unciv/ui/saves/LoadGameScreen.kt
index 6c9504e1f0..7465adb7e4 100644
--- a/core/src/com/unciv/ui/saves/LoadGameScreen.kt
+++ b/core/src/com/unciv/ui/saves/LoadGameScreen.kt
@@ -171,29 +171,31 @@ class LoadGameScreen(previousScreen:CameraStageBaseScreen) : PickerScreen(disabl
     private fun onSaveSelected(save: FileHandle) {
         selectedSave = save.name()
         copySavedGameToClipboardButton.enable()
-        var textToSet = save.name()
+
+        rightSideButton.setText("Load [${save.name()}]".tr())
+        rightSideButton.enable()
+        deleteSaveButton.enable()
+        deleteSaveButton.color = Color.RED
+        descriptionLabel.setText("Loading...".tr())
+
 
         val savedAt = Date(save.lastModified())
-        descriptionLabel.setText("Loading...".tr())
-        textToSet += "\n{Saved at}: ".tr() + SimpleDateFormat("yyyy-MM-dd HH:mm", Locale.US).format(savedAt)
+        var textToSet = save.name() +
+             "\n${"Saved at".tr()}: " + SimpleDateFormat("yyyy-MM-dd HH:mm", Locale.US).format(savedAt)
         thread { // Even loading the game to get its metadata can take a long time on older phones
             try {
-                val game = GameSaver.loadGameFromFile(save)
+                val game = GameSaver.loadGamePreviewFromFile(save)
                 val playerCivNames = game.civilizations.filter { it.isPlayerCivilization() }.joinToString { it.civName.tr() }
                 textToSet += "\n" + playerCivNames +
                         ", " + game.difficulty.tr() + ", ${Fonts.turn}" + game.turns
                 if (game.gameParameters.mods.isNotEmpty())
-                    textToSet += "\n {Mods:} ".tr() + game.gameParameters.mods.joinToString()
+                    textToSet += "\n${"Mods:".tr()} " + game.gameParameters.mods.joinToString()
             } catch (ex: Exception) {
-                textToSet += "\n{Could not load game}!".tr()
+                textToSet += "\n${"Could not load game".tr()}!"
             }
 
             Gdx.app.postRunnable {
                 descriptionLabel.setText(textToSet)
-                rightSideButton.setText("Load [${save.name()}]".tr())
-                rightSideButton.enable()
-                deleteSaveButton.enable()
-                deleteSaveButton.color = Color.RED
             }
         }
     }