From a9d832b53940401cf3d5bffd07a55fbe22d5cd3b Mon Sep 17 00:00:00 2001
From: Tim Sarbin <tim.sarbin@gmail.com>
Date: Wed, 28 Oct 2020 21:42:03 -0400
Subject: [PATCH] Added useful config error panic. Added window title to panic
 window. (#879)

---
 d2core/d2config/d2config.go                   | 36 +++++++++++++++++++
 d2core/d2render/ebiten/ebiten_panic_screen.go |  1 +
 2 files changed, 37 insertions(+)

diff --git a/d2core/d2config/d2config.go b/d2core/d2config/d2config.go
index 8e78e2c2..67f2ad37 100644
--- a/d2core/d2config/d2config.go
+++ b/d2core/d2config/d2config.go
@@ -2,9 +2,11 @@ package d2config
 
 import (
 	"encoding/json"
+	"errors"
 	"log"
 	"os"
 	"path"
+	"strings"
 )
 
 // Config holds the configuration from config.json
@@ -58,6 +60,10 @@ func (c *Configuration) Load() error {
 			return err
 		}
 
+		if err := verifyMpqFileReferences(); err != nil {
+			return err
+		}
+
 		return nil
 	}
 
@@ -65,6 +71,10 @@ func (c *Configuration) Load() error {
 
 	Config = defaultConfig()
 
+	if err := verifyMpqFileReferences(); err != nil {
+		return err
+	}
+
 	return Config.Save()
 }
 
@@ -106,3 +116,29 @@ func defaultConfigPath() string {
 func localConfigPath() string {
 	return path.Join(path.Dir(os.Args[0]), "config.json")
 }
+
+func verifyMpqFileReferences() error {
+	badFiles := []string{}
+
+	for fileIdx := range Config.MpqLoadOrder {
+		actualPath := path.Join(Config.MpqPath, Config.MpqLoadOrder[fileIdx])
+		info, err := os.Stat(actualPath)
+
+		if !os.IsNotExist(err) {
+			continue
+		}
+
+		if info != nil && !info.IsDir() {
+			continue
+		}
+
+		badFiles = append(badFiles, actualPath)
+	}
+
+	if len(badFiles) > 0 {
+		return errors.New("The following MPQ file(s) could not be found:\n" + strings.Join(badFiles, "\n") +
+			"\n\nPlease check your configuration file located at:\n" + defaultConfigPath())
+	}
+
+	return nil
+}
diff --git a/d2core/d2render/ebiten/ebiten_panic_screen.go b/d2core/d2render/ebiten/ebiten_panic_screen.go
index 079b490e..467690ce 100644
--- a/d2core/d2render/ebiten/ebiten_panic_screen.go
+++ b/d2core/d2render/ebiten/ebiten_panic_screen.go
@@ -17,6 +17,7 @@ func CreatePanicScreen(errorMessage string) *PanicScreen {
 		errorMessage: errorMessage,
 	}
 
+	ebiten.SetWindowTitle("OpenDiablo 2 - PANIC SCREEN")
 	ebiten.SetWindowResizable(true)
 
 	return result