feat: Add button to delete Northstar mod (#110)

* feat: Expose installed NS mod directory

This allows other functions to get a mod directory directly which is
useful for e.g. deleting a mod.

* feat: Add button to delete Northstar mod

* refactor: Return vector of NorthstarMod
instead of unnamed Tuples

* refactor: Remove leftover print statement

* chore: Remove leftover todo comment

* feat: Show confirm warning before deleting mod

* refactor: Call func directly instead of proxy

Removes the `func_caller` pattern

* fix: Call reloading mods after attempted delete

3 files changed, 82 insertions, 2 deletions

diff --git a/src-tauri/src/main.rs b/src-tauri/src/main.rs
index 0d7e69af..a9483e95 100644
--- a/src-tauri/src/main.rs
+++ b/src-tauri/src/main.rs
@@ -23,7 +23,7 @@ use repair_and_verify::{
 
 mod mod_management;
 use mod_management::{
-    fc_download_mod_and_install, get_installed_mods_and_properties, set_mod_enabled_status,
+    fc_download_mod_and_install, get_installed_mods_and_properties, set_mod_enabled_status, delete_northstar_mod,
 };
 
 mod northstar;
@@ -103,6 +103,7 @@ fn main() {
             install_mod_caller,
             clean_up_download_folder_caller,
             get_newest_flightcore_version,
+            delete_northstar_mod,
         ])
         .run(tauri::generate_context!())
         .expect("error while running tauri application");
diff --git a/src-tauri/src/mod_management/mod.rs b/src-tauri/src/mod_management/mod.rs
index 4fe1b517..f6897b90 100644
--- a/src-tauri/src/mod_management/mod.rs
+++ b/src-tauri/src/mod_management/mod.rs
@@ -10,6 +10,8 @@ use app::GameInstall;
 
 use json5;
 
+use crate::northstar::CORE_MODS;
+
 pub const BLACKLISTED_MODS: [&str; 3] = [
     "northstar-Northstar",
     "northstar-NorthstarReleaseCandidate",
@@ -385,3 +387,46 @@ pub async fn fc_download_mod_and_install(
 
     Ok(())
 }
+
+/// Deletes a given Northstar mod folder
+fn delete_mod_folder(ns_mod_directory: String) -> Result<(), String> {
+    let ns_mod_dir_path = std::path::Path::new(&ns_mod_directory);
+
+    // Safety check: Check whether `mod.json` exists and exit early if not
+    // If it does not exist, we might not be dealing with a Northstar mod
+    let mod_json_path = ns_mod_dir_path.join("mod.json");
+    if !mod_json_path.exists() {
+        // If it doesn't exist, return an error
+        return Err(format!("mod.json does not exist in {}", ns_mod_directory));
+    }
+
+    match std::fs::remove_dir_all(&ns_mod_directory) {
+        Ok(()) => Ok(()),
+        Err(err) => Err(format!("Failed deleting mod: {err}")),
+    }
+}
+
+/// Deletes a Northstar mod based on its name
+#[tauri::command]
+pub fn delete_northstar_mod(game_install: GameInstall, nsmod_name: String) -> Result<(), String> {
+    // Prevent deleting core mod
+    for core_mod in CORE_MODS {
+        if nsmod_name == core_mod {
+            return Err(format!("Cannot remove core mod {nsmod_name}"));
+        }
+    }
+
+    // Get installed mods
+    let installed_ns_mods = get_installed_mods_and_properties(game_install)?;
+
+    // Get folder name based on northstarmods
+    for installed_ns_mod in installed_ns_mods {
+        // Installed mod matches specified mod
+        if installed_ns_mod.name == nsmod_name {
+            // Delete folder
+            return delete_mod_folder(installed_ns_mod.directory);
+        }
+    }
+
+    Err(format!("Mod {nsmod_name} not found to be installed"))
+}
diff --git a/src-vue/src/views/ModsView.vue b/src-vue/src/views/ModsView.vue
index af3b58a3..2f352ded 100644
--- a/src-vue/src/views/ModsView.vue
+++ b/src-vue/src/views/ModsView.vue
@@ -7,7 +7,15 @@
                 <el-card v-else shadow="hover" v-for="mod in installedMods" v-bind:key="mod.name">
                     <el-switch style="--el-switch-on-color: #13ce66; --el-switch-off-color: #8957e5" v-model="mod.enabled"
                         :before-change="() => updateWhichModsEnabled(mod)" :loading="global_load_indicator" />
-                    {{mod.name}}
+                    <el-popconfirm
+                        title="Are you sure to delete this mod?"
+                        @confirm="deleteMod(mod)"
+                    >
+                        <template #reference>
+                            <el-button type="danger">Delete</el-button>
+                        </template>
+                    </el-popconfirm>
+                    {{ mod.name }}
                 </el-card>
             </div>
         </el-scrollbar>
@@ -69,6 +77,32 @@ export default defineComponent({
 
             this.global_load_indicator = false;
             return true;
+        },
+        async deleteMod(mod: NorthstarMod) {
+            let game_install = {
+                game_path: this.$store.state.game_path,
+                install_type: this.$store.state.install_type
+            } as GameInstall;
+            await invoke("delete_northstar_mod", { gameInstall: game_install, nsmodName: mod.name })
+                .then((message) => {
+                    // Just a visual indicator that it worked
+                    ElNotification({
+                        title: `Success deleting ${mod.name}`,
+                        type: 'success',
+                        position: 'bottom-right'
+                    });
+                })
+                .catch((error) => {
+                    ElNotification({
+                        title: 'Error',
+                        message: error,
+                        type: 'error',
+                        position: 'bottom-right'
+                    });
+                })
+                .finally(() => {
+                    this.$store.commit('loadInstalledMods');
+                });
         }
     }
 });