Co-op campaign "League against the Lightwatch": 20 missions, selectable on the Match page

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/menu.rs

@@ -421,7 +421,9 @@ pub struct Menu {
     pub error: Option<String>,   // message on the login and account pages
     pub match_ui: MatchUi,       // copied state of the multiplayer relay, shown on the Match page
     pub coop_mission: usize,     // co-op campaign mission selected on the Match page
-    pub coop_editor: bool,       // the Match page offers the editor campaign instead of the built-in one
+    pub coop_editor: bool,       // the Match page offers a campaign document instead of the built-in missions
+    pub coop_league: bool,       // ... and that document is the co-op campaign "League against the Lightwatch"
+    league_doc: Option<CampaignDoc>, // the co-op campaign, built the first time it is chosen
     pub coop_editor_mission: usize, // mission of `campaign_doc` selected for co-op
     pub in_match: bool,          // a match is being played; the pause menu changes its shape
     pub gold_allies: Vec<u8>,    // allies of the local master that can get gold (pause menu)
@@ -463,6 +465,8 @@ impl Menu {
             match_ui: MatchUi::default(),
             coop_mission: crate::campaign::coop_mission_indexes().first().copied().unwrap_or(0),
             coop_editor: false,
+            coop_league: false,
+            league_doc: None,
             coop_editor_mission: 0,
             in_match: false,
             gold_allies: Vec::new(),
@@ -764,7 +768,7 @@ impl Menu {
             Some(b @ (Btn::MatchCoopPrev | Btn::MatchCoopNext)) => {
                 let dir = if b == Btn::MatchCoopPrev { -1 } else { 1 };
                 if self.coop_editor {
-                    self.coop_editor_mission = crate::campaign::next_editor_coop_mission(&self.campaign_doc, self.coop_editor_mission, dir);
+                    self.coop_editor_mission = crate::campaign::next_editor_coop_mission(self.coop_doc(), self.coop_editor_mission, dir);
                 } else {
                     self.coop_mission = crate::campaign::next_coop_mission(self.coop_mission, dir);
                 }
@@ -772,8 +776,25 @@ impl Menu {
                 MenuAction::Consumed
             }
             Some(Btn::MatchCoopSource) => {
-                self.coop_editor = !self.coop_editor && !self.campaign_doc.missions.is_empty();
-                self.coop_editor_mission = crate::campaign::next_editor_coop_mission(&self.campaign_doc, self.coop_editor_mission, 0);
+                // built-in missions -> the league -> the editor's campaign (if it has missions) -> ...
+                match (self.coop_editor, self.coop_league) {
+                    (false, _) => {
+                        if self.league_doc.is_none() {
+                            self.league_doc = Some(crate::editor::coop_campaign::coop_campaign());
+                        }
+                        self.coop_editor = true;
+                        self.coop_league = true;
+                    }
+                    (true, true) if !self.campaign_doc.missions.is_empty() => self.coop_league = false,
+                    _ => {
+                        self.coop_editor = false;
+                        self.coop_league = false;
+                    }
+                }
+                self.coop_editor_mission = 0;
+                if self.coop_editor {
+                    self.coop_editor_mission = crate::campaign::next_editor_coop_mission(self.coop_doc(), 0, 0);
+                }
                 self.confirm = None;
                 MenuAction::Consumed
             }
@@ -1717,6 +1738,14 @@ impl Menu {
         self.column(gfx, x + (cols as f32 * CW() - w) * 0.5, y + (rows - 4) as f32 * CH(), w, &[(Btn::Resume, label)]);
     }
 
+    // the campaign document the co-op create offers: the league or the editor's campaign
+    pub fn coop_doc(&self) -> &CampaignDoc {
+        match (&self.league_doc, self.coop_league) {
+            (Some(d), true) => d,
+            _ => &self.campaign_doc,
+        }
+    }
+
     pub fn scrollable(&self) -> bool {
         matches!(
             self.page,
@@ -1920,15 +1949,16 @@ impl Menu {
         }
 
         // the editor campaign can only be offered while it has missions (it may have been replaced)
-        let editor_coop = self.coop_editor && !self.campaign_doc.missions.is_empty();
-        let editor_list = if editor_coop { crate::campaign::editor_coop_indexes(&self.campaign_doc) } else { Vec::new() };
+        let doc = self.coop_doc().clone();
+        let editor_coop = self.coop_editor && !doc.missions.is_empty();
+        let editor_list = if editor_coop { crate::campaign::editor_coop_indexes(&doc) } else { Vec::new() };
         if editor_coop && !editor_list.contains(&self.coop_editor_mission) {
             self.coop_editor_mission = editor_list.first().copied().unwrap_or(0);
         }
         if !ui.started && !ui.room_open() && editor_coop {
-            let line = match self.campaign_doc.missions.get(self.coop_editor_mission).filter(|_| !editor_list.is_empty()) {
+            let line = match doc.missions.get(self.coop_editor_mission).filter(|_| !editor_list.is_empty()) {
                 Some(m) => {
-                    let name = if self.campaign_doc.name.trim().is_empty() { "?".to_string() } else { self.campaign_doc.name.clone() };
+                    let name = if doc.name.trim().is_empty() { "?".to_string() } else { doc.name.clone() };
                     let title = if m.title.trim().is_empty() { m.key.clone() } else { m.title.clone() };
                     trf("net.coop_editor_mission", &[name, (self.coop_editor_mission + 1).to_string(), title])
                 }
@@ -1963,9 +1993,13 @@ impl Menu {
                     items.push((Btn::MatchCoopCreate, tr("net.coop_create")));
                     items.push((Btn::MatchCoopNext, ">".to_string()));
                 }
-                if !self.campaign_doc.missions.is_empty() {
-                    items.push((Btn::MatchCoopSource, tr(if editor_coop { "net.coop_builtin" } else { "net.coop_editor" })));
-                }
+                // the button names what comes next
+                let next = match (editor_coop, self.coop_league) {
+                    (false, _) => "net.coop_league",
+                    (true, true) if !self.campaign_doc.missions.is_empty() => "net.coop_editor",
+                    _ => "net.coop_builtin",
+                };
+                items.push((Btn::MatchCoopSource, tr(next)));
             }
             if ui.room_open() {
                 items.push((Btn::MatchReady, tr(if ui.ready { "net.unready" } else { "net.ready" })));