/* Add buttons */
(function(exports) {

  if (location != 'chrome://messenger/content/messenger.xhtml') return;

  const {FolderUtils} = ChromeUtils.importESModule("resource:///modules/FolderUtils.sys.mjs");

  exports.easyPeasy.currentFolder=()=>{
    const f=gTabmail.currentTabInfo.folder;
    if (!f) {
      return null;
    }
    const s=FolderUtils.getSpecialFolderString(f);
    return s;  //Inbox, Trash, Sent, Drafts, Templates, ...
  }
  
  exports.easyPeasy.showFolder=(active, inactive)=>{
    //  shows special folder of first account
    //  active, inactive=Inbox, Trash, Sent, ...
console.log('showFolder '+active+' or '+inactive);

    const curr=exports.easyPeasy.currentFolder();
    if (!curr) return;

    const show=curr==active?inactive:active;

    let folder=null;
    const account=MailServices.accounts.accounts[0].incomingServer;
console.log('.. uses account: '+account.prettyName);
    let folders=account.rootFolder.subFolders;
    for (const f of folders) {
      const s=FolderUtils.getSpecialFolderString(f);  //Inbox, Trash, Sent, Drafts, Templates, ...
      if (s==show) { folder=f; break; }
    }
    if (!folder) {  // folders are below inbox?
      folders=account.rootFolder.subFolders[0].subFolders;
      for (const f of folders) {
        const s=FolderUtils.getSpecialFolderString(f);  //Inbox, Trash, Sent, Drafts, Templates, ...
      if (s==show) { folder=f; break; }
      }
    }
    if (folder) gTabmail.currentAbout3Pane.displayFolder(folder.URI);
    else console.error('Easy-Peasy: Special folder "'+show+'" not found');
  }

  exports.easyPeasy.addButtons=()=>{
    const toolbar = document.getElementById('unifiedToolbarContent');
    for (const btn of exports.easyPeasy.buttons) {
      //remove old button, if one exists
      let onb=document.querySelector("li[item-id='"+btn.id+"']");
      if (onb) onb.remove();

      if (btn.showIf && !btn.showIf()) continue;

      let nb=document.createElement('li');
      nb.setAttribute('item-id', btn.id);
      if (btn.class) nb.className=btn.class;

      nb.setAttribute('is', 'customizable-element');
      let d=document.createElement('div');
      d.className='live-content';
      nb.appendChild(d);
      let b=document.createElement('button');
      b.setAttribute('is', 'mail-tab-button');
      b.className='unified-toolbar-button button'
        +(btn.class.includes('folder')?' check-button':'');
      if (btn.selected && btn.selected()) b.setAttribute('aria-pressed', 'true');

      if (btn?.title) b.title=btn.title;
      b.setAttribute('onclick', btn.click);
      d.appendChild(b);
      let i=document.createElement('img');
      i.className='button-icon';
      i.style.content='url('+btn.icon+')';
      b.appendChild(i);
      let l=document.createElement('span');
      l.className='button-label';
      l.textContent=btn.label;
      b.appendChild(l);

      //prevent an error message on tab switch
      nb.onTabSwitched=()=>{};
      nb.onTabClosing=()=>{};

      if (btn.pos=='last') toolbar.appendChild(nb);
      else if (btn.pos=='first') toolbar.insertBefore(nb, toolbar.firstChild)
      else if (isNaN(Number(btn.pos))) {  //{+|-}item-id
        let dir=btn.pos.at(0);
        let id=btn.pos;
        if (dir=='+' || dir=='-') id=btn.pos.substring(1);
        else dir='+';
        const e=document.querySelector('li[item-id="'+id+'"]');
        if (!e) {
          console.error('Easy-Peasy: addButtons: button "'+id+'" not found');
          toolbar.appendChild(nb);
        } else {
          if (dir=='-') toolbar.insertBefore(nb, e);
          else toolbar.insertBefore(nb, e.nextSibling);
        }
      } else {  //Number
        let pos=Number(btn.pos);
        if (pos==0) toolbar.insertBefore(nb, toolbar.firstChild)
        else {
          let e=toolbar.firstChild;
          while (pos-- && e) e=e.nextSibling;
          if (e) toolbar.insertBefore(nb, e.nextSibling);
          else toolbar.appendChild(nb);
        }
      }
    }
  } //addButtons

  // Load all button definition files matching BUTTONS-*.def pattern
  exports.easyPeasy.loadButtonModules = () => {
    console.log('Easy-Peasy: Starting loadButtonModules');
    exports.easyPeasy.buttons = [];
    
    try {
      const {FileUtils} = ChromeUtils.importESModule("resource://gre/modules/FileUtils.sys.mjs");
      const dir = FileUtils.getDir("ProfD", ["chrome", "easy-peasy"]);
      
      console.log('Easy-Peasy: Directory path:', dir.path);
      
      if (dir.exists() && dir.isDirectory()) {
        console.log('Easy-Peasy: Directory exists');
        const entries = dir.directoryEntries;
        const defFiles = [];
        
        while (entries.hasMoreElements()) {
          const entry = entries.nextFile;
          if (entry.isFile() && entry.leafName.match(/^BUTTONS-.+\.def$/)) {
            defFiles.push(entry.leafName);
          }
        }
        
        console.log('Easy-Peasy: Found button definition files:', defFiles);
        
        // Load each button definition file using Services.scriptloader
        for (const filename of defFiles) {
          try {
            console.log('Easy-Peasy: Loading file:', filename);
            
            // Create file URI
            const file = dir.clone();
            file.append(filename);
            const fileURI = Services.io.newFileURI(file).spec;
            
            console.log('Easy-Peasy: File URI:', fileURI);
            
            // Create a temporary context object to receive the button
            const context = { button: null, easyPeasy: exports.easyPeasy };
            
            // Load the file - it should define 'var button = {...}'
            Services.scriptloader.loadSubScriptWithOptions(fileURI, {
              target: context,
              charset: "UTF-8",
              ignoreCache: true,
            });
            
            // Check if button was defined
            if (context.button && typeof context.button === 'object') {
              exports.easyPeasy.buttons.push(context.button);
              console.log('Easy-Peasy: Loaded button from ' + filename + ':', context.button.id);
            } else {
              console.error('Easy-Peasy: No button object found in ' + filename);
            }
          } catch (fileError) {
            console.error('Easy-Peasy: Error loading ' + filename + ':', fileError);
          }
        }
      } else {
        console.error('Easy-Peasy: Directory not found');
      }
    } catch (error) {
      console.error('Easy-Peasy: Error loading button modules:', error);
    }
    
    console.log('Easy-Peasy: Loaded ' + exports.easyPeasy.buttons.length + ' buttons');
  };

  // Initialize: Load button modules and add buttons
  console.log('Easy-Peasy: Initializing buttons module');
  exports.easyPeasy.loadButtonModules();
  console.log('Easy-Peasy: After loadButtonModules, calling addButtons');
  exports.easyPeasy.addButtons();

  // re-add buttons after toolbar has been customized
  if (!exports.easyPeasy.button_observer) {
    exports.easyPeasy.button_observer={
      observe() {
        setTimeout(()=>exports.easyPeasy.addButtons(), 200);
      }
    };
    Services.obs.addObserver(exports.easyPeasy.button_observer, 'unified-toolbar-state-change');
  }

  //re-add buttons after a switch of folders
  gTabmail.tabInfo[0].chromeBrowser.contentWindow.addEventListener("folderURIChanged", (event)=>{
    exports.easyPeasy.addButtons();
  });

  //re-add buttons after tabs has been switched
  const tabMonitor={
    monitorName: "eaysPeasy_buttons",
    onTabTitleChanged(tab) {},
    onTabClosing(tab) {},
    onTabPersist(tab) {},
    onTabRestored(tab, state) {},
    onTabOpened(tab) {},
    onTabSwitched(newTab, oldTab) {
      if (newTab.mode.name=='mail3PaneTab') {
        exports.easyPeasy.addButtons();
      }
    },
  };
  gTabmail.registerTabMonitor(tabMonitor);

})(this);