import QtQml 2.0
import QOwnNotesTypes 1.0
import com.qownnotes.noteapi 1.0

QtObject {
  function init() {
      script.registerCustomAction("zettelCreate", "Create Zettelkasten Zettel", "Zettel", "address-book-new");
      script.registerCustomAction("manualLink", "Insert Zettelkasten Link", "InsertLink", "insert-link");
      script.registerCustomAction("jumpToId", "Follow Zettelkasten Link", "Link", "go-next");
  }

  function customActionInvoked(identifier) {
    switch(identifier) {
    case "zettelCreate":
      onZettelCreateClicked();
      break;
    case "jumpToId":
      onJumpToZettelClicked();
      break;
    case "manualLink":
      onInsertLinkClicked();
      break;
    }
  }

// ----------------------------
// ----- BUTTON FUNCTIONS -----
// ----------------------------

  function onZettelCreateClicked() {
    let uid = exactDate();
    let selected = script.noteTextEditSelectedText();

    // Link the from the old Zettel to the new one if anything was selected
    if(selected !== "") {
      script.log("selected: " + selected);
      createLinkInPlace(uid, selected);
    }

    // Create a Zettel
    createZettel(uid, selected);
  }

  function onInsertLinkClicked() {
    let selected = script.noteTextEditSelectedText();
    let clipboard = script.clipboard();

    let uid = null
    if (verifyZettelId(clipboard)) {
      uid = verifyZettelId(clipboard);
    } else {
      let otherNote = zettelSelectorDialog(true);
      uid = extractZettelIdFromString(otherNote.noteText);
    }

    if (uid == null) {
      return;
    }
    createLinkInPlace(uid, selected)
  }

  function onJumpToZettelClicked() {
    let selected = verifyZettelId(script.noteTextEditSelectedText());

    if(selected == false) {
      script.setCurrentNote(zettelSelectorDialog(true));
    } else {
      script.setCurrentNote(getNoteByZettelId(selected));
    }
  }

// ----------------------------
// --- Autocomplete Linking ---
// ----------------------------

  function autocompletionHook() {
    let uid = verifyZettelId(script.noteTextEditCurrentWord(false));

    if(uid == false) {
      return [];
    }

    let zettel = getNoteByZettelId(uid);
    script.log("Autocomplete detected, Switch to §§" + uid + " - " + zettel.name)

    script.setCurrentNote(zettel);

    return [];
  }


// ----------------------------
// ---- Internal Functions ----
// ----------------------------

  function zettelSelectorDialog(editableTextBox, zettelArray) {
    if (zettelArray == null) {
      zettelArray = [];
      script.fetchNoteIdsByNoteTextPart("§§").forEach(function (noteId){
        let note = script.fetchNoteById(noteId);
        zettelArray.push(note.name + " --id:"+note.id);
      });
    }

    let selected = script.inputDialogGetItem("Zettel", "Select a Zettel", zettelArray, 0, editableTextBox);

    return script.fetchNoteById(selected.substring(selected.search(/--id:/)+5));
  }

  function extractZettelIdFromString(text) {
    let markerpos = text.search(/§§\d{14}\s/) + 2;
    if (markerpos == -1) {
      script.log("No Zettel ID Found in text");
      return;
    }
    return text.substring(markerpos, markerpos+14);
  }

  function verifyZettelId(id) {
    if (id.match(/^§§\d{14}$/) != null) {
      return id.substring(2);
    } else if (id.match(/^\d{14}$/) != null) {
      return id;
    } else {
      return false;
    }
  }

  function getNoteByZettelId(uid) {
    let noteId = script.fetchNoteIdsByNoteTextPart("§§" + uid);
    if (noteId.length == 0) {
      script.log("No note found for Zettel ID: §§" + uid);
      return;
    }
    return script.fetchNoteById(noteId[0]);
  }

  function createLinkInPlace(uid, selected) {
    script.noteTextEditWrite("["+selected+"](zettel://"+uid+")");
  }

  function createZettel(uid, headline) {
    // Create Headline - empty if nothing selected
    if (headline == "") {
      headline = "Zettel"
    }
    let text = headline.toString() + "\n";

    // Create Headline Separator
    text += "===============\n";

    // Create uid tag
    text += "§§" + uid.toString() + "\n\n";

    // Create content unit (i.e. space)
    text += "\n\n\n\n\n";

    // Create Related unit - FIXME add option to automatically link back to the card this was created from
    text += "## Related\n\n\n\n";

    // Create Source unit
    text += "## Reference\n\n";

    script.createNote(text);
    return script.currentNote();
  }

  function exactDate() {
    let date = new Date();
    return (""
    + date.getUTCFullYear().toString()
    + padToLen2((date.getUTCMonth()+1).toString())
    + padToLen2( date.getUTCDate().toString())
    + padToLen2( date.getUTCHours().toString())
    + padToLen2( date.getUTCMinutes().toString())
    + padToLen2( date.getUTCSeconds().toString())
    );
  }

  function padToLen2(text) {
    return ("00" + text).slice(-2)
  }
}