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// CodeMirror, copyright (c) by Marijn Haverbeke and others
// Distributed under an MIT license: https://codemirror.net/LICENSE

(function(mod) {
  if (typeof exports == "object" && typeof module == "object") // CommonJS
    mod(require("../../lib/codemirror"));
  else if (typeof define == "function" && define.amd) // AMD
    define(["../../lib/codemirror"], mod);
  else // Plain browser env
    mod(CodeMirror);
})(function(CodeMirror) {
"use strict";

CodeMirror.registerHelper("fold", "brace", function(cm, start) {
  var line = start.line, lineText = cm.getLine(line);

  function findOpening(openCh) {
    var tokenType;
    for (var at = start.ch, pass = 0;;) {
      var found = at <= 0 ? -1 : lineText.lastIndexOf(openCh, at - 1);
      if (found == -1) {
        if (pass == 1) break;
        pass = 1;
        at = lineText.length;
        continue;
      }
      if (pass == 1 && found < start.ch) break;
      tokenType = cm.getTokenTypeAt(CodeMirror.Pos(line, found + 1));
      if (!/^(comment|string)/.test(tokenType)) return {ch: found + 1, tokenType: tokenType};
      at = found - 1;
    }
  }

  function findRange(startToken, endToken, found) {
    var count = 1, lastLine = cm.lastLine(), end, startCh = found.ch, endCh
    outer: for (var i = line; i <= lastLine; ++i) {
      var text = cm.getLine(i), pos = i == line ? startCh : 0;
      for (;;) {
        var nextOpen = text.indexOf(startToken, pos), nextClose = text.indexOf(endToken, pos);
        if (nextOpen < 0) nextOpen = text.length;
        if (nextClose < 0) nextClose = text.length;
        pos = Math.min(nextOpen, nextClose);
        if (pos == text.length) break;
        if (cm.getTokenTypeAt(CodeMirror.Pos(i, pos + 1)) == found.tokenType) {
          if (pos == nextOpen) ++count;
          else if (!--count) { end = i; endCh = pos; break outer; }
        }
        ++pos;
      }
    }

    if (end == null || line == end) return null
    return {from: CodeMirror.Pos(line, startCh),
            to: CodeMirror.Pos(end, endCh)};
  }

  var startBrace = findOpening("{"), startBracket = findOpening("[")
  if (startBrace && (!startBracket || startBracket.ch > startBrace.ch)) {
    return findRange("{", "}", startBrace) || (startBracket && findRange("[", "]", startBracket))
  } else if (startBracket) {
    return findRange("[", "]", startBracket) || (startBrace && findRange("{", "}", startBrace))
  } else {
    return null
  }
});

CodeMirror.registerHelper("fold", "import", function(cm, start) {
  function hasImport(line) {
    if (line < cm.firstLine() || line > cm.lastLine()) return null;
    var start = cm.getTokenAt(CodeMirror.Pos(line, 1));
    if (!/\S/.test(start.string)) start = cm.getTokenAt(CodeMirror.Pos(line, start.end + 1));
    if (start.type != "keyword" || start.string != "import") return null;
    // Now find closing semicolon, return its position
    for (var i = line, e = Math.min(cm.lastLine(), line + 10); i <= e; ++i) {
      var text = cm.getLine(i), semi = text.indexOf(";");
      if (semi != -1) return {startCh: start.end, end: CodeMirror.Pos(i, semi)};
    }
  }

  var startLine = start.line, has = hasImport(startLine), prev;
  if (!has || hasImport(startLine - 1) || ((prev = hasImport(startLine - 2)) && prev.end.line == startLine - 1))
    return null;
  for (var end = has.end;;) {
    var next = hasImport(end.line + 1);
    if (next == null) break;
    end = next.end;
  }
  return {from: cm.clipPos(CodeMirror.Pos(startLine, has.startCh + 1)), to: end};
});

CodeMirror.registerHelper("fold", "include", function(cm, start) {
  function hasInclude(line) {
    if (line < cm.firstLine() || line > cm.lastLine()) return null;
    var start = cm.getTokenAt(CodeMirror.Pos(line, 1));
    if (!/\S/.test(start.string)) start = cm.getTokenAt(CodeMirror.Pos(line, start.end + 1));
    if (start.type == "meta" && start.string.slice(0, 8) == "#include") return start.start + 8;
  }

  var startLine = start.line, has = hasInclude(startLine);
  if (has == null || hasInclude(startLine - 1) != null) return null;
  for (var end = startLine;;) {
    var next = hasInclude(end + 1);
    if (next == null) break;
    ++end;
  }
  return {from: CodeMirror.Pos(startLine, has + 1),
          to: cm.clipPos(CodeMirror.Pos(end))};
});

});