package dev.plex.toml;

import java.util.HashMap;
import java.util.concurrent.atomic.AtomicInteger;

class InlineTableValueReader implements ValueReader {

  static final InlineTableValueReader INLINE_TABLE_VALUE_READER = new InlineTableValueReader();
  
  @Override
  public boolean canRead(String s) {
    return s.startsWith("{");
  }

  @Override
  public Object read(String s, AtomicInteger sharedIndex, Context context) {
    AtomicInteger line = context.line;
    int startLine = line.get();
    int startIndex = sharedIndex.get();
    boolean inKey = true;
    boolean inValue = false;
    boolean terminated = false;
    StringBuilder currentKey = new StringBuilder();
    HashMap<String, Object> results = new HashMap<String, Object>();
    Results.Errors errors = new Results.Errors();
    
    for (int i = sharedIndex.incrementAndGet(); sharedIndex.get() < s.length(); i = sharedIndex.incrementAndGet()) {
      char c = s.charAt(i);
      
      if (inValue && !Character.isWhitespace(c)) {
        Object converted = ValueReaders.VALUE_READERS.convert(s, sharedIndex, context.with(dev.plex.toml.Identifier.from(currentKey.toString(), context)));
        
        if (converted instanceof Results.Errors) {
          errors.add((Results.Errors) converted);
          return errors;
        }
        
        String currentKeyTrimmed = currentKey.toString().trim();
        Object previous = results.put(currentKeyTrimmed, converted);
        
        if (previous != null) {
          errors.duplicateKey(currentKeyTrimmed, context.line.get());
          return errors;
        }
        
        currentKey = new StringBuilder();
        inValue = false;
      } else if (c == ',') {
        inKey = true;
        inValue = false;
        currentKey = new StringBuilder();
      } else if (c == '=') {
        inKey = false;
        inValue = true;
      } else if (c == '}') {
        terminated = true;
        break;
      } else if (inKey) {
        currentKey.append(c);
      }
    }
    
    if (!terminated) {
      errors.unterminated(context.identifier.getName(), s.substring(startIndex), startLine);
    }
    
    if (errors.hasErrors()) {
      return errors;
    }
    
    return results;
  }

  private InlineTableValueReader() {}
}