import { EmailBlock, CardType, ButtonStyle } from './types';

/**
 * Convert markdown to blocks - respects [card]...[/card] boundaries
 */
export function markdownToBlocks(markdown: string): EmailBlock[] {
  const blocks: EmailBlock[] = [];
  let blockId = 0;
  let pos = 0;
  
  while (pos < markdown.length) {
    // Skip whitespace
    while (pos < markdown.length && /\s/.test(markdown[pos])) pos++;
    if (pos >= markdown.length) break;
    
    const id = `block-${Date.now()}-${blockId++}`;
    
    // Check for [card]
    if (markdown.substr(pos, 5) === '[card') {
      const cardStart = pos;
      const cardOpenEnd = markdown.indexOf(']', pos);
      const cardClose = markdown.indexOf('[/card]', pos);
      
      if (cardOpenEnd !== -1 && cardClose !== -1) {
        const attributes = markdown.substring(pos + 5, cardOpenEnd);
        const content = markdown.substring(cardOpenEnd + 1, cardClose).trim();
        
        // Parse type
        const typeMatch = attributes.match(/type\s*=\s*["']([^"']+)["']/);
        const cardType = (typeMatch?.[1] || 'default') as CardType;
        
        blocks.push({
          id,
          type: 'card',
          cardType,
          content,
        });
        
        pos = cardClose + 7; // Skip [/card]
        continue;
      }
    }
    
    // Check for [button]
    if (markdown.substr(pos, 7) === '[button') {
      const buttonEnd = markdown.indexOf('[/button]', pos);
      if (buttonEnd !== -1) {
        const fullButton = markdown.substring(pos, buttonEnd + 9);
        const match = fullButton.match(/\[button\s+url=["']([^"']+)["'](?:\s+style=["'](solid|outline)["'])?\]([^\[]+)\[\/button\]/);
        
        if (match) {
          blocks.push({
            id,
            type: 'button',
            text: match[3].trim(),
            link: match[1],
            style: (match[2] || 'solid') as ButtonStyle,
            align: 'center',
            widthMode: 'fit',
          });
          
          pos = buttonEnd + 9;
          continue;
        }
      }
    }
    
    // Skip unknown content
    pos++;
  }
  
  return blocks;
}