'use strict';

const buildChapterTree = (chapters = [], blocks = []) => {
   const nodeMap = new Map();
   chapters.forEach(chapter => {
      nodeMap.set(chapter.id, {
         ...chapter,
         blocks: [],
         children: [],
      });
   });

   blocks.forEach(block => {
      const node = nodeMap.get(block.chapterId);
      if (node) {
         node.blocks.push(block);
      }
   });

   const roots = [];
   chapters.forEach(chapter => {
      const node = nodeMap.get(chapter.id);
      if (chapter.parentId && nodeMap.has(chapter.parentId)) {
         nodeMap.get(chapter.parentId).children.push(node);
      } else {
         roots.push(node);
      }
   });

   const sortNodes = (nodes = []) => {
      nodes.sort((a, b) => a.position - b.position || a.id - b.id);
      nodes.forEach(node => {
         node.blocks.sort((a, b) => a.position - b.position || a.id - b.id);
         sortNodes(node.children);
      });
   };
   sortNodes(roots);
   return roots;
};

const buildDocxImportChapterPayload = (nodes = [], sourceFileUrl, sourceFileName) => {
   return nodes.map((node, index) => ({
      title: String(node.title || `Chapter ${index + 1}`),
      position: index + 1,
      blocks: [
         {
            blockType: 'text',
            position: 1,
            config: {
               format: 'html',
               source: 'docxImport',
               sourceFileUrl,
               sourceFileName,
            },
            contentSnapshot: {
               content: String(node.contentHtml || ''),
            },
         }
      ],
      children: buildDocxImportChapterPayload(node.children || [], sourceFileUrl, sourceFileName),
   }));
};

module.exports = {
   buildChapterTree,
   buildDocxImportChapterPayload,
};