/**
 * MCP Outline PostgreSQL - Export/Import Tools
 * Advanced export to Markdown and import from Markdown folders
 * @author Descomplicar® | @link descomplicar.pt | @copyright 2026
 */

import { BaseTool, ToolResponse } from '../types/tools.js';
import { isValidUUID, sanitizeInput } from '../utils/security.js';
import { withTransaction } from '../utils/transaction.js';

interface ExportCollectionArgs {
  collection_id: string;
  include_children?: boolean;
  include_metadata?: boolean;
  format?: 'markdown' | 'json';
}

interface ImportMarkdownArgs {
  collection_id: string;
  documents: Array<{
    title: string;
    content: string;
    parent_path?: string;
    emoji?: string;
  }>;
  create_hierarchy?: boolean;
}

/**
 * export.collection_to_markdown - Export entire collection to Markdown
 */
const exportCollectionToMarkdown: BaseTool<ExportCollectionArgs> = {
  name: 'outline_export_collection_to_markdown',
  description: 'Export an entire collection to Markdown format with document hierarchy.',
  inputSchema: {
    type: 'object',
    properties: {
      collection_id: { type: 'string', description: 'Collection ID (UUID)' },
      include_children: { type: 'boolean', description: 'Include nested documents (default: true)' },
      include_metadata: { type: 'boolean', description: 'Include YAML frontmatter with metadata (default: true)' },
      format: { type: 'string', enum: ['markdown', 'json'], description: 'Output format (default: markdown)' },
    },
    required: ['collection_id'],
  },
  handler: async (args, pgClient): Promise<ToolResponse> => {
    if (!isValidUUID(args.collection_id)) throw new Error('Invalid collection_id');

    const includeChildren = args.include_children !== false;
    const includeMetadata = args.include_metadata !== false;
    const format = args.format || 'markdown';

    // Get collection info
    const collection = await pgClient.query(`
      SELECT id, name, description, icon, color
      FROM collections
      WHERE id = $1 AND "deletedAt" IS NULL
    `, [args.collection_id]);

    if (collection.rows.length === 0) throw new Error('Collection not found');

    // Get all documents in collection
    const documents = await pgClient.query(`
      WITH RECURSIVE doc_tree AS (
        SELECT
          d.id, d.title, d.text, d.emoji, d."parentDocumentId",
          d."createdAt", d."updatedAt", d."publishedAt",
          u.name as "authorName",
          0 as depth,
          d.title as path
        FROM documents d
        LEFT JOIN users u ON d."createdById" = u.id
        WHERE d."collectionId" = $1
          AND d."parentDocumentId" IS NULL
          AND d."deletedAt" IS NULL
          AND d.template = false

        UNION ALL

        SELECT
          d.id, d.title, d.text, d.emoji, d."parentDocumentId",
          d."createdAt", d."updatedAt", d."publishedAt",
          u.name as "authorName",
          dt.depth + 1,
          dt.path || '/' || d.title
        FROM documents d
        LEFT JOIN users u ON d."createdById" = u.id
        JOIN doc_tree dt ON d."parentDocumentId" = dt.id
        WHERE d."deletedAt" IS NULL AND d.template = false
      )
      SELECT * FROM doc_tree
      ORDER BY path
    `, [args.collection_id]);

    if (format === 'json') {
      return {
        content: [{ type: 'text', text: JSON.stringify({
          collection: collection.rows[0],
          documents: documents.rows,
          exportedAt: new Date().toISOString(),
          totalDocuments: documents.rows.length,
        }, null, 2) }],
      };
    }

    // Build Markdown output
    const markdownFiles: Array<{ path: string; content: string }> = [];

    for (const doc of documents.rows) {
      let content = '';

      if (includeMetadata) {
        content += '---\n';
        content += `title: "${doc.title.replace(/"/g, '\\"')}"\n`;
        if (doc.emoji) content += `emoji: "${doc.emoji}"\n`;
        content += `author: "${doc.authorName || 'Unknown'}"\n`;
        content += `created: ${doc.createdAt}\n`;
        content += `updated: ${doc.updatedAt}\n`;
        if (doc.publishedAt) content += `published: ${doc.publishedAt}\n`;
        content += `outline_id: ${doc.id}\n`;
        content += '---\n\n';
      }

      // Add title as H1 if not already in content
      if (!doc.text?.startsWith('# ')) {
        content += `# ${doc.emoji ? doc.emoji + ' ' : ''}${doc.title}\n\n`;
      }

      content += doc.text || '';

      const fileName = doc.path
        .replace(/[^a-zA-Z0-9\/\-_\s]/g, '')
        .replace(/\s+/g, '-')
        .toLowerCase();

      markdownFiles.push({
        path: `${fileName}.md`,
        content,
      });
    }

    return {
      content: [{ type: 'text', text: JSON.stringify({
        collection: {
          name: collection.rows[0].name,
          description: collection.rows[0].description,
        },
        files: markdownFiles,
        exportedAt: new Date().toISOString(),
        totalFiles: markdownFiles.length,
        message: `Exported ${markdownFiles.length} documents from collection "${collection.rows[0].name}"`,
      }, null, 2) }],
    };
  },
};

/**
 * import.markdown_folder - Import Markdown documents into collection
 */
const importMarkdownFolder: BaseTool<ImportMarkdownArgs> = {
  name: 'outline_import_markdown_folder',
  description: 'Import multiple Markdown documents into a collection, preserving hierarchy.',
  inputSchema: {
    type: 'object',
    properties: {
      collection_id: { type: 'string', description: 'Target collection ID (UUID)' },
      documents: {
        type: 'array',
        items: {
          type: 'object',
          properties: {
            title: { type: 'string', description: 'Document title' },
            content: { type: 'string', description: 'Markdown content' },
            parent_path: { type: 'string', description: 'Parent document path (e.g., "parent/child")' },
            emoji: { type: 'string', description: 'Document emoji' },
          },
          required: ['title', 'content'],
        },
        description: 'Array of documents to import',
      },
      create_hierarchy: { type: 'boolean', description: 'Create parent documents if they don\'t exist (default: true)' },
    },
    required: ['collection_id', 'documents'],
  },
  handler: async (args, pgClient): Promise<ToolResponse> => {
    if (!isValidUUID(args.collection_id)) throw new Error('Invalid collection_id');
    if (!args.documents || args.documents.length === 0) throw new Error('At least one document required');
    if (args.documents.length > 100) throw new Error('Maximum 100 documents per import');

    const createHierarchy = args.create_hierarchy !== false;

    // Use transaction for atomic import (all documents or none)
    const { imported, errors } = await withTransaction(pgClient, async (client) => {
      // Verify collection exists
      const collection = await client.query(
        `SELECT id, "teamId" FROM collections WHERE id = $1 AND "deletedAt" IS NULL`,
        [args.collection_id]
      );
      if (collection.rows.length === 0) throw new Error('Collection not found');

      const teamId = collection.rows[0].teamId;

      // Get admin user for createdById
      const userResult = await client.query(
        `SELECT id FROM users WHERE role = 'admin' AND "deletedAt" IS NULL LIMIT 1`
      );
      if (userResult.rows.length === 0) throw new Error('No admin user found');
      const userId = userResult.rows[0].id;

      const importedList: Array<{ id: string; title: string; path: string }> = [];
      const errorList: Array<{ title: string; error: string }> = [];
      const pathToId: Record<string, string> = {};

      // First pass: create all documents (sorted by path depth)
      const sortedDocs = [...args.documents].sort((a, b) => {
        const depthA = (a.parent_path || '').split('/').filter(Boolean).length;
        const depthB = (b.parent_path || '').split('/').filter(Boolean).length;
        return depthA - depthB;
      });

      for (const doc of sortedDocs) {
        try {
          let parentDocumentId: string | null = null;

          // Resolve parent if specified
          if (doc.parent_path && createHierarchy) {
            const parentPath = doc.parent_path.trim();

            if (pathToId[parentPath]) {
              parentDocumentId = pathToId[parentPath];
            } else {
              // Try to find existing parent by title
              const parentTitle = parentPath.split('/').pop();
              const existingParent = await client.query(
                `SELECT id FROM documents WHERE title = $1 AND "collectionId" = $2 AND "deletedAt" IS NULL LIMIT 1`,
                [parentTitle, args.collection_id]
              );

              if (existingParent.rows.length > 0) {
                parentDocumentId = existingParent.rows[0].id;
                if (parentDocumentId) {
                  pathToId[parentPath] = parentDocumentId;
                }
              }
            }
          }

          // Strip YAML frontmatter if present
          let content = doc.content;
          if (content.startsWith('---')) {
            const endOfFrontmatter = content.indexOf('---', 3);
            if (endOfFrontmatter !== -1) {
              content = content.substring(endOfFrontmatter + 3).trim();
            }
          }

          // Create document
          const result = await client.query(`
            INSERT INTO documents (
              id, title, text, emoji, "collectionId", "teamId", "parentDocumentId",
              "createdById", "lastModifiedById", template, "createdAt", "updatedAt"
            )
            VALUES (
              gen_random_uuid(), $1, $2, $3, $4, $5, $6, $7, $7, false, NOW(), NOW()
            )
            RETURNING id, title
          `, [
            sanitizeInput(doc.title),
            content,
            doc.emoji || null,
            args.collection_id,
            teamId,
            parentDocumentId,
            userId,
          ]);

          const newDoc = result.rows[0];
          const fullPath = doc.parent_path ? `${doc.parent_path}/${doc.title}` : doc.title;
          pathToId[fullPath] = newDoc.id;

          importedList.push({
            id: newDoc.id,
            title: newDoc.title,
            path: fullPath,
          });
        } catch (error) {
          errorList.push({
            title: doc.title,
            error: error instanceof Error ? error.message : String(error),
          });
        }
      }

      return { imported: importedList, errors: errorList };
    });

    return {
      content: [{ type: 'text', text: JSON.stringify({
        imported,
        errors,
        importedCount: imported.length,
        errorCount: errors.length,
        collectionId: args.collection_id,
        message: `Imported ${imported.length} documents${errors.length > 0 ? `, ${errors.length} failed` : ''}`,
      }, null, 2) }],
    };
  },
};

export const exportImportTools: BaseTool<any>[] = [exportCollectionToMarkdown, importMarkdownFolder];