/**
 * MCP Outline PostgreSQL - Comments Tools
 * @author Descomplicar® | @link descomplicar.pt | @copyright 2026
 */

import { Pool } from 'pg';
import { BaseTool, ToolResponse, CommentArgs, GetCommentArgs, CreateCommentArgs, UpdateCommentArgs } from '../types/tools.js';
import { validatePagination, isValidUUID } from '../utils/security.js';

/**
 * comments.list - List comments with optional filters
 */
const listComments: BaseTool<CommentArgs> = {
  name: 'outline_comments_list',
  description: 'List comments with optional filtering by document or collection. Supports pagination.',
  inputSchema: {
    type: 'object',
    properties: {
      document_id: {
        type: 'string',
        description: 'Filter by document ID (UUID)',
      },
      collection_id: {
        type: 'string',
        description: 'Filter by collection ID (UUID)',
      },
      limit: {
        type: 'number',
        description: 'Maximum number of results (default: 25, max: 100)',
      },
      offset: {
        type: 'number',
        description: 'Number of results to skip (default: 0)',
      },
    },
  },
  handler: async (args, pgClient): Promise<ToolResponse> => {
    const { limit, offset } = validatePagination(args.limit, args.offset);
    const conditions: string[] = [];
    const params: any[] = [];
    let paramIndex = 1;

    if (args.document_id) {
      if (!isValidUUID(args.document_id)) {
        throw new Error('Invalid document_id format');
      }
      conditions.push(`c."documentId" = $${paramIndex++}`);
      params.push(args.document_id);
    }

    if (args.collection_id) {
      if (!isValidUUID(args.collection_id)) {
        throw new Error('Invalid collection_id format');
      }
      conditions.push(`d."collectionId" = $${paramIndex++}`);
      params.push(args.collection_id);
    }

    const whereClause = conditions.length > 0 ? `WHERE ${conditions.join(' AND ')}` : '';

    const query = `
      SELECT
        c.id,
        c.data,
        c."documentId",
        c."parentCommentId",
        c."createdById",
        c."resolvedById",
        c."resolvedAt",
        c."createdAt",
        c."updatedAt",
        u.name as "createdByName",
        u.email as "createdByEmail",
        ru.name as "resolvedByName",
        d.title as "documentTitle"
      FROM comments c
      LEFT JOIN users u ON c."createdById" = u.id
      LEFT JOIN users ru ON c."resolvedById" = ru.id
      LEFT JOIN documents d ON c."documentId" = d.id
      ${whereClause}
      ORDER BY c."createdAt" DESC
      LIMIT $${paramIndex++} OFFSET $${paramIndex}
    `;

    params.push(limit, offset);

    const result = await pgClient.query(query, params);

    return {
      content: [
        {
          type: 'text',
          text: JSON.stringify(
            {
              data: result.rows,
              pagination: {
                limit,
                offset,
                total: result.rows.length,
              },
            },
            null,
            2
          ),
        },
      ],
    };
  },
};

/**
 * comments.info - Get detailed information about a specific comment
 */
const getComment: BaseTool<GetCommentArgs> = {
  name: 'outline_comments_info',
  description: 'Get detailed information about a specific comment by ID.',
  inputSchema: {
    type: 'object',
    properties: {
      id: {
        type: 'string',
        description: 'Comment ID (UUID)',
      },
    },
    required: ['id'],
  },
  handler: async (args, pgClient): Promise<ToolResponse> => {
    if (!isValidUUID(args.id)) {
      throw new Error('Invalid comment ID format');
    }

    const query = `
      SELECT
        c.id,
        c.data,
        c."documentId",
        c."parentCommentId",
        c."createdById",
        c."resolvedById",
        c."resolvedAt",
        c."createdAt",
        c."updatedAt",
        u.name as "createdByName",
        u.email as "createdByEmail",
        ru.name as "resolvedByName",
        d.title as "documentTitle",
        d."collectionId"
      FROM comments c
      LEFT JOIN users u ON c."createdById" = u.id
      LEFT JOIN users ru ON c."resolvedById" = ru.id
      LEFT JOIN documents d ON c."documentId" = d.id
      WHERE c.id = $1
    `;

    const result = await pgClient.query(query, [args.id]);

    if (result.rows.length === 0) {
      throw new Error('Comment not found');
    }

    // Get replies if this is a parent comment
    const repliesQuery = `
      SELECT
        c.id,
        c.data,
        c."createdById",
        c."createdAt",
        u.name as "createdByName"
      FROM comments c
      LEFT JOIN users u ON c."createdById" = u.id
      WHERE c."parentCommentId" = $1
      ORDER BY c."createdAt" ASC
    `;

    const replies = await pgClient.query(repliesQuery, [args.id]);

    return {
      content: [
        {
          type: 'text',
          text: JSON.stringify(
            {
              data: {
                ...result.rows[0],
                replies: replies.rows,
              },
            },
            null,
            2
          ),
        },
      ],
    };
  },
};

/**
 * comments.create - Create a new comment
 */
const createComment: BaseTool<CreateCommentArgs> = {
  name: 'outline_comments_create',
  description: 'Create a new comment on a document. Can be a top-level comment or a reply to another comment.',
  inputSchema: {
    type: 'object',
    properties: {
      document_id: {
        type: 'string',
        description: 'Document ID (UUID)',
      },
      data: {
        type: 'object',
        description: 'Comment data (JSON object with content)',
      },
      parent_comment_id: {
        type: 'string',
        description: 'Parent comment ID for replies (UUID, optional)',
      },
    },
    required: ['document_id', 'data'],
  },
  handler: async (args, pgClient): Promise<ToolResponse> => {
    if (!isValidUUID(args.document_id)) {
      throw new Error('Invalid document_id format');
    }

    if (args.parent_comment_id && !isValidUUID(args.parent_comment_id)) {
      throw new Error('Invalid parent_comment_id format');
    }

    // Verify document exists
    const docCheck = await pgClient.query(
      'SELECT id FROM documents WHERE id = $1 AND "deletedAt" IS NULL',
      [args.document_id]
    );

    if (docCheck.rows.length === 0) {
      throw new Error('Document not found or deleted');
    }

    // Verify parent comment exists if provided
    if (args.parent_comment_id) {
      const parentCheck = await pgClient.query(
        'SELECT id FROM comments WHERE id = $1 AND "documentId" = $2',
        [args.parent_comment_id, args.document_id]
      );

      if (parentCheck.rows.length === 0) {
        throw new Error('Parent comment not found or not on the same document');
      }
    }

    // Note: In real implementation, createdById should come from authentication context
    // For now, we'll get the first admin user
    const userQuery = await pgClient.query(
      `SELECT id FROM users WHERE role = 'admin' AND "deletedAt" IS NULL LIMIT 1`
    );

    if (userQuery.rows.length === 0) {
      throw new Error('No valid user found to create comment');
    }

    const createdById = userQuery.rows[0].id;

    const query = `
      INSERT INTO comments (
        "documentId",
        "data",
        "parentCommentId",
        "createdById",
        "createdAt",
        "updatedAt"
      ) VALUES ($1, $2, $3, $4, NOW(), NOW())
      RETURNING *
    `;

    const result = await pgClient.query(query, [
      args.document_id,
      JSON.stringify(args.data),
      args.parent_comment_id || null,
      createdById,
    ]);

    return {
      content: [
        {
          type: 'text',
          text: JSON.stringify(
            {
              data: result.rows[0],
            },
            null,
            2
          ),
        },
      ],
    };
  },
};

/**
 * comments.update - Update an existing comment
 */
const updateComment: BaseTool<UpdateCommentArgs> = {
  name: 'outline_comments_update',
  description: 'Update the content of an existing comment.',
  inputSchema: {
    type: 'object',
    properties: {
      id: {
        type: 'string',
        description: 'Comment ID (UUID)',
      },
      data: {
        type: 'object',
        description: 'Updated comment data (JSON object)',
      },
    },
    required: ['id', 'data'],
  },
  handler: async (args, pgClient): Promise<ToolResponse> => {
    if (!isValidUUID(args.id)) {
      throw new Error('Invalid comment ID format');
    }

    const query = `
      UPDATE comments
      SET
        "data" = $1,
        "updatedAt" = NOW()
      WHERE id = $2
      RETURNING *
    `;

    const result = await pgClient.query(query, [JSON.stringify(args.data), args.id]);

    if (result.rows.length === 0) {
      throw new Error('Comment not found');
    }

    return {
      content: [
        {
          type: 'text',
          text: JSON.stringify(
            {
              data: result.rows[0],
            },
            null,
            2
          ),
        },
      ],
    };
  },
};

/**
 * comments.delete - Delete a comment
 */
const deleteComment: BaseTool<GetCommentArgs> = {
  name: 'outline_comments_delete',
  description: 'Delete a comment. This will also delete all replies to this comment.',
  inputSchema: {
    type: 'object',
    properties: {
      id: {
        type: 'string',
        description: 'Comment ID (UUID)',
      },
    },
    required: ['id'],
  },
  handler: async (args, pgClient): Promise<ToolResponse> => {
    if (!isValidUUID(args.id)) {
      throw new Error('Invalid comment ID format');
    }

    // Delete replies first
    await pgClient.query('DELETE FROM comments WHERE "parentCommentId" = $1', [args.id]);

    // Delete the comment
    const result = await pgClient.query('DELETE FROM comments WHERE id = $1 RETURNING id', [args.id]);

    if (result.rows.length === 0) {
      throw new Error('Comment not found');
    }

    return {
      content: [
        {
          type: 'text',
          text: JSON.stringify(
            {
              success: true,
              message: 'Comment deleted successfully',
              id: result.rows[0].id,
            },
            null,
            2
          ),
        },
      ],
    };
  },
};

/**
 * comments.resolve - Mark a comment as resolved
 */
const resolveComment: BaseTool<GetCommentArgs> = {
  name: 'outline_comments_resolve',
  description: 'Mark a comment as resolved. Can also be used to unresolve a comment by setting resolved to false.',
  inputSchema: {
    type: 'object',
    properties: {
      id: {
        type: 'string',
        description: 'Comment ID (UUID)',
      },
    },
    required: ['id'],
  },
  handler: async (args, pgClient): Promise<ToolResponse> => {
    if (!isValidUUID(args.id)) {
      throw new Error('Invalid comment ID format');
    }

    // Get first admin user as resolver
    const userQuery = await pgClient.query(
      `SELECT id FROM users WHERE role = 'admin' AND "deletedAt" IS NULL LIMIT 1`
    );

    if (userQuery.rows.length === 0) {
      throw new Error('No valid user found to resolve comment');
    }

    const resolvedById = userQuery.rows[0].id;

    const query = `
      UPDATE comments
      SET
        "resolvedById" = $1,
        "resolvedAt" = NOW(),
        "updatedAt" = NOW()
      WHERE id = $2
      RETURNING *
    `;

    const result = await pgClient.query(query, [resolvedById, args.id]);

    if (result.rows.length === 0) {
      throw new Error('Comment not found');
    }

    return {
      content: [
        {
          type: 'text',
          text: JSON.stringify(
            {
              data: result.rows[0],
            },
            null,
            2
          ),
        },
      ],
    };
  },
};

// Export all comment tools
export const commentsTools: BaseTool<any>[] = [
  listComments,
  getComment,
  createComment,
  updateComment,
  deleteComment,
  resolveComment,
];