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

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

interface ImportListArgs extends PaginationArgs {
  team_id?: string;
  state?: string;
}

/**
 * imports.list - List imports
 */
const listImports: BaseTool<ImportListArgs> = {
  name: 'outline_list_imports',
  description: 'List document import jobs.',
  inputSchema: {
    type: 'object',
    properties: {
      team_id: { type: 'string', description: 'Filter by team ID (UUID)' },
      state: { type: 'string', description: 'Filter by state (pending, processing, completed, failed)' },
      limit: { type: 'number', description: 'Max results (default: 25)' },
      offset: { type: 'number', description: 'Skip results (default: 0)' },
    },
  },
  handler: async (args, pgClient): Promise<ToolResponse> => {
    const { limit, offset } = validatePagination(args.limit, args.offset);
    const conditions: string[] = [];
    const params: any[] = [];
    let idx = 1;

    if (args.team_id) {
      if (!isValidUUID(args.team_id)) throw new Error('Invalid team_id');
      conditions.push(`i."teamId" = $${idx++}`);
      params.push(args.team_id);
    }
    if (args.state) {
      conditions.push(`i.state = $${idx++}`);
      params.push(args.state);
    }

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

    const result = await pgClient.query(`
      SELECT
        i.id, i.state,
        i."teamId", i."createdById",
        i."createdAt", i."updatedAt",
        u.name as "createdByName",
        t.name as "teamName"
      FROM imports i
      LEFT JOIN users u ON i."createdById" = u.id
      LEFT JOIN teams t ON i."teamId" = t.id
      ${whereClause}
      ORDER BY i."createdAt" DESC
      LIMIT $${idx++} OFFSET $${idx}
    `, [...params, limit, offset]);

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

/**
 * imports.status - Get import status
 */
const getImportStatus: BaseTool<{ id: string }> = {
  name: 'outline_get_import_status',
  description: 'Get detailed status of an import job.',
  inputSchema: {
    type: 'object',
    properties: {
      id: { type: 'string', description: 'Import ID (UUID)' },
    },
    required: ['id'],
  },
  handler: async (args, pgClient): Promise<ToolResponse> => {
    if (!isValidUUID(args.id)) throw new Error('Invalid import ID');

    const result = await pgClient.query(`
      SELECT i.*, u.name as "createdByName"
      FROM imports i
      LEFT JOIN users u ON i."createdById" = u.id
      WHERE i.id = $1
    `, [args.id]);

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

    // Get import tasks
    const tasks = await pgClient.query(`
      SELECT id, state, "documentId", "createdAt"
      FROM import_tasks
      WHERE "importId" = $1
      ORDER BY "createdAt" DESC
      LIMIT 50
    `, [args.id]);

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

/**
 * imports.create - Create import job
 */
const createImport: BaseTool<{ type: string; collection_id?: string }> = {
  name: 'outline_create_import',
  description: 'Create a new import job. Note: This creates the job record, actual file upload handled separately.',
  inputSchema: {
    type: 'object',
    properties: {
      type: { type: 'string', description: 'Import type (e.g., "notion", "confluence", "markdown")' },
      collection_id: { type: 'string', description: 'Target collection ID (UUID, optional)' },
    },
    required: ['type'],
  },
  handler: async (args, pgClient): Promise<ToolResponse> => {
    if (args.collection_id && !isValidUUID(args.collection_id)) throw new Error('Invalid collection_id');

    const team = await pgClient.query(`SELECT id FROM teams WHERE "deletedAt" IS NULL LIMIT 1`);
    if (team.rows.length === 0) throw new Error('No team found');

    const user = await pgClient.query(`SELECT id FROM users WHERE role = 'admin' AND "deletedAt" IS NULL LIMIT 1`);
    if (user.rows.length === 0) throw new Error('No admin user found');

    const result = await pgClient.query(`
      INSERT INTO imports (id, type, state, "teamId", "createdById", "documentCount", "fileCount", "createdAt", "updatedAt")
      VALUES (gen_random_uuid(), $1, 'pending', $2, $3, 0, 0, NOW(), NOW())
      RETURNING *
    `, [args.type, team.rows[0].id, user.rows[0].id]);

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

/**
 * imports.cancel - Cancel import job
 */
const cancelImport: BaseTool<{ id: string }> = {
  name: 'outline_cancel_import',
  description: 'Cancel a pending or processing import job.',
  inputSchema: {
    type: 'object',
    properties: {
      id: { type: 'string', description: 'Import ID (UUID)' },
    },
    required: ['id'],
  },
  handler: async (args, pgClient): Promise<ToolResponse> => {
    if (!isValidUUID(args.id)) throw new Error('Invalid import ID');

    const result = await pgClient.query(`
      UPDATE imports
      SET state = 'cancelled', "updatedAt" = NOW()
      WHERE id = $1 AND state IN ('pending', 'processing')
      RETURNING id, state, type
    `, [args.id]);

    if (result.rows.length === 0) throw new Error('Import not found or cannot be cancelled');

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

export const importsTools: BaseTool<any>[] = [listImports, getImportStatus, createImport, cancelImport];