const express = require('express');
const router = express.Router();
const { budgetRepository, budgetItemRepository } = require('../repositories');

/**
 * Check if site has access to budgeting feature (premium)
 * Budgeting is available in Professional and Enterprise plans
 */
async function hasBudgetingAccess(site_id) {
  // TODO: Implement subscription check
  // For now, assume all sites have access for testing
  return true;
}

/**
 * GET /api/plugins/financials/budgets
 * Get all budgets for a site
 */
router.get('/', async (req, res) => {
  try {
    const { site_id } = req.query;

    if (!site_id) {
      return res.status(400).json({
        success: false,
        error: 'site_id query parameter is required'
      });
    }

    // Check feature access
    if (!(await hasBudgetingAccess(site_id))) {
      return res.status(403).json({
        success: false,
        error: 'Budgeting feature not available',
        message: 'Please upgrade to Professional or Enterprise plan to access budgeting features'
      });
    }

    const budgets = await budgetRepository.findBySiteId(site_id);

    res.json({
      success: true,
      data: budgets,
      message: 'Budgets retrieved successfully'
    });
  } catch (error) {
    console.error('Failed to get budgets:', error);
    res.status(500).json({
      success: false,
      error: 'Failed to retrieve budgets',
      message: error.message
    });
  }
});

/**
 * GET /api/plugins/financials/budgets/:id
 * Get budget by ID
 */
router.get('/:id', async (req, res) => {
  try {
    const { id } = req.params;
    const { site_id } = req.query;

    if (!site_id) {
      return res.status(400).json({
        success: false,
        error: 'site_id is required'
      });
    }

    // Check feature access
    if (!(await hasBudgetingAccess(site_id))) {
      return res.status(403).json({
        success: false,
        error: 'Budgeting feature not available',
        message: 'Please upgrade to Professional or Enterprise plan to access budgeting features'
      });
    }

    const budget = await budgetRepository.findById(id);

    if (!budget) {
      return res.status(404).json({
        success: false,
        error: 'Budget not found'
      });
    }

    // Verify budget belongs to site
    if (budget.site_id !== site_id) {
      return res.status(403).json({
        success: false,
        error: 'Access denied'
      });
    }

    // Get budget items
    const items = await budgetItemRepository.findByBudgetId(id);

    res.json({
      success: true,
      data: {
        ...budget,
        items
      },
      message: 'Budget details retrieved successfully'
    });
  } catch (error) {
    console.error('Failed to get budget:', error);
    res.status(500).json({
      success: false,
      error: 'Failed to retrieve budget',
      message: error.message
    });
  }
});

/**
 * POST /api/plugins/financials/budgets
 * Create a new budget
 */
router.post('/', async (req, res) => {
  try {
    const { site_id, name, description, fiscal_year, start_date, end_date, total_amount, status, items, created_by } = req.body;

    if (!site_id || !name || !fiscal_year || !start_date || !end_date || !total_amount) {
      return res.status(400).json({
        success: false,
        error: 'Missing required fields',
        message: 'Site ID, name, fiscal year, start date, end date, and total amount are required'
      });
    }

    // Check feature access
    if (!(await hasBudgetingAccess(site_id))) {
      return res.status(403).json({
        success: false,
        error: 'Budgeting feature not available',
        message: 'Please upgrade to Professional or Enterprise plan to access budgeting features'
      });
    }

    const budget = await budgetRepository.createBudget({
      site_id,
      name,
      description,
      fiscal_year,
      start_date,
      end_date,
      total_amount,
      status,
      created_by: created_by || req.user?.id || 'system'
    });

    // Create budget items if provided
    if (items && Array.isArray(items)) {
      for (const item of items) {
        await budgetItemRepository.createItem({
          budget_id: budget.id,
          account_id: item.account_id,
          planned_amount: item.planned_amount,
          notes: item.notes
        });
      }
    }

    res.status(201).json({
      success: true,
      data: budget,
      message: 'Budget created successfully'
    });
  } catch (error) {
    console.error('Failed to create budget:', error);
    res.status(500).json({
      success: false,
      error: 'Failed to create budget',
      message: error.message
    });
  }
});

/**
 * POST /api/plugins/financials/budgets/:id/items
 * Add budget item
 */
router.post('/:id/items', async (req, res) => {
  try {
    const { id } = req.params;
    const { account_id, planned_amount, notes } = req.body;
    const { site_id } = req.query;

    if (!site_id) {
      return res.status(400).json({
        success: false,
        error: 'site_id is required'
      });
    }

    // Validate required fields
    if (!account_id || !planned_amount) {
      return res.status(400).json({
        success: false,
        error: 'Missing required fields',
        message: 'Account ID and planned amount are required'
      });
    }

    // Check feature access
    if (!(await hasBudgetingAccess(site_id))) {
      return res.status(403).json({
        success: false,
        error: 'Budgeting feature not available',
        message: 'Please upgrade to Professional or Enterprise plan to access budgeting features'
      });
    }

    const item = await budgetItemRepository.createItem({
      budget_id: id,
      account_id,
      planned_amount,
      notes
    });

    res.status(201).json({
      success: true,
      data: item,
      message: 'Budget item added successfully'
    });
  } catch (error) {
    console.error('Failed to add budget item:', error);
    res.status(500).json({
      success: false,
      error: 'Failed to add budget item',
      message: error.message
    });
  }
});

module.exports = router;