// node_api/routes/asset_components.js
const express = require('express');
const { Pool } = require('pg');
const router = express.Router();

// Database connection pool
const pool = new Pool({
  host: process.env.DB_HOST || 'localhost',
  port: process.env.DB_PORT || 5432,
  database: process.env.DB_DATABASE || 'asset_management',
  user: process.env.DB_USERNAME || 'directus',
  password: process.env.DB_PASSWORD || 'directus',
  max: 10,
  idleTimeoutMillis: 30000,
  connectionTimeoutMillis: 2000,
});

// Helper function to format component data
const formatComponentData = (component) => ({
  id: component.id,
  component_identifier: component.component_identifier,
  name: component.name,
  description: component.description,
  component_type: component.component_type,
  component_type_name: component.component_type_name,
  model_number: component.model_number,
  serial_number: component.serial_number,
  manufacturer: component.manufacturer,
  acquisition_cost: parseFloat(component.acquisition_cost) || 0,
  net_book_value: parseFloat(component.net_book_value) || 0,
  total_accumulated_depreciation: parseFloat(component.total_accumulated_depreciation) || 0,
  depreciation_percentage_rate: parseFloat(component.depreciation_percentage_rate) || 0,
  expected_useful_life_months: parseInt(component.expected_useful_life_months) || 0,
  salvage_value: parseFloat(component.salvage_value) || 0,
  status: component.status,
  condition_rating: component.condition_rating,
  installation_date: component.installation_date,
  acquisition_date: component.acquisition_date,
  warranty_start_date: component.warranty_start_date,
  warranty_expiration_date: component.warranty_expiration_date,
  is_critical: component.is_critical,
  maintenance_status: component.maintenance_status,
  next_maintenance_date: component.next_maintenance_date,
  last_maintenance_date: component.last_maintenance_date,
  parent_asset_id: component.parent_asset_id,
  parent_asset_name: component.parent_asset_name,
  parent_asset_identifier: component.parent_asset_identifier,
  depreciation_status: component.depreciation_status,
  age_in_months: component.age_in_months,
  date_created: component.date_created,
  date_updated: component.date_updated
});

/**
 * Get all asset components for a specific asset
 */
router.get('/asset/:assetId', async (req, res) => {
  try {
    const { assetId } = req.params;
    
    const query = `
      SELECT * FROM get_asset_components($1)
    `;
    
    const result = await pool.query(query, [assetId]);
    
    const components = result.rows.map(formatComponentData);
    
    res.json({
      success: true,
      data: components,
      total: components.length
    });
  } catch (error) {
    console.error('Error fetching asset components:', error);
    res.status(500).json({ 
      success: false, 
      error: 'Failed to fetch asset components' 
    });
  }
});

/**
 * Get single asset component by ID
 */
router.get('/:componentId', async (req, res) => {
  try {
    const { componentId } = req.params;
    
    const query = `
      SELECT 
        ac.*,
        a.name as parent_asset_name,
        a.asset_identifier as parent_asset_identifier,
        a.status as parent_asset_status,
        l.name as parent_location_name,
        act.name as component_type_name,
        act.is_critical as type_is_critical,
        afs.depreciation_status,
        afs.age_in_months
      FROM asset_components ac
      JOIN assets a ON ac.parent_asset_id = a.id
      LEFT JOIN locations l ON a.location_id = l.id
      LEFT JOIN asset_component_types act ON ac.component_type_id = act.id
      LEFT JOIN asset_components_financial_status afs ON ac.id = afs.id
      WHERE ac.id = $1
    `;
    
    const result = await pool.query(query, [componentId]);
    
    if (result.rows.length === 0) {
      return res.status(404).json({
        success: false,
        error: 'Asset component not found'
      });
    }
    
    const component = formatComponentData(result.rows[0]);
    
    res.json({
      success: true,
      data: component
    });
  } catch (error) {
    console.error('Error fetching asset component:', error);
    res.status(500).json({ 
      success: false, 
      error: 'Failed to fetch asset component' 
    });
  }
});

/**
 * Create new asset component
 */
router.post('/', async (req, res) => {
  console.log('🚀 Component creation route handler called');
  console.log('🔍 Request headers:', req.headers);
  console.log('🔍 Request user:', req.user);
  
  const client = await pool.connect();
  
  try {
    await client.query('BEGIN');
    
    // Log the entire request body for debugging
    console.log('🔍 Full request body:', JSON.stringify(req.body, null, 2));

    const {
      parent_asset_id,
      component_identifier,
      name,
      description,
      component_type_id,
      model_number,
      serial_number,
      manufacturer,
      acquisition_cost = 0,
      depreciation_method = 'straight_line',
      depreciation_percentage_rate = 0,
      expected_useful_life_months = 36,
      salvage_value = 0,
      status = 'active',
      condition_rating = 'good',
      installation_date,
      acquisition_date,
      warranty_start_date,
      warranty_expiration_date,
      warranty_provider,
      warranty_coverage,
      warranty_notes,
      is_critical = false,
      maintenance_interval_days = 0,
      maintenance_provider,
      maintenance_schedule,
      maintenance_status = 'up_to_date',
      last_maintenance_date,
      next_maintenance_date,
      compliance_status = 'compliant',
      usage_tracking_method,
      expected_total_units = 0,
      notes,
      // Fields that frontend sends but may not exist in database - ignore them
      installation_location, // Not in database schema
      part_number, // Not in database schema  
      operating_hours, // Not in database schema
      cycle_count, // Not in database schema
      performance_rating, // Not in database schema
      efficiency, // Not in database schema
      maintenance_notes // Not in database schema
      // Note: organization_id is deliberately not extracted here as it's derived from parent asset
    } = req.body;
    
    // Validate required fields
    console.log('🔍 Validating required fields:', {
      parent_asset_id: !!parent_asset_id,
      component_identifier: !!component_identifier,
      name: !!name,
      component_type_id: !!component_type_id
    });
    
    if (!parent_asset_id || !component_identifier || !name || !component_type_id) {
      console.log('❌ Required field validation failed');
      return res.status(400).json({
        success: false,
        error: 'Missing required fields: parent_asset_id, component_identifier, name, component_type_id'
      });
    }
    
    console.log('✅ Required field validation passed');
    
    // Check if parent asset exists
    const parentAssetQuery = 'SELECT id FROM assets WHERE id = $1';
    const parentAssetResult = await client.query(parentAssetQuery, [parent_asset_id]);
    
    if (parentAssetResult.rows.length === 0) {
      return res.status(404).json({
        success: false,
        error: 'Parent asset not found'
      });
    }
    
    // Check for duplicate component identifier within the parent asset
    const duplicateQuery = `
      SELECT id FROM asset_components 
      WHERE parent_asset_id = $1 AND component_identifier = $2
    `;
    const duplicateResult = await client.query(duplicateQuery, [parent_asset_id, component_identifier]);
    
    if (duplicateResult.rows.length > 0) {
      return res.status(400).json({
        success: false,
        error: 'Component identifier already exists for this asset'
      });
    }
    
    // Calculate initial net book value
    const net_book_value = acquisition_cost - 0; // No depreciation initially
    
    // Log request data for debugging
    console.log('🔍 Creating component with data:', {
      parent_asset_id,
      component_identifier,
      name,
      description,
      component_type_id,
      model_number,
      serial_number,
      manufacturer,
      acquisition_cost,
      depreciation_method,
      depreciation_percentage_rate,
      expected_useful_life_months,
      salvage_value,
      status,
      condition_rating,
      installation_date,
      acquisition_date,
      warranty_start_date,
      warranty_expiration_date,
      warranty_provider,
      warranty_coverage,
      is_critical,
      maintenance_interval_days,
      maintenance_provider,
      maintenance_schedule,
      compliance_status,
      usage_tracking_method,
      expected_total_units,
      notes
    });

    // Insert new component
    const insertQuery = `
      INSERT INTO asset_components (
        organization_id,
        parent_asset_id,
        component_identifier,
        name,
        description,
        component_type_id,
        component_type,
        model_number,
        serial_number,
        manufacturer,
        acquisition_cost,
        depreciation_method,
        depreciation_percentage_rate,
        expected_useful_life_months,
        salvage_value,
        total_accumulated_depreciation,
        net_book_value,
        status,
        condition_rating,
        installation_date,
        acquisition_date,
        warranty_start_date,
        warranty_expiration_date,
        warranty_provider,
        warranty_coverage,
        warranty_notes,
        is_critical,
        maintenance_interval_days,
        maintenance_provider,
        maintenance_schedule,
        maintenance_status,
        compliance_status,
        usage_tracking_method,
        expected_total_units,
        last_maintenance_date,
        next_maintenance_date,
        notes
      ) VALUES (
        (SELECT organization_id FROM assets WHERE id = $1),
        $1, $2, $3, $4, $5, (SELECT name FROM asset_component_types WHERE id = $5), $6, $7, $8, $9, $10, $11, $12, $13, 0, $14, $15, $16, $17, $18, $19, $20, $21, $22, $23, $24, $25, $26, $27, $28, $29, $30, $31, $32, $33, $34
      ) RETURNING id
    `;
    
    const queryParams = [
      parent_asset_id,        // $1
      component_identifier,   // $2  
      name,                   // $3
      description,            // $4
      component_type_id,      // $5
      model_number,           // $6
      serial_number,          // $7
      manufacturer,           // $8
      acquisition_cost,       // $9
      depreciation_method,    // $10
      depreciation_percentage_rate, // $11
      expected_useful_life_months,  // $12
      salvage_value,          // $13
      net_book_value,         // $14
      status,                 // $15
      condition_rating,       // $16
      installation_date,      // $17
      acquisition_date,       // $18
      warranty_start_date,    // $19
      warranty_expiration_date, // $20
      warranty_provider,      // $21
      warranty_coverage,      // $22
      warranty_notes,         // $23
      is_critical,           // $24
      maintenance_interval_days, // $25
      maintenance_provider,   // $26
      maintenance_schedule,   // $27
      maintenance_status,     // $28
      compliance_status,      // $29
      usage_tracking_method,  // $30
      expected_total_units,   // $31
      last_maintenance_date,  // $32
      next_maintenance_date,  // $33
      notes                   // $34
    ];

    console.log('🔍 SQL parameter count check:', {
      expectedParams: 34,
      actualParams: queryParams.length,
      paramsMatch: queryParams.length === 34
    });
    
    const insertResult = await client.query(insertQuery, queryParams);
    
    const componentId = insertResult.rows[0].id;
    
    await client.query('COMMIT');
    
    // Fetch the created component with full details
    const fetchQuery = `
      SELECT * FROM get_asset_components($1)
      WHERE id = $2
    `;
    
    const fetchResult = await client.query(fetchQuery, [parent_asset_id, componentId]);
    
    const component = formatComponentData(fetchResult.rows[0]);
    
    res.status(201).json({
      success: true,
      data: component,
      message: 'Asset component created successfully'
    });
    
  } catch (error) {
    await client.query('ROLLBACK');
    console.error('🚨 Error creating asset component:', {
      message: error.message,
      stack: error.stack,
      code: error.code,
      detail: error.detail,
      position: error.position,
      internalPosition: error.internalPosition,
      internalQuery: error.internalQuery,
      where: error.where,
      schema: error.schema,
      table: error.table,
      column: error.column,
      dataType: error.dataType,
      constraint: error.constraint
    });
    res.status(500).json({ 
      success: false, 
      error: 'Failed to create asset component',
      details: process.env.NODE_ENV === 'development' ? error.message : undefined
    });
  } finally {
    client.release();
  }
});

/**
 * Update asset component
 */
router.put('/:componentId', async (req, res) => {
  const client = await pool.connect();
  
  try {
    await client.query('BEGIN');
    
    const { componentId } = req.params;
    const updateFields = req.body;
    
    // Remove fields that shouldn't be updated directly
    delete updateFields.id;
    delete updateFields.organization_id;
    delete updateFields.parent_asset_id;
    delete updateFields.total_accumulated_depreciation;
    delete updateFields.date_created;
    
    // Set update timestamp
    updateFields.date_updated = new Date();
    
    // Recalculate net book value if acquisition cost changed
    if (updateFields.acquisition_cost !== undefined) {
      const currentDepreciationQuery = `
        SELECT total_accumulated_depreciation FROM asset_components WHERE id = $1
      `;
      const currentDepreciationResult = await client.query(currentDepreciationQuery, [componentId]);
      
      if (currentDepreciationResult.rows.length > 0) {
        const accumulated = parseFloat(currentDepreciationResult.rows[0].total_accumulated_depreciation) || 0;
        updateFields.net_book_value = parseFloat(updateFields.acquisition_cost) - accumulated;
      }
    }
    
    // Build dynamic update query
    const setClause = Object.keys(updateFields)
      .map((key, index) => `${key} = $${index + 2}`)
      .join(', ');
    
    const updateQuery = `
      UPDATE asset_components 
      SET ${setClause}
      WHERE id = $1
      RETURNING *
    `;
    
    const values = [componentId, ...Object.values(updateFields)];
    const result = await client.query(updateQuery, values);
    
    if (result.rows.length === 0) {
      return res.status(404).json({
        success: false,
        error: 'Asset component not found'
      });
    }
    
    await client.query('COMMIT');
    
    // Fetch updated component with full details
    const fetchQuery = `
      SELECT * FROM get_asset_components($1)
      WHERE id = $2
    `;
    
    const fetchResult = await client.query(fetchQuery, [result.rows[0].parent_asset_id, componentId]);
    
    const component = formatComponentData(fetchResult.rows[0]);
    
    res.json({
      success: true,
      data: component,
      message: 'Asset component updated successfully'
    });
    
  } catch (error) {
    await client.query('ROLLBACK');
    console.error('Error updating asset component:', error);
    res.status(500).json({ 
      success: false, 
      error: 'Failed to update asset component' 
    });
  } finally {
    client.release();
  }
});

/**
 * Delete asset component
 */
router.delete('/:componentId', async (req, res) => {
  const client = await pool.connect();
  
  try {
    await client.query('BEGIN');
    
    const { componentId } = req.params;
    
    // Check if component exists
    const checkQuery = 'SELECT id, name FROM asset_components WHERE id = $1';
    const checkResult = await client.query(checkQuery, [componentId]);
    
    if (checkResult.rows.length === 0) {
      return res.status(404).json({
        success: false,
        error: 'Asset component not found'
      });
    }
    
    const componentName = checkResult.rows[0].name;
    
    // Delete related records (CASCADE should handle this, but being explicit)
    await client.query('DELETE FROM asset_component_depreciation_records WHERE component_id = $1', [componentId]);
    await client.query('DELETE FROM asset_component_maintenance_records WHERE component_id = $1', [componentId]);
    await client.query('DELETE FROM asset_component_usage_records WHERE component_id = $1', [componentId]);
    await client.query('DELETE FROM asset_component_documents WHERE component_id = $1', [componentId]);
    
    // Delete the component
    const deleteQuery = 'DELETE FROM asset_components WHERE id = $1';
    await client.query(deleteQuery, [componentId]);
    
    await client.query('COMMIT');
    
    res.json({
      success: true,
      message: `Asset component "${componentName}" deleted successfully`
    });
    
  } catch (error) {
    await client.query('ROLLBACK');
    console.error('Error deleting asset component:', error);
    res.status(500).json({ 
      success: false, 
      error: 'Failed to delete asset component' 
    });
  } finally {
    client.release();
  }
});

/**
 * Get asset component depreciation records
 */
router.get('/:componentId/depreciation', async (req, res) => {
  try {
    const { componentId } = req.params;
    const limit = parseInt(req.query.limit) || 50;
    
    const query = `
      SELECT 
        acdr.*,
        ac.name as component_name,
        ac.component_identifier,
        a.name as asset_name,
        a.asset_identifier
      FROM asset_component_depreciation_records acdr
      JOIN asset_components ac ON acdr.component_id = ac.id
      JOIN assets a ON acdr.asset_id = a.id
      WHERE acdr.component_id = $1
      ORDER BY acdr.depreciation_date DESC
      LIMIT $2
    `;
    
    const result = await pool.query(query, [componentId, limit]);
    
    res.json({
      success: true,
      data: result.rows,
      total: result.rows.length
    });
    
  } catch (error) {
    console.error('Error fetching component depreciation records:', error);
    res.status(500).json({ 
      success: false, 
      error: 'Failed to fetch depreciation records' 
    });
  }
});

/**
 * Get asset component maintenance records
 */
router.get('/:componentId/maintenance', async (req, res) => {
  try {
    const { componentId } = req.params;
    const limit = parseInt(req.query.limit) || 50;
    
    const query = `
      SELECT 
        acmr.*,
        ac.name as component_name,
        ac.component_identifier,
        a.name as asset_name,
        a.asset_identifier
      FROM asset_component_maintenance_records acmr
      JOIN asset_components ac ON acmr.component_id = ac.id
      JOIN assets a ON acmr.asset_id = a.id
      WHERE acmr.component_id = $1
      ORDER BY acmr.maintenance_date DESC
      LIMIT $2
    `;
    
    const result = await pool.query(query, [componentId, limit]);
    
    res.json({
      success: true,
      data: result.rows,
      total: result.rows.length
    });
    
  } catch (error) {
    console.error('Error fetching component maintenance records:', error);
    res.status(500).json({ 
      success: false, 
      error: 'Failed to fetch maintenance records' 
    });
  }
});

/**
 * Get asset component types
 */
router.get('/types/list', async (req, res) => {
  try {
    const query = `
      SELECT 
        act.*,
        at.name as asset_type_name
      FROM asset_component_types act
      LEFT JOIN asset_types at ON act.asset_type_id = at.id
      WHERE act.is_active = true
      ORDER BY act.name
    `;
    
    const result = await pool.query(query);
    
    res.json({
      success: true,
      data: result.rows,
      total: result.rows.length
    });
    
  } catch (error) {
    console.error('Error fetching component types:', error);
    res.status(500).json({ 
      success: false, 
      error: 'Failed to fetch component types' 
    });
  }
});

module.exports = router;