import 'package:flutter/material.dart';

enum MasterFieldType { text, number, boolean, dropdown }

const brandTypes = ['OWN', 'OEM', 'THIRD_PARTY'];

class MasterFieldDef {
  const MasterFieldDef({
    required this.key,
    required this.label,
    this.type = MasterFieldType.text,
    this.required = false,
    this.showInList = false,
    this.optionsMasterKey,
    this.staticOptions,
    this.multiline = false,
  });

  final String key;
  final String label;
  final MasterFieldType type;
  final bool required;
  final bool showInList;
  /// Master key used to populate dropdown options (e.g. `plants` for plant_id).
  final String? optionsMasterKey;
  /// Fixed dropdown choices (e.g. brand type) — no API lookup.
  final List<String>? staticOptions;
  final bool multiline;
}

class MasterDefinition {
  const MasterDefinition({
    required this.id,
    required this.title,
    required this.subtitle,
    required this.category,
    required this.routeKey,
    required this.apiPath,
    required this.module,
    required this.icon,
    required this.fields,
  });

  final String id;
  final String title;
  final String subtitle;
  final String category;
  final String routeKey;
  final String apiPath;
  final String module;
  final IconData icon;
  final List<MasterFieldDef> fields;

  List<MasterFieldDef> get listFields =>
      fields.where((field) => field.showInList).toList();

  List<MasterFieldDef> get formFields => fields;

  String listRoute(String base) => '$base/$routeKey';
  String addRoute(String base) => '$base/$routeKey/add';
  String editRoute(String base, String id) => '$base/$routeKey/$id/edit';
}

const _activeField = MasterFieldDef(
  key: 'is_active',
  label: 'Active',
  type: MasterFieldType.boolean,
);

MasterDefinition? masterDefinitionById(String id) {
  for (final def in masterDefinitions) {
    if (def.id == id) return def;
  }
  return null;
}

MasterDefinition? masterDefinitionByRouteKey(String routeKey) {
  for (final def in masterDefinitions) {
    if (def.routeKey == routeKey) return def;
  }
  return null;
}

const masterDefinitions = <MasterDefinition>[
  MasterDefinition(
    id: 'uom',
    title: 'UOM',
    subtitle: 'Units of measure',
    category: 'Inventory & Items',
    routeKey: 'uom',
    apiPath: '/masters/uom',
    module: 'uom',
    icon: Icons.straighten_outlined,
    fields: [
      MasterFieldDef(key: 'code', label: 'Code', required: true, showInList: true),
      MasterFieldDef(key: 'name', label: 'Name', required: true, showInList: true),
      _activeField,
    ],
  ),
  MasterDefinition(
    id: 'item_categories',
    title: 'Item Categories',
    subtitle: 'Top-level item grouping',
    category: 'Inventory & Items',
    routeKey: 'item-categories',
    apiPath: '/masters/item-categories',
    module: 'item_categories',
    icon: Icons.category_outlined,
    fields: [
      MasterFieldDef(key: 'code', label: 'Code', required: true, showInList: true),
      MasterFieldDef(key: 'name', label: 'Name', required: true, showInList: true),
      _activeField,
    ],
  ),
  MasterDefinition(
    id: 'item_subcategories',
    title: 'Item Sub Categories',
    subtitle: 'Sub-grouping under item categories',
    category: 'Inventory & Items',
    routeKey: 'item-subcategories',
    apiPath: '/masters/item-subcategories',
    module: 'item_subcategories',
    icon: Icons.subdirectory_arrow_right,
    fields: [
      MasterFieldDef(
        key: 'item_category_id',
        label: 'Item Category',
        type: MasterFieldType.dropdown,
        required: true,
        showInList: true,
        optionsMasterKey: 'item_categories',
      ),
      MasterFieldDef(key: 'code', label: 'Code', required: true, showInList: true),
      MasterFieldDef(key: 'name', label: 'Name', required: true, showInList: true),
      _activeField,
    ],
  ),
  MasterDefinition(
    id: 'items',
    title: 'Items',
    subtitle: 'Material and product master',
    category: 'Inventory & Items',
    routeKey: 'items',
    apiPath: '/masters/items',
    module: 'items',
    icon: Icons.inventory_outlined,
    fields: [
      MasterFieldDef(key: 'item_code', label: 'Item Code', required: true, showInList: true),
      MasterFieldDef(key: 'item_name', label: 'Item Name', required: true, showInList: true),
      MasterFieldDef(
        key: 'item_category_id',
        label: 'Category',
        type: MasterFieldType.dropdown,
        required: true,
        optionsMasterKey: 'item_categories',
      ),
      MasterFieldDef(
        key: 'item_subcategory_id',
        label: 'Sub Category',
        type: MasterFieldType.dropdown,
        optionsMasterKey: 'item_subcategories',
      ),
      MasterFieldDef(
        key: 'uom_id',
        label: 'UOM',
        type: MasterFieldType.dropdown,
        required: true,
        optionsMasterKey: 'uom',
      ),
      MasterFieldDef(
        key: 'gst_rate_id',
        label: 'GST Rate',
        type: MasterFieldType.dropdown,
        optionsMasterKey: 'gst_rates',
      ),
      MasterFieldDef(
        key: 'brand_id',
        label: 'Brand',
        type: MasterFieldType.dropdown,
        optionsMasterKey: 'brands',
      ),
      MasterFieldDef(
        key: 'is_asset_item',
        label: 'Asset Item',
        type: MasterFieldType.boolean,
        required: true,
      ),
      MasterFieldDef(
        key: 'min_order_qty',
        label: 'Min Order Qty',
        type: MasterFieldType.number,
        required: true,
      ),
      MasterFieldDef(
        key: 'reorder_level',
        label: 'Reorder Level',
        type: MasterFieldType.number,
        required: true,
      ),
      MasterFieldDef(key: 'description', label: 'Description', multiline: true),
      MasterFieldDef(key: 'specification', label: 'Specification', multiline: true),
      _activeField,
    ],
  ),
  MasterDefinition(
    id: 'brands',
    title: 'Brands',
    subtitle: 'Own and third-party brands',
    category: 'Inventory & Items',
    routeKey: 'brands',
    apiPath: '/masters/brands',
    module: 'brands',
    icon: Icons.loyalty_outlined,
    fields: [
      MasterFieldDef(key: 'code', label: 'Code', required: true, showInList: true),
      MasterFieldDef(key: 'name', label: 'Name', required: true, showInList: true),
      MasterFieldDef(
        key: 'brand_type',
        label: 'Brand Type',
        type: MasterFieldType.dropdown,
        required: true,
        showInList: true,
        staticOptions: brandTypes,
      ),
      MasterFieldDef(key: 'contact_person', label: 'Contact Person'),
      MasterFieldDef(key: 'phone', label: 'Phone'),
      MasterFieldDef(key: 'email', label: 'Email'),
      _activeField,
    ],
  ),
  MasterDefinition(
    id: 'document_series',
    title: 'Document Series',
    subtitle: 'Numbering series for documents',
    category: 'Finance & Terms',
    routeKey: 'document-series',
    apiPath: '/masters/document-series',
    module: 'document_series',
    icon: Icons.numbers_outlined,
    fields: [
      MasterFieldDef(key: 'code', label: 'Code', required: true, showInList: true),
      MasterFieldDef(key: 'prefix', label: 'Prefix', required: true, showInList: true),
      MasterFieldDef(
        key: 'current_number',
        label: 'Current Number',
        type: MasterFieldType.number,
        required: true,
        showInList: true,
      ),
      MasterFieldDef(
        key: 'padding',
        label: 'Padding',
        type: MasterFieldType.number,
        required: true,
      ),
      MasterFieldDef(key: 'description', label: 'Description', multiline: true),
      _activeField,
    ],
  ),
  MasterDefinition(
    id: 'plants',
    title: 'Plants',
    subtitle: 'Manufacturing plants and units',
    category: 'Organization',
    routeKey: 'plants',
    apiPath: '/masters/plants',
    module: 'plants',
    icon: Icons.factory_outlined,
    fields: [
      MasterFieldDef(key: 'code', label: 'Code', required: true, showInList: true),
      MasterFieldDef(key: 'name', label: 'Name', required: true, showInList: true),
      MasterFieldDef(key: 'gstin', label: 'GSTIN', showInList: true),
      MasterFieldDef(key: 'city', label: 'City', showInList: true),
      MasterFieldDef(key: 'state', label: 'State'),
      MasterFieldDef(key: 'address', label: 'Address', multiline: true),
      MasterFieldDef(key: 'pincode', label: 'Pincode'),
      MasterFieldDef(key: 'phone', label: 'Phone'),
      _activeField,
    ],
  ),
  MasterDefinition(
    id: 'warehouses',
    title: 'Warehouse',
    subtitle: 'Storage locations by plant',
    category: 'Organization',
    routeKey: 'warehouses',
    apiPath: '/masters/warehouses',
    module: 'warehouses',
    icon: Icons.warehouse_outlined,
    fields: [
      MasterFieldDef(key: 'code', label: 'Code', required: true, showInList: true),
      MasterFieldDef(key: 'name', label: 'Name', required: true, showInList: true),
      MasterFieldDef(
        key: 'plant_id',
        label: 'Plant',
        type: MasterFieldType.dropdown,
        required: true,
        showInList: true,
        optionsMasterKey: 'plants',
      ),
      MasterFieldDef(key: 'location', label: 'Location'),
      _activeField,
    ],
  ),
  MasterDefinition(
    id: 'designations',
    title: 'Designations',
    subtitle: 'Employee designations',
    category: 'Organization',
    routeKey: 'designations',
    apiPath: '/masters/designations',
    module: 'designations',
    icon: Icons.badge_outlined,
    fields: [
      MasterFieldDef(key: 'name', label: 'Name', required: true, showInList: true),
      _activeField,
    ],
  ),
  MasterDefinition(
    id: 'departments',
    title: 'Departments',
    subtitle: 'Organisation departments',
    category: 'Organization',
    routeKey: 'departments',
    apiPath: '/masters/departments',
    module: 'departments',
    icon: Icons.apartment_outlined,
    fields: [
      MasterFieldDef(key: 'name', label: 'Name', required: true, showInList: true),
      _activeField,
    ],
  ),
  MasterDefinition(
    id: 'asset_categories',
    title: 'Asset Categories',
    subtitle: 'Fixed asset classification',
    category: 'Assets',
    routeKey: 'asset-categories',
    apiPath: '/masters/asset-categories',
    module: 'asset_categories',
    icon: Icons.precision_manufacturing_outlined,
    fields: [
      MasterFieldDef(key: 'code', label: 'Code', required: true, showInList: true),
      MasterFieldDef(key: 'name', label: 'Name', required: true, showInList: true),
      MasterFieldDef(key: 'code_prefix', label: 'Code Prefix', required: true, showInList: true),
      MasterFieldDef(
        key: 'default_useful_life_years',
        label: 'Useful Life (Years)',
        type: MasterFieldType.number,
        required: true,
      ),
      MasterFieldDef(
        key: 'default_depreciation_method',
        label: 'Depreciation Method',
        type: MasterFieldType.dropdown,
        required: true,
        showInList: true,
        optionsMasterKey: 'asset_depreciation_methods',
      ),
      _activeField,
    ],
  ),
  MasterDefinition(
    id: 'asset_subcategories',
    title: 'Asset Subcategories',
    subtitle: 'Sub-classification under asset categories',
    category: 'Assets',
    routeKey: 'asset-subcategories',
    apiPath: '/masters/asset-subcategories',
    module: 'asset_subcategories',
    icon: Icons.category_outlined,
    fields: [
      MasterFieldDef(
        key: 'asset_category_id',
        label: 'Asset Category',
        type: MasterFieldType.dropdown,
        required: true,
        showInList: true,
        optionsMasterKey: 'asset_categories',
      ),
      MasterFieldDef(key: 'code', label: 'Code', required: true, showInList: true),
      MasterFieldDef(key: 'name', label: 'Name', required: true, showInList: true),
      _activeField,
    ],
  ),
  MasterDefinition(
    id: 'delivery_terms',
    title: 'Delivery Terms',
    subtitle: 'Delivery incoterms and terms',
    category: 'Finance & Terms',
    routeKey: 'delivery-terms',
    apiPath: '/masters/delivery-terms',
    module: 'delivery_terms',
    icon: Icons.local_shipping_outlined,
    fields: [
      MasterFieldDef(key: 'code', label: 'Code', required: true, showInList: true),
      MasterFieldDef(key: 'name', label: 'Name', required: true, showInList: true),
      MasterFieldDef(key: 'description', label: 'Description', multiline: true),
      _activeField,
    ],
  ),
  MasterDefinition(
    id: 'payment_terms',
    title: 'Payment Terms',
    subtitle: 'Vendor payment terms',
    category: 'Finance & Terms',
    routeKey: 'payment-terms',
    apiPath: '/masters/payment-terms',
    module: 'payment_terms',
    icon: Icons.payments_outlined,
    fields: [
      MasterFieldDef(key: 'code', label: 'Code', required: true, showInList: true),
      MasterFieldDef(key: 'name', label: 'Name', required: true, showInList: true),
      MasterFieldDef(
        key: 'credit_days',
        label: 'Credit Days',
        type: MasterFieldType.number,
        required: true,
        showInList: true,
      ),
      MasterFieldDef(key: 'description', label: 'Description', multiline: true),
      _activeField,
    ],
  ),
  MasterDefinition(
    id: 'gst_rates',
    title: 'GST Rates',
    subtitle: 'Tax rate master',
    category: 'Finance & Terms',
    routeKey: 'gst-rates',
    apiPath: '/masters/gst-rates',
    module: 'gst_rates',
    icon: Icons.percent_outlined,
    fields: [
      MasterFieldDef(
        key: 'rate_pct',
        label: 'Rate (%)',
        type: MasterFieldType.number,
        required: true,
        showInList: true,
      ),
      MasterFieldDef(key: 'description', label: 'Description', showInList: true),
      _activeField,
    ],
  ),
];

List<String> get masterCategories =>
    masterDefinitions.map((def) => def.category).toSet().toList();

String masterRecordLabel(Map<String, dynamic> row) {
  final ratePct = row['rate_pct'];
  if (ratePct != null) {
    final rate = ratePct is num
        ? ratePct.toDouble()
        : double.tryParse(ratePct.toString());
    if (rate != null) {
      return rate % 1 == 0 ? '${rate.toInt()}%' : '$rate%';
    }
  }

  for (final key in ['name', 'item_name', 'code', 'item_code', 'description']) {
    final value = row[key];
    if (value != null && value.toString().trim().isNotEmpty) {
      return value.toString();
    }
  }
  return row['id']?.toString() ?? 'Record';
}

String masterCellValue(Map<String, dynamic> row, MasterFieldDef field) {
  final value = row[field.key];
  if (value == null || value == '') return '—';

  if (field.type == MasterFieldType.boolean) {
    return value == true ? 'Yes' : 'No';
  }

  if (field.type == MasterFieldType.dropdown) {
    final label = row['${field.key}_label'];
    if (label != null && label.toString().isNotEmpty) return label.toString();
    if (field.staticOptions != null) {
      return value.toString().replaceAll('_', ' ');
    }
  }

  return value.toString();
}

String masterStatusValue(Map<String, dynamic> row) {
  final active = row['is_active'];
  if (active == false) return 'inactive';
  return 'active';
}