use crate::db::Collection; // For db.set and db.get_by_id
use crate::db::Db;
use crate::db::hero::OurDB;
use rhai::plugin::*;
use rhai::{Dynamic, Engine, EvalAltResult, INT, Module, Position};
use std::mem;
use std::sync::Arc;

use super::company::{BusinessType, Company, CompanyStatus};
use crate::models::biz::product::{Product, ProductComponent, ProductStatus, ProductType};
use crate::models::biz::sale::{Sale, SaleItem, SaleStatus};
use crate::models::biz::shareholder::{Shareholder, ShareholderType};
use heromodels_core::Model;

type RhaiCompany = Company;
type RhaiShareholder = Shareholder;
type RhaiProduct = Product;
type RhaiProductComponent = ProductComponent;
type RhaiSale = Sale;
type RhaiSaleItem = SaleItem;

// Helper to convert i64 from Rhai to u32 for IDs
fn id_from_i64_to_u32(id_i64: i64) -> Result<u32, Box<EvalAltResult>> {
    u32::try_from(id_i64).map_err(|_| {
        Box::new(EvalAltResult::ErrorArithmetic(
            format!("Failed to convert ID '{}' to u32", id_i64).into(),
            Position::NONE,
        ))
    })
}

#[export_module]
mod rhai_biz_module {
    // --- Company Functions ---
    #[rhai_fn(name = "new_company")]
    pub fn new_company() -> RhaiCompany {
        Company::new()
    }

    // Company builder methods
    #[rhai_fn(name = "name", return_raw, global, pure)]
    pub fn company_name(
        company: &mut RhaiCompany,
        name: String,
    ) -> Result<RhaiCompany, Box<EvalAltResult>> {
        let owned_company = mem::take(company);
        *company = owned_company.name(name);
        Ok(company.clone())
    }

    #[rhai_fn(name = "fiscal_year_end", return_raw, global, pure)]
    pub fn company_fiscal_year_end(
        company: &mut RhaiCompany,
        fiscal_year_end: String,
    ) -> Result<RhaiCompany, Box<EvalAltResult>> {
        let owned_company = mem::take(company);
        *company = owned_company.fiscal_year_end(fiscal_year_end);
        Ok(company.clone())
    }

    #[rhai_fn(name = "registration_number", return_raw, global, pure)]
    pub fn company_registration_number(
        company: &mut RhaiCompany,
        reg_num: String,
    ) -> Result<RhaiCompany, Box<EvalAltResult>> {
        let owned_company = mem::take(company);
        *company = owned_company.registration_number(reg_num);
        Ok(company.clone())
    }

    #[rhai_fn(name = "incorporation_date", return_raw, global, pure)]
    pub fn company_incorporation_date(
        company: &mut RhaiCompany,
        date: i64,
    ) -> Result<RhaiCompany, Box<EvalAltResult>> {
        let owned_company = mem::take(company);
        *company = owned_company.incorporation_date(date);
        Ok(company.clone())
    }

    #[rhai_fn(name = "status", return_raw, global, pure)]
    pub fn company_status(
        company: &mut RhaiCompany,
        status: CompanyStatus,
    ) -> Result<RhaiCompany, Box<EvalAltResult>> {
        let owned_company = mem::take(company);
        *company = owned_company.status(status);
        Ok(company.clone())
    }

    #[rhai_fn(name = "business_type", return_raw, global, pure)]
    pub fn company_business_type(
        company: &mut RhaiCompany,
        business_type: BusinessType,
    ) -> Result<RhaiCompany, Box<EvalAltResult>> {
        let owned_company = mem::take(company);
        *company = owned_company.business_type(business_type);
        Ok(company.clone())
    }

    // Company getters
    #[rhai_fn(name = "get_company_id")]
    pub fn get_company_id(company: &mut RhaiCompany) -> i64 {
        company.get_id() as i64
    }

    #[rhai_fn(name = "get_company_name")]
    pub fn get_company_name(company: &mut RhaiCompany) -> String {
        company.name.clone()
    }

    #[rhai_fn(name = "get_company_created_at")]
    pub fn get_company_created_at(company: &mut RhaiCompany) -> i64 {
        company.base_data.created_at
    }

    #[rhai_fn(name = "get_company_modified_at")]
    pub fn get_company_modified_at(company: &mut RhaiCompany) -> i64 {
        company.base_data.modified_at
    }

    #[rhai_fn(name = "get_company_registration_number")]
    pub fn get_company_registration_number(company: &mut RhaiCompany) -> String {
        company.registration_number.clone()
    }

    #[rhai_fn(name = "get_company_fiscal_year_end")]
    pub fn get_company_fiscal_year_end(company: &mut RhaiCompany) -> String {
        company.fiscal_year_end.clone()
    }

    #[rhai_fn(name = "get_company_incorporation_date")]
    pub fn get_company_incorporation_date(company: &mut RhaiCompany) -> i64 {
        company.incorporation_date
    }

    #[rhai_fn(name = "get_company_status")]
    pub fn get_company_status(company: &mut RhaiCompany) -> CompanyStatus {
        company.status.clone()
    }

    #[rhai_fn(name = "get_company_business_type")]
    pub fn get_company_business_type(company: &mut RhaiCompany) -> BusinessType {
        company.business_type.clone()
    }

    // --- Shareholder Functions ---
    #[rhai_fn(name = "new_shareholder")]
    pub fn new_shareholder() -> RhaiShareholder {
        Shareholder::new()
    }

    // Shareholder builder methods
    #[rhai_fn(name = "name", return_raw, global, pure)]
    pub fn shareholder_name(
        shareholder: &mut RhaiShareholder,
        name: String,
    ) -> Result<RhaiShareholder, Box<EvalAltResult>> {
        let owned_shareholder = mem::take(shareholder);
        *shareholder = owned_shareholder.name(name);
        Ok(shareholder.clone())
    }

    #[rhai_fn(name = "company_id", return_raw, global, pure)]
    pub fn shareholder_company_id(
        shareholder: &mut RhaiShareholder,
        company_id: i64,
    ) -> Result<RhaiShareholder, Box<EvalAltResult>> {
        let company_id_u32 = id_from_i64_to_u32(company_id)?;
        let owned_shareholder = mem::take(shareholder);
        *shareholder = owned_shareholder.company_id(company_id_u32);
        Ok(shareholder.clone())
    }

    #[rhai_fn(name = "share_count", return_raw, global, pure)]
    pub fn shareholder_share_count(
        shareholder: &mut RhaiShareholder,
        share_count: f64,
    ) -> Result<RhaiShareholder, Box<EvalAltResult>> {
        shareholder.shares = share_count;
        Ok(shareholder.clone())
    }

    #[rhai_fn(name = "type_", return_raw, global, pure)]
    pub fn shareholder_type(
        shareholder: &mut RhaiShareholder,
        type_: ShareholderType,
    ) -> Result<RhaiShareholder, Box<EvalAltResult>> {
        let owned_shareholder = mem::take(shareholder);
        *shareholder = owned_shareholder.type_(type_);
        Ok(shareholder.clone())
    }

    // Shareholder getters
    #[rhai_fn(name = "get_shareholder_id")]
    pub fn get_shareholder_id(shareholder: &mut RhaiShareholder) -> i64 {
        shareholder.get_id() as i64
    }

    #[rhai_fn(name = "get_shareholder_name")]
    pub fn get_shareholder_name(shareholder: &mut RhaiShareholder) -> String {
        shareholder.name.clone()
    }

    #[rhai_fn(name = "get_shareholder_company_id")]
    pub fn get_shareholder_company_id(shareholder: &mut RhaiShareholder) -> i64 {
        shareholder.company_id as i64
    }

    #[rhai_fn(name = "get_shareholder_share_count")]
    pub fn get_shareholder_share_count(shareholder: &mut RhaiShareholder) -> i64 {
        shareholder.shares as i64
    }

    #[rhai_fn(name = "get_shareholder_type")]
    pub fn get_shareholder_type(shareholder: &mut RhaiShareholder) -> ShareholderType {
        shareholder.type_.clone()
    }

    // --- ProductComponent Functions ---
    #[rhai_fn(name = "new_product_component")]
    pub fn new_product_component() -> RhaiProductComponent {
        ProductComponent::new()
    }

    // ProductComponent builder methods
    #[rhai_fn(name = "name", return_raw, global, pure)]
    pub fn product_component_name(
        component: &mut RhaiProductComponent,
        name: String,
    ) -> Result<RhaiProductComponent, Box<EvalAltResult>> {
        let owned_component = mem::take(component);
        *component = owned_component.name(name);
        Ok(component.clone())
    }

    #[rhai_fn(name = "description", return_raw, global, pure)]
    pub fn product_component_description(
        component: &mut RhaiProductComponent,
        description: String,
    ) -> Result<RhaiProductComponent, Box<EvalAltResult>> {
        let owned_component = mem::take(component);
        *component = owned_component.description(description);
        Ok(component.clone())
    }

    #[rhai_fn(name = "quantity", return_raw, global, pure)]
    pub fn product_component_quantity(
        component: &mut RhaiProductComponent,
        quantity: i64,
    ) -> Result<RhaiProductComponent, Box<EvalAltResult>> {
        let owned_component = mem::take(component);
        *component = owned_component.quantity(quantity as u32);
        Ok(component.clone())
    }

    // ProductComponent getters
    #[rhai_fn(name = "get_product_component_name")]
    pub fn get_product_component_name(component: &mut RhaiProductComponent) -> String {
        component.name.clone()
    }

    #[rhai_fn(name = "get_product_component_description")]
    pub fn get_product_component_description(component: &mut RhaiProductComponent) -> String {
        component.description.clone()
    }

    #[rhai_fn(name = "get_product_component_quantity")]
    pub fn get_product_component_quantity(component: &mut RhaiProductComponent) -> i64 {
        component.quantity as i64
    }

    // --- Product Functions ---
    #[rhai_fn(name = "new_product")]
    pub fn new_product() -> RhaiProduct {
        Product::new()
    }

    // Product builder methods
    #[rhai_fn(name = "name", return_raw, global, pure)]
    pub fn product_name(
        product: &mut RhaiProduct,
        name: String,
    ) -> Result<RhaiProduct, Box<EvalAltResult>> {
        let owned_product = mem::take(product);
        *product = owned_product.name(name);
        Ok(product.clone())
    }

    #[rhai_fn(name = "description", return_raw, global, pure)]
    pub fn product_description(
        product: &mut RhaiProduct,
        description: String,
    ) -> Result<RhaiProduct, Box<EvalAltResult>> {
        let owned_product = mem::take(product);
        *product = owned_product.description(description);
        Ok(product.clone())
    }

    #[rhai_fn(name = "price", return_raw, global, pure)]
    pub fn product_price(
        product: &mut RhaiProduct,
        price: f64,
    ) -> Result<RhaiProduct, Box<EvalAltResult>> {
        let owned_product = mem::take(product);
        *product = owned_product.price(price);
        Ok(product.clone())
    }

    #[rhai_fn(name = "type_", return_raw, global, pure)]
    pub fn product_type(
        product: &mut RhaiProduct,
        type_: ProductType,
    ) -> Result<RhaiProduct, Box<EvalAltResult>> {
        let owned_product = mem::take(product);
        *product = owned_product.type_(type_);
        Ok(product.clone())
    }

    #[rhai_fn(name = "category", return_raw, global, pure)]
    pub fn product_category(
        product: &mut RhaiProduct,
        category: String,
    ) -> Result<RhaiProduct, Box<EvalAltResult>> {
        let owned_product = mem::take(product);
        *product = owned_product.category(category);
        Ok(product.clone())
    }

    #[rhai_fn(name = "status", return_raw, global, pure)]
    pub fn product_status(
        product: &mut RhaiProduct,
        status: ProductStatus,
    ) -> Result<RhaiProduct, Box<EvalAltResult>> {
        let owned_product = mem::take(product);
        *product = owned_product.status(status);
        Ok(product.clone())
    }

    #[rhai_fn(name = "max_amount", return_raw, global, pure)]
    pub fn product_max_amount(
        product: &mut RhaiProduct,
        max_amount: i64,
    ) -> Result<RhaiProduct, Box<EvalAltResult>> {
        let owned_product = mem::take(product);
        *product = owned_product.max_amount(max_amount as u16);
        Ok(product.clone())
    }

    #[rhai_fn(name = "purchase_till", return_raw, global, pure)]
    pub fn product_purchase_till(
        product: &mut RhaiProduct,
        purchase_till: i64,
    ) -> Result<RhaiProduct, Box<EvalAltResult>> {
        let owned_product = mem::take(product);
        *product = owned_product.purchase_till(purchase_till);
        Ok(product.clone())
    }

    #[rhai_fn(name = "active_till", return_raw, global, pure)]
    pub fn product_active_till(
        product: &mut RhaiProduct,
        active_till: i64,
    ) -> Result<RhaiProduct, Box<EvalAltResult>> {
        let owned_product = mem::take(product);
        *product = owned_product.active_till(active_till);
        Ok(product.clone())
    }

    #[rhai_fn(name = "add_component", return_raw, global, pure)]
    pub fn product_add_component(
        product: &mut RhaiProduct,
        component: RhaiProductComponent,
    ) -> Result<RhaiProduct, Box<EvalAltResult>> {
        let owned_product = mem::take(product);
        *product = owned_product.add_component(component);
        Ok(product.clone())
    }

    #[rhai_fn(name = "components", return_raw, global, pure)]
    pub fn product_components(
        product: &mut RhaiProduct,
        components: Vec<RhaiProductComponent>,
    ) -> Result<RhaiProduct, Box<EvalAltResult>> {
        let owned_product = mem::take(product);
        *product = owned_product.components(components);
        Ok(product.clone())
    }

    // Product getters
    #[rhai_fn(name = "get_product_id")]
    pub fn get_product_id(product: &mut RhaiProduct) -> i64 {
        product.get_id() as i64
    }

    #[rhai_fn(name = "get_product_name")]
    pub fn get_product_name(product: &mut RhaiProduct) -> String {
        product.name.clone()
    }

    #[rhai_fn(name = "get_product_description")]
    pub fn get_product_description(product: &mut RhaiProduct) -> String {
        product.description.clone()
    }

    #[rhai_fn(name = "get_product_price")]
    pub fn get_product_price(product: &mut RhaiProduct) -> f64 {
        product.price
    }

    #[rhai_fn(name = "get_product_type")]
    pub fn get_product_type(product: &mut RhaiProduct) -> ProductType {
        product.type_.clone()
    }

    #[rhai_fn(name = "get_product_category")]
    pub fn get_product_category(product: &mut RhaiProduct) -> String {
        product.category.clone()
    }

    #[rhai_fn(name = "get_product_status")]
    pub fn get_product_status(product: &mut RhaiProduct) -> ProductStatus {
        product.status.clone()
    }

    #[rhai_fn(name = "get_product_max_amount")]
    pub fn get_product_max_amount(product: &mut RhaiProduct) -> i64 {
        product.max_amount as i64
    }

    #[rhai_fn(name = "get_product_purchase_till")]
    pub fn get_product_purchase_till(product: &mut RhaiProduct) -> i64 {
        product.purchase_till
    }

    #[rhai_fn(name = "get_product_active_till")]
    pub fn get_product_active_till(product: &mut RhaiProduct) -> i64 {
        product.active_till
    }

    #[rhai_fn(name = "get_product_components")]
    pub fn get_product_components(product: &mut RhaiProduct) -> Vec<RhaiProductComponent> {
        product.components.clone()
    }

    #[rhai_fn(name = "get_product_created_at")]
    pub fn get_product_created_at(product: &mut RhaiProduct) -> i64 {
        product.base_data.created_at
    }

    #[rhai_fn(name = "get_product_modified_at")]
    pub fn get_product_modified_at(product: &mut RhaiProduct) -> i64 {
        product.base_data.modified_at
    }

    #[rhai_fn(name = "get_product_comments")]
    pub fn get_product_comments(product: &mut RhaiProduct) -> Vec<i64> {
        product
            .base_data
            .comments
            .iter()
            .map(|&id| id as i64)
            .collect()
    }

    // --- SaleItem Functions ---
    #[rhai_fn(name = "new_sale_item")]
    pub fn new_sale_item() -> RhaiSaleItem {
        SaleItem::new()
    }

    // SaleItem builder methods
    #[rhai_fn(name = "name", return_raw, global, pure)]
    pub fn sale_item_name(
        item: &mut RhaiSaleItem,
        name: String,
    ) -> Result<RhaiSaleItem, Box<EvalAltResult>> {
        let owned_item = mem::take(item);
        *item = owned_item.name(name);
        Ok(item.clone())
    }

    #[rhai_fn(name = "price", return_raw, global, pure)]
    pub fn sale_item_price(
        item: &mut RhaiSaleItem,
        price: f64,
    ) -> Result<RhaiSaleItem, Box<EvalAltResult>> {
        item.unit_price = price;
        Ok(item.clone())
    }

    #[rhai_fn(name = "quantity", return_raw, global, pure)]
    pub fn sale_item_quantity(
        item: &mut RhaiSaleItem,
        quantity: i64,
    ) -> Result<RhaiSaleItem, Box<EvalAltResult>> {
        let owned_item = mem::take(item);
        *item = owned_item.quantity(quantity.try_into().unwrap());
        Ok(item.clone())
    }

    #[rhai_fn(name = "product_id", return_raw, global, pure)]
    pub fn sale_item_product_id(
        item: &mut RhaiSaleItem,
        product_id: i64,
    ) -> Result<RhaiSaleItem, Box<EvalAltResult>> {
        let product_id_u32 = id_from_i64_to_u32(product_id)?;
        let owned_item = mem::take(item);
        *item = owned_item.product_id(product_id_u32);
        Ok(item.clone())
    }

    // SaleItem getters
    #[rhai_fn(name = "get_sale_item_name")]
    pub fn get_sale_item_name(item: &mut RhaiSaleItem) -> String {
        item.name.clone()
    }

    #[rhai_fn(name = "get_sale_item_price")]
    pub fn get_sale_item_price(item: &mut RhaiSaleItem) -> f64 {
        item.unit_price
    }

    #[rhai_fn(name = "get_sale_item_quantity")]
    pub fn get_sale_item_quantity(item: &mut RhaiSaleItem) -> i64 {
        item.quantity as i64
    }

    #[rhai_fn(name = "get_sale_item_product_id")]
    pub fn get_sale_item_product_id(item: &mut RhaiSaleItem) -> i64 {
        item.product_id as i64
    }

    // --- Sale Functions ---
    #[rhai_fn(name = "new_sale")]
    pub fn new_sale() -> RhaiSale {
        Sale::new()
    }

    #[rhai_fn(name = "transaction_id", return_raw, global, pure)]
    pub fn sale_transaction_id(
        sale: &mut RhaiSale,
        transaction_id: u32,
    ) -> Result<RhaiSale, Box<EvalAltResult>> {
        sale.transaction_id = transaction_id;
        Ok(sale.clone())
    }

    #[rhai_fn(name = "status", return_raw, global, pure)]
    pub fn sale_status(
        sale: &mut RhaiSale,
        status: SaleStatus,
    ) -> Result<RhaiSale, Box<EvalAltResult>> {
        let owned_sale = mem::take(sale);
        *sale = owned_sale.status(status);
        Ok(sale.clone())
    }

    #[rhai_fn(name = "add_item", return_raw, global, pure)]
    pub fn sale_add_item(
        sale: &mut RhaiSale,
        item: RhaiSaleItem,
    ) -> Result<RhaiSale, Box<EvalAltResult>> {
        let owned_sale = mem::take(sale);
        *sale = owned_sale.add_item(item);
        Ok(sale.clone())
    }

    #[rhai_fn(name = "items", return_raw, global, pure)]
    pub fn sale_items(
        sale: &mut RhaiSale,
        items: Vec<RhaiSaleItem>,
    ) -> Result<RhaiSale, Box<EvalAltResult>> {
        let owned_sale = mem::take(sale);
        *sale = owned_sale.items(items);
        Ok(sale.clone())
    }

    // Sale getters
    #[rhai_fn(name = "get_sale_id")]
    pub fn get_sale_id(sale: &mut RhaiSale) -> i64 {
        sale.get_id() as i64
    }

    #[rhai_fn(name = "get_sale_transaction_id")]
    pub fn get_sale_transaction_id(sale: &mut RhaiSale) -> u32 {
        sale.transaction_id
    }

    #[rhai_fn(name = "get_sale_status")]
    pub fn get_sale_status(sale: &mut RhaiSale) -> SaleStatus {
        sale.status.clone()
    }

    #[rhai_fn(name = "get_sale_items")]
    pub fn get_sale_items(sale: &mut RhaiSale) -> Vec<RhaiSaleItem> {
        sale.items.clone()
    }

    #[rhai_fn(name = "get_sale_created_at")]
    pub fn get_sale_created_at(sale: &mut RhaiSale) -> i64 {
        sale.base_data.created_at
    }

    #[rhai_fn(name = "get_sale_modified_at")]
    pub fn get_sale_modified_at(sale: &mut RhaiSale) -> i64 {
        sale.base_data.modified_at
    }

    #[rhai_fn(name = "get_sale_comments")]
    pub fn get_sale_comments(sale: &mut RhaiSale) -> Vec<i64> {
        sale.base_data
            .comments
            .iter()
            .map(|&id| id as i64)
            .collect()
    }
}

pub fn register_biz_rhai_module(engine: &mut Engine, db: Arc<OurDB>) {
    // Register the exported module globally
    let module = exported_module!(rhai_biz_module);
    engine.register_global_module(module.into());

    // Create a new module for database operations
    let mut db_module = Module::new();

    // Database operations will obtain fresh collection handles directly.

    // Add database functions for Company
    let db_for_set_company = Arc::clone(&db);
    db_module.set_native_fn(
        "set_company",
        move |company: Company| -> Result<INT, Box<EvalAltResult>> {
            let company_collection_set = db_for_set_company
                .collection::<Company>()
                .expect("Failed to get company collection for set in closure");
            company_collection_set
                .set(&company)
                .map(|(id_val, _)| id_val as INT)
                .map_err(|e| {
                    Box::new(EvalAltResult::ErrorRuntime(
                        format!("Failed to save company: {:?}", e).into(),
                        Position::NONE,
                    ))
                })
        },
    );

    let db_for_get_company = Arc::clone(&db);
    db_module.set_native_fn(
        "get_company_by_id",
        move |id: INT| -> Result<Dynamic, Box<EvalAltResult>> {
            let company_collection_get = db_for_get_company
                .collection::<Company>()
                .expect("Failed to get company collection for get in closure");
            let id_u32 = id_from_i64_to_u32(id)?;
            company_collection_get
                .get_by_id(id_u32)
                .map(Dynamic::from)
                .map_err(|e| {
                    Box::new(EvalAltResult::ErrorRuntime(
                        format!("Failed to get company with id {}: {:?}", id, e).into(),
                        Position::NONE,
                    ))
                })
        },
    );

    // Add database functions for Shareholder
    let db_for_set_shareholder = Arc::clone(&db);
    db_module.set_native_fn(
        "set_shareholder",
        move |shareholder: Shareholder| -> Result<INT, Box<EvalAltResult>> {
            let shareholder_collection_set = db_for_set_shareholder
                .collection::<Shareholder>()
                .expect("Failed to get shareholder collection for set in closure");
            shareholder_collection_set
                .set(&shareholder)
                .map(|(id_val, _)| id_val as INT)
                .map_err(|e| {
                    Box::new(EvalAltResult::ErrorRuntime(
                        format!("Failed to save shareholder: {:?}", e).into(),
                        Position::NONE,
                    ))
                })
        },
    );

    let db_for_get_shareholder = Arc::clone(&db);
    db_module.set_native_fn(
        "get_shareholder_by_id",
        move |id: INT| -> Result<Dynamic, Box<EvalAltResult>> {
            let shareholder_collection_get = db_for_get_shareholder
                .collection::<Shareholder>()
                .expect("Failed to get shareholder collection for get in closure");
            let id_u32 = id_from_i64_to_u32(id)?;
            shareholder_collection_get
                .get_by_id(id_u32)
                .map(Dynamic::from)
                .map_err(|e| {
                    Box::new(EvalAltResult::ErrorRuntime(
                        format!("Failed to get shareholder with id {}: {:?}", id, e).into(),
                        Position::NONE,
                    ))
                })
        },
    );

    // Add database functions for Product
    let db_for_set_product = Arc::clone(&db);
    db_module.set_native_fn(
        "set_product",
        move |product: Product| -> Result<INT, Box<EvalAltResult>> {
            let product_collection_set = db_for_set_product
                .collection::<Product>()
                .expect("Failed to get product collection for set in closure");
            product_collection_set
                .set(&product)
                .map(|(id_val, _)| id_val as INT)
                .map_err(|e| {
                    Box::new(EvalAltResult::ErrorRuntime(
                        format!("Failed to save product: {:?}", e).into(),
                        Position::NONE,
                    ))
                })
        },
    );

    let db_for_get_product = Arc::clone(&db);
    db_module.set_native_fn(
        "get_product_by_id",
        move |id: INT| -> Result<Dynamic, Box<EvalAltResult>> {
            let product_collection_get = db_for_get_product
                .collection::<Product>()
                .expect("Failed to get product collection for get in closure");
            let id_u32 = id_from_i64_to_u32(id)?;
            product_collection_get
                .get_by_id(id_u32)
                .map(Dynamic::from)
                .map_err(|e| {
                    Box::new(EvalAltResult::ErrorRuntime(
                        format!("Failed to get product with id {}: {:?}", id, e).into(),
                        Position::NONE,
                    ))
                })
        },
    );

    // Add database functions for Sale
    let db_for_set_sale = Arc::clone(&db);
    db_module.set_native_fn(
        "set_sale",
        move |sale: Sale| -> Result<INT, Box<EvalAltResult>> {
            let sale_collection_set = db_for_set_sale
                .collection::<Sale>()
                .expect("Failed to get sale collection for set in closure");
            sale_collection_set
                .set(&sale)
                .map(|(id_val, _)| id_val as INT)
                .map_err(|e| {
                    Box::new(EvalAltResult::ErrorRuntime(
                        format!("Failed to save sale: {:?}", e).into(),
                        Position::NONE,
                    ))
                })
        },
    );

    let db_for_get_sale = Arc::clone(&db);
    db_module.set_native_fn(
        "get_sale_by_id",
        move |id: INT| -> Result<Dynamic, Box<EvalAltResult>> {
            let sale_collection_get = db_for_get_sale
                .collection::<Sale>()
                .expect("Failed to get sale collection for get in closure");
            let id_u32 = id_from_i64_to_u32(id)?;
            sale_collection_get
                .get_by_id(id_u32)
                .map(Dynamic::from)
                .map_err(|e| {
                    Box::new(EvalAltResult::ErrorRuntime(
                        format!("Failed to get sale with id {}: {:?}", id, e).into(),
                        Position::NONE,
                    ))
                })
        },
    );

    // Register the database module globally
    engine.register_global_module(db_module.into());

    println!("Successfully registered biz Rhai module using export_module approach.");
}