// SPDX-FileCopyrightText: 2024 Aravinth Manivannan <realaravinth@batsense.net>
//
// SPDX-License-Identifier: AGPL-3.0-or-later

use std::collections::HashSet;

use derive_builder::Builder;
use derive_getters::Getters;
use derive_more::{Display, Error};
use serde::{Deserialize, Serialize};
use uuid::Uuid;

use super::product_aggregate::{Price, Quantity};

#[derive(Debug, Error, Display, Clone, Serialize, Deserialize, PartialEq, Eq, PartialOrd, Ord)]
pub enum AddProductCommandError {
    NameIsEmpty,
    CustomizationNameIsEmpty,
    DuplicateCustomizationName,
}
#[derive(
    Clone, Debug, Serialize, Deserialize, Eq, PartialEq, Ord, PartialOrd, Getters, Builder,
)]
pub struct UnvalidatedAddCustomization {
    name: String,
}

#[derive(Clone, Debug, Serialize, Deserialize, Eq, PartialEq, Ord, PartialOrd, Getters)]
pub struct AddCustomization {
    name: String,
}

impl UnvalidatedAddCustomization {
    pub fn validate(self) -> Result<AddCustomization, AddProductCommandError> {
        let name = self.name.trim().to_owned();
        if name.is_empty() {
            return Err(AddProductCommandError::CustomizationNameIsEmpty);
        }

        Ok(AddCustomization { name })
    }
}

#[derive(
    Clone, Debug, Serialize, Deserialize, Eq, PartialEq, Ord, PartialOrd, Getters, Builder,
)]
pub struct UnvalidatedAddProductCommand {
    name: String,
    description: Option<String>,
    image: Option<String>,
    category_id: Uuid,
    sku_able: bool,
    quantity: Quantity,
    price: Price,
    adding_by: Uuid,
    customizations: Vec<AddCustomization>,
}

#[derive(Clone, Debug, Serialize, Deserialize, Eq, PartialEq, Ord, PartialOrd, Getters)]
pub struct AddProductCommand {
    name: String,
    description: Option<String>,
    image: Option<String>,
    category_id: Uuid,
    sku_able: bool,
    price: Price,
    quantity: Quantity,
    adding_by: Uuid,
    customizations: Vec<AddCustomization>,
}

impl UnvalidatedAddProductCommand {
    pub fn validate(self) -> Result<AddProductCommand, AddProductCommandError> {
        let description: Option<String> = if let Some(description) = self.description {
            let description = description.trim();
            if description.is_empty() {
                None
            } else {
                Some(description.to_owned())
            }
        } else {
            None
        };

        let image: Option<String> = if let Some(image) = self.image {
            let image = image.trim();
            if image.is_empty() {
                None
            } else {
                Some(image.to_owned())
            }
        } else {
            None
        };

        let name = self.name.trim().to_owned();
        if name.is_empty() {
            return Err(AddProductCommandError::NameIsEmpty);
        }

        let mut unique_customization_names = HashSet::new();
        if !self
            .customizations
            .iter()
            .all(|c| unique_customization_names.insert(c.name.clone()))
        {
            return Err(AddProductCommandError::DuplicateCustomizationName);
        }

        Ok(AddProductCommand {
            name,
            description,
            image,
            category_id: self.category_id,
            sku_able: self.sku_able,
            price: self.price,
            quantity: self.quantity,
            adding_by: self.adding_by,
            customizations: self.customizations,
        })
    }
}

#[cfg(test)]
pub mod tests {
    use super::*;

    use crate::{
        inventory::domain::product_aggregate::{
            Currency, PriceBuilder, QuantityBuilder, QuantityUnit,
        },
        utils::uuid::tests::UUID,
    };

    pub fn get_customizations() -> Vec<AddCustomization> {
        vec![
            UnvalidatedAddCustomizationBuilder::default()
                .name("foo".into())
                .build()
                .unwrap()
                .validate()
                .unwrap(),
            UnvalidatedAddCustomizationBuilder::default()
                .name("bar".into())
                .build()
                .unwrap()
                .validate()
                .unwrap(),
            UnvalidatedAddCustomizationBuilder::default()
                .name("baz".into())
                .build()
                .unwrap()
                .validate()
                .unwrap(),
        ]
    }
    pub fn get_command() -> AddProductCommand {
        let name = "foo";
        let adding_by = UUID;
        let category_id = Uuid::new_v4();
        let sku_able = false;
        let image = Some("image".to_string());
        let description = Some("description".to_string());

        let customizations = get_customizations();

        let price = PriceBuilder::default()
            .minor(0)
            .major(100)
            .currency(Currency::INR)
            .build()
            .unwrap();

        let quantity = QuantityBuilder::default()
            .number(1)
            .unit(QuantityUnit::DiscreteNumber)
            .build()
            .unwrap();

        let cmd = UnvalidatedAddProductCommandBuilder::default()
            .name(name.into())
            .description(description.clone())
            .image(image.clone())
            .category_id(category_id.clone())
            .adding_by(adding_by.clone())
            .quantity(quantity)
            .sku_able(sku_able)
            .price(price.clone())
            .customizations(customizations)
            .build()
            .unwrap();

        cmd.validate().unwrap()
    }

    #[test]
    fn test_description_and_image_none() {
        let name = "foo";
        let adding_by = UUID;
        let category_id = Uuid::new_v4();
        let sku_able = false;

        let customizations = get_customizations();
        let price = PriceBuilder::default()
            .minor(0)
            .major(100)
            .currency(Currency::INR)
            .build()
            .unwrap();
        let quantity = QuantityBuilder::default()
            .number(1)
            .unit(QuantityUnit::DiscreteNumber)
            .build()
            .unwrap();

        // description = None
        let cmd = UnvalidatedAddProductCommandBuilder::default()
            .name(name.into())
            .description(None)
            .image(None)
            .category_id(category_id.clone())
            .adding_by(adding_by.clone())
            .quantity(quantity.clone())
            .sku_able(sku_able)
            .price(price.clone())
            .customizations(customizations.clone())
            .build()
            .unwrap();

        let cmd = cmd.validate().unwrap();

        assert_eq!(cmd.name(), name);
        assert_eq!(cmd.description(), &None);
        assert_eq!(cmd.adding_by(), &adding_by);
        assert_eq!(cmd.category_id(), &category_id);
        assert_eq!(cmd.image(), &None);
        assert_eq!(cmd.sku_able(), &sku_able);
        assert_eq!(cmd.price(), &price);
        assert_eq!(cmd.quantity(), &quantity);
        assert_eq!(cmd.customizations(), &customizations);
    }
    #[test]
    fn test_description_some() {
        let name = "foo";
        let adding_by = UUID;
        let category_id = Uuid::new_v4();
        let sku_able = false;
        let image = Some("image".to_string());
        let description = Some("description".to_string());

        let customizations = get_customizations();
        let price = PriceBuilder::default()
            .minor(0)
            .major(100)
            .currency(Currency::INR)
            .build()
            .unwrap();
        let quantity = QuantityBuilder::default()
            .number(1)
            .unit(QuantityUnit::DiscreteNumber)
            .build()
            .unwrap();

        let cmd = UnvalidatedAddProductCommandBuilder::default()
            .name(name.into())
            .description(description.clone())
            .image(image.clone())
            .category_id(category_id.clone())
            .quantity(quantity.clone())
            .adding_by(adding_by.clone())
            .sku_able(sku_able)
            .price(price.clone())
            .customizations(customizations.clone())
            .build()
            .unwrap();

        let cmd = cmd.validate().unwrap();

        assert_eq!(cmd.name(), name);
        assert_eq!(cmd.description(), &description);
        assert_eq!(cmd.adding_by(), &adding_by);
        assert_eq!(cmd.category_id(), &category_id);
        assert_eq!(cmd.image(), &image);
        assert_eq!(cmd.sku_able(), &sku_able);
        assert_eq!(cmd.price(), &price);
        assert_eq!(cmd.quantity(), &quantity);
        assert_eq!(cmd.customizations(), &customizations);
    }

    #[test]
    fn test_name_is_empty() {
        let adding_by = UUID;
        let category_id = Uuid::new_v4();
        let sku_able = false;
        let image = Some("image".to_string());
        let description = Some("description".to_string());

        let customizations = get_customizations();
        let price = PriceBuilder::default()
            .minor(0)
            .major(100)
            .currency(Currency::INR)
            .build()
            .unwrap();
        let quantity = QuantityBuilder::default()
            .number(1)
            .unit(QuantityUnit::DiscreteNumber)
            .build()
            .unwrap();

        let cmd = UnvalidatedAddProductCommandBuilder::default()
            .name("".into())
            .description(description.clone())
            .image(image.clone())
            .category_id(category_id.clone())
            .adding_by(adding_by.clone())
            .quantity(quantity)
            .sku_able(sku_able)
            .customizations(customizations)
            .price(price.clone())
            .build()
            .unwrap();

        // AddProductCommandError::NameIsEmpty
        assert_eq!(cmd.validate(), Err(AddProductCommandError::NameIsEmpty))
    }

    #[test]
    fn test_customization_name_is_empty() {
        assert_eq!(
            UnvalidatedAddCustomizationBuilder::default()
                .name("".into())
                .build()
                .unwrap()
                .validate(),
            Err(AddProductCommandError::CustomizationNameIsEmpty)
        )
    }

    #[test]
    fn test_duplicate_customization() {
        let name = "foo";
        let adding_by = UUID;
        let category_id = Uuid::new_v4();
        let sku_able = false;
        let image = Some("image".to_string());
        let description = Some("description".to_string());

        let mut customizations = get_customizations();
        customizations.push(customizations.first().unwrap().to_owned());

        let price = PriceBuilder::default()
            .minor(0)
            .major(100)
            .currency(Currency::INR)
            .build()
            .unwrap();
        let quantity = QuantityBuilder::default()
            .number(1)
            .unit(QuantityUnit::DiscreteNumber)
            .build()
            .unwrap();

        let cmd = UnvalidatedAddProductCommandBuilder::default()
            .name(name.into())
            .description(description.clone())
            .image(image.clone())
            .category_id(category_id.clone())
            .adding_by(adding_by.clone())
            .quantity(quantity)
            .sku_able(sku_able)
            .customizations(customizations)
            .price(price.clone())
            .build()
            .unwrap();

        // AddProductCommandError::DuplicateCustomizationName
        assert_eq!(
            cmd.validate(),
            Err(AddProductCommandError::DuplicateCustomizationName)
        )
    }
}