use crate::domain::error::{AppError, AppResult};
use crate::domain::models::{OrderRecord, ProductLink};
use crate::infrastructure::db::DbPool;
use crate::infrastructure::repositories::{OrderRepository, ProductRepository};
use async_trait::async_trait;
use std::sync::Arc;

#[async_trait]
pub trait CheckoutService: Send + Sync {
    async fn get_checkout_view(&self, link_id: &str) -> AppResult<ProductLink>;
    #[allow(clippy::too_many_arguments)]
    async fn execute_checkout(
        &self,
        link_id: &str,
        buyer_phone: &str,
        buyer_name: &str,
        buyer_email: &str,
        shipping_pincode: &str,
        delivery_address: &str,
        coupon_code: Option<String>,
        request_id: Option<String>,
        client_ip: &str,
        lat: Option<f64>,
        lng: Option<f64>,
        device_fingerprint: Option<String>,
    ) -> AppResult<OrderRecord>;
    #[allow(clippy::too_many_arguments)]
    async fn execute_cart_checkout(
        &self,
        items: Vec<(String, u32)>, // (link_id, quantity)
        buyer_phone: &str,
        buyer_name: &str,
        buyer_email: &str,
        shipping_pincode: &str,
        delivery_address: &str,
        coupon_code: Option<String>,
        request_id: Option<String>,
        client_ip: &str,
        lat: Option<f64>,
        lng: Option<f64>,
        device_fingerprint: Option<String>,
    ) -> AppResult<OrderRecord>;
    async fn submit_delivery_proof(
        &self,
        transaction_id: &str,
        proof_data: &str,
        proof_token: &str,
        lat: Option<f64>,
        lng: Option<f64>,
    ) -> AppResult<()>;
    async fn estimate_delivery(
        &self,
        link_id: &str,
        pincode: &str,
        _buyer_phone: Option<String>,
    ) -> AppResult<(f64, f64)>;
}

pub struct RtixCheckoutService {
    product_repo: Arc<dyn ProductRepository>,
    merchant_repo: Arc<dyn crate::infrastructure::repositories::MerchantRepository>,
    order_repo: Arc<dyn OrderRepository>,
    assets: Arc<dyn crate::infrastructure::storage::assets::AssetProvider>,
    tx: tokio::sync::broadcast::Sender<crate::interfaces::http::api::RealtimeEvent>,
    pool: DbPool,
}

impl RtixCheckoutService {
    pub fn new(
        product_repo: Arc<dyn ProductRepository>,
        merchant_repo: Arc<dyn crate::infrastructure::repositories::MerchantRepository>,
        order_repo: Arc<dyn OrderRepository>,
        assets: Arc<dyn crate::infrastructure::storage::assets::AssetProvider>,
        tx: tokio::sync::broadcast::Sender<crate::interfaces::http::api::RealtimeEvent>,
        pool: DbPool,
    ) -> Self {
        Self {
            product_repo,
            merchant_repo,
            order_repo,
            assets,
            tx,
            pool,
        }
    }
}

#[async_trait]
impl CheckoutService for RtixCheckoutService {
    async fn get_checkout_view(&self, link_id: &str) -> AppResult<ProductLink> {
        let product = self.product_repo.find_by_id(link_id).await?;
        let mut product =
            product.ok_or_else(|| AppError::NotFound("Product link not found".to_string()))?;

        let _ = self.product_repo.increment_views(link_id).await;
        product.image_data = crate::core::utils::hydrate_file_to_base64(product.image_data).await;

        Ok(product)
    }

    #[allow(clippy::too_many_arguments)]
    async fn execute_checkout(
        &self,
        link_id: &str,
        buyer_phone: &str,
        buyer_name: &str,
        buyer_email: &str,
        shipping_pincode: &str,
        delivery_address: &str,
        coupon_code: Option<String>,
        request_id: Option<String>,
        client_ip: &str,
        lat: Option<f64>,
        lng: Option<f64>,
        device_fingerprint: Option<String>,
    ) -> AppResult<OrderRecord> {
        crate::application::services::checkout_impl::execute_checkout_helper(
            &self.product_repo,
            &self.merchant_repo,
            &self.order_repo,
            &self.pool,
            &self.tx,
            link_id,
            buyer_phone,
            buyer_name,
            buyer_email,
            shipping_pincode,
            delivery_address,
            coupon_code,
            request_id,
            client_ip,
            lat,
            lng,
            device_fingerprint,
        )
        .await
    }

    #[allow(clippy::too_many_arguments)]
    async fn execute_cart_checkout(
        &self,
        items: Vec<(String, u32)>,
        buyer_phone: &str,
        buyer_name: &str,
        buyer_email: &str,
        shipping_pincode: &str,
        delivery_address: &str,
        coupon_code: Option<String>,
        request_id: Option<String>,
        client_ip: &str,
        lat: Option<f64>,
        lng: Option<f64>,
        device_fingerprint: Option<String>,
    ) -> AppResult<OrderRecord> {
        crate::application::services::checkout_impl::execute_cart_checkout_helper(
            &self.product_repo,
            &self.merchant_repo,
            &self.order_repo,
            &self.pool,
            &self.tx,
            items,
            buyer_phone,
            buyer_name,
            buyer_email,
            shipping_pincode,
            delivery_address,
            coupon_code,
            request_id,
            client_ip,
            lat,
            lng,
            device_fingerprint,
        )
        .await
    }

    async fn submit_delivery_proof(
        &self,
        transaction_id: &str,
        proof_data: &str,
        proof_token: &str,
        lat: Option<f64>,
        lng: Option<f64>,
    ) -> AppResult<()> {
        crate::application::services::checkout_impl::execute_submit_delivery_proof_helper(
            &self.order_repo,
            &self.assets,
            &self.tx,
            transaction_id,
            proof_data,
            proof_token,
            lat,
            lng,
        )
        .await
    }

    async fn estimate_delivery(
        &self,
        link_id: &str,
        pincode: &str,
        _buyer_phone: Option<String>,
    ) -> AppResult<(f64, f64)> {
        let product = self
            .product_repo
            .find_by_id(link_id)
            .await?
            .ok_or_else(|| AppError::NotFound("Product link not found".to_string()))?;

        let merchant = self
            .merchant_repo
            .find_by_id(&product.merchant_id)
            .await?
            .ok_or_else(|| AppError::NotFound("Merchant not found".to_string()))?;

        let distance_km =
            crate::domain::distance::estimate_distance_km(&merchant.base_pincode, pincode);

        let pricing_features = crate::application::services::pricing::PricingFeatures {
            distance_km,
            user_rate_per_km: merchant.delivery_rate_per_km,
            product_weight: product.expected_weight,
            base_charge: merchant.delivery_base_fee,
            config: serde_json::from_value(merchant.logistics_config.clone()).unwrap_or_default(),
        };

        let fee = crate::application::services::pricing::PricingEngine::estimate_delivery_fee(
            pricing_features,
        );

        Ok((fee, distance_km))
    }
}