pub mod transformers;

use common_enums::enums;
use common_utils::{
    errors::CustomResult,
    ext_traits::BytesExt,
    request::{Method, Request, RequestBuilder, RequestContent},
    types::{AmountConvertor, StringMinorUnit, StringMinorUnitForConnector},
};
use error_stack::{report, ResultExt};
use hyperswitch_domain_models::{
    router_data::{AccessToken, ConnectorAuthType, ErrorResponse, RouterData},
    router_flow_types::{
        access_token_auth::AccessTokenAuth,
        payments::{Authorize, Capture, PSync, PaymentMethodToken, Session, SetupMandate, Void},
        refunds::{Execute, RSync},
    },
    router_request_types::{
        AccessTokenRequestData, PaymentMethodTokenizationData, PaymentsAuthorizeData,
        PaymentsCancelData, PaymentsCaptureData, PaymentsSessionData, PaymentsSyncData,
        RefundsData, SetupMandateRequestData,
    },
    router_response_types::{
        ConnectorInfo, PaymentMethodDetails, PaymentsResponseData, RefundsResponseData,
        SupportedPaymentMethods, SupportedPaymentMethodsExt,
    },
    types::{
        PaymentsAuthorizeRouterData, PaymentsCaptureRouterData, PaymentsSyncRouterData,
        RefundSyncRouterData, RefundsRouterData,
    },
};
use hyperswitch_interfaces::{
    api::{
        self, ConnectorCommon, ConnectorCommonExt, ConnectorIntegration, ConnectorSpecifications,
        ConnectorValidation,
    },
    configs::Connectors,
    errors,
    events::connector_api_logs::ConnectorEvent,
    types::{self, Response},
    webhooks,
};
use lazy_static::lazy_static;
use transformers as paytm;

use crate::{constants::headers, types::ResponseRouterData, utils};

#[derive(Clone)]
pub struct Paytm {
    amount_converter: &'static (dyn AmountConvertor<Output = StringMinorUnit> + Sync),
}

impl Paytm {
    pub fn new() -> &'static Self {
        &Self {
            amount_converter: &StringMinorUnitForConnector,
        }
    }
}

impl api::Payment for Paytm {}
impl api::PaymentSession for Paytm {}
impl api::ConnectorAccessToken for Paytm {}
impl api::MandateSetup for Paytm {}
impl api::PaymentAuthorize for Paytm {}
impl api::PaymentSync for Paytm {}
impl api::PaymentCapture for Paytm {}
impl api::PaymentVoid for Paytm {}
impl api::Refund for Paytm {}
impl api::RefundExecute for Paytm {}
impl api::RefundSync for Paytm {}
impl api::PaymentToken for Paytm {}

impl ConnectorIntegration<PaymentMethodToken, PaymentMethodTokenizationData, PaymentsResponseData>
    for Paytm
{
    // Not Implemented (R)
}

impl<Flow, Request, Response> ConnectorCommonExt<Flow, Request, Response> for Paytm
where
    Self: ConnectorIntegration<Flow, Request, Response>,
{
    fn build_headers(
        &self,
        req: &RouterData<Flow, Request, Response>,
        _connectors: &Connectors,
    ) -> CustomResult<Vec<(String, hyperswitch_masking::Maskable<String>)>, errors::ConnectorError>
    {
        let mut header = vec![(
            headers::CONTENT_TYPE.to_string(),
            self.get_content_type().to_string().into(),
        )];
        let mut api_key = self.get_auth_header(&req.connector_auth_type)?;
        header.append(&mut api_key);
        Ok(header)
    }
}

impl ConnectorCommon for Paytm {
    fn id(&self) -> &'static str {
        "paytm"
    }

    fn get_currency_unit(&self) -> api::CurrencyUnit {
        api::CurrencyUnit::Minor
    }

    fn common_get_content_type(&self) -> &'static str {
        "application/json"
    }

    fn base_url<'a>(&self, connectors: &'a Connectors) -> &'a str {
        connectors.paytm.base_url.as_ref()
    }

    fn get_auth_header(
        &self,
        _auth_type: &ConnectorAuthType,
    ) -> CustomResult<Vec<(String, hyperswitch_masking::Maskable<String>)>, errors::ConnectorError>
    {
        // This method is not implemented for Paytm, as it will always call the UCS service which has the logic to create headers.
        Err(errors::ConnectorError::NotImplemented("get_auth_header method".to_string()).into())
    }

    fn build_error_response(
        &self,
        res: Response,
        event_builder: Option<&mut ConnectorEvent>,
    ) -> CustomResult<ErrorResponse, errors::ConnectorError> {
        let response: paytm::PaytmErrorResponse =
            res.response
                .parse_struct("PaytmErrorResponse")
                .change_context(errors::ConnectorError::ResponseDeserializationFailed)?;

        event_builder.map(|i| i.set_response_body(&response));
        router_env::logger::info!(connector_response=?response);

        Ok(ErrorResponse {
            status_code: res.status_code,
            code: response.code,
            message: response.message,
            reason: response.reason,
            attempt_status: None,
            connector_transaction_id: None,
            connector_response_reference_id: None,
            network_advice_code: None,
            network_decline_code: None,
            network_error_message: None,
            connector_metadata: None,
        })
    }
}

impl ConnectorValidation for Paytm {
    fn validate_psync_reference_id(
        &self,
        _data: &PaymentsSyncData,
        _is_three_ds: bool,
        _status: enums::AttemptStatus,
        _connector_meta_data: Option<common_utils::pii::SecretSerdeValue>,
    ) -> CustomResult<(), errors::ConnectorError> {
        Ok(())
    }
}

impl ConnectorIntegration<Session, PaymentsSessionData, PaymentsResponseData> for Paytm {
    //TODO: implement sessions flow
}

impl ConnectorIntegration<AccessTokenAuth, AccessTokenRequestData, AccessToken> for Paytm {}

impl ConnectorIntegration<SetupMandate, SetupMandateRequestData, PaymentsResponseData> for Paytm {}

impl ConnectorIntegration<Authorize, PaymentsAuthorizeData, PaymentsResponseData> for Paytm {
    fn get_headers(
        &self,
        req: &PaymentsAuthorizeRouterData,
        connectors: &Connectors,
    ) -> CustomResult<Vec<(String, hyperswitch_masking::Maskable<String>)>, errors::ConnectorError>
    {
        self.build_headers(req, connectors)
    }

    fn get_content_type(&self) -> &'static str {
        self.common_get_content_type()
    }

    fn get_url(
        &self,
        _req: &PaymentsAuthorizeRouterData,
        _connectors: &Connectors,
    ) -> CustomResult<String, errors::ConnectorError> {
        Err(errors::ConnectorError::NotImplemented("get_url method".to_string()).into())
    }

    fn get_request_body(
        &self,
        req: &PaymentsAuthorizeRouterData,
        _connectors: &Connectors,
    ) -> CustomResult<RequestContent, errors::ConnectorError> {
        let amount = utils::convert_amount(
            self.amount_converter,
            req.request.minor_amount,
            req.request.currency,
        )?;

        let connector_router_data = paytm::PaytmRouterData::from((amount, req));
        let connector_req = paytm::PaytmPaymentsRequest::try_from(&connector_router_data)?;
        Ok(RequestContent::Json(Box::new(connector_req)))
    }

    fn build_request(
        &self,
        req: &PaymentsAuthorizeRouterData,
        connectors: &Connectors,
    ) -> CustomResult<Option<Request>, errors::ConnectorError> {
        Ok(Some(
            RequestBuilder::new()
                .method(Method::Post)
                .url(&types::PaymentsAuthorizeType::get_url(
                    self, req, connectors,
                )?)
                .attach_default_headers()
                .headers(types::PaymentsAuthorizeType::get_headers(
                    self, req, connectors,
                )?)
                .set_body(types::PaymentsAuthorizeType::get_request_body(
                    self, req, connectors,
                )?)
                .build(),
        ))
    }

    fn handle_response(
        &self,
        data: &PaymentsAuthorizeRouterData,
        event_builder: Option<&mut ConnectorEvent>,
        res: Response,
    ) -> CustomResult<PaymentsAuthorizeRouterData, errors::ConnectorError> {
        let response: paytm::PaytmPaymentsResponse = res
            .response
            .parse_struct("Paytm PaymentsAuthorizeResponse")
            .change_context(errors::ConnectorError::ResponseDeserializationFailed)?;
        event_builder.map(|i| i.set_response_body(&response));
        router_env::logger::info!(connector_response=?response);
        RouterData::try_from(ResponseRouterData {
            response,
            data: data.clone(),
            http_code: res.status_code,
        })
    }

    fn get_error_response(
        &self,
        res: Response,
        event_builder: Option<&mut ConnectorEvent>,
    ) -> CustomResult<ErrorResponse, errors::ConnectorError> {
        self.build_error_response(res, event_builder)
    }
}

impl ConnectorIntegration<PSync, PaymentsSyncData, PaymentsResponseData> for Paytm {
    fn get_headers(
        &self,
        req: &PaymentsSyncRouterData,
        connectors: &Connectors,
    ) -> CustomResult<Vec<(String, hyperswitch_masking::Maskable<String>)>, errors::ConnectorError>
    {
        self.build_headers(req, connectors)
    }

    fn get_content_type(&self) -> &'static str {
        self.common_get_content_type()
    }

    fn get_url(
        &self,
        _req: &PaymentsSyncRouterData,
        _connectors: &Connectors,
    ) -> CustomResult<String, errors::ConnectorError> {
        Err(errors::ConnectorError::NotImplemented("get_url method".to_string()).into())
    }

    fn build_request(
        &self,
        req: &PaymentsSyncRouterData,
        connectors: &Connectors,
    ) -> CustomResult<Option<Request>, errors::ConnectorError> {
        Ok(Some(
            RequestBuilder::new()
                .method(Method::Get)
                .url(&types::PaymentsSyncType::get_url(self, req, connectors)?)
                .attach_default_headers()
                .headers(types::PaymentsSyncType::get_headers(self, req, connectors)?)
                .build(),
        ))
    }

    fn handle_response(
        &self,
        data: &PaymentsSyncRouterData,
        event_builder: Option<&mut ConnectorEvent>,
        res: Response,
    ) -> CustomResult<PaymentsSyncRouterData, errors::ConnectorError> {
        let response: paytm::PaytmPaymentsResponse = res
            .response
            .parse_struct("paytm PaymentsSyncResponse")
            .change_context(errors::ConnectorError::ResponseDeserializationFailed)?;
        event_builder.map(|i| i.set_response_body(&response));
        router_env::logger::info!(connector_response=?response);
        RouterData::try_from(ResponseRouterData {
            response,
            data: data.clone(),
            http_code: res.status_code,
        })
    }

    fn get_error_response(
        &self,
        res: Response,
        event_builder: Option<&mut ConnectorEvent>,
    ) -> CustomResult<ErrorResponse, errors::ConnectorError> {
        self.build_error_response(res, event_builder)
    }
}

impl ConnectorIntegration<Capture, PaymentsCaptureData, PaymentsResponseData> for Paytm {
    fn get_headers(
        &self,
        req: &PaymentsCaptureRouterData,
        connectors: &Connectors,
    ) -> CustomResult<Vec<(String, hyperswitch_masking::Maskable<String>)>, errors::ConnectorError>
    {
        self.build_headers(req, connectors)
    }

    fn get_content_type(&self) -> &'static str {
        self.common_get_content_type()
    }

    fn get_url(
        &self,
        _req: &PaymentsCaptureRouterData,
        _connectors: &Connectors,
    ) -> CustomResult<String, errors::ConnectorError> {
        Err(errors::ConnectorError::NotImplemented("get_url method".to_string()).into())
    }

    fn get_request_body(
        &self,
        _req: &PaymentsCaptureRouterData,
        _connectors: &Connectors,
    ) -> CustomResult<RequestContent, errors::ConnectorError> {
        Err(errors::ConnectorError::NotImplemented("get_request_body method".to_string()).into())
    }

    fn build_request(
        &self,
        req: &PaymentsCaptureRouterData,
        connectors: &Connectors,
    ) -> CustomResult<Option<Request>, errors::ConnectorError> {
        Ok(Some(
            RequestBuilder::new()
                .method(Method::Post)
                .url(&types::PaymentsCaptureType::get_url(self, req, connectors)?)
                .attach_default_headers()
                .headers(types::PaymentsCaptureType::get_headers(
                    self, req, connectors,
                )?)
                .set_body(types::PaymentsCaptureType::get_request_body(
                    self, req, connectors,
                )?)
                .build(),
        ))
    }

    fn handle_response(
        &self,
        data: &PaymentsCaptureRouterData,
        event_builder: Option<&mut ConnectorEvent>,
        res: Response,
    ) -> CustomResult<PaymentsCaptureRouterData, errors::ConnectorError> {
        let response: paytm::PaytmPaymentsResponse = res
            .response
            .parse_struct("Paytm PaymentsCaptureResponse")
            .change_context(errors::ConnectorError::ResponseDeserializationFailed)?;
        event_builder.map(|i| i.set_response_body(&response));
        router_env::logger::info!(connector_response=?response);
        RouterData::try_from(ResponseRouterData {
            response,
            data: data.clone(),
            http_code: res.status_code,
        })
    }

    fn get_error_response(
        &self,
        res: Response,
        event_builder: Option<&mut ConnectorEvent>,
    ) -> CustomResult<ErrorResponse, errors::ConnectorError> {
        self.build_error_response(res, event_builder)
    }
}

impl ConnectorIntegration<Void, PaymentsCancelData, PaymentsResponseData> for Paytm {}

impl ConnectorIntegration<Execute, RefundsData, RefundsResponseData> for Paytm {
    fn get_headers(
        &self,
        req: &RefundsRouterData<Execute>,
        connectors: &Connectors,
    ) -> CustomResult<Vec<(String, hyperswitch_masking::Maskable<String>)>, errors::ConnectorError>
    {
        self.build_headers(req, connectors)
    }

    fn get_content_type(&self) -> &'static str {
        self.common_get_content_type()
    }

    fn get_url(
        &self,
        _req: &RefundsRouterData<Execute>,
        _connectors: &Connectors,
    ) -> CustomResult<String, errors::ConnectorError> {
        Err(errors::ConnectorError::NotImplemented("get_url method".to_string()).into())
    }

    fn get_request_body(
        &self,
        req: &RefundsRouterData<Execute>,
        _connectors: &Connectors,
    ) -> CustomResult<RequestContent, errors::ConnectorError> {
        let refund_amount = utils::convert_amount(
            self.amount_converter,
            req.request.minor_refund_amount,
            req.request.currency,
        )?;

        let connector_router_data = paytm::PaytmRouterData::from((refund_amount, req));
        let connector_req = paytm::PaytmRefundRequest::try_from(&connector_router_data)?;
        Ok(RequestContent::Json(Box::new(connector_req)))
    }

    fn build_request(
        &self,
        req: &RefundsRouterData<Execute>,
        connectors: &Connectors,
    ) -> CustomResult<Option<Request>, errors::ConnectorError> {
        let request = RequestBuilder::new()
            .method(Method::Post)
            .url(&types::RefundExecuteType::get_url(self, req, connectors)?)
            .attach_default_headers()
            .headers(types::RefundExecuteType::get_headers(
                self, req, connectors,
            )?)
            .set_body(types::RefundExecuteType::get_request_body(
                self, req, connectors,
            )?)
            .build();
        Ok(Some(request))
    }

    fn handle_response(
        &self,
        data: &RefundsRouterData<Execute>,
        event_builder: Option<&mut ConnectorEvent>,
        res: Response,
    ) -> CustomResult<RefundsRouterData<Execute>, errors::ConnectorError> {
        let response: paytm::RefundResponse = res
            .response
            .parse_struct("paytm RefundResponse")
            .change_context(errors::ConnectorError::ResponseDeserializationFailed)?;
        event_builder.map(|i| i.set_response_body(&response));
        router_env::logger::info!(connector_response=?response);
        RouterData::try_from(ResponseRouterData {
            response,
            data: data.clone(),
            http_code: res.status_code,
        })
    }

    fn get_error_response(
        &self,
        res: Response,
        event_builder: Option<&mut ConnectorEvent>,
    ) -> CustomResult<ErrorResponse, errors::ConnectorError> {
        self.build_error_response(res, event_builder)
    }
}

impl ConnectorIntegration<RSync, RefundsData, RefundsResponseData> for Paytm {
    fn get_headers(
        &self,
        req: &RefundSyncRouterData,
        connectors: &Connectors,
    ) -> CustomResult<Vec<(String, hyperswitch_masking::Maskable<String>)>, errors::ConnectorError>
    {
        self.build_headers(req, connectors)
    }

    fn get_content_type(&self) -> &'static str {
        self.common_get_content_type()
    }

    fn get_url(
        &self,
        _req: &RefundSyncRouterData,
        _connectors: &Connectors,
    ) -> CustomResult<String, errors::ConnectorError> {
        Err(errors::ConnectorError::NotImplemented("get_url method".to_string()).into())
    }

    fn build_request(
        &self,
        req: &RefundSyncRouterData,
        connectors: &Connectors,
    ) -> CustomResult<Option<Request>, errors::ConnectorError> {
        Ok(Some(
            RequestBuilder::new()
                .method(Method::Get)
                .url(&types::RefundSyncType::get_url(self, req, connectors)?)
                .attach_default_headers()
                .headers(types::RefundSyncType::get_headers(self, req, connectors)?)
                .set_body(types::RefundSyncType::get_request_body(
                    self, req, connectors,
                )?)
                .build(),
        ))
    }

    fn handle_response(
        &self,
        data: &RefundSyncRouterData,
        event_builder: Option<&mut ConnectorEvent>,
        res: Response,
    ) -> CustomResult<RefundSyncRouterData, errors::ConnectorError> {
        let response: paytm::RefundResponse = res
            .response
            .parse_struct("paytm RefundSyncResponse")
            .change_context(errors::ConnectorError::ResponseDeserializationFailed)?;
        event_builder.map(|i| i.set_response_body(&response));
        router_env::logger::info!(connector_response=?response);
        RouterData::try_from(ResponseRouterData {
            response,
            data: data.clone(),
            http_code: res.status_code,
        })
    }

    fn get_error_response(
        &self,
        res: Response,
        event_builder: Option<&mut ConnectorEvent>,
    ) -> CustomResult<ErrorResponse, errors::ConnectorError> {
        self.build_error_response(res, event_builder)
    }
}

#[async_trait::async_trait]
impl webhooks::IncomingWebhook for Paytm {
    fn get_webhook_object_reference_id(
        &self,
        _request: &webhooks::IncomingWebhookRequestDetails<'_>,
    ) -> CustomResult<api_models::webhooks::ObjectReferenceId, errors::ConnectorError> {
        Err(report!(errors::ConnectorError::WebhooksNotImplemented))
    }

    fn get_webhook_event_type(
        &self,
        _request: &webhooks::IncomingWebhookRequestDetails<'_>,
        _context: Option<&webhooks::WebhookContext>,
    ) -> CustomResult<api_models::webhooks::IncomingWebhookEvent, errors::ConnectorError> {
        Err(report!(errors::ConnectorError::WebhooksNotImplemented))
    }

    fn get_webhook_resource_object(
        &self,
        _request: &webhooks::IncomingWebhookRequestDetails<'_>,
    ) -> CustomResult<Box<dyn hyperswitch_masking::ErasedMaskSerialize>, errors::ConnectorError>
    {
        Err(report!(errors::ConnectorError::WebhooksNotImplemented))
    }
}

lazy_static! {
    static ref PAYTM_SUPPORTED_PAYMENT_METHODS: SupportedPaymentMethods = {
        let supported_capture_methods = vec![enums::CaptureMethod::Automatic];

        let mut paytm_supported_payment_methods = SupportedPaymentMethods::new();
        paytm_supported_payment_methods.add(
            enums::PaymentMethod::Upi,
            enums::PaymentMethodType::UpiCollect,
            PaymentMethodDetails{
                mandates: common_enums::FeatureStatus::NotSupported,
                refunds: common_enums::FeatureStatus::NotSupported,
                supported_capture_methods: supported_capture_methods.clone(),
                specific_features: None,
            },
        );

        paytm_supported_payment_methods.add(
            enums::PaymentMethod::Upi,
            enums::PaymentMethodType::UpiIntent,
            PaymentMethodDetails{
                mandates: common_enums::FeatureStatus::NotSupported,
                refunds: common_enums::FeatureStatus::NotSupported,
                supported_capture_methods,
                specific_features: None,
            },
        );

        paytm_supported_payment_methods
    };

    static ref PAYTM_CONNECTOR_INFO: ConnectorInfo = ConnectorInfo {
        display_name: "PAYTM",
        description:
            "Paytm is an Indian multinational fintech company specializing in digital payments and financial services. Initially known for its mobile wallet, it has expanded to include a payment bank, e-commerce, ticketing, and wealth management services.",
            connector_type: enums::HyperswitchConnectorCategory::PaymentGateway,
        integration_status: enums::ConnectorIntegrationStatus::Alpha,
    };

    static ref PAYTM_SUPPORTED_WEBHOOK_FLOWS: Vec<enums::EventClass> = Vec::new();

}

impl ConnectorSpecifications for Paytm {
    fn get_connector_about(&self) -> Option<&'static ConnectorInfo> {
        Some(&*PAYTM_CONNECTOR_INFO)
    }

    fn get_supported_payment_methods(&self) -> Option<&'static SupportedPaymentMethods> {
        Some(&*PAYTM_SUPPORTED_PAYMENT_METHODS)
    }

    fn get_supported_webhook_flows(&self) -> Option<&'static [enums::EventClass]> {
        Some(&*PAYTM_SUPPORTED_WEBHOOK_FLOWS)
    }

    fn is_authorize_session_token_call_required(
        &self,
        _current_flow: Option<api::CurrentFlowInfo>,
    ) -> bool {
        true
    }
}
