package paymentapiimp

import (
	"encoding/json"
	"net/http"
	"strings"

	"github.com/tech/sendico/pkg/api/http/response"
	"github.com/tech/sendico/pkg/merrors"
	"github.com/tech/sendico/pkg/model"
	"github.com/tech/sendico/pkg/mutil/mzap"
	quotationv2 "github.com/tech/sendico/pkg/proto/payments/quotation/v2"
	"github.com/tech/sendico/server/interface/api/srequest"
	"github.com/tech/sendico/server/interface/api/sresponse"
	mutil "github.com/tech/sendico/server/internal/mutil/param"
	"go.mongodb.org/mongo-driver/v2/bson"
	"go.uber.org/zap"
)

func (a *PaymentAPI) quotePayment(r *http.Request, account *model.Account, token *sresponse.TokenData) http.HandlerFunc {
	orgRef, err := a.oph.GetRef(r)
	if err != nil {
		a.logger.Warn("Failed to parse organization reference for quote", zap.Error(err), zap.String(a.oph.Name(), a.oph.GetID(r)))
		return response.BadReference(a.logger, a.Name(), a.oph.Name(), a.oph.GetID(r), err)
	}

	ctx := r.Context()
	allowed, err := a.enf.Enforce(ctx, a.permissionRef, account.ID, orgRef, bson.NilObjectID, model.ActionCreate)
	if err != nil {
		a.logger.Warn("Failed to check payments access permissions", zap.Error(err), mutil.PLog(a.oph, r))
		return response.Auto(a.logger, a.Name(), err)
	}
	if !allowed {
		a.logger.Debug("Access denied when quoting payment", mutil.PLog(a.oph, r))
		return response.AccessDenied(a.logger, a.Name(), "payments write permission denied")
	}

	payload, err := decodeQuotePayload(r)
	if err != nil {
		a.logger.Debug("Failed to decode payload", zap.Error(err), mutil.PLog(a.oph, r))
		return response.BadPayload(a.logger, a.Name(), err)
	}
	if err := payload.Validate(); err != nil {
		a.logger.Debug("Failed to validate payload", zap.Error(err), mutil.PLog(a.oph, r))
		return response.Auto(a.logger, a.Name(), err)
	}

	applyCustomerIP(&payload.Intent, r.RemoteAddr)
	intent, err := mapQuoteIntent(&payload.Intent)
	if err != nil {
		a.logger.Debug("Failed to map payment intent", zap.Error(err), mutil.PLog(a.oph, r))
		return response.BadPayload(a.logger, a.Name(), err)
	}

	req := &quotationv2.QuotePaymentRequest{
		Meta:           requestMeta(orgRef.Hex(), payload.IdempotencyKey),
		IdempotencyKey: payload.IdempotencyKey,
		Intent:         intent,
		PreviewOnly:    payload.PreviewOnly,
		InitiatorRef:   initiatorRef(account),
	}

	resp, err := a.quotation.QuotePayment(ctx, req)
	if err != nil {
		a.logger.Warn("Failed to quote payment", zap.Error(err), mzap.ObjRef("organization_ref", orgRef))
		return grpcErrorResponse(a.logger, a.Name(), err)
	}

	return sresponse.PaymentQuoteResponse(a.logger, resp.GetIdempotencyKey(), resp.GetQuote(), token)
}

func (a *PaymentAPI) quotePayments(r *http.Request, account *model.Account, token *sresponse.TokenData) http.HandlerFunc {
	orgRef, err := a.oph.GetRef(r)
	if err != nil {
		a.logger.Warn("Failed to parse organization reference for quotes", zap.Error(err), zap.String(a.oph.Name(), a.oph.GetID(r)))
		return response.BadReference(a.logger, a.Name(), a.oph.Name(), a.oph.GetID(r), err)
	}

	ctx := r.Context()
	allowed, err := a.enf.Enforce(ctx, a.permissionRef, account.ID, orgRef, bson.NilObjectID, model.ActionCreate)
	if err != nil {
		a.logger.Warn("Failed to check payments access permissions", zap.Error(err), mutil.PLog(a.oph, r))
		return response.Auto(a.logger, a.Name(), err)
	}
	if !allowed {
		a.logger.Debug("Access denied when quoting payments", mutil.PLog(a.oph, r))
		return response.AccessDenied(a.logger, a.Name(), "payments write permission denied")
	}

	payload, err := decodeQuotePaymentsPayload(r)
	if err != nil {
		a.logger.Debug("Failed to decode payload", zap.Error(err), mutil.PLog(a.oph, r))
		return response.BadPayload(a.logger, a.Name(), err)
	}
	if err := payload.Validate(); err != nil {
		a.logger.Debug("Failed to validate payload", zap.Error(err), mutil.PLog(a.oph, r))
		return response.Auto(a.logger, a.Name(), err)
	}

	intents := make([]*quotationv2.QuoteIntent, 0, len(payload.Intents))
	for i := range payload.Intents {
		applyCustomerIP(&payload.Intents[i], r.RemoteAddr)
		intent, err := mapQuoteIntent(&payload.Intents[i])
		if err != nil {
			a.logger.Debug("Failed to map payment intent", zap.Error(err), mutil.PLog(a.oph, r))
			return response.BadPayload(a.logger, a.Name(), err)
		}
		intents = append(intents, intent)
	}

	req := &quotationv2.QuotePaymentsRequest{
		Meta:           requestMeta(orgRef.Hex(), payload.IdempotencyKey),
		IdempotencyKey: payload.IdempotencyKey,
		Intents:        intents,
		PreviewOnly:    payload.PreviewOnly,
		InitiatorRef:   initiatorRef(account),
	}

	resp, err := a.quotation.QuotePayments(ctx, req)
	if err != nil {
		a.logger.Warn("Failed to quote payments", zap.Error(err), mzap.ObjRef("organization_ref", orgRef))
		return grpcErrorResponse(a.logger, a.Name(), err)
	}

	return sresponse.PaymentQuotesResponse(a.logger, resp, token)
}

func decodeQuotePayload(r *http.Request) (*srequest.QuotePayment, error) {
	defer r.Body.Close()

	payload := &srequest.QuotePayment{}
	if err := json.NewDecoder(r.Body).Decode(payload); err != nil {
		return nil, merrors.InvalidArgument("invalid payload: "+err.Error(), "payload")
	}
	payload.IdempotencyKey = strings.TrimSpace(payload.IdempotencyKey)
	if err := payload.Validate(); err != nil {
		return nil, err
	}
	return payload, nil
}

func decodeQuotePaymentsPayload(r *http.Request) (*srequest.QuotePayments, error) {
	defer r.Body.Close()

	payload := &srequest.QuotePayments{}
	if err := json.NewDecoder(r.Body).Decode(payload); err != nil {
		return nil, merrors.InvalidArgument("invalid payload: "+err.Error(), "payload")
	}
	payload.IdempotencyKey = strings.TrimSpace(payload.IdempotencyKey)
	if err := payload.Validate(); err != nil {
		return nil, err
	}
	return payload, nil
}