package integration

import (
	"encoding/json"
	"errors"
	"fmt"
	"net/http"
	"os"
	"satusehat-rssa/internal/constant"
	"satusehat-rssa/internal/model"
	"satusehat-rssa/pkg/common"
	"satusehat-rssa/pkg/httputil"
)

type MedicationRequestInterface interface {
	// Define methods for MedicationRequestInterface
	CreateMedicationRequest(req model.MedicationRequestRequest) (map[string]interface{}, error)
	UpdateMedicationRequest(req model.MedicationRequestRequest) (map[string]interface{}, error)
	GetMedicationRequestByPatient(id string, category string) (map[string]interface{}, error)
	HandleCheckMedicationRequest(id string, category string) ([]string, bool, error)
}

type MedicationRequestRepository struct {
	// Define fields for MedicationRequestRepository
	akses *model.Akses
}

func NewMedicationRequestRepo(akses *model.Akses) MedicationRequestInterface {
	return &MedicationRequestRepository{
		akses: akses,
	}
}

// GetMedicationRequestByPatient implements MedicationRequestInterface.
func (c *MedicationRequestRepository) GetMedicationRequestByPatient(id string, category string) (map[string]interface{}, error) {
	var data map[string]interface{}

	url := c.akses.BaseUrl + "/MedicationRequest?subject=" + id
	method := "GET"

	client := &http.Client{}
	request, err := http.NewRequest(method, url, nil)
	if err != nil {
		return nil, err
	}
	oauth := model.OauthRequest{
		ClientId:     c.akses.ClientId,
		ClientSecret: c.akses.ClientSecret,
	}
	token, err := NewOauthRequestRepo(c.akses).GenerateToken(oauth)
	if err != nil {
		return nil, err
	}
	if token == nil {
		return nil, errors.New(constant.ErrGenerateToken)
	}
	request.Header.Add("Authorization", "Bearer "+token.AccessToken)
	request.Header.Set("Content-Type", constant.ContentTypeFHIRJSON)
	request.Header.Set("Accept", constant.ContentTypeFHIRJSON)
	res, err := client.Do(request)
	if err != nil {
		return nil, err
	}
	defer res.Body.Close()

	err = json.NewDecoder(res.Body).Decode(&data)
	if err != nil {
		return nil, err
	}

	return data, nil
}

// HandleCheckMedicationRequest implements MedicationRequestInterface.
func (c *MedicationRequestRepository) HandleCheckMedicationRequest(id string, category string) ([]string, bool, error) {
	medicationReq, err := c.GetMedicationRequestByPatient(id, category)
	if err != nil {
		return nil, false, err
	}
	var ids []string
	if entries, ok := medicationReq["entry"].([]interface{}); ok && len(entries) != 0 {
		if entries, ok := (medicationReq)["entry"].([]interface{}); ok && len(entries) > 0 {
			if entryMap, ok := entries[0].(map[string]interface{}); ok {
				if resource, ok := entryMap["resource"].(map[string]interface{}); ok {
					if id, ok := resource["id"].(string); ok {
						//fmt.Println("resource.id:", id)
						ids = append(ids, id)
						return ids, true, nil
					}
				}
			}
		}
		return nil, true, nil
	}

	return nil, false, nil
}

// CreateMedicationRequest implements MedicationRequestInterface.
func (c *MedicationRequestRepository) CreateMedicationRequest(req model.MedicationRequestRequest) (map[string]interface{}, error) {
	req.ResourceType = constant.MedicationRequestResourceType
	req.Identifier = append(req.Identifier, common.GetIdentifier("prescription"))
	identifierItem := common.GetIdentifier("prescription-item")
	identifierItem.Value += "-1"
	req.Identifier = append(req.Identifier, identifierItem)

	patient, err := c.setupPatient(&req)
	if err != nil {
		return nil, err
	}

	err = c.setupEncounter(&req, patient)
	if err != nil {
		return nil, err
	}

	err = c.setupMedication(&req)
	if err != nil {
		return nil, err
	}
	req.DispenseRequest.Performer.Reference = "Organization/" + os.Getenv("ORGANIZATION_ID")

	req.MedicationRequest = nil

	// err = c.setupPractitioner(&req)
	// if err != nil {
	// 	return nil, err
	// }

	oauth := model.OauthRequest{
		ClientId:     c.akses.ClientId,
		ClientSecret: c.akses.ClientSecret,
	}
	token, err := NewOauthRequestRepo(c.akses).GenerateToken(oauth)
	if err != nil {
		return nil, err
	}
	if token == nil {
		return nil, errors.New(constant.ErrGenerateToken)
	}

	url := c.akses.BaseUrl + "/MedicationRequest"
	return httputil.DoRequest(httputil.RequestOption{
		Method:      "POST",
		URL:         url,
		Body:        req,
		BearerToken: token.AccessToken,
		Headers:     httputil.DefaultFHIRHeaders(),
	})
}

func (c *MedicationRequestRepository) UpdateMedicationRequest(req model.MedicationRequestRequest) (map[string]interface{}, error) {
	req.ResourceType = constant.MedicationRequestResourceType
	req.Identifier = append(req.Identifier, common.GetIdentifier("prescription"))
	identifierItem := common.GetIdentifier("prescription-item")
	identifierItem.Value += "-1"
	req.Identifier = append(req.Identifier, identifierItem)

	patient, err := c.setupPatient(&req)
	if err != nil {
		return nil, err
	}

	err = c.setupEncounter(&req, patient)
	if err != nil {
		return nil, err
	}

	// err = c.setupPractitioner(&req)
	// if err != nil {
	// 	return nil, err
	// }

	oauth := model.OauthRequest{
		ClientId:     c.akses.ClientId,
		ClientSecret: c.akses.ClientSecret,
	}
	token, err := NewOauthRequestRepo(c.akses).GenerateToken(oauth)
	if err != nil {
		return nil, err
	}
	if token == nil {
		return nil, errors.New(constant.ErrGenerateToken)
	}

	url := c.akses.BaseUrl + fmt.Sprintf("/MedicationRequest/%s", req.Id)
	return httputil.DoRequest(httputil.RequestOption{
		Method:      "PUT",
		URL:         url,
		Body:        req,
		BearerToken: token.AccessToken,
		Headers:     httputil.DefaultFHIRHeaders(),
	})
}

func (c *MedicationRequestRepository) setupPatient(req *model.MedicationRequestRequest) (string, error) {
	if req.Subject.Reference == "" {
		return "", nil
	}
	patientInterface := NewPatientRepo(c.akses)
	patient, err := patientInterface.HandleCheckPatient(req.Subject.Reference)
	if err != nil {
		return "", err
	}

	if patient != "" {
		req.Subject.Reference = "Patient/" + patient
	}
	return patient, nil
}

func (c *MedicationRequestRepository) setupEncounter(req *model.MedicationRequestRequest, patient string) error {
	if patient == "" {
		return nil
	}
	encounterInterface := NewEncounterRepo(c.akses)
	encounterId, encounterExist, err := encounterInterface.HandleCheckEncounter(patient)
	if err != nil {
		return err
	}
	if encounterExist {
		req.Encounter.Reference = "Encounter/" + encounterId
	}
	return nil
}

// setupPractitioner handles practitioner reference logic.
func (c *MedicationRequestRepository) setupPractitioner(req *model.MedicationRequestRequest) error {
	if req.Requester.Reference == "" {
		return nil
	}
	practicionerInterface := NewPracticionerRepo(c.akses)
	ref, display, err := practicionerInterface.HandleCheckPartitioner(req.Requester.Reference)
	if err != nil {
		return err
	}
	if ref != "" {
		req.Requester.Reference = "Practitioner/" + ref
		req.Requester.Display = display
	}
	return nil
}

func (c *MedicationRequestRepository) setupMedication(req *model.MedicationRequestRequest) error {
	if req.MedicationRequest == nil {
		return errors.New("Need Medication Request")
	}
	MedicationInterface := NewMedicineKfaRepo(c.akses)
	medication, err := MedicationInterface.MedicationCreate(*req.MedicationRequest)
	if err != nil {
		return err
	}
	if idRaw, ok := medication["id"].(string); ok {
		if idRaw == "" {
			return errors.New("medication id is empty")
		}
		req.MedicationReference.Reference = "Medication/" + idRaw
	}
	return nil
}