package integration

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

type ObservationInterface interface {
	CreateObservation(req model.ObservationRequest) (map[string]interface{}, error)
	GetObservationByPatient(id string) (map[string]interface{}, error)
	GetObservationByPatientCategory(id string, category string) (map[string]interface{}, error)
	HandleCheckObservation(id string) ([]string, bool, error)
	HandleCheckObservationCategory(id string, category string) ([]string, bool, error)
	UpdateObservation(req model.ObservationRequest) (map[string]interface{}, error)
}

type ObservationRepository struct {
	akses *model.Akses
}

// GetObservationByPatientCategory implements ObservationInterface.
func (o *ObservationRepository) GetObservationByPatientCategory(id string, category string) (map[string]interface{}, error) {
	var data map[string]interface{}

	url := o.akses.BaseUrl + "/Observation?subject=" + id + "&category=" + category
	method := "GET"

	client := &http.Client{}
	request, err := http.NewRequest(method, url, nil)
	if err != nil {
		return nil, err
	}
	oauth := model.OauthRequest{
		ClientId:     o.akses.ClientId,
		ClientSecret: o.akses.ClientSecret,
	}
	OauthInterface := NewOauthRequestRepo(o.akses)
	token, err := OauthInterface.GenerateToken(oauth)
	if err != nil {
		return nil, err
	}
	if token != nil {
		request.Header.Set("Authorization", "Bearer "+token.AccessToken)
	}
	request.Header.Set("Content-Type", 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
}

// HandleCheckObservationCategory implements ObservationInterface.
func (o *ObservationRepository) HandleCheckObservationCategory(id string, category string) ([]string, bool, error) {
	observation, err := o.GetObservationByPatientCategory(id, category)
	if err != nil {
		return nil, false, err
	}
	var ids []string
	if entries, ok := observation["entry"].([]interface{}); ok && len(entries) != 0 {
		if entries, ok := (observation)["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
}

// HandleCheckObservation implements ObservationInterface.
func (o *ObservationRepository) HandleCheckObservation(id string) ([]string, bool, error) {
	observation, err := o.GetObservationByPatient(id)
	if err != nil {
		return nil, false, err
	}

	var ids []string
	if entries, ok := observation["entry"].([]interface{}); ok && len(entries) != 0 {
		if entries, ok := (observation)["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
}

// GetObservationByPatient implements ObservationInterface.
func (o *ObservationRepository) GetObservationByPatient(id string) (map[string]interface{}, error) {
	var (
		data map[string]interface{}
	)
	url := o.akses.BaseUrl + "/Observation?subject=" + id
	method := "GET"

	client := http.Client{}
	request, err := http.NewRequest(method, url, nil)
	if err != nil {
		return nil, err
	}
	oauth := model.OauthRequest{
		ClientId:     o.akses.ClientId,
		ClientSecret: o.akses.ClientSecret,
	}
	OauthInterface := NewOauthRequestRepo(o.akses)
	token, err := OauthInterface.GenerateToken(oauth)
	if err != nil {
		return nil, err
	}
	if token != nil {
		request.Header.Add("Authorization", "Bearer "+token.AccessToken)
	} else {
		return nil, errors.New(constant.ErrGenerateToken)
	}
	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
}

// CreateObservation implements ObservationInterface.
func (o *ObservationRepository) CreateObservation(req model.ObservationRequest) (map[string]interface{}, error) {
	var (
		data = make(map[string]interface{})
	)
	req.ResourceType = constant.ObservationResourceType

	// Setup Patient
	var patient string
	if req.Subject.Reference != "" {
		patientInterface := NewPatientRepo(o.akses)
		var err error
		patient, err = patientInterface.HandleCheckPatient(req.Subject.Reference)
		if err != nil {
			return nil, err
		}

		if patient == "" { // Belum ada di satu sehat
			return nil, errors.New("patient not found")
		} else {
			req.Subject.Reference = "Patient/" + patient
		}
	}

	//Setup Practitioner
	// if req.Performer != nil && len(req.Performer) > 0 {
	// 	practitionerInterface := NewPracticionerRepo(o.akses)
	// 	practitionerId, _, err := practitionerInterface.HandleCheckPartitioner(req.Performer[0].Reference)
	// 	if err != nil {
	// 		return nil, err
	// 	}
	// 	if practitionerId != "" {
	// 		req.Performer = []model.Reference{
	// 			{Reference: "Practitioner/" + practitionerId},
	// 		}
	// 	} else {
	// 		return nil, errors.New("practitioner not found")
	// 	}
	// }

	// Setup Encounter
	if patient != "" {
		encounterInterface := NewEncounterRepo(o.akses)
		encounterId, encounterExist, err := encounterInterface.HandleCheckEncounter(patient)
		if err != nil {
			return nil, err
		}

		if encounterExist {
			req.Encounter.Reference = "Encounter/" + encounterId
		} else {
			return nil, errors.New("encounter not found")
		}
	}

	//setup service request
	err := o.setupServiceRequest(&req, patient)
	if err != nil {
		return nil, errors.New("service request not found")
	}

	if req.Category[0].Coding[0].Code == "laboratory" {
		//setup specimen
		err = o.setupSpecimen(&req, patient)
		if err != nil {
			return nil, errors.New("specimen not found")
		}
	}

	url := o.akses.BaseUrl + "/Observation"
	method := "POST"

	payload, err := json.Marshal(req)
	if err != nil {
		return nil, err
	}
	client := http.Client{}
	request, err := http.NewRequest(method, url, bytes.NewBuffer(payload))
	if err != nil {
		return nil, err
	}

	oauth := model.OauthRequest{
		ClientId:     o.akses.ClientId,
		ClientSecret: o.akses.ClientSecret,
	}
	OauthInterface := NewOauthRequestRepo(o.akses)
	NewOauthRequestRepo(o.akses)
	token, err := OauthInterface.GenerateToken(oauth)

	if err != nil {
		return nil, err
	}
	request.Header.Set("Authorization", "Bearer "+token.AccessToken)
	request.Header.Set("Content-Type", "application/json")
	response, err := client.Do(request)
	if err != nil {
		return nil, err
	}
	defer response.Body.Close()

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

	return data, nil

}

func (o *ObservationRepository) UpdateObservation(req model.ObservationRequest) (map[string]interface{}, error) {
	req.ResourceType = constant.ObservationResourceType

	// Setup Patient
	var patient string
	if req.Subject.Reference != "" {
		patientInterface := NewPatientRepo(o.akses)
		var err error
		patient, err = patientInterface.HandleCheckPatient(req.Subject.Reference)
		if err != nil {
			return nil, err
		}

		if patient == "" { // Belum ada di satu sehat
			return nil, errors.New("patient not found")
		} else {
			req.Subject.Reference = "Patient/" + patient
		}
	}

	//Setup Practitioner
	// if req.Performer != nil && len(req.Performer) > 0 {
	// 	practitionerInterface := NewPracticionerRepo(o.akses)
	// 	practitionerId, _, err := practitionerInterface.HandleCheckPartitioner(req.Performer[0].Reference)
	// 	if err != nil {
	// 		return nil, err
	// 	}
	// 	if practitionerId != "" {
	// 		req.Performer = []model.Reference{
	// 			{Reference: "Practitioner/" + practitionerId},
	// 		}
	// 	} else {
	// 		return nil, errors.New("practitioner not found")
	// 	}
	// }

	// Setup Encounter
	if patient != "" {
		encounterInterface := NewEncounterRepo(o.akses)
		encounterId, encounterExist, err := encounterInterface.HandleCheckEncounter(patient)
		if err != nil {
			return nil, err
		}

		if encounterExist {
			req.Encounter.Reference = "Encounter/" + encounterId
		} else {
			return nil, errors.New("encounter not found")
		}
	}

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

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

}

func (o *ObservationRepository) setupServiceRequest(req *model.ObservationRequest, patient string) error {
	if patient == "" {
		return nil
	}
	serviceReq := NewServiceRequestRepository(o.akses)
	ids, _, err := serviceReq.HandleCheckServiceRequest(patient)
	if err != nil {
		return err
	}
	if len(ids) > 0 {
		req.BasedOn = []model.Reference{
			{
				Reference: "ServiceRequest/" + ids[0],
			},
		}
	}
	return nil
}

func (o *ObservationRepository) setupSpecimen(req *model.ObservationRequest, patient string) error {
	if patient == "" {
		return nil
	}
	specimenInterface := NewSpecimenRepository(o.akses)
	ids, exist, err := specimenInterface.HandleCheckSpecimen(patient)
	if err != nil {
		return err
	}
	if exist {
		req.Specimen = &model.Reference{}
		req.Specimen.Reference = "Specimen/" + ids[0]
	} else {
		return errors.New("specimen not found")
	}
	return nil
}

func NewObservationRepo(akses *model.Akses) ObservationInterface {
	return &ObservationRepository{akses: akses}
}