package data

import (
	"bytes"
	"encoding/json"
	"errors"
	"fmt"
	"io"
	"io/ioutil"
	"net/http"

	"git.agecem.com/agecem/bottin-agenda/models"
	"git.agecem.com/agecem/bottin-agenda/responses"
)

type ApiClient struct {
	Key      string
	Host     string
	Port     int
	Protocol string
}

func NewApiClient(key, host, protocol string, port int) *ApiClient {
	return &ApiClient{
		Key:      key,
		Host:     host,
		Port:     port,
		Protocol: protocol,
	}
}

func (a *ApiClient) Call(method, route string, requestBody io.Reader, useKey bool) (*http.Response, error) {
	var response *http.Response

	endpoint := fmt.Sprintf("%s://%s:%d%s",
		a.Protocol, a.Host, a.Port, route,
	)

	// Create client
	client := &http.Client{}

	// Create request
	request, err := http.NewRequest(method, endpoint, requestBody)
	if err != nil {
		return response, err
	}

	if useKey {
		if a.Key == "" {
			return response, fmt.Errorf("L'appel au serveur API requiert une clé, mais aucune n'était donnée. Voir --help pour les instructions sur comment fournir une clé API.")
		}

		request.Header.Add("Authorization", fmt.Sprintf("Bearer %s", a.Key))
	}

	if requestBody != nil {
		request.Header.Add("Content-Type", "application/json")
	}

	// Fetch Request
	response, err = client.Do(request)
	if err != nil {
		return response, err
	}

	return response, nil
}

// GetHealth allows checking for API server health
func (a *ApiClient) GetHealth() (string, error) {
	var response responses.GetHealthResponse

	getHealthResponse, err := a.Call(http.MethodGet, "/v3/health", nil, true)
	if err != nil {
		return response.Message, err
	}

	defer getHealthResponse.Body.Close()

	body, err := ioutil.ReadAll(getHealthResponse.Body)
	if err != nil {
		return response.Message, err
	}

	if err := json.Unmarshal(body, &response); err != nil {
		return response.Message, err
	}

	if response.Message == "" {
		return response.Message, errors.New("Impossible de confirmer l'état du serveur API.")
	}

	return response.Message, nil
}

func (a *ApiClient) InsertTransactions(transactions []models.Transaction) ([]models.Transaction, error) {
	var response responses.PostTransactionsResponse

	var buf bytes.Buffer
	err := json.NewEncoder(&buf).Encode(transactions)
	if err != nil {
		return response.Data.Transactions, err
	}

	postHealthResponse, err := a.Call(http.MethodPost, "/v3/transactions", &buf, true)
	defer postHealthResponse.Body.Close()

	body, err := ioutil.ReadAll(postHealthResponse.Body)
	if err != nil {
		return response.Data.Transactions, err
	}

	if err := json.Unmarshal(body, &response); err != nil {
		return response.Data.Transactions, err
	}

	if len(response.Data.Transactions) == 0 {
		return response.Data.Transactions, fmt.Errorf(response.Message)
	}

	return response.Data.Transactions, nil
}