package handlers

import (
	"fmt"
	"net/http"

	"git.agecem.com/agecem/bottin-agenda/data"
	"git.agecem.com/agecem/bottin-agenda/models"
	"git.agecem.com/agecem/bottin-agenda/responses"
	bottindata "git.agecem.com/agecem/bottin/v6/data"
	"github.com/labstack/echo/v4"
	"github.com/spf13/viper"
)

// GetTransactions handles the listing of transactions
func GetTransactions(c echo.Context) error {
	var statusCode int = http.StatusInternalServerError
	var response responses.GetTransactionsResponse

	client, err := data.NewDataClientFromViper()
	if err != nil {
		response.Message = fmt.Sprintf("Erreur pendant data.NewDataClientFromViper(): %s", err)

		return c.JSON(statusCode, response)
	}
	defer client.DB.Close()

	transactions, err := client.ListTransactions()
	response.Data.Transactions = transactions
	if err != nil {
		response.Message = fmt.Sprintf("Erreur pendant client.ListTransactions(): %s", err)

		return c.JSON(statusCode, response)
	}

	if len(transactions) == 0 {
		response.Message = "Aucune transaction trouvée"
		statusCode = http.StatusNotFound

		return c.JSON(statusCode, response)
	}

	response.Message = "Liste complétée"
	statusCode = http.StatusOK

	return c.JSON(statusCode, response)
}

// PostTransactions handles the creation of transactions
func PostTransactions(c echo.Context) error {
	var statusCode int = http.StatusInternalServerError
	var response responses.PostTransactionsResponse

	var transactions []models.Transaction

	if err := c.Bind(&transactions); err != nil {
		statusCode = http.StatusBadRequest
		response.Message = fmt.Sprintf("Erreur pendant c.Bind(): %s", err)

		return c.JSON(statusCode, response)
	}

	client, err := data.NewDataClientFromViper()
	if err != nil {
		response.Message = fmt.Sprintf("Erreur pendant data.NewDataClientFromViper(): %s", err)

		return c.JSON(statusCode, response)
	}
	defer client.DB.Close()

	if len(transactions) == 0 {
		response.Message = fmt.Sprintf("Rien à faire")
		statusCode = http.StatusOK

		return c.JSON(statusCode, response)
	}

	bottinApiKey := viper.GetString("bottin.api.key")
	bottinApiHost := viper.GetString("bottin.api.host")
	bottinApiProtocol := viper.GetString("bottin.api.protocol")
	bottinApiPort := viper.GetInt("bottin.api.port")

	bottinClient := http.DefaultClient
	defer bottinClient.CloseIdleConnections()

	// Using bottin's API client
	bottinApiClient := bottindata.NewApiClient(
		bottinClient,
		bottinApiKey,
		bottinApiHost,
		bottinApiProtocol,
		bottinApiPort,
	)

	// Check if membre_id exists according to bottin
	for _, transaction := range transactions {
		if transaction.MembreID == "" {
			response.Message = fmt.Sprintf("Impossible d'insérer une transaction sans membre_id (numéro étudiant)")
			statusCode = http.StatusBadRequest

			return c.JSON(statusCode, response)
		}
		membre, err := bottinApiClient.GetMembre(transaction.MembreID)
		if err != nil {
			response.Message = fmt.Sprintf("Erreur pendant bottinApiClient.GetMembre(): %s", err)

			return c.JSON(statusCode, response)
		}

		if membre.ID == "" {
			response.Message = fmt.Sprintf("Aucun membre avec numéro étudiant '%s' dans le bottin de l'AGECEM", membre.ID)
			statusCode = http.StatusNotFound

			return c.JSON(statusCode, response)
		}

		// membre exists, can keep going
	}

	// Check for already-existing transactions
	for _, transaction := range transactions {
		transaction, err := client.GetTransaction(transaction.MembreID, transaction.IsPerpetual)
		if err != nil {
			if err.Error() != "sql: no rows in result set" {
				response.Message = fmt.Sprintf("Erreur pendant client.GetTransaction(): %s", err)
			}
		}

		if transaction.ID != "" {
			agendaType := "non-perpétuel"
			if transaction.IsPerpetual {
				agendaType = "perpétuel"
			}

			response.Message = fmt.Sprintf("Membre %s a déjà son agenda %s", transaction.MembreID, agendaType)

			statusCode = http.StatusBadRequest

			return c.JSON(statusCode, response)
		}
	}

	insertedTransactions, err := client.InsertTransactions(transactions)
	response.Data.Transactions = insertedTransactions
	if err != nil {
		response.Message = fmt.Sprintf("Erreur pendant client.InsertTransactions(): %s", err)

		return c.JSON(statusCode, response)
	}

	statusCode = http.StatusCreated
	response.Message = "Insertion complétée"

	return c.JSON(statusCode, response)
}