package main

import (
	api "code.dlmw.ch/dlmw/qv/internal"
	"code.dlmw.ch/dlmw/qv/internal/validator"
	"encoding/json"
	"io"
	"net"
	"net/http"
	"strings"
)

func (app *application) serverError(w http.ResponseWriter, r *http.Request, err error) {
	app.logger.Error(err.Error())
	w.Header().Set("Content-Type", "application/json")
	w.WriteHeader(http.StatusInternalServerError)
	var response = api.ErrorResponse{
		Code:    http.StatusInternalServerError,
		Details: nil,
		Message: "There was an error in the request",
	}
	json.NewEncoder(w).Encode(response)
}

func (app *application) badRequestError(w http.ResponseWriter, r *http.Request, err error) {
	w.Header().Set("Content-Type", "application/json")
	w.WriteHeader(http.StatusBadRequest)
	var response = api.ErrorResponse{
		Code:    http.StatusBadRequest,
		Message: err.Error(),
	}
	json.NewEncoder(w).Encode(response)
}

func (app *application) clientError(w http.ResponseWriter, status int, message string) {
	w.Header().Set("Content-Type", "application/json")
	w.WriteHeader(status)
	var response = api.ErrorResponse{
		Code:    status,
		Details: nil,
		Message: message,
	}
	json.NewEncoder(w).Encode(response)
}

func (app *application) unprocessableEntityError(w http.ResponseWriter, v validator.Validator) {
	w.Header().Set("Content-Type", "application/json")
	w.WriteHeader(http.StatusUnprocessableEntity)
	var response = api.ErrorResponse{
		Code: http.StatusUnprocessableEntity,
		Details: &map[string]interface{}{
			"fields": v.FieldErrors,
		},
		Message: "Request data is invalid",
	}
	json.NewEncoder(w).Encode(response)
}

func (app *application) unmarshalRequest(r *http.Request, dst any) error {
	body, err := io.ReadAll(r.Body)
	if err != nil {
		return err
	}

	err = json.Unmarshal(body, &dst)
	if err != nil {
		return err
	}

	return nil
}

func realIP(r *http.Request) string {
	var ip string

	if tcip := r.Header.Get(http.CanonicalHeaderKey("True-Client-IP")); tcip != "" {
		ip = tcip
	} else if xrip := r.Header.Get(http.CanonicalHeaderKey("X-Real-IP")); xrip != "" {
		ip = xrip
	} else if xff := r.Header.Get(http.CanonicalHeaderKey("X-Forwarded-For")); xff != "" {
		i := strings.Index(xff, ",")
		if i == -1 {
			i = len(xff)
		}
		ip = xff[:i]
	}
	if ip == "" || net.ParseIP(ip) == nil {
		return ""
	}
	return ip
}