package main

import (
	"errors"
	"net/http"

	"greenlight.craftr.fr/internal/data"
	"greenlight.craftr.fr/internal/validator"
)

func (app *application) registerUserHandler(w http.ResponseWriter, r *http.Request) {
	// Create an anonymous struct to hold the expected data from the request body
	var input struct {
		Name     string `json:"name"`
		Email    string `json:"email"`
		Password string `json:"password"`
	}

	// Parse the request body into the anonymous struct
	err := app.readJSON(w, r, &input)
	if err != nil {
		app.badRequestResponse(w, r, err)
		return
	}

	// Copy the data from the request body into a new User struct. Notice also that we set the Activated field to false, which isn't strictly necessary because the Activated field will have the zero-value of false by default. But setting this explicitly helps to male our intentions clear to anyone reading the code.
	user := &data.User{
		Name:      input.Name,
		Email:     input.Email,
		Activated: false,
	}

	// Use the Password.Set() method to generate and store the hashed and plaintext passwords
	err = user.Password.Set(input.Password)
	if err != nil {
		app.serverErrorResponse(w, r, err)
		return
	}

	v := validator.New()

	// Validate the user struct and return the error messages to the client if any of the checks fail
	if data.ValidateUser(v, user); !v.Valid() {
		app.failedValidationResponse(w, r, v.Errors)
		return
	}

	// Insert the user data into the database
	err = app.models.Users.Insert(user)
	if err != nil {
		switch {
		// If we get a ErrDuplicateEmail error, use the v.AddError() method to manually add a message to the validator instance, and then cal our failedValidationResponse() helper
		case errors.Is(err, data.ErrDuplicateEmail):
			v.AddError("email", "a user with this email address already exists")
			app.failedValidationResponse(w, r, v.Errors)
		default:
			app.serverErrorResponse(w, r, err)
		}
		return
	}

	// Use the background helper to execute an anonymous function that send the welcome email
	app.background(func() {
		// Call the Send() method on our Mail, passing in the user's email address, name of the template file, and the User struct containing the new user's data.
		err = app.mailer.Send(user.Email, "user_welcome.tmpl", user)
		
		if err != nil {
			// Importantly, if there is an error sending the email, then we use the app.logger.Error() helper to manage it, instead of the app.serverErrorResponse() helper like before.
			app.logger.Error(err.Error())
		}
	})

	// Not that we also change this to send the client a 202 Accepted status code. This status code indicates that the request has been accepted for processing, but the processing has not been completed.
	err = app.writeJSON(w, http.StatusAccepted, envelope{"user": user}, nil)
	if err != nil {
		app.serverErrorResponse(w, r, err)
	}
}