// test
package server

import (
	"errors"
	"net/http"

	"git.runcible.io/learning/ratchet/internal/validator"
	"github.com/go-playground/form/v4"
)

// Define a snippetCreateForm struct to represent the form data and validation
// errors for the form fields. Note that all the struct fields are deliberately
// exported (i.e. start with a capital letter). This is because struct fields
// must be exported in order to be read by the html/template package when
// rendering the template.
//
// Remove the explicit FieldErrors struct field and instead embed the Validator
// struct. Embedding this means that our snippetCreateForm "inherits" all the
// fields and methods of our Validator struct (including the FieldErrors field).
//
// MOVING TO go-playground/form
// Update our snippetCreateForm struct to include struct tags which tell the
// decoder how to map HTML form values into the different struct fields. So, for
// example, here we're telling the decoder to store the value from the HTML form
// input with the name "title" in the Title field. The struct tag `form:"-"`
// tells the decoder to completely ignore a field during decoding.
type snippetCreateForm struct {
	Title               string `form:"title"`
	Content             string `form:"content"`
	Expires             int    `form:"expires"`
	validator.Validator `form:"-"`
}

func decodePostForm(r *http.Request, fd *form.Decoder, dst any) error {
	err := r.ParseForm()
	if err != nil {
		return err
	}

	err = fd.Decode(dst, r.PostForm)
	if err != nil {
		var invalidDecoderError *form.InvalidDecoderError

		if errors.As(err, &invalidDecoderError) {
			// if called in the handler, recovery middleware
			// will log and send 500 response back
			panic(err)
		}
		return err
	}
	return nil
}