package pkg

import (
	"context"
	"net/http"
)

type LanguageOption struct {
	Tag  string
	Name string
}

type ProfilePage struct {
	Name            string
	Email           string
	Password        string
	PasswordConfirm string
	Language        string
	Languages       []LanguageOption
}

func ProfileHandler() http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		user := getUser(r)
		conn := getConn(r)
		page := ProfilePage{
			Email:    user.Email,
			Language: user.Language.String(),
		}
		if r.Method == "POST" {
			r.ParseForm()
			page.Email = r.FormValue("email")
			page.Name = r.FormValue("name")
			page.Password = r.FormValue("password")
			page.PasswordConfirm = r.FormValue("password_confirm")
			page.Language = r.FormValue("language")
			cookie := conn.MustGetText(r.Context(), "", "update user_profile set name = $1, email = $2, lang_tag = $3 returning build_cookie()", page.Name, page.Email, page.Language)
			setSessionCookie(w, cookie)
			if page.Password != "" && page.Password == page.PasswordConfirm {
				conn.MustExec(r.Context(), "select change_password($1)", page.Password)
			}
			http.Redirect(w, r, "/profile", http.StatusSeeOther)
			return
		} else {
			page.Languages = mustGetLanguageOptions(r.Context(), conn)
			if err := conn.QueryRow(r.Context(), "select name from user_profile").Scan(&page.Name); err != nil {
				panic(nil)
			}
		}
		mustRenderAppTemplate(w, r, "profile.gohtml", page)
	})
}

func mustGetLanguageOptions(ctx context.Context, conn *Conn) []LanguageOption {
	rows, err := conn.Query(ctx, "select lang_tag, endonym from language where selectable")
	if err != nil {
		panic(err)
	}
	defer rows.Close()

	var langs []LanguageOption
	for rows.Next() {
		var lang LanguageOption
		err = rows.Scan(&lang.Tag, &lang.Name)
		if err != nil {
			panic(err)
		}
		langs = append(langs, lang)
	}
	if rows.Err() != nil {
		panic(rows.Err())
	}

	return langs
}