package account

import (
	"net/http"
	"strings"
	"time"

	"git.kirsle.net/apps/gosocial/pkg/config"
	"git.kirsle.net/apps/gosocial/pkg/session"
	"git.kirsle.net/apps/gosocial/pkg/templates"
	"git.kirsle.net/apps/gosocial/pkg/utility"
)

// User settings page. (/settings).
func Settings() http.HandlerFunc {
	tmpl := templates.Must("account/settings.html")
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		vars := map[string]interface{}{
			"Enum": config.ProfileEnums,
		}

		// Load the current user in case of updates.
		user, err := session.CurrentUser(r)
		if err != nil {
			session.FlashError(w, r, "Couldn't get CurrentUser: %s", err)
			templates.Redirect(w, r.URL.Path)
			return
		}

		// Are we POSTing?
		if r.Method == http.MethodPost {
			intent := r.PostFormValue("intent")
			switch intent {
			case "profile":
				// Setting profile values.
				var (
					displayName = r.PostFormValue("display_name")
					dob         = r.PostFormValue("dob")
				)

				// Set user attributes.
				user.Name = &displayName
				if len(dob) > 0 {
					if birthdate, err := time.Parse("2006-01-02", dob); err != nil {
						session.FlashError(w, r, "Incorrect format for birthdate; should be in yyyy-mm-dd format but got: %s", dob)
					} else {
						// Validate birthdate is at least age 18.
						if utility.Age(birthdate) < 18 {
							session.FlashError(w, r, "Invalid birthdate: you must be at least 18 years old to use this site.")
							templates.Redirect(w, r.URL.Path)
							return
						}
						user.Birthdate = birthdate
					}
				} else {
					user.Birthdate = time.Time{}
				}

				// Set profile attributes.
				for _, attr := range config.ProfileFields {
					user.SetProfileField(attr, r.PostFormValue(attr))
				}

				// "Looking For" checkbox list.
				if hereFor, ok := r.PostForm["here_for"]; ok {
					user.SetProfileField("here_for", strings.Join(hereFor, ","))
				}

				if err := user.Save(); err != nil {
					session.FlashError(w, r, "Failed to save user to database: %s", err)
				}

				session.Flash(w, r, "Profile settings updated!")
			case "preferences":
				var (
					explicit = r.PostFormValue("explicit") == "true"
				)

				user.Explicit = explicit

				if err := user.Save(); err != nil {
					session.FlashError(w, r, "Failed to save user to database: %s", err)
				}

				session.Flash(w, r, "Website preferences updated!")
			case "settings":
				fallthrough
			default:
				session.FlashError(w, r, "Unknown POST intent value. Please try again.")
			}

			templates.Redirect(w, r.URL.Path)
			return
		}

		if err := tmpl.Execute(w, r, vars); err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}
	})
}