package mutelist

import (
	"net/http"
	"strings"

	"code.nonshy.com/nonshy/website/pkg/config"
	"code.nonshy.com/nonshy/website/pkg/models"
	"code.nonshy.com/nonshy/website/pkg/session"
	"code.nonshy.com/nonshy/website/pkg/templates"
)

// Muted User list: view the list of muted accounts.
func MuteList() http.HandlerFunc {
	tmpl := templates.Must("account/mute_list.html")
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		currentUser, err := session.CurrentUser(r)
		if err != nil {
			session.FlashError(w, r, "Unexpected error: could not get currentUser.")
			templates.Redirect(w, "/")
			return
		}

		// Get our mutelist.
		pager := &models.Pagination{
			PerPage: config.PageSizeMuteList,
			Sort:    "updated_at desc",
		}
		pager.ParsePage(r)
		muted, err := models.PaginateMuteList(currentUser, pager)
		if err != nil {
			session.FlashError(w, r, "Couldn't paginate mute list: %s", err)
			templates.Redirect(w, "/")
			return
		}

		var vars = map[string]interface{}{
			"MutedUsers": muted,
			"Pager":      pager,
		}
		if err := tmpl.Execute(w, r, vars); err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}
	})
}

// AddUser to manually add someone to your mute list.
func AddUser() http.HandlerFunc {
	tmpl := templates.Must("account/mute_list_add.html")
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		// Query parameters.
		var (
			username = strings.ToLower(r.FormValue("username"))
			next     = r.FormValue("next")
			context  = models.MutedUserContext(r.FormValue("context"))
			listName = "Site Gallery" // TODO: more as contexts are added
		)

		// Validate the Next URL.
		if !strings.HasPrefix(next, "/") {
			next = "/users/muted"
		}

		// Validate acceptable contexts.
		if !models.IsValidMuteUserContext(context) {
			session.FlashError(w, r, "Unsupported mute context.")
			templates.Redirect(w, next)
			return
		}

		// Get the target user.
		user, err := models.FindUser(username)
		if err != nil {
			session.FlashError(w, r, "User Not Found")
			templates.Redirect(w, next)
			return
		}

		vars := map[string]interface{}{
			"User":         user,
			"Next":         next,
			"Context":      context,
			"MuteListName": listName,
		}
		if err := tmpl.Execute(w, r, vars); err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}
	})
}

// MuteUser controller: POST endpoint to add a mute.
func MuteUser() http.HandlerFunc {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		// Form fields
		var (
			username = strings.ToLower(r.PostFormValue("username"))
			next     = r.PostFormValue("next")
			context  = models.MutedUserContext(r.PostFormValue("context"))
			listName = "Site Gallery" // TODO: more as contexts are added
			unmute   = r.PostFormValue("unmute") == "true"
		)

		// Validate the Next URL.
		if !strings.HasPrefix(next, "/") {
			next = "/users/muted"
		}

		// Validate acceptable contexts.
		if !models.IsValidMuteUserContext(context) {
			session.FlashError(w, r, "Unsupported mute context.")
			templates.Redirect(w, "/")
			return
		}

		// Get the current user.
		currentUser, err := session.CurrentUser(r)
		if err != nil {
			session.FlashError(w, r, "Couldn't get CurrentUser: %s", err)
			templates.Redirect(w, "/")
			return
		}

		// Get the target user.
		user, err := models.FindUser(username)
		if err != nil {
			session.FlashError(w, r, "User Not Found")
			templates.Redirect(w, next)
			return
		}

		// Unmuting?
		if unmute {
			if err := models.RemoveMutedUser(currentUser.ID, user.ID, context); err != nil {
				session.FlashError(w, r, "Couldn't unmute this user: %s.", err)
			} else {
				session.Flash(w, r, "You have removed %s from your %s mute list.", user.Username, listName)

				// Log the change.
				models.LogDeleted(currentUser, nil, "muted_users", user.ID, "Unmuted user "+user.Username+" from "+listName+".", nil)
			}
			templates.Redirect(w, next)
			return
		}

		// Can't mute yourself.
		if currentUser.ID == user.ID {
			session.FlashError(w, r, "You can't mute yourself!")
			templates.Redirect(w, next)
			return
		}

		// Mute the target user.
		if err := models.AddMutedUser(currentUser.ID, user.ID, context); err != nil {
			session.FlashError(w, r, "Couldn't mute this user: %s.", err)
		} else {
			session.Flash(w, r, "You have added %s to your %s mute list.", user.Username, listName)

			// Log the change.
			models.LogCreated(currentUser, "muted_users", user.ID, "Mutes user "+user.Username+" on list "+listName+".")
		}

		templates.Redirect(w, next)
	})
}