package handlers

import (
	"net/http"
	"net/url"

	"amnezia-share/internal/models"
	"amnezia-share/internal/web"
)

type configRow struct {
	models.ShareCreation
	LinkID    int
	LinkToken string
}

type adminConfigsView struct {
	adminLayout
	Rows           []configRow
	LinkIDFilter   int
	ServerIDFilter int
	Truncated      bool
}

const adminConfigsMax = 300

// AdminConfigsGet lists guest-created panel connections (optionally scoped to
// one link or server) with a delete action (admin/server_configs.php).
func AdminConfigsGet(a *web.App) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		ctx := r.Context()
		ok, errText := flashFromQuery(r)
		view := adminConfigsView{
			adminLayout:    newAdminLayout(a, r, "configs"),
			LinkIDFilter:   queryInt(r, "link_id", 0),
			ServerIDFilter: queryInt(r, "server_id", 0),
		}
		view.OK, view.Error = ok, errText

		add := func(linkID int, token string, creations []models.ShareCreation) {
			for _, c := range creations {
				if view.ServerIDFilter > 0 && c.ServerID != view.ServerIDFilter {
					continue
				}
				if len(view.Rows) >= adminConfigsMax {
					view.Truncated = true
					return
				}
				view.Rows = append(view.Rows, configRow{ShareCreation: c, LinkID: linkID, LinkToken: token})
			}
		}

		if view.LinkIDFilter > 0 {
			if link, err := a.Share.LinkByID(ctx, view.LinkIDFilter); err == nil && link != nil {
				creations, _ := a.Share.ListCreationsForLink(ctx, link.ID)
				add(link.ID, link.Token, creations)
			}
		} else {
			links, err := a.Share.ListLinks(ctx, 1, 50, "")
			if err != nil {
				view.Error = err.Error()
			}
			for _, l := range links {
				creations, _ := a.Share.ListCreationsForLink(ctx, l.ID)
				add(l.ID, l.Token, creations)
				if view.Truncated {
					break
				}
			}
		}

		a.Render(w, r, "page_admin_configs", view)
	}
}

// AdminConfigsPost deletes a single guest connection (from the panel, then the
// DB).
func AdminConfigsPost(a *web.App) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		ctx := r.Context()
		var err error
		var okMsg string

		switch r.FormValue("action") {
		case "delete_creation":
			linkID := formInt(r, "link_id", 0)
			creationID := formInt64(r, "creation_id", 0)
			err = a.Share.SoftDeleteCreation(ctx, a.Panel, a.Settings, linkID, creationID)
			if err == nil {
				okMsg = "Конфигурация удалена."
			}
		default:
			err = errUnknownAction
		}

		back := "admin/configs"
		q := url.Values{}
		if v := r.FormValue("link_id"); v != "" {
			q.Set("link_id", v)
		}
		if v := r.FormValue("server_id_filter"); v != "" {
			q.Set("server_id", v)
		}
		if len(q) > 0 {
			back += "?" + q.Encode()
		}

		errText := ""
		if err != nil {
			errText = err.Error()
		}
		redirectWithFlash(w, r, a, back, okMsg, errText)
	}
}