//
//  rhlibrary
//
//  The Radio Helsinki Rivendell Library
//
//
//  Copyright (C) 2016 Christian Pointner <equinox@helsinki.at>
//
//  This file is part of rhlibrary.
//
//  rhlibrary is free software: you can redistribute it and/or modify
//  it under the terms of the GNU General Public License as published by
//  the Free Software Foundation, either version 3 of the License, or
//  any later version.
//
//  rhlibrary is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//  GNU General Public License for more details.
//
//  You should have received a copy of the GNU General Public License
//  along with rhlibrary. If not, see <http://www.gnu.org/licenses/>.
//

package main

import (
	"sort"
	"sync"

	"code.helsinki.at/rhrd-go/player"
	"code.helsinki.at/rhrd-go/rddb"
	"github.com/gotk3/gotk3/glib"
	"github.com/gotk3/gotk3/gtk"
)

var (
	poolsMutex        sync.Mutex
	pools             rddb.PoolList
	poolsComboBox     *gtk.ComboBoxText
	poolsCurrentGroup string
)

func fetchPools(db *rddb.DBChan) (err error) {
	poolsMutex.Lock()
	defer poolsMutex.Unlock()

	if pools, err = db.GetPoolList(rhuser.Username); err != nil {
		return err
	}
	return
}

func updatePools(db *rddb.DBChan) (err error) {
	if err = fetchPools(db); err != nil {
		return
	}

	var keys []string
	for k, _ := range pools {
		keys = append(keys, k)
	}
	sort.Strings(keys)

	poolsComboBox.RemoveAll()
	for _, group := range keys {
		poolsComboBox.Append(group, pools[group].Description)
	}

	if !poolsComboBox.SetActiveID(poolsCurrentGroup) {
		poolsComboBox.SetActive(0)
	}
	return
}

func selectPool() rddb.PoolListEntry {
	id := poolsComboBox.GetActiveID()
	if id == "" {
		return rddb.PoolListEntry{}
	}
	poolsCurrentGroup = id

	poolsMutex.Lock()
	defer poolsMutex.Unlock()

	return pools[poolsCurrentGroup]
}

func addPoolComboBox(grid *gtk.Grid, db *rddb.DBChan, p *player.PlayerChan) (err error) {
	var box *gtk.Box
	if box, err = gtk.BoxNew(gtk.ORIENTATION_HORIZONTAL, 10); err != nil {
		return
	}

	var label *gtk.Label
	if label, err = gtk.LabelNew("Musik-Pool auswählen"); err != nil {
		return
	}
	box.PackStart(label, false, false, 0)

	if poolsComboBox, err = gtk.ComboBoxTextNew(); err != nil {
		return
	}
	if err = updatePools(db); err != nil {
		return err
	}
	poolsComboBox.Connect("changed", func(_ *gtk.ComboBoxText) {
		pool := selectPool()
		if pool.Group == "" {
			return
		}

		glib.IdleAdd(func() {
			if err = updatePoolCartListRows(pool, db, p); err != nil {
				rhdl.Printf("error loading pool carts for %s: %v", pool.Group, err)
				return
			}
		})
		rhdl.Printf("pool %s is now selected: %s", pool.Group, pool.Description)
	})

	box.PackStart(poolsComboBox, true, true, 0)
	box.SetHExpand(true)

	grid.Attach(box, 1, 1, 1, 1)
	return
}

func updatePoolCartListRows(pool rddb.PoolListEntry, db *rddb.DBChan, p *player.PlayerChan) (err error) {
	carts, err := db.GetPoolCartList(pool)
	if err != nil {
		return err
	}

	for num, cart := range carts {
		rhdl.Printf("Pool Cart [%d]: %+v", num, cart)
	}

	return
}

func getPoolsSelectorWidget(db *rddb.DBChan, p *player.PlayerChan) (gtk.IWidget, error) {
	grid, err := gtk.GridNew()
	if err != nil {
		return nil, err
	}
	grid.SetRowSpacing(25)
	grid.SetHExpand(true)
	grid.SetVExpand(true)

	if err = addPoolComboBox(grid, db, p); err != nil {
		return nil, err
	}
	// if err = addPoolCartList(grid, db, p); err != nil {
	// 	return nil, err
	// }

	var frame *gtk.Frame
	if frame, err = gtk.FrameNew(""); err != nil {
		return nil, err
	}
	if err = setCssStyle(&frame.Widget, ".frame { border: 0; padding: 25px 42px; }"); err != nil {
		return nil, err
	}

	frame.Add(grid)

	return frame, nil
}