/*
Copyright © Brian Buller <brian@bullercodeworks.com>

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/
package widgets

import (
	"fmt"
	"time"

	wh "git.bullercodeworks.com/brian/tcell-widgets/helpers"
	"github.com/gdamore/tcell"
)

// TODO: Fix this, it's not drawing correctly.
type TimeField struct {
	id        string
	label     string
	style     tcell.Style
	active    bool
	visible   bool
	focusable bool

	x, y int
	w, h int

	yr, mo, dy int
	hr, mn, sc int

	value      time.Time
	dateFormat string

	fldYear   *Field
	fldMonth  *Field
	fldDay    *Field
	fldHour   *Field
	fldMinute *Field
	fldSecond *Field
	btnNow    *Button

	widgets []Widget

	cursor int
	keyMap KeyMap
}

// TODO: Allow changing the format.
// For now it's just yyyy-mm-dd hh:mm:ss

var _ Widget = (*TimeField)(nil)

func NewTimeField(id string, style tcell.Style) *TimeField {
	ret := &TimeField{style: style}
	ret.Init(id, style)
	return ret
}

func (w *TimeField) Init(id string, style tcell.Style) {
	w.id = id
	w.style = style
	w.fldYear = NewField(fmt.Sprintf("%s.fldyear", id), style)
	w.fldMonth = NewField(fmt.Sprintf("%s.fldmonth", id), style)
	w.fldDay = NewField(fmt.Sprintf("%s.fldday", id), style)
	w.fldHour = NewField(fmt.Sprintf("%s.fldhour", id), style)
	w.fldMinute = NewField(fmt.Sprintf("%s.fldminute", id), style)
	w.fldSecond = NewField(fmt.Sprintf("%s.fldsecond", id), style)
	w.btnNow = NewButton(fmt.Sprintf("%s.btnnow", id), style)
	w.widgets = append(w.widgets,
		w.fldYear, w.fldMonth, w.fldDay,
		w.fldHour, w.fldMinute, w.fldSecond, w.btnNow,
	)

	w.keyMap = NewKeyMap(map[tcell.Key]func(ev *tcell.EventKey) bool{
		tcell.KeyHome: w.handleHome,
		tcell.KeyEnd:  w.handleEnd,
	})
	w.visible = true
	w.focusable = true
}

func (w *TimeField) Id() string { return w.id }
func (w *TimeField) HandleResize(ev *tcell.EventResize) {
	w.w, w.h = ev.Size()
	if w.w > w.WantW() {
		w.w = w.WantW()
	}
	if w.h > w.WantH() {
		w.h = w.WantH()
	}
	x, y := w.x+1, w.y
	if len(w.label) > 0 {
		y += 1
	}
	if w.fldYear.Visible() {
		w.fldYear.SetPos(Coord{X: x, Y: y})
		w.fldYear.SetSize(Coord{X: 4, Y: 1})
		x += 5 // year + '-'
		w.fldMonth.SetPos(Coord{X: x, Y: y})
		w.fldMonth.SetSize(Coord{X: 2, Y: 1})
		x += 3 // month + '-'
		w.fldDay.SetPos(Coord{X: x, Y: y})
		w.fldDay.SetSize(Coord{X: 2, Y: 1})
		x += 3 // day + ' '
	}
	if w.fldHour.Visible() {
		w.fldHour.SetPos(Coord{X: x, Y: y})
		w.fldHour.SetSize(Coord{X: 2, Y: 1})
		x += 3 // hour + ':'
		w.fldMinute.SetPos(Coord{X: x, Y: y})
		w.fldMinute.SetSize(Coord{X: 2, Y: 1})
		x += 3 // mm + ':' or ' '
		if w.fldSecond.Visible() {
			w.fldSecond.SetPos(Coord{X: x, Y: y})
			w.fldSecond.SetSize(Coord{X: 2, Y: 1})
			x += 3 // ss + ' '
		}
	}
	if w.btnNow.Visible() {
		w.btnNow.SetPos(Coord{X: x, Y: y})
		w.btnNow.SetSize(Coord{X: 7, Y: 1})
	}
}

func (w *TimeField) SetKeyMap(km KeyMap)   { w.keyMap = km }
func (w *TimeField) AddToKeyMap(km KeyMap) { w.keyMap.Merge(km) }
func (w *TimeField) RemoveFromKeyMap(km KeyMap) {
	for k := range km.Keys {
		w.keyMap.Remove(k)
	}
	for r := range km.Runes {
		w.keyMap.RemoveRune(r)
	}
}

func (w *TimeField) HandleKey(ev *tcell.EventKey) bool {
	if !w.active {
		return false
	} else if ev.Key() == tcell.KeyTab {
		return w.handleTab(ev)
	} else if w.keyMap.Handle(ev) {
		return true
	} else if w.cursor <= len(w.widgets) {
		return w.widgets[w.cursor].HandleKey(ev)
	}
	return false
}

func (w *TimeField) HandleTime(ev *tcell.EventTime) {
	for _, wd := range []Widget{
		w.fldYear, w.fldMonth, w.fldDay, w.fldHour,
		w.fldMinute, w.fldSecond, w.btnNow,
	} {
		wd.HandleTime(ev)
	}
}

func (w *TimeField) Draw(screen tcell.Screen) {
	if !w.visible {
		return
	}
	dS := w.style.Dim(!w.active)
	if len(w.label) > 0 {
		wh.TitledBorderFilled(w.x, w.y, w.x+w.w, w.y+w.h, w.label, wh.BRD_SIMPLE, dS, screen)
	} else {
		wh.BorderFilled(w.x, w.y, w.x+w.w, w.y+w.h, wh.BRD_SIMPLE, dS, screen)
	}
	pos := w.GetPos()
	for _, wd := range w.widgets {
		pos.DrawOffset(wd, screen)
	}
}

func (w *TimeField) Active() bool        { return w.active }
func (w *TimeField) SetActive(a bool)    { w.active = a }
func (w *TimeField) Visible() bool       { return w.visible }
func (w *TimeField) SetVisible(a bool)   { w.visible = a }
func (w *TimeField) SetX(x int)          { w.x = x }
func (w *TimeField) SetY(y int)          { w.y = y }
func (w *TimeField) GetX() int           { return w.x }
func (w *TimeField) GetY() int           { return w.y }
func (w *TimeField) GetPos() Coord       { return Coord{X: w.x, Y: w.y} }
func (w *TimeField) SetPos(c Coord)      { w.x, w.y = c.X, c.Y }
func (w *TimeField) SetW(x int)          { w.w = x }
func (w *TimeField) SetH(y int)          { w.h = y }
func (w *TimeField) GetW() int           { return w.w }
func (w *TimeField) GetH() int           { return w.y }
func (w *TimeField) SetSize(c Coord)     { w.w, w.h = c.X, c.Y }
func (w *TimeField) Focusable() bool     { return w.focusable }
func (w *TimeField) SetFocusable(b bool) { w.focusable = b }
func (w *TimeField) WantW() int          { return w.MinW() }
func (w *TimeField) WantH() int          { return w.MinH() }
func (w *TimeField) MinW() int {
	wdt := 0
	if w.fldYear.Visible() {
		wdt = 10 // yyyy-mm-dd
	}
	if w.fldSecond.Visible() {
		if wdt > 10 {
			wdt += 1
		}
		wdt += 8 // hh:mm:ss
	} else if w.fldHour.Visible() {
		if wdt > 10 {
			wdt += 1
		}
		wdt += 5 // hh:mm
	}
	if w.btnNow.Visible() {
		wdt += w.btnNow.MinW()
	}
	return wdt
}
func (w *TimeField) MinH() int { return 3 }

func (w *TimeField) SetLabel(lbl string)  { w.label = lbl }
func (w *TimeField) SetTime(tm time.Time) { w.value = tm }

func (w *TimeField) SetHasTime(hrmn, sec bool) {
	w.fldHour.SetVisible(hrmn)
	w.fldMinute.SetVisible(hrmn)
	w.fldSecond.SetVisible(hrmn && sec)
}

func (w *TimeField) SetHasDate(b bool) {
	w.fldYear.SetVisible(b)
	w.fldMonth.SetVisible(b)
	w.fldDay.SetVisible(b)
}

func (w *TimeField) SetHasNowBtn(b bool) { w.btnNow.SetVisible(b) }

func (w *TimeField) SetValue(v time.Time) { w.value = v }
func (w *TimeField) Value() time.Time     { return w.value }

func (w *TimeField) handleTab(ev *tcell.EventKey) bool {
	if !w.visible {
		return false
	}
	beg := w.cursor
	w.cursor += 1
	for !w.widgets[w.cursor].Visible() && w.cursor != beg {
		w.cursor += 1
	}
	for idx, wd := range w.widgets {
		wd.SetActive(idx == w.cursor)
	}
	if w.cursor != beg { // we didn't actually change
		return false
	} else if w.cursor < beg { // we looped
		return false
	}
	return true
}

func (w *TimeField) handleHome(ev *tcell.EventKey) bool {
	if !w.visible {
		return false
	}
	for i := 0; i < len(w.widgets); i++ {
		if w.widgets[i].Visible() {
			w.cursor = i
			w.updateActive()
			return true
		}
	}
	return false
}

func (w *TimeField) handleEnd(ev *tcell.EventKey) bool {
	if !w.visible {
		return false
	}
	for i := len(w.widgets) - 1; i >= 0; i-- {
		if w.widgets[i].Visible() {
			w.cursor = i
			w.updateActive()
			return true
		}
	}
	return false
}

func (w *TimeField) updateActive() {
	for idx, wd := range w.widgets {
		wd.SetActive(idx == w.cursor)
	}
}

func (w *TimeField) totalFields() int {
	var ret int
	for i := range w.widgets {
		if w.widgets[i].Visible() {
			ret += 1
		}
	}
	return ret
}