package ui

import (
	"errors"
	"fmt"
	"strings"
	"time"

	"git.bullercodeworks.com/brian/gime/util"
	"git.bullercodeworks.com/brian/go-timertxt"
	"git.bullercodeworks.com/brian/wandle"
	"git.bullercodeworks.com/brian/widdles"
	"github.com/nsf/termbox-go"
)

const (
	activeToggleActive = iota
	activeToggleInactive
	activeToggleAll
	activeToggleErr
)

type listTimersScreen struct {
	ui *Ui

	initialized bool
	menu        *widdles.TopMenu
	scrollbar   *widdles.Scrollbar

	cursor int

	activeToggle int
	fullList     *timertxt.TimerList
	timerList    *timertxt.TimerList
	doneList     *timertxt.TimerList

	fullFilterList  *timertxt.TimerList
	timerFilterList *timertxt.TimerList
	doneFilterList  *timertxt.TimerList

	selected map[int]bool

	confirm *widdles.ConfirmDialog
	filter  string

	choiceMenu *widdles.MenuV
	tagEditor  *PromptForTagWiddle
	//partManager *PartManager

	msg string
	err error
}

type ListTimersMsg ScreenMsg

func NewListTimersMsg(data interface{}, err error) ListTimersMsg {
	return ListTimersMsg{
		source:  ListTimersId,
		command: CmdArchiveTimer,
		data:    data,
		err:     err,
	}
}

func NewListTimersScreen(u *Ui) *listTimersScreen {
	s := listTimersScreen{
		ui:        u,
		menu:      widdles.NewTopMenu(0, 0, 0),
		scrollbar: widdles.NewScrollbar(0, 0, 0, 0),
		selected:  make(map[int]bool),
		confirm:   widdles.NewConfirmDialog("", ""),

		choiceMenu: widdles.NewMenuV(0, 0, 0, 0),
		tagEditor:  NewPromptForTagWiddle(0, 0, widdles.AUTO_SIZE, widdles.AUTO_SIZE, "", ""),
	}
	return &s
}

func (s *listTimersScreen) Init() wandle.Cmd {
	if s.initialized {
		return nil
	}
	s.initialized = true
	// Set up the top menu
	fileMenu := s.menu.NewSubMenu("File")
	settingsOption := widdles.NewMenuItem("Settings")
	settingsOption.SetCommand(s.ui.GotoScreen(SettingsId))
	fileMenu.AddOption(settingsOption)
	quitOption := widdles.NewMenuItem("Quit")
	quitOption.SetHotkey(widdles.NewHotkey(termbox.KeyCtrlC))
	quitOption.SetCommand(func() wandle.Msg { return wandle.Quit() })
	fileMenu.AddOption(quitOption)
	s.menu.Measure()
	// Timer Lists
	s.timerList, s.doneList = s.ui.program.TimerList, s.ui.program.DoneList
	s.fullList = timertxt.NewTimerList()
	s.fullList.AddTimers(s.timerList.GetTimerSlice())
	s.fullList.AddTimers(s.doneList.GetTimerSlice())
	s.timerFilterList, s.doneFilterList = s.timerList, s.doneList
	s.timerFilterList.Sort(timertxt.SortStartDateDesc)
	s.doneFilterList.Sort(timertxt.SortStartDateDesc)
	s.updateFullFilterList()
	w, h := termbox.Size()
	s.choiceMenu.SetBorder(wandle.BRD_CSIMPLE)
	s.choiceMenu.SetX((w / 2) - 7)
	s.choiceMenu.SetY((h / 2) - 7)
	s.choiceMenu.SetWidth(widdles.AUTO_SIZE)
	s.choiceMenu.SetHeight(widdles.AUTO_SIZE)
	s.choiceMenu.SetPadding(0, 1, 0, 1)
	s.tagEditor.SetX(w / 4)
	s.tagEditor.SetY(h / 4)
	s.tagEditor.SetWidth(w / 2)
	s.tagEditor.SetHeight(h / 2)
	s.confirm.EnableHotkeys()
	s.confirm.SetX(w / 4)
	s.confirm.SetY(h / 4)
	s.confirm.SetWidth(w / 2)
	s.confirm.SetHeight(h / 2)
	s.updateFullFilterList()

	return nil
}

func (s *listTimersScreen) Update(msg wandle.Msg) wandle.Cmd {
	switch msg := msg.(type) {
	case ScreenMsg:
		s.err = msg.err
	case termbox.Event:
		return s.handleTermboxEvent(msg)
	}
	return nil
}

func (s *listTimersScreen) View(style wandle.Style) {
	_, h := termbox.Size()
	y := 2
	printedTimers := 0
	if s.activeToggle == activeToggleAll || s.activeToggle == activeToggleActive {
		wandle.Print(1, y, style.Bold(true), "Active Timers")
		y++
		for idx, tmr := range s.timerFilterList.GetTimerSlice() {
			if y > h-2 {
				break
			}
			st := style
			if s.cursor == idx {
				st = st.Invert()
			}
			if s.selected[idx] {
				wandle.Print(1, y, st, "[✔] ")
			} else {
				wandle.Print(1, y, st, "[ ] ")
			}
			s.ViewTimer(5, y, st, tmr)
			y++
		}
		y++
		printedTimers = s.timerFilterList.Size()
	}
	if s.activeToggle == activeToggleAll || s.activeToggle == activeToggleInactive {
		wandle.Print(1, y, style.Bold(true), "Done Timers")
		y++
		for idx, tmr := range s.doneFilterList.GetTimerSlice() {
			if y > h-3 {
				break
			}
			st := style
			if s.cursor == printedTimers+idx {
				st = st.Invert()
			}
			if s.selected[printedTimers+idx] {
				wandle.Print(1, y, st, "[✔] ")
			} else {
				wandle.Print(1, y, st, "[ ] ")
			}
			s.ViewTimer(5, y, st, tmr)
			y++
		}
	}
	selectedStatus := fmt.Sprintf("%s", s.getSelectedTimerDuration())
	if len(s.selected) > 0 {
		selectedStatus = fmt.Sprintf("%s (%d / %d selected)", selectedStatus, len(s.selected), s.fullFilterList.Size())
	}
	wandle.Print(1, h-2, style, selectedStatus)
	var archiveText string
	if s.areSelectedInSameList() {
		if s.areSelectedInDoneList() {
			archiveText = "Un[A]rchive Selected, "
		} else {
			archiveText = "[A]rchive Selected, "
		}
	} else {
		archiveText = "Not in Same List"
	}
	help := fmt.Sprintf("[T]oggle Display, [p]roject(+), [c]ontext(@), [t]ags(:), %s[Ctrl+A]: Select All/None, [Ctrl+I]: Invert Selection", archiveText)
	wandle.Print(1, h-1, style, help)

	s.scrollbar.View(style)
	if s.menu.IsActive() {
		s.menu.View(style)
	}
	if s.choiceMenu.IsActive() {
		s.choiceMenu.View(style)
	}
	if s.tagEditor.IsActive() {
		s.tagEditor.View(style)
	}
	if s.confirm.IsActive() {
		s.confirm.View(style)
	}
	wandle.Print(1, h-3, style, s.msg)
	if s.err != nil {
		wandle.Print(1, h-4, ErrStyle, s.err.Error())
	}
}

func (s *listTimersScreen) ViewTimer(x, y int, style wandle.Style, tmr *timertxt.Timer) {
	var tags []string
	for _, k := range util.SortedTagKeyList(tmr.AdditionalTags) {
		tags = append(tags, fmt.Sprintf("%s:%s", k, tmr.AdditionalTags[k]))
	}
	wandle.Print(x, y, style, fmt.Sprintf("%s %s %s %s %s", tmr.StartDate.Format(time.Stamp), tmr.Duration(), tmr.Contexts, tmr.Projects, strings.Join(tags, "; ")))
}

func (s *listTimersScreen) handleTermboxEvent(msg termbox.Event) wandle.Cmd {
	if s.confirm.IsActive() {
		return s.confirm.Update(msg)
	}
	if s.choiceMenu.IsActive() {
		if msg.Type == termbox.EventKey && msg.Key == termbox.KeyEsc {
			s.choiceMenu.SetActive(false)
			return wandle.EmptyCmd
		} else {
			return s.choiceMenu.Update(msg)
		}
	}
	if s.tagEditor.IsActive() {
		return s.tagEditor.Update(msg)
	}
	if (msg.Type == termbox.EventKey && msg.Key == termbox.KeyEsc) || s.menu.IsActive() {
		return s.menu.Update(msg)
	}
	switch msg.Type {
	case termbox.EventKey:
		if msg.Key == termbox.KeyEnter {
			// TODO: Edit the entry
			/*
				if s.cursor >= 0 && s.cursor < s.timerFilterList.Size()+s.doneFilterList.Size() {
				} else {
				}
			*/
		} else if msg.Key == termbox.KeySpace {
			// (un)Select the entry
			if v := s.selected[s.cursor]; v {
				delete(s.selected, s.cursor)
			} else {
				s.selected[s.cursor] = true
			}
			if s.cursor < s.fullFilterList.Size()-1 {
				s.cursor++
			}
		} else if msg.Ch == 'T' {
			s.activeToggle = (s.activeToggle + 1) % activeToggleErr
			s.updateFullFilterList()
		} else if msg.Ch == 'A' {
			return s.showArchiveSelected()
		} else if msg.Key == termbox.KeyArrowUp || msg.Ch == 'k' {
			if s.cursor > 0 {
				s.cursor--
			} else {
				s.cursor = 0
			}
			return nil
		} else if msg.Key == termbox.KeyArrowDown || msg.Ch == 'j' {
			if s.cursor < s.fullFilterList.Size()-1 {
				s.cursor++
			} else {
				s.cursor = s.fullFilterList.Size() - 1
			}
			return nil
		} else if msg.Ch == 'G' {
			s.cursor = s.fullFilterList.Size() - 1
		} else if msg.Ch == 'g' {
			s.cursor = 0
		} else if msg.Ch == 't' {
			// Edit tag(s)
			return s.showEditTagsChoice()
		} else if msg.Ch == 'p' {
			// Edit project(s)
			// TODO: Prompt for Choice: Add/Edit/Remove
			projs := s.fullList.GetProjects()
			_ = projs
		} else if msg.Ch == 'c' {
			// Edit context(s)
			// TODO: Prompt for choice: Add/Edit/Remove
			ctxts := s.fullList.GetContexts()
			_ = ctxts
		} else if msg.Key == termbox.KeyCtrlA {
			if len(s.selected) != s.fullFilterList.Size() {
				// Select None
				for k := range s.selected {
					delete(s.selected, k)
				}
			} else {
				// Select All
				for i := 0; i < s.fullFilterList.Size(); i++ {
					s.selected[i] = true
				}
			}
			for i := 0; i < s.fullFilterList.Size(); i++ {
				if v := s.selected[i]; v {
					delete(s.selected, i)
				} else {
					s.selected[i] = true
				}
			}
		} else if msg.Key == termbox.KeyCtrlI {
			for i := 0; i < s.fullFilterList.Size(); i++ {
				if v := s.selected[i]; v {
					delete(s.selected, i)
				} else {
					s.selected[i] = true
				}
			}
		}
	}
	return nil
}

func (s *listTimersScreen) showArchiveSelected() wandle.Cmd {
	return func() wandle.Msg {
		if len(s.selected) > 0 {
			s.confirm.SetTitle(fmt.Sprintf("Archive %d Timers?", len(s.selected)))
			s.confirm.SetMessage("Are you sure you want to archive these timers? (y/n)")
		} else {
			s.confirm.SetTitle("Archive Timer?")
			s.confirm.SetMessage("Are you sure you want to archive this timer? (y/n)")
		}
		s.confirm.SetOkCommand(func() wandle.Msg {
			s.confirm.SetVisible(false)
			return s.doArchiveSelected()
		})
		s.confirm.SetCancelCommand(func() wandle.Msg {
			s.confirm.SetVisible(false)
			return wandle.EmptyCmd
		})
		s.confirm.SetVisible(true)
		return nil
	}
}
func (s *listTimersScreen) doArchiveSelected() wandle.Cmd {
	archiveTimer := func(t *timertxt.Timer) error {
		if remErr := s.timerList.RemoveTimer(*t); remErr != nil {
			return remErr
		}
		s.doneList.AddTimer(t)
		return nil
	}
	selected := len(s.selected)
	if selected == 0 {
		if s.cursor < s.fullFilterList.Size() {
			var selTimer *timertxt.Timer
			if selTimer, s.err = s.fullFilterList.GetTimer(s.cursor); s.err == nil {
				if archErr := archiveTimer(selTimer); archErr != nil {
					s.err = archErr
					return wandle.EmptyCmd
				}
			}
		}
	} else {
		for i := range s.selected {
			if tmr, err := s.fullFilterList.GetTimer(i); err == nil {
				if err := archiveTimer(tmr); err != nil {
					s.err = err
					return wandle.EmptyCmd
				}
			}
		}
	}
	return wandle.EmptyCmd
}

func (s *listTimersScreen) showEditTagsChoice() wandle.Cmd {
	tags := s.getSelectedTimerTags()
	var showTagEditor = func(key, val string, multival bool) wandle.Cmd {
		return func() wandle.Msg {
			s.tagEditor.SetTag(key, val)
			s.tagEditor.SetDoneCommand(func() wandle.Msg {
				s.updateTagOnSelectedTimers(s.tagEditor.GetTag())
				s.tagEditor.Done()
				return nil
			})
			s.tagEditor.SetCancelCommand(func() wandle.Msg {
				s.tagEditor.SetActive(false)
				return nil
			})
			s.choiceMenu.SetActive(false)
			s.tagEditor.SetActive(true)
			s.tagEditor.SetMultiVal(multival)
			return wandle.EmptyCmd
		}
	}
	s.choiceMenu.SetTitle("")
	s.choiceMenu.ClearOptions()
	addTag := widdles.NewMenuItem("[A]dd New Tag")
	addTag.SetHotkey(widdles.NewHotkeyCh('a'))
	addTag.SetCommand(showTagEditor("", "", false))
	s.choiceMenu.AddOption(addTag)
	editTag := widdles.NewMenuItem("[E]dit Tag")
	editTag.SetHotkey(widdles.NewHotkeyCh('e'))
	editTag.SetEnabled(len(tags) > 0)
	editTag.SetCommand(func() wandle.Msg {
		s.choiceMenu.ClearOptions()
		s.choiceMenu.SetTitle("Choose Tag to Edit")
		for k, v := range tags {
			var vals string
			var multival bool
			if len(v) == 1 {
				vals = v[0]
			} else {
				vals = ""
				multival = true
			}
			opt := widdles.NewMenuItem(fmt.Sprintf("%s (%s)", k, vals))
			opt.SetCommand(showTagEditor(k, vals, multival))
			s.choiceMenu.AddOption(opt)
		}
		return wandle.EmptyCmd
	})
	s.choiceMenu.AddOption(editTag)
	removeTag := widdles.NewMenuItem("[R]emove Tag")
	removeTag.SetHotkey(widdles.NewHotkeyCh('r'))
	removeTag.SetCommand(func() wandle.Msg {
		s.choiceMenu.ClearOptions()
		s.choiceMenu.SetTitle("Choose Tag to Remove")
		for k, v := range tags {
			opt := widdles.NewMenuItem(fmt.Sprintf("%s: %s", k, v))
			opt.SetCommand(func() wandle.Msg {
				s.removeTagOnSelectedTimers(k)
				return wandle.EmptyCmd
			})
			s.choiceMenu.AddOption(opt)
		}
		s.choiceMenu.SetActive(true)
		return wandle.EmptyCmd
	})
	s.choiceMenu.AddOption(removeTag)
	s.choiceMenu.SetActive(true)
	return wandle.EmptyCmd
}

func (s *listTimersScreen) updateFullFilterList() {
	s.fullFilterList = timertxt.NewTimerList()
	switch s.activeToggle {
	case activeToggleAll:
		s.fullFilterList.Combine(s.timerFilterList)
		s.fullFilterList.Combine(s.doneFilterList)
	case activeToggleActive:
		s.fullFilterList.Combine(s.timerFilterList)
	case activeToggleInactive:
		s.fullFilterList.Combine(s.doneFilterList)
	}
	if s.cursor >= s.fullFilterList.Size() {
		s.cursor = s.fullFilterList.Size() - 1
	}
}

func (s *listTimersScreen) gotoSettingsScreen() wandle.Msg {
	return ScreenMsg{
		source:  ListTimersId,
		command: CmdGotoSettings,
	}
}

// Writes the lists through the program, putting errors in s.err
func (s *listTimersScreen) writeLists() {
	var errText string
	if err := s.ui.program.WriteLists(); err != nil {
		errText = fmt.Sprintf("Errors Writing Lists (%v)", err)
	}
	if len(errText) > 0 {
		s.err = errors.New(errText)
	}
}
func (s *listTimersScreen) getSelectedTimers() []*timertxt.Timer {
	var ret []*timertxt.Timer
	selected := len(s.selected)
	if selected == 0 {
		if s.cursor < s.fullFilterList.Size() {
			var selTimer *timertxt.Timer
			if selTimer, s.err = s.fullFilterList.GetTimer(s.cursor); s.err == nil {
				ret = append(ret, selTimer)
			}
		}
	} else {
		for i := range s.selected {
			if tmr, err := s.fullFilterList.GetTimer(i); err == nil {
				ret = append(ret, tmr)
			}
		}
	}
	return ret
}
func (s *listTimersScreen) getSelectedTimerTags() map[string][]string {
	ret := make(map[string][]string)
	sel := s.getSelectedTimers()
	for _, tmr := range sel {
		for k, v := range tmr.AdditionalTags {
			ret[k] = util.AppendStringIfDistinct(ret[k], v)
		}
	}
	return ret
}
func (s *listTimersScreen) updateTagOnSelectedTimers(key, val string) {
	sel := s.getSelectedTimers()
	for _, tmr := range sel {
		tmr.AdditionalTags[key] = val
	}
	s.writeLists()
}
func (s *listTimersScreen) removeTagOnSelectedTimers(key string) {
	sel := s.getSelectedTimers()
	for _, tmr := range sel {
		if _, ok := tmr.AdditionalTags[key]; ok {
			delete(tmr.AdditionalTags, key)
		}
	}
	s.writeLists()
}
func (s *listTimersScreen) getSelectedTimerProjects() []string {
	var ret []string
	sel := s.getSelectedTimers()
	for _, tmr := range sel {
		for _, v := range tmr.Contexts {
			ret = util.AppendStringIfDistinct(ret, v)
		}
	}
	return ret
}
func (s *listTimersScreen) getSelectedTimerContexts() []string {
	var ret []string
	sel := s.getSelectedTimers()
	for _, tmr := range sel {
		for _, v := range tmr.Contexts {
			ret = util.AppendStringIfDistinct(ret, v)
		}
	}
	return ret
}
func (s *listTimersScreen) getSelectedTimerDuration() time.Duration {
	sel := s.getSelectedTimers()
	var ret time.Duration
	for _, tmr := range sel {
		ret = util.AddDurations(ret, util.Round(tmr.Duration()))
	}
	return ret
}

// Returns true if all selected timers are done
func (s *listTimersScreen) areSelectedInDoneList() bool {
	sel := s.getSelectedTimers()
	for i := range sel {
		if s.timerList.Contains(sel[i]) {
			return false
		}
	}
	return true
}

// Return true if all selected timers are from the same list (file)
func (s *listTimersScreen) areSelectedInSameList() bool {
	sel := s.getSelectedTimers()
	var inActive, inDone int
	for i := range sel {
		if s.timerList.Contains(sel[i]) {
			inActive++
		}
		if s.doneList.Contains(sel[i]) {
			inDone++
		}
	}
	return inActive == 0 || inDone == 0
}