/*
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"
	"strings"

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

type Searcher struct {
	id    string
	style tcell.Style

	x, y      int
	w, h      int
	active    bool
	visible   bool
	focusable bool

	title         string
	search        *Field
	data          []string
	filteredData  []string
	cursor        int
	disableBorder bool

	selectFunc   func(idx int, s string) bool
	hideOnSelect bool
	logger       func(string, ...any)

	keyMap KeyMap
}

var _ Widget = (*Searcher)(nil)

func NewSearcher(id string, style tcell.Style) *Searcher {
	ret := &Searcher{
		search: NewField(fmt.Sprintf("%s-searcher-field", id), style),
	}
	ret.Init(id, style)
	return ret
}

func (w *Searcher) Init(id string, style tcell.Style) {
	w.id = id
	w.style = style
	w.visible = true
	w.search.SetOnChange(func(prev, curr string) {
		w.updateFilter()
	})
	w.keyMap = NewKeyMap(map[tcell.Key]func(ev *tcell.EventKey) bool{
		tcell.KeyUp:    w.handleKeyUp,
		tcell.KeyDown:  w.handleKeyDown,
		tcell.KeyHome:  w.handleKeyHome,
		tcell.KeyEnd:   w.handleKeyEnd,
		tcell.KeyPgUp:  w.handleKeyPgUp,
		tcell.KeyPgDn:  w.handleKeyPgDn,
		tcell.KeyEnter: w.handleKeyEnter,
	})
	w.focusable = true
}

func (w *Searcher) Id() string { return w.id }
func (w *Searcher) HandleResize(ev *tcell.EventResize) {
	w.w, w.h = ev.Size()
	// Remove 2 from each for borders
	aW, aH := w.w-2, w.h-2
	if !w.disableBorder {
		aW, aH = aW-2, aH-2
	}
	w.search.SetPos(Coord{X: 1, Y: 1})
	w.search.HandleResize(Coord{X: aW, Y: aH}.ResizeEvent())
}

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

func (w *Searcher) HandleKey(ev *tcell.EventKey) bool {
	if !w.active {
		return false
	} else if ok := w.keyMap.Handle(ev); ok {
		return true
	}
	return w.search.HandleKey(ev)
}

func (w *Searcher) handleKeyUp(ev *tcell.EventKey) bool {
	if len(w.filteredData) == 0 {
		return false
	}
	w.cursor = ((w.cursor - 1) + len(w.filteredData)) % len(w.filteredData)
	return true
}

func (w *Searcher) handleKeyDown(ev *tcell.EventKey) bool {
	if len(w.filteredData) == 0 {
		return false
	}
	w.cursor = ((w.cursor + 1) + len(w.filteredData)) % len(w.filteredData)
	return true
}

func (w *Searcher) handleKeyHome(ev *tcell.EventKey) bool {
	if w.cursor == 0 {
		return false
	}
	w.cursor = 0
	return true
}

func (w *Searcher) handleKeyEnd(ev *tcell.EventKey) bool {
	if w.cursor == len(w.filteredData)-1 {
		return false
	}
	w.cursor = len(w.filteredData) - 1
	return true
}

func (w *Searcher) handleKeyPgUp(ev *tcell.EventKey) bool {
	if w.cursor == 0 {
		return false
	}
	w.cursor -= w.h
	if w.cursor < 0 {
		w.cursor = 0
	}

	return false
}

func (w *Searcher) handleKeyPgDn(ev *tcell.EventKey) bool {
	mx := len(w.filteredData) - 1
	if w.cursor == mx {
		return false
	}
	w.cursor += w.h
	if w.cursor > mx {
		w.cursor = mx
	}
	return false
}

func (w *Searcher) handleKeyEnter(ev *tcell.EventKey) bool {
	if w.hideOnSelect {
		w.visible = false
	}
	if w.selectFunc != nil {
		// Figure out our true index
		var idx int
		selV := w.filteredData[w.cursor]
		for i := range w.data {
			if w.data[i] == selV {
				idx = i
			}
		}
		return w.selectFunc(idx, selV)
	}
	return false
}

func (w *Searcher) HandleTime(ev *tcell.EventTime) { w.search.HandleTime(ev) }
func (w *Searcher) Draw(screen tcell.Screen) {
	if !w.visible {
		return
	}
	dStyle := w.style.Dim(!w.active)
	if !w.disableBorder {
		if len(w.title) > 0 {
			wh.TitledBorderFilled(w.x, w.y, w.x+w.w, w.y+w.h-1, w.title, wh.BRD_CSIMPLE, dStyle, screen)
		} else {
			wh.BorderFilled(w.x, w.y, w.x+w.w, w.y+w.h, wh.BRD_CSIMPLE, dStyle, screen)
		}
	} else if len(w.title) > 0 {
		// TODO: Output the label
	}
	w.GetPos().DrawOffset(w.search, screen)
	x, y := w.x+1, w.y+2
	var stIdx int
	if w.cursor > w.h/2 {
		stIdx = w.cursor - (w.h / 2)
	}
	fD := len(w.filteredData)
	if w.cursor+w.h/2 > fD {
		stIdx = fD - w.h/2
	}
	stIdx = wh.Max(stIdx, 0)
	for i := stIdx; i < fD; i++ {
		st := dStyle
		if i == w.cursor {
			st = st.Reverse(true)
		}
		wh.DrawText(x, y, w.filteredData[i], st, screen)
		y++
		if y >= w.y+w.h-1 {
			break
		}
	}
}

func (w *Searcher) Active() bool { return w.active }
func (w *Searcher) SetActive(a bool) {
	w.active = a
	w.search.SetActive(a)
}
func (w *Searcher) Visible() bool     { return w.visible }
func (w *Searcher) SetVisible(a bool) { w.visible = a }
func (w *Searcher) SetX(x int)        { w.x = x }
func (w *Searcher) SetY(y int)        { w.y = y }
func (w *Searcher) GetX() int         { return w.x }
func (w *Searcher) GetY() int         { return w.y }

func (w *Searcher) WantW() int {
	ret := 2 + w.search.WantW()
	var maxData int
	for i := range w.filteredData {
		maxData = wh.Max(maxData, len(w.filteredData[i]))
	}
	return ret + maxData
}

func (w *Searcher) WantH() int {
	ret := w.search.WantH() + len(w.filteredData)
	if !w.disableBorder {
		return ret + 2
	}
	return ret
}

func (w *Searcher) GetPos() Coord       { return Coord{X: w.x, Y: w.y} }
func (w *Searcher) SetPos(c Coord)      { w.x, w.y = c.X, c.Y }
func (w *Searcher) SetW(x int)          { w.w = x }
func (w *Searcher) SetH(y int)          { w.h = y }
func (w *Searcher) GetW() int           { return w.w }
func (w *Searcher) GetH() int           { return w.h }
func (w *Searcher) SetSize(c Coord)     { w.w, w.h = c.X, c.Y }
func (w *Searcher) Focusable() bool     { return w.focusable }
func (w *Searcher) SetFocusable(b bool) { w.focusable = b }
func (w *Searcher) MinW() int {
	return 2 + w.search.MinW()
}

func (w *Searcher) MinH() int {
	return 2 + w.search.MinH() + 5
}

func (w *Searcher) SetHideOnSelect(t bool) { w.hideOnSelect = t }
func (w *Searcher) SetTitle(ttl string)    { w.title = ttl }
func (w *Searcher) SetData(data []string) {
	// w.data = data
	w.data = data
	w.filteredData = data
	w.updateFilter()
}

func (w *Searcher) updateFilter() {
	var selVal string
	data := []string{}
	copy(data, w.filteredData)
	if len(data) > 0 && len(data) > w.cursor {
		selVal = data[w.cursor]
	}
	filter := w.search.Value()
	cS := filter != strings.ToLower(filter)
	w.filteredData = []string{}
	for i := range w.data {
		if cS {
			if strings.Contains(w.data[i], filter) {
				w.filteredData = append(w.filteredData, w.data[i])
			}
		} else {
			if strings.Contains(strings.ToLower(w.data[i]), filter) {
				w.filteredData = append(w.filteredData, w.data[i])
			}
		}
	}
	for i := range w.filteredData {
		if w.filteredData[i] == selVal {
			w.cursor = i
			return
		}
	}
	if w.cursor > len(w.filteredData) {
		w.cursor = len(w.filteredData) - 1
		return
	}
	w.cursor = 0
}

func (w *Searcher) SelectedValue() string { return w.filteredData[w.cursor] }
func (w *Searcher) SelectedIndex() int    { return w.cursor }

func (w *Searcher) SetSearchValue(val string) {
	w.search.SetValue(val)
}

func (w *Searcher) SetSelectFunc(f func(idx int, s string) bool) {
	w.selectFunc = f
}

func (w *Searcher) ClearSearch() {
	w.cursor = 0
	w.filteredData = w.data
	w.search.SetValue("")
}

func (w *Searcher) SetLogger(l func(string, ...any)) { w.logger = l }
func (w *Searcher) Log(txt string, args ...any) {
	if w.logger != nil {
		w.logger(txt, args...)
	}
}

func (w *Searcher) DisableBorder(b bool) { w.disableBorder = b }