package editor

import (
	"timshome.page/gilo/editor/highlight"
	"timshome.page/gilo/internal/gilo"
	"timshome.page/gilo/key"
)

type search struct {
	cursor      *gilo.Point
	offset      *gilo.Point
	savedhlLine int
	savedhl     []int
	direction   int
	lastMatch   int
}

func newSearch() *search {
	return &search{
		cursor:      gilo.DefaultPoint(),
		offset:      gilo.DefaultPoint(),
		savedhlLine: -1,
		savedhl:     []int{},
		lastMatch:   -1,
		direction:   1,
	}
}

func (e *Editor) find() {
	e.search.cursor.X = e.cursor.X
	e.search.cursor.Y = e.cursor.Y
	e.search.offset.X = e.offset.X
	e.search.offset.Y = e.offset.Y

	query := e.prompt("Search: %s (Use ESC/Arrows/Enter)", e.findCallback)

	if query == "" {
		e.cursor.X = e.search.cursor.X
		e.cursor.Y = e.search.cursor.Y
		e.offset.X = e.search.offset.X
		e.offset.Y = e.search.offset.Y

		return
	}
}

func (e *Editor) findCallback(query string, ch string) {
	// If we highlighted a previous match, restore the original highlighting
	if e.search.savedhlLine != -1 && e.search.savedhl != nil {
		staleRow := e.doc.GetRow(e.search.savedhlLine)
		for i, val := range e.search.savedhl {
			staleRow.Hl[i] = val
		}
		e.search.savedhl = nil
		e.search.savedhlLine = -1
	}

	if ch == string(key.Enter) || ch == string(key.Esc) {
		e.search.lastMatch = -1
		e.search.direction = 1
		return
	} else if ch == keyRight || ch == keyDown {
		e.search.direction = 1
	} else if ch == keyLeft || ch == keyUp {
		e.search.direction = -1
	} else {
		e.search.lastMatch = -1
		e.search.direction = 1
	}

	if e.search.lastMatch == -1 {
		e.search.direction = 1
	}

	if len(query) == 0 {
		return
	}

	current := e.search.lastMatch

	for i := 0; i < e.doc.RowCount(); i++ {
		current += e.search.direction

		if current == -1 {
			current = e.doc.RowCount() - 1
		} else if current == e.doc.RowCount() {
			current = 0
		}

		row := e.doc.GetRow(current)
		matchIndex := row.Search(query)
		if matchIndex == -1 {
			continue
		}

		e.search.lastMatch = current
		e.cursor.Y = current
		e.cursor.X = row.RenderXtoCursorX(matchIndex)
		e.offset.Y = e.doc.RowCount()

		// Save the current highlighting of where the search result is
		e.search.savedhlLine = current
		e.search.savedhl = make([]int, row.RenderSize())
		for i, val := range row.Hl {
			e.search.savedhl[i] = val
		}

		// Update highlighting of search result
		for x := matchIndex; x < matchIndex+len(query); x++ {
			row.Hl[x] = highlight.Match
		}

		break
	}
}