package action

import (
	"strings"

	"git.gophernest.net/azpect/TextEditor/internal/core"
	tea "github.com/charmbracelet/bubbletea"
)

type EnterSearchMode struct {
	Forward bool
}

func (a EnterSearchMode) Execute(m Model) tea.Cmd {
	search := m.SearchState()
	search.Forword = a.Forward

	// BUG: Not sure if this is safe?
	m.SetCommandOutput(nil)

	m.SetSearchState(search)
	m.SetMode(core.SearchMode)
	return nil
}

type ExitSearchMode struct{}

func (a ExitSearchMode) Execute(m Model) tea.Cmd {
	// Reset state
	search := m.SearchState()

	if strings.TrimSpace(search.Query) != "" {
		search.History = append(search.History, search.Query)
	}
	search.Cursor = 0
	search.Query = ""
	search.HistoryCursor = 0

	// TODO: Maybe we want to keep Query until we enter it again next, for N and n?

	m.SetSearchState(search)
	m.SetMode(core.NormalMode)
	return nil
}

type InsertSearchChar struct {
	Char string
}

// InsertSearchChar.Execute: Inserts a character at the search cursor position.
func (a InsertSearchChar) Execute(m Model) tea.Cmd {
	search := m.SearchState()

	cur := search.Cursor
	query := search.Query

	search.Query = query[:cur] + a.Char + query[cur:]
	search.Cursor++

	m.SetSearchState(search)
	return nil
}

// SearchBackspace implements Action - deletes character before cursor in search mode.
type SearchBackspace struct{}

// SearchBackspace.Execute: Deletes the character before the search cursor (Backspace key).
func (a SearchBackspace) Execute(m Model) tea.Cmd {
	search := m.SearchState()

	cur := search.Cursor
	query := search.Query

	if cur > 0 {
		search.Query = query[:cur-1] + query[cur:]
		search.Cursor--
		m.SetSearchState(search)
	}

	return nil
}

// SearchDelete implements Action - deletes character at cursor in search mode.
type SearchDelete struct{}

// SearchDelete.Execute: Deletes the character at the command cursor (Delete key).
func (a SearchDelete) Execute(m Model) tea.Cmd {
	search := m.SearchState()
	cur := search.Cursor
	query := search.Query

	if cur < len(query)-1 {
		search.Query = query[:cur+1] + query[cur+2:]
	} else if cur == len(query)-1 {
		// last text char, delete it
		search.Query = query[:cur] + query[cur+1:]
	} else if cur == len(query) && cur > 0 {
		// if at end, we do backspace op
		search.Query = query[:cur-1] + query[cur:]
		search.Cursor = max(0, search.Cursor-1)
	}

	m.SetSearchState(search)
	return nil
}

// SearchDeletePreviousWord implements Action - deletes word before cursor in search mode.
type SearchDeletePreviousWord struct{}

// SearchDeletePreviousWord.Execute: Deletes the word before the search cursor (Ctrl+W).
func (a SearchDeletePreviousWord) Execute(m Model) tea.Cmd {
	search := m.SearchState()
	cur := search.Cursor
	cmd := search.Query

	if cur > 0 {
		newCur := cur

		// If we are on punctuation, we should just skip them all and quit
		if isPunctuation(cmd[newCur-1]) {
			for newCur > 0 && isPunctuation(cmd[newCur-1]) {
				newCur--
			}

			search.Query = cmd[:newCur] + cmd[cur:]
			search.Cursor = newCur
			m.SetSearchState(search)

			return nil
		}

		// Skip whitespace immediately before the cursor
		for newCur > 0 && (cmd[newCur-1] == ' ' || cmd[newCur-1] == '\t') {
			newCur--
		}

		// Skip the word characters before the cursor
		for newCur > 0 && isWordChar(cmd[newCur-1]) {
			newCur--
		}

		// Delete everything from newCur up to cur in one operation
		search.Query = cmd[:newCur] + cmd[cur:]
		search.Cursor = newCur
		m.SetSearchState(search)
	}

	return nil
}

type SearchExecute struct{}

func (a SearchExecute) Execute(m Model) tea.Cmd {
	search := m.SearchState()

	// Exit normally
	defer func() {
		act := ExitSearchMode{}
		act.Execute(m)
	}()

	if !search.Forword {
		m.SetCommandOutput(&core.CommandOutput{
			Lines:   []string{"reverse search not implemented yet."},
			Inline:  true,
			IsError: true,
		})
		return nil
	}

	// Do the search
	win := m.ActiveWindow()
	buf := m.ActiveBuffer()

	x, y := win.Cursor.Col, win.Cursor.Line

	return nil
}