package action

import (
	tea "github.com/charmbracelet/bubbletea"
)

// Mode constants for editor mode
type Mode int

const (
	NormalMode Mode = iota
	InsertMode
	CommandMode
	VisualMode
	VisualLineMode
	VisualBlockMode
)

func (m Mode) ToString() string {
	switch m {
	case NormalMode:
		return "NORMAL"
	case InsertMode:
		return "INSERT"
	case CommandMode:
		return "COMMAND"
	case VisualMode:
		return "VISUAL"
	case VisualLineMode:
		return "V-LINE"
	case VisualBlockMode:
		return "V-BLOCK"
	default:
		return "-----"
	}
}

func (m Mode) IsVisualMode() bool {
	return m == VisualMode ||
		m == VisualLineMode ||
		m == VisualBlockMode
}

// Model defines the interface for editor state that actions can modify
type Model interface {
	// Text buffer
	Lines() []string
	Line(idx int) string
	SetLine(idx int, content string)
	InsertLine(idx int, content string)
	DeleteLine(idx int)
	LineCount() int

	// Cursor
	CursorX() int
	CursorY() int
	SetCursorX(x int)
	SetCursorY(y int)
	ClampCursorX()

	// Window
	ScrollY() int
	SetScrollY(y int)

	// Anchor
	AnchorX() int
	AnchorY() int
	SetAnchorX(x int)
	SetAnchorY(y int)

	// Insert
	InsertKeys() []string
	SetInsertKeys(keys []string)

	// Command mode
	Command() string
	SetCommand(cmd string)
	CommandCursor() int
	SetCommandCursor(cur int)

	// Settings
	Settings() Settings

	// Mode
	Mode() Mode
	SetMode(mode Mode)

	// Insert recording (for count replay)
	SetInsertRecording(count int, action Action)

	// ExitInsertMode handles replay, cursor step-back, and mode transition on esc
	ExitInsertMode()
}

// Position represents a location in the buffer
type Position struct {
	Line, Col int
}

// MotionType indicates how a motion operates
type MotionType int

const (
	Charwise MotionType = iota // h, l, w, e, f, t - operates on characters
	Linewise                   // j, k, G, gg, {, } - operates on whole lines
)

// Action is the base interface - anything executable
type Action interface {
	Execute(m Model) tea.Cmd
}

// Motion moves the cursor and returns the range covered
type Motion interface {
	Action
	Type() MotionType
}

// Operator acts on a range (delete, yank, change)
type Operator interface {
	Operate(m Model, start, end Position, mtype MotionType) tea.Cmd
	// DoublePress handles dd, yy, cc (line-wise)
	DoublePress(m Model, count int) tea.Cmd
}

// Repeatable actions track count
type Repeatable interface {
	WithCount(n int) Action
}