package motion

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

// MoveCommandLeft implements Motion - moves cursor left in command line.
type MoveCommandLeft struct{}

// MoveCommandLeft.Execute: Moves the command line cursor one position to the left.
func (a MoveCommandLeft) Execute(m action.Model) tea.Cmd {
	// The set function handles bounds
	m.SetCommandCursor(m.CommandCursor() - 1)
	return nil
}

// MoveCommandLeft.Type: Returns CharwiseExclusive for command line motion.
func (a MoveCommandLeft) Type() core.MotionType { return core.CharwiseExclusive }

// MoveCommandRight implements Motion - moves cursor right in command line.
type MoveCommandRight struct{}

// MoveCommandRight.Execute: Moves the command line cursor one position to the right.
func (a MoveCommandRight) Execute(m action.Model) tea.Cmd {
	// The set function handles bounds
	m.SetCommandCursor(m.CommandCursor() + 1)
	return nil
}

// MoveCommandRight.Type: Returns CharwiseExclusive for command line motion.
func (a MoveCommandRight) Type() core.MotionType { return core.CharwiseExclusive }

// ==================================================
// Command History Motions
// ==================================================

// MoveCommandHistoryUp implements Motion - moves cursor right in command line.
type MoveCommandHistoryUp struct{}

// MoveCommandHistoryUp.Execute: Moves the command history cursor up (if possible).
func (a MoveCommandHistoryUp) Execute(m action.Model) tea.Cmd {
	cur := m.CommandHistoryCursor() // always +1 (bascially indexed at 1)
	history := m.CommandHistory()

	if cur < len(history) {
		cmd := history[cur]
		m.SetCommand(cmd)
		m.SetCommandCursor(len(cmd))

		// Only go up if we can
		m.SetCommandHistoryCursor(cur + 1)
	}

	return nil
}

// MoveCommandHistoryUp.Type: Returns Linewise for command line motion.
func (a MoveCommandHistoryUp) Type() core.MotionType { return core.Linewise }

// MoveCommandHistoryDown implements Motion - moves cursor right in command line.
type MoveCommandHistoryDown struct{}

// MoveCommandHistoryDown.Execute: Moves the command history cursor down (if possible).
func (a MoveCommandHistoryDown) Execute(m action.Model) tea.Cmd {
	cur := m.CommandHistoryCursor() // always +1 (bascially indexed at 1)
	history := m.CommandHistory()

	if cur > 1 {
		cmd := history[cur-2]
		m.SetCommand(cmd)
		m.SetCommandCursor(len(cmd))
	} else {
		m.SetCommand("") // BUG: We should probably keep the original in state
		m.SetCommandCursor(0)
	}

	m.SetCommandHistoryCursor(max(0, cur-1))
	return nil
}

// MoveCommandHistoryDown.Type: Returns Linewise for command line motion.
func (a MoveCommandHistoryDown) Type() core.MotionType { return core.Linewise }