package ui

import (
	"fmt"

	"github.com/gdamore/tcell/v2"
)

type coord struct {
	x, y int
}

type MockScreen struct {
	x, y, h, w int
	content    map[coord]rune
}

func (m *MockScreen) Init() error {
	m.content = map[coord]rune{}
	return nil
}

func (m *MockScreen) Fini() {}

func (m *MockScreen) Clear() {
	m.content = map[coord]rune{}
}

func (m *MockScreen) Fill(rune, tcell.Style) {}

func (m *MockScreen) SetCell(x int, y int, style tcell.Style, ch ...rune) {}

func (m *MockScreen) GetContent(x, y int) (mainc rune, combc []rune, style tcell.Style, width int) {
	return m.content[coord{x, y}], nil, tcell.StyleDefault, 1
}

func (m *MockScreen) SetContent(x int, y int, mainc rune, combc []rune, style tcell.Style) {
	m.content[coord{x, y}] = mainc
}

func (m *MockScreen) Suspend() error {
	return nil
}

func (m *MockScreen) Resume() error {
	return nil
}

func (m *MockScreen) SetStyle(style tcell.Style) {}

func (m *MockScreen) SetCursorStyle(style tcell.CursorStyle) {}

func (m *MockScreen) ShowCursor(x int, y int) {}

func (m *MockScreen) HideCursor() {}

func (m *MockScreen) Size() (int, int) {
	return m.h, m.w
}

func (m *MockScreen) PollEvent() tcell.Event {
	return tcell.NewEventError(fmt.Errorf("mock error"))
}

func (m *MockScreen) ChannelEvents(ch chan<- tcell.Event, quit <-chan struct{}) {}

func (m *MockScreen) HasPendingEvent() bool {
	return false
}

func (m *MockScreen) PostEvent(ev tcell.Event) error {
	return nil
}

func (m *MockScreen) PostEventWait(ev tcell.Event) {}

func (m *MockScreen) EnableMouse(...tcell.MouseFlags) {}

func (m *MockScreen) DisableMouse() {}

func (m *MockScreen) EnablePaste() {}

func (m *MockScreen) DisablePaste() {}

func (m *MockScreen) HasMouse() bool {
	return false
}

func (m *MockScreen) Colors() int {
	return 0
}

func (m *MockScreen) Show() {}

func (m *MockScreen) Sync() {}

func (m *MockScreen) CharacterSet() string {
	return "UTF-8"
}

func (m *MockScreen) RegisterRuneFallback(r rune, subst string) {}

func (m *MockScreen) UnregisterRuneFallback(r rune) {}

func (m *MockScreen) CanDisplay(r rune, checkFallbacks bool) bool {
	return true
}

func (m *MockScreen) Resize(x, y, h, w int) {
	m.x, m.y, m.h, m.w = x, y, h, w
}

func (m *MockScreen) SetSize(h, w int) {
	m.h, m.w = h, w
}

func (m *MockScreen) HasKey(tcell.Key) bool {
	return true
}

func (m *MockScreen) Beep() error {
	return nil
}

func (m *MockScreen) DumpContents() string {
	var res string
	for i := m.y; i < m.h; i++ {
		str := []rune{}
		for j := m.x; j < m.w; j++ {
			r, ok := m.content[coord{x: j, y: i}]
			if ok {
				str = append(str, r)
			} else {
				str = append(str, ' ')
			}
		}
		res = res + string(str) + "\n"
	}
	return res
}