package api

import (
	"fmt"
	"io"
	"log"
	"time"

	"gitea.unprism.ru/yotia/display-test/api/pages"
	"gitea.unprism.ru/yotia/display-test/display"
	"gitea.unprism.ru/yotia/display-test/drawer"
)

const (
	loopTimeout = 10 * time.Millisecond
)

type displayApi struct {
	d drawer.Drawer

	curPage pages.Page

	initPage   pages.InitPage
	statusPage pages.StatusPage
}

// Work process:
// Display has pages that you can switch between. Switch returns page controller.
// Every page has values that you can change:
//   Init page - title, progress bar
//   Status page - gps, time, rssi, service, ...

type Display interface {
	// Put them to different functions because of different returns
	SwitchToInitPage() pages.InitPageContent
	SwitchToStatusPage() pages.StatusPageContent
	io.Closer
}

func New() (Display, error) {
	// Device
	dev, err := display.New(log.New(log.Writer(), "display", log.LstdFlags), display.MT12232A)
	if err != nil {
		return nil, fmt.Errorf("create display: %w", err)
	}
	// Drawer
	d := drawer.New(dev)

	// Pages

	// Init page
	initPage, err := pages.NewInitPage(d)
	if err != nil {
		return nil, fmt.Errorf("new init page: %w", err)
	}
	// Status page
	statusPage, err := pages.NewStatusPage(d)
	if err != nil {
		return nil, fmt.Errorf("new init page: %w", err)
	}

	return &displayApi{
		d:          d,
		initPage:   initPage,
		statusPage: statusPage,
	}, nil
}

func (d *displayApi) switchToPage(p pages.Page) {
	if d.curPage != nil {
		d.curPage.Diactivate()
	}
	if p != nil {
		p.Activate()
	}
	d.curPage = p
}

func (d *displayApi) SwitchToInitPage() pages.InitPageContent {
	d.switchToPage(d.initPage)
	return d.initPage
}

func (d *displayApi) SwitchToStatusPage() pages.StatusPageContent {
	d.switchToPage(d.statusPage)
	return d.statusPage
}

func (d *displayApi) Close() error {
	// !!! TMP DEBUG BAD CODE
	d.d.Clear()
	time.Sleep(100 * time.Millisecond)
	// !!!

	d.switchToPage(nil) // To deactivate cur page
	return d.d.GetDisplay().Close()
}