package main

import (
	"html/template"
	"sync"
	"time"

	"riedstra.dev/mitch/steam-export/steam"
)

// steamLib is a steam libary with an embeded mutex to protect it
type steamLib struct {
	steam.Library
	sync.Mutex
}

// statusInfo represents the internal status of game installation
type statusInfo struct {
	sync.RWMutex
	Running     bool
	Error       error
	Url         string
	Transferred int64
	Size        int64
	Start       *time.Time
}

// App binds together the steam library, templates, and channel for install
// requests as well as most the app specific http handlers.
type App struct {
	Library *steamLib
	Status  *statusInfo

	Templates *template.Template

	// Sending to this channel triggers the downloader in the background
	download chan string
}

// NewApp sets up the steam library for us as well as parses the embedded
// template
func NewApp(libPath string) (*App, error) {
	lib, err := steam.NewLibrary(libPath)
	if err != nil {
		return nil, err
	}

	a := &App{
		Library:  &steamLib{},
		Status:   &statusInfo{},
		download: make(chan string),
	}

	a.Library.Library = *lib

	a.Templates = template.Must(template.New("index").Parse(indexTemplate))

	return a, nil
}

// LibrarySet takes care of locking the Library and switching over to a new
// path, unlocking when done.
// Errors will be logged and no changes will be made if unsuccessful.
func (a *App) LibrarySet(path string) {
	Logger.Println("Starting library reload")
	a.Library.Lock()
	defer a.Library.Unlock()
	var err error
	l2, err := steam.NewLibrary(path)
	if err != nil {
		Logger.Printf("Error reopening lib: %s", err)
		return
	}
	a.Library.Library = *l2
	Logger.Println("Done reloading lib")
}

// LibraryReload calls LibrarySet but with the current directory, forcing a reload of
// information off of disk.
func (a *App) LibraryReload() {
	cur := a.Library.Folder
	a.LibrarySet(cur)
	return
}