package main

import (
	"database/sql"
	"encoding/json"
	"log"
	"net/http"
	"os"

	_ "github.com/mattn/go-sqlite3"

	. "meutel.net/meutel/go-bouquins/bouquins"
)

type BouquinsConf struct {
	BindAddress string `json:"bind-address"`
	DbPath      string `json:"db-path"`
	CalibrePath string `json:"calibre-path"`
}

var db *sql.DB

// load config
func ReadConfig() (*BouquinsConf, error) {
	conf := new(BouquinsConf)
	confPath := "bouquins.json"
	if len(os.Args) > 1 {
		confPath = os.Args[1]
	}
	confFile, err := os.Open(confPath)
	if err == nil {
		defer confFile.Close()
		err = json.NewDecoder(confFile).Decode(conf)
	} else {
		log.Println("no conf file, using defaults")
		err = nil
	}
	// default values
	if conf.CalibrePath == "" {
		conf.CalibrePath = "."
	}
	if conf.DbPath == "" {
		conf.DbPath = conf.CalibrePath + "/metadata.db"
	}
	if conf.BindAddress == "" {
		conf.BindAddress = ":9000"
	}
	return conf, err
}

func initApp() *BouquinsConf {
	log.SetFlags(log.LstdFlags | log.Lshortfile)
	conf, err := ReadConfig()
	if err != nil {
		log.Fatalln(err)
	}

	tpl, err := TemplatesFunc().ParseGlob("templates/*.html")
	if err != nil {
		log.Fatalln(err)
	}
	db, err = sql.Open("sqlite3", conf.DbPath)
	if err != nil {
		log.Fatalln(err)
	}
	app := &Bouquins{tpl, db}
	err = app.PrepareAll()
	if err != nil {
		log.Fatalln(err)
	}
	assets(conf.CalibrePath)
	router(app)
	return conf
}

func assets(calibre string) {
	http.Handle(URL_JS, http.FileServer(http.Dir("assets")))
	http.Handle(URL_CSS, http.FileServer(http.Dir("assets")))
	http.Handle(URL_FONTS, http.FileServer(http.Dir("assets")))
	http.Handle(URL_CALIBRE, http.StripPrefix(URL_CALIBRE, http.FileServer(http.Dir(calibre))))
}

func handle(f func(res http.ResponseWriter, req *http.Request) error) func(res http.ResponseWriter, req *http.Request) {
	return func(res http.ResponseWriter, req *http.Request) {
		err := f(res, req)
		if err != nil {
			log.Println(err)
			http.Error(res, err.Error(), 500)
		}
	}
}

func handleUrl(url string, f func(res http.ResponseWriter, req *http.Request) error) {
	http.HandleFunc(url, handle(f))
}

func router(app *Bouquins) {
	handleUrl(URL_INDEX, app.IndexPage)
	handleUrl(URL_BOOKS, app.BooksPage)
	handleUrl(URL_AUTHORS, app.AuthorsPage)
	handleUrl(URL_SERIES, app.SeriesPage)
	handleUrl(URL_SEARCH, app.SearchPage)
	handleUrl(URL_ABOUT, app.AboutPage)
}

func main() {
	conf := initApp()
	defer db.Close()
	http.ListenAndServe(conf.BindAddress, nil)
}