package main

import (
	"bufio"
	"errors"
	"flag"
	"fmt"
	"log"
	"os"

	"git.zom.bi/fanir/feedizer/cmd/feedizer/internal/config"
	"git.zom.bi/fanir/feedizer/cmd/feedizer/internal/database"
	"git.zom.bi/fanir/feedizer/cmd/feedizer/internal/database/migrator"
	"git.zom.bi/fanir/feedizer/cmd/feedizer/internal/server"
	"github.com/golang-migrate/migrate/v4"
)

func Usage() {
	fmt.Fprintf(flag.CommandLine.Output(), "Usage of %s:\n", os.Args[0])

	fmt.Println(`
Flags:`)
	flag.PrintDefaults()

	fmt.Println(`
Commands:
  run (default action)
        Run the server.
  newconfig
        Write a new config file.
  purgedb
        Purge the database by undoing all migrations.
  help
        Show this help.

Default Config Search Paths:`)
	for _, path := range config.SearchPaths() {
		fmt.Println(" ", path)
	}
	fmt.Println(`
  All paths are read in order, skipping non existant files. Settings in later files overwrite previous ones.`)
}

func main() {
	configFile := flag.String("C", "", "custom config file path")
	autoMigrate := flag.Bool("m", true, "Automatically migrate the database to the highest version.")
	flag.Parse()

	flag.Usage = Usage

	switch flag.Arg(0) {
	case "", "run":
		startApp(*autoMigrate)

	case "help":
		flag.Usage()

	case "newconfig":
		path, err := config.WriteFile(*configFile)
		if err != nil {
			fmt.Printf("cannot write config file %s: %s", path, err)
			os.Exit(1)
		}
		fmt.Println("wrote config file", path)

	case "purgedb":
		purgeDB()

	default:
		fmt.Printf("invalid action %s\n\n", flag.Arg(0))
		fmt.Println("valid actions are probably: run (default), newconfig, purgedb")
	}
}

func startApp(automigrate bool) {
	cfg, err := config.Load()
	if err != nil {
		log.Fatalln(err)
	}

	if !cfg.AllowRoot && os.Geteuid() == 0 {
		log.Fatalln("do not run feedizer as root")
	}

	if automigrate {
		log.Println("migrating database...")
		if err = migrator.New(cfg.Database).Migrate(); err != nil && !errors.Is(err, migrate.ErrNoChange) {
			log.Fatalln(err)
		}
		log.Println("migration successful")
	}

	log.Println("starting server...")
	server.Start(cfg)
}

func purgeDB() {
	cfg, err := config.Load()
	if err != nil {
		log.Fatalln(err)
	}

	_, err = database.ParseConfig(cfg.Database)
	if err != nil {
		log.Fatalln(err)
	}

	fmt.Printf("PURGE database %s? You will loose all data. [yes/no]\n", database.LogName)
	in, err := bufio.NewReader(os.Stdin).ReadString('\n')
	if err != nil {
		log.Fatalln(err)
	}
	if in != "yes\n" {
		fmt.Println("Aborting. (You must type \"yes\" to continue)")
		return
	}

	fmt.Println("purging database...")
	if err = migrator.New(cfg.Database).Purge(); err != nil && !errors.Is(err, migrate.ErrNoChange) {
		log.Fatalln(err)
	}
	fmt.Println("purging successful")
}