/*
datamaps-go is a simple tool to extract from and send data to spreadsheets.
*/
package main

import (
	"flag"
	"fmt"
	"log"
	"net/http"
	"os"
	"path/filepath"

	"github.com/yulqen/datamaps-go/pkg/reader"
)

const (
	config_dir_name = "datamaps-go"
	db_name         = "datamaps.db"
)

func setUp() (string, error) {
	dir, err := os.UserConfigDir()
	if err != nil {
		return "", err
	}
	// check if config folder exists
	config_path := filepath.Join(dir, config_dir_name)
	db_path := filepath.Join(config_path, db_name)
	if _, err := os.Stat(config_path); os.IsNotExist(err) {
		log.Println("Config directory does not exist.")
		log.Printf("Creating config directory %s\n", config_path)
		if err := os.Mkdir(filepath.Join(dir, "datamaps-go"), 0700); err != nil {
			return "", err
		}
	} else {
		log.Println("Config directory found.")
	}
	if _, err := os.Stat(db_path); os.IsNotExist(err) {
		log.Println("Database does not exist.")
		_, err = os.Create(db_path)
		if err != nil {
			return "", err
		}
		log.Printf("Creating database file at %s\n", db_path)
		_, err := reader.SetupDB(db_path)
		if err != nil {
			return "", err
		}
	} else {
		log.Println("Database file found.")
	}
	return dir, nil
}

func main() {
	// setup command
	setupCmd := flag.NewFlagSet("setup", flag.ExitOnError)
	setupCmd.Usage = func() { fmt.Println("No, you fucking idiot!") }

	// datamap command and its flags
	datamapCmd := flag.NewFlagSet("datamap", flag.ExitOnError)
	importFlg := datamapCmd.String("import", "/home/lemon/Documents/datamaps/input/datamap.csv", "Path to datamap")
	nameFlg := datamapCmd.String("name", "Unnamed datamap", "The name you want to give to the imported datamap.")
	overwriteFlg := datamapCmd.Bool("overwrite", false, "Start fresh with this datamap (erases existing datamap data).")
	initialFlg := datamapCmd.Bool("initial", false, "This option must be used where no datamap table yet exists.")

	// server command and its flags
	serverCmd := flag.NewFlagSet("server", flag.ExitOnError)

	if len(os.Args) < 2 {
		fmt.Println("Expected 'datamap' or 'setup' subcommand")
		os.Exit(1)
	}

	switch os.Args[1] {

	case "server":
		serverCmd.Parse(os.Args[2:])
		http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
			if r.URL.Path != "/" {
				http.NotFound(w, r)
				return
			}
			fmt.Fprintf(w, "Welcome to datamaps!")
			// or you could write it thus
			// w.Write([]byte("Hello from Snippetbox"))
		})
		log.Println("Starting server on :8080")
		err := http.ListenAndServe(":8080", nil)
		log.Fatal(err)

	case "datamap":
		datamapCmd.Parse(os.Args[2:])
		fmt.Println("subcommand 'datamap'")
		fmt.Println("  import:", *importFlg)
		fmt.Println("  name:", *nameFlg)
		fmt.Println("  overwrite:", *overwriteFlg)
		fmt.Println("  initial:", *initialFlg)

		dir, err := os.UserConfigDir()
		if err != nil {
			os.Exit(1)
		}
		// check if config folder exists
		config_path := filepath.Join(dir, config_dir_name)
		if _, err := os.Stat(config_path); os.IsNotExist(err) {
			fmt.Println("Config directory and database does not exist. Run datamaps setup to fix.")
			os.Exit(1)
		}
		// Here we actually read the data from the file
		data, err := reader.ReadDML(*importFlg)
		if err != nil {
			log.Fatal(err)
		}

		db_path := filepath.Join(config_path, db_name)
		err = reader.DatamapToDB(db_path, data, *nameFlg, *importFlg)
		if err != nil {
			log.Fatal(err)
		}
	case "setup":
		setupCmd.Parse(os.Args[2:])
		_, err := setUp()
		if err != nil {
			log.Fatal(err)
		}

	default:
		fmt.Println("Do not recognised that command. Expected 'datamap' subcommand.")
		os.Exit(1)
	}
}