pokedex_cli/repl.go

package main

import (
	"fmt"
	"strings"
	"bufio"
	"os"
	"k3gtpi.jumpingcrab.com/go-learning/pokedexcli/internal/pokecache"
	"time"
)

type cliCommand struct {
	name		string
	description	string
	callback	func(*PokedexConfig, *pokecache.Cache) error
}

type PokedexConfig struct {
	Next		*string
	Previous	*string
	Results		[]map[string]string
}

var supportedCommands map[string]cliCommand

func startRepl() {
	reader := bufio.NewScanner(os.Stdin)
	fmt.Println("Welcome to the Pokedex!")
	pokedexConfig := PokedexConfig{}
	cache := pokecache.NewCache(5 * time.Second)
	for {
		// Print prompt
		fmt.Printf("Pokedex > ")
		reader.Scan()

		words := cleanInput(reader.Text())
		if len(words) == 0 {
			continue
		}

		commandName := words[0]	

		command, valid := getCommands()[commandName]
		if !valid {
			fmt.Println("Unknown command.")
			continue
		}
		if err := command.callback(&pokedexConfig, cache); err != nil {
			fmt.Printf("Encountered error running command: %v\nErr: %v", command.name, err)
		}
	}
}

func cleanInput(text string) []string {
	if len(text) == 0 {
		fmt.Println("Input is empty!")
		return []string{}
	}
	output := strings.ToLower(text)
	words := strings.Fields(output)
	return words
}

func getCommands() map[string]cliCommand{
	return map[string]cliCommand{
		"help": {
			name:			"help",
			description:	"Prints this help menu.",
			callback:		commandHelp,
		},
		"exit": {
			name:			"exit",
			description:	"Exits the Pokedex",
			callback:		commandExit,
		},
		"map": {
			name:			"map",
			description:	"Print Pokemon world locations.",
			callback:		commandMap,
		},
		"mapb": {
			name:			"mapb",
			description:	"Print previoud Pokemon locationsi.",
			callback:		commandMapb,
		},
	}
}