package main

import (
	"fmt"
	"io"
	"os"
)

type Command interface {
	Name() string
	Init(args []string) error
	Run(stdin io.Reader, stdout io.Writer) error
}

func main() {
	if len(os.Args) < 2 {
		printHelp()
		os.Exit(1)
	}

	cmdName := os.Args[1]
	args := os.Args[2:]

	if cmdName == "help" || cmdName == "--help" || cmdName == "-h" {
		printHelp()
		os.Exit(0)
	}

	var cmd Command
	switch cmdName {
	case "scrape":
		cmd = &ScrapeCommand{}
	case "serve":
		cmd = &ServeCommand{}
	default:
		fmt.Fprintf(os.Stderr, "Unknown command: %s\n\n", cmdName)
		printHelp()
		os.Exit(1)
	}

	if err := cmd.Init(args); err != nil {
		fmt.Fprintf(os.Stderr, "Error initializing %s: %v\n", cmdName, err)
		os.Exit(1)
	}

	if err := cmd.Run(os.Stdin, os.Stdout); err != nil {
		fmt.Fprintf(os.Stderr, "Error running %s: %v\n", cmdName, err)
		os.Exit(1)
	}
}

func printHelp() {
	fmt.Printf(`abvjt <command> [arguments]

Journal abbreviation lookup service.

Commands:
    scrape          Scrape WOS journal abbreviations into SQLite DB
    serve           Start HTTP server for web UI and API
    help            Show this help message

Usage:
    abvjt scrape --db data/abvjt.db
    abvjt serve --port 8080 --db data/abvjt.db

`)
}