package main

import (
	"context"
	"fmt"
	"log"
	"os"

	"github.com/fatih/color"
	"github.com/urfave/cli/v3"
)

var NoCache, DoClearCache bool
var ListAscend, ListDescend, ListNoDep bool

func main() {
	EnsureBrewAvailable()

	cmd := &cli.Command{
		Name:  "wthis",
		Usage: "Fetch information of a Homebrew formulae or cask, like how it got installed, reverse dependencies, etc.",
		Flags: []cli.Flag{
			&cli.BoolFlag{
				Name:        "no-cache",
				Aliases:     []string{"nc"},
				Usage:       "Disable caching",
				Value:       false,
				Destination: &NoCache,
			},
		},
		Action: func(ctx context.Context, cmd *cli.Command) error {
			if DoClearCache {
				ClearCache()
				fmt.Println("Cache cleared.")
				os.Exit(0)
			}
			if cmd.Args().Len() == 0 {
				printErrorAndExit("Please provide a formulae/cask name.")
			}

			pkgName := cmd.Args().First()
			stat := fetchAndDisplay(pkgName)

			if !NoCache {
				stat.Cache()
			}
			return nil
		},
		Commands: []*cli.Command{
			{
				Name:    "list",
				Aliases: []string{"l", "ls"},
				Usage:   "Better brew list.",
				Flags: []cli.Flag{
					&cli.BoolFlag{
						Name:        "ascending",
						Aliases:     []string{"a"},
						Usage:       "Sort list ascendingly, based on dependency count.",
						Value:       false,
						Destination: &ListAscend,
					},
					&cli.BoolFlag{
						Name:        "descending",
						Aliases:     []string{"d"},
						Usage:       "Sort list descendingly, based on dependency count.",
						Value:       false,
						Destination: &ListDescend,
					},
					&cli.BoolFlag{
						Name:        "no-dependency",
						Aliases:     []string{"n", "nd"},
						Usage:       "Only show packages installed on request, with no dependency list.",
						Value:       false,
						Destination: &ListNoDep,
					},
				},
				Action: func(ctx context.Context, cmd *cli.Command) error {
					return runList()
				},
			},
			{
				Name:    "clean",
				Aliases: []string{"c", "cache"},
				Usage:   "Delete all cache files.",
				Action: func(ctx context.Context, cmd *cli.Command) error {
					ClearCache()
					fmt.Println("Cache cleared.")
					return nil
				},
			},
		},
	}

	if err := cmd.Run(context.Background(), os.Args); err != nil {
		log.Fatal(err)
	}
}

func fetchData(pkgName string,
	fmlChan chan *FormulaInfo,
	caskChan chan *CaskInfo,
	rvsChan chan []string) {
	go func() {
		formula, cask := GetBrewInfo(pkgName)
		fmlChan <- formula
		caskChan <- cask
	}()
	go func() {
		fmlChan <- GetFormulaFromAPI(pkgName)
	}()
	go func() {
		caskChan <- GetCaskFromAPI(pkgName)
	}()

	go func() {
		rvsChan <- GetBrewUses(pkgName)
	}()
}

func printErrorAndExit(msg string) {
	hideLoadingPrompt()
	color.Red("❌ %s", msg)
	os.Exit(1)
}