package main

import (
	"context"
	"fmt"
	"os"
	"path/filepath"

	"github.com/leonelquinteros/gotext"

	"github.com/Jguer/yay/v11/pkg/db"
	"github.com/Jguer/yay/v11/pkg/dep"
	"github.com/Jguer/yay/v11/pkg/query"
	"github.com/Jguer/yay/v11/pkg/settings"
	"github.com/Jguer/yay/v11/pkg/settings/parser"
	"github.com/Jguer/yay/v11/pkg/stringset"
	"github.com/Jguer/yay/v11/pkg/text"
)

// CleanDependencies removes all dangling dependencies in system.
func cleanDependencies(ctx context.Context, cmdArgs *parser.Arguments, dbExecutor db.Executor, removeOptional bool) error {
	hanging := hangingPackages(removeOptional, dbExecutor)
	if len(hanging) != 0 {
		return cleanRemove(ctx, cmdArgs, hanging)
	}

	return nil
}

// CleanRemove sends a full removal command to pacman with the pkgName slice.
func cleanRemove(ctx context.Context, cmdArgs *parser.Arguments, pkgNames []string) error {
	if len(pkgNames) == 0 {
		return nil
	}

	arguments := cmdArgs.CopyGlobal()
	_ = arguments.AddArg("R")
	arguments.AddTarget(pkgNames...)

	return config.Runtime.CmdBuilder.Show(
		config.Runtime.CmdBuilder.BuildPacmanCmd(ctx,
			arguments, config.Runtime.Mode, settings.NoConfirm))
}

func syncClean(ctx context.Context, cmdArgs *parser.Arguments, dbExecutor db.Executor) error {
	keepInstalled := false
	keepCurrent := false

	_, removeAll, _ := cmdArgs.GetArg("c", "clean")

	for _, v := range config.Runtime.PacmanConf.CleanMethod {
		if v == "KeepInstalled" {
			keepInstalled = true
		} else if v == "KeepCurrent" {
			keepCurrent = true
		}
	}

	if config.Runtime.Mode.AtLeastRepo() {
		if err := config.Runtime.CmdBuilder.Show(config.Runtime.CmdBuilder.BuildPacmanCmd(ctx,
			cmdArgs, config.Runtime.Mode, settings.NoConfirm)); err != nil {
			return err
		}
	}

	if !config.Runtime.Mode.AtLeastAUR() {
		return nil
	}

	var question string
	if removeAll {
		question = gotext.Get("Do you want to remove ALL AUR packages from cache?")
	} else {
		question = gotext.Get("Do you want to remove all other AUR packages from cache?")
	}

	fmt.Println(gotext.Get("\nBuild directory:"), config.BuildDir)

	if text.ContinueTask(question, true, settings.NoConfirm) {
		if err := cleanAUR(ctx, keepInstalled, keepCurrent, removeAll, dbExecutor); err != nil {
			return err
		}
	}

	if removeAll {
		return nil
	}

	if text.ContinueTask(gotext.Get("Do you want to remove ALL untracked AUR files?"), true, settings.NoConfirm) {
		return cleanUntracked(ctx)
	}

	return nil
}

func cleanAUR(ctx context.Context, keepInstalled, keepCurrent, removeAll bool, dbExecutor db.Executor) error {
	fmt.Println(gotext.Get("removing AUR packages from cache..."))

	installedBases := make(stringset.StringSet)
	inAURBases := make(stringset.StringSet)

	remotePackages, _ := query.GetRemotePackages(dbExecutor)

	files, err := os.ReadDir(config.BuildDir)
	if err != nil {
		return err
	}

	cachedPackages := make([]string, 0, len(files))

	for _, file := range files {
		if !file.IsDir() {
			continue
		}

		cachedPackages = append(cachedPackages, file.Name())
	}

	// Most people probably don't use keep current and that is the only
	// case where this is needed.
	// Querying the AUR is slow and needs internet so don't do it if we
	// don't need to.
	if keepCurrent {
		info, errInfo := query.AURInfo(ctx, config.Runtime.AURClient, cachedPackages, &query.AURWarnings{}, config.RequestSplitN)
		if errInfo != nil {
			return errInfo
		}

		for _, pkg := range info {
			inAURBases.Set(pkg.PackageBase)
		}
	}

	for _, pkg := range remotePackages {
		if pkg.Base() != "" {
			installedBases.Set(pkg.Base())
		} else {
			installedBases.Set(pkg.Name())
		}
	}

	for _, file := range files {
		if !file.IsDir() {
			continue
		}

		if !removeAll {
			if keepInstalled && installedBases.Get(file.Name()) {
				continue
			}

			if keepCurrent && inAURBases.Get(file.Name()) {
				continue
			}
		}

		err = os.RemoveAll(filepath.Join(config.BuildDir, file.Name()))
		if err != nil {
			return nil
		}
	}

	return nil
}

func cleanUntracked(ctx context.Context) error {
	fmt.Println(gotext.Get("removing untracked AUR files from cache..."))

	files, err := os.ReadDir(config.BuildDir)
	if err != nil {
		return err
	}

	for _, file := range files {
		if !file.IsDir() {
			continue
		}

		dir := filepath.Join(config.BuildDir, file.Name())
		if isGitRepository(dir) {
			if err := config.Runtime.CmdBuilder.Show(config.Runtime.CmdBuilder.BuildGitCmd(ctx, dir, "clean", "-fx")); err != nil {
				text.Warnln(gotext.Get("Unable to clean:"), dir)

				return err
			}
		}
	}

	return nil
}

func isGitRepository(dir string) bool {
	_, err := os.Stat(filepath.Join(dir, ".git"))
	return !os.IsNotExist(err)
}

func cleanAfter(ctx context.Context, bases []dep.Base) {
	fmt.Println(gotext.Get("removing untracked AUR files from cache..."))

	for i, base := range bases {
		dir := filepath.Join(config.BuildDir, base.Pkgbase())
		if !isGitRepository(dir) {
			continue
		}

		text.OperationInfoln(gotext.Get("Cleaning (%d/%d): %s", i+1, len(bases), text.Cyan(dir)))

		_, stderr, err := config.Runtime.CmdBuilder.Capture(
			config.Runtime.CmdBuilder.BuildGitCmd(
				ctx, dir, "reset", "--hard", "HEAD"))
		if err != nil {
			text.Errorln(gotext.Get("error resetting %s: %s", base.String(), stderr))
		}

		if err := config.Runtime.CmdBuilder.Show(
			config.Runtime.CmdBuilder.BuildGitCmd(
				ctx, dir, "clean", "-fx", "--exclude='*.pkg.*'")); err != nil {
			fmt.Fprintln(os.Stderr, err)
		}
	}
}