package cmd

import (
	"fmt"
	"os"
	"time"

	"git.jnss.me/joakim/opal/internal/engine"
	"github.com/spf13/cobra"
)

var olderFlag string

var cleanCmd = &cobra.Command{
	Use:   "clean",
	Short: "Purge soft-deleted tasks from the database",
	Run: func(cmd *cobra.Command, args []string) {
		if err := cleanTasks(); err != nil {
			fmt.Fprintf(os.Stderr, "Error: %v\n", err)
			os.Exit(1)
		}
	},
}

func init() {
	cleanCmd.Flags().StringVar(&olderFlag, "older", "", "Only purge tasks deleted longer than this duration ago (e.g. 30d, 1w)")
}

func cleanTasks() error {
	var olderThan *time.Duration
	if olderFlag != "" {
		d, err := engine.ParseRecurrencePattern(olderFlag)
		if err != nil {
			return fmt.Errorf("invalid duration %q: %w", olderFlag, err)
		}
		olderThan = &d
	}

	tasks, err := engine.GetDeletedTasks(olderThan)
	if err != nil {
		return err
	}

	if len(tasks) == 0 {
		fmt.Println("No deleted tasks to purge.")
		return nil
	}

	if dryRunFlag {
		fmt.Printf("Would permanently remove %d deleted task(s).\n", len(tasks))
		return nil
	}

	if len(tasks) > 1 {
		fmt.Printf("Permanently remove %d deleted task(s)? This cannot be undone. (y/N): ", len(tasks))
		var confirm string
		fmt.Scanln(&confirm)
		if confirm != "y" && confirm != "Y" {
			fmt.Println("Cancelled.")
			return nil
		}
	}

	for _, task := range tasks {
		if err := task.Delete(true); err != nil {
			return fmt.Errorf("failed to purge task %s: %w", task.UUID, err)
		}
	}

	fmt.Printf("Purged %d deleted task(s).\n", len(tasks))

	if err := engine.CleanupChangeLog(); err != nil {
		fmt.Fprintf(os.Stderr, "Warning: failed to clean up change log: %v\n", err)
	}

	return nil
}