package cmd

import (
	"fmt"
	"os"

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

var hardDeleteFlag bool

var deleteCmd = &cobra.Command{
	Use:   "delete [filter...]",
	Short: "Delete tasks",
	Run: func(cmd *cobra.Command, args []string) {
		parsed := getParsedArgs(cmd)
		if err := deleteTasks(parsed.Filters, hardDeleteFlag); err != nil {
			fmt.Fprintf(os.Stderr, "Error: %v\n", err)
			os.Exit(1)
		}
	},
}

func init() {
	deleteCmd.Flags().BoolVar(&hardDeleteFlag, "hard", false, "Permanently remove task from database")
}

func deleteTasks(args []string, hard bool) error {
	filter, err := engine.ParseFilter(args)
	if err != nil {
		return err
	}

	// Load working set to resolve display IDs (matches done/modify pattern)
	ws, err := engine.LoadWorkingSet()
	if err != nil {
		return fmt.Errorf("failed to load working set: %w", err)
	}

	var tasks []*engine.Task

	if len(filter.IDs) > 0 {
		for _, id := range filter.IDs {
			task, err := ws.GetTaskByDisplayID(id)
			if err != nil {
				return err
			}
			tasks = append(tasks, task)
		}
	} else {
		tasks, err = engine.GetTasks(filter)
		if err != nil {
			return err
		}
	}

	if len(tasks) == 0 {
		return fmt.Errorf("no tasks matched filter")
	}

	action := "delete"
	if hard {
		action = "permanently delete"
	}

	if dryRunFlag {
		fmt.Print(engine.FormatTaskConfirmList(action, tasks, ws))
		fmt.Println("Dry run — no changes made.")
		return nil
	}

	if len(tasks) > 1 || hard {
		fmt.Print(engine.FormatTaskConfirmList(action, tasks, ws))
		if hard {
			fmt.Printf("This cannot be undone. Proceed? (y/N): ")
		} else {
			fmt.Printf("Proceed? (y/N): ")
		}
		var confirm string
		fmt.Scanln(&confirm)
		if confirm != "y" && confirm != "Y" {
			fmt.Println("Cancelled.")
			return nil
		}
	}

	for _, task := range tasks {
		task.Delete(hard)
		if !hard {
			engine.RecordUndo("delete", task.UUID)
		}
	}

	verb := "Deleted"
	if hard {
		verb = "Permanently deleted"
	}
	if len(tasks) == 1 {
		fmt.Printf("%s task %s\n", verb, engine.FormatTaskSummary(tasks[0], ws))
	} else {
		fmt.Printf("%s %d task(s).\n", verb, len(tasks))
	}
	return nil
}