package cmd

import (
	"fmt"
	"os"

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

var uncompleteCmd = &cobra.Command{
	Use:   "uncomplete [filter...]",
	Short: "Restore a completed task to pending",
	Long: `Restore a completed task back to pending status.

Unlike undo, this is a targeted action that works on any completed task
regardless of when it was completed.

Examples:
  opal 2 uncomplete
  opal uncomplete +errand`,
	Run: func(cmd *cobra.Command, args []string) {
		parsed := getParsedArgs(cmd)
		if err := uncompleteTasks(parsed.Filters); err != nil {
			fmt.Fprintf(os.Stderr, "Error: %v\n", err)
			os.Exit(1)
		}
	},
}

func uncompleteTasks(args []string) error {
	if len(args) == 0 {
		return fmt.Errorf("no task specified")
	}

	filter, err := engine.ParseFilter(args)
	if err != nil {
		return fmt.Errorf("failed to parse filter: %w", err)
	}

	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 fmt.Errorf("failed to get tasks: %w", err)
		}
	}

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

	uncompleted := 0
	for _, task := range tasks {
		if task.Status != engine.StatusCompleted {
			fmt.Fprintf(os.Stderr, "Warning: task %s is not completed, skipping\n", task.UUID)
			continue
		}
		task.Status = engine.StatusPending
		task.End = nil
		if err := task.Save(); err != nil {
			fmt.Fprintf(os.Stderr, "Warning: failed to uncomplete task %s: %v\n", task.UUID, err)
		} else {
			uncompleted++
		}
	}

	if uncompleted == 1 {
		fmt.Printf("Restored task %s to pending\n", engine.FormatTaskSummary(tasks[0], ws))
	} else {
		fmt.Printf("Restored %d task(s) to pending.\n", uncompleted)
	}
	return nil
}