package cmd

import (
	"fmt"
	"os"

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

var listCmd = &cobra.Command{
	Use:   "list [filter...]",
	Short: "List tasks",
	Long: `List tasks matching the filter criteria.

Examples:
  opal list                    # List all pending tasks
  opal list +home              # List tasks with +home tag
  opal list project:backend    # List backend project tasks
  opal list priority:H         # List high priority tasks
  opal 2 list                  # List using filter 2 (flexible syntax)`,
	Run: func(cmd *cobra.Command, args []string) {
		parsed := getParsedArgs(cmd)
		if err := listTasks(parsed.Filters); err != nil {
			fmt.Fprintf(os.Stderr, "Error: %v\n", err)
			os.Exit(1)
		}
	},
}

func listTasks(args []string) error {
	// Parse filter
	var filter *engine.Filter
	var err error

	if len(args) == 0 {
		filter = engine.DefaultFilter()
	} else {
		filter, err = engine.ParseFilter(args)
		if err != nil {
			return fmt.Errorf("failed to parse filter: %w", err)
		}
	}

	// Build working set
	ws, err := engine.BuildWorkingSet(filter)
	if err != nil {
		return fmt.Errorf("failed to build working set: %w", err)
	}

	// Get tasks
	tasks := ws.GetTasks()

	// Display
	fmt.Println(engine.FormatTaskList(tasks, ws))

	return nil
}