package cmd

import (
	"fmt"
	"os"

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

var logCmd = &cobra.Command{
	Use:   "log [filter]",
	Short: "Show change history for a task",
	Long: `Show the change history for a single task, pulled from the change log.

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

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

	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 task *engine.Task

	if len(filter.IDs) > 0 {
		if len(filter.IDs) != 1 {
			return fmt.Errorf("log requires exactly one task")
		}
		task, err = ws.GetTaskByDisplayID(filter.IDs[0])
		if err != nil {
			return err
		}
	} 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")
		}
		if len(tasks) > 1 {
			return fmt.Errorf("log requires exactly one task (filter matched %d)", len(tasks))
		}
		task = tasks[0]
	}

	entries, err := engine.GetTaskHistory(task.UUID)
	if err != nil {
		return err
	}

	fmt.Printf("History for: %s\n\n", task.Description)
	fmt.Print(engine.FormatTaskHistory(entries))
	return nil
}