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package cmd

import (
	"fmt"
	"strings"

	"github.com/spf13/cobra"
)

var (
	milestoneRepo        string
	milestoneState       string
	milestoneTitle       string
	milestoneDue         string
	milestoneDescription string
)

func init() {
	msCmd := &cobra.Command{
		Use:     "milestone",
		Aliases: []string{"milestones"},
		Short:   "Work with milestones",
	}
	msCmd.PersistentFlags().StringVarP(&milestoneRepo, "repo", "R", "", "target repo as owner/repo (default: current git remote)")

	listCmd := &cobra.Command{
		Use:   "list",
		Short: "List milestones",
		Args:  cobra.NoArgs,
		RunE:  runMilestoneList,
	}
	listCmd.Flags().StringVar(&milestoneState, "state", "open", "open | closed | all")

	createCmd := &cobra.Command{
		Use:   "create",
		Short: "Create a milestone",
		Args:  cobra.NoArgs,
		RunE:  runMilestoneCreate,
	}
	createCmd.Flags().StringVarP(&milestoneTitle, "title", "t", "", "title (required)")
	createCmd.Flags().StringVarP(&milestoneDescription, "description", "d", "", "description")
	createCmd.Flags().StringVar(&milestoneDue, "due", "", "due date, YYYY-MM-DD")

	closeCmd := &cobra.Command{
		Use:   "close <id>",
		Short: "Close a milestone (by id; see `milestone list`)",
		Args:  cobra.ExactArgs(1),
		RunE:  func(cmd *cobra.Command, args []string) error { return runMilestoneSetState(cmd, args, "closed") },
	}

	reopenCmd := &cobra.Command{
		Use:   "reopen <id>",
		Short: "Reopen a closed milestone",
		Args:  cobra.ExactArgs(1),
		RunE:  func(cmd *cobra.Command, args []string) error { return runMilestoneSetState(cmd, args, "open") },
	}

	deleteCmd := &cobra.Command{
		Use:   "delete <id>",
		Short: "Delete a milestone (issues keep going, milestone cleared)",
		Args:  cobra.ExactArgs(1),
		RunE:  runMilestoneDelete,
	}

	msCmd.AddCommand(listCmd, createCmd, closeCmd, reopenCmd, deleteCmd)
	rootCmd.AddCommand(msCmd)
}

func runMilestoneList(cmd *cobra.Command, _ []string) error {
	client, err := newClient()
	if err != nil {
		return err
	}
	owner, repo, err := resolveRepo(milestoneRepo)
	if err != nil {
		return err
	}
	mses, err := client.ListMilestones(cmd.Context(), owner, repo, milestoneState)
	if err != nil {
		return err
	}
	if flagJSON {
		return printJSON(cmd.OutOrStdout(), mses)
	}
	if len(mses) == 0 {
		fmt.Fprintln(cmd.OutOrStdout(), "No milestones.")
		return nil
	}
	tw := newTabw(cmd.OutOrStdout())
	fmt.Fprintln(tw, "ID\tSTATE\tDUE\tPROGRESS\tTITLE")
	for _, m := range mses {
		progress := fmt.Sprintf("%d/%d", m.ClosedCount, m.OpenCount+m.ClosedCount)
		fmt.Fprintf(tw, "%s\t%s\t%s\t%s\t%s\n", m.ID, m.State, dash(deref(m.DueOn)), progress, m.Title)
	}
	tw.Flush()
	return nil
}

func deref(s *string) string {
	if s == nil {
		return ""
	}
	return *s
}

func runMilestoneCreate(cmd *cobra.Command, _ []string) error {
	if strings.TrimSpace(milestoneTitle) == "" {
		return fmt.Errorf("--title is required")
	}
	client, err := newClient()
	if err != nil {
		return err
	}
	owner, repo, err := resolveRepo(milestoneRepo)
	if err != nil {
		return err
	}
	m, err := client.CreateMilestone(cmd.Context(), owner, repo, milestoneTitle, milestoneDescription, milestoneDue)
	if err != nil {
		return err
	}
	if flagJSON {
		return printJSON(cmd.OutOrStdout(), m)
	}
	fmt.Fprintf(cmd.OutOrStdout(), "Created milestone %s (%s)\n", m.Title, m.ID)
	return nil
}

func runMilestoneSetState(cmd *cobra.Command, args []string, state string) error {
	client, err := newClient()
	if err != nil {
		return err
	}
	owner, repo, err := resolveRepo(milestoneRepo)
	if err != nil {
		return err
	}
	m, err := client.UpdateMilestone(cmd.Context(), owner, repo, args[0], map[string]any{"state": state})
	if err != nil {
		return err
	}
	if flagJSON {
		return printJSON(cmd.OutOrStdout(), m)
	}
	fmt.Fprintf(cmd.OutOrStdout(), "Milestone %s is now %s.\n", m.Title, m.State)
	return nil
}

func runMilestoneDelete(cmd *cobra.Command, args []string) error {
	client, err := newClient()
	if err != nil {
		return err
	}
	owner, repo, err := resolveRepo(milestoneRepo)
	if err != nil {
		return err
	}
	if err := client.DeleteMilestone(cmd.Context(), owner, repo, args[0]); err != nil {
		return err
	}
	fmt.Fprintf(cmd.OutOrStdout(), "Deleted milestone %s.\n", args[0])
	return nil
}