package cmd

import (
	"fmt"

	"code.gitea.io/sdk/gitea"
	"forgejo.zerova.net/public/fgj-sid/internal/api"
	"forgejo.zerova.net/public/fgj-sid/internal/config"
	"github.com/spf13/cobra"
)

var milestoneIssuesCmd = &cobra.Command{
	Use:     "issues",
	Aliases: []string{"i"},
	Short:   "Manage issues associated with a milestone",
	Long:    "Associate or disassociate issues with a milestone.",
}

var milestoneIssuesAddCmd = &cobra.Command{
	Use:   "add <title-or-id> <issue-number>...",
	Short: "Add issues to a milestone",
	Long:  "Associate one or more issues with a milestone.",
	Example: `  # Add issues #5 and #7 to milestone "v1.0"
  fgj milestone issues add "v1.0" 5 7

  # Add issue #12 to milestone with ID 3 in a specific repo
  fgj milestone issues add 3 12 -R owner/repo`,
	Args: cobra.MinimumNArgs(2),
	RunE: runMilestoneIssuesAdd,
}

var milestoneIssuesRemoveCmd = &cobra.Command{
	Use:   "remove <title-or-id> <issue-number>...",
	Short: "Remove issues from a milestone",
	Long:  "Disassociate one or more issues from a milestone.",
	Example: `  # Remove issues #5 and #7 from milestone "v1.0"
  fgj milestone issues remove "v1.0" 5 7

  # Remove issue #12 from milestone with ID 3 in a specific repo
  fgj milestone issues remove 3 12 -R owner/repo`,
	Args: cobra.MinimumNArgs(2),
	RunE: runMilestoneIssuesRemove,
}

func init() {
	milestoneCmd.AddCommand(milestoneIssuesCmd)
	milestoneIssuesCmd.AddCommand(milestoneIssuesAddCmd)
	milestoneIssuesCmd.AddCommand(milestoneIssuesRemoveCmd)

	addRepoFlags(milestoneIssuesAddCmd)
	addRepoFlags(milestoneIssuesRemoveCmd)
}

func runMilestoneIssuesAdd(cmd *cobra.Command, args []string) error {
	repo, _ := cmd.Flags().GetString("repo")

	owner, name, err := parseRepo(repo)
	if err != nil {
		return err
	}

	cfg, err := config.Load()
	if err != nil {
		return err
	}

	client, err := api.NewClientFromConfig(cfg, "", getDetectedHost(), getCwd())
	if err != nil {
		return err
	}

	ios.StartSpinner("Fetching milestone...")
	ms, err := resolveMilestone(client, owner, name, args[0])
	ios.StopSpinner()
	if err != nil {
		return err
	}

	milestoneID := ms.ID
	cs := ios.ColorScheme()
	hadError := false

	for _, arg := range args[1:] {
		issueNum, parseErr := parseIssueArg(arg)
		if parseErr != nil {
			fmt.Fprintf(ios.ErrOut, "invalid issue number %q: %v\n", arg, parseErr)
			hadError = true
			continue
		}

		_, _, editErr := client.EditIssue(owner, name, issueNum, gitea.EditIssueOption{
			Milestone: &milestoneID,
		})
		if editErr != nil {
			fmt.Fprintf(ios.ErrOut, "failed to add issue #%d to milestone %q: %v\n", issueNum, ms.Title, editErr)
			hadError = true
			continue
		}

		fmt.Fprintf(ios.Out, "%s Added issue #%d to milestone %q\n", cs.SuccessIcon(), issueNum, ms.Title)
	}

	if hadError {
		return fmt.Errorf("one or more issues could not be added to milestone %q", ms.Title)
	}
	return nil
}

func runMilestoneIssuesRemove(cmd *cobra.Command, args []string) error {
	repo, _ := cmd.Flags().GetString("repo")

	owner, name, err := parseRepo(repo)
	if err != nil {
		return err
	}

	cfg, err := config.Load()
	if err != nil {
		return err
	}

	client, err := api.NewClientFromConfig(cfg, "", getDetectedHost(), getCwd())
	if err != nil {
		return err
	}

	ios.StartSpinner("Fetching milestone...")
	ms, err := resolveMilestone(client, owner, name, args[0])
	ios.StopSpinner()
	if err != nil {
		return err
	}

	cs := ios.ColorScheme()
	hadError := false
	var zero int64 = 0

	for _, arg := range args[1:] {
		issueNum, parseErr := parseIssueArg(arg)
		if parseErr != nil {
			fmt.Fprintf(ios.ErrOut, "invalid issue number %q: %v\n", arg, parseErr)
			hadError = true
			continue
		}

		// Setting Milestone to a pointer-to-zero clears the milestone association
		// in Gitea's API (PATCH /repos/{owner}/{repo}/issues/{num} with {"milestone": 0}).
		_, _, editErr := client.EditIssue(owner, name, issueNum, gitea.EditIssueOption{
			Milestone: &zero,
		})
		if editErr != nil {
			fmt.Fprintf(ios.ErrOut, "failed to remove issue #%d from milestone %q: %v\n", issueNum, ms.Title, editErr)
			hadError = true
			continue
		}

		fmt.Fprintf(ios.Out, "%s Removed issue #%d from milestone %q\n", cs.SuccessIcon(), issueNum, ms.Title)
	}

	if hadError {
		return fmt.Errorf("one or more issues could not be removed from milestone %q", ms.Title)
	}
	return nil
}