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package cmd

import (
	"fmt"
	"strconv"
	"strings"

	"github.com/spf13/cobra"
)

var (
	issueRepo      string
	issueState     string
	issueTitle     string
	issueBody      string
	issueLabels    string
	issueMilestone string
	issueAssignee  string
	issueRemove    bool
)

func init() {
	issueCmd := &cobra.Command{
		Use:     "issue",
		Aliases: []string{"issues"},
		Short:   "Work with issues (and labels)",
	}
	issueCmd.PersistentFlags().StringVarP(&issueRepo, "repo", "R", "", "target repo as owner/repo (default: current git remote)")

	listCmd := &cobra.Command{
		Use:   "list",
		Short: "List issues",
		Args:  cobra.NoArgs,
		RunE:  runIssueList,
	}
	listCmd.Flags().StringVar(&issueState, "state", "open", "open | closed | all")
	addPaging(listCmd)

	viewCmd := &cobra.Command{
		Use:   "view <number>",
		Short: "Show an issue with its comments",
		Args:  cobra.ExactArgs(1),
		RunE:  runIssueView,
	}

	createCmd := &cobra.Command{
		Use:   "create",
		Short: "Open an issue",
		Args:  cobra.NoArgs,
		RunE:  runIssueCreate,
	}
	createCmd.Flags().StringVarP(&issueTitle, "title", "t", "", "title (required)")
	createCmd.Flags().StringVarP(&issueBody, "body", "b", "", "description body ('-' reads stdin)")

	closeCmd := &cobra.Command{
		Use:   "close <number>",
		Short: "Close an issue",
		Args:  cobra.ExactArgs(1),
		RunE:  func(cmd *cobra.Command, args []string) error { return runIssueState(cmd, args, "closed") },
	}

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

	commentCmd := &cobra.Command{
		Use:   "comment <number>",
		Short: "Comment on an issue",
		Args:  cobra.ExactArgs(1),
		RunE:  runIssueComment,
	}
	commentCmd.Flags().StringVarP(&issueBody, "body", "b", "", "comment body ('-' reads stdin)")

	labelCmd := &cobra.Command{
		Use:   "label <number>",
		Short: "Replace an issue's labels (by name, comma-separated; --clear empties)",
		Args:  cobra.ExactArgs(1),
		RunE:  runIssueLabel,
	}
	labelCmd.Flags().StringVar(&issueLabels, "labels", "", "comma-separated label names")
	labelCmd.Flags().BoolVar(&issueRemove, "clear", false, "remove all labels")

	milestoneCmd := &cobra.Command{
		Use:   "milestone <number>",
		Short: "Assign an issue to a milestone (by title or id; --clear removes)",
		Args:  cobra.ExactArgs(1),
		RunE:  runIssueMilestone,
	}
	milestoneCmd.Flags().StringVar(&issueMilestone, "milestone", "", "milestone title or id")
	milestoneCmd.Flags().BoolVar(&issueRemove, "clear", false, "remove the milestone")

	assignCmd := &cobra.Command{
		Use:   "assign <number>",
		Short: "Add or remove an assignee (--remove)",
		Args:  cobra.ExactArgs(1),
		RunE:  runIssueAssign,
	}
	assignCmd.Flags().StringVar(&issueAssignee, "user", "", "user handle")
	assignCmd.Flags().BoolVar(&issueRemove, "remove", false, "remove instead of add")

	labelsCmd := &cobra.Command{
		Use:   "labels",
		Short: "List the repo's labels",
		Args:  cobra.NoArgs,
		RunE:  runIssueLabelsList,
	}

	issueCmd.AddCommand(listCmd, viewCmd, createCmd, closeCmd, reopenCmd, commentCmd, labelCmd, milestoneCmd, assignCmd, labelsCmd)
	rootCmd.AddCommand(issueCmd)
}

// issueNumber parses a positive issue number argument.
func issueNumber(arg string) (int, error) {
	n, err := strconv.Atoi(arg)
	if err != nil || n <= 0 {
		return 0, fmt.Errorf("invalid issue number %q", arg)
	}
	return n, nil
}

// labelNames splits a comma-separated --labels value.
func labelNames(s string) []string {
	if strings.TrimSpace(s) == "" {
		return []string{}
	}
	parts := strings.Split(s, ",")
	out := make([]string, 0, len(parts))
	for _, p := range parts {
		if name := strings.TrimSpace(p); name != "" {
			out = append(out, name)
		}
	}
	return out
}

func runIssueList(cmd *cobra.Command, _ []string) error {
	client, err := newClient()
	if err != nil {
		return err
	}
	owner, repo, err := resolveRepo(issueRepo)
	if err != nil {
		return err
	}
	page, err := client.ListIssues(cmd.Context(), owner, repo, issueState, pageFlag, perPageFlag)
	if err != nil {
		return err
	}
	if flagJSON {
		return printJSON(cmd.OutOrStdout(), page)
	}
	if len(page.Items) == 0 {
		fmt.Fprintln(cmd.OutOrStdout(), "No issues.")
		return nil
	}
	tw := newTabw(cmd.OutOrStdout())
	fmt.Fprintln(tw, "#\tSTATE\tLABELS\tMILESTONE\tTITLE")
	for _, i := range page.Items {
		var labels, milestone string
		if len(i.Labels) > 0 {
			names := make([]string, len(i.Labels))
			for j, l := range i.Labels {
				names[j] = l.Name
			}
			labels = strings.Join(names, ",")
		}
		if i.Milestone != nil {
			milestone = i.Milestone.Title
		}
		fmt.Fprintf(tw, "%d\t%s\t%s\t%s\t%s\n", i.Number, i.State, dash(labels), dash(milestone), i.Title)
	}
	tw.Flush()
	printPageFooter(cmd, page.Page)
	return nil
}

func runIssueView(cmd *cobra.Command, args []string) error {
	client, err := newClient()
	if err != nil {
		return err
	}
	owner, repo, err := resolveRepo(issueRepo)
	if err != nil {
		return err
	}
	n, err := issueNumber(args[0])
	if err != nil {
		return err
	}
	i, err := client.GetIssue(cmd.Context(), owner, repo, n)
	if err != nil {
		return err
	}
	if flagJSON {
		return printJSON(cmd.OutOrStdout(), i)
	}
	out := cmd.OutOrStdout()
	state := i.State
	if i.Milestone != nil {
		state += " · " + i.Milestone.Title
	}
	fmt.Fprintf(out, "Issue #%d  %s  [%s]\n", i.Number, i.Title, state)
	fmt.Fprintf(out, "by %s · %s\n", dash(i.Author), humanTime(i.CreatedAt))
	if len(i.Labels) > 0 {
		names := make([]string, len(i.Labels))
		for j, l := range i.Labels {
			names[j] = l.Name
		}
		fmt.Fprintf(out, "labels: %s\n", strings.Join(names, ", "))
	}
	if len(i.Assignees) > 0 {
		handles := make([]string, len(i.Assignees))
		for j, a := range i.Assignees {
			handles[j] = a.Handle
		}
		fmt.Fprintf(out, "assignees: %s\n", strings.Join(handles, ", "))
	}
	fmt.Fprintln(out)
	if i.Body != "" {
		fmt.Fprintln(out, i.Body)
	}
	for _, c := range i.Comments {
		fmt.Fprintf(out, "\n--- %s (%s) ---\n%s\n", c.Author, humanTime(c.CreatedAt), c.Body)
	}
	return nil
}

// bodyOrStdin resolves a --body flag value, reading stdin when it is "-".
func bodyOrStdin(cmd *cobra.Command, body string) (string, error) {
	if body != "-" {
		return body, nil
	}
	var sb strings.Builder
	buf := make([]byte, 32*1024)
	in := cmd.InOrStdin()
	for {
		n, err := in.Read(buf)
		sb.Write(buf[:n])
		if err != nil {
			break
		}
	}
	return strings.TrimRight(sb.String(), "\n"), nil
}

func runIssueCreate(cmd *cobra.Command, _ []string) error {
	if issueTitle == "" {
		return fmt.Errorf("--title is required")
	}
	body, err := bodyOrStdin(cmd, issueBody)
	if err != nil {
		return err
	}
	client, err := newClient()
	if err != nil {
		return err
	}
	owner, repo, err := resolveRepo(issueRepo)
	if err != nil {
		return err
	}
	i, err := client.CreateIssue(cmd.Context(), owner, repo, issueTitle, body)
	if err != nil {
		return err
	}
	if flagJSON {
		return printJSON(cmd.OutOrStdout(), i)
	}
	fmt.Fprintf(cmd.OutOrStdout(), "Opened issue #%d: %s\n", i.Number, i.Title)
	return nil
}

func runIssueState(cmd *cobra.Command, args []string, state string) error {
	client, err := newClient()
	if err != nil {
		return err
	}
	owner, repo, err := resolveRepo(issueRepo)
	if err != nil {
		return err
	}
	n, err := issueNumber(args[0])
	if err != nil {
		return err
	}
	i, err := client.SetIssueState(cmd.Context(), owner, repo, n, state)
	if err != nil {
		return err
	}
	if flagJSON {
		return printJSON(cmd.OutOrStdout(), i)
	}
	fmt.Fprintf(cmd.OutOrStdout(), "Issue #%d is now %s.\n", i.Number, i.State)
	return nil
}

func runIssueComment(cmd *cobra.Command, args []string) error {
	body, err := bodyOrStdin(cmd, issueBody)
	if err != nil {
		return err
	}
	if strings.TrimSpace(body) == "" {
		return fmt.Errorf("--body is required")
	}
	client, err := newClient()
	if err != nil {
		return err
	}
	owner, repo, err := resolveRepo(issueRepo)
	if err != nil {
		return err
	}
	n, err := issueNumber(args[0])
	if err != nil {
		return err
	}
	c, err := client.CommentIssue(cmd.Context(), owner, repo, n, body)
	if err != nil {
		return err
	}
	if flagJSON {
		return printJSON(cmd.OutOrStdout(), c)
	}
	fmt.Fprintf(cmd.OutOrStdout(), "Commented on issue #%d.\n", n)
	return nil
}

func runIssueLabel(cmd *cobra.Command, args []string) error {
	client, err := newClient()
	if err != nil {
		return err
	}
	owner, repo, err := resolveRepo(issueRepo)
	if err != nil {
		return err
	}
	n, err := issueNumber(args[0])
	if err != nil {
		return err
	}
	names := []string{}
	if !issueRemove {
		names = labelNames(issueLabels)
	}
	if err := client.SetIssueLabels(cmd.Context(), owner, repo, n, names); err != nil {
		return err
	}
	if len(names) == 0 {
		fmt.Fprintf(cmd.OutOrStdout(), "Cleared labels on issue #%d.\n", n)
	} else {
		fmt.Fprintf(cmd.OutOrStdout(), "Set labels on issue #%d: %s\n", n, strings.Join(names, ", "))
	}
	return nil
}

func runIssueMilestone(cmd *cobra.Command, args []string) error {
	client, err := newClient()
	if err != nil {
		return err
	}
	owner, repo, err := resolveRepo(issueRepo)
	if err != nil {
		return err
	}
	n, err := issueNumber(args[0])
	if err != nil {
		return err
	}
	ref := issueMilestone
	if issueRemove {
		ref = ""
	}
	if err := client.SetIssueMilestone(cmd.Context(), owner, repo, n, ref); err != nil {
		return err
	}
	if ref == "" {
		fmt.Fprintf(cmd.OutOrStdout(), "Removed the milestone from issue #%d.\n", n)
	} else {
		fmt.Fprintf(cmd.OutOrStdout(), "Set issue #%d's milestone to %s.\n", n, ref)
	}
	return nil
}

func runIssueAssign(cmd *cobra.Command, args []string) error {
	if issueAssignee == "" {
		return fmt.Errorf("--user is required")
	}
	client, err := newClient()
	if err != nil {
		return err
	}
	owner, repo, err := resolveRepo(issueRepo)
	if err != nil {
		return err
	}
	n, err := issueNumber(args[0])
	if err != nil {
		return err
	}
	op := "add"
	if issueRemove {
		op = "remove"
	}
	if err := client.SetIssueAssignee(cmd.Context(), owner, repo, n, op, issueAssignee); err != nil {
		return err
	}
	verb := "Assigned"
	if issueRemove {
		verb = "Unassigned"
	}
	fmt.Fprintf(cmd.OutOrStdout(), "%s %s on issue #%d.\n", verb, issueAssignee, n)
	return nil
}

func runIssueLabelsList(cmd *cobra.Command, _ []string) error {
	client, err := newClient()
	if err != nil {
		return err
	}
	owner, repo, err := resolveRepo(issueRepo)
	if err != nil {
		return err
	}
	labels, err := client.ListLabels(cmd.Context(), owner, repo)
	if err != nil {
		return err
	}
	if flagJSON {
		return printJSON(cmd.OutOrStdout(), labels)
	}
	if len(labels) == 0 {
		fmt.Fprintln(cmd.OutOrStdout(), "No labels.")
		return nil
	}
	tw := newTabw(cmd.OutOrStdout())
	fmt.Fprintln(tw, "NAME\tCOLOR")
	for _, l := range labels {
		fmt.Fprintf(tw, "%s\t#%s\n", l.Name, l.Color)
	}
	tw.Flush()
	return nil
}