package cmd

import (
	"fmt"
	"os"
	"strconv"
	"strings"
	"text/tabwriter"

	"code.gitea.io/sdk/gitea"
	"github.com/spf13/cobra"
	"codeberg.org/romaintb/fgj/internal/api"
	"codeberg.org/romaintb/fgj/internal/config"
)

var issueCmd = &cobra.Command{
	Use:   "issue",
	Short: "Manage issues",
	Long:  "Create, view, list, and manage issues.",
}

var issueListCmd = &cobra.Command{
	Use:   "list [flags]",
	Short: "List issues",
	Long:  "List issues in a repository.",
	RunE:  runIssueList,
}

var issueViewCmd = &cobra.Command{
	Use:   "view <number>",
	Short: "View an issue",
	Long:  "Display detailed information about an issue.",
	Args:  cobra.ExactArgs(1),
	RunE:  runIssueView,
}

var issueCreateCmd = &cobra.Command{
	Use:   "create",
	Short: "Create an issue",
	Long:  "Create a new issue.",
	RunE:  runIssueCreate,
}

var issueCommentCmd = &cobra.Command{
	Use:   "comment <number>",
	Short: "Add a comment to an issue",
	Long:  "Add a comment to an existing issue.",
	Args:  cobra.ExactArgs(1),
	RunE:  runIssueComment,
}

var issueCloseCmd = &cobra.Command{
	Use:   "close <number>",
	Short: "Close an issue",
	Long:  "Close an existing issue.",
	Args:  cobra.ExactArgs(1),
	RunE:  runIssueClose,
}

func init() {
	rootCmd.AddCommand(issueCmd)
	issueCmd.AddCommand(issueListCmd)
	issueCmd.AddCommand(issueViewCmd)
	issueCmd.AddCommand(issueCreateCmd)
	issueCmd.AddCommand(issueCommentCmd)
	issueCmd.AddCommand(issueCloseCmd)

	issueListCmd.Flags().StringP("repo", "R", "", "Repository in owner/name format")
	issueListCmd.Flags().StringP("state", "s", "open", "Filter by state: open, closed, all")

	issueViewCmd.Flags().StringP("repo", "R", "", "Repository in owner/name format")

	issueCreateCmd.Flags().StringP("repo", "R", "", "Repository in owner/name format")
	issueCreateCmd.Flags().StringP("title", "t", "", "Title for the issue")
	issueCreateCmd.Flags().StringP("body", "b", "", "Body for the issue")

	issueCommentCmd.Flags().StringP("repo", "R", "", "Repository in owner/name format")
	issueCommentCmd.Flags().StringP("body", "b", "", "Comment body")

	issueCloseCmd.Flags().StringP("repo", "R", "", "Repository in owner/name format")
}

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

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

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

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

	var stateType gitea.StateType
	switch strings.ToLower(state) {
	case "open":
		stateType = gitea.StateOpen
	case "closed":
		stateType = gitea.StateClosed
	case "all":
		stateType = gitea.StateAll
	default:
		return fmt.Errorf("invalid state: %s", state)
	}

	issues, _, err := client.ListRepoIssues(owner, name, gitea.ListIssueOption{
		State: stateType,
	})
	if err != nil {
		return fmt.Errorf("failed to list issues: %w", err)
	}

	if len(issues) == 0 {
		fmt.Printf("No %s issues in %s/%s\n", state, owner, name)
		return nil
	}

	w := tabwriter.NewWriter(os.Stdout, 0, 0, 2, ' ', 0)
	fmt.Fprintf(w, "NUMBER\tTITLE\tSTATE\n")
	for _, issue := range issues {
		if issue.PullRequest == nil {
			fmt.Fprintf(w, "#%d\t%s\t%s\n", issue.Index, issue.Title, issue.State)
		}
	}
	w.Flush()

	return nil
}

func runIssueView(cmd *cobra.Command, args []string) error {
	repo, _ := cmd.Flags().GetString("repo")
	issueNumber, err := strconv.ParseInt(args[0], 10, 64)
	if err != nil {
		return fmt.Errorf("invalid issue number: %w", err)
	}

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

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

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

	issue, _, err := client.GetIssue(owner, name, issueNumber)
	if err != nil {
		return fmt.Errorf("failed to get issue: %w", err)
	}

	fmt.Printf("Issue #%d\n", issue.Index)
	fmt.Printf("Title: %s\n", issue.Title)
	fmt.Printf("State: %s\n", issue.State)
	fmt.Printf("Author: %s\n", issue.Poster.UserName)
	fmt.Printf("Created: %s\n", issue.Created.Format("2006-01-02 15:04:05"))
	fmt.Printf("Updated: %s\n", issue.Updated.Format("2006-01-02 15:04:05"))
	if issue.Body != "" {
		fmt.Printf("\n%s\n", issue.Body)
	}

	comments, _, err := client.ListIssueComments(owner, name, issueNumber, gitea.ListIssueCommentOptions{})
	if err == nil && len(comments) > 0 {
		fmt.Printf("\nComments (%d):\n", len(comments))
		for _, comment := range comments {
			fmt.Printf("\n---\n%s (@%s) - %s\n%s\n",
				comment.Poster.FullName,
				comment.Poster.UserName,
				comment.Created.Format("2006-01-02 15:04:05"),
				comment.Body)
		}
	}

	return nil
}

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

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

	if title == "" {
		return fmt.Errorf("title is required")
	}

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

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

	issue, _, err := client.CreateIssue(owner, name, gitea.CreateIssueOption{
		Title: title,
		Body:  body,
	})
	if err != nil {
		return fmt.Errorf("failed to create issue: %w", err)
	}

	fmt.Printf("Issue created: #%d\n", issue.Index)
	fmt.Printf("View at: %s\n", issue.HTMLURL)

	return nil
}

func runIssueComment(cmd *cobra.Command, args []string) error {
	repo, _ := cmd.Flags().GetString("repo")
	body, _ := cmd.Flags().GetString("body")
	issueNumber, err := strconv.ParseInt(args[0], 10, 64)
	if err != nil {
		return fmt.Errorf("invalid issue number: %w", err)
	}

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

	if body == "" {
		return fmt.Errorf("comment body is required")
	}

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

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

	comment, _, err := client.CreateIssueComment(owner, name, issueNumber, gitea.CreateIssueCommentOption{
		Body: body,
	})
	if err != nil {
		return fmt.Errorf("failed to create comment: %w", err)
	}

	fmt.Printf("Comment added to issue #%d\n", issueNumber)
	fmt.Printf("View at: %s\n", comment.HTMLURL)

	return nil
}

func runIssueClose(cmd *cobra.Command, args []string) error {
	repo, _ := cmd.Flags().GetString("repo")
	issueNumber, err := strconv.ParseInt(args[0], 10, 64)
	if err != nil {
		return fmt.Errorf("invalid issue number: %w", err)
	}

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

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

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

	stateClosed := gitea.StateClosed
	_, _, err = client.EditIssue(owner, name, issueNumber, gitea.EditIssueOption{
		State: &stateClosed,
	})
	if err != nil {
		return fmt.Errorf("failed to close issue: %w", err)
	}

	fmt.Printf("Issue #%d closed\n", issueNumber)

	return nil
}