package cmd

import (
	"fmt"
	"os"
	"strings"

	"github.com/frenocorp/pop/internal/api"
	"github.com/frenocorp/pop/internal/config"
	internalmail "github.com/frenocorp/pop/internal/mail"
	"github.com/spf13/cobra"
)

func bulkCmd() *cobra.Command {
	cmd := &cobra.Command{
		Use:   "bulk",
		Short: "Bulk operations on messages",
		Long:  `Perform operations on multiple messages at once: delete, trash, star, mark read.`,
	}

	cmd.AddCommand(bulkDeleteCmd())
	cmd.AddCommand(bulkTrashCmd())
	cmd.AddCommand(bulkStarCmd())
	cmd.AddCommand(bulkUnstarCmd())
	cmd.AddCommand(bulkMarkReadCmd())
	cmd.AddCommand(bulkMarkUnreadCmd())

	return cmd
}

func bulkDeleteCmd() *cobra.Command {
	var ids, idsFile string

	cmd := &cobra.Command{
		Use:   "delete",
		Short: "Permanently delete multiple messages",
		Long:  `Permanently delete multiple messages from ProtonMail. Use --ids for comma-separated IDs or --ids-file for a file with one ID per line.`,
		RunE: func(cmd *cobra.Command, args []string) error {
			messageIDs := collectMessageIDs(ids, idsFile)
			if len(messageIDs) == 0 {
				return fmt.Errorf("no message IDs provided")
			}

			cfgMgr := config.NewConfigManager()
			cfg, err := cfgMgr.Load()
			if err != nil {
				return fmt.Errorf("failed to load config: %w", err)
			}

			session, sessionMgr, err := checkAuthenticatedWithManager()
			if err != nil {
				return err
			}

			client := api.NewProtonMailClient(cfg, sessionMgr)
			client.SetAuthHeader(session.AccessToken)
			mailClient := internalmail.NewClient(client)

			result, err := mailClient.BulkDelete(messageIDs)
			if err != nil {
				return fmt.Errorf("failed to bulk delete: %w", err)
			}

			fmt.Printf("Deleted %d/%d messages\n", result.SuccessCount, result.Total)
			if len(result.Errors) > 0 {
				fmt.Fprintln(os.Stderr, "Errors:")
				for _, e := range result.Errors {
					fmt.Fprintf(os.Stderr, "  - %s: %s\n", e.MessageID, e.Error)
				}
			}

			return nil
		},
	}

	cmd.Flags().StringVarP(&ids, "ids", "i", "", "Comma-separated message IDs")
	cmd.Flags().StringVarP(&idsFile, "ids-file", "f", "", "File with one message ID per line")

	return cmd
}

func bulkTrashCmd() *cobra.Command {
	var ids, idsFile string

	cmd := &cobra.Command{
		Use:   "trash",
		Short: "Move multiple messages to trash",
		Long:  `Move multiple messages to the trash folder. Use --ids for comma-separated IDs or --ids-file for a file with one ID per line.`,
		RunE: func(cmd *cobra.Command, args []string) error {
			messageIDs := collectMessageIDs(ids, idsFile)
			if len(messageIDs) == 0 {
				return fmt.Errorf("no message IDs provided")
			}

			cfgMgr := config.NewConfigManager()
			cfg, err := cfgMgr.Load()
			if err != nil {
				return fmt.Errorf("failed to load config: %w", err)
			}

			session, sessionMgr, err := checkAuthenticatedWithManager()
			if err != nil {
				return err
			}

			client := api.NewProtonMailClient(cfg, sessionMgr)
			client.SetAuthHeader(session.AccessToken)
			mailClient := internalmail.NewClient(client)

			result, err := mailClient.BulkTrash(messageIDs, session.MailPassphrase)
			if err != nil {
				return fmt.Errorf("failed to bulk trash: %w", err)
			}

			fmt.Printf("Trashed %d/%d messages\n", result.SuccessCount, result.Total)
			if len(result.Errors) > 0 {
				fmt.Fprintln(os.Stderr, "Errors:")
				for _, e := range result.Errors {
					fmt.Fprintf(os.Stderr, "  - %s: %s\n", e.MessageID, e.Error)
				}
			}

			return nil
		},
	}

	cmd.Flags().StringVarP(&ids, "ids", "i", "", "Comma-separated message IDs")
	cmd.Flags().StringVarP(&idsFile, "ids-file", "f", "", "File with one message ID per line")

	return cmd
}

func bulkStarCmd() *cobra.Command {
	var ids, idsFile string

	cmd := &cobra.Command{
		Use:   "star",
		Short: "Star multiple messages",
		Long:  `Star multiple messages at once. Use --ids for comma-separated IDs or --ids-file for a file with one ID per line.`,
		RunE: func(cmd *cobra.Command, args []string) error {
			messageIDs := collectMessageIDs(ids, idsFile)
			if len(messageIDs) == 0 {
				return fmt.Errorf("no message IDs provided")
			}

			cfgMgr := config.NewConfigManager()
			cfg, err := cfgMgr.Load()
			if err != nil {
				return fmt.Errorf("failed to load config: %w", err)
			}

			session, sessionMgr, err := checkAuthenticatedWithManager()
			if err != nil {
				return err
			}

			client := api.NewProtonMailClient(cfg, sessionMgr)
			client.SetAuthHeader(session.AccessToken)
			mailClient := internalmail.NewClient(client)

			result, err := mailClient.BulkStar(messageIDs, true)
			if err != nil {
				return fmt.Errorf("failed to bulk star: %w", err)
			}

			fmt.Printf("Starred %d/%d messages\n", result.SuccessCount, result.Total)
			if len(result.Errors) > 0 {
				fmt.Fprintln(os.Stderr, "Errors:")
				for _, e := range result.Errors {
					fmt.Fprintf(os.Stderr, "  - %s: %s\n", e.MessageID, e.Error)
				}
			}

			return nil
		},
	}

	cmd.Flags().StringVarP(&ids, "ids", "i", "", "Comma-separated message IDs")
	cmd.Flags().StringVarP(&idsFile, "ids-file", "f", "", "File with one message ID per line")

	return cmd
}

func bulkUnstarCmd() *cobra.Command {
	var ids, idsFile string

	cmd := &cobra.Command{
		Use:   "unstar",
		Short: "Unstar multiple messages",
		Long:  `Unstar multiple messages at once. Use --ids for comma-separated IDs or --ids-file for a file with one ID per line.`,
		RunE: func(cmd *cobra.Command, args []string) error {
			messageIDs := collectMessageIDs(ids, idsFile)
			if len(messageIDs) == 0 {
				return fmt.Errorf("no message IDs provided")
			}

			cfgMgr := config.NewConfigManager()
			cfg, err := cfgMgr.Load()
			if err != nil {
				return fmt.Errorf("failed to load config: %w", err)
			}

			session, sessionMgr, err := checkAuthenticatedWithManager()
			if err != nil {
				return err
			}

			client := api.NewProtonMailClient(cfg, sessionMgr)
			client.SetAuthHeader(session.AccessToken)
			mailClient := internalmail.NewClient(client)

			result, err := mailClient.BulkStar(messageIDs, false)
			if err != nil {
				return fmt.Errorf("failed to bulk unstar: %w", err)
			}

			fmt.Printf("Unstarred %d/%d messages\n", result.SuccessCount, result.Total)
			if len(result.Errors) > 0 {
				fmt.Fprintln(os.Stderr, "Errors:")
				for _, e := range result.Errors {
					fmt.Fprintf(os.Stderr, "  - %s: %s\n", e.MessageID, e.Error)
				}
			}

			return nil
		},
	}

	cmd.Flags().StringVarP(&ids, "ids", "i", "", "Comma-separated message IDs")
	cmd.Flags().StringVarP(&idsFile, "ids-file", "f", "", "File with one message ID per line")

	return cmd
}

func bulkMarkReadCmd() *cobra.Command {
	var ids, idsFile string

	cmd := &cobra.Command{
		Use:   "mark-read",
		Short: "Mark multiple messages as read",
		Long:  `Mark multiple messages as read at once. Use --ids for comma-separated IDs or --ids-file for a file with one ID per line.`,
		RunE: func(cmd *cobra.Command, args []string) error {
			messageIDs := collectMessageIDs(ids, idsFile)
			if len(messageIDs) == 0 {
				return fmt.Errorf("no message IDs provided")
			}

			cfgMgr := config.NewConfigManager()
			cfg, err := cfgMgr.Load()
			if err != nil {
				return fmt.Errorf("failed to load config: %w", err)
			}

			session, sessionMgr, err := checkAuthenticatedWithManager()
			if err != nil {
				return err
			}

			client := api.NewProtonMailClient(cfg, sessionMgr)
			client.SetAuthHeader(session.AccessToken)
			mailClient := internalmail.NewClient(client)

			result, err := mailClient.BulkMarkRead(messageIDs, true)
			if err != nil {
				return fmt.Errorf("failed to bulk mark read: %w", err)
			}

			fmt.Printf("Marked %d/%d messages as read\n", result.SuccessCount, result.Total)
			if len(result.Errors) > 0 {
				fmt.Fprintln(os.Stderr, "Errors:")
				for _, e := range result.Errors {
					fmt.Fprintf(os.Stderr, "  - %s: %s\n", e.MessageID, e.Error)
				}
			}

			return nil
		},
	}

	cmd.Flags().StringVarP(&ids, "ids", "i", "", "Comma-separated message IDs")
	cmd.Flags().StringVarP(&idsFile, "ids-file", "f", "", "File with one message ID per line")

	return cmd
}

func bulkMarkUnreadCmd() *cobra.Command {
	var ids, idsFile string

	cmd := &cobra.Command{
		Use:   "mark-unread",
		Short: "Mark multiple messages as unread",
		Long:  `Mark multiple messages as unread at once. Use --ids for comma-separated IDs or --ids-file for a file with one ID per line.`,
		RunE: func(cmd *cobra.Command, args []string) error {
			messageIDs := collectMessageIDs(ids, idsFile)
			if len(messageIDs) == 0 {
				return fmt.Errorf("no message IDs provided")
			}

			cfgMgr := config.NewConfigManager()
			cfg, err := cfgMgr.Load()
			if err != nil {
				return fmt.Errorf("failed to load config: %w", err)
			}

			session, sessionMgr, err := checkAuthenticatedWithManager()
			if err != nil {
				return err
			}

			client := api.NewProtonMailClient(cfg, sessionMgr)
			client.SetAuthHeader(session.AccessToken)
			mailClient := internalmail.NewClient(client)

			result, err := mailClient.BulkMarkRead(messageIDs, false)
			if err != nil {
				return fmt.Errorf("failed to bulk mark unread: %w", err)
			}

			fmt.Printf("Marked %d/%d messages as unread\n", result.SuccessCount, result.Total)
			if len(result.Errors) > 0 {
				fmt.Fprintln(os.Stderr, "Errors:")
				for _, e := range result.Errors {
					fmt.Fprintf(os.Stderr, "  - %s: %s\n", e.MessageID, e.Error)
				}
			}

			return nil
		},
	}

	cmd.Flags().StringVarP(&ids, "ids", "i", "", "Comma-separated message IDs")
	cmd.Flags().StringVarP(&idsFile, "ids-file", "f", "", "File with one message ID per line")

	return cmd
}

func collectMessageIDs(ids, idsFile string) []string {
	var messageIDs []string

	if idsFile != "" {
		data, err := os.ReadFile(idsFile)
		if err != nil {
			return messageIDs
		}
		lines := strings.Split(string(data), "\n")
		for _, line := range lines {
			line = strings.TrimSpace(line)
			if line == "" || strings.HasPrefix(line, "#") {
				continue
			}
			messageIDs = append(messageIDs, line)
		}
	}

	if ids != "" {
		for _, id := range strings.Split(ids, ",") {
			id = strings.TrimSpace(id)
			if id != "" {
				messageIDs = append(messageIDs, id)
			}
		}
	}

	return messageIDs
}