package cmd

import (
	"fmt"
	"os"
	"strconv"

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

func mailDraftCmd() *cobra.Command {
	cmd := &cobra.Command{
		Use:   "draft",
		Short: "Manage draft messages",
		Long:  `Save, list, edit, and send draft messages.`,
	}

	cmd.AddCommand(draftSaveCmd())
	cmd.AddCommand(draftListCmd())
	cmd.AddCommand(draftEditCmd())
	cmd.AddCommand(draftSendCmd())

	return cmd
}

func draftSaveCmd() *cobra.Command {
	var to, cc, bcc, subject, bodyFile, body string

	cmd := &cobra.Command{
		Use:   "save",
		Short: "Save a draft message",
		Long:  `Save a message as a draft in ProtonMail.`,
		RunE: func(cmd *cobra.Command, args []string) error {
			if to == "" {
				return fmt.Errorf("recipient is required (--to)")
			}

			msgBody := body
			if bodyFile != "" {
				data, err := os.ReadFile(bodyFile)
				if err != nil {
					return fmt.Errorf("failed to read body file: %w", err)
				}
				msgBody = string(data)
			}

			recipients := parseRecipients(to)
			var ccRecipients []internalmail.Recipient
			if cc != "" {
				ccRecipients = parseRecipients(cc)
			}

			var bccRecipients []internalmail.Recipient
			if bcc != "" {
				bccRecipients = parseRecipients(bcc)
			}

			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 fmt.Errorf("not authenticated: %w", err)
			}

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

			draft := internalmail.Draft{
				To:        recipients,
				CC:        ccRecipients,
				BCC:       bccRecipients,
				Subject:   subject,
				Body:      msgBody,
			}

			messageID, err := mailClient.SaveDraft(draft, session.MailPassphrase)
			if err != nil {
				return fmt.Errorf("failed to save draft: %w", err)
			}

			fmt.Printf("Draft saved with ID: %s\n", messageID)
			return nil
		},
	}

	cmd.Flags().StringVarP(&to, "to", "t", "", "Recipient addresses (comma-separated)")
	cmd.Flags().StringVarP(&cc, "cc", "c", "", "CC addresses (comma-separated)")
	cmd.Flags().StringVarP(&bcc, "bcc", "b", "", "BCC addresses (comma-separated)")
	cmd.Flags().StringVarP(&subject, "subject", "s", "", "Draft subject")
	cmd.Flags().StringVarP(&bodyFile, "body-file", "f", "", "File containing draft body")
	cmd.Flags().StringVar(&body, "body", "", "Inline draft body")

	return cmd
}

func draftListCmd() *cobra.Command {
	var page, pageSize string

	cmd := &cobra.Command{
		Use:   "list",
		Short: "List draft messages",
		Long:  `List all draft messages in ProtonMail.`,
		RunE: func(cmd *cobra.Command, args []string) error {
			pageVal, err := strconv.Atoi(page)
			if err != nil || pageVal < 1 {
				pageVal = 1
			}

			pageSizeVal, err := strconv.Atoi(pageSize)
			if err != nil || pageSizeVal < 1 {
				pageSizeVal = 20
			}

			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 fmt.Errorf("not authenticated: %w", err)
			}

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

			result, err := mailClient.ListDrafts(pageVal, pageSizeVal, session.MailPassphrase)
			if err != nil {
				return fmt.Errorf("failed to list drafts: %w", err)
			}

			return printMessages(result.Messages)
		},
	}

	cmd.Flags().StringVar(&page, "page", "1", "Page number")
	cmd.Flags().StringVar(&pageSize, "page-size", "20", "Drafts per page (max 100)")

	return cmd
}

func draftEditCmd() *cobra.Command {
	var to, cc, bcc, subject, bodyFile, body string

	cmd := &cobra.Command{
		Use:   "edit <draft-id>",
		Short: "Edit a draft message",
		Long:  `Edit an existing draft message in ProtonMail.`,
		Args:  cobra.ExactArgs(1),
		RunE: func(cmd *cobra.Command, args []string) error {
			messageID := args[0]

			var recipients []internalmail.Recipient
			if to != "" {
				recipients = parseRecipients(to)
			}

			var ccRecipients []internalmail.Recipient
			if cc != "" {
				ccRecipients = parseRecipients(cc)
			}

			var bccRecipients []internalmail.Recipient
			if bcc != "" {
				bccRecipients = parseRecipients(bcc)
			}

			msgBody := body
			if bodyFile != "" {
				data, err := os.ReadFile(bodyFile)
				if err != nil {
					return fmt.Errorf("failed to read body file: %w", err)
				}
				msgBody = string(data)
			}

			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 fmt.Errorf("not authenticated: %w", err)
			}

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

			draft := internalmail.Draft{
				To:      recipients,
				CC:      ccRecipients,
				BCC:     bccRecipients,
				Subject: subject,
				Body:    msgBody,
			}

			if err := mailClient.UpdateDraft(messageID, draft, session.MailPassphrase); err != nil {
				return fmt.Errorf("failed to update draft: %w", err)
			}

			fmt.Println("Draft updated successfully")
			return nil
		},
	}

	cmd.Flags().StringVarP(&to, "to", "t", "", "New recipient addresses (comma-separated)")
	cmd.Flags().StringVarP(&cc, "cc", "c", "", "New CC addresses (comma-separated)")
	cmd.Flags().StringVarP(&bcc, "bcc", "b", "", "New BCC addresses (comma-separated)")
	cmd.Flags().StringVarP(&subject, "subject", "s", "", "New draft subject")
	cmd.Flags().StringVarP(&bodyFile, "body-file", "f", "", "File containing new draft body")
	cmd.Flags().StringVar(&body, "body", "", "New inline draft body")

	return cmd
}

func draftSendCmd() *cobra.Command {
	cmd := &cobra.Command{
		Use:   "send <draft-id>",
		Short: "Send a draft message",
		Long:  `Send an existing draft message from ProtonMail.`,
		Args:  cobra.ExactArgs(1),
		RunE: func(cmd *cobra.Command, args []string) error {
			messageID := args[0]

			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 fmt.Errorf("not authenticated: %w", err)
			}

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

			if err := mailClient.SendDraft(messageID, session.MailPassphrase); err != nil {
				return fmt.Errorf("failed to send draft: %w", err)
			}

			fmt.Println("Draft sent successfully")
			return nil
		},
	}

	return cmd
}