"use client";

import { useState } from 'react';
import { useTranslations } from 'next-intl';
import { useSettingsStore } from '@/stores/settings-store';
import type { ArchiveMode, HoverAction } from '@/stores/settings-store';
import { ALL_HOVER_ACTIONS } from '@/stores/settings-store';
import { useAuthStore } from '@/stores/auth-store';
import { useEmailStore } from '@/stores/email-store';
import { cn } from '@/lib/utils';
import { SettingsSection, SettingItem, Select, ToggleSwitch } from './settings-section';
import { TrustedSendersModal } from '@/components/trusted-senders-modal';
import { ChevronRight, AlertTriangle, FolderSync, Loader2 } from 'lucide-react';

export function EmailSettings() {
  const t = useTranslations('settings.email_behavior');
  const [showTrustedModal, setShowTrustedModal] = useState(false);
  const [isReorganizing, setIsReorganizing] = useState(false);
  const [reorganizeResult, setReorganizeResult] = useState<string | null>(null);

  const {
    markAsReadDelay,
    deleteAction,
    permanentlyDeleteJunk,
    showPreview,
    emailsPerPage,
    externalContentPolicy,
    mailAttachmentAction,
    attachmentPosition,
    emailAlwaysLightMode,
    archiveMode,
    hoverActions,
    trustedSenders,
    updateSetting,
  } = useSettingsStore();

  // Get count label for trusted senders button
  const getTrustedSendersCount = () => {
    const count = trustedSenders.length;
    if (count === 0) return t('trusted_senders.count_zero');
    if (count === 1) return t('trusted_senders.count_one');
    return t('trusted_senders.count_other', { count });
  };

  const handleReorganizeArchive = async () => {
    const { client } = useAuthStore.getState();
    const { mailboxes, fetchMailboxes } = useEmailStore.getState();
    if (!client) return;

    const archiveMailbox = mailboxes.find(m => m.role === 'archive' || m.name.toLowerCase() === 'archive');
    if (!archiveMailbox) return;

    setIsReorganizing(true);
    setReorganizeResult(null);

    try {
      const archiveId = archiveMailbox.originalId || archiveMailbox.id;

      // Fetch all emails in the root archive mailbox
      const emails = await client.getEmailsInMailbox(archiveId);
      let movedCount = 0;

      for (const email of emails) {
        const emailDate = new Date(email.receivedAt);
        const year = emailDate.getFullYear().toString();
        const month = (emailDate.getMonth() + 1).toString().padStart(2, '0');

        // Re-read mailboxes from store each iteration in case new ones were created
        let currentMailboxes = useEmailStore.getState().mailboxes;

        // Find or create year subfolder
        let yearMailbox = currentMailboxes.find(
          m => m.name === year && m.parentId === archiveId
        );
        if (!yearMailbox) {
          yearMailbox = await client.createMailbox(year, archiveId);
          await fetchMailboxes(client);
          currentMailboxes = useEmailStore.getState().mailboxes;
        }

        if (archiveMode === 'year') {
          await client.moveEmail(email.id, yearMailbox.id);
          movedCount++;
        } else {
          // month mode
          const yearId = yearMailbox.originalId || yearMailbox.id;
          let monthMailbox = currentMailboxes.find(
            m => m.name === month && m.parentId === yearId
          );
          if (!monthMailbox) {
            monthMailbox = await client.createMailbox(month, yearId);
            await fetchMailboxes(client);
          }
          await client.moveEmail(email.id, monthMailbox.id);
          movedCount++;
        }
      }

      setReorganizeResult(t('archive_mode.reorganize_success', { count: movedCount }));
    } catch (error) {
      console.error('Failed to reorganize archive:', error);
      setReorganizeResult(t('archive_mode.reorganize_error'));
    } finally {
      setIsReorganizing(false);
    }
  };

  return (
    <SettingsSection title={t('title')} description={t('description')}>
      {/* Mark as Read */}
      <SettingItem label={t('mark_read.label')} description={t('mark_read.description')}>
        <Select
          value={markAsReadDelay.toString()}
          onChange={(value) => updateSetting('markAsReadDelay', parseInt(value))}
          options={[
            { value: '0', label: t('mark_read.instant') },
            { value: '3000', label: t('mark_read.delay_3s') },
            { value: '5000', label: t('mark_read.delay_5s') },
            { value: '-1', label: t('mark_read.never') },
          ]}
        />
      </SettingItem>

      {/* Delete Action */}
      <SettingItem label={t('delete_action.label')} description={t('delete_action.description')}>
        <div className="flex flex-col gap-2">
          <Select
            value={deleteAction}
            onChange={(value) => updateSetting('deleteAction', value as 'trash' | 'permanent')}
            options={[
              { value: 'trash', label: t('delete_action.trash') },
              { value: 'permanent', label: t('delete_action.permanent') },
            ]}
          />
          {deleteAction === 'permanent' && (
            <div className="flex items-start gap-2 p-2 rounded-md bg-destructive/10 text-destructive text-xs">
              <AlertTriangle className="w-4 h-4 shrink-0 mt-0.5" />
              <span>{t('delete_action.warning')}</span>
            </div>
          )}
        </div>
      </SettingItem>

      {/* Archive Mode */}
      <SettingItem label={t('archive_mode.label')} description={t('archive_mode.description')}>
        <div className="flex flex-col gap-2">
          <Select
            value={archiveMode}
            onChange={(value) => updateSetting('archiveMode', value as ArchiveMode)}
            options={[
              { value: 'single', label: t('archive_mode.single') },
              { value: 'year', label: t('archive_mode.year') },
              { value: 'month', label: t('archive_mode.month') },
            ]}
          />
          {archiveMode !== 'single' && (
            <div className="flex flex-col gap-2">
              <button
                onClick={handleReorganizeArchive}
                disabled={isReorganizing}
                className="flex items-center gap-2 px-3 py-1.5 bg-muted hover:bg-accent rounded-md transition-colors text-sm disabled:opacity-50"
              >
                {isReorganizing ? (
                  <Loader2 className="w-4 h-4 animate-spin" />
                ) : (
                  <FolderSync className="w-4 h-4" />
                )}
                <span>{t('archive_mode.reorganize')}</span>
              </button>
              {reorganizeResult && (
                <p className="text-xs text-muted-foreground">{reorganizeResult}</p>
              )}
            </div>
          )}
        </div>
      </SettingItem>

      {/* Permanently Delete Junk */}
      <SettingItem label={t('permanently_delete_junk.label')} description={t('permanently_delete_junk.description')}>
        <ToggleSwitch
          checked={permanentlyDeleteJunk}
          onChange={(checked) => updateSetting('permanentlyDeleteJunk', checked)}
        />
      </SettingItem>

      {/* Show Preview */}
      <SettingItem label={t('show_preview.label')} description={t('show_preview.description')}>
        <ToggleSwitch checked={showPreview} onChange={(checked) => updateSetting('showPreview', checked)} />
      </SettingItem>

      {/* Quick Hover Actions */}
      <div className="py-3 border-b border-border space-y-3">
        <div>
          <label className="text-sm font-medium text-foreground">{t('hover_actions.label')}</label>
          <p className="text-xs text-muted-foreground mt-1">{t('hover_actions.description')}</p>
        </div>
        <div className="flex flex-wrap gap-2">
          {ALL_HOVER_ACTIONS.map((action) => {
            const isEnabled = hoverActions.includes(action.id);
            return (
              <button
                key={action.id}
                type="button"
                onClick={() => {
                  const newActions = isEnabled
                    ? hoverActions.filter((a: HoverAction) => a !== action.id)
                    : [...hoverActions, action.id];
                  updateSetting('hoverActions', newActions);
                }}
                className={cn(
                  'px-3 py-1.5 text-xs rounded-md transition-colors duration-150',
                  isEnabled
                    ? 'bg-primary text-primary-foreground font-medium'
                    : 'bg-muted hover:bg-accent text-foreground'
                )}
              >
                {t(`hover_actions.${action.labelKey}`)}
              </button>
            );
          })}
        </div>
      </div>

      <SettingItem label={t('attachment_click_action.label')} description={t('attachment_click_action.description')}>
        <Select
          value={mailAttachmentAction}
          onChange={(value) => updateSetting('mailAttachmentAction', value as 'preview' | 'download')}
          options={[
            { value: 'preview', label: t('attachment_click_action.preview') },
            { value: 'download', label: t('attachment_click_action.download') },
          ]}
        />
      </SettingItem>

      <SettingItem label={t('attachment_position.label')} description={t('attachment_position.description')}>
        <Select
          value={attachmentPosition}
          onChange={(value) => updateSetting('attachmentPosition', value as 'beside-sender' | 'below-header')}
          options={[
            { value: 'beside-sender', label: t('attachment_position.beside-sender') },
            { value: 'below-header', label: t('attachment_position.below-header') },
          ]}
        />
      </SettingItem>

      {/* Emails Per Page */}
      <SettingItem label={t('emails_per_page.label')} description={t('emails_per_page.description')}>
        <Select
          value={emailsPerPage.toString()}
          onChange={(value) => updateSetting('emailsPerPage', parseInt(value))}
          options={[
            { value: '25', label: t('emails_per_page.25') },
            { value: '50', label: t('emails_per_page.50') },
            { value: '100', label: t('emails_per_page.100') },
          ]}
        />
      </SettingItem>

      {/* Always Light Mode for Emails */}
      <SettingItem label={t('always_light_mode.label')} description={t('always_light_mode.description')}>
        <ToggleSwitch
          checked={emailAlwaysLightMode}
          onChange={(checked) => updateSetting('emailAlwaysLightMode', checked)}
        />
      </SettingItem>

      {/* External Content */}
      <SettingItem label={t('external_content.label')} description={t('external_content.description')}>
        <Select
          value={externalContentPolicy}
          onChange={(value) =>
            updateSetting('externalContentPolicy', value as 'ask' | 'block' | 'allow')
          }
          options={[
            { value: 'ask', label: t('external_content.ask') },
            { value: 'block', label: t('external_content.block') },
            { value: 'allow', label: t('external_content.allow') },
          ]}
        />
      </SettingItem>

      {/* Trusted Senders */}
      <SettingItem label={t('trusted_senders.label')} description={t('trusted_senders.description')}>
        <button
          onClick={() => setShowTrustedModal(true)}
          className="flex items-center gap-2 px-3 py-1.5 bg-muted hover:bg-accent rounded-md transition-colors"
        >
          <span className="text-sm text-foreground">{getTrustedSendersCount()}</span>
          <ChevronRight className="w-4 h-4 text-muted-foreground" />
        </button>
      </SettingItem>

      {/* Trusted Senders Modal */}
      <TrustedSendersModal
        isOpen={showTrustedModal}
        onClose={() => setShowTrustedModal(false)}
      />
    </SettingsSection>
  );
}