import { useState } from 'react'
import { useTranslation } from 'react-i18next'
import type { ThemeId, Language, PomodoroDuration } from '@shared/types'
import { useSettingsStore } from '@renderer/stores/useSettingsStore'
import { ShortcutEditor } from '@renderer/components/settings/ShortcutEditor'
import { AiSettingsPage } from '@renderer/components/settings/AiSettingsPage'

const THEMES: { id: ThemeId; key: string }[] = [
  { id: 'default', key: 'theme.default' },
  { id: 'bamboo', key: 'theme.bamboo' },
  { id: 'moonlit', key: 'theme.moonlit' },
  { id: 'ricepaper', key: 'theme.ricepaper' },
  { id: 'mist', key: 'theme.mist' },
  { id: 'teagarden', key: 'theme.teagarden' },
  { id: 'twilight', key: 'theme.twilight' }
]

export function SettingsPage(): React.JSX.Element {
  const { t } = useTranslation()
  const settings = useSettingsStore()
  const [section, setSection] = useState<'general' | 'ai' | 'shortcuts' | 'about'>('general')

  return (
    <div id="settings-page">
      <div className="settings-sidebar">
        <div
          className={`settings-nav-item ${section === 'general' ? 'active' : ''}`}
          onClick={() => setSection('general')}
          role="button"
          tabIndex={0}
        >
          {t('settings.general')}
        </div>
        <div
          className={`settings-nav-item ${section === 'ai' ? 'active' : ''}`}
          onClick={() => setSection('ai')}
          role="button"
          tabIndex={0}
          data-testid="settings-nav-ai"
        >
          {t('settings.ai')}
        </div>
        <div
          className={`settings-nav-item ${section === 'shortcuts' ? 'active' : ''}`}
          onClick={() => setSection('shortcuts')}
          role="button"
          tabIndex={0}
        >
          {t('settings.shortcuts')}
        </div>
        <div
          className={`settings-nav-item ${section === 'about' ? 'active' : ''}`}
          onClick={() => setSection('about')}
          role="button"
          tabIndex={0}
        >
          {t('settings.about')}
        </div>
      </div>
      <div className="settings-content">
        <h2 className="settings-heading">{t('settings.title')}</h2>
        {section === 'general' && (
          <>
            <div className="setting-item">
              <span>{t('settings.penName')}</span>
              <input
                data-testid="settings-pen-name"
                className="form-control form-control--narrow"
                value={settings.penName}
                onChange={(e) => void settings.update({ penName: e.target.value })}
              />
            </div>
            <div className="setting-item">
              <span>{t('settings.theme')}</span>
              <select
                data-testid="settings-theme"
                className="form-control"
                value={settings.theme}
                onChange={(e) => void settings.update({ theme: e.target.value as ThemeId })}
              >
                {THEMES.map((th) => (
                  <option key={th.id} value={th.id}>
                    {t(th.key)}
                  </option>
                ))}
              </select>
            </div>
            <div className="setting-item">
              <span>{t('settings.language')}</span>
              <select
                data-testid="settings-language"
                className="form-control"
                value={settings.language}
                onChange={(e) => void settings.update({ language: e.target.value as Language })}
              >
                <option value="zh-CN">简体中文</option>
                <option value="en">English</option>
              </select>
            </div>
            <div className="setting-item">
              <span>{t('settings.updateSchedule')}</span>
              <select
                data-testid="settings-update-schedule"
                className="form-control"
                value={settings.updateSchedule}
                onChange={(e) =>
                  void settings.update({
                    updateSchedule: e.target.value as typeof settings.updateSchedule
                  })
                }
              >
                <option value="none">{t('settings.updateSchedule.none')}</option>
                <option value="daily">{t('settings.updateSchedule.daily')}</option>
                <option value="alternate">{t('settings.updateSchedule.alternate')}</option>
                <option value="weekly">{t('settings.updateSchedule.weekly')}</option>
              </select>
            </div>
            <div className="setting-item">
              <span>{t('settings.stockBufferThreshold')}</span>
              <input
                type="number"
                min={1}
                max={20}
                data-testid="settings-stock-threshold"
                className="form-control form-control--narrow"
                value={settings.stockBufferThreshold}
                onChange={(e) =>
                  void settings.update({
                    stockBufferThreshold: Math.min(20, Math.max(1, Number(e.target.value) || 3))
                  })
                }
              />
            </div>
            <div className="setting-item">
              <span>{t('settings.dailyWordGoal')}</span>
              <input
                type="number"
                min={0}
                data-testid="settings-daily-word-goal"
                className="form-control form-control--narrow"
                value={settings.dailyWordGoal}
                onChange={(e) =>
                  void settings.update({
                    dailyWordGoal: Math.max(0, Number(e.target.value) || 0)
                  })
                }
              />
            </div>
            <div className="setting-item">
              <label style={{ display: 'flex', alignItems: 'center', gap: 8 }}>
                <input
                  type="checkbox"
                  data-testid="settings-knowledge-auto-extract"
                  checked={settings.knowledgeAutoExtract !== false}
                  onChange={(e) =>
                    void settings.update({ knowledgeAutoExtract: e.target.checked })
                  }
                />
                {t('settings.knowledgeAutoExtract')}
              </label>
            </div>
            <div className="setting-item">
              <span>{t('settings.pomodoroDuration')}</span>
              <select
                data-testid="settings-pomodoro-duration"
                className="form-control form-control--narrow"
                value={settings.pomodoroDurationMinutes ?? 25}
                onChange={(e) =>
                  void settings.update({
                    pomodoroDurationMinutes: Number(e.target.value) as PomodoroDuration
                  })
                }
              >
                <option value={15}>15</option>
                <option value={25}>25</option>
                <option value={45}>45</option>
              </select>
            </div>
            <div className="setting-item">
              <label style={{ display: 'flex', alignItems: 'center', gap: 8 }}>
                <input
                  type="checkbox"
                  data-testid="settings-system-notifications"
                  checked={settings.enableSystemNotifications === true}
                  onChange={(e) =>
                    void settings.update({ enableSystemNotifications: e.target.checked })
                  }
                />
                {t('settings.systemNotifications')}
              </label>
            </div>
            <div className="setting-item">
              <label style={{ display: 'flex', alignItems: 'center', gap: 8 }}>
                <input
                  type="checkbox"
                  data-testid="settings-goal-notifications"
                  checked={settings.enableGoalNotifications !== false}
                  onChange={(e) =>
                    void settings.update({ enableGoalNotifications: e.target.checked })
                  }
                />
                {t('settings.goalNotifications')}
              </label>
            </div>
            <div className="setting-item">
              <span>{t('settings.extractThreshold')}</span>
              <input
                type="number"
                min={0}
                max={1}
                step={0.05}
                data-testid="settings-extract-threshold"
                className="form-control form-control--narrow"
                value={settings.knowledgeExtractConfidenceThreshold ?? 0.8}
                onChange={(e) =>
                  void settings.update({
                    knowledgeExtractConfidenceThreshold: Math.min(
                      1,
                      Math.max(0, Number(e.target.value) || 0.8)
                    )
                  })
                }
              />
            </div>
          </>
        )}
        {section === 'ai' && <AiSettingsPage />}
        {section === 'shortcuts' && <ShortcutEditor />}
        {section === 'about' && (
          <p style={{ color: 'var(--text-secondary)', lineHeight: 1.8 }}>
            {t('app.name')} v1.0.0
            <br />
            {t('app.tagline')}
          </p>
        )}
      </div>
    </div>
  )
}