import { Ionicons } from '@expo/vector-icons';
import { useRouter } from 'expo-router';
import { useEffect, useState } from 'react';
import {
  ActivityIndicator,
  Pressable,
  ScrollView,
  StyleSheet,
  Switch,
  Text,
  TextInput,
  View,
} from 'react-native';
import { SafeAreaView } from 'react-native-safe-area-context';
import { useResumeExport } from '../../src/hooks';
import { colors } from '../../src/theme';
import type { ResumeExportFormat, ResumeExportSettings, ResumeTemplate } from '../../src/types';

const FORMATS: { key: ResumeExportFormat; label: string; icon: keyof typeof Ionicons.glyphMap }[] = [
  { key: 'pdf', label: 'PDF', icon: 'document-outline' },
  { key: 'word', label: 'Word', icon: 'document-text-outline' },
  { key: 'image', label: '图片', icon: 'image-outline' },
];

const TEMPLATES: ResumeTemplate[] = [
  { id: 'classic', name: '简约经典', color: 'primary' },
  { id: 'creative', name: '创意设计', color: 'info' },
  { id: 'tech', name: '技术专业', color: 'success' },
];

const TEMPLATE_COLORS: Record<string, string> = {
  primary: colors.primary,
  info: colors.info,
  success: colors.success,
};

/* ===================== 子组件：顶部导航 ===================== */

function Header({ onBack, onSave }: { onBack: () => void; onSave: () => void }) {
  return (
    <View style={styles.header}>
      <Pressable style={styles.headerBtn} onPress={onBack} hitSlop={8}>
        <Ionicons name="chevron-back" size={24} color={colors.textPrimary} />
      </Pressable>
      <Text style={styles.headerTitle}>导出简历</Text>
      <Pressable style={styles.headerBtn} onPress={onSave} hitSlop={8}>
        <Text style={styles.headerSave}>保存</Text>
      </Pressable>
    </View>
  );
}

/* ===================== 子组件：预览区 ===================== */

function PreviewCard() {
  return (
    <View style={styles.previewCard}>
      <View style={styles.previewThumb}>
        <Ionicons name="document-text-outline" size={48} color={colors.primary} />
      </View>
      <Text style={styles.previewText}>实时预览你的简历效果</Text>
      <Pressable style={styles.previewLink}>
        <Text style={styles.previewLinkText}>打开预览</Text>
        <Ionicons name="chevron-forward" size={14} color={colors.primary} />
      </Pressable>
    </View>
  );
}

/* ===================== 子组件：格式选择 ===================== */

function FormatSelect({
  value,
  onChange,
}: {
  value: ResumeExportFormat;
  onChange: (v: ResumeExportFormat) => void;
}) {
  return (
    <View style={styles.section}>
      <Text style={styles.sectionTitle}>选择导出格式</Text>
      <View style={styles.formatRow}>
        {FORMATS.map((f) => {
          const selected = value === f.key;
          return (
            <Pressable
              key={f.key}
              style={[styles.formatCard, selected && styles.formatCardActive]}
              onPress={() => onChange(f.key)}
            >
              <Ionicons name={f.icon} size={28} color={selected ? colors.primary : colors.textHint} />
              <Text style={[styles.formatLabel, selected && styles.formatLabelActive]}>{f.label}</Text>
              <Text style={styles.formatHint}>高清 · 格式友好</Text>
              {selected && (
                <View style={styles.formatCheck}>
                  <Ionicons name="checkmark-circle" size={18} color={colors.primary} />
                </View>
              )}
            </Pressable>
          );
        })}
      </View>
    </View>
  );
}

/* ===================== 子组件：模板选择 ===================== */

function TemplateSelect({
  value,
  onChange,
}: {
  value: string;
  onChange: (v: string) => void;
}) {
  return (
    <View style={styles.section}>
      <View style={styles.sectionHeader}>
        <Text style={styles.sectionTitle}>选择简历模板</Text>
        <Pressable>
          <Text style={styles.moreLink}>全部模板 &gt;</Text>
        </Pressable>
      </View>
      <View style={styles.templateRow}>
        {TEMPLATES.map((t) => {
          const selected = value === t.id;
          return (
            <Pressable
              key={t.id}
              style={[styles.templateCard, selected && styles.templateCardActive]}
              onPress={() => onChange(t.id)}
            >
              <View
                style={[
                  styles.templateThumb,
                  { backgroundColor: TEMPLATE_COLORS[t.color] ?? colors.primary },
                ]}
              >
                <View style={styles.templateLines}>
                  <View style={styles.templateLine} />
                  <View style={styles.templateLineShort} />
                </View>
              </View>
              <Text style={[styles.templateName, selected && styles.templateNameActive]}>
                {t.name}
              </Text>
              {selected && <Ionicons name="checkmark-circle" size={18} color={colors.primary} />}
            </Pressable>
          );
        })}
      </View>
    </View>
  );
}

/* ===================== 子组件：开关行 ===================== */

function ToggleRow({
  label,
  desc,
  value,
  onChange,
}: {
  label: string;
  desc?: string;
  value: boolean;
  onChange: (v: boolean) => void;
}) {
  return (
    <View style={styles.toggleRow}>
      <View style={styles.toggleText}>
        <Text style={styles.toggleLabel}>{label}</Text>
        {desc && <Text style={styles.toggleDesc}>{desc}</Text>}
      </View>
      <Switch
        value={value}
        onValueChange={onChange}
        trackColor={{ false: colors.border, true: colors.primaryBorder }}
        thumbColor={value ? colors.primary : colors.white}
      />
    </View>
  );
}

/* ===================== 子组件：输入行 ===================== */

function InputRow({
  label,
  value,
  onChange,
  placeholder,
}: {
  label: string;
  value: string;
  onChange: (v: string) => void;
  placeholder?: string;
}) {
  return (
    <View style={styles.inputRow}>
      <Text style={styles.inputLabel}>{label}</Text>
      <TextInput
        style={styles.input}
        value={value}
        onChangeText={onChange}
        placeholder={placeholder}
        placeholderTextColor={colors.textHint}
      />
    </View>
  );
}

/* ===================== 子组件：四态 ===================== */

function Loading() {
  return (
    <View style={styles.center}>
      <ActivityIndicator size="large" color={colors.primary} />
      <Text style={styles.tip}>正在加载设置…</Text>
    </View>
  );
}

function ErrorState({ onRetry }: { onRetry: () => void }) {
  return (
    <View style={styles.center}>
      <Ionicons name="download-outline" size={40} color={colors.textHint} />
      <Text style={styles.tip}>设置加载失败</Text>
      <Pressable style={styles.retryBtn} onPress={onRetry} hitSlop={6}>
        <Text style={styles.retryText}>点击重试</Text>
      </Pressable>
    </View>
  );
}

/* ===================== 页面 ===================== */

export default function ResumeExportScreen() {
  const router = useRouter();
  const { settings, loading, error, refresh, save, exportFile, exporting } = useResumeExport();
  const [localSettings, setLocalSettings] = useState<ResumeExportSettings | null>(null);

  useEffect(() => {
    if (settings && !localSettings) {
      setLocalSettings(settings);
    }
  }, [settings, localSettings]);

  const update = <K extends keyof ResumeExportSettings>(key: K, value: ResumeExportSettings[K]) => {
    setLocalSettings((prev) => (prev ? { ...prev, [key]: value } : prev));
  };

  const handleSave = async () => {
    if (localSettings) {
      await save(localSettings);
    }
  };

  const handleExport = async () => {
    if (!localSettings) return;
    await handleSave();
    const url = await exportFile(localSettings);
    console.log('[Resume Export] url:', url);
  };

  if (loading) {
    return (
      <SafeAreaView style={styles.container} edges={['top']}>
        <Header onBack={() => router.back()} onSave={() => {}} />
        <Loading />
      </SafeAreaView>
    );
  }

  if (error || !localSettings) {
    return (
      <SafeAreaView style={styles.container} edges={['top']}>
        <Header onBack={() => router.back()} onSave={() => {}} />
        <ErrorState onRetry={refresh} />
      </SafeAreaView>
    );
  }

  return (
    <SafeAreaView style={styles.container} edges={['top']}>
      <Header onBack={() => router.back()} onSave={handleSave} />
      <ScrollView contentContainerStyle={styles.body} showsVerticalScrollIndicator={false}>
        <PreviewCard />

        <FormatSelect value={localSettings.format} onChange={(v) => update('format', v)} />

        <TemplateSelect value={localSettings.templateId} onChange={(v) => update('templateId', v)} />

        <View style={styles.section}>
          <Text style={styles.sectionTitle}>导出设置</Text>
          <View style={styles.card}>
            <ToggleRow
              label="隐藏联系方式"
              desc="保护隐私，不展示手机号/邮箱"
              value={localSettings.hideContact}
              onChange={(v) => update('hideContact', v)}
            />
            <ToggleRow
              label="导出密码"
              desc="为导出的简历设置查看密码"
              value={localSettings.exportPassword}
              onChange={(v) => update('exportPassword', v)}
            />
            <InputRow label="纸型" value={localSettings.paperSize} onChange={() => {}} />
            <InputRow label="方向" value={localSettings.orientation === 'portrait' ? '纵向' : '横向'} onChange={() => {}} />
            <InputRow
              label="文件名"
              value={localSettings.fileName}
              onChange={(v) => update('fileName', v)}
              placeholder="请输入文件名"
            />
            <ToggleRow
              label="包含封面页"
              value={localSettings.includeCover}
              onChange={(v) => update('includeCover', v)}
            />
            <ToggleRow
              label="包含自荐信"
              value={localSettings.includeRecommendation}
              onChange={(v) => update('includeRecommendation', v)}
            />
          </View>
        </View>

        <View style={styles.section}>
          <Text style={styles.sectionTitle}>定向优化（可选）</Text>
          <View style={styles.card}>
            <Text style={styles.targetLabel}>粘贴岗位描述，AI 自动优化简历匹配度</Text>
            <TextInput
              style={styles.targetInput}
              value={localSettings.targetJobDescription ?? ''}
              onChangeText={(v) => update('targetJobDescription', v)}
              placeholder="输入岗位 JD…"
              placeholderTextColor={colors.textHint}
              multiline
              numberOfLines={4}
              textAlignVertical="top"
            />
            <Pressable style={styles.targetBtn}>
              <Ionicons name="sparkles" size={16} color={colors.white} />
              <Text style={styles.targetBtnText}>AI 智能优化</Text>
            </Pressable>
          </View>
        </View>
      </ScrollView>

      <View style={styles.footer}>
        <Pressable style={styles.shareBtn}>
          <Text style={styles.shareBtnText}>分享简历</Text>
        </Pressable>
        <Pressable
          style={[styles.exportBtn, exporting && styles.exportBtnDisabled]}
          onPress={handleExport}
          disabled={exporting}
        >
          {exporting ? (
            <ActivityIndicator size="small" color={colors.white} />
          ) : (
            <Text style={styles.exportBtnText}>立即导出</Text>
          )}
        </Pressable>
      </View>
    </SafeAreaView>
  );
}

const styles = StyleSheet.create({
  container: { flex: 1, backgroundColor: colors.pageBg },
  header: {
    flexDirection: 'row',
    alignItems: 'center',
    justifyContent: 'space-between',
    paddingHorizontal: 12,
    paddingVertical: 12,
    backgroundColor: colors.white,
  },
  headerBtn: { width: 60, justifyContent: 'center' },
  headerTitle: { fontSize: 17, fontWeight: '700', color: colors.textPrimary },
  headerSave: { fontSize: 14, color: colors.primary, textAlign: 'right' },
  body: { padding: 16, paddingBottom: 100 },
  center: { flex: 1, alignItems: 'center', justifyContent: 'center', paddingHorizontal: 40, gap: 12 },
  tip: { fontSize: 14, color: colors.textSecondary },
  retryBtn: { paddingHorizontal: 18, paddingVertical: 8, borderRadius: 16, backgroundColor: colors.primaryLight },
  retryText: { fontSize: 13, fontWeight: '600', color: colors.primaryText },
  previewCard: {
    backgroundColor: colors.white,
    borderRadius: 14,
    padding: 20,
    alignItems: 'center',
    marginBottom: 16,
    borderWidth: 1,
    borderColor: colors.borderLight,
  },
  previewThumb: {
    width: 80,
    height: 80,
    borderRadius: 40,
    backgroundColor: colors.primaryLight,
    alignItems: 'center',
    justifyContent: 'center',
    marginBottom: 10,
  },
  previewText: { fontSize: 14, color: colors.textSecondary },
  previewLink: { flexDirection: 'row', alignItems: 'center', marginTop: 8 },
  previewLinkText: { fontSize: 13, color: colors.primary, marginRight: 2 },
  section: { marginBottom: 16 },
  sectionHeader: {
    flexDirection: 'row',
    alignItems: 'center',
    justifyContent: 'space-between',
    marginBottom: 12,
  },
  sectionTitle: { fontSize: 16, fontWeight: '700', color: colors.textPrimary, marginBottom: 12 },
  moreLink: { fontSize: 13, color: colors.primary },
  formatRow: { flexDirection: 'row', gap: 10 },
  formatCard: {
    flex: 1,
    backgroundColor: colors.white,
    borderRadius: 12,
    padding: 14,
    alignItems: 'center',
    borderWidth: 1,
    borderColor: colors.borderLight,
  },
  formatCardActive: { borderColor: colors.primary, backgroundColor: colors.primaryLight },
  formatLabel: { fontSize: 13, fontWeight: '700', color: colors.textPrimary, marginTop: 8 },
  formatLabelActive: { color: colors.primaryText },
  formatHint: { fontSize: 10, color: colors.textHint, marginTop: 2 },
  formatCheck: { position: 'absolute', top: 8, right: 8 },
  templateRow: { flexDirection: 'row', gap: 10 },
  templateCard: {
    flex: 1,
    backgroundColor: colors.white,
    borderRadius: 12,
    padding: 10,
    alignItems: 'center',
    borderWidth: 1,
    borderColor: colors.borderLight,
  },
  templateCardActive: { borderColor: colors.primary },
  templateThumb: {
    width: '100%',
    height: 80,
    borderRadius: 8,
    backgroundColor: colors.primary,
    padding: 12,
    marginBottom: 8,
  },
  templateLines: { gap: 8, marginTop: 8 },
  templateLine: { height: 8, borderRadius: 4, backgroundColor: colors.white, opacity: 0.9 },
  templateLineShort: { width: '60%', height: 8, borderRadius: 4, backgroundColor: colors.white, opacity: 0.7 },
  templateName: { fontSize: 12, color: colors.textPrimary },
  templateNameActive: { color: colors.primaryText, fontWeight: '700' },
  card: {
    backgroundColor: colors.white,
    borderRadius: 14,
    padding: 16,
    borderWidth: 1,
    borderColor: colors.borderLight,
  },
  toggleRow: {
    flexDirection: 'row',
    alignItems: 'center',
    justifyContent: 'space-between',
    paddingVertical: 12,
    borderTopWidth: 1,
    borderTopColor: colors.borderLight,
  },
  toggleText: { flex: 1, marginRight: 12 },
  toggleLabel: { fontSize: 14, color: colors.textPrimary },
  toggleDesc: { fontSize: 12, color: colors.textHint, marginTop: 2 },
  inputRow: {
    flexDirection: 'row',
    alignItems: 'center',
    justifyContent: 'space-between',
    paddingVertical: 12,
    borderTopWidth: 1,
    borderTopColor: colors.borderLight,
  },
  inputLabel: { fontSize: 14, color: colors.textPrimary, width: 80 },
  input: {
    flex: 1,
    fontSize: 14,
    color: colors.textPrimary,
    textAlign: 'right',
  },
  targetLabel: { fontSize: 13, color: colors.textSecondary, marginBottom: 10 },
  targetInput: {
    height: 100,
    borderRadius: 10,
    backgroundColor: colors.pageBg,
    padding: 12,
    fontSize: 14,
    color: colors.textPrimary,
  },
  targetBtn: {
    flexDirection: 'row',
    alignItems: 'center',
    justifyContent: 'center',
    backgroundColor: colors.primaryBtn,
    borderRadius: 12,
    paddingVertical: 12,
    marginTop: 12,
  },
  targetBtnText: { fontSize: 14, fontWeight: '700', color: colors.white, marginLeft: 6 },
  footer: {
    position: 'absolute',
    left: 0,
    right: 0,
    bottom: 0,
    flexDirection: 'row',
    paddingHorizontal: 16,
    paddingVertical: 12,
    backgroundColor: colors.white,
    borderTopWidth: 1,
    borderTopColor: colors.borderLight,
  },
  shareBtn: {
    flex: 1,
    backgroundColor: colors.white,
    borderRadius: 24,
    paddingVertical: 14,
    alignItems: 'center',
    borderWidth: 1,
    borderColor: colors.border,
    marginRight: 12,
  },
  shareBtnText: { fontSize: 15, fontWeight: '700', color: colors.textPrimary },
  exportBtn: {
    flex: 2,
    backgroundColor: colors.primaryBtn,
    borderRadius: 24,
    paddingVertical: 14,
    alignItems: 'center',
  },
  exportBtnDisabled: { backgroundColor: colors.textDisabled },
  exportBtnText: { fontSize: 15, fontWeight: '700', color: colors.white },
});