/**
 * 编辑资料页 EditProfileScreen - Twitter/X 风格
 * 威友 - 编辑用户资料
 * 与 Twitter/X 个人资料编辑页样式一致
 */

import React, { useState, useMemo } from 'react';
import {
  View,
  ScrollView,
  StyleSheet,
  TouchableOpacity,
  TextInput,
  Alert,
  KeyboardAvoidingView,
  Platform,
  Image,
} from 'react-native';
import { SafeAreaView, useSafeAreaInsets } from 'react-native-safe-area-context';
import { useNavigation } from '@react-navigation/native';
import { MaterialCommunityIcons } from '@expo/vector-icons';
import * as ImagePicker from 'expo-image-picker';
import {
  spacing,
  fontSizes,
  borderRadius,
  useAppColors,
  type AppColors,
} from '../../theme';
import { useAuthStore } from '../../stores';
import { Avatar, Text } from '../../components/common';
import { authService, uploadService } from '../../services';
import { useResponsive, useResponsiveSpacing } from '../../hooks';

function createEditProfileStyles(colors: AppColors) {
  return StyleSheet.create({
    container: {
      flex: 1,
      backgroundColor: colors.background.default,
    },
    keyboardView: {
      flex: 1,
    },
    scrollContent: {
      paddingBottom: spacing.xl,
    },

    // ===== 封面区域 - Twitter 风格全宽 =====
    coverContainer: {
      position: 'relative',
      backgroundColor: colors.background.default,
    },
    coverTouchable: {
      width: '100%',
      height: '100%',
    },
    coverImage: {
      width: '100%',
      height: '100%',
    },
    coverFallback: {
      width: '100%',
      height: '100%',
      backgroundColor: colors.primary.main,
      justifyContent: 'center',
      alignItems: 'center',
    },
    coverOverlay: {
      ...StyleSheet.absoluteFillObject,
      backgroundColor: 'rgba(0, 0, 0, 0.4)',
      justifyContent: 'center',
      alignItems: 'center',
    },

    // ===== 信息区 =====
    infoSection: {
      paddingHorizontal: spacing.lg,
      paddingBottom: spacing.md,
      backgroundColor: colors.background.paper,
    },
    avatarActionRow: {
      flexDirection: 'row',
      justifyContent: 'space-between',
      alignItems: 'flex-end',
      marginBottom: spacing.sm,
    },
    avatarWrapper: {
      // 负边距在 inline style 中计算
    },
    avatarContainer: {
      borderRadius: borderRadius.full,
      backgroundColor: colors.background.paper,
      padding: 3,
      justifyContent: 'center',
      alignItems: 'center',
      position: 'relative',
    },
    avatarOverlay: {
      position: 'absolute',
      top: 3,
      left: 3,
      right: 3,
      bottom: 3,
      borderRadius: borderRadius.full,
      backgroundColor: 'rgba(0, 0, 0, 0.4)',
      justifyContent: 'center',
      alignItems: 'center',
    },
    editAvatarButton: {
      position: 'absolute',
      bottom: 4,
      right: 4,
      width: 28,
      height: 28,
      borderRadius: 14,
      backgroundColor: colors.primary.main,
      justifyContent: 'center',
      alignItems: 'center',
      borderWidth: 2,
      borderColor: colors.background.paper,
    },

    // 名字预览
    nameSection: {
      marginBottom: spacing.sm,
    },
    nickname: {
      fontSize: fontSizes['2xl'],
      fontWeight: '800',
      color: colors.text.primary,
      marginBottom: 2,
    },
    username: {
      fontSize: fontSizes.md,
      color: colors.text.hint,
    },

    // 编辑提示
    editHint: {
      flexDirection: 'row',
      alignItems: 'center',
      marginTop: spacing.xs,
      gap: spacing.xs,
    },
    editHintText: {
      fontSize: fontSizes.xs,
      color: colors.text.hint,
    },

    // ===== 表单区域 - Twitter 风格全宽卡片 =====
    formSection: {
      backgroundColor: colors.background.paper,
      marginTop: spacing.md,
      borderTopWidth: StyleSheet.hairlineWidth,
      borderBottomWidth: StyleSheet.hairlineWidth,
      borderColor: colors.divider,
    },
    formField: {
      paddingHorizontal: spacing.lg,
      paddingVertical: spacing.md,
      borderBottomWidth: StyleSheet.hairlineWidth,
      borderBottomColor: colors.divider,
    },
    formFieldLast: {
      borderBottomWidth: 0,
    },
    fieldLabel: {
      fontSize: fontSizes.sm,
      fontWeight: '500',
      color: colors.text.secondary,
      marginBottom: spacing.xs,
    },
    fieldInput: {
      fontSize: fontSizes.md,
      color: colors.text.primary,
      paddingVertical: spacing.xs,
    },
    textArea: {
      height: 80,
      textAlignVertical: 'top',
    },
    disabledInput: {
      color: colors.text.disabled,
    },
    charCount: {
      textAlign: 'right',
      marginTop: spacing.xs,
    },

    // 保存按钮
    buttonContainer: {
      marginTop: spacing.lg,
      paddingHorizontal: spacing.lg,
    },
    saveButton: {
      height: 48,
      backgroundColor: colors.text.primary,
      borderRadius: borderRadius.full,
      alignItems: 'center',
      justifyContent: 'center',
    },
    saveButtonDisabled: {
      opacity: 0.5,
    },
    saveButtonText: {
      color: colors.background.paper,
      fontSize: fontSizes.md,
      fontWeight: '700',
    },
  });
}

type EditProfileSheet = ReturnType<typeof createEditProfileStyles>;

interface FormFieldProps {
  label: string;
  value: string;
  onChangeText: (text: string) => void;
  placeholder: string;
  maxLength?: number;
  multiline?: boolean;
  numberOfLines?: number;
  autoCapitalize?: 'none' | 'sentences' | 'words' | 'characters';
  keyboardType?: 'default' | 'email-address' | 'numeric' | 'phone-pad' | 'url';
  editable?: boolean;
  sheet: EditProfileSheet;
  colors: AppColors;
  isLast?: boolean;
}

const FormField: React.FC<FormFieldProps> = ({
  label,
  value,
  onChangeText,
  placeholder,
  maxLength,
  multiline = false,
  numberOfLines = 1,
  autoCapitalize = 'sentences',
  keyboardType = 'default',
  editable = true,
  sheet,
  colors,
  isLast = false,
}) => {
  return (
    <View style={[sheet.formField, isLast && sheet.formFieldLast]}>
      <Text style={sheet.fieldLabel}>{label}</Text>
      <TextInput
        style={[
          sheet.fieldInput,
          multiline && sheet.textArea,
          !editable && sheet.disabledInput
        ]}
        value={value}
        onChangeText={onChangeText}
        placeholder={placeholder}
        placeholderTextColor={colors.text.hint}
        maxLength={maxLength}
        multiline={multiline}
        numberOfLines={numberOfLines}
        autoCapitalize={autoCapitalize}
        keyboardType={keyboardType}
        editable={editable}
      />
      {maxLength && (
        <Text variant="caption" color={colors.text.hint} style={sheet.charCount}>
          {value.length}/{maxLength}
        </Text>
      )}
    </View>
  );
};

export const EditProfileScreen: React.FC = () => {
  const colors = useAppColors();
  const styles = useMemo(() => createEditProfileStyles(colors), [colors]);
  const navigation = useNavigation();
  const { currentUser, updateUser } = useAuthStore();
  const { isWideScreen, isMobile, width } = useResponsive();
  const responsivePadding = useResponsiveSpacing({ xs: 0, sm: 0, md: 0, lg: 24, xl: 32 });
  const insets = useSafeAreaInsets();

  const [nickname, setNickname] = useState(currentUser?.nickname || '');
  const [bio, setBio] = useState(currentUser?.bio || '');
  const [location, setLocation] = useState(currentUser?.location || '');
  const [website, setWebsite] = useState(currentUser?.website || '');
  const [phone, setPhone] = useState(currentUser?.phone || '');
  const [email, setEmail] = useState(currentUser?.email || '');
  const [avatar, setAvatar] = useState(currentUser?.avatar || '');
  const [coverUrl, setCoverUrl] = useState(currentUser?.cover_url || '');
  const [uploadingAvatar, setUploadingAvatar] = useState(false);
  const [uploadingCover, setUploadingCover] = useState(false);
  const [saving, setSaving] = useState(false);

  const scrollBottomInset = isMobile ? 64 + 24 + insets.bottom + spacing.md : spacing.lg;
  const coverHeight = isWideScreen ? Math.min((width * 10) / 16, 320) : (width * 10) / 16;
  const avatarSize = isWideScreen ? 120 : 88;

  const handlePickCover = async () => {
    const permissionResult = await ImagePicker.requestMediaLibraryPermissionsAsync();
    if (!permissionResult.granted) {
      Alert.alert('权限不足', '需要访问相册权限来选择头图');
      return;
    }

    const result = await ImagePicker.launchImageLibraryAsync({
      mediaTypes: 'images',
      allowsEditing: true,
      aspect: [16, 9],
      quality: 0.9,
    });

    if (!result.canceled && result.assets[0]) {
      const selectedImage = result.assets[0];
      setCoverUrl(selectedImage.uri);

      try {
        setUploadingCover(true);
        const uploadResult = await uploadService.uploadCover({
          uri: selectedImage.uri,
          name: selectedImage.fileName || 'cover.jpg',
          type: selectedImage.mimeType || 'image/jpeg',
        });

        if (uploadResult) {
          updateUser({ cover_url: uploadResult.url });
          Alert.alert('成功', '头图已更新');
        } else {
          Alert.alert('错误', '头图上传失败，请重试');
        }
      } catch (error) {
        console.error('上传头图失败:', error);
        Alert.alert('错误', '头图上传失败，请重试');
      } finally {
        setUploadingCover(false);
      }
    }
  };

  const handlePickAvatar = async () => {
    const permissionResult = await ImagePicker.requestMediaLibraryPermissionsAsync();
    if (!permissionResult.granted) {
      Alert.alert('权限不足', '需要访问相册权限来选择头像');
      return;
    }

    const result = await ImagePicker.launchImageLibraryAsync({
      mediaTypes: 'images',
      allowsEditing: true,
      aspect: [1, 1],
      quality: 0.8,
    });

    if (!result.canceled && result.assets[0]) {
      const selectedImage = result.assets[0];
      setAvatar(selectedImage.uri);

      try {
        setUploadingAvatar(true);
        const uploadResult = await uploadService.uploadAvatar({
          uri: selectedImage.uri,
          name: selectedImage.fileName || 'avatar.jpg',
          type: selectedImage.mimeType || 'image/jpeg',
        });

        if (uploadResult) {
          updateUser({ avatar: uploadResult.url });
          Alert.alert('成功', '头像已更新');
        } else {
          Alert.alert('错误', '头像上传失败，请重试');
        }
      } catch (error) {
        console.error('上传头像失败:', error);
        Alert.alert('错误', '头像上传失败，请重试');
      } finally {
        setUploadingAvatar(false);
      }
    }
  };

  const handleSave = async () => {
    if (!nickname.trim()) {
      Alert.alert('错误', '昵称不能为空');
      return;
    }

    if (email && !/^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(email)) {
      Alert.alert('错误', '请输入正确的邮箱地址');
      return;
    }

    if (phone && !/^1[3-9]\d{9}$/.test(phone)) {
      Alert.alert('错误', '请输入正确的手机号');
      return;
    }

    setSaving(true);

    try {
      const updatedUser = await authService.updateUser({
        nickname: nickname.trim(),
        bio: bio.trim() || undefined,
        location: location.trim() || undefined,
        website: website.trim() || undefined,
        phone: phone.trim() || undefined,
        email: email.trim() || undefined,
      });

      if (updatedUser) {
        updateUser({
          nickname: nickname.trim(),
          bio: bio.trim() || undefined,
          location: location.trim() || undefined,
          website: website.trim() || undefined,
          phone: phone.trim() || undefined,
          email: email.trim() || undefined,
        });

        Alert.alert('成功', '资料已更新', [
          { text: '确定', onPress: () => navigation.goBack() }
        ]);
      } else {
        Alert.alert('错误', '保存失败，请重试');
      }
    } catch (error) {
      console.error('保存资料失败:', error);
      Alert.alert('错误', '保存失败，请重试');
    } finally {
      setSaving(false);
    }
  };

  const renderFormContent = () => (
    <>
      {/* ===== 封面区域 - Twitter 风格全宽 ===== */}
      <View style={[styles.coverContainer, { height: coverHeight }]}>
        <TouchableOpacity
          style={styles.coverTouchable}
          onPress={handlePickCover}
          activeOpacity={0.8}
        >
          {coverUrl ? (
            <Image
              source={{ uri: coverUrl }}
              style={styles.coverImage}
              resizeMode="cover"
            />
          ) : (
            <View style={styles.coverFallback}>
              <MaterialCommunityIcons name="image-outline" size={48} color="rgba(255,255,255,0.4)" />
            </View>
          )}

          {uploadingCover ? (
            <View style={styles.coverOverlay}>
              <MaterialCommunityIcons name="loading" size={32} color={colors.text.inverse} />
            </View>
          ) : (
            <View style={styles.coverOverlay}>
              <MaterialCommunityIcons name="camera" size={28} color={colors.text.inverse} />
            </View>
          )}
        </TouchableOpacity>
      </View>

      {/* ===== 用户信息区 - Twitter 风格左对齐 ===== */}
      <View style={styles.infoSection}>
        <View style={styles.avatarActionRow}>
          <View style={[styles.avatarWrapper, { marginTop: -avatarSize / 2 }]}>
            <TouchableOpacity
              style={[styles.avatarContainer, { width: avatarSize, height: avatarSize }]}
              onPress={handlePickAvatar}
              activeOpacity={0.8}
            >
              <Avatar
                source={avatar || null}
                size={avatarSize - 6}
                name={nickname}
              />
              {uploadingAvatar && (
                <View style={styles.avatarOverlay}>
                  <MaterialCommunityIcons name="loading" size={24} color={colors.text.inverse} />
                </View>
              )}
              <View style={styles.editAvatarButton}>
                <MaterialCommunityIcons name="camera" size={14} color={colors.text.inverse} />
              </View>
            </TouchableOpacity>
          </View>
        </View>

        <View style={styles.nameSection}>
          <Text style={styles.nickname}>{nickname || currentUser?.nickname || ''}</Text>
          <Text style={styles.username}>@{currentUser?.username || ''}</Text>
        </View>

        <View style={styles.editHint}>
          <MaterialCommunityIcons name="information-outline" size={12} color={colors.text.hint} />
          <Text style={styles.editHintText}>点击头像或头图可更换照片</Text>
        </View>
      </View>

      {/* ===== 表单区域 - Twitter 风格全宽分组 ===== */}
      <View style={styles.formSection}>
        <FormField
          label="昵称"
          value={nickname}
          onChangeText={setNickname}
          placeholder="请输入昵称"
          maxLength={20}
          sheet={styles}
          colors={colors}
        />

        <FormField
          label="个人简介"
          value={bio}
          onChangeText={setBio}
          placeholder="介绍一下自己"
          maxLength={100}
          multiline
          numberOfLines={3}
          sheet={styles}
          colors={colors}
        />

        <FormField
          label="地区"
          value={location}
          onChangeText={setLocation}
          placeholder="你所在的城市"
          maxLength={30}
          sheet={styles}
          colors={colors}
        />

        <FormField
          label="个人网站"
          value={website}
          onChangeText={setWebsite}
          placeholder="https://example.com"
          maxLength={100}
          autoCapitalize="none"
          keyboardType="url"
          sheet={styles}
          colors={colors}
          isLast
        />
      </View>

      {/* 联系方式区域 */}
      <View style={[styles.formSection, { marginTop: spacing.md }]}>
        <FormField
          label="手机号"
          value={phone}
          onChangeText={setPhone}
          placeholder="请输入手机号"
          maxLength={11}
          keyboardType="phone-pad"
          sheet={styles}
          colors={colors}
        />

        <FormField
          label="邮箱"
          value={email}
          onChangeText={setEmail}
          placeholder="请输入邮箱地址"
          maxLength={100}
          autoCapitalize="none"
          keyboardType="email-address"
          sheet={styles}
          colors={colors}
          isLast
        />
      </View>

      {/* 保存按钮 */}
      <View style={[styles.buttonContainer, { marginBottom: scrollBottomInset }]}>
        <TouchableOpacity
          style={[
            styles.saveButton,
            (saving || uploadingAvatar || uploadingCover) && styles.saveButtonDisabled
          ]}
          onPress={handleSave}
          disabled={saving || uploadingAvatar || uploadingCover}
          activeOpacity={0.8}
        >
          <Text style={styles.saveButtonText}>
            {saving ? '保存中...' : '保存修改'}
          </Text>
        </TouchableOpacity>
      </View>
    </>
  );

  return (
    <SafeAreaView style={styles.container} edges={['bottom']}>
      <KeyboardAvoidingView
        behavior={Platform.OS === 'ios' ? 'padding' : 'height'}
        style={styles.keyboardView}
      >
        <ScrollView
          contentContainerStyle={[styles.scrollContent, { paddingHorizontal: responsivePadding }]}
          showsVerticalScrollIndicator={false}
        >
          {renderFormContent()}
        </ScrollView>
      </KeyboardAvoidingView>
    </SafeAreaView>
  );
};

export default EditProfileScreen;
