//
//  ShareProvider.m
//  YuMi
//
//  Created by P on 2025/3/6.
//

#import "ShareProvider.h"
#import <UniformTypeIdentifiers/UniformTypeIdentifiers.h>

@implementation ShareProvider

- (instancetype)initWithTitle:(NSString *)title
                     subtitle:(NSString *)subtitle
                      appName:(NSString *)appName
                          url:(NSURL *)url
                        image:(UIImage *)image
                      appIcon:(UIImage *)appIcon {
    // 使用标题作为占位符
    self = [super initWithPlaceholderItem:title ?: @""];
    if (self) {
        _title = title ?: @"";
        _subtitle = subtitle ?: @"";
        _appName = appName ?: @"E-Parti";
        _url = url;
        _image = image;
        _appIcon = appIcon;
    }
    return self;
}

#pragma mark - UIActivityItemSource

// 根据不同的分享类型提供不同的内容
- (id)activityViewController:(UIActivityViewController *)activityViewController 
         itemForActivityType:(UIActivityType)activityType {
    
    if (!activityType) {
        // 默认返回完整信息
        return [self fullShareText];
    }
    
    // 邮件分享 - 返回富文本内容
    if ([activityType isEqualToString:UIActivityTypeMail]) {
        return [self emailShareText];
    }
    
    // 信息/短信分享 - 返回简洁文本
    if ([activityType isEqualToString:UIActivityTypeMessage]) {
        return [self messageShareText];
    }
    
    // 备忘录分享 - 返回详细文本
    if ([activityType containsString:@"notes"] || 
        [activityType containsString:@"Notes"]) {
        return [self notesShareText];
    }
    
    // 社交媒体分享 - 返回带话题标签的文本
    if ([activityType isEqualToString:UIActivityTypePostToTwitter] ||
        [activityType isEqualToString:UIActivityTypePostToFacebook]) {
        return [self socialShareText];
    }
    
    // AirDrop - 根据有无图片决定返回内容
    if ([activityType isEqualToString:UIActivityTypeAirDrop]) {
        if (self.image) {
            return self.image;
        } else {
            return self.url ?: [self fullShareText];
        }
    }
    
    // 复制链接 - 只返回URL
    if ([activityType isEqualToString:UIActivityTypeCopyToPasteboard]) {
        return self.url.absoluteString ?: [self fullShareText];
    }
    
    // 默认返回完整文本
    return [self fullShareText];
}

// 为邮件等应用提供主题
- (NSString *)activityViewController:(UIActivityViewController *)activityViewController
              subjectForActivityType:(UIActivityType)activityType {
    if ([activityType isEqualToString:UIActivityTypeMail]) {
        return [NSString stringWithFormat:@"来自%@的分享：%@", self.appName, self.title];
    }
    return nil;
}

// 指定数据类型（对图片分享很重要）
- (NSString *)activityViewController:(UIActivityViewController *)activityViewController
      dataTypeIdentifierForActivityType:(UIActivityType)activityType {
    
    if (self.image && [activityType isEqualToString:UIActivityTypeAirDrop]) {
        if (@available(iOS 14.0, *)) {
            return UTTypePNG.identifier;
        } else {
            return @"public.png";
        }
    }
    
    if (@available(iOS 14.0, *)) {
        return UTTypeText.identifier;
    } else {
        return @"public.plain-text";
    }
}

// 提供链接预览元数据
- (LPLinkMetadata *)activityViewControllerLinkMetadata:(UIActivityViewController *)activityViewController {
    LPLinkMetadata *metadata = [[LPLinkMetadata alloc] init];
    
    // 设置标题
    metadata.title = self.title;
    
    // 使用 originalURL 技巧显示副标题
    if (self.subtitle.length > 0) {
        metadata.originalURL = [NSURL fileURLWithPath:self.subtitle];
    }
    
    // 设置实际URL
    if (self.url) {
        metadata.URL = self.url;
    }
    
    // 设置图标 - 优先使用应用图标，其次使用分享图片
    UIImage *iconToUse = self.appIcon ?: self.image;
    if (iconToUse) {
        metadata.iconProvider = [[NSItemProvider alloc] initWithObject:iconToUse];
    }
    
    // 如果有图片且不同于图标，设置为预览图
    if (self.image && self.image != iconToUse) {
        metadata.imageProvider = [[NSItemProvider alloc] initWithObject:self.image];
    }
    
    return metadata;
}

#pragma mark - 私有方法 - 不同分享文本格式

- (NSString *)fullShareText {
    NSMutableString *text = [NSMutableString string];
    
    if (self.title.length > 0) {
        [text appendFormat:@"📱 %@\n\n", self.title];
    }
    
    if (self.subtitle.length > 0) {
        [text appendFormat:@"%@\n\n", self.subtitle];
    }
    
    if (self.url) {
        [text appendFormat:@"🔗 %@\n\n", self.url.absoluteString];
    }
    
    [text appendFormat:@"—— 来自 %@ ——", self.appName];
    
    return text.copy;
}

- (NSString *)emailShareText {
    NSMutableString *text = [NSMutableString string];
    
    [text appendString:@"<html><body>"];
    
    if (self.title.length > 0) {
        [text appendFormat:@"<h2>📱 %@</h2>", self.title];
    }
    
    if (self.subtitle.length > 0) {
        [text appendFormat:@"<p>%@</p>", self.subtitle];
    }
    
    if (self.url) {
        [text appendFormat:@"<p><a href=\"%@\">🔗 点击访问</a></p>", self.url.absoluteString];
    }
    
    [text appendFormat:@"<br><hr><small>通过 %@ 分享</small>", self.appName];
    [text appendString:@"</body></html>"];
    
    return text.copy;
}

- (NSString *)messageShareText {
    if (self.url) {
        return [NSString stringWithFormat:@"📱 %@\n%@", self.title, self.url.absoluteString];
    }
    return [NSString stringWithFormat:@"📱 %@\n%@", self.title, self.subtitle];
}

- (NSString *)notesShareText {
    NSMutableString *text = [NSMutableString string];
    
    [text appendFormat:@"📝 %@\n", self.title];
    [text appendString:@"━━━━━━━━━━━━━━━━━━━━\n\n"];
    
    if (self.subtitle.length > 0) {
        [text appendFormat:@"📄 %@\n\n", self.subtitle];
    }
    
    if (self.url) {
        [text appendFormat:@"🔗 链接：%@\n\n", self.url.absoluteString];
    }
    
    NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
    formatter.dateFormat = @"yyyy-MM-dd HH:mm";
    [text appendFormat:@"⏰ 保存时间：%@\n", [formatter stringFromDate:[NSDate date]]];
    [text appendFormat:@"📱 来源：%@", self.appName];
    
    return text.copy;
}

- (NSString *)socialShareText {
    NSMutableString *text = [NSMutableString string];
    
    if (self.title.length > 0) {
        [text appendFormat:@"📱 %@ ", self.title];
    }
    
    if (self.url) {
        [text appendFormat:@"%@ ", self.url.absoluteString];
    }
    
    [text appendFormat:@"#%@ #分享 #推荐", [self.appName stringByReplacingOccurrencesOfString:@" " withString:@""]];
    
    return text.copy;
}

@end