#import <Cocoa/Cocoa.h>
#include <stdlib.h>
#include <string.h>

// cdropPasteboardChangeCount returns the general pasteboard's monotonic change
// counter. Polling it is the cheap way to detect a copy without a callback API.
long cdropPasteboardChangeCount(void) {
    return (long)[[NSPasteboard generalPasteboard] changeCount];
}

// cdropPasteboardReadText returns a malloc'd UTF-8 copy of the pasteboard's
// plain-text payload (caller frees), or NULL when there is no text (image /
// file only). It sets *sensitive to 1 when a privacy marker type is present —
// org.nspasteboard.{Concealed,Transient,AutoGenerated}Type — so the upload
// policy can skip it. (Most password managers set no marker; this is a
// best-effort secondary guard behind the server's short TTL.)
// cdropIsStagingPath 判断字符串是否为 Universal Clipboard / Handoff 的暂存文件路径——富文本
// 复制时 pasteboard 的纯文本表示有时是 .../shared-pasteboard/.../xxx.rtfd 这样的路径而非内容，
// 绝不能当剪贴板文本上传同步。
static BOOL cdropIsStagingPath(NSString *s) {
    if (s == nil) { return NO; }
    return ([s rangeOfString:@"/shared-pasteboard/"].location != NSNotFound) ||
           ([s rangeOfString:@"com.apple.coreservices.useractivityd"].location != NSNotFound);
}

// cdropPlainFromRich 从 RTF / RTFD 富文本派生纯文本（复制富文本时纯文本类型可能缺失或为暂存
// 路径）。取不到返回 nil。
static NSString *cdropPlainFromRich(NSPasteboard *pb) {
    NSData *data = [pb dataForType:NSPasteboardTypeRTFD];
    NSAttributedString *as = nil;
    if (data) {
        as = [[NSAttributedString alloc] initWithData:data
            options:@{NSDocumentTypeDocumentAttribute: NSRTFDTextDocumentType}
            documentAttributes:nil error:nil];
    }
    if (as == nil) {
        data = [pb dataForType:NSPasteboardTypeRTF];
        if (data) {
            as = [[NSAttributedString alloc] initWithData:data
                options:@{NSDocumentTypeDocumentAttribute: NSRTFTextDocumentType}
                documentAttributes:nil error:nil];
        }
    }
    return as ? as.string : nil;
}

char *cdropPasteboardReadText(int *sensitive) {
    NSPasteboard *pb = [NSPasteboard generalPasteboard];
    *sensitive = 0;
    for (NSString *type in pb.types) {
        if ([type isEqualToString:@"org.nspasteboard.ConcealedType"] ||
            [type isEqualToString:@"org.nspasteboard.TransientType"] ||
            [type isEqualToString:@"org.nspasteboard.AutoGeneratedType"]) {
            *sensitive = 1;
            break;
        }
    }
    NSString *s = [pb stringForType:NSPasteboardTypeString];
    // 纯文本缺失或取到的是 Handoff 暂存路径 → 从 RTF/RTFD 派生真正的文本。
    if (s == nil || cdropIsStagingPath(s)) {
        s = cdropPlainFromRich(pb);
    }
    if (s == nil || cdropIsStagingPath(s)) { return NULL; } // 仍拿不到文本：当非文本忽略
    const char *utf8 = [s UTF8String];
    if (utf8 == NULL) { return NULL; }
    return strdup(utf8);
}

// cdropPasteboardWriteText replaces the pasteboard's contents with plain text.
void cdropPasteboardWriteText(const char *text) {
    NSString *s = [NSString stringWithUTF8String:text];
    if (s == nil) { return; }
    NSPasteboard *pb = [NSPasteboard generalPasteboard];
    [pb clearContents];
    [pb setString:s forType:NSPasteboardTypeString];
}