package cloud.lunarsky.store;
import java.nio.file.*;
import java.io.*;
import java.util.Arrays;

public final class StoreTest {
    interface Operation {void run() throws Exception;}
    static void fails(int status,Operation operation)throws Exception{
        try{operation.run();throw new AssertionError("Expected "+status);}catch(StoreException error){if(error.status!=status)throw error;}
    }
    static DiskStore.Metadata put(DiskStore store,String key,byte[] body,boolean only)throws Exception{
        return store.put("test",key,new ByteArrayInputStream(body),body.length,SigV4.hex(SigV4.hash(body)),null,only);
    }
    public static void main(String[] args)throws Exception{
        var headers=new com.sun.net.httpserver.Headers();
        headers.set("host","examplebucket.s3.amazonaws.com");headers.set("range","bytes=0-9");
        headers.set("x-amz-date","20130524T000000Z");
        headers.set("x-amz-content-sha256","e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855");
        headers.set("authorization","AWS4-HMAC-SHA256 Credential=AKIAIOSFODNN7EXAMPLE/20130524/us-east-1/s3/aws4_request,SignedHeaders=host;range;x-amz-content-sha256;x-amz-date,Signature=f0e8bdb87c964420e857bd35b5d6ed310bd44f0170aba48dd91039c6036bdb41");
        var clock=java.time.Clock.fixed(java.time.Instant.parse("2013-05-24T00:00:00Z"),java.time.ZoneOffset.UTC);
        var auth=new SigV4("AKIAIOSFODNN7EXAMPLE","wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY","us-east-1",clock);
        var uri=java.net.URI.create("/test.txt");auth.verify("GET",uri,headers);
        fails(403,()->auth.verify("GET",java.net.URI.create("/other.txt"),headers));
        fails(403,()->auth.verify("DELETE",uri,headers));
        fails(403,()->new SigV4("AKIAIOSFODNN7EXAMPLE","wrong","us-east-1",clock).verify("GET",uri,headers));
        fails(403,()->new SigV4("AKIAIOSFODNN7EXAMPLE","wrong","us-east-1",java.time.Clock.systemUTC()).verify("GET",uri,headers));
        headers.add("host","duplicate");fails(403,()->auth.verify("GET",uri,headers));
        System.out.println("SigV4 official vector and tampering tests passed");
        Path root=Files.createTempDirectory("store-test-");
        try{
            try(var store=new DiskStore(root,8,10)){
                byte[] body={1,2,3,4,5,6};
                put(store,"../nested/☾",body,true);
                try(var obj=store.open("test","../nested/☾")){if(!Arrays.equals(body,obj.stream().readAllBytes()))throw new AssertionError("Roundtrip");}
                fails(412,()->put(store,"../nested/☾",new byte[]{9},true));
                fails(507,()->put(store,"second",body,true));
                fails(413,()->put(store,"large",new byte[9],true));
                fails(400,()->store.put("test","bad",new ByteArrayInputStream(body),6,"0".repeat(64),null,true));
                fails(400,()->store.put("test","short",new ByteArrayInputStream(body),7,SigV4.hex(SigV4.hash(body)),null,true));
                fails(404,()->store.open("test","bad"));
                put(store,"../nested/☾",new byte[]{9},false);
                put(store,"empty",new byte[0],true);
                try {
                    new DiskStore(root,8,10);
                    throw new AssertionError("A second process opened the same data directory");
                } catch(IOException expected) {
                    if(!expected.getMessage().contains("already in use"))throw expected;
                }
            }
            try(var restarted=new DiskStore(root,8,10)){
                try(var obj=restarted.open("test","../nested/☾")){if(obj.stream().read()!=9)throw new AssertionError("Persistence");}
                restarted.delete("test","../nested/☾");restarted.delete("test","../nested/☾");
                fails(404,()->restarted.open("test","../nested/☾"));
            }
            String id=SigV4.hex(SigV4.hash("test/empty".getBytes(java.nio.charset.StandardCharsets.UTF_8)));
            Files.write(root.resolve("objects").resolve(id.substring(0,2)).resolve(id),new byte[]{1},StandardOpenOption.APPEND);
            try {
                new DiskStore(root,8,10);
                throw new AssertionError("A damaged object record was accepted");
            } catch(IOException expected) {
                if(!expected.getMessage().contains("object record"))throw expected;
            }
            try(var pending=Files.list(root.resolve("pending"))){if(pending.count()!=0)throw new AssertionError("Pending cleanup");}
            System.out.println("Java storage tests passed: roundtrip, quota, integrity, persistence, locking, corruption, delete");
        }finally{try(var paths=Files.walk(root)){for(var p:paths.sorted(java.util.Comparator.reverseOrder()).toList())Files.delete(p);}}
    }
}