import (
	ionhash "github.com/amzn/ion-hash-go"
)

// Create a hasher provider, using MD5
hasherProvider := ionhash.NewCryptoHasherProvider("MD5")

// Create an Ion reader over the input [1,2,3]
ionReader := ion.NewReaderString("[1,2,3]")

// Create a hash reader
hashReader, err := ionhash.NewHashReader(ionReader, hasherProvider)
if err != nil {
	panic(err)
}

// Read over the top level value and calculate its hash
hashReader.Next()
hashReader.Next()


// Get the hash value
res, err := hashReader.Sum(nil)
if err != nil {
	panic(err)
}

// Print out the hash in Hex
fmt.Printf("Digest = %x\n", res) // prints: Digest = 8f3bf4b1935cf469c9c10c31524b2625

// Create a hasher provider, using MD5
hasherProvider := ionhash.NewCryptoHasherProvider("MD5")

// Create an Ion writer
ionWriter := ion.NewTextWriter(new(bytes.Buffer))

// Create a hash writer
hashWriter, err := ionhash.NewHashWriter(ionWriter, hasherProvider)
if err != nil {
	panic(err)
}

// Write the list [1,2,3]
hashWriter.BeginList()
hashWriter.WriteInt(1)
hashWriter.WriteInt(2)
hashWriter.WriteInt(3)
hashWriter.EndList()

// Get the hash value
res, err := hashWriter.Sum(nil)
if err != nil {
	panic(err)
}

// Print out the hash in Hex
fmt.Printf("Digest = %x\n", res) // prints: Digest = 8f3bf4b1935cf469c9c10c31524b2625/