# Low-level block management
proc ::nano::block::dict::toBlock {blockDict} {
	array set block $blockDict

	switch -- $block(type) {
		"state" {

			append blockData [::nano::address::toPublicKey $block(account)]
			append blockData [binary decode hex $block(previous)]
			append blockData [::nano::address::toPublicKey $block(representative)]
			append blockData [binary decode hex [format %032llX $block(balance)]]
			if {![info exists block(link)] && [info exists block(link_as_account)]} {
				append blockData [::nano::address::toPublicKey $block(link_as_account)]
			} else {

	}]
	set blockJSONEntries [join $blockJSONEntries]

	set blockJSON [json::write object {*}$blockJSONEntries]

	return $blockJSON
}

proc ::nano::block::typeIDFromType {type} {
	set outputFormat decimal
	foreach arg $args {
		switch -exact -- $arg {
			"-dec" - "-decimal" {
				set outputFormat "decimal"
			}
			"-hex" {
				set outputFormat "hex"
			}
			"-binary" {
				set outputFormat "bytes"
			}
			default {
				return -code error "Invalid option: $arg"
			}
		}
	}

	switch -- $type {
		"invalid"     { set typeId 0 }
		"not_a_block" { set typeId 1 }
		"send"        { set typeId 2 }
		"receive"     { set typeId 3 }
		"open"        { set typeId 4 }
		"change"      { set typeId 5 }
		"state"       { set typeId 6 }
	}

	switch -- $outputFormat {
		"decimal" {
			set result $typeId
		}
		"hex" {
			set result [format %02x $typeId]
		}
		"bytes" {
			set result [binary decode hex [format %02x $typeId]]
		}
	}

	return $result
}

proc ::nano::block::typeFromTypeID {typeId args} {
	set inputFormat decimal
	foreach arg $args {
		switch -exact -- $arg {
			"-dec" - "-decimal" {
				set inputFormat "decimal"
			}
			"-hex" {
				set inputFormat "hex"
			}
			"-binary" {
				set inputFormat "bytes"
			}
			default {
				return -code error "Invalid option: $arg"
			}
		}
	}

	switch -- $inputFormat {
		"decimal" { }
		"hex" {
			if {![string match "0x*" $typeId]} {
				set typeId "0x${typeId}"
			}
		}
		"bytes" {
			set typeId [binary encode hex $typeId]
			set typeId "0x${typeId}"
		}
	}

	switch -- [format %i $typeId] {
		0 { set type "invalid" }
		1 { set type "not_a_block" }
		2 { set type "send" }
		3 { set type "receive" }
		4 { set type "open" }
		5 { set type "change" }
		6 { set type "state" }
	}

	return $type
}

proc ::nano::block::lengthFromType {type args} {
	set includeType false
	set includeWork false
	set includeSig  false
	foreach arg $args {
		switch -exact -- $arg {
			"-full" {
				set includeType true
				set includeWork true
				set includeSig  true
			}
			"-work" {
				set includeWork true
			}
			"-signature" {
				set includeSig  true
			}
			"-type" {
				set includeType true
			}
			default {
				return -code error "Invalid option: $arg"
			}
		}
	}

	switch -- $type {
		"invalid" - "not_a_block" {
			set length 0
			set includeWork false
			set includeSig false
		}
		"state"   { set length 144 }
		"open"    { set length 96  }
		"send"    { set length 80  }
		"receive" { set length 64  }
		"change"  { set length 64  }
		default {
			return -code error "Unknown type: $type"
		}
	}

	if {$includeType} {
		incr length
	}

	if {$includeWork} {
		incr length 8
	}

	if {$includeSig} {
		incr length 64
	}

	return $length
}

proc ::nano::block::typeFromLength {length} {
	switch -- $length {
		144 { set type state }
		96  { set type open  }
		80  { set type send  }
		default {
			return -code error "Ambigious"
		}
	}

	return $type
}

proc ::nano::block::dict::fromBlock {blockData args} {
	set block(_blockData) $blockData
	set block(type) ""
	set addressPrefix "nano_"
	foreach arg $args {
		switch -glob -- $arg {
			"-type=*" {
				set block(type) [lindex [split $arg =] 1]
			}

			}
			default {
			}
		}
	}

	if {$block(type) eq ""} {
		if {[catch {
			set block(type) [::nano::block::typeFromLength [string length $blockData]]


		}]} {
			return -code error "Unable to parse block, must specify type"

		}
	}

	set addArgs_fromPublicKey [list]
	if {$addressPrefix eq "xrb_"} {
		lappend addArgs_fromPublicKey "-xrb"
	}

	switch -- $block(type) {
		"state" {
			binary scan $blockData a32H64a32H32H64H128H16 \

				block(account) \
				block(previous) \
				block(representative) \
				block(balance) \
				block(link) \
				block(signature) \

				block(work)
		}

		"open" {
			binary scan $blockData H64a32a32H128H16 \
				block(source) \
				block(representative) \
				block(account) \
				block(signature) \
				block(work)

			set block(_workData) $block(account)
		}
		"send" {
			binary scan $blockData H64a32H32H128H16 \
				block(previous) \
				block(destination) \
				block(balance) \
				block(signature) \
				block(work)

			set block(_workData) $block(previous)
		}
		"receive" {
			binary scan $blockData H64H64H128H16 \
				block(previous) \
				block(source) \
				block(signature) \
				block(work)

			set block(_workData) $block(previous)
		}
		"change" {
			binary scan $blockData H64a32H128H16 \
				block(previous) \
				block(representative) \
				block(signature) \
				block(work)

			set block(_workData) $block(previous)
		}
		default {
			return -code error "Invalid block type: $block(type)"
		}
	}

	foreach field {account representative link_as_account destination balance work signature} {
		if {![info exists block($field)]} {
			continue
		}

		switch -exact -- $field {
			"account" - "representative" - "link_as_account" - "destination" {
				set block($field) [::nano::address::fromPublicKey $block($field) {*}$addArgs_fromPublicKey]
			}
			"balance" {
				set block($field) [format %lli "0x$block($field)"]
			}
		}
	}



	return [array get block]
}

proc ::nano::block::json::fromBlock {blockData args} {
	set blockDict [::nano::block::dict::fromBlock $blockData {*}$args]

	set blockJSON [::nano::block::json::fromDict $blockDict]

	return $blockJSON
}

proc ::nano::block::_hash {blockData args} {
	set outputFormat "bytes"
	foreach arg $args {
		switch -exact -- $arg {
			"-hex" {
				set outputFormat "hex"
			}
			"-binary" {

	if {$outputFormat eq "hex"} {
		set hash [string toupper [binary encode hex $hash]]
	}

	return $hash
}

proc ::nano::block::dict::toHash {blockDict args} {
	if {[dict get $blockDict type] eq "state"} {
		set blockData $::nano::block::stateBlockPreamble
	}

	append blockData [::nano::block::dict::toBlock $blockDict]

	tailcall ::nano::block::_hash $blockData {*}$args
}

proc ::nano::block::json::toHash {blockJSON args} {
	set blockDict [::nano::block::dict::fromJSON $blockJSON]

	tailcall ::nano::block::dict::toHash $blockDict {*}$args
}

proc ::nano::block::signBlockHash {blockHash privateKey args} {
	set outputFormat "bytes"
	foreach arg $args {
		switch -exact -- $arg {
			"-hex" {
				set outputFormat "hex"

	if {$outputFormat eq "hex"} {
		set signature [string toupper [binary encode hex $signature]]
	}

	return $signature
}

proc ::nano::block::_sign {blockData args} {
	set blockHash [::nano::block::_hash $blockData]

	tailcall ::nano::block::signBlockHash $blockHash {*}$args
}

proc ::nano::block::verifyBlockHash {blockHash signature publicKey} {
	if {[string length $blockHash] != $::nano::block::hashLength} {
		set blockHash [binary decode hex $blockHash]

	}

	set valid [::nano::internal::verifyDetached $blockHash $signature $publicKey]

	return $valid
}

proc ::nano::block::_verifyBlock {blockData args} {
	set blockHash [::nano::block::_hash $blockData]

	tailcall ::nano::block::verifyBlockHash $blockHash {*}$args
}

proc ::nano::block::dict::_addBlockData {blockDict} {
	if {[dict exists $blockDict _blockData]} {
		return $blockDict

	if {[dict exists $blockDict _blockHash]} {
		return $blockDict
	}

	set blockDict [_addBlockData $blockDict]
	set blockData [dict get $blockDict _blockData]

	if {[dict get $blockDict type] eq "state"} {
		set blockData "${::nano::block::stateBlockPreamble}${blockData}"
	}

	set blockHash [::nano::block::_hash $blockData -binary]

	dict set blockDict _blockHash $blockHash

	return $blockDict
}

proc ::nano::block::dict::sign {blockDict privateKey args} {

	foreach proc $procs {
		proc ::nano::node::ledger::$proc args [concat [list tailcall {*}$handle $proc] {{*}$args}]
	}
}

proc ::nano::node::configure {network args} {
	package require ip
	package require dns

	# Set default options
	## XXX:TODO: Handle other networks
	if {$network ne "main"} {
		return -code error "Only main network is supported right now"
	}
	set info(-configDirectory) [file normalize ~/RaiBlocks]

		}
	}

	return [string range $retval 0 143]
}

proc ::nano::network::client {sock messageType args} {
	set versionUsing 7
	set versionMin 7
	set versionMax 7
	set extensions 0

	set messageType [string tolower $messageType]
	set messageTypeID [lsearch -exact $::nano::network::messageTypes $messageType]
	if {$messageTypeID == -1} {
		return -code error "Invalid message type: $messageType"
	}

	if {$packetMagic ne "RC"} {
		return ""
	}

	# XXX:TODO: Check versions and extensions

	set messageType [lindex $::nano::network::messageTypes $messageTypeID]
#puts "*** Incoming: $messageType ($messageTypeID on $networkType) [binary encode hex $message]"

	set retval ""
	if {[catch {
		set retval [::nano::node::server::${messageType} $args]
	} err]} {
		if {![string match "invalid command name *" $err]} {
			::nano::node::log "Error handling ${messageType}: $err"

		::nano::node::_sleep [expr {1 * 60 * 1000}]
	}
}

proc ::nano::node::start {} {
	package require defer

	package require udp


	coroutine ::nano::node::bootstrap::run ::nano::node::bootstrap
	coroutine ::nano::node::realtime::run ::nano::node::realtime

	vwait ::nano::node::_FOREVER_
}