require "kemal"
require "../*"
require "io"
require "file"
require "exception"
require "crypto/bcrypt/password"
require "uuid"
require "uuid/json"
require "socket/udp_socket"
require "../../config"

def fread(file) : String
	slc = Bytes.new file.size
	count = file.read slc
	String.new slc[0, count]
end

def authenticate(user : String, token : UUID) : (User | Nil)
	user_file : User | Nil = nil
	user_file = KVStore.access.fetch!("user/"+user)
	if user_file.nil?
		return nil
	end
	if nil == user_file.not_nil!.tokens.not_nil!.find{ |tok| token == tok}
		nil
	else
		user_file.not_nil!.password_hash = ""
		user_file
	end
end

def authenticate!(user : String, token : UUID) : User
    authenticate(user, token).not_nil!
end

def authenticate_admin!(user : String, token : UUID) : User
    user = authenticate(user, token).not_nil!
    if(user.type==UserType::Administrator)
        return user
    end
    raise "Administrator only"
end

ws "/socket/user/authenticate" do |socket|
	socket.on_message do |message|
		json = JSON.parse(message)
		if(authenticate(json["user"].to_s, UUID.new(json["api_token"].to_s)).nil?)
			json.as_h.["valid"]=JSON::Any.new false
		else
			json.as_h.["valid"]=JSON::Any.new true
		end
		socket.send json.to_json
	end
end

udp_listener = UDPSocket.new
udp_listener.bind "0.0.0.0", 3000
udp_mutex = Mutex.new
(1..Statics.nb_udp_listeners).each do
	spawn do
		while true
			message : String | Nil = nil
			address : Socket::IPAddress | Nil = nil
			udp_mutex.synchronize do
				message, address = udp_listener.receive
			end
			json = JSON.parse(message.not_nil!)
			if(authenticate(json["user"].to_s, UUID.new(json["api_token"].to_s)).nil?)
				json.as_h.["valid"]=JSON::Any.new false
			else
				json.as_h.["valid"]=JSON::Any.new true
			end
			udp_mutex.synchronize do
				udp_listener.send json.to_json, address.not_nil!
			end
		end
	end
end




post "/login" do |context|
    user = User.from_json context.request.body.not_nil!
	user_file : User
	token : UUID | Nil = nil
	KVStore.access.transaction do |store|
		begin
			user_file = store.fetch! "user/"+user.email
		rescue ex
			halt context, status_code: 403, response: ex.to_s
		end
		if Crypto::Bcrypt::Password.new(user_file.password_hash.not_nil!) == user.password_hash.not_nil!
		else
			halt context, status_code: 403, response: "Invalid password"
		end
		if user_file.tokens.nil?
			user_file.tokens = Array(UUID).new
		end
		token = UUID.random()
		user_file.tokens.not_nil!<<token
		if user_file.tokens.not_nil!.size>5
			user_file.tokens = user_file.tokens.not_nil!.last(5)
		end
		store.push "user/"+user.email, user_file.to_json
	end
    context.response.content_type = "application/json"
    token.not_nil!.to_json
end

get "/logout" do |context|
	user = context.request.headers["user"]
	
	KVStore.access.transaction do |store|
		user_file = store.fetch!("user/"+user)
		user_file.tokens.not_nil!.delete(UUID.new(context.request.headers["api_token"]))
		store.push "user/"+user, user_file.to_json
	end
    context.response.content_type = "application/json"
    "OK".to_json
end

post "/logout-all" do |context|
    user : User
    begin
        user = authenticate!(context.request.headers["user"],UUID.new(context.request.headers["api_token"]))
    rescue ex
        halt context, status_code: 403, response: ex.to_s
	end
	KVStore.access.transaction do |store|
		user_file = store.fetch!("user/"+user.email)
		user_file.tokens=Array(UUID).new
		store.push "user/"+user_file.email, user_file.to_json
	end
    context.response.content_type = "application/json"
    "OK".to_json
end

post "/user" do |context|
    user = User.from_json context.request.body.not_nil!
    ph = user.password_hash
    user.tokens = Array(UUID).new
    user.invoices = Array(Invoice).new
	if ph.nil?
		halt context, status_code: 401, response: "No password provided"
    else
        user.password_hash=Crypto::Bcrypt::Password.create(ph,cost: 12).to_s
    end
    if Statics.email_regex.match(user.email)==nil
		halt context, status_code: 401, response: "Bad email address provided"
    end
	begin
		KVStore.access.transaction do |store|
			if store.fetch("user/"+user.email)!=nil
				raise IndexError.new
			end
			store.push "user/"+user.email, user.to_json
		end
	rescue ex
		halt context, status_code: 401, response: "Email address already in use"
	end
    context.response.content_type = "application/json"
    "OK".to_json
end

get "/user/tokens" do |context|
    user : User
    begin
        user = authenticate!(context.request.headers["user"],UUID.new(context.request.headers["api_token"]))
    rescue ex
        halt context, status_code: 403, response: ex.to_s
    end
    context.response.content_type = "application/json"
    user.tokens.to_json
end

get "/user/authenticate" do |context|
    user : User
    begin
        user = authenticate!(context.request.headers["user"],UUID.new(context.request.headers["api_token"]))
    rescue ex
        halt context, status_code: 403, response: ex.to_s
    end
    context.response.content_type = "application/json"
    "OK".to_json
end

get "/user/address" do |context|
    user : User
    begin
        user = authenticate!(context.request.headers["user"],UUID.new(context.request.headers["api_token"]))
    rescue ex
        halt context, status_code: 403, response: ex.to_s
    end
    context.response.content_type = "application/json"
    user.addresses.to_json
end

post "/user/address" do |context|
    user : User
    begin
        user = authenticate!(context.request.headers["user"],UUID.new(context.request.headers["api_token"]))
    rescue ex
        halt context, status_code: 403, response: ex.to_s
    end
	addresses = Array(Address).from_json(context.request.body.not_nil!).not_nil!
	
	KVStore.access.transaction do |store|
		user_file = store.fetch!("user/"+user.email)
		old_list=user_file.addresses
		if old_list.nil?
		else
			addresses=old_list+addresses
		end
		user_file.addresses=addresses
		store.push "user/"+user_file.email, user_file.to_json
	end
    context.response.content_type = "application/json"
    "OK".to_json
end

delete "/user/address" do |context|
    user = authenticate!(context.request.headers["user"],UUID.new(context.request.headers["api_token"]))
	addresses = Array(Address).from_json(context.request.body.not_nil!).not_nil!
	
	KVStore.access.transaction do |store|
		user_file = store.fetch!("user/"+user.email)
		old_list=user_file.addresses
		if old_list.nil?
			addresses=Array(Address).new
		else
			addresses=old_list.select do |v|
				isin=false
				addresses.each do |va|
						isin |= v==va
				end
				!isin
			end
		end
		user_file.addresses=addresses
		store.push "user/"+user_file.email, user_file.to_json
	end
    context.response.content_type = "application/json"
    "OK".to_json
end

get "/user" do |context|
    context.response.content_type = "application/json"
    user : User | Nil
    begin
		user = authenticate!(context.request.headers["user"],UUID.new(context.request.headers["api_token"]))
	rescue ex
		resp = String::Builder.build do |builder|
			if ENV["KEMAL_ENV"] == "test"
				ex.inspect_with_backtrace builder
			else
				ex.to_s builder 
			end
		end
        halt context, status_code: 403, response: resp
    end
    user.not_nil!
end