require "uuid"
require "uuid/json"

class TodoD
end

class TodoD::List
	enum PermissionLevel
		None = -1
		Read
		Post
		Edit
		Admin

		def to_json(o)
			to_s.downcase.to_json(o)
		end
	end

	JSON.mapping({
		id: String,
		title: String,
		permissions: Hash(String, Array(Int32)),
		extra_properties: Hash(String, JSON::Any),
		tasks: {
			type: Array(String),
			default: [] of String
		}
	})

	def initialize(@title, user, @extra_properties = Hash(String, JSON::Any).new)
		@id = UUID.random.to_s
		@permissions = {
			"admin" => [user.uid],
			"edit" => [] of Int32,
			"post" => [] of Int32,
			"read" => [] of Int32
		}
		@tasks = [] of String
	end

	def users_with_read_permissions : Array(Int32)
		@permissions.map do |level, uids|
			# Would raise on invalid level.
			level = PermissionLevel.parse level

			uids
		end.flatten
	end

	def is_admin?(uid)
		@permissions["admin"].any? &.==(uid)
	end

	def is_editor?(uid)
		@permissions.any? do |level, uids|
			level = PermissionLevel.parse level

			uids.any? do |id|
				id == uid && level >= PermissionLevel::Edit
			end
		end
	end

	def is_reader?(uid)
		@permissions.any? do |level, uids|
			level = PermissionLevel.parse level

			uids.any? do |id|
				id == uid && level >= PermissionLevel::Read
			end
		end
	end

	def set_permission(uid : Int32, level : PermissionLevel)
		@permissions.each &.[1].select!(&.!=(uid))

		return if level.none?

		@permissions[level.to_s].push uid
	end
end

class TodoD::Task
	# Should we hardcode more properties here?
	JSON.mapping({
		id: String,
		list: String,
		title: String,
		description: {
			type: String,
			default: ""
		},
		creator: Int32,
		assigned_to: Int32?,
		priority: String?,
		tags: {
			type: Array(String),
			default: [] of String
		},
		extra_properties: {
			type: Hash(String, JSON::Any),
			default: {} of String => JSON::Any
		}
	})

	def initialize(@list, @title, @creator, @description = "", @assigned_to = nil, @priority = nil, @tags = [] of String, @extra_properties = {} of String => JSON::Any)
		@id = UUID.random.to_s
	end
end