indexing
    description: "Dragon actors"
    author: "Remlie Ortencio"
    date: "13-10-2012"
    last_modified: "13-10-2012"

class
    DRAGON

inherit
    HOBBIT_ACTOR
        redefine
            make, act
        end

create {HOBBIT_OBJECT_FACTORY} -- a DRAGON can only be created by a
                               -- HOBBIT_OBJECT_FACTORY
    make

feature{NONE} -- private attributes

    sleeping: BOOLEAN -- check on whether dragon is awake or asleep
    hoard_location: LOCATION -- records where dragon's hoard is to allow it to return
    travel_direction: INTEGER -- index into directions
    next_location: LOCATION -- where the dragon is to move next
    attack_command: ATTACK_COMMAND -- our own private attack command, which we will not make visible to others

feature{NONE} -- creation
    make(new_name: STRING; new_description: STRING; the_simulation: HOBBIT_SIMULATION) is
        local
            weapon: OBJECT
            take_command: TAKE_COMMAND
        do
            precursor(new_name, new_description, the_simulation)

            -- give the dragon an "active attack" command, which it will use to attack other actors it encounters
            -- this is different from the "passive" attack commands that all HOBBIT_ACTOR actors have, that allows them to be attacked
            create attack_command.make ("active attack", "<actor>")
            attack_command.set_actor(current)

            -- Give the dragon jaws of fire, as blasting actors with fire is what they do best
            -- Handled this way for simplicity, will need to handle deletion of weapon upon defeat (if ever possible, assumed immortal from currently implemented attacks)
            weapon := simulation.object_factory.create_object(new_name + "'s Jaws of Fire", "the dragon's source of deathly hot flames")
            weapon.set_symbol('') -- research on what this means and what symbol to use
            create take_command.make("take", "<object>")
            take_command.set_object(weapon)
            weapon.add_command(take_command)
            weapon.set_points(999,999) -- assuming this is damage points, research required
            take_command.set_actor(current)
            take_command.execute -- doing it this way ensures that house-keeping is done

            -- initialize behaviour
            sleeping := TRUE -- sleeps and does nothing until it wakes
        end -- make

feature -- game action
    act is
            -- the Dragon behaviour for The Hobbit game
        require else
            valid_location: location /= void -- the location must be set before the first call to act, as this defines the dragon's hoard's location
        local
            wake_chance: INTEGER -- holds a value between 1 to 10 to determine when dragon wakes
        do
            -- ### Initial Behaviour
            if hoard_location = void then
                hoard_location := location -- set the hoard location on the first call to act
            end

            if sleeping = TRUE then
                -- Dragon is still asleep
                -- code to wake up dragon at a 10% chance here
                wake_chance := simulation.random_generator.random_value_from_range(1, 10)
                if wake_chance = 1 then
                    sleeping := FALSE
                    simulation.interface.put_message(name + " has woken up!")
                    set_up_travel -- decides where to go upon waking
                end -- inner if
            else
                move
                if location = hoard_location then
                    sleeping := TRUE
                else
                    attack
                end -- else if
            end -- outer if
        end -- act

feature{NONE} -- private meathods
    set_up_travel is
            -- method to decide where the dragon will move to next
        local
            location_check: LOCATION
        do
            travel_direction := simulation.random_generator.random_value_from_range(directions.lower, directions.upper)
            location_check := location.get_path(directions.item(travel_direction))
            if location_check = void then
                set_up_travel -- should call itself until a valid direction is found, for when dragon is sleeping at edge of grid
            end
        end -- set_up_travel

    move is
            -- handles dragon moving from hoard and back
            -- navigation used to return to hoard here is the same as the method used in the REPLICATOR class
            -- this form of navigation is used in case dragon encounters water (while unlikely, used just in case)
            -- Note: does not handle if dragon is moving against water current
        local
            next_location: LOCATION
            current_direction: INTEGER
        do
            if location /= hoard_location then
                from
                    current_direction := directions.lower
                until
                    current_direction >= directions.upper
                loop
                    next_location := get_closer_location(current_target.location, next_location, location.get_path(directions.item(current_direction)))
                    current_direction := current_direction + 1
                end -- loop
            else
                next_location := location.get_path(directions.item(travel_direction))
            end
            set_location(next_location)
        end -- move

    attack is
            -- handles dragon attacking when it finds visible actor(s) in the area it is currently in
    local
        obj_list: LINKED_LIST[STRING]
        obj: OBJECT
        attack_obj_list: LINKED_LIST[STRING]
        number_of_attack_areas: INTEGER
        attack_command : ATTACK_COMMAND
    do
        obj_list := location.list_contents
        if obj_list /= void then
            from
                obj_list.start
            until
                obj_list.off
            loop
                obj := location.get_contents(object_name_from_list_entry(obj_list.item))
                if obj.team_id /= simulation.default_team_id and obj.team_id /= team_id then
                    if obj.has_command("attack") then
                        -- we have found something to attack
                        -- replace following code with code to attack all actors in the area, invisible or not
                        attack_command ?= obj.get_command("attack")
                        if attack_command /= void then
                            attack_command.set_actor(obj)
                            attack_command.execute
                            attack_command.set_actor(void)
                        end
                    emd
                    simulation.interface.put_message("An attack has been launched! " + name + weapon.get_name + " damages everyone in the area!")
                    number_of_attack_areas := 1 -- fixed assuming there is 9 areas, one in each of the 8 directions and the current area
                    from
                        number_of_attack_areas = 1
                    until
                        number_of_attack_areas = 9
                    loop

                    end
                end -- if
                obj_list.forth
            end -- loop
        end -- if
    end -- attack

    -- TODO:
    -- Make Dragon sleep with 10% chance of waking
    -- When awake, make it move in one random direction, then check if actor can be seen in the area the dragon moved to
    -- if visible actor exists, then attack, which also damages all actors in the area and all adjacent areas
    -- after moving/attacking, go back to hoard
    -- add treasure objects (look at hobbit_application object_factory)
end