///- --package .
:# steps static =
    :< testing

:< sm'_operators
:= walk_away_ms () : i32 = 1300
:= measure_ms () : i32 = 45000

:= step_kind (chasing : bool) (is_knight : bool) (diagonal : bool) (near : bool) : string =
    := base = (? is_knight ?> "knight-" |: "") ++# (? diagonal ?> "diagonal" |: "straight")
    ? chasing && is_knight = !- ?> base ++# (? near ?> "-adjacent" |: "-chasing") |: base

:== step_log = { chasing : bool; stamps : mut (list (i32 * i32 * string)); intervals : mut (list (string * list i32)) }

:== step_seen = { c : client::creature; id : i32; kind : string; o : client::spot; n : client::spot }

:= axis_gap (a : i32) (b : i32) : i32 = ? a > b ?> a - b |: b - a

:= one_tile (n : client::spot) (o : client::spot) : bool =
    := dx, dy = axis_gap n::x o::x, axis_gap n::y o::y
    n::z = o::z && dx + dy <> 0 && dx <= 1 && dy <= 1

:= diagonal_move (n : client::spot) (o : client::spot) : bool = axis_gap n::x o::x = 1 && axis_gap n::y o::y = 1

:= near_player (n : client::spot) : bool = client::player_present () && probe::chebyshev n (client::player_spot ()) <= 1

:= step_head (s : step_seen) : string =
    := name, from, to = client::creature_name s::c, probe::described s::o, probe::described s::n
    name ++# " " ++#? s::id ++# " " ++# s::kind ++# " step " ++# from ++# " -> " ++# to

:= interval_noted (log : step_log) (s : step_seen) (measured : string) (interval : i32) : () =
    samples::labeled_sample log::intervals measured interval
    probe::note (step_head s ++# "; interval after its " ++# measured ++# " step " ++#? interval ++# " ms")

:= step_logged (log : step_log) (s : step_seen) (now : i32) : () =
    := previous_at, measured = samples::last_stamp log::stamps s::id
    samples::stamp log::stamps s::id now s::kind
    ? previous_at >= 0 ?> interval_noted log s measured (now - previous_at)

:= kind_of (log : step_log) (is_knight : bool) (n : client::spot) (o : client::spot) : string =
    step_kind log::chasing is_knight (diagonal_move n o) (near_player n)

:= seen_step
    (log : step_log) (c : client::creature) (is_knight : bool) (n : client::spot) (o : client::spot)
    : step_seen
    =
    := id = client::creature_id c
    { c = c; id = id; kind = kind_of log is_knight n o; o = o; n = n }

:= tile_step (log : step_log) (c : client::creature) (is_knight : bool) (n : client::spot) (o : client::spot) : () =
    := now = client::now_ms ()
    step_logged log (seen_step log c is_knight n o) now

:= creature_moved (log : step_log) (c : client::creature) (n : client::spot) (o : client::spot) : () =
    := is_knight = client::creature_is_local_player c
    ? (client::creature_is_monster c || is_knight) && one_tile n o ?> tile_step log c is_knight n o

:== position = client::native_position

:= record (log : step_log) (c : client::creature) (to : position) (from : position) : () =
    ? client::position_known to && client::position_known from
    ?> creature_moved log c (client::spot_of to) (client::spot_of from)

:= direction_of (n : i32) : i32 = ? n > 0 ?> 1 |? n < 0 ?> -1 |: 0

:= step_from (here : client::spot) (there : client::spot) : () =
    := sx, sy = direction_of (here::x - there::x), direction_of (here::y - there::y)
    ? sx <> 0 || sy <> 0 ?> client::step sx sy |> ignore

:= away_from (here : client::spot) (people : client::crowd) (n : probe::nearest) : () =
    ? client::player_walking () = !- ?> step_from here (client::creature_spot (client::member people n::index))

:= away_from_seen (here : client::spot) (people : client::crowd) (seen : probe::spotted) : () =
    ?= probe::within 2 seen ?|
    | Some n => away_from here people n
    | None => ()

:= away_once () : () =
    := here = client::player_spot ()
    := people = client::spectators here
    away_from_seen here people (probe::nearest_monster here people)

:~ ^ walk_away () : () =
    ? client::player_present () ?>
        away_once ()
        client::after (walk_away_ms ()) walk_away

:= knight_walk_poll_ms () : i32 = 50
:= knight_walk_leg () : i32 = 5

:= poll_later (next : () -> ()) : () = client::after (knight_walk_poll_ms ()) next

:= player_at () : string = probe::described (client::player_spot ())

:= walking_note (waits : i32) : () =
    ? waits % 40 = 39
    ?> probe::note ("knight walk still walking at " ++# player_at () ++# " after " ++#? (waits + 1) ++# " polls")

:= still_walking (waits : i32) (again : () -> ()) : () =
    walking_note waits
    poll_later again

:= stepped_or_noted (dx : i32) : () =
    ? client::step dx 0 = !- ?> probe::note ("knight walk step " ++#? dx ++# " refused at " ++# player_at ())

:= leg_turn (dx : i32) (left : i32) (again : i32 -> i32 -> i32 -> ()) : () =
    ? left = 0 ?> again (0 - dx) (knight_walk_leg ()) 0
    |:
        stepped_or_noted dx
        poll_later \ () => again dx (left - 1) 0

:= walk_stopped () : () = probe::note "knight walk stopped: no player in game"

:~ ^ walk_leg (dx : i32) (left : i32) (waits : i32) : () =
    ? client::player_present () = !- ?> walk_stopped ()
    |? client::player_walking () ?> still_walking waits \ () => walk_leg dx left (waits + 1)
    |: leg_turn dx left walk_leg

:= start_spot () : string = ? client::player_positioned () ?> player_at () |: "nil"

:= walk_start_line () : string =
    := start_at = start_spot ()
    := walking = ? client::player_walking () ?> "yes" |: "no"
    "knight walk starts at " ++# start_at ++# " speed " ++# client::player_speed () ++# " walking " ++# walking

:= walk_back_and_forth () : () =
    probe::note (walk_start_line ())
    walk_leg (0 - 1) (knight_walk_leg ()) 0

///> lua
///> c
:# step_kind_names_knight_and_monster_steps =
    (step_kind !- !+ !- !-, step_kind !+ !+ !+ !+, step_kind !+ !- !- !+)
    |> _assert_eq ("knight-straight", "knight-diagonal", "straight-adjacent")

///> lua
///> c
:# step_kind_names_chasing_and_plain_monster_steps =
    (step_kind !+ !- !+ !-, step_kind !- !- !+ !+) |> _assert_eq ("diagonal-chasing", "diagonal")

///> lua
///> c
:# direction_of_is_the_sign =
    (direction_of 7, direction_of 0, direction_of (0 - 3)) |> _assert_eq (1i32, 0i32, -1i32)

:= fresh_step_log (chasing : bool) : step_log =
    { chasing = chasing; stamps = samples::new_stamps (); intervals = samples::new_labeled_samples () }

:= steps_flags () : bool * bool = client::env_is "TIBIA_STEPS_CHASE" "1", client::env_is "TIBIA_STEPS_KNIGHT_WALK" "1"

:= timed_out () : () = probe::finish "timeout"

:= text_noted (mode : string) (text : string) : () = probe::note (("server text [" ++# mode ++# "]: " ++# text))

:= ready_line () : string =
    := name = client::player_name ()
    := at = start_spot ()
    "in game as " ++# name ++# " at " ++# at ++# " speed " ++# client::player_speed ()

:= measure_end (log : step_log) : () =
    probe::note ("end: " ++# samples::labeled_summary log::intervals)
    probe::finish "steps measured"

:= ready (log : step_log) (walking : bool) : () =
    probe::note (ready_line ())
    ? log::chasing ?> client::after 2000 walk_away
    ? walking ?> client::after 2000 walk_back_and_forth
    client::after (measure_ms ()) \ () => measure_end log

///> _
:= main () =
    := chasing, walking = steps_flags ()
    := log = fresh_step_log chasing
    client::on_position_change (record log)
    probe::started_as (probe::knight ()) text_noted (\ () => ready log walking) 90000 timed_out
    0i32