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//==============================================================================
// func_train
//==============================================================================

//======================================================================
// constants
//======================================================================

const float TRAIN_RETRIGGER = 1;
const float TRAIN_MOVEONTRIGGER = 2;
const float TRAIN_STOPONTRIGGER = 4;
const float TRAIN_NONSOLID = 8;
const float TRAIN_NOROTATE = 16;
const float TRAIN_ROTATEY = 32;
const float TRAIN_CUSTOMALIGN = 64;

const float TRAIN_NEXT_WAIT = 0;        // normal movement
const float TRAIN_NEXT_STOP = 1;        // force a stop on the next path_corner
const float TRAIN_NEXT_CONTINUE = 2;    // force continue on the next
                                        // path_corner (ignores wait time)

//======================================================================
// forward declarations
//======================================================================

// base_func_train
void() base_func_train_blocked;
void() base_func_train_use_stopped;
void() base_func_train_use_moving;
void() base_func_train_wait;
void() base_func_train_next;
void() base_func_train_find;
void(entity e) base_func_train_init;
strip void() base_func_train;

// func_train
void(entity e) func_train_init;
void() func_train;

//------------------------------------------------------------------------------

//----------------------------------------------------------------------
// class base_func_train: base_func
// {
        //--------------------------------------------------------------
        void() base_func_train_blocked =
        {
                // don't block on projectiles -- CEV
                if (other.classgroup & CG_PROJECTILE)
                {
                        if (other.mins != '0 0 0' || other.maxs != '0 0 0')
                                setsize (other, '0 0 0', '0 0 0');

                        return;
                }

                if (time < self.attack_finished)
                        return;

                self.attack_finished = time + 0.5;
                t_damage2 (other, self, self, self.dmg);
        };

        //--------------------------------------------------------------
        // Use function for when the train is stopped.
        // Makes the train continue on path_corners with wait -1,
        // or forces a continue if the "move on trigger" spawnflag is set.
        //--------------------------------------------------------------
        void() base_func_train_use_stopped =
        {
                if (self.spawnflags & TRAIN_MOVEONTRIGGER || self.wait < 0)
                {
                        base_func_train_next ();
                        return;
                }

                // Train has already moved after startup, and has no
                // "stop on trigger" flag, so ignore activation.
                if (self.think != base_func_train_find &&
                        self.cnt != TRAIN_NEXT_STOP)
                {
                        return;
                }

                base_func_train_next ();
        };

        //--------------------------------------------------------------
        // Use function for when the train is moving.
        // Forces a stop or an instant continue on the next path_corner
        // depending on the spawnflag set
        //--------------------------------------------------------------
        void() base_func_train_use_moving =
        {
                if (self.spawnflags & TRAIN_MOVEONTRIGGER || self.wait < 0)
                        self.cnt = TRAIN_NEXT_CONTINUE;
                else if (self.spawnflags & TRAIN_STOPONTRIGGER)
                        self.cnt = TRAIN_NEXT_STOP;
        };

        //--------------------------------------------------------------
        // path_corner has been reached, so decide what to do next
        //--------------------------------------------------------------
        void() base_func_train_wait =
        {
                local float localtime;

                if (self.movetype == MOVETYPE_PUSH)
                        localtime = self.ltime;
                else
                        localtime = time;

                // ready to be re-triggered
                self.use = base_func_train_use_stopped;

                // from Copper
                // Trains now fire their path_corners' targets on arrival.
                // If a player is riding the train, treat them as activator.
                activator = nextent (world);

                while (!func_door_entities_touching(self, activator) &&
                        activator.classtype == CT_PLAYER)
                {
                        activator = nextent (activator);
                }

                if (activator.classtype != CT_PLAYER)
                        // default to player1 wherever they are
                        activator = nextent (world);

                // was SUB_UseEntTargets -- CEV
                sub_runvoidas (self.enemy, sub_usetargets);

                if (self.enemy.speed)
                        // sets the speed from the current path_corner
                        self.speed2 = self.enemy.speed;

                // oof. -- CEV
                if (self.classtype == CT_MISC_MODELTRAIN)
                {
                        if (self.enemy.first_frame)
                                self.first_frame = self.enemy.first_frame;
                        if (self.enemy.last_frame)
                                self.last_frame = self.enemy.last_frame;
                        if (self.enemy.first_frame2)
                                self.first_frame2 = self.enemy.first_frame2;
                        if (self.enemy.last_frame2)
                                self.last_frame2 = self.enemy.last_frame2;
                        if (self.enemy.frtime)
                                self.frtime = self.enemy.frtime;
                        if (self.enemy.frtime2)
                                self.frtime2 = self.enemy.frtime2;
                        if (self.enemy.animtype)
                                self.animtype = self.enemy.animtype;
                        if (self.enemy.animtype2)
                                self.animtype2 = self.enemy.animtype2;
                        if (self.enemy.multiplier)
                                self.multiplier = self.enemy.multiplier;
                }

                self.think = base_func_train_next;

                // train is moving normally and path_corner has a wait set,
                // so pause for that time.
                if (self.wait > 0 && self.cnt == TRAIN_NEXT_WAIT &&
                        !(self.spawnflags & TRAIN_RETRIGGER))
                {
                        // state: stopped
                        self.state = 0;

                        // oof -- CEV
                        if (self.classtype == CT_MISC_MODELTRAIN)
                        {
                                sub_runvoidas (self.animcontroller,
                                        self.animcontroller.think);
                        }

                        self.nextthink = localtime + self.wait;

                        // play stopping sound. If path_corner has a custom
                        // sound, play that instead
                        if (self.enemy.noise != "")
                                sound (self, CHAN_WEAPON, self.enemy.noise,
                                        1, ATTN_NORM);
                        else
                                sound (self, CHAN_VOICE, self.noise,
                                        1, ATTN_NORM);
                }
                // train is moving normally and path_corner has no wait time,
                // or has been forced to move instantly through a triggering.
                else if (self.cnt != TRAIN_NEXT_STOP && !self.wait &&
                        !(self.spawnflags & TRAIN_RETRIGGER))
                {
                        // play "passing by" sound, if any. If path_corner has
                        // a custom one, play that instead
                        if (self.enemy.noise2 != "")
                                sound (self, CHAN_WEAPON, self.enemy.noise2,
                                        1, ATTN_NORM);
                        else if (self.noise2 != "")
                                sound (self, CHAN_WEAPON, self.noise2,
                                        1, ATTN_NORM);

                        // move instantly
                        self.nextthink = -1;
                        base_func_train_next ();
                }
                // path_corner has wait -1, or train has been forced to stop
                // through a triggering. Also catches the backwards compatible
                // case for the original rubicon2 "retrigger" flag.
                else
                {
                        // play stopping sound. If path_corner has a custom
                        // sound, play that instead
                        if (self.enemy.noise != "")
                                sound (self, CHAN_WEAPON, self.enemy.noise,
                                        1, ATTN_NORM);
                        else
                                sound (self, CHAN_VOICE, self.noise,
                                        1, ATTN_NORM);

                        // state: stopped
                        self.state = 0;

                        // oof -- CEV
                        if (self.classtype == CT_MISC_MODELTRAIN)
                        {
                                sub_runvoidas (self.animcontroller,
                                        self.animcontroller.think);
                        }

                        self.nextthink = -1;
                }
        };

        //--------------------------------------------------------------
        // searches for the next path_corner and sends the train on its way
        //--------------------------------------------------------------
        void() base_func_train_next =
        {
                local entity targ;
                local vector destang = '0 0 0';
                local vector displ = '0 0 0';

                targ = find (world, targetname, self.target);

                if (!targ || self.target == "")
                        objerror ("train_next: no next target");

                self.target = targ.target;

                if (targ.wait)
                {
                        // get the wait time from the upcoming path_corner

                        // wait -2 on the path_corner forces it to continue
                        // moving (no wait), even if the train has a default
                        // wait time
                        if (targ.wait == -2)
                                self.wait = 0;
                        else
                                self.wait = targ.wait;
                }
                else
                {
                        // use train's current wait time otherwise
                        self.wait = self.pausetime;
                }

                self.enemy = targ;

                sound (self, CHAN_VOICE, self.noise1, 1, ATTN_NORM);

                if (!(!self.wait && self.cnt == TRAIN_NEXT_CONTINUE))
                        self.cnt = TRAIN_NEXT_WAIT;

                // store up any premature triggerings until current
                // movement is finished
                self.use = base_func_train_use_moving;

                // oof -- CEV
                if (self.classtype == CT_MISC_MODELTRAIN)
                {
                        if (!(self.spawnflags & TRAIN_NOROTATE))
                        {
                                destang = vectoangles (
                                        targ.origin - self.origin);

                                if (self.spawnflags & TRAIN_ROTATEY)
                                {
                                        destang_x = self.angles_x;
                                        destang_z = self.angles_z;
                                }

                                if (self.multiplier > 0)
                                {
                                        // TODO CEV
                                        sub_calcanglemovecontroller (self,
                                                destang,
                                                self.speed2 * self.multiplier,
                                                sub_null,
                                                self.rotatecontroller);
                                }
                                else
                                {
                                        self.angles = destang;
                                }
                        }
                }

                if (!self.state)
                {
                        self.state = 1;

                        if (self.classtype == CT_MISC_MODELTRAIN &&
                                self.style != TRAIN_STYLE_SINGLEANIM)
                        {
                                sub_runvoidas (self.animcontroller,
                                        self.animcontroller.think);
                        }
                }

                // if the TRAIN_CUSTOMALIGN flag is checked then the train
                // should align with its path_corners based on the location
                // of an "origin" brush added to the train by the mapper
                // instead of the mins corner -therektafire
                local float do_displace;
                if (self.spawnflags & TRAIN_CUSTOMALIGN)
                        do_displace = 0.0;
                else
                        do_displace = 1.0;

                if (self.classtype != CT_MISC_MODELTRAIN)
                        displ = self.mins;

                sub_calcmove (self, targ.origin - (displ * do_displace),
                        self.speed2, base_func_train_wait);
        };

        //--------------------------------------------------------------
        // searches for the first path_corner after the train entity is
        // initialized
        //--------------------------------------------------------------
        void() base_func_train_find =
        {
                local entity targ;
                local float localtime;
                local vector displ = '0 0 0';

                if (self.movetype == MOVETYPE_PUSH)
                        localtime = self.ltime;
                else
                        localtime = time;

                targ = find (world, targetname, self.target);
                self.target = targ.target;

                local float do_displace;
                if (self.spawnflags & TRAIN_CUSTOMALIGN)
                        do_displace = 0.0;
                else
                        do_displace = 1.0;

                if (self.classtype != CT_MISC_MODELTRAIN)
                        displ = self.mins;

                self.enemy = targ;
                setorigin (self, targ.origin - (displ * do_displace));
                if (targ.speed)
                        // uses speed from the 1st path corner if set
                        self.speed2 = targ.speed;

                if (!self.targetname)
                {
                        // not triggered, so start immediately
                        self.think = base_func_train_next;
                        self.nextthink = localtime + 0.1;
                }
        };

        //--------------------------------------------------------------
        void(entity e) base_func_train_init =
        {
                base_func_init (e);

                if (!e.speed)
                        e.speed = 100;
                if (!e.target)
                        objerror ("base_func_train_init: no target\n");
                if (!e.dmg)
                        e.dmg = 2;

                if (e.spawnflags & TRAIN_STOPONTRIGGER &&
                        e.spawnflags & TRAIN_MOVEONTRIGGER)
                {
                        objerror ("base_func_train_init: Stop and move on "
                                "trigger set at the same time\n");
                }

                if (e.sounds == 1)
                {
                        if (e.noise == "")
                                e.noise = "plats/train2.wav";
                        if (e.noise1 == "")
                                e.noise1 = "plats/train1.wav";
                }
                else if (e.sounds == 2)
                {
                        // base door sound
                        if (e.noise == "")
                                e.noise = "doors/hydro2.wav";
                        if (e.noise1 == "")
                                e.noise1 = "doors/hydro1.wav";
                }
                else
                {
                        if (e.noise == "")
                                e.noise = "misc/null.wav";
                        if (e.noise1 == "")
                                e.noise1 = "misc/null.wav";
                }

                // backwards compatibility with previous version
                if (e.noise3 != "")
                        e.noise = e.noise3;
                if (e.noise4 != "")
                        e.noise1 = e.noise4;

                precache_sound (e.noise);
                precache_sound (e.noise1);
                if (e.noise2 != "")
                        precache_sound (e.noise2);

                e.cnt = TRAIN_NEXT_WAIT;

                if (e.spawnflags & TRAIN_NONSOLID)
                {
                        e.solid = SOLID_NOT;
                        e.movetype = MOVETYPE_NOCLIP;
                }
                else
                {
                        e.solid = SOLID_BSP;
                        e.movetype = MOVETYPE_PUSH;
                }

                e.blocked = base_func_train_blocked;
                e.use = base_func_train_use_stopped;

                setmodel (e, e.model);
                setsize (e, e.mins , e.maxs);
                setorigin (e, e.origin);

                e.speed2 = e.speed;

                // start trains on the second frame, to make sure their
                // targets have had a chance to spawn

                e.think = base_func_train_find;

                if (e.movetype == MOVETYPE_PUSH)
                        e.nextthink = e.ltime + 0.1;
                else
                        e.nextthink = time + 0.1;
        };

        //--------------------------------------------------------------
        strip void() base_func_train =
        {
                base_func_train_init (self);
        };
// };

/*QUAKED func_train (0 .5 .8) ? RETRIGGER
Trains are moving platforms that players can ride.
The targets origin specifies the min point of the train at each corner.
The train spawns at the first target it is pointing at.
If the train is the target of a button or trigger, it will not begin moving until activated.

RETRIGGER: stop at each path_corner and don't resume until triggered again (ignores wait time)

speed   default 100
dmg             default 2
sounds
1) ratchet metal
2) base

*/
//----------------------------------------------------------------------
// class func_train: base_func_train
// {
        //--------------------------------------------------------------
        void(entity e) func_train_init =
        {
                e.classname = "func_train";
                e.classtype = CT_FUNC_TRAIN;

                base_func_train_init (e);
        };

        //--------------------------------------------------------------
        void() func_train =
        {
                // new spawnflags for all entities -- iw
                if (SUB_Inhibit())
                        return;

                func_train_init (self);
        };
// };