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#ifndef WORLD_HOSE_H
#define WORLD_HOSE_H

/*
 * Garden hoses as a rope: a chain of points from the tap to the nozzle that
 * falls, lies on the ground, and drapes over and round whatever is in the way
 * (never through it). The length is fixed; pulled straight it goes taut.
 *
 * Too near a burning fire it gets hot, melts (it leaks there) and burns
 * through (nothing comes out at the nozzle; the water runs out at the break).
 * Duct tape mends a melted spot; a burnt-through bit is cut out with the
 * shears and the ends joined: the hose is that much shorter.
 */

#include "world/object.h"
#include "render/renderer.h"

#define HOSE_LENGTH 25.0f  /* meters of hose from the tap */
#define HOSE_NODES  51     /* points along it (half a meter apart) */
#define HOSE_MAX    4      /* hoses simulated at once */

#define HOSE_LEAKS  0.35f  /* melted this far (0..1) it leaks; 1: burned through */

typedef struct {
    const Object *nozzle;
    Vec3  p[HOSE_NODES], prev[HOSE_NODES];
    float melt[HOSE_NODES];   /* how far each bit is melted (1: burned through, between it and the next) */
    float heat[HOSE_NODES];   /* how hot it is right now (0..1): it glows */
    bool  taped[HOSE_NODES];  /* mended with duct tape */
    float length;             /* meters (shorter once a bit is cut out) */
    bool  ready;
} HoseRope;

struct World;

/* Lets every hose fall, settle and slide round things (real seconds). */
void Hose_update(struct World *world, float dt);

/* Draws the hose of this nozzle, piece by piece. */
void Hose_draw(struct World *world, Renderer *renderer, const Object *nozzle);

/* The hose of this nozzle (NULL if it has none). */
HoseRope *Hose_of(struct World *world, const Object *nozzle);
/* How far it reaches from the tap (meters; shorter once mended). */
float Hose_length(struct World *world, const Object *nozzle);
/* Burned through somewhere (*at: where). */
bool  Hose_burnedThrough(struct World *world, const Object *nozzle, Vec3 *at);
/* Turned on for dt: how much of the water gets to the nozzle (0..1). Where it
   leaks or is burned through the water runs out onto the ground. */
float Hose_flow(struct World *world, const Object *nozzle, float dt);
/* The bit of any hose along a ray (within reach): its rope and node, or NULL. */
HoseRope *Hose_aimed(struct World *world, Vec3 eye, Vec3 dir, float reach, int *node);
/* The worst spot near node k: melted (or burned through) bits around it, or -1. */
int   Hose_damageNear(const HoseRope *rope, int k);
/* Duct tape round the melted bits at spot k: no more leaking there. False if
   burned through (tape won't hold that) or nothing to mend. */
bool  Hose_tape(HoseRope *rope, int k);
/* Cuts out the melted bits at spot k and joins the ends. Meters it got shorter (0: nothing cut). */
float Hose_cutOut(HoseRope *rope, int k);

#endif /* WORLD_HOSE_H */