/**
 * @file interop_test.c
 * @brief Round-trip test for the galaga boundary, hoststruct.c-style.
 *
 * Links the real script.c and the real galaga.bas -- not copies -- so this
 * fails the moment the boundary and the script disagree. The four claims it
 * pins:
 *
 *  1. The script writes the engine's actor memory: a formation enemy's sway
 *     lands in akgl_Actor.x with no marshalling step.
 *  2. The outbox works: a diving enemy above the player raises FIRE# and the
 *     C side reads it.
 *  3. The boss flips actor state bit 13 at one hit point -- the boundary
 *     crossed engine-ward.
 *  4. Sustained calling holds: 24000 calls through the per-call
 *     akbasic_environment_zero() regime, the load a 40-enemy wave puts on
 *     the runtime in ten seconds.
 *
 * Exit status equals the number of failed claims.
 */

#include <math.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdio.h>
#include <string.h>

#include <akerror.h>

#include <akgl/actor.h>

#include "galaga.h"

#ifndef GALAGA_SCRIPT_PATH
#define GALAGA_SCRIPT_PATH "galaga.bas"
#endif

/* script.c reads these; main.c usually defines them. This test is the host. */
galaga_Game galaga_game;
galaga_Shared galaga_shared;

static int FAILURES = 0;

#define CLAIM(__cond, __text)						\
    if ( !(__cond) ) {							\
	fprintf(stderr, "FAILED: %s\n", __text);			\
	FAILURES += 1;							\
    } else {								\
	printf("ok: %s\n", __text);					\
    }

static akerr_ErrorContext *run_claims(void)
{
    galaga_Enemy enemy;
    akgl_Actor actor;
    int i = 0;
    PREPARE_ERROR(errctx);

    PASS(errctx, galaga_script_boot((char *)GALAGA_SCRIPT_PATH));

    /* --- 1: formation sway lands in the actor ---------------------------- */
    memset(&enemy, 0, sizeof(enemy));
    memset(&actor, 0, sizeof(actor));
    enemy.kind = GALAGA_ENEMY_BEE;
    enemy.state = GALAGA_ES_FORMATION;
    enemy.homex = 400.0f;
    enemy.homey = 300.0f;
    enemy.hp = 1;
    actor.x = 0.0f;
    actor.y = 0.0f;
    PASS(errctx, galaga_script_update_enemy(&enemy, &actor, 0.016f));
    CLAIM((fabsf(actor.x - enemy.homex) <= 16.5f) && (actor.y == enemy.homey),
	  "a formation bee's sway is written into akgl_Actor.x/y by the script");

    /* --- 2: the fire outbox ---------------------------------------------- */
    memset(&enemy, 0, sizeof(enemy));
    memset(&actor, 0, sizeof(actor));
    enemy.kind = GALAGA_ENEMY_BEE;
    enemy.state = GALAGA_ES_DIVING;
    enemy.rnd = 0.0f;			/* 0.0 < DT% * 1.5: always willing */
    actor.x = 600.0f;
    actor.y = 200.0f;
    galaga_shared.playerx = 610.0f;	/* just off the shot's column      */
    galaga_shared.playery = 860.0f;	/* well below                      */
    PASS(errctx, galaga_script_update_enemy(&enemy, &actor, 0.016f));
    CLAIM(enemy.fire == 1,
	  "a diving bee above the player raises FIRE# for the engine to consume");

    /* --- 3: the boss's hurt bit ------------------------------------------ */
    memset(&enemy, 0, sizeof(enemy));
    memset(&actor, 0, sizeof(actor));
    enemy.kind = GALAGA_ENEMY_BOSS;
    enemy.state = GALAGA_ES_FORMATION;
    enemy.homex = 500.0f;
    enemy.homey = 120.0f;
    enemy.hp = 1;
    actor.state = AKGL_ACTOR_STATE_ALIVE;
    PASS(errctx, galaga_script_update_enemy(&enemy, &actor, 0.016f));
    CLAIM((actor.state & AKGL_ACTOR_STATE_UNDEFINED_13) != 0,
	  "a boss at one hit point raises actor state bit 13 from BASIC");

    /* --- 4: sustained calling --------------------------------------------- */
    memset(&enemy, 0, sizeof(enemy));
    memset(&actor, 0, sizeof(actor));
    enemy.kind = GALAGA_ENEMY_BEE;
    enemy.state = GALAGA_ES_FORMATION;
    enemy.homex = 400.0f;
    enemy.homey = 300.0f;
    for ( i = 0; i < 24000; i++ ) {
	enemy.rnd = 0.9f;		/* never dive: keep the state put */
	PASS(errctx, galaga_script_update_enemy(&enemy, &actor, 0.016f));
    }
    CLAIM(galaga_game.script_errors == 0,
	  "24000 calls survive the per-call akbasic_environment_zero() regime");
    SUCCEED_RETURN(errctx);
}

int main(void)
{
    PREPARE_ERROR(errctx);

    ATTEMPT {
	CATCH(errctx, run_claims());
    } CLEANUP {
    } PROCESS(errctx) {
    } HANDLE_DEFAULT(errctx) {
	LOG_ERROR_WITH_MESSAGE(errctx, "the interop test could not run");
	FAILURES += 1;
    } FINISH_NORETURN(errctx);

    return FAILURES;
}