/*
 * core.h
 *
 *  Created on: 24 Oct 2019
 *      Author: mmalex
 */

#ifndef SRC_CORE_H_
#define SRC_CORE_H_

#include "config.h"
#ifdef EMU
#include <stdint.h>
#ifdef _WIN32
#include <io.h>
#include <Windows.h>
static inline void HAL_Delay(int ms) { Sleep(ms); }
#else // wasm?
static inline void HAL_Delay(int ms) { }
#endif
#endif

#ifdef __APPLE__
#include <unistd.h>
#define _write write
#endif

#include <stdarg.h>
#include <stdio.h>
typedef int8_t s8;
typedef int16_t s16;
typedef int32_t s32;
typedef uint8_t u8;
typedef uint16_t u16;
typedef uint32_t u32;
#ifndef __cplusplus
typedef char bool;
#define true 1
#define false 0
#endif

#define PI 3.141592653589793f

void DebugLog(const char *fmt, ...);
#ifndef EMU
#define EmuDebugLog(...)
static inline u32 millis(void) { return HAL_GetTick(); }
static inline u32 micros(void) { return TIM5->CNT; }
#else
#define EmuDebugLog DebugLog
#endif

static inline int mini(int a,int b) { return (a<b)?a:b; }
static inline int maxi(int a,int b) { return (a>b)?a:b; }
static inline float minf(float a,float b) { return (a<b)?a:b; }
static inline float maxf(float a,float b) { return (a>b)?a:b; }
static inline int clampi(int x, int a, int b) { return mini(maxi(x,a),b); }
static inline float clampf(float x, float a, float b) { return minf(maxf(x,a),b); }
static inline float squaref(float x) { return x*x; }
static inline float lerp(float a, float b, float t){ return a+(b-a)*t; }

static inline u8 triangle(u8 x) {
	return (x < 128) ? x * 2 : (511 - x * 2);
}


static inline float smoothstep01(float x) { return x * x*(3.f - (x + x)); }
static inline float smoothstep(float mn, float mx, float x) { if (x <= mn) return 0.f; if (x >= mx) return 1.f; return smoothstep01((x - mn)*(1.f / (mx - mn))); }

#ifndef EMU
#define likely(x)      __builtin_expect((x), 1)
#define unlikely(x)    __builtin_expect((x), 0)
#else
#define likely(x) (x)
#define unlikely(x) (x)
#endif

static inline void denormals_init(void) {
	// no denormals
#ifndef EMU
	uint32_t fcspr = __get_FPSCR();
	__set_FPSCR(fcspr | (1 << 24));
#endif
}

void DebugLog(const char *fmt, ...);

typedef struct TickCounter {
	uint32_t starttime;
	int total;
	int max;
	int n;
} TickCounter;
#ifdef EMU
#ifdef _WIN32
LARGE_INTEGER pffreq,pfstart;
static inline uint64_t emu_rdtsc(void) {
	LARGE_INTEGER now;
	QueryPerformanceCounter(&now);
	return (((now.QuadPart-pfstart.QuadPart)*80000000) / pffreq.QuadPart);
}
#define RDTSC() emu_rdtsc()
static inline u32 millis(void) { return RDTSC()/80000; }
static inline u32 micros(void) { return RDTSC()/80; }
static inline void tc_init(void) {
	QueryPerformanceFrequency(&pffreq);
	QueryPerformanceCounter(&pfstart);
}
#elif defined(__APPLE__)
#include <mach/mach_time.h>
uint64_t time_start;
mach_timebase_info_data_t timebase_info;
static inline uint64_t emu_rdtsc(void) {
	uint64_t time_now = mach_absolute_time();
	uint64_t time_elapsed = time_now - time_start;
	return (time_elapsed * timebase_info.numer * 80) / (1000 * timebase_info.denom);
}
#define RDTSC() emu_rdtsc()
static inline u32 millis(void) { return RDTSC()/80000; }
static inline u32 micros(void) { return RDTSC()/80; }
static inline void tc_init(void) {
	mach_timebase_info(&timebase_info);
	time_start = mach_absolute_time();
}
#else // wasm
int _millis;
#define RDTSC() (0)
static inline u32 millis(void) { return _millis; }
static inline u32 micros(void) { return _millis*1000; }
static inline void tc_init(void) { }
#endif
#else // hw
#define RDTSC() (DWT->CYCCNT)
static inline void tc_init(void) { 
	DWT->CTRL |= 1 ;
	DWT->CYCCNT = 0; // reset the counter
}
#endif

static inline void tc_start(TickCounter *r) {
	r->starttime = RDTSC();
}
static inline void tc_stop(TickCounter *r) {
	if (!r->starttime)
		return;
	int c=RDTSC() - r->starttime;
	r->n++;
	r->max=maxi(r->max, c);
	r->total+=c;
}
static inline void tc_reset(TickCounter *r) {
	r->total=0;
	r->max=0;
	r->n=0;
}
static inline void tc_log(TickCounter *r, const char *nm) {
	if (!r->n) return;
	TickCounter tc=*r;
	tc_reset(r);
	DebugLog("%s - %d mx:%d %d / ",nm, tc.total/tc.n, tc.max, tc.n);
}

#ifdef IMPL

void DebugLog(const char *fmt, ...) {
#if defined DEBUG || defined _DEBUG
	static bool logging=false;
	if (logging) return;
	logging=true;
#ifndef EMU
	while (huart3.gState != HAL_UART_STATE_READY);
#endif
#ifdef WASM
	va_list args;
	va_start(args, fmt);
	int n = vprintf(fmt, args);
#else
	char buf[256];
	va_list args;
	va_start(args, fmt);
	int n = vsnprintf(buf, sizeof(buf), fmt, args);
	va_end(args);
#ifdef EMU
	_write(1,buf,n);
#else
	//HAL_UART_Transmit_IT(&huart3, (u8*) buf, n);
	HAL_UART_Transmit(&huart3, (u8*) buf, n, 1000);
#endif
#endif
	logging=false;
#endif
}
#endif

#endif /* SRC_CORE_H_ */