/**
 * @file	trigger_structure.h
 *
 * rusEFI defines trigger shape programmatically in C code
 * For integration we have exportAllTriggers export
 *
 * @date Dec 22, 2013
 * @author Andrey Belomutskiy, (c) 2012-2020
 */

#pragma once

#include "state_sequence.h"
#include "generated_lookup_engine_configuration.h"
#include <rusefi/isnan.h>
#include "engine_state.h"

#define FOUR_STROKE_ENGINE_CYCLE 720

#define TRIGGER_GAP_DEVIATION 0.25f
#define TRIGGER_GAP_DEVIATION_LOW (1.0f - TRIGGER_GAP_DEVIATION)
#define TRIGGER_GAP_DEVIATION_HIGH (1.0f + TRIGGER_GAP_DEVIATION)

#if EFI_ENABLE_ASSERTS
#define assertAngleRange(angle, msg, code) if (angle > 10000000 || angle < -10000000) { firmwareError(code, "angle range %s %.2f", msg, angle);angle = 0;}
#else
#define assertAngleRange(angle, msg, code) {UNUSED(code);}
#endif

// Shifts angle into the [0..720) range for four stroke and [0..360) for two stroke
// See also wrapVvt
inline void wrapAngle(angle_t& angle, const char* msg, ObdCode code) {
	if (cisnan(angle)) {
		firmwareError(ObdCode::CUSTOM_ERR_ANGLE, "a NaN %s", msg);
		angle = 0;
	}

	assertAngleRange(angle, msg, code);
	float engineCycle = getEngineState()->engineCycle;

	while (angle < 0) {
		angle += engineCycle;
	}

	while (angle >= engineCycle) {
		angle -= engineCycle;
	}
}

// proper method avoids un-wrapped state of variables
inline angle_t wrapAngleMethod(angle_t param, const char *msg = "", ObdCode code = ObdCode::OBD_PCM_Processor_Fault) {
	wrapAngle(param, msg, code);
	return param;
}

class TriggerDecoderBase;
class TriggerFormDetails;
class TriggerConfiguration;

#include "sync_edge.h"

/**
 * @brief Trigger shape has all the fields needed to describe and decode trigger signal.
 * @see TriggerState for trigger decoder state which works based on this trigger shape model
 */
class TriggerWaveform {
public:
	TriggerWaveform();
	void initializeTriggerWaveform(operation_mode_e triggerOperationMode, const trigger_config_s &triggerType);
	void setShapeDefinitionError(bool value);

	/**
	 * Simplest trigger shape does not require any synchronization - for example if there is only
	 * one primary channel tooth each raising (or falling depending on configuration) front would synchronize
	 */
	bool isSynchronizationNeeded;

	/**
	 * trigger meta information: is second wheel mounted on crank shaft ('false') or cam shaft ('true')
	 */
	bool isSecondWheelCam;
	/**
	 * number of consecutive trigger gaps needed to synchronize
	 */
	int gapTrackingLength = 1;
	/**
	 * special case for triggers which do not provide exact TDC location
	 * For example pick-up in distributor with mechanical ignition firing order control.
	 */
	bool shapeWithoutTdc = false;
	/**
	 * this flag tells us if we should ignore events on second input channel
	 * that's the way to ignore noise from the disconnected wire
	 */
	bool needSecondTriggerInput = false;
	/**
	 * true value here means that we do not have a valid trigger configuration
	 */
	bool shapeDefinitionError = false;

	/**
	 * this variable is incremented after each trigger shape redefinition
	 */
	int version = 0;

	/**
	 * Depending on trigger shape, we use betweeb one and three previous gap ranges to detect synchronizaiton.
	 *
	 * Usually second or third gap is not needed, but some crazy triggers like 36-2-2-2 require two consecutive
	 * gaps ratios to sync
	 */

	float synchronizationRatioFrom[GAP_TRACKING_LENGTH];
	float synchronizationRatioTo[GAP_TRACKING_LENGTH];


	/**
	 * used by NoiselessTriggerDecoder (See TriggerCentral::handleShaftSignal())
	 */
	int syncRatioAvg;


	/**
	 * Trigger indexes within trigger cycle are counted from synchronization point, and all
	 * engine processes are defined in angles from TDC.
	 *
	 * That's the angle distance from trigger event #0 and actual engine TDC
	 *
	 * see also globalTriggerAngleOffset
	 */
	angle_t tdcPosition;

	/**
	 * In case of a multi-channel trigger, do we want to sync based on primary channel only?
	 * See also gapBothDirections
	 */
	bool useOnlyPrimaryForSync;

	// Which edge(s) to consider for finding the sync point: rise, fall, or both
	SyncEdge syncEdge;

	// If true, falling edges should be fully ignored on this trigger shape.
	bool useOnlyRisingEdges;

	void calculateExpectedEventCounts();

	size_t getExpectedEventCount(TriggerWheel channelIndex) const;

	/**
	 * This is used for signal validation
	 */
	size_t expectedEventCount[PWM_PHASE_MAX_WAVE_PER_PWM];

#if EFI_UNIT_TEST
	/**
	 * These signals are used for trigger export only
	 */
	TriggerWheel triggerSignalIndeces[PWM_PHASE_MAX_COUNT];
	TriggerValue triggerSignalStates[PWM_PHASE_MAX_COUNT];
	// see also 'doesTriggerImplyOperationMode'
	// todo: reuse doesTriggerImplyOperationMode instead of separate field only which is only used for metadata anyway?
	bool knownOperationMode = true;
#endif

	/**
	 * wave.phaseCount is total count of shaft events per CAM or CRANK shaft revolution.
	 * TODO this should be migrated to CRANKshaft revolution, this would go together
	 * this variable is public for performance reasons (I want to avoid costs of method if it's not inlined)
	 * but name is supposed to hint at the fact that decoders should not be assigning to it
	 * Please use "getSize()" function to read this value
	 */
	MultiChannelStateSequenceWithData<PWM_PHASE_MAX_COUNT> wave;

	bool isRiseEvent[PWM_PHASE_MAX_COUNT];

	/**
	 * @param angle (0..1]
	 */
	void addEvent(angle_t angle, TriggerValue const state, TriggerWheel const channelIndex = TriggerWheel::T_PRIMARY);
	/* (0..720] angle range
	 * Deprecated! many usages should be replaced by addEvent360
	 */
	void addEvent720(angle_t angle, TriggerValue const state, TriggerWheel const channelIndex = TriggerWheel::T_PRIMARY);

	/**
	 * this method helps us use real world 360 degrees shape for FOUR_STROKE_CAM_SENSOR and FOUR_STROKE_CRANK_SENSOR
	 */
	void addEvent360(angle_t angle, TriggerValue const state, TriggerWheel const channelIndex = TriggerWheel::T_PRIMARY);

	void addToothRiseFall(angle_t angle, angle_t width = 10, TriggerWheel const channelIndex = TriggerWheel::T_PRIMARY);

	/**
	 * This version of the method is best when same wheel could be mounted either on crank or cam
	 *
	 * This version of 'addEvent...' family considers the angle duration of operationMode in this trigger
	 * For example, (0..180] for FOUR_STROKE_SYMMETRICAL_CRANK_SENSOR
	 *
	 * TODO: one day kill all usages with FOUR_STROKE_CAM_SENSOR 720 cycle and add runtime prohibition
	 * TODO: for FOUR_STROKE_CAM_SENSOR addEvent360 is the way to go
	 *
	 * @param angle (0..360] or (0..720] depending on configuration
	 */
	void addEventAngle(angle_t angle, TriggerValue const state, TriggerWheel const channelIndex = TriggerWheel::T_PRIMARY);

	/* (0..720] angle range
	 * Deprecated?
	 */
	void addEventClamped(angle_t angle, TriggerValue const state, TriggerWheel const channelIndex, float filterLeft, float filterRight);
	operation_mode_e getWheelOperationMode() const;

	void initialize(operation_mode_e operationMode, SyncEdge syncEdge);
	void setTriggerSynchronizationGap(float syncRatio);
	void setTriggerSynchronizationGap3(int index, float syncRatioFrom, float syncRatioTo);
	void setTriggerSynchronizationGap2(float syncRatioFrom, float syncRatioTo);
	void setSecondTriggerSynchronizationGap(float syncRatio);
	void setSecondTriggerSynchronizationGap2(float syncRatioFrom, float syncRatioTo);
	void setThirdTriggerSynchronizationGap(float syncRatio);
	/**
	 * this one is per CRANKshaft revolution
	 */
	size_t getLength() const;
	size_t getSize() const;

	int getTriggerWaveformSynchPointIndex() const;

	/**
	 * This private method should only be used to prepare the array of pre-calculated values
	 * See eventAngles array
	 */
	angle_t getAngle(int phaseIndex) const;

	angle_t getCycleDuration() const;

	// Returns true if this trigger alone can fully sync the current engine for sequential mode.
	bool needsDisambiguation() const;

	/**
	 * index of synchronization event within TriggerWaveform
	 * See findTriggerZeroEventIndex()
	 */
	int triggerShapeSynchPointIndex;

	void initializeSyncPoint(
			TriggerDecoderBase& state,
			const TriggerConfiguration& triggerConfiguration
		);

	uint16_t findAngleIndex(TriggerFormDetails *details, angle_t angle) const;

private:
	/**
	 * These angles are in trigger DESCRIPTION coordinates - i.e. the way you add events while declaring trigger shape
	 */
	angle_t getSwitchAngle(int index) const;

	/**
	 * This variable is used to confirm that events are added in the right order.
	 * todo: this variable is probably not needed, could be reimplemented by accessing by index
	 */
	angle_t previousAngle;
	/**
	 * this is part of performance optimization
	 */
	operation_mode_e operationMode;
};

/**
 * Misc values calculated from TriggerWaveform
 */
class TriggerFormDetails {
public:
	void prepareEventAngles(TriggerWaveform *shape);

	/**
	 * These angles are in event coordinates - with synchronization point located at angle zero.
	 * These values are pre-calculated for performance reasons.
	 */
	angle_t eventAngles[2 * PWM_PHASE_MAX_COUNT];
};