/*
 *  nextpnr -- Next Generation Place and Route
 *
 *  Copyright (C) 2018  Clifford Wolf <clifford@clifford.at>
 *
 *  Permission to use, copy, modify, and/or distribute this software for any
 *  purpose with or without fee is hereby granted, provided that the above
 *  copyright notice and this permission notice appear in all copies.
 *
 *  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 *  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 *  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 *  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 *  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 *  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 *  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 */

#include "design.h"

#ifndef CHIP_H
#define CHIP_H

struct DelayInfo
{
	float delay = 0;

	float raiseDelay() { return delay; }
	float fallDelay() { return delay; }
};

typedef IdString BelType;
typedef IdString PortPin;

static inline IdString belTypeToId(BelType type) { return type; }
static inline IdString portPinToId(PortPin type) { return type; }

static inline BelType belTypeFromId(IdString id) { return id; }
static inline PortPin portPinFromId(IdString id) { return id; }

struct BelId
{
	uint8_t tile_x = 0, tile_y = 0;
	uint16_t index = 0;

	bool nil() const {
		return !tile_x && !tile_y && !index;
	}
} __attribute__((packed));

struct WireId
{
	uint8_t tile_x = 0, tile_y = 0;
	uint16_t index = 0;

	bool nil() const {
		return !tile_x && !tile_y && !index;
	}
} __attribute__((packed));

namespace std
{
	template<> struct hash<BelId>
        {
		std::size_t operator()(const BelId &bel) const noexcept
		{
			std::size_t result = std::hash<int>{}(bel.index);
			result ^= std::hash<int>{}(bel.tile_x) + 0x9e3779b9 + (result << 6) + (result >> 2);
			result ^= std::hash<int>{}(bel.tile_y) + 0x9e3779b9 + (result << 6) + (result >> 2);
			return result;
		}
	};

	template<> struct hash<WireId>
        {
		std::size_t operator()(const WireId &wire) const noexcept
		{
			std::size_t result = std::hash<int>{}(wire.index);
			result ^= std::hash<int>{}(wire.tile_x) + 0x9e3779b9 + (result << 6) + (result >> 2);
			result ^= std::hash<int>{}(wire.tile_y) + 0x9e3779b9 + (result << 6) + (result >> 2);
			return result;
		}
	};
}

struct BelIterator
{
	BelId *ptr = nullptr;

	void operator++() { ptr++; }
	bool operator!=(const BelIterator &other) const { return ptr != other.ptr; }
	BelId operator*() const { return *ptr; }
};

struct BelRange
{
	BelIterator b, e;
	BelIterator begin() const { return b; }
	BelIterator end() const { return e; }
};

struct WireIterator
{
	WireId *ptr = nullptr;

	void operator++() { ptr++; }
	bool operator!=(const WireIterator &other) const { return ptr != other.ptr; }
	WireId operator*() const { return *ptr; }
};

struct WireRange
{
	WireIterator b, e;
	WireIterator begin() const { return b; }
	WireIterator end() const { return e; }
};

struct WireDelay
{
	WireId wire;
	DelayInfo delay;
};

struct WireDelayIterator
{
	WireDelay *ptr = nullptr;

	void operator++() { ptr++; }
	bool operator!=(const WireDelayIterator &other) const { return ptr != other.ptr; }
	WireDelay operator*() const { return *ptr; }
};

struct WireDelayRange
{
	WireDelayIterator b, e;
	WireDelayIterator begin() const { return b; }
	WireDelayIterator end() const { return e; }
};

struct BelPin
{
	BelId bel;
	PortPin pin;
};

struct BelPinIterator
{
	BelPin *ptr = nullptr;

	void operator++() { ptr++; }
	bool operator!=(const BelPinIterator &other) const { return ptr != other.ptr; }
	BelPin operator*() const { return *ptr; }
};

struct BelPinRange
{
	BelPinIterator b, e;
	BelPinIterator begin() const { return b; }
	BelPinIterator end() const { return e; }
};

struct GuiLine
{
	float x1, y1, x2, y2;
};

struct ChipArgs
{
	// ...
};

struct Chip
{
	// ...

	Chip(ChipArgs args);

	void setBelActive(BelId bel, bool active);
	bool getBelActive(BelId bel);

	BelId getBelByName(IdString name) const;
	WireId getWireByName(IdString name) const;
	IdString getBelName(BelId bel) const;
	IdString getWireName(WireId wire) const;

	BelRange getBels() const;
	BelRange getBelsByType(BelType type) const;
	BelType getBelType(BelId bel) const;

	void getBelPosition(BelId bel, float &x, float &y) const;
	void getWirePosition(WireId wire, float &x, float &y) const;
	vector<GuiLine> getBelGuiLines(BelId bel) const;
	vector<GuiLine> getWireGuiLines(WireId wire) const;

	WireRange getWires() const;
	WireDelayRange getWiresUphill(WireId wire) const;
	WireDelayRange getWiresDownhill(WireId wire) const;
	WireDelayRange getWiresBidir(WireId wire) const;
	WireDelayRange getWireAliases(WireId wire) const;

	// the following will only operate on / return "active" BELs
	// multiple active uphill BELs for a wire will cause a runtime error
	WireId getWireBelPin(BelId bel, PortPin pin) const;
	BelPin getBelPinUphill(WireId wire) const;
	BelPinRange getBelPinsDownhill(WireId wire) const;
};

#endif