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#include "stdafx.h"

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#include "ttd.h"

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#include "player.h"

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#include "ai.h"

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int AiNew_GetRailDirection(uint tile_a, uint tile_b, uint tile_c) {

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	// 0 = vert

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	// 1 = horz

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	// 2 = dig up-left

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	// 3 = dig down-right

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	// 4 = dig down-left

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	// 5 = dig up-right

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	int x1, x2, x3;

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	int y1, y2, y3;

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	x1 = GET_TILE_X(tile_a);

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	x2 = GET_TILE_X(tile_b);

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	x3 = GET_TILE_X(tile_c);

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	y1 = GET_TILE_Y(tile_a);

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	y2 = GET_TILE_Y(tile_b);

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	y3 = GET_TILE_Y(tile_c);

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	if (y1 == y2 && y2 == y3) return 0;

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	if (x1 == x2 && x2 == x3) return 1;

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	if (y2 > y1) {

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		if (x2 > x3) return 2;

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		else return 4;

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	}

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	if (x2 > x1) {

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		if (y2 > y3) return 2;

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		else return 5;

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	}

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	if (y1 > y2) {

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		if (x2 > x3) return 5;

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		else return 3;

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	}

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	if (x1 > x2) {

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		if (y2 > y3) return 4;

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		else return 3;

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	}

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	return 0;

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}

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int AiNew_GetRoadDirection(uint tile_a, uint tile_b, uint tile_c) {

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	int x1, x2, x3;

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	int y1, y2, y3;

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	int r;

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	x1 = GET_TILE_X(tile_a);

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	x2 = GET_TILE_X(tile_b);

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	x3 = GET_TILE_X(tile_c);

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	y1 = GET_TILE_Y(tile_a);

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	y2 = GET_TILE_Y(tile_b);

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	y3 = GET_TILE_Y(tile_c);

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	r = 0;

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	if (x1 < x2) r += 8;

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	if (y1 < y2) r += 1;

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	if (x1 > x2) r += 2;

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	if (y1 > y2) r += 4;

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	if (x2 < x3) r += 2;

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	if (y2 < y3) r += 4;

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	if (x2 > x3) r += 8;

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	if (y2 > y3) r += 1;

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	return r;

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}

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// Get's the direction between 2 tiles seen from tile_a

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int AiNew_GetDirection(uint tile_a, uint tile_b) {

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	if (GET_TILE_Y(tile_a) < GET_TILE_Y(tile_b)) return 1;

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	if (GET_TILE_Y(tile_a) > GET_TILE_Y(tile_b)) return 3;

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	if (GET_TILE_X(tile_a) < GET_TILE_X(tile_b)) return 2;

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	return 0;

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}

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