/*
 * lib.c - Parse Eeschema .lib file
 *
 * Written 2016 by Werner Almesberger
 * Copyright 2016 by Werner Almesberger
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */


#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <math.h>
#include <assert.h>

#include "util.h"
#include "misc.h"
#include "style.h"
#include "fig.h"
#include "text.h"
#include "lib.h"


enum text_style {
	text_normal,
};

struct obj {
	enum obj_type {
		obj_poly,
		obj_rect,
		obj_circ,
		obj_arc,
		obj_text,
		obj_pin,
	} type;
	unsigned unit;
	unsigned convert;
	union {
		struct poly_obj {
			int thick;
			char fill;
			int points;
			int *x;
			int *y;
		} poly;
		struct rect_obj {
			int thick;
			char fill;
			int sx, sy;
			int ex, ey;
		} rect;
		struct circ_obj {
			int x, y;
			int r;
			int thick;
			char fill;
		} circ;
		struct arc_obj {
			int x, y;
			int r;
			int start_a, end_a;
			int thick;
			char fill;
		} arc;
		struct text_obj {
			int orient;
			int x, y;
			int dim;
			char *s;
			enum text_style style;
			char hor_align;
			char vert_align;
		} text;
		struct pin_obj {
			char *name;
			char *number;
			int x, y;
			int length;
			char orient;
			int number_size;
			int name_size;
			char etype;
			// @@@ shape
		} pin;
	} u;
	struct obj *next;
};


/* ----- Drawing ----------------------------------------------------------- */


static struct comp *comps = NULL;
static struct comp *curr_comp; /* current component */
static struct comp **next_comp = &comps;
static struct obj **next_obj;


static void draw_poly(const struct poly_obj *poly, int m[6])
{
	int n = poly->points;
	int x[n];
	int y[n];
	int i;

	for (i = 0; i != n; i++) {
		x[i] = mx(poly->x[i], poly->y[i], m);
		y[i] = my(poly->x[i], poly->y[i], m);
	}

	fig_poly(n, x, y, COLOR_COMP_DWG, COLOR_NONE, LAYER_COMP_DWG);

	switch (poly->fill) {
	case 'N':
		break;
	case 'F':
		fig_poly(n, x, y, COLOR_NONE, COLOR_COMP_DWG,
		    LAYER_COMP_DWG_BG);
		break;
	case 'f':
		fig_poly(n, x, y, COLOR_NONE, COLOR_COMP_DWG_BG,
		    LAYER_COMP_DWG_BG);
		break;
	default:
		abort();
	}
}


static void draw_rect(const struct rect_obj *rect, int m[6])
{
	int sx = mx(rect->sx, rect->sy, m);
	int sy = my(rect->sx, rect->sy, m);
	int ex = mx(rect->ex, rect->ey, m);
	int ey = my(rect->ex, rect->ey, m);

	fig_rect(sx, sy, ex, ey, COLOR_COMP_DWG, COLOR_NONE, LAYER_COMP_DWG);

	switch (rect->fill) {
	case 'N':
		break;
	case 'F':
		fig_rect(sx, sy, ex, ey, COLOR_NONE, COLOR_COMP_DWG,
		    LAYER_COMP_DWG_BG);
		break;
	case 'f':
		fig_rect(sx, sy, ex, ey, COLOR_NONE, COLOR_COMP_DWG_BG,
		    LAYER_COMP_DWG_BG);
		break;
	default:
		abort();
	}
}


static void draw_circ(const struct circ_obj *circ, int m[6])
{
	int x = mx(circ->x, circ->y, m);
	int y = my(circ->x, circ->y, m);
	int r = circ->r;

	fig_circ(x, y, r, COLOR_COMP_DWG, COLOR_NONE, LAYER_COMP_DWG);

	switch (circ->fill) {
	case 'N':
		break;
	case 'F':
		fig_circ(x, y, r, COLOR_NONE, COLOR_COMP_DWG,
		    LAYER_COMP_DWG_BG);
		break;
	case 'f':
		fig_circ(x, y, r, COLOR_NONE, COLOR_COMP_DWG_BG,
		    LAYER_COMP_DWG_BG);
		break;
	default:
		abort();
	}
}


static void draw_arc(const struct arc_obj *arc, int m[6])
{
	int a = matrix_to_angle(m);
	int x = mx(arc->x, arc->y, m);
	int y = my(arc->x, arc->y, m);
	int sa = angle_add(arc->start_a, a);
	int ea = angle_add(arc->end_a, a);

	fig_arc(x, y, arc->r, sa, ea,
	    COLOR_COMP_DWG, COLOR_NONE, LAYER_COMP_DWG);

	assert(arc->fill == 'N');
}


static void draw_pin(const struct comp *comp, const struct pin_obj *pin,
    int m[6])
{
	int x[2], y[2];
	int dx = 0, dy = 0;
	int ox, oy, sx, sy;
	int rot;
	enum text_align hor;

	switch (pin->orient) {
	case 'U':
		dy = 1;
		rot = 90;
		hor = text_min;
		break;
	case 'D':
		dy = -1;
		rot = 90;
		hor = text_max;
		break;
	case 'R':
		dx = 1;
		rot = 0;
		hor = text_min;
		break;
	case 'L':
		dx = -1;
		rot = 0;
		hor = text_max;
		break;
	default:
		abort();
	}
	x[0] = mx(pin->x, pin->y, m);
	y[0] = my(pin->x, pin->y, m);
	x[1] = mx(pin->x + dx * pin->length, pin->y + dy * pin->length, m);
	y[1] = my(pin->x + dx * pin->length, pin->y + dy * pin->length, m);
	fig_poly(2, x, y, COLOR_COMP_DWG, COLOR_NONE, LAYER_COMP_DWG);

	ox = dx * (pin->length + comp->name_offset);
	oy = dy * (pin->length + comp->name_offset);

	struct text name_txt = {
		.s = pin->name,
		.x = mx(pin->x + ox, pin->y + oy, m),
		.y = my(pin->x + ox, pin->y + oy, m),
		.size = pin->name_size,
		.rot = rot,
		.hor = hor,
		.vert = text_mid,
	};

	text_rot(&name_txt, matrix_to_angle(m));
	if (matrix_is_mirrored(m)) {
		if ((name_txt.rot % 180) == 0)
			name_txt.hor = text_flip(name_txt.hor);
		else
			name_txt.vert = text_flip(name_txt.vert);
	}

	switch (name_txt.rot) {
	case 180:
		text_flip_x(&name_txt);
		break;
	default:
		break;
	}
	if (comp->show_pin_name)
		text_fig(&name_txt, COLOR_PIN_NAME, LAYER_PIN_NAME);

	ox = dx * pin->length / 2;
	oy = dy * pin->length / 2;

	sx = mxr(-dy * PIN_NUM_OFFSET, dx * PIN_NUM_OFFSET, m);
	sy = myr(-dy * PIN_NUM_OFFSET, dx * PIN_NUM_OFFSET, m);
	if (sx > 0)
		sx = -sx;
	if (sy > 0)
		sy = -sy;

	struct text num_txt = {
		.s = pin->number,
		.x = mx(pin->x + ox, pin->y + oy, m) + sx,
		.y = my(pin->x + ox, pin->y + oy, m) + sy,
		.size = pin->number_size,
		.rot = rot,
		.hor = text_mid,
		.vert = text_min,
	};

	text_rot(&num_txt, matrix_to_angle(m) % 180);
	if (matrix_is_mirrored(m)) {
		if ((num_txt.rot % 180) == 0)
			num_txt.hor = text_flip(num_txt.hor);
		else
			num_txt.vert = text_flip(num_txt.vert);
	}

	if (comp->show_pin_num)
		text_fig(&num_txt, COLOR_PIN_NUMBER, LAYER_PIN_NUMBER);

}


static void draw_text(const struct text_obj *text, int m[6])
{
	struct text txt = {
		.s = text->s,
		.size = text->dim,
		.x = mx(text->x, text->y, m),
		.y = my(text->x, text->y, m),
		.rot = matrix_to_angle(m),
		.hor = text_mid,
		.vert = text_mid,
	};

	switch (txt.rot) {
	case 180:
		text_flip_x(&txt);
		break;
	default:
		break;
	}
	text_fig(&txt, COLOR_COMP_DWG, WIDTH_COMP_DWG);
}


static void draw(const struct comp *comp, const struct obj *obj, int m[6])
{
	switch (obj->type) {
	case obj_poly:
		draw_poly(&obj->u.poly, m);
		break;
	case obj_rect:
		draw_rect(&obj->u.rect, m);
		break;
	case obj_circ:
		draw_circ(&obj->u.circ, m);
		break;
	case obj_arc:
		draw_arc(&obj->u.arc, m);
		break;
	case obj_text:
		draw_text(&obj->u.text, m);
		break;
	case obj_pin:
		draw_pin(comp, &obj->u.pin, m);
		break;
	default:
		abort();
	}
}


const struct comp *lib_find(const char *name)
{
	const struct comp *comp;

	for (comp = comps; comp; comp = comp->next)
		if (!strcmp(comp->name, name))
			return comp;
	fprintf(stderr, "\"%s\" not found\n", name);
	exit(1);
}


bool lib_field_visible(const struct comp *comp, int n)
{
	return (comp->visible >> n) & 1;
}


void lib_exec(const struct comp *comp, unsigned unit, int m[4])
{
	const struct obj *obj;

	for (obj = comp->objs; obj; obj = obj->next) {
		if (obj->unit && obj->unit != unit)
			continue;
		draw(comp, obj, m);
	}
}


/* ----- Text -------------------------------------------------------------- */


static enum text_style decode_style(const char *s)
{
	if (!strcmp(s, "Normal"))
		return text_normal;
	assert(0);
}


/* ----- Polygons ---------------------------------------------------------- */


static bool parse_poly(struct poly_obj *poly, const char *line, int points)
{
	int i, n;

	poly->points = points;
	poly->x = alloc_size(sizeof(int) * points);
	poly->y = alloc_size(sizeof(int) * points);
	for (i = 0; i != points; i++) {
		if (sscanf(line, "%d %d %n",
		    poly->x + i, poly->y + i, &n) != 2)
			return 0;
		line += n;
	}
	if (sscanf(line, "%c", &poly->fill) != 1)
		return 0;
	return 1;
}


/* ----- Definitions ------------------------------------------------------- */


static bool parse_def(const char *line)
{
	char *s;
	char draw_num, draw_name;
	unsigned name_offset;
	unsigned units;

	if (sscanf(line, "DEF %ms %*s %*d %u %c %c %u",
	    &s, &name_offset, &draw_num, &draw_name, &units) != 5)
		return 0;

	curr_comp = alloc_type(struct comp);
	if (*s == '~')
		s++;
	curr_comp->name = s;
	curr_comp->units = units;

	curr_comp->visible = 0;
	curr_comp->show_pin_name = draw_name == 'Y';
	curr_comp->show_pin_num = draw_num == 'Y';
	curr_comp->name_offset = name_offset;

	curr_comp->objs = NULL;
	next_obj = &curr_comp->objs;

	curr_comp->next = NULL;
	*next_comp = curr_comp;
	next_comp = &curr_comp->next;

	return 1;
}


/* ----- Arcs -------------------------------------------------------------- */


static bool parse_arc(struct obj *obj, const char *line)
{
	struct arc_obj *arc = &obj->u.arc;
	int a1, a2;

	if (sscanf(line, "A %d %d %d %d %d %u %u %u %c",
	    &arc->x, &arc->y, &arc->r, &a1, &a2, &obj->unit, &obj->convert,
	    &arc->thick, &arc->fill) != 9)
		return 0;

	/*
	 * KiCad arcs can be clockwise or counter-clockwise. They must always
	 * be smaller than 180 degrees.
	 */

	while (a1 < 0)
		a1 += 3600;
	while (a2 < 0)
		a2 += 3600;
	a1 %= 3600;
	a2 %= 3600;
	if (a2 < a1)
		a2 += 3600;
	assert(a2 - a1 != 1800);
	if (a2 - a1 > 1800)
		swap(a1, a2);

	arc->start_a = (a1 % 3600) / 10;
	arc->end_a = (a2 % 3600) / 10;

	return 1;
}


/* ----- Library parser ---------------------------------------------------- */


bool lib_parse(struct lib_ctx *ctx, const char *line)
{
	int n = 0;
	unsigned points;
	struct obj *obj;
	char *style;
	unsigned zero1, zero2;
	char vis;

	ctx->lineno++;

	switch (ctx->state) {
	case lib_skip:
		if (parse_def(line)) {
			ctx->state = lib_def;
			return 1;
		}
		return 1;
	case lib_def:
		if (sscanf(line, "DRAW%n", &n) == 0 && n) {
			ctx->state = lib_draw;
			return 1;
		}
		if (sscanf(line, "F%d \"\" %*d %*d %*d %*c %c", &n, &vis) == 2
		    || sscanf(line, "F%d \"%*[^\"]\" %*d %*d %*d %*c %c",
		    &n, &vis) == 2) {
			if (vis == 'V')
				curr_comp->visible |= 1 << n;
			return 1;
		}
		/* @@@ explicitly ignore FPLIST */
		return 1;
	case lib_draw:
		if (sscanf(line, "ENDDRAW%n", &n) == 0 && n) {
			ctx->state = lib_skip;
			return 1;
		}

		obj = alloc_type(struct obj);
		obj->next = NULL;
		*next_obj = obj;
		next_obj = &obj->next;

		if (sscanf(line, "P %u %u %u %u %n",
		    &points, &obj->unit, &obj->convert, &obj->u.poly.thick,
		    &n) == 4) {
			obj->type = obj_poly;
			if (parse_poly(&obj->u.poly, line + n, points))
				return 1;
			break;
		}
		if (sscanf(line, "S %d %d %d %d %u %u %d %c",
		    &obj->u.rect.sx, &obj->u.rect.sy, &obj->u.rect.ex,
		    &obj->u.rect.ey, &obj->unit, &obj->convert,
		    &obj->u.rect.thick, &obj->u.rect.fill) == 8) {
			obj->type = obj_rect;
			return 1;
		}
		if (sscanf(line, "C %d %d %d %u %u %d %c",
		    &obj->u.circ.x, &obj->u.circ.y, &obj->u.circ.r,
		    &obj->unit, &obj->convert, &obj->u.circ.thick,
		    &obj->u.circ.fill) == 7) {
			obj->type = obj_circ;
			return 1;
		}
		if (parse_arc(obj, line)) {
			obj->type = obj_arc;
			return 1;
		}
		n = sscanf(line,
		    "T %d %d %d %d %u %u %u \"%m[^\"]\" %ms %u %c %c",
		    &obj->u.text.orient, &obj->u.text.x, &obj->u.text.y,
		    &obj->u.text.dim, &zero1, &obj->unit, &obj->convert,
		    &obj->u.text.s, &style, &zero2,
		    &obj->u.text.hor_align, &obj->u.text.vert_align);
		if (n != 12)
			n = sscanf(line,
			    "T %d %d %d %d %u %u %u %ms %ms %u %c %c",
			    &obj->u.text.orient, &obj->u.text.x, &obj->u.text.y,
			    &obj->u.text.dim, &zero1, &obj->unit, &obj->convert,
			    &obj->u.text.s, &style, &zero2,
			    &obj->u.text.hor_align, &obj->u.text.vert_align);
		if (n == 12) {
			if (zero1 || zero2) {
				fprintf(stderr, "%u: only understand 0 x x\n",
				    ctx->lineno);
				exit(1);
			}
			obj->u.text.style = decode_style(style);
			obj->type = obj_text;
			return 1;
		}
		if (sscanf(line, "X %ms %ms %d %d %d %c %d %d %u %u %c",
		    &obj->u.pin.name, &obj->u.pin.number, 
		    &obj->u.pin.x, &obj->u.pin.y, &obj->u.pin.length,
		    &obj->u.pin.orient,
		    &obj->u.pin.number_size, &obj->u.pin.name_size,
		    &obj->unit, &obj->convert, &obj->u.pin.etype) == 11) {
			obj->type = obj_pin;
			return 1;
		}
		break;
	default:
		abort();
	}
	fprintf(stderr, "%u: cannot parse\n\"%s\"\n", ctx->lineno, line);
	exit(1);
}


void lib_init(struct lib_ctx *ctx)
{
	ctx->state = lib_skip;
	ctx->lineno = 0;
}