/*
 * db.h - Parts database
 *
 * Copyright 2012 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.
 */


#ifndef DB_H
#define	DB_H

#include <stdio.h>


struct exchange {
	const struct currency *dst;
	double rate;	/* dst = rate*src */
	struct exchange *next;
};

struct currency {
	const char *name;
	struct exchange *exchange;
	struct currency *next;
};

/*
 * If quantity increases, next entry is next higher discount.
 * If quantity decreases, next entries are prices after reaching the large
 * quantity.
 *
 * Examples:
 *
 * An order of 12 units with the prices below
 *
 * a) 1 0.5  10 4.0  100 30.0
 * b) 1 0.5  10 4.0  1 0.4  100 30.0
 *
 * would cost
 *
 * a) 1*4.0+2*0.5 = 5.0
 * b) 1*4.0+2*0.4 = 4.8
 */

struct price {
	int qty;	/* order quantity */
	double value;	/* per quantity cost */
	struct price *next; /* next qty */
};

struct provider {
	const char *name;
	const struct currency *curr;
	double shipping; /* S&H cost */
	double minimum;	/* value of minimum order, before S&H */
	struct provider *next;
};

/*
 * Handling of multiple forms of packaging:
 *
 * - category is a keyword that identifies the packaging type, e.g.,
 *   T for tape/tray, MAN for manual feeding, etc.
 * - a query can be constrained to a set of categories
 * - conversion options (e.g., "Digi-Reel") can be expressed as additional
 *   entries
 *
 * @@@ To do: shared availability
 */

struct stock {
	const struct provider *provider;
	const char *cat; /* category */
	int avail;	/* items in stock */
	int package;	/* "natural" quantity (reel, tray, bag, etc.) */
	const struct currency *curr;
	double add;	/* additive element of cost */
	struct price *price;
} stock;

struct part {
	const char *domain;
	const char *name;
	struct param *param;	/* NULL if @@@ */
	struct stock *stock;	/* NULL if vendor part */
	struct part *next;	/* alias loop (cyclic) */
	struct part *prev;
};


struct part *part_lookup(const char *domain, const char *name);
struct part *part_add(const char *domain, const char *name);
void part_alias(struct part *a, struct part *b);
void part_finalize(struct part *part, const struct action *act);
void part_add_stock(struct part *part, struct stock *s);
void part_dump(FILE *file, const struct part *part);
void parts_dump(FILE *file);

const struct currency *currency_lookup(const char *name);
double currency_convert(const struct currency *from, const struct currency *to,
    double value);
struct currency *currency_add(const char *name);
void currency_exchange(struct currency *from, const struct currency *to,
    double rate);

struct provider *provider_lookup(const char *name);
struct provider *provider_add(const char *name);

const struct part **select_parametric(struct param *vars,
    const struct action *act);

#endif /* !DB_H */