// package_delivery_system.h
// Pantea Aria
// Header file for package delivery system functions



#define PACKAGE_DELIVERY_SYSTEM_H

// #defines
#define MAX_LEN 100

// enum definition
enum priority_type {
    STANDARD,
    EXPRESS,
    URGENT
};

enum status_type {
    PENDING,
    IN_TRANSIT,
    DELIVERED
};

// struct definitions
struct delivery_centre {
    char name[MAX_LEN];
    //int num_packages; // to use later :)
    struct package *packages;
};

struct package {
    char sender[MAX_LEN];
    char receiver[MAX_LEN];
    double weight;
    enum priority_type priority;
    enum status_type status;
    struct package *next;
};

// Creates a new empty delivery centre
struct delivery_centre *create_centre(char name[]);

// Add a new package to the centre at the head
void insert_package_at_head(struct delivery_centre *centre,
    char sender[], char receiver[],
    double weight, enum priority_type priority,
    enum status_type status);

// Given a string, look for package where the receiver is this string
struct package *search_package(struct delivery_centre *centre,
    char receiver[]);

// Remove package(s) with certain priority
void delete_package_of_priority(struct delivery_centre *centre,
    enum priority_type priority);

// Append packages from centre_2 after centre_1 and returns them in one centre
struct delivery_centre *merge_centres(char merged_centre_name[],
    struct delivery_centre *centre_1, struct delivery_centre *centre_2);

// Split packages into 3 centres based on status
void split_centre(struct delivery_centre *given_centre,
    struct delivery_centre *pending,
    struct delivery_centre *in_transit,
    struct delivery_centre *delivered);

// Removes all packages from a centre
void clear_centre(struct delivery_centre *centre);

// Returns number of packages in a given centre
int count_packages(struct delivery_centre *centre);

// Prints out details of a single package
void print_single_package(struct package *package);

// Print/display all packages in centre
void print_packages(struct delivery_centre *centre);

// create package
struct package *create_package(char sender[],
    char receiver[], double weight, enum priority_type priority,
    enum status_type status);