// package_delivery_system.c
// Pantea Aria
// (TODO)

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

#include "package_delivery_system.h"

// Function prototypes
// ADD YOUR OWN FUNCTION PROTOTYPES HERE


// Function definitions

// Creates a new empty delivery centre
// (TODO)
struct delivery_centre *create_centre(char name[]) {
    // TODO: implement this function
    printf("create_centre not yet implemented.\n");
    exit(1);
}

// Add a new package to the centre at the head
// Similar to previous lecture code insert_head
// (TODO)
void insert_package_at_head(struct delivery_centre *centre, char sender[],
    char receiver[], double weight, enum priority_type priority,
    enum status_type status) {
    // TODO: implement this function
    printf("insert_package_at_head not yet implemented.\n");
    exit(1);
}

// Given a string, look for package where the receiver is this string
// (TODO)
struct package *search_package(struct delivery_centre *centre,
    char receiver[]) {
    // TODO: implement this function
    printf("search_package not yet implemented.\n");
    exit(1);
}

// Removes all packages from a centre
// clears and deletes associated memory of centre and packages in it
void clear_centre(struct delivery_centre *centre) {
    // TODO: implement this function
    printf("clear_centre not yet implemented.\n");
    exit(1);
}

// Remove package(s) with certain priority
void delete_package_of_priority(struct delivery_centre *centre,
    enum priority_type priority) {
    // TODO: implement this function
    printf("delete_package_of_priority not yet implemented.\n");
    exit(1);
}

// Append packages from centre_2 after centre_1 and returns them in one centre
// Assumption made here assumes no same receiver package in centre_1 and centre_2
struct delivery_centre *merge_centres(char merged_centre_name[],
    struct delivery_centre *centre_1, struct delivery_centre *centre_2) {
    // TODO: implement this function
    printf("merge_centres not yet implemented.\n");
    exit(1);
}

// Split packages in a given centre into 3 centres based on package status
// keeping original ordering
// assumption: pending, in_transit and delivered are centres already malloc-ed
// and initialised
void split_centre(struct delivery_centre *given_centre,
    struct delivery_centre *pending,
    struct delivery_centre *in_transit,
    struct delivery_centre *delivered) {
    // TODO: implement this function
    printf("split_centre not yet implemented.\n");
    exit(1);
}

// returns number of packages in a given centre
// (EXTENSION TODO: Improve this)
int count_packages(struct delivery_centre *centre) {
    int counter = 0;
    struct package *current = centre->packages;
    while (current != NULL) {
        counter++;
        current = current->next;
    }
    return counter;
}


// Your functions here (include function comments):


////////////////////////////////////////////////////////////////////////////////
//                              Provided Code                                //
////////////////////////////////////////////////////////////////////////////////

// Print/display all packages in centre
// Similar to previous lecture code print_list
void print_packages(struct delivery_centre *centre) {
    printf("Centre Name: %s\n", centre->name);
    struct package *current = centre->packages;

    if (current == NULL) {
        printf("There are no packages in this centre.\n");
    }

    while (current != NULL) {
        printf("---\n");
        print_single_package(current);
        current = current->next;
    }
}

// Prints out details of a single package
void print_single_package(struct package *package) {
    if (package == NULL) {
        printf("Package is NULL.\n");
        return;
    }

    printf("Sender: %s\n", package->sender);
    printf("Receiver: %s\n", package->receiver);
    printf("Weight: %lfkg\n", package->weight);

    printf("Priority: ");
    if (package->priority == STANDARD) {
        printf("STANDARD\n");
    } else if (package->priority == EXPRESS) {
        printf("EXPRESS\n");
    } else if (package->priority == URGENT) {
        printf("URGENT\n");
    } else {
        printf("UNKNOWN\n");
    }

    printf("Status: ");
    if (package->status == PENDING) {
        printf("PENDING\n");
    } else if (package->status == IN_TRANSIT) {
        printf("IN_TRANSIT\n");
    } else if (package->status == DELIVERED) {
        printf("DELIVERED\n");
    } else {
        printf("UNKNOWN\n");
    }
}