#include <stdio.h>
#include <assert.h>
#include "csv.h"
#include "api.h"

#include <string.h>
#include "person.h"
#include "vaccine.h"


#define FILE_READ_BUFFER_SIZE 2048
#define VACCINE_LOT_TYPE_NAME "VACCINE_LOT"
#define VACCINE_LOT_NUM_FIELDS 7

// Get the API version information
const char* api_version() {
    return "UOC PP 20212";
}

// Load data from a CSV file. If reset is true, remove previous data
tApiError api_loadData(tApiData* data, const char* filename, bool reset) {
    tApiError error;
    FILE *fin;    
    char buffer[FILE_READ_BUFFER_SIZE];
    tCSVEntry entry;
    
    // Check input data
    assert( data != NULL );
    assert(filename != NULL);
    
    // Reset current data    
    if (reset) {
        // Remove previous information
        error = api_freeData(data);
        if (error != E_SUCCESS) {
            return error;
        }
        
        // Initialize the data
        error = api_initData(data);
        if (error != E_SUCCESS) {
            return error;
        }
    }

    // Open the input file
    fin = fopen(filename, "r");
    if (fin == NULL) {
        return E_FILE_NOT_FOUND;
    }
    
    // Read file line by line
    while (fgets(buffer, FILE_READ_BUFFER_SIZE, fin)) {
        // Remove new line character     
        buffer[strcspn(buffer, "\n\r")] = '\0';
        
        csv_initEntry(&entry);
        csv_parseEntry(&entry, buffer, NULL);
        // Add this new entry to the api Data
        error = api_addDataEntry(data, entry);
        if (error != E_SUCCESS) {
            return error;
        }
        csv_freeEntry(&entry);
    }
    
    fclose(fin);
    
    return E_SUCCESS;
}

// Initialize the data structure
tApiError api_initData(tApiData* data) {            
    //////////////////////////////////
    // Ex PR1 2b
    /////////////////////////////////
    
    population_init(&(data->population));
    vaccineList_init(&(data->vaccines));
    vaccineLotData_init(&(data->vaccineLots));
    
    return E_SUCCESS;
}

// Add a new vaccines lot
tApiError api_addVaccineLot(tApiData* data, tCSVEntry entry) {
    //////////////////////////////////
    // Ex PR1 2c
    /////////////////////////////////
    
    tApiError ret = E_NOT_IMPLEMENTED;
    
    if (csv_numFields(entry) == VACCINE_LOT_NUM_FIELDS) {
        if (csv_getType(&entry) == VACCINE_LOT_TYPE_NAME) {
            // OK
            
            
            
            ret = E_SUCCESS;
            
        } else {
            // numFields other than valid one
            ret = E_INVALID_ENTRY_TYPE;
        }
    } else {
        // csv record type other than valid one
        ret = E_INVALID_ENTRY_FORMAT;
    }

    return ret;
}

// Get the number of persons registered on the application
int api_populationCount(tApiData data) {
    //////////////////////////////////
    // Ex PR1 2d
    /////////////////////////////////
    return -1;
}

// Get the number of vaccines registered on the application
int api_vaccineCount(tApiData data) {
    //////////////////////////////////
    // Ex PR1 2d
    /////////////////////////////////
    return -1;
}

// Get the number of vaccine lots registered on the application
int api_vaccineLotsCount(tApiData data) {
    //////////////////////////////////
    // Ex PR1 2d
    /////////////////////////////////
    return -1;
}


// Free all used memory
tApiError api_freeData(tApiData* data) {
    //////////////////////////////////
    // Ex PR1 2e
    /////////////////////////////////
    return E_NOT_IMPLEMENTED;
}


// Add a new entry
tApiError api_addDataEntry(tApiData* data, tCSVEntry entry) { 
    //////////////////////////////////
    // Ex PR1 2f
    /////////////////////////////////
    return E_NOT_IMPLEMENTED;
}

// Get vaccine data
tApiError api_getVaccine(tApiData data, const char *name, tCSVEntry *entry) {
    //////////////////////////////////
    // Ex PR1 3a
    /////////////////////////////////
    return E_NOT_IMPLEMENTED; 
}

// Get vaccine lot data
tApiError api_getVaccineLot(tApiData data, const char* cp, const char* vaccine, tDateTime timestamp, tCSVEntry *entry) {
    //////////////////////////////////
    // Ex PR1 3b
    /////////////////////////////////
    return E_NOT_IMPLEMENTED; 
}

// Get registered vaccines
tApiError api_getVaccines(tApiData data, tCSVData *vaccines) {
    //////////////////////////////////
    // Ex PR1 3c
    /////////////////////////////////
    return E_NOT_IMPLEMENTED; 
}

// Get vaccine lots
tApiError api_getVaccineLots(tApiData data, tCSVData *lots) {
    //////////////////////////////////
    // Ex PR1 3d
    /////////////////////////////////
    return E_NOT_IMPLEMENTED; 
}