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#include "fatfs.h"
#include "webservice.h"
#include <stdlib.h>
#include <stdio.h>
#include "esp_vfs.h"
#include "esp_vfs_fat.h"
#include "esp_system.h"
#include "nvmem/nvmem.h"
#include "string.h"

//module name
const char *fatfs_mod_name = "FAT-FS MGMT";

//root directory name
const char *base_path = "/root";

//files paths
const char home_path[] = "/root/pages/home.htm";
const char reg_path[] = "/root/pages/reg.htm";
const char cmds_path[] = "/root/pages/cmds.htm";
const char meas_path[] = "/root/pages/meas.htm";
const char log_path[] = "/root/pages/log.htm";

char *file_paths[5]={&home_path,&reg_path,&cmds_path,&meas_path,&log_path};

//Handle of the wear levelling library instance when unlocked for file writing...
//static wl_handle_t s_wl_handle = WL_INVALID_HANDLE;

FILE *home_page = NULL;
FILE *reg_page = NULL;
FILE *cmds_page = NULL;
FILE *meas_page = NULL;
FILE *log_page = NULL;

FILE *file_list[5];

char home_page_buff[MAX_FILE_SZ];
char reg_page_buff[MAX_FILE_SZ];
char cmds_page_buff[MAX_FILE_SZ];
char meas_page_buff[MAX_FILE_SZ];
char log_page_buff[MAX_FILE_SZ];

char *html_pages_list[5]={&home_page_buff,&reg_page_buff,&cmds_page_buff,&meas_page_buff,&log_page_buff};

uint32_t home_sz, reg_sz, cmds_sz, meas_sz, log_sz;
uint32_t *file_sz_list[5]={&home_sz,&reg_sz,&cmds_sz,&meas_sz,&log_sz};


void FileSystem_Init() {
    
    ESP_LOGI(fatfs_mod_name, "Mounting FAT filesystem");

    const esp_vfs_fat_mount_config_t mount_config = {
            .max_files = 10,
            .format_if_mount_failed = false,
            .allocation_unit_size = CONFIG_WL_SECTOR_SIZE
    };

    esp_err_t err;
    err = esp_vfs_fat_spiflash_mount_ro(base_path, FATFS_PARTITION_NAME, &mount_config);
    if (err != ESP_OK) {
        ESP_LOGE(fatfs_mod_name, "Failed to mount FATFS (%s)", esp_err_to_name(err));
        return;
    }

    //Load files contents
    uint_fast8_t c = 0;
    uint_fast32_t i = 0;
    for(uint_fast8_t k=0; k<5; k++) {
        file_list[k] = fopen(file_paths[k],"r");

        if(file_list[k] == NULL) {
            ESP_LOGE(fatfs_mod_name, "Failed to open file %u for reading",k);
            continue;
        }

        while(c != EOF) {
            c = fgetc(file_list[k]);
            if(c != EOF) html_pages_list[k][i++] = c;
        }
        html_pages_list[k][i] = '\0';
        *file_sz_list[k] = i;
        c = 0;
        i = 0;

        fclose(file_list[k]);
    }
    

    //Point webservice page pointers to buffers
    p_home_page_buff = home_page_buff;
    p_reg_page_buff = reg_page_buff;
    p_cmds_page_buff = cmds_page_buff;
    p_meas_page_buff = meas_page_buff;
    p_log_page_buff = log_page_buff;
}