#include "fatfs.h"
#include "filesystem-api.h"
#include "sd-filesystem.h"
#include "menu/menu.h"
#include "menu/menu_item.h"

FS_Api* fs_api_alloc() {
    FS_Api* fs_api = furi_alloc(sizeof(FS_Api));

    // fill file api
    fs_api->file.open = fs_file_open;
    fs_api->file.close = fs_file_close;
    fs_api->file.read = fs_file_read;
    fs_api->file.write = fs_file_write;
    fs_api->file.seek = fs_file_seek;
    fs_api->file.tell = fs_file_tell;
    fs_api->file.truncate = fs_file_truncate;
    fs_api->file.size = fs_file_size;
    fs_api->file.sync = fs_file_sync;
    fs_api->file.eof = fs_file_eof;

    // fill dir api
    fs_api->dir.open = fs_dir_open;
    fs_api->dir.close = fs_dir_close;
    fs_api->dir.read = fs_dir_read;
    fs_api->dir.rewind = fs_dir_rewind;

    // fill common api
    fs_api->common.info = fs_common_info;
    fs_api->common.remove = fs_common_remove;
    fs_api->common.rename = fs_common_rename;
    fs_api->common.set_attr = fs_common_set_attr;
    fs_api->common.mkdir = fs_common_mkdir;
    fs_api->common.set_time = fs_common_set_time;
    fs_api->common.get_fs_info = fs_get_fs_info;

    // fill errors api
    fs_api->error.get_desc = fs_error_get_desc;
    fs_api->error.get_internal_desc = fs_error_get_internal_desc;

    return fs_api;
}

void sd_set_lines(SdApp* sd_app, uint8_t count, ...) {
    va_list argptr;
    count = min(count, SD_STATE_LINES_COUNT);

    for(uint8_t i = 0; i < SD_STATE_LINES_COUNT; i++) {
        sd_app->line[i] = "";
    }

    va_start(argptr, count);

    for(uint8_t i = 0; i < count; i++) {
        sd_app->line[i] = va_arg(argptr, char*);
    }

    va_end(argptr);
}

void sd_icon_draw_callback(Canvas* canvas, void* context) {
    furi_assert(canvas);
    furi_assert(context);
    SdApp* sd_app = context;

    switch(sd_app->info.status) {
    case SD_NO_CARD:
        break;
    case SD_OK:
        canvas_draw_icon(canvas, 0, 0, sd_app->icon.mounted);
        break;
    default:
        canvas_draw_icon(canvas, 0, 0, sd_app->icon.fail);
        break;
    }
}

void sd_app_draw_callback(Canvas* canvas, void* context) {
    furi_assert(canvas);
    furi_assert(context);
    SdApp* sd_app = context;

    canvas_clear(canvas);
    canvas_set_color(canvas, ColorBlack);
    canvas_set_font(canvas, FontPrimary);

    for(uint8_t i = 0; i < SD_STATE_LINES_COUNT; i++) {
        canvas_draw_str(canvas, 0, (i + 1) * 10, sd_app->line[i]);
    }
}

void sd_app_input_callback(InputEvent* event, void* context) {
    furi_assert(context);
    SdApp* sd_app = context;

    osMessageQueuePut(sd_app->event_queue, event, 0, 0);
}

SdApp* sd_app_alloc() {
    SdApp* sd_app = furi_alloc(sizeof(SdApp));

    // init inner fs data
    if(!_fs_init(&sd_app->info)) {
        furiac_exit(NULL);
    }

    sd_app->event_queue = osMessageQueueNew(1, sizeof(InputEvent), NULL);

    // init widget
    sd_app->widget = widget_alloc();
    widget_draw_callback_set(sd_app->widget, sd_app_draw_callback, sd_app);
    widget_input_callback_set(sd_app->widget, sd_app_input_callback, sd_app);
    widget_enabled_set(sd_app->widget, false);

    // init lines
    sd_set_lines(sd_app, 0);

    // init icon widget
    sd_app->icon.widget = widget_alloc();
    sd_app->icon.mounted = assets_icons_get(I_SDcardMounted_11x8);
    sd_app->icon.fail = assets_icons_get(I_SDcardFail_11x8);
    widget_set_width(sd_app->icon.widget, icon_get_width(sd_app->icon.mounted));
    widget_draw_callback_set(sd_app->icon.widget, sd_icon_draw_callback, sd_app);
    widget_enabled_set(sd_app->icon.widget, false);

    return sd_app;
}

bool app_sd_ask(SdApp* sd_app, Input input_true, Input input_false) {
    bool result;

    InputEvent event;
    while(1) {
        osStatus_t event_status =
            osMessageQueueGet(sd_app->event_queue, &event, NULL, osWaitForever);

        if(event_status == osOK) {
            if(event.state && event.input == input_true) {
                result = true;
                break;
            }
            if(event.state && event.input == InputBack) {
                result = false;
                break;
            }
        }
    }

    return result;
}

void app_sd_info_callback(void* context) {
    furi_assert(context);
    SdApp* sd_app = context;
    widget_enabled_set(sd_app->widget, true);

    // dynamic strings
    const uint8_t str_buffer_size = 26;
    const uint8_t str_count = 6;
    char* str_buffer[str_count];
    bool memory_error = false;

    // info vars
    uint32_t serial_num;
    SDError get_label_result, get_free_result;
    FATFS* fs;
    uint32_t free_clusters, free_sectors, total_sectors;
    char volume_label[34];

    // init strings
    for(uint8_t i = 0; i < str_count; i++) {
        str_buffer[i] = malloc(str_buffer_size + 1);
        if(str_buffer[i] == NULL) {
            memory_error = true;
        } else {
            snprintf(str_buffer[i], str_buffer_size, "");
        }
    }

    if(memory_error) {
        sd_set_lines(sd_app, 1, "not enough memory");
    } else {
        // get fs info
        _fs_lock(&sd_app->info);
        get_label_result = f_getlabel(sd_app->info.path, volume_label, &serial_num);
        get_free_result = f_getfree(sd_app->info.path, &free_clusters, &fs);
        _fs_unlock(&sd_app->info);

        // calculate size
        total_sectors = (fs->n_fatent - 2) * fs->csize;
        free_sectors = free_clusters * fs->csize;
        uint16_t sector_size = _MAX_SS;
#if _MAX_SS != _MIN_SS
        sector_size = fs->ssize;
#endif

        // output info to dynamic strings
        if(get_label_result == SD_OK && get_free_result == SD_OK) {
            snprintf(str_buffer[0], str_buffer_size, "%s", volume_label);

            const char* fs_type = "";

            switch(fs->fs_type) {
            case(FS_FAT12):
                fs_type = "FAT12";
                break;
            case(FS_FAT16):
                fs_type = "FAT16";
                break;
            case(FS_FAT32):
                fs_type = "FAT32";
                break;
            case(FS_EXFAT):
                fs_type = "EXFAT";
                break;
            default:
                fs_type = "UNKNOWN";
                break;
            }

            snprintf(str_buffer[1], str_buffer_size, "%s, S/N: %lu", fs_type, serial_num);

            snprintf(str_buffer[2], str_buffer_size, "Cluster: %d sectors", fs->csize);
            snprintf(str_buffer[3], str_buffer_size, "Sector: %d bytes", sector_size);
            snprintf(
                str_buffer[4], str_buffer_size, "%lu KB total", total_sectors / 1024 * sector_size);
            snprintf(
                str_buffer[5], str_buffer_size, "%lu KB free", free_sectors / 1024 * sector_size);
        } else {
            snprintf(str_buffer[0], str_buffer_size, "SD status error:");
            snprintf(
                str_buffer[1],
                str_buffer_size,
                "%s",
                fs_error_get_internal_desc(_fs_status(&sd_app->info)));
            snprintf(str_buffer[2], str_buffer_size, "Label error:");
            snprintf(
                str_buffer[3], str_buffer_size, "%s", fs_error_get_internal_desc(get_label_result));
            snprintf(str_buffer[4], str_buffer_size, "Get free error:");
            snprintf(
                str_buffer[5], str_buffer_size, "%s", fs_error_get_internal_desc(get_free_result));
        }

        // dynamic strings to screen
        sd_set_lines(
            sd_app,
            6,
            str_buffer[0],
            str_buffer[1],
            str_buffer[2],
            str_buffer[3],
            str_buffer[4],
            str_buffer[5]);
    }

    app_sd_ask(sd_app, InputBack, InputBack);

    sd_set_lines(sd_app, 0);
    widget_enabled_set(sd_app->widget, false);

    for(uint8_t i = 0; i < str_count; i++) {
        free(str_buffer[i]);
    }
}

void app_sd_format_callback(void* context) {
    furi_assert(context);
    SdApp* sd_app = context;
    uint8_t* work_area;

    // ask to really format
    sd_set_lines(sd_app, 2, "Press UP to format", "or BACK to exit");
    widget_enabled_set(sd_app->widget, true);

    // wait for input
    if(!app_sd_ask(sd_app, InputUp, InputBack)) {
        widget_enabled_set(sd_app->widget, false);
        return;
    }

    // show warning
    sd_set_lines(sd_app, 3, "formatting SD card", "procedure can be lengthy", "please wait");

    // format card
    _fs_lock(&sd_app->info);
    work_area = malloc(_MAX_SS);
    if(work_area == NULL) {
        sd_app->info.status = SD_NOT_ENOUGH_CORE;
    } else {
        sd_app->info.status = f_mkfs(sd_app->info.path, FM_ANY, 0, work_area, _MAX_SS);
        free(work_area);

        if(sd_app->info.status == SD_OK) {
            // set label and mount card
            f_setlabel("Flipper SD");
            sd_app->info.status = f_mount(&sd_app->info.fat_fs, sd_app->info.path, 1);
        }
    }

    if(sd_app->info.status != SD_OK) {
        sd_set_lines(
            sd_app, 2, "SD card format error", fs_error_get_internal_desc(sd_app->info.status));
    } else {
        sd_set_lines(sd_app, 1, "SD card formatted");
    }

    _fs_unlock(&sd_app->info);

    // wait for BACK
    app_sd_ask(sd_app, InputBack, InputBack);

    widget_enabled_set(sd_app->widget, false);
}

void app_sd_unmount_card(SdApp* sd_app) {
    _fs_lock(&sd_app->info);

    // set status
    sd_app->info.status = SD_NO_CARD;
    widget_enabled_set(sd_app->icon.widget, false);

    // close files
    for(uint8_t index = 0; index < SD_FS_MAX_FILES; index++) {
        FileData* filedata = &sd_app->info.files[index];

        if(filedata->thread_id != NULL) {
            if(filedata->is_dir) {
                f_closedir(&filedata->data.dir);
            } else {
                f_close(&filedata->data.file);
            }
            filedata->thread_id = NULL;
        }
    }

    // unmount volume
    f_mount(0, sd_app->info.path, 0);

    _fs_unlock(&sd_app->info);
}

void app_sd_eject_callback(void* context) {
    furi_assert(context);
    SdApp* sd_app = context;

    sd_set_lines(sd_app, 1, "ejecting SD card");
    widget_enabled_set(sd_app->widget, true);

    app_sd_unmount_card(sd_app);

    sd_set_lines(sd_app, 1, "SD card can be pulled out");

    // wait for BACK
    app_sd_ask(sd_app, InputBack, InputBack);

    widget_enabled_set(sd_app->widget, false);
}

void sd_filesystem(void* p) {
    SdApp* sd_app = sd_app_alloc();
    FS_Api* fs_api = fs_api_alloc();

    Gui* gui = furi_open("gui");
    gui_add_widget(gui, sd_app->widget, GuiLayerFullscreen);
    gui_add_widget(gui, sd_app->icon.widget, GuiLayerStatusBarLeft);

    // add api record
    if(!furi_create("sdcard", fs_api)) {
        furiac_exit(NULL);
    }

    // init menu
    // TODO menu icon
    MenuItem* menu_item;
    menu_item = menu_item_alloc_menu("SD Card", assets_icons_get(I_SDcardMounted_11x8));

    menu_item_subitem_add(
        menu_item, menu_item_alloc_function("Info", NULL, app_sd_info_callback, sd_app));
    menu_item_subitem_add(
        menu_item, menu_item_alloc_function("Format", NULL, app_sd_format_callback, sd_app));
    menu_item_subitem_add(
        menu_item, menu_item_alloc_function("Eject", NULL, app_sd_eject_callback, sd_app));

    // add item to menu
    ValueMutex* menu_vm = furi_open("menu");
    furi_check(menu_vm);
    with_value_mutex(
        menu_vm, (Menu * menu) { menu_item_add(menu, menu_item); });

    furiac_ready();

    printf("[sd_filesystem] start\n");

    // sd card cycle
    bool sd_was_present = true;

    while(true) {
        if(sd_was_present) {
            if(hal_gpio_read_sd_detect()) {
                printf("[sd_filesystem] card detected\n");

                uint8_t bsp_result = BSP_SD_Init();

                if(bsp_result) {
                    sd_app->info.status = SD_LOW_LEVEL_ERR;
                    printf("[sd_filesystem] bsp error: %x\n", bsp_result);
                } else {
                    printf("[sd_filesystem] bsp ok\n");
                    sd_app->info.status = f_mount(&sd_app->info.fat_fs, sd_app->info.path, 1);

                    if(sd_app->info.status != SD_OK) {
                        printf("[sd_filesystem] mount error: %d\n", sd_app->info.status);
                    } else {
                        printf("[sd_filesystem] mount ok\n");
                    }
                }

                widget_enabled_set(sd_app->icon.widget, true);
                sd_was_present = false;
            }
        } else {
            if(!hal_gpio_read_sd_detect()) {
                printf("[sd_filesystem] card removed\n");

                widget_enabled_set(sd_app->icon.widget, false);
                app_sd_unmount_card(sd_app);
                sd_was_present = true;
            }
        }

        delay(1000);
    }
}