/*
 * SPDX-FileCopyrightText: 2015-2021 Espressif Systems (Shanghai) CO LTD
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#include <stdint.h>
#include <string.h>
#include <stdlib.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "esp_err.h"
#include "esp_log.h"
#include "test_usb_mock_classes.h"
#include "test_usb_common.h"
#include "msc_client.h"
#include "usb/usb_host.h"
#include "unity.h"
#include "test_utils.h"

/*
Implementation of an asynchronous MSC client used for USB Host disconnection test.

- The MSC client will:
    - Register itself as a client
    - Receive USB_HOST_CLIENT_EVENT_NEW_DEV event message, and open the device
    - Allocate IN and OUT transfer objects for MSC SCSI transfers
    - Trigger a single MSC SCSI transfer
        - Split the data stage into multiple transfers (so that the endpoint multiple queued up transfers)
        - Cause a disconnection mid-way through the data stage
    - All of the transfers should be automatically deqeueud
    - Then a USB_HOST_CLIENT_EVENT_DEV_GONE event should occur afterwards
    - Free transfer objects
    - Close device
    - Deregister MSC client
*/

#define MAX(x,y)                        (((x) >= (y)) ? (x) : (y))
#define MSC_CLIENT_MAX_EVENT_MSGS       5

typedef enum {
    TEST_STAGE_WAIT_CONN,
    TEST_STAGE_DEV_OPEN,
    TEST_STAGE_MSC_RESET,
    TEST_STAGE_MSC_CBW,
    TEST_STAGE_MSC_DATA_DCONN,
    TEST_STAGE_DEV_CLOSE,
} test_stage_t;

typedef struct {
    msc_client_test_param_t test_param;
    test_stage_t cur_stage;
    test_stage_t next_stage;
    uint8_t dev_addr_to_open;
    usb_host_client_handle_t client_hdl;
    usb_device_handle_t dev_hdl;
    int num_data_transfers;
    int event_count;
} msc_client_obj_t;

static void msc_reset_cbw_transfer_cb(usb_transfer_t *transfer)
{
    msc_client_obj_t *msc_obj = (msc_client_obj_t *)transfer->context;
    //We expect the reset and CBW transfers to complete with no issues
    TEST_ASSERT_EQUAL(USB_TRANSFER_STATUS_COMPLETED, transfer->status);
    TEST_ASSERT_EQUAL(transfer->num_bytes, transfer->actual_num_bytes);
    switch (msc_obj->cur_stage) {
        case TEST_STAGE_MSC_RESET:
            msc_obj->next_stage = TEST_STAGE_MSC_CBW;
            break;
        case TEST_STAGE_MSC_CBW:
            msc_obj->next_stage = TEST_STAGE_MSC_DATA_DCONN;
            break;
        default:
            abort();
            break;
    }
}

static void msc_data_transfer_cb(usb_transfer_t *transfer)
{
    //The data stage should have either completed, or failed due to the disconnection.
    TEST_ASSERT(transfer->status == USB_TRANSFER_STATUS_COMPLETED || transfer->status == USB_TRANSFER_STATUS_NO_DEVICE);
    if (transfer->status == USB_TRANSFER_STATUS_COMPLETED) {
        TEST_ASSERT_EQUAL(transfer->num_bytes, transfer->actual_num_bytes);
    } else {
        TEST_ASSERT_EQUAL(0, transfer->actual_num_bytes);
    }
    msc_client_obj_t *msc_obj = (msc_client_obj_t *)transfer->context;
    msc_obj->event_count++;
    //If all transfers dequeued and device gone event occurred. Go to next stage
    if (msc_obj->event_count >= msc_obj->num_data_transfers + 1) {
        msc_obj->next_stage = TEST_STAGE_DEV_CLOSE;
    }
}

static void msc_client_event_cb(const usb_host_client_event_msg_t *event_msg, void *arg)
{
    msc_client_obj_t *msc_obj = (msc_client_obj_t *)arg;
    switch (event_msg->event) {
        case USB_HOST_CLIENT_EVENT_NEW_DEV:
            TEST_ASSERT_EQUAL(TEST_STAGE_WAIT_CONN, msc_obj->cur_stage);
            msc_obj->next_stage = TEST_STAGE_DEV_OPEN;
            msc_obj->dev_addr_to_open = event_msg->new_dev.address;
            break;
        case USB_HOST_CLIENT_EVENT_DEV_GONE:
            msc_obj->event_count++;
            //If all transfers dequeued and device gone event occurred. Go to next stage
            if (msc_obj->event_count >= msc_obj->num_data_transfers + 1) {
                msc_obj->next_stage = TEST_STAGE_DEV_CLOSE;
            }
            break;
        default:
            abort();    //Should never occur in this test
            break;
    }
}

void msc_client_async_dconn_task(void *arg)
{
    msc_client_obj_t msc_obj;
    memcpy(&msc_obj.test_param, arg, sizeof(msc_client_test_param_t));
    msc_obj.cur_stage = TEST_STAGE_WAIT_CONN;
    msc_obj.next_stage = TEST_STAGE_WAIT_CONN;
    msc_obj.dev_addr_to_open = 0;
    msc_obj.client_hdl = NULL;
    msc_obj.dev_hdl = NULL;
    msc_obj.num_data_transfers = msc_obj.test_param.num_sectors_per_xfer / MOCK_MSC_SCSI_SECTOR_SIZE;
    msc_obj.event_count = 0;

    //Register client
    usb_host_client_config_t client_config = {
        .client_event_callback = msc_client_event_cb,
        .callback_arg = (void *)&msc_obj,
        .max_num_event_msg = MSC_CLIENT_MAX_EVENT_MSGS,
    };
    TEST_ASSERT_EQUAL(ESP_OK, usb_host_client_register(&client_config, &msc_obj.client_hdl));

    //Allocate transfers
    usb_transfer_t *xfer_out;   //Must be large enough to contain CBW and MSC reset control transfer
    usb_transfer_t *xfer_in[msc_obj.num_data_transfers];   //We manually split the data stage into multiple transfers
    size_t xfer_out_size = MAX(sizeof(mock_msc_bulk_cbw_t), sizeof(usb_setup_packet_t));
    size_t xfer_in_size = MOCK_MSC_SCSI_SECTOR_SIZE;
    TEST_ASSERT_EQUAL(ESP_OK, usb_host_transfer_alloc(xfer_out_size, 0, &xfer_out));
    xfer_out->context = (void *)&msc_obj;
    for (int i = 0; i < msc_obj.num_data_transfers; i++) {
        TEST_ASSERT_EQUAL(ESP_OK, usb_host_transfer_alloc(xfer_in_size, 0, &xfer_in[i]));
        xfer_in[i]->context = (void *)&msc_obj;
    }

    //Wait to be started by main thread
    ulTaskNotifyTake(pdTRUE, portMAX_DELAY);
    ESP_LOGD(MSC_CLIENT_TAG, "Starting");

    bool exit_loop = false;
    bool skip_event_handling = false;
    while (!exit_loop) {
        if (!skip_event_handling) {
            TEST_ASSERT_EQUAL(ESP_OK, usb_host_client_handle_events(msc_obj.client_hdl, portMAX_DELAY));
        }
        skip_event_handling = false;
        if (msc_obj.cur_stage == msc_obj.next_stage) {
            continue;
        }
        msc_obj.cur_stage = msc_obj.next_stage;

        switch (msc_obj.cur_stage) {
            case TEST_STAGE_DEV_OPEN: {
                ESP_LOGD(MSC_CLIENT_TAG, "Open");
                //Open the device
                TEST_ASSERT_EQUAL(ESP_OK, usb_host_device_open(msc_obj.client_hdl, msc_obj.dev_addr_to_open, &msc_obj.dev_hdl));
                //Target our transfers to the device
                xfer_out->device_handle = msc_obj.dev_hdl;
                xfer_out->callback = msc_reset_cbw_transfer_cb;
                for (int i = 0; i < msc_obj.num_data_transfers; i++) {
                    xfer_in[i]->device_handle = msc_obj.dev_hdl;
                    xfer_in[i]->callback = msc_data_transfer_cb;
                }
                //Check the VID/PID of the opened device
                const usb_device_desc_t *device_desc;
                TEST_ASSERT_EQUAL(ESP_OK, usb_host_get_device_descriptor(msc_obj.dev_hdl, &device_desc));
                TEST_ASSERT_EQUAL(msc_obj.test_param.idVendor, device_desc->idVendor);
                TEST_ASSERT_EQUAL(msc_obj.test_param.idProduct, device_desc->idProduct);
                //Claim the MSC interface
                TEST_ASSERT_EQUAL(ESP_OK, usb_host_interface_claim(msc_obj.client_hdl, msc_obj.dev_hdl, MOCK_MSC_SCSI_INTF_NUMBER, MOCK_MSC_SCSI_INTF_ALT_SETTING));
                msc_obj.next_stage = TEST_STAGE_MSC_RESET;
                skip_event_handling = true; //Need to execute TEST_STAGE_MSC_RESET
                break;
            }
            case TEST_STAGE_MSC_RESET: {
                ESP_LOGD(MSC_CLIENT_TAG, "MSC Reset");
                //Send an MSC SCSI interface reset
                MOCK_MSC_SCSI_REQ_INIT_RESET((usb_setup_packet_t *)xfer_out->data_buffer, MOCK_MSC_SCSI_INTF_NUMBER);
                xfer_out->num_bytes = sizeof(usb_setup_packet_t);
                xfer_out->bEndpointAddress = 0;
                TEST_ASSERT_EQUAL(ESP_OK, usb_host_transfer_submit_control(msc_obj.client_hdl, xfer_out));
                //Next stage set from transfer callback
                break;
            }
            case TEST_STAGE_MSC_CBW: {
                ESP_LOGD(MSC_CLIENT_TAG, "CBW");
                mock_msc_scsi_init_cbw((mock_msc_bulk_cbw_t *)xfer_out->data_buffer, true, 0, msc_obj.test_param.num_sectors_per_xfer, msc_obj.test_param.msc_scsi_xfer_tag);
                xfer_out->num_bytes = sizeof(mock_msc_bulk_cbw_t);
                xfer_out->bEndpointAddress = MOCK_MSC_SCSI_BULK_OUT_EP_ADDR;
                TEST_ASSERT_EQUAL(ESP_OK, usb_host_transfer_submit(xfer_out));
                //Next stage set from transfer callback
                break;
            }
            case TEST_STAGE_MSC_DATA_DCONN: {
                ESP_LOGD(MSC_CLIENT_TAG, "Data and disconnect");
                //Setup the Data IN transfers
                for (int i = 0; i < msc_obj.num_data_transfers; i++) {
                    xfer_in[i]->num_bytes = usb_round_up_to_mps(MOCK_MSC_SCSI_SECTOR_SIZE, MOCK_MSC_SCSI_BULK_EP_MPS);
                    xfer_in[i]->bEndpointAddress = MOCK_MSC_SCSI_BULK_IN_EP_ADDR;
                }
                //Submit those transfers
                for (int i = 0; i < msc_obj.num_data_transfers; i++) {
                    TEST_ASSERT_EQUAL(ESP_OK, usb_host_transfer_submit(xfer_in[i]));
                }
                //Trigger a disconnect
                test_usb_force_conn_state(false, 0);
                //Next stage set from transfer callback
                break;
            }
            case TEST_STAGE_DEV_CLOSE: {
                ESP_LOGD(MSC_CLIENT_TAG, "Close");
                TEST_ASSERT_EQUAL(ESP_OK, usb_host_interface_release(msc_obj.client_hdl, msc_obj.dev_hdl, MOCK_MSC_SCSI_INTF_NUMBER));
                TEST_ASSERT_EQUAL(ESP_OK, usb_host_device_close(msc_obj.client_hdl, msc_obj.dev_hdl));
                exit_loop = true;
                break;
            }
            default:
                abort();
                break;
        }
    }
    //Free transfers
    TEST_ASSERT_EQUAL(ESP_OK, usb_host_transfer_free(xfer_out));
    for (int i = 0; i < msc_obj.num_data_transfers; i++) {
        TEST_ASSERT_EQUAL(ESP_OK, usb_host_transfer_free(xfer_in[i]));
    }
    //Deregister the client
    TEST_ASSERT_EQUAL(ESP_OK, usb_host_client_deregister(msc_obj.client_hdl));
    ESP_LOGD(MSC_CLIENT_TAG, "Done");
    vTaskDelete(NULL);
}