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/*
 * (c) 2015 flabberast <s3+flabbergast@sdfeu.org>
 *
 * Based on the following work:
 *  - Guillaume Duc's raw hid example (MIT License)
 *    https://github.com/guiduc/usb-hid-chibios-example
 *  - PJRC Teensy examples (MIT License)
 *    https://www.pjrc.com/teensy/usb_keyboard.html
 *  - hasu's TMK keyboard code (GPL v2 and some code Modified BSD)
 *    https://github.com/tmk/tmk_keyboard/
 *  - ChibiOS demo code (Apache 2.0 License)
 *    http://www.chibios.org
 *
 * Since some GPL'd code is used, this work is licensed under
 * GPL v2 or later.
 */

/*
 * Implementation notes:
 *
 * USBEndpointConfig - Configured using explicit order instead of struct member name.
 *   This is due to ChibiOS hal LLD differences, which is dependent on hardware,
 *   "USBv1" devices have `ep_buffers` and "OTGv1" have `in_multiplier`.
 *   Given `USBv1/hal_usb_lld.h` marks the field as "not currently used" this code file
 *   makes the assumption this is safe to avoid littering with preprocessor directives.
 */

#include <ch.h>
#include <hal.h>
#include <string.h>

#include "usb_main.h"

#include "host.h"
#include "debug.h"
#include "suspend.h"
#ifdef SLEEP_LED_ENABLE
#    include "sleep_led.h"
#    include "led.h"
#endif
#include "wait.h"
#include "usb_descriptor.h"
#include "usb_driver.h"

#ifdef NKRO_ENABLE
#    include "keycode_config.h"

extern keymap_config_t keymap_config;
#endif

#ifdef JOYSTICK_ENABLE
#    include "joystick.h"
#endif

/* ---------------------------------------------------------
 *       Global interface variables and declarations
 * ---------------------------------------------------------
 */

#ifndef usb_lld_connect_bus
#    define usb_lld_connect_bus(usbp)
#endif

#ifndef usb_lld_disconnect_bus
#    define usb_lld_disconnect_bus(usbp)
#endif

uint8_t                keyboard_idle __attribute__((aligned(2)))     = 0;
uint8_t                keyboard_protocol __attribute__((aligned(2))) = 1;
uint8_t                keyboard_led_state                            = 0;
volatile uint16_t      keyboard_idle_count                           = 0;
static virtual_timer_t keyboard_idle_timer;
static void            keyboard_idle_timer_cb(void *arg);

report_keyboard_t keyboard_report_sent = {{0}};
#ifdef MOUSE_ENABLE
report_mouse_t mouse_report_blank = {0};
#endif /* MOUSE_ENABLE */
#ifdef EXTRAKEY_ENABLE
uint8_t extra_report_blank[3] = {0};
#endif /* EXTRAKEY_ENABLE */

/* ---------------------------------------------------------
 *            Descriptors and USB driver objects
 * ---------------------------------------------------------
 */

/* HID specific constants */
#define HID_GET_REPORT 0x01
#define HID_GET_IDLE 0x02
#define HID_GET_PROTOCOL 0x03
#define HID_SET_REPORT 0x09
#define HID_SET_IDLE 0x0A
#define HID_SET_PROTOCOL 0x0B

/*
 * Handles the GET_DESCRIPTOR callback
 *
 * Returns the proper descriptor
 */
static const USBDescriptor *usb_get_descriptor_cb(USBDriver *usbp, uint8_t dtype, uint8_t dindex, uint16_t wIndex) {
    (void)usbp;
    static USBDescriptor desc;
    uint16_t             wValue = ((uint16_t)dtype << 8) | dindex;
    desc.ud_string              = NULL;
    desc.ud_size                = get_usb_descriptor(wValue, wIndex, (const void **const) & desc.ud_string);
    if (desc.ud_string == NULL)
        return NULL;
    else
        return &desc;
}

#ifndef KEYBOARD_SHARED_EP
/* keyboard endpoint state structure */
static USBInEndpointState kbd_ep_state;
/* keyboard endpoint initialization structure (IN) - see USBEndpointConfig comment at top of file */
static const USBEndpointConfig kbd_ep_config = {
    USB_EP_MODE_TYPE_INTR, /* Interrupt EP */
    NULL,                  /* SETUP packet notification callback */
    kbd_in_cb,             /* IN notification callback */
    NULL,                  /* OUT notification callback */
    KEYBOARD_EPSIZE,       /* IN maximum packet size */
    0,                     /* OUT maximum packet size */
    &kbd_ep_state,         /* IN Endpoint state */
    NULL,                  /* OUT endpoint state */
    2,                     /* IN multiplier */
    NULL                   /* SETUP buffer (not a SETUP endpoint) */
};
#endif

#if defined(MOUSE_ENABLE) && !defined(MOUSE_SHARED_EP)
/* mouse endpoint state structure */
static USBInEndpointState mouse_ep_state;

/* mouse endpoint initialization structure (IN) - see USBEndpointConfig comment at top of file */
static const USBEndpointConfig mouse_ep_config = {
    USB_EP_MODE_TYPE_INTR, /* Interrupt EP */
    NULL,                  /* SETUP packet notification callback */
    mouse_in_cb,           /* IN notification callback */
    NULL,                  /* OUT notification callback */
    MOUSE_EPSIZE,          /* IN maximum packet size */
    0,                     /* OUT maximum packet size */
    &mouse_ep_state,       /* IN Endpoint state */
    NULL,                  /* OUT endpoint state */
    2,                     /* IN multiplier */
    NULL                   /* SETUP buffer (not a SETUP endpoint) */
};
#endif

#ifdef SHARED_EP_ENABLE
/* shared endpoint state structure */
static USBInEndpointState shared_ep_state;

/* shared endpoint initialization structure (IN) - see USBEndpointConfig comment at top of file */
static const USBEndpointConfig shared_ep_config = {
    USB_EP_MODE_TYPE_INTR, /* Interrupt EP */
    NULL,                  /* SETUP packet notification callback */
    shared_in_cb,          /* IN notification callback */
    NULL,                  /* OUT notification callback */
    SHARED_EPSIZE,         /* IN maximum packet size */
    0,                     /* OUT maximum packet size */
    &shared_ep_state,      /* IN Endpoint state */
    NULL,                  /* OUT endpoint state */
    2,                     /* IN multiplier */
    NULL                   /* SETUP buffer (not a SETUP endpoint) */
};
#endif

#if STM32_USB_USE_OTG1
typedef struct {
    size_t              queue_capacity_in;
    size_t              queue_capacity_out;
    USBInEndpointState  in_ep_state;
    USBOutEndpointState out_ep_state;
    USBInEndpointState  int_ep_state;
    USBEndpointConfig   inout_ep_config;
    USBEndpointConfig   int_ep_config;
    const QMKUSBConfig  config;
    QMKUSBDriver        driver;
} usb_driver_config_t;
#else
typedef struct {
    size_t              queue_capacity_in;
    size_t              queue_capacity_out;
    USBInEndpointState  in_ep_state;
    USBOutEndpointState out_ep_state;
    USBInEndpointState  int_ep_state;
    USBEndpointConfig   in_ep_config;
    USBEndpointConfig   out_ep_config;
    USBEndpointConfig   int_ep_config;
    const QMKUSBConfig  config;
    QMKUSBDriver        driver;
} usb_driver_config_t;
#endif

#if STM32_USB_USE_OTG1
/* Reusable initialization structure - see USBEndpointConfig comment at top of file */
#    define QMK_USB_DRIVER_CONFIG(stream, notification, fixedsize)                                                              \
        {                                                                                                                       \
            .queue_capacity_in = stream##_IN_CAPACITY, .queue_capacity_out = stream##_OUT_CAPACITY,                             \
            .inout_ep_config =                                                                                                  \
                {                                                                                                               \
                    stream##_IN_MODE,      /* Interrupt EP */                                                                   \
                    NULL,                  /* SETUP packet notification callback */                                             \
                    qmkusbDataTransmitted, /* IN notification callback */                                                       \
                    qmkusbDataReceived,    /* OUT notification callback */                                                      \
                    stream##_EPSIZE,       /* IN maximum packet size */                                                         \
                    stream##_EPSIZE,       /* OUT maximum packet size */                                                        \
                    NULL,                  /* IN Endpoint state */                                                              \
                    NULL,                  /* OUT endpoint state */                                                             \
                    2,                     /* IN multiplier */                                                                  \
                    NULL                   /* SETUP buffer (not a SETUP endpoint) */                                            \
                },                                                                                                              \
            .int_ep_config =                                                                                                    \
                {                                                                                                               \
                    USB_EP_MODE_TYPE_INTR,      /* Interrupt EP */                                                              \
                    NULL,                       /* SETUP packet notification callback */                                        \
                    qmkusbInterruptTransmitted, /* IN notification callback */                                                  \
                    NULL,                       /* OUT notification callback */                                                 \
                    CDC_NOTIFICATION_EPSIZE,    /* IN maximum packet size */                                                    \
                    0,                          /* OUT maximum packet size */                                                   \
                    NULL,                       /* IN Endpoint state */                                                         \
                    NULL,                       /* OUT endpoint state */                                                        \
                    2,                          /* IN multiplier */                                                             \
                    NULL,                       /* SETUP buffer (not a SETUP endpoint) */                                       \
                },                                                                                                              \
            .config = {                                                                                                         \
                .usbp        = &USB_DRIVER,                                                                                     \
                .bulk_in     = stream##_IN_EPNUM,                                                                               \
                .bulk_out    = stream##_OUT_EPNUM,                                                                              \
                .int_in      = notification,                                                                                    \
                .in_buffers  = stream##_IN_CAPACITY,                                                                            \
                .out_buffers = stream##_OUT_CAPACITY,                                                                           \
                .in_size     = stream##_EPSIZE,                                                                                 \
                .out_size    = stream##_EPSIZE,                                                                                 \
                .fixed_size  = fixedsize,                                                                                       \
                .ib          = (__attribute__((aligned(4))) uint8_t[BQ_BUFFER_SIZE(stream##_IN_CAPACITY, stream##_EPSIZE)]){},  \
                .ob          = (__attribute__((aligned(4))) uint8_t[BQ_BUFFER_SIZE(stream##_OUT_CAPACITY, stream##_EPSIZE)]){}, \
            }                                                                                                                   \
        }
#else
/* Reusable initialization structure - see USBEndpointConfig comment at top of file */
#    define QMK_USB_DRIVER_CONFIG(stream, notification, fixedsize)                                                              \
        {                                                                                                                       \
            .queue_capacity_in = stream##_IN_CAPACITY, .queue_capacity_out = stream##_OUT_CAPACITY,                             \
            .in_ep_config =                                                                                                     \
                {                                                                                                               \
                    stream##_IN_MODE,      /* Interrupt EP */                                                                   \
                    NULL,                  /* SETUP packet notification callback */                                             \
                    qmkusbDataTransmitted, /* IN notification callback */                                                       \
                    NULL,                  /* OUT notification callback */                                                      \
                    stream##_EPSIZE,       /* IN maximum packet size */                                                         \
                    0,                     /* OUT maximum packet size */                                                        \
                    NULL,                  /* IN Endpoint state */                                                              \
                    NULL,                  /* OUT endpoint state */                                                             \
                    2,                     /* IN multiplier */                                                                  \
                    NULL                   /* SETUP buffer (not a SETUP endpoint) */                                            \
                },                                                                                                              \
            .out_ep_config =                                                                                                    \
                {                                                                                                               \
                    stream##_OUT_MODE,  /* Interrupt EP */                                                                      \
                    NULL,               /* SETUP packet notification callback */                                                \
                    NULL,               /* IN notification callback */                                                          \
                    qmkusbDataReceived, /* OUT notification callback */                                                         \
                    0,                  /* IN maximum packet size */                                                            \
                    stream##_EPSIZE,    /* OUT maximum packet size */                                                           \
                    NULL,               /* IN Endpoint state */                                                                 \
                    NULL,               /* OUT endpoint state */                                                                \
                    2,                  /* IN multiplier */                                                                     \
                    NULL,               /* SETUP buffer (not a SETUP endpoint) */                                               \
                },                                                                                                              \
            .int_ep_config =                                                                                                    \
                {                                                                                                               \
                    USB_EP_MODE_TYPE_INTR,      /* Interrupt EP */                                                              \
                    NULL,                       /* SETUP packet notification callback */                                        \
                    qmkusbInterruptTransmitted, /* IN notification callback */                                                  \
                    NULL,                       /* OUT notification callback */                                                 \
                    CDC_NOTIFICATION_EPSIZE,    /* IN maximum packet size */                                                    \
                    0,                          /* OUT maximum packet size */                                                   \
                    NULL,                       /* IN Endpoint state */                                                         \
                    NULL,                       /* OUT endpoint state */                                                        \
                    2,                          /* IN multiplier */                                                             \
                    NULL,                       /* SETUP buffer (not a SETUP endpoint) */                                       \
                },                                                                                                              \
            .config = {                                                                                                         \
                .usbp        = &USB_DRIVER,                                                                                     \
                .bulk_in     = stream##_IN_EPNUM,                                                                               \
                .bulk_out    = stream##_OUT_EPNUM,                                                                              \
                .int_in      = notification,                                                                                    \
                .in_buffers  = stream##_IN_CAPACITY,                                                                            \
                .out_buffers = stream##_OUT_CAPACITY,                                                                           \
                .in_size     = stream##_EPSIZE,                                                                                 \
                .out_size    = stream##_EPSIZE,                                                                                 \
                .fixed_size  = fixedsize,                                                                                       \
                .ib          = (__attribute__((aligned(4))) uint8_t[BQ_BUFFER_SIZE(stream##_IN_CAPACITY, stream##_EPSIZE)]){},  \
                .ob          = (__attribute__((aligned(4))) uint8_t[BQ_BUFFER_SIZE(stream##_OUT_CAPACITY, stream##_EPSIZE)]){}, \
            }                                                                                                                   \
        }
#endif

typedef struct {
    union {
        struct {
#ifdef CONSOLE_ENABLE
            usb_driver_config_t console_driver;
#endif
#ifdef RAW_ENABLE
            usb_driver_config_t raw_driver;
#endif
#ifdef MIDI_ENABLE
            usb_driver_config_t midi_driver;
#endif
#ifdef VIRTSER_ENABLE
            usb_driver_config_t serial_driver;
#endif
#ifdef JOYSTICK_ENABLE
            usb_driver_config_t joystick_driver;
#endif
        };
        usb_driver_config_t array[0];
    };
} usb_driver_configs_t;

static usb_driver_configs_t drivers = {
#ifdef CONSOLE_ENABLE
#    define CONSOLE_IN_CAPACITY 4
#    define CONSOLE_OUT_CAPACITY 4
#    define CONSOLE_IN_MODE USB_EP_MODE_TYPE_INTR
#    define CONSOLE_OUT_MODE USB_EP_MODE_TYPE_INTR
    .console_driver = QMK_USB_DRIVER_CONFIG(CONSOLE, 0, true),
#endif
#ifdef RAW_ENABLE
#    define RAW_IN_CAPACITY 4
#    define RAW_OUT_CAPACITY 4
#    define RAW_IN_MODE USB_EP_MODE_TYPE_INTR
#    define RAW_OUT_MODE USB_EP_MODE_TYPE_INTR
    .raw_driver = QMK_USB_DRIVER_CONFIG(RAW, 0, false),
#endif

#ifdef MIDI_ENABLE
#    define MIDI_STREAM_IN_CAPACITY 4
#    define MIDI_STREAM_OUT_CAPACITY 4
#    define MIDI_STREAM_IN_MODE USB_EP_MODE_TYPE_BULK
#    define MIDI_STREAM_OUT_MODE USB_EP_MODE_TYPE_BULK
    .midi_driver = QMK_USB_DRIVER_CONFIG(MIDI_STREAM, 0, false),
#endif

#ifdef VIRTSER_ENABLE
#    define CDC_IN_CAPACITY 4
#    define CDC_OUT_CAPACITY 4
#    define CDC_IN_MODE USB_EP_MODE_TYPE_BULK
#    define CDC_OUT_MODE USB_EP_MODE_TYPE_BULK
    .serial_driver = QMK_USB_DRIVER_CONFIG(CDC, CDC_NOTIFICATION_EPNUM, false),
#endif

#ifdef JOYSTICK_ENABLE
#    define JOYSTICK_IN_CAPACITY 4
#    define JOYSTICK_OUT_CAPACITY 4
#    define JOYSTICK_IN_MODE USB_EP_MODE_TYPE_BULK
#    define JOYSTICK_OUT_MODE USB_EP_MODE_TYPE_BULK
    .joystick_driver = QMK_USB_DRIVER_CONFIG(JOYSTICK, 0, false),
#endif
};

#define NUM_USB_DRIVERS (sizeof(drivers) / sizeof(usb_driver_config_t))

/* ---------------------------------------------------------
 *                  USB driver functions
 * ---------------------------------------------------------
 */

#define USB_EVENT_QUEUE_SIZE 16
usbevent_t event_queue[USB_EVENT_QUEUE_SIZE];
uint8_t    event_queue_head;
uint8_t    event_queue_tail;

void usb_event_queue_init(void) {
    // Initialise the event queue
    memset(&event_queue, 0, sizeof(event_queue));
    event_queue_head = 0;
    event_queue_tail = 0;
}

static inline bool usb_event_queue_enqueue(usbevent_t event) {
    uint8_t next = (event_queue_head + 1) % USB_EVENT_QUEUE_SIZE;
    if (next == event_queue_tail) {
        return false;
    }
    event_queue[event_queue_head] = event;
    event_queue_head              = next;
    return true;
}

static inline bool usb_event_queue_dequeue(usbevent_t *event) {
    if (event_queue_head == event_queue_tail) {
        return false;
    }
    *event           = event_queue[event_queue_tail];
    event_queue_tail = (event_queue_tail + 1) % USB_EVENT_QUEUE_SIZE;
    return true;
}

static inline void usb_event_suspend_handler(void) {
#ifdef SLEEP_LED_ENABLE
    sleep_led_enable();
#endif /* SLEEP_LED_ENABLE */
}

static inline void usb_event_wakeup_handler(void) {
    suspend_wakeup_init();
#ifdef SLEEP_LED_ENABLE
    sleep_led_disable();
    // NOTE: converters may not accept this
    led_set(host_keyboard_leds());
#endif /* SLEEP_LED_ENABLE */
}

void usb_event_queue_task(void) {
    usbevent_t event;
    while (usb_event_queue_dequeue(&event)) {
        switch (event) {
            case USB_EVENT_SUSPEND:
                usb_event_suspend_handler();
                break;
            case USB_EVENT_WAKEUP:
                usb_event_wakeup_handler();
                break;
            default:
                // Nothing to do, we don't handle it.
                break;
        }
    }
}

/* Handles the USB driver global events
 * TODO: maybe disable some things when connection is lost? */
static void usb_event_cb(USBDriver *usbp, usbevent_t event) {
    switch (event) {
        case USB_EVENT_ADDRESS:
            return;

        case USB_EVENT_CONFIGURED:
            osalSysLockFromISR();
            /* Enable the endpoints specified into the configuration. */
#ifndef KEYBOARD_SHARED_EP
            usbInitEndpointI(usbp, KEYBOARD_IN_EPNUM, &kbd_ep_config);
#endif
#if defined(MOUSE_ENABLE) && !defined(MOUSE_SHARED_EP)
            usbInitEndpointI(usbp, MOUSE_IN_EPNUM, &mouse_ep_config);
#endif
#ifdef SHARED_EP_ENABLE
            usbInitEndpointI(usbp, SHARED_IN_EPNUM, &shared_ep_config);
#endif
            for (int i = 0; i < NUM_USB_DRIVERS; i++) {
#if STM32_USB_USE_OTG1
                usbInitEndpointI(usbp, drivers.array[i].config.bulk_in, &drivers.array[i].inout_ep_config);
#else
                usbInitEndpointI(usbp, drivers.array[i].config.bulk_in, &drivers.array[i].in_ep_config