#pragma once

#include <AP_HAL/AP_HAL_Boards.h>

#ifndef HAL_QUADPLANE_ENABLED
#define HAL_QUADPLANE_ENABLED 1
#endif

#if HAL_QUADPLANE_ENABLED

#include <AP_Motors/AP_Motors.h>
#include <AC_PID/AC_PID.h>
#include <AC_AttitudeControl/AC_AttitudeControl_Multi.h> // Attitude control library
#include <AP_InertialNav/AP_InertialNav.h>
#include <AC_AttitudeControl/AC_PosControl.h>
#include <AC_AttitudeControl/AC_WeatherVane.h>
#include <AC_WPNav/AC_WPNav.h>
#include <AC_WPNav/AC_Loiter.h>
#include <AC_Fence/AC_Fence.h>
#include <AC_Avoidance/AC_Avoid.h>
#include <AP_Proximity/AP_Proximity.h>
#include "qautotune.h"
#include "defines.h"
#include "tailsitter.h"
#include "tiltrotor.h"
#include "transition.h"

/*
  QuadPlane specific functionality
 */
class QuadPlane
{
public:
    friend class Plane;
    friend class AP_Tuning_Plane;
    friend class GCS_MAVLINK_Plane;
    friend class AP_AdvancedFailsafe_Plane;
    friend class QAutoTune;
    friend class AP_Arming_Plane;
    friend class RC_Channel_Plane;
    friend class RC_Channel;
    friend class Tailsitter;
    friend class Tiltrotor;
    friend class SLT_Transition;
    friend class Tailsitter_Transition;

    friend class Mode;
    friend class ModeAuto;
    friend class ModeRTL;
    friend class ModeAvoidADSB;
    friend class ModeGuided;
    friend class ModeQHover;
    friend class ModeQLand;
    friend class ModeQLoiter;
    friend class ModeQRTL;
    friend class ModeQStabilize;
    friend class ModeQAutotune;
    friend class ModeQAcro;
    friend class ModeLoiterAltQLand;
    
    QuadPlane(AP_AHRS &_ahrs);

    static QuadPlane *get_singleton() {
        return _singleton;
    }

    // var_info for holding Parameter information
    static const struct AP_Param::GroupInfo var_info[];
    static const struct AP_Param::GroupInfo var_info2[];

    void control_auto(void);
    bool setup(void);

    void vtol_position_controller(void);
    void setup_target_position(void);
    void takeoff_controller(void);
    void waypoint_controller(void);
    void update_land_positioning(void);

    void update_throttle_mix(void);
    
    // update transition handling
    void update(void);

    // set motor arming
    void set_armed(bool armed);

    // is VTOL available?
    bool available(void) const {
        return initialised;
    }

    // is quadplane assisting?
    bool in_assisted_flight(void) const {
        return available() && assisted_flight;
    }

    /*
      return true if we are in a transition to fwd flight from hover
    */
    bool in_transition(void) const;

    bool handle_do_vtol_transition(enum MAV_VTOL_STATE state) const;

    bool do_vtol_takeoff(const AP_Mission::Mission_Command& cmd);
    bool do_vtol_land(const AP_Mission::Mission_Command& cmd);
    bool verify_vtol_takeoff(const AP_Mission::Mission_Command &cmd);
    bool verify_vtol_land(void);
    bool in_vtol_auto(void) const;
    bool in_vtol_mode(void) const;
    bool in_vtol_takeoff(void) const;
    bool in_vtol_posvel_mode(void) const;
    void update_throttle_hover();
    bool show_vtol_view() const;

    // vtol help for is_flying()
    bool is_flying(void);

    // return desired forward throttle percentage
    float forward_throttle_pct();
    float get_weathervane_yaw_rate_cds(void);

    // see if we are flying from vtol point of view
    bool is_flying_vtol(void) const;

    // user initiated takeoff for guided mode
    bool do_user_takeoff(float takeoff_altitude);

    // return true if the wp_nav controller is being updated
    bool using_wp_nav(void) const;

    // return true if the user has set ENABLE
    bool enabled(void) const { return enable != 0; }
    
    // is throttle controlled landing descent active?
    bool thr_ctrl_land;

    uint16_t get_pilot_velocity_z_max_dn() const;
    
    struct PACKED log_QControl_Tuning {
        LOG_PACKET_HEADER;
        uint64_t time_us;
        float    throttle_in;
        float    angle_boost;
        float    throttle_out;
        float    throttle_hover;
        float    desired_alt;
        float    inav_alt;
        int32_t  baro_alt;
        int16_t  target_climb_rate;
        int16_t  climb_rate;
        float    throttle_mix;
        float    speed_scaler;
        uint8_t  transition_state;
        uint8_t  assist;
    };

    MAV_TYPE get_mav_type(void) const;

    enum Q_ASSIST_STATE_ENUM {
        Q_ASSIST_DISABLED,
        Q_ASSIST_ENABLED,
        Q_ASSIST_FORCE,
    };
    void set_q_assist_state(Q_ASSIST_STATE_ENUM state) {q_assist_state = state;};

    // called when we change mode (for any mode, not just Q modes)
    void mode_enter(void);

private:
    AP_AHRS &ahrs;
    AP_Vehicle::MultiCopter aparm;

    AP_InertialNav inertial_nav{ahrs};

    AP_Enum<AP_Motors::motor_frame_class> frame_class;
    AP_Enum<AP_Motors::motor_frame_type> frame_type;

    // Initialise motors to allow passing it to tailsitter in its constructor
    AP_MotorsMulticopter *motors = nullptr;
    const struct AP_Param::GroupInfo *motors_var_info;

    AC_AttitudeControl_Multi *attitude_control;
    AC_PosControl *pos_control;
    AC_WPNav *wp_nav;
    AC_Loiter *loiter_nav;
    
    // maximum vertical velocity the pilot may request
    AP_Int16 pilot_velocity_z_max_up;
    AP_Int16 pilot_velocity_z_max_dn;

    // vertical acceleration the pilot may request
    AP_Int16 pilot_accel_z;

    // air mode state: OFF, ON, ASSISTED_FLIGHT_ONLY
    AirMode air_mode;

    // return true if airmode should be active
    bool air_mode_active() const;

    // check for quadplane assistance needed
    bool should_assist(float aspeed, bool have_airspeed);

    // update transition handling
    void update_transition(void);

    // check for an EKF yaw reset
    void check_yaw_reset(void);
    
    // hold hover (for transition)
    void hold_hover(float target_climb_rate_cms);

    // hold stabilize (for transition)
    void hold_stabilize(float throttle_in);

    // set climb rate in position controller
    void set_climb_rate_cms(float target_climb_rate_cms, bool force_descend);

    // get pilot desired yaw rate in cd/s
    float get_pilot_input_yaw_rate_cds(void) const;

    // get overall desired yaw rate in cd/s
    float get_desired_yaw_rate_cds(bool weathervane=true);
    
    // get desired climb rate in cm/s
    float get_pilot_desired_climb_rate_cms(void) const;

    // get pilot lean angle
    void get_pilot_desired_lean_angles(float &roll_out_cd, float &pitch_out_cd, float angle_max_cd, float angle_limit_cd) const;

    // get pilot throttle in for landing code. Return value on scale of 0 to 1
    float get_pilot_land_throttle(void) const;

    // initialise throttle_wait when entering mode
    void init_throttle_wait();

    // use multicopter rate controller
    void multicopter_attitude_rate_update(float yaw_rate_cds);

    float get_pilot_throttle(void);
    void control_hover(void);
    void relax_attitude_control();

    bool check_land_complete(void);
    bool land_detector(uint32_t timeout_ms);
    bool check_land_final(void);

    float assist_climb_rate_cms(void) const;

    // calculate desired yaw rate for assistance
    float desired_auto_yaw_rate_cds(void) const;

    bool should_relax(void);
    void motors_output(bool run_rate_controller = true);
    void Log_Write_QControl_Tuning();
    void log_QPOS(void);
    float landing_descent_rate_cms(float height_above_ground);
    
    // setup correct aux channels for frame class
    void setup_default_channels(uint8_t num_motors);

    void guided_start(void);
    void guided_update(void);

    void update_throttle_suppression(void);

    void run_z_controller(void);
    void run_xy_controller(float accel_limit=0.0);

    void setup_defaults(void);

    // calculate a stopping distance for fixed-wing to vtol transitions
    float stopping_distance(float ground_speed_squared) const;
    float accel_needed(float stop_distance, float ground_speed_squared) const;
    float stopping_distance(void);

    // distance below which we don't do approach, based on stopping
    // distance for cruise speed
    float transition_threshold(void);

    AP_Int16 transition_time_ms;
    AP_Int16 back_trans_pitch_limit_ms;

    // transition deceleration, m/s/s
    AP_Float transition_decel;

    // transition failure handling
    struct TRANS_FAIL {
        enum ACTION {
            QLAND,
            QRTL
        };
        AP_Int16 timeout;
        AP_Enum<ACTION> action;
        bool warned;
    } transition_failure;


    // Quadplane trim, degrees
    AP_Float ahrs_trim_pitch;
    float _last_ahrs_trim_pitch;

    // fw landing approach radius
    AP_Float fw_land_approach_radius;

    AP_Int16 rc_speed;

    // speed below which quad assistance is given
    AP_Float assist_speed;

    // angular error at which quad assistance is given
    AP_Int8 assist_angle;
    uint32_t angle_error_start_ms;
    AP_Float assist_delay;

    // altitude to trigger assistance
    AP_Int16 assist_alt;
    uint32_t alt_error_start_ms;
    bool in_alt_assist;

    // maximum yaw rate in degrees/second
    AP_Float yaw_rate_max;

    // landing speed in cm/s
    AP_Int16 land_speed_cms;

    // QRTL start altitude, meters
    AP_Int16 qrtl_alt;
    
    // alt to switch to QLAND_FINAL
    AP_Float land_final_alt;
    AP_Float vel_forward_alt_cutoff;
    
    AP_Int8 enable;
    AP_Int8 transition_pitch_max;

    // control if a VTOL RTL will be used
    AP_Int8 rtl_mode;
    enum RTL_MODE{
        NONE,
        SWITCH_QRTL,
        VTOL_APPROACH_QRTL,
        QRTL_ALWAYS,
    };

    // control if a VTOL GUIDED will be used
    AP_Int8 guided_mode;

    // control ESC throttle calibration
    AP_Int8 esc_calibration;
    void run_esc_calibration(void);

    // ICEngine control on landing
    AP_Int8 land_icengine_cut;

    // HEARTBEAT mav_type override
    AP_Int8 mav_type;

    // manual throttle curve expo strength
    AP_Float throttle_expo;

    // manual forward throttle input
    AP_Float fwd_thr_max;
    RC_Channel *rc_fwd_thr_ch;

    // QACRO mode max roll/pitch/yaw rates
    AP_Float acro_roll_rate;
    AP_Float acro_pitch_rate;
    AP_Float acro_yaw_rate;

    // time we last got an EKF yaw reset
    uint32_t ekfYawReset_ms;

    struct {
        AP_Float gain;
        float integrator;
        uint32_t last_ms;
        float last_pct;
    } vel_forward;

    AC_WeatherVane *weathervane;

    bool initialised;

    Location last_auto_target;

    // when did we last run the attitude controller?
    uint32_t last_att_control_ms;

    // transition logic
    Transition *transition = nullptr;

    // true when waiting for pilot throttle
    bool throttle_wait:1;

    // true when quad is assisting a fixed wing mode
    bool assisted_flight:1;

    // true when in angle assist
    bool in_angle_assist:1;

    // are we in a guided takeoff?
    bool guided_takeoff:1;

    struct {
        // time when motors reached lower limit
        uint32_t lower_limit_start_ms;
        uint32_t land_start_ms;
        float vpos_start_m;

        // landing detection threshold in meters
        AP_Float detect_alt_change;
    } landing_detect;

    // throttle mix acceleration filter
    LowPassFilterVector3f throttle_mix_accel_ef_filter{1.0};

    // time we last set the loiter target
    uint32_t last_loiter_ms;

    enum position_control_state {
        QPOS_NONE = 0,
        QPOS_APPROACH,
        QPOS_AIRBRAKE,
        QPOS_POSITION1,
        QPOS_POSITION2,
        QPOS_LAND_DESCEND,
        QPOS_LAND_FINAL,
        QPOS_LAND_COMPLETE
    };
    class PosControlState {
    public:
        enum position_control_state get_state() const {
            return state;
        }
        void set_state(enum position_control_state s);
        uint32_t time_since_state_start_ms() const {
            return AP_HAL::millis() - last_state_change_ms;
        }
        Vector3p target_cm;
        Vector2f xy_correction;
        Vector3f target_vel_cms;
        bool slow_descent:1;
        bool pilot_correction_active;
        bool pilot_correction_done;
        uint32_t thrust_loss_start_ms;
        uint32_t last_log_ms;
        bool reached_wp_speed;
        uint32_t last_run_ms;
        float pos1_speed_limit;
        bool done_accel_init;
        Vector2f velocity_match;
        uint32_t last_velocity_match_ms;
        float target_speed;
        float target_accel;
        uint32_t last_pos_reset_ms;
    private:
        uint32_t last_state_change_ms;
        enum position_control_state state;
    } poscontrol;

    struct {
        bool running;
        uint32_t start_ms;            // system time the motor test began
        uint32_t timeout_ms = 0;      // test will timeout this many milliseconds after the motor_test_start_ms
        uint8_t seq = 0;              // motor sequence number of motor being tested
        uint8_t throttle_type = 0;    // motor throttle type (0=throttle percentage, 1=PWM, 2=pilot throttle channel pass-through)
        uint16_t throttle_value = 0;  // throttle to be sent to motor, value depends upon it's type
        uint8_t motor_count;          // number of motors to cycle
    } motor_test;

    // time of last control log message
    uint32_t last_ctrl_log_ms;

    // time of last QTUN log message
    uint32_t last_qtun_log_ms;

    // Tiltrotor control
    Tiltrotor tiltrotor{*this, motors};

    // tailsitter control
    Tailsitter tailsitter{*this, motors};

    // the attitude view of the VTOL attitude controller
    AP_AHRS_View *ahrs_view;

    // time when motors were last active
    uint32_t last_motors_active_ms;

    // time when we last ran the vertical accel controller
    uint32_t last_pidz_active_ms;
    uint32_t last_pidz_init_ms;

    // throttle scailing for vectored motors in FW flighy
    float FW_vector_throttle_scaling(void);

    void afs_terminate(void);
    bool guided_mode_enabled(void);

    // set altitude target to current altitude
    void set_alt_target_current(void);

    // additional options
    AP_Int32 options;
    enum {
        OPTION_LEVEL_TRANSITION=(1<<0),
        OPTION_ALLOW_FW_TAKEOFF=(1<<1),
        OPTION_ALLOW_FW_LAND=(1<<2),
        OPTION_RESPECT_TAKEOFF_FRAME=(1<<3),
        OPTION_MISSION_LAND_FW_APPROACH=(1<<4),
        OPTION_FS_QRTL=(1<<5),
        OPTION_IDLE_GOV_MANUAL=(1<<6),
        OPTION_Q_ASSIST_FORCE_ENABLE=(1<<7),
        OPTION_TAILSIT_Q_ASSIST_MOTORS_ONLY=(1<<8),
        OPTION_AIRMODE_UNUSED=(1<<9),
        OPTION_DISARMED_TILT=(1<<10),
        OPTION_DELAY_ARMING=(1<<11),
        OPTION_DISABLE_SYNTHETIC_AIRSPEED_ASSIST=(1<<12),
        OPTION_DISABLE_GROUND_EFFECT_COMP=(1<<13),
        OPTION_INGORE_FW_ANGLE_LIMITS_IN_Q_MODES=(1<<14),
        OPTION_THR_LANDING_CONTROL=(1<<15),
        OPTION_DISABLE_APPROACH=(1<<16),
        OPTION_REPOSITION_LANDING=(1<<17),
        OPTION_ONLY_ARM_IN_QMODE_OR_AUTO=(1<<18),
        OPTION_TRANS_FAIL_TO_FW=(1<<19),
    };

    AP_Float takeoff_failure_scalar;
    AP_Float maximum_takeoff_airspeed;
    uint32_t takeoff_start_time_ms;
    uint32_t takeoff_time_limit_ms;

    float last_land_final_agl;


    // oneshot with duration ARMING_DELAY_MS used by quadplane to delay spoolup after arming:
    // ignored unless OPTION_DELAY_ARMING or OPTION_TILT_DISARMED is set
    bool delay_arming;

    /*
      return true if current mission item is a vtol takeoff
     */
    bool is_vtol_takeoff(uint16_t id) const;

    /*
      return true if current mission item is a vtol landing
     */
    bool is_vtol_land(uint16_t id) const;

#if QAUTOTUNE_ENABLED
    // qautotune mode
    QAutoTune qautotune;
#endif

    /*
      are we in the approach phase of a VTOL landing?
     */
    bool in_vtol_land_approach(void) const;

    /*
      are we in the descent phase of a VTOL landing?
     */
    bool in_vtol_land_descent(void) const;

    /*
      are we in the final landing phase of a VTOL landing?
     */
    bool in_vtol_land_final(void) const;

    /*
      are we in any of the phases of a VTOL landing?
     */
    bool in_vtol_land_sequence(void) const;

    /*
      see if we are in the VTOL position control phase of a landing
    */
    bool in_vtol_land_poscontrol(void) const;

    /*
      are we in the airbrake phase of a VTOL landing?
     */
    bool in_vtol_airbrake(void) const;
    
    // Q assist state, can be enabled, disabled or force. Default to enabled
    Q_ASSIST_STATE_ENUM q_assist_state = Q_ASSIST_STATE_ENUM::Q_ASSIST_ENABLED;

    /*
      return true if we should use the fixed wing attitude control loop
     */
    bool use_fw_attitude_controllers(void) const;

    /*
      get the airspeed for landing approach
     */
    float get_land_airspeed(void);

    /*
      setup for landing approach
     */
    void poscontrol_init_approach(void);

    /*
      calculate our closing velocity vector on the landing
      point. Takes account of the landing point having a velocity
     */
    Vector2f landing_closing_velocity();

    /*
      calculate our desired closing velocity vector on the landing point.
    */
    Vector2f landing_desired_closing_velocity();

    /*
      change spool state, providing easy hook for catching changes in debug
     */
    void set_desired_spool_state(AP_Motors::DesiredSpoolState state);

    /*
      get a scaled Q_WP_SPEED based on direction of movement
     */
    float get_scaled_wp_speed(float target_bearing_deg) const;

public:
    void motor_test_output();
    MAV_RESULT mavlink_motor_test_start(mavlink_channel_t chan, uint8_t motor_seq, uint8_t throttle_type,
                                        uint16_t throttle_value, float timeout_sec,
                                        uint8_t motor_count);
private:
    void motor_test_stop();

    static QuadPlane *_singleton;
};

#endif  // HAL_QUADPLANE_ENABLED