//! High Resolution Timer (HRTIM)

mod traits;

use core::marker::PhantomData;

use embassy_hal_internal::Peri;
pub use traits::Instance;

use crate::gpio::{AfType, AnyPin, OutputType, Speed};
use crate::rcc;
use crate::time::Hertz;
pub use crate::timer::simple_pwm::PwmPinConfig;

/// HRTIM burst controller instance.
pub struct BurstController<T: Instance> {
    phantom: PhantomData<T>,
}

/// HRTIM master instance.
pub struct Master<T: Instance> {
    phantom: PhantomData<T>,
}

/// HRTIM channel A instance.
pub struct ChA<T: Instance> {
    phantom: PhantomData<T>,
}

/// HRTIM channel B instance.
pub struct ChB<T: Instance> {
    phantom: PhantomData<T>,
}

/// HRTIM channel C instance.
pub struct ChC<T: Instance> {
    phantom: PhantomData<T>,
}

/// HRTIM channel D instance.
pub struct ChD<T: Instance> {
    phantom: PhantomData<T>,
}

/// HRTIM channel E instance.
pub struct ChE<T: Instance> {
    phantom: PhantomData<T>,
}

/// HRTIM channel F instance.
#[cfg(hrtim_v2)]
pub struct ChF<T: Instance> {
    phantom: PhantomData<T>,
}

trait SealedAdvancedChannel<T: Instance> {
    fn raw() -> usize;
}

/// Advanced channel instance trait.
#[allow(private_bounds)]
pub trait AdvancedChannel<T: Instance>: SealedAdvancedChannel<T> {}

/// HRTIM PWM pin.
pub struct PwmPin<'d, T, C> {
    _pin: Peri<'d, AnyPin>,
    phantom: PhantomData<(T, C)>,
}

/// HRTIM complementary PWM pin.
pub struct ComplementaryPwmPin<'d, T, C> {
    _pin: Peri<'d, AnyPin>,
    phantom: PhantomData<(T, C)>,
}

macro_rules! advanced_channel_impl {
    ($new_chx:ident, $new_chx_with_config:ident, $channel:tt, $ch_num:expr, $pin_trait:ident, $complementary_pin_trait:ident) => {
        impl<'d, T: Instance> PwmPin<'d, T, $channel<T>> {
            #[doc = concat!("Create a new ", stringify!($channel), " PWM pin instance.")]
            pub fn $new_chx(pin: Peri<'d, impl $pin_trait<T>>) -> Self {
                critical_section::with(|_| {
                    pin.set_low();
                    set_as_af!(pin, AfType::output(OutputType::PushPull, Speed::VeryHigh));
                });
                PwmPin {
                    _pin: pin.into(),
                    phantom: PhantomData,
                }
            }

            #[doc = concat!("Create a new ", stringify!($channel), " PWM pin instance with a specific configuration.")]
            pub fn $new_chx_with_config(
                pin: Peri<'d, impl $pin_trait<T>>,
                pin_config: PwmPinConfig,
            ) -> Self {
                critical_section::with(|_| {
                    pin.set_low();
                    set_as_af!(pin, AfType::output(pin_config.output_type, pin_config.speed));
                });
                PwmPin {
                    _pin: pin.into(),
                    phantom: PhantomData,
                }
            }
        }

        impl<'d, T: Instance> ComplementaryPwmPin<'d, T, $channel<T>> {
            #[doc = concat!("Create a new ", stringify!($channel), " complementary PWM pin instance.")]
            pub fn $new_chx(pin: Peri<'d, impl $complementary_pin_trait<T>>) -> Self {
                critical_section::with(|_| {
                    pin.set_low();
                    set_as_af!(pin, AfType::output(OutputType::PushPull, Speed::VeryHigh));
                });
                ComplementaryPwmPin {
                    _pin: pin.into(),
                    phantom: PhantomData,
                }
            }

            #[doc = concat!("Create a new ", stringify!($channel), " complementary PWM pin instance with a specific configuration.")]
            pub fn $new_chx_with_config(
                pin: Peri<'d, impl $complementary_pin_trait<T>>,
                pin_config: PwmPinConfig,
            ) -> Self {
                critical_section::with(|_| {
                    pin.set_low();
                    set_as_af!(pin, AfType::output(pin_config.output_type, pin_config.speed));
                });
                ComplementaryPwmPin {
                    _pin: pin.into(),
                    phantom: PhantomData,
                }
            }
        }

        impl<T: Instance> SealedAdvancedChannel<T> for $channel<T> {
            fn raw() -> usize {
                $ch_num
            }
        }
        impl<T: Instance> AdvancedChannel<T> for $channel<T> {}
    };
}

advanced_channel_impl!(
    new_cha,
    new_cha_with_config,
    ChA,
    0,
    ChannelAPin,
    ChannelAComplementaryPin
);
advanced_channel_impl!(
    new_chb,
    new_chb_with_config,
    ChB,
    1,
    ChannelBPin,
    ChannelBComplementaryPin
);
advanced_channel_impl!(
    new_chc,
    new_chc_with_config,
    ChC,
    2,
    ChannelCPin,
    ChannelCComplementaryPin
);
advanced_channel_impl!(
    new_chd,
    new_chd_with_config,
    ChD,
    3,
    ChannelDPin,
    ChannelDComplementaryPin
);
advanced_channel_impl!(
    new_che,
    new_che_with_config,
    ChE,
    4,
    ChannelEPin,
    ChannelEComplementaryPin
);
#[cfg(hrtim_v2)]
advanced_channel_impl!(
    new_chf,
    new_chf_with_config,
    ChF,
    5,
    ChannelFPin,
    ChannelFComplementaryPin
);

/// Struct used to divide a high resolution timer into multiple channels
pub struct AdvancedPwm<'d, T: Instance> {
    _inner: Peri<'d, T>,
    /// Master instance.
    pub master: Master<T>,
    /// Burst controller.
    pub burst_controller: BurstController<T>,
    /// Channel A.
    pub ch_a: ChA<T>,
    /// Channel B.
    pub ch_b: ChB<T>,
    /// Channel C.
    pub ch_c: ChC<T>,
    /// Channel D.
    pub ch_d: ChD<T>,
    /// Channel E.
    pub ch_e: ChE<T>,
    /// Channel F.
    #[cfg(hrtim_v2)]
    pub ch_f: ChF<T>,
}

impl<'d, T: Instance> AdvancedPwm<'d, T> {
    /// Create a new HRTIM driver.
    ///
    /// This splits the HRTIM into its constituent parts, which you can then use individually.
    pub fn new(
        tim: Peri<'d, T>,
        _cha: Option<PwmPin<'d, T, ChA<T>>>,
        _chan: Option<ComplementaryPwmPin<'d, T, ChA<T>>>,
        _chb: Option<PwmPin<'d, T, ChB<T>>>,
        _chbn: Option<ComplementaryPwmPin<'d, T, ChB<T>>>,
        _chc: Option<PwmPin<'d, T, ChC<T>>>,
        _chcn: Option<ComplementaryPwmPin<'d, T, ChC<T>>>,
        _chd: Option<PwmPin<'d, T, ChD<T>>>,
        _chdn: Option<ComplementaryPwmPin<'d, T, ChD<T>>>,
        _che: Option<PwmPin<'d, T, ChE<T>>>,
        _chen: Option<ComplementaryPwmPin<'d, T, ChE<T>>>,
        #[cfg(hrtim_v2)] _chf: Option<PwmPin<'d, T, ChF<T>>>,
        #[cfg(hrtim_v2)] _chfn: Option<ComplementaryPwmPin<'d, T, ChF<T>>>,
    ) -> Self {
        Self::new_inner(tim)
    }

    fn new_inner(tim: Peri<'d, T>) -> Self {
        rcc::enable_and_reset::<T>();

        #[cfg(stm32f334)]
        if crate::pac::RCC.cfgr3().read().hrtim1sw() == crate::pac::rcc::vals::Timsw::PLL1_P {
            // Enable and and stabilize the DLL
            T::regs().dllcr().modify(|w| {
                w.set_cal(true);
            });

            trace!("hrtim: wait for dll calibration");
            while !T::regs().isr().read().dllrdy() {}

            trace!("hrtim: dll calibration complete");

            // Enable periodic calibration
            // Cal must be disabled before we can enable it
            T::regs().dllcr().modify(|w| {
                w.set_cal(false);
            });

            T::regs().dllcr().modify(|w| {
                w.set_calen(true);
                w.set_calrte(11);
            });
        }

        Self {
            _inner: tim,
            master: Master { phantom: PhantomData },
            burst_controller: BurstController { phantom: PhantomData },
            ch_a: ChA { phantom: PhantomData },
            ch_b: ChB { phantom: PhantomData },
            ch_c: ChC { phantom: PhantomData },
            ch_d: ChD { phantom: PhantomData },
            ch_e: ChE { phantom: PhantomData },
            #[cfg(hrtim_v2)]
            ch_f: ChF { phantom: PhantomData },
        }
    }
}

/// Fixed-frequency bridge converter driver.
///
/// Our implementation of the bridge converter uses a single channel and three compare registers,
/// allowing implementation of a synchronous buck or boost converter in continuous or discontinuous
/// conduction mode.
///
/// It is important to remember that in synchronous topologies, energy can flow in reverse during
/// light loading conditions, and that the low-side switch must be active for a short time to drive
/// a bootstrapped high-side switch.
pub struct BridgeConverter<T: Instance, C: AdvancedChannel<T>> {
    timer: PhantomData<T>,
    channel: PhantomData<C>,
    dead_time: u16,
    primary_duty: u16,
    min_secondary_duty: u16,
    max_secondary_duty: u16,
}

impl<T: Instance, C: AdvancedChannel<T>> BridgeConverter<T, C> {
    /// Create a new HRTIM bridge converter driver.
    pub fn new(_channel: C, frequency: Hertz) -> Self {
        T::set_channel_frequency(C::raw(), frequency);

        // Always enable preload
        T::regs().tim(C::raw()).cr().modify(|w| {
            w.set_preen(true);
            w.set_repu(true);
            w.set_cont(true);
        });

        // Enable timer outputs
        T::regs().oenr().modify(|w| {
            w.set_t1oen(C::raw(), true);
            w.set_t2oen(C::raw(), true);
        });

        // The dead-time generation unit cannot be used because it forces the other output
        // to be completely complementary to the first output, which restricts certain waveforms
        // Therefore, software-implemented dead time must be used when setting the duty cycles

        // Set output 1 to active on a period event
        T::regs().tim(C::raw()).setr(0).modify(|w| w.set_per(true));

        // Set output 1 to inactive on a compare 1 event
        T::regs().tim(C::raw()).rstr(0).modify(|w| w.set_cmp(0, true));

        // Set output 2 to active on a compare 2 event
        T::regs().tim(C::raw()).setr(1).modify(|w| w.set_cmp(1, true));

        // Set output 2 to inactive on a compare 3 event
        T::regs().tim(C::raw()).rstr(1).modify(|w| w.set_cmp(2, true));

        Self {
            timer: PhantomData,
            channel: PhantomData,
            dead_time: 0,
            primary_duty: 0,
            min_secondary_duty: 0,
            max_secondary_duty: 0,
        }
    }

    /// Start HRTIM.
    pub fn start(&mut self) {
        T::regs().mcr().modify(|w| w.set_tcen(C::raw(), true));
    }

    /// Stop HRTIM.
    pub fn stop(&mut self) {
        T::regs().mcr().modify(|w| w.set_tcen(C::raw(), false));
    }

    /// Enable burst mode.
    pub fn enable_burst_mode(&mut self) {
        T::regs().tim(C::raw()).outr().modify(|w| {
            // Enable Burst Mode
            w.set_idlem(0, true);
            w.set_idlem(1, true);

            // Set output to active during the burst
            w.set_idles(0, true);
            w.set_idles(1, true);
        })
    }

    /// Disable burst mode.
    pub fn disable_burst_mode(&mut self) {
        T::regs().tim(C::raw()).outr().modify(|w| {
            // Disable Burst Mode
            w.set_idlem(0, false);
            w.set_idlem(1, false);
        })
    }

    fn update_primary_duty_or_dead_time(&mut self) {
        self.min_secondary_duty = self.primary_duty + self.dead_time;

        T::regs().tim(C::raw()).cmp(0).modify(|w| w.set_cmp(self.primary_duty));
        T::regs()
            .tim(C::raw())
            .cmp(1)
            .modify(|w| w.set_cmp(self.min_secondary_duty));
    }

    /// Set the dead time as a proportion of the maximum compare value
    pub fn set_dead_time(&mut self, dead_time: u16) {
        self.dead_time = dead_time;
        self.max_secondary_duty = self.get_max_compare_value() - dead_time;
        self.update_primary_duty_or_dead_time();
    }

    /// Get the maximum compare value of a duty cycle
    pub fn get_max_compare_value(&mut self) -> u16 {
        T::regs().tim(C::raw()).per().read().per()
    }

    /// The primary duty is the period in which the primary switch is active
    ///
    /// In the case of a buck converter, this is the high-side switch
    /// In the case of a boost converter, this is the low-side switch
    pub fn set_primary_duty(&mut self, primary_duty: u16) {
        self.primary_duty = primary_duty;
        self.update_primary_duty_or_dead_time();
    }

    /// The secondary duty is the period in any switch is active
    ///
    /// If less than or equal to the primary duty, the secondary switch will be active for one tick
    /// If a fully complementary output is desired, the secondary duty can be set to the max compare
    pub fn set_secondary_duty(&mut self, secondary_duty: u16) {
        let secondary_duty = if secondary_duty > self.max_secondary_duty {
            self.max_secondary_duty
        } else if secondary_duty <= self.min_secondary_duty {
            self.min_secondary_duty + 1
        } else {
            secondary_duty
        };

        T::regs().tim(C::raw()).cmp(2).modify(|w| w.set_cmp(secondary_duty));
    }
}

/// Variable-frequency resonant converter driver.
///
/// This implementation of a resonsant converter is appropriate for a half or full bridge,
/// but does not include secondary rectification, which is appropriate for applications
/// with a low-voltage on the secondary side.
pub struct ResonantConverter<T: Instance, C: AdvancedChannel<T>> {
    timer: PhantomData<T>,
    channel: PhantomData<C>,
    min_period: u16,
    max_period: u16,
}

impl<T: Instance, C: AdvancedChannel<T>> ResonantConverter<T, C> {
    /// Create a new variable-frequency resonant converter driver.
    pub fn new(_channel: C, min_frequency: Hertz, max_frequency: Hertz) -> Self {
        T::set_channel_frequency(C::raw(), min_frequency);

        // Always enable preload
        T::regs().tim(C::raw()).cr().modify(|w| {
            w.set_preen(true);
            w.set_repu(true);

            w.set_cont(true);
            w.set_half(true);
        });

        // Enable timer outputs
        T::regs().oenr().modify(|w| {
            w.set_t1oen(C::raw(), true);
            w.set_t2oen(C::raw(), true);
        });

        // Dead-time generator can be used in this case because the primary fets
        // of a resonant converter are always complementary
        T::regs().tim(C::raw()).outr().modify(|w| w.set_dten(true));

        let max_period = T::regs().tim(C::raw()).per().read().per();
        let min_period = max_period * (min_frequency.0 / max_frequency.0) as u16;

        Self {
            timer: PhantomData,
            channel: PhantomData,
            min_period: min_period,
            max_period: max_period,
        }
    }

    /// Set the dead time as a proportion of the maximum compare value
    pub fn set_dead_time(&mut self, value: u16) {
        T::set_channel_dead_time(C::raw(), value);
    }

    /// Set the timer period.
    pub fn set_period(&mut self, period: u16) {
        assert!(period < self.max_period);
        assert!(period > self.min_period);

        T::regs().tim(C::raw()).per().modify(|w| w.set_per(period));
    }

    /// Get the minimum compare value of a duty cycle
    pub fn get_min_period(&mut self) -> u16 {
        self.min_period
    }

    /// Get the maximum compare value of a duty cycle
    pub fn get_max_period(&mut self) -> u16 {
        self.max_period
    }
}

pin_trait!(ChannelAPin, Instance);
pin_trait!(ChannelAComplementaryPin, Instance);
pin_trait!(ChannelBPin, Instance);
pin_trait!(ChannelBComplementaryPin, Instance);
pin_trait!(ChannelCPin, Instance);
pin_trait!(ChannelCComplementaryPin, Instance);
pin_trait!(ChannelDPin, Instance);
pin_trait!(ChannelDComplementaryPin, Instance);
pin_trait!(ChannelEPin, Instance);
pin_trait!(ChannelEComplementaryPin, Instance);
#[cfg(hrtim_v2)]
pin_trait!(ChannelFPin, Instance);
#[cfg(hrtim_v2)]
pin_trait!(ChannelFComplementaryPin, Instance);
