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use super::*;

const FRAME_SIZE: usize = 10;

#[derive(Default)]
pub struct FrameBuilder {
    bytes: [u8; FRAME_SIZE],
}
impl FrameBuilder {
    #[must_use]
    pub fn new() -> Self {
        let mut builder = Self {
            bytes: [0; FRAME_SIZE],
        };

        builder.version(FrameVersion::Standard);

        builder
    }

    #[must_use]
    pub fn build(&self) -> Frame {
        Frame::new(self.bytes().to_vec())
    }
}
impl FrameBuilderTrait for FrameBuilder {
    fn bytes(&self) -> &[u8] {
        &self.bytes
    }

    fn bytes_mut(&mut self) -> &mut [u8] {
        &mut self.bytes
    }
}

pub trait FrameBuilderTrait {
    fn bytes(&self) -> &[u8];
    fn bytes_mut(&mut self) -> &mut [u8];

    fn version(&mut self, version: FrameVersion) {
        self.bytes_mut()[0] = (self.bytes()[0] & !0b0000_0011) | (0b0000_0011 & version.into_u8());
    }

    fn type_(&mut self, type_: FrameType) {
        self.bytes_mut()[0] =
            (self.bytes()[0] & !0b0000_1100) | (0b0000_1100 & (type_.into_u8() << 2));
    }

    fn subtype(&mut self, subtype: FrameSubtype) {
        self.bytes_mut()[0] =
            (self.bytes()[0] & !0b1111_0000) | (0b1111_0000 & (subtype.into_u8() << 4));
    }

    fn to_ds(&mut self, to_ds: bool) {
        self.bytes_mut()[1] =
            (self.bytes()[1] & !0b0000_0001) | (if to_ds { 0b0000_0001 } else { 0b0000_0000 });
    }

    fn from_ds(&mut self, from_ds: bool) {
        self.bytes_mut()[1] =
            (self.bytes()[1] & !0b0000_0010) | (if from_ds { 0b0000_0010 } else { 0b0000_0000 });
    }

    fn ds_status(&mut self, ds_status: DSStatus) {
        let (from_ds, to_ds) = ds_status.to_bools();
        self.from_ds(from_ds);
        self.to_ds(to_ds);
    }

    fn more_fragments(&mut self, more_fragments: bool) {
        self.bytes_mut()[1] = (self.bytes()[1] & !0b0000_0100)
            | (if more_fragments {
                0b0000_0100
            } else {
                0b0000_0000
            });
    }

    fn retry(&mut self, retry: bool) {
        self.bytes_mut()[1] =
            (self.bytes()[1] & !0b0000_1000) | (if retry { 0b0000_1000 } else { 0b0000_0000 });
    }

    fn pwr_mgt(&mut self, pwr_mgt: bool) {
        self.bytes_mut()[1] =
            (self.bytes()[1] & !0b0001_0000) | (if pwr_mgt { 0b0001_0000 } else { 0b0000_0000 });
    }

    fn more_data(&mut self, more_data: bool) {
        self.bytes_mut()[1] =
            (self.bytes()[1] & !0b0010_0000) | (if more_data { 0b0010_0000 } else { 0b0000_0000 });
    }

    fn protected(&mut self, protected: bool) {
        self.bytes_mut()[1] =
            (self.bytes()[1] & !0b0100_0000) | (if protected { 0b0100_0000 } else { 0b0000_0000 });
    }

    fn order(&mut self, order: bool) {
        self.bytes_mut()[1] =
            (self.bytes()[1] & !0b1000_0000) | (if order { 0b1000_0000 } else { 0b0000_0000 });
    }

    fn duration_or_id(&mut self, _duration_or_id: DurationID) {
        unimplemented!()
    }

    fn addr1(&mut self, mac_address: MacAddress) {
        self.bytes_mut()[4..10].copy_from_slice(mac_address.as_bytes());
    }

    /// Receiver Address
    /// Who this packet is destined for wirelessly.
    /// Address 1
    fn receiver_address(&mut self, mac_address: MacAddress) {
        self.addr1(mac_address)
    }

    /// Destination Address
    /// Who the packet is destined for.
    fn destination_address(&mut self, mac_address: MacAddress) {
        self.receiver_address(mac_address)
    }
}

#[test]
fn test_frame_builder() {
    let mut frame_builder = FrameBuilder::new();

    frame_builder.version(FrameVersion::Standard);
    frame_builder.type_(FrameType::Data);
    frame_builder.subtype(FrameSubtype::Data(DataSubtype::Null));
    frame_builder.ds_status(DSStatus::WDSOrMesh);

    frame_builder.more_fragments(true);
    frame_builder.retry(true);
    frame_builder.pwr_mgt(true);
    frame_builder.more_data(true);
    frame_builder.protected(true);
    frame_builder.order(true);

    frame_builder.receiver_address("11:22:33:44:55:66".parse().unwrap());

    let frame = frame_builder.build();

    assert_eq!(frame.version(), FrameVersion::Standard, "version");
    assert_eq!(frame.type_(), FrameType::Data, "type_");
    assert_eq!(
        frame.subtype(),
        FrameSubtype::Data(DataSubtype::Null),
        "subtype"
    );
    assert_eq!(frame.ds_status(), DSStatus::WDSOrMesh, "ds_status");

    assert_eq!(frame.more_fragments(), true, "more_fragments");
    assert_eq!(frame.retry(), true, "retry");
    assert_eq!(frame.pwr_mgt(), true, "pwr_mgt");
    assert_eq!(frame.more_data(), true, "more_data");
    assert_eq!(frame.protected(), true, "protected");
    assert_eq!(frame.order(), true, "order");

    assert_eq!(
        frame.receiver_address(),
        "11:22:33:44:55:66".parse().unwrap(),
        "receiver_address"
    );
}