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use crate::rstd::tracing::{rendered::*, *};

use super::*;

enum TraceCommon<'a> {
    Pure,
    InvolvesOneResolution,
    Event(&'a str),
    Wrapped { name: &'a str, trace: &'a Trace },
}

enum TraceAny<'a> {
    Common(TraceCommon<'a>),
    Parallel(&'a Trace, &'a Trace),
    Sequential { first: &'a Trace, second: &'a Trace },
}

impl Trace {
    fn any(&self) -> TraceAny<'_> {
        match self {
            Self::Pure => TraceAny::Common(TraceCommon::Pure),
            Self::InvolvesOneResolution => TraceAny::Common(TraceCommon::InvolvesOneResolution),
            Self::Event(event) => TraceAny::Common(TraceCommon::Event(event)),
            Self::Wrapped { name, trace } => TraceAny::Common(TraceCommon::Wrapped {
                name,
                trace: &trace.trace,
            }),
            Self::Parallel(a, b) => TraceAny::Parallel(&a.trace, &b.trace),
            Self::Sequential { first, second } => TraceAny::Sequential {
                first: &first.trace,
                second: &second.trace,
            },
        }
    }

    fn render(&self) -> WithLengthAndWidth<RenderedAny> {
        self.any().render()
    }
}

impl<A> Traced<A> {
    pub fn render(&self) -> WithLengthAndWidth<RenderedAny> {
        self.effect.trace.render()
    }
}

fn from_sequential(
    first: &Trace,
    second: &Trace,
) -> WithLengthAndWidth<Vec<WithLengthAndWidth<RenderedWide>>> {
    let mut vec = WithLengthAndWidth::default();
    first.any().render_into_long(&mut vec);
    second.any().render_into_long(&mut vec);
    vec
}

fn from_parallel(
    a: &Trace,
    b: &Trace,
) -> WithLengthAndWidth<Vec<WithLengthAndWidth<RenderedLong>>> {
    let mut vec = WithLengthAndWidth::default();
    a.any().render_into_wide(&mut vec);
    b.any().render_into_wide(&mut vec);
    vec
}

impl<'a> TraceAny<'a> {
    fn render(&'a self) -> WithLengthAndWidth<RenderedAny> {
        match self {
            Self::Common(common) => common.render().map(RenderedAny::Common),
            Self::Parallel(a, b) => from_parallel(a, b).map(RenderedAny::Wide),
            Self::Sequential { first, second } => {
                from_sequential(first, second).map(RenderedAny::Long)
            }
        }
    }

    fn render_into_long(
        &'a self,
        vec: &mut WithLengthAndWidth<Vec<WithLengthAndWidth<RenderedWide>>>,
    ) {
        match self {
            Self::Common(common) => common.render().map(RenderedWide::Common).push_into(vec),
            Self::Parallel(a, b) => from_parallel(a, b).map(RenderedWide::Wide).push_into(vec),
            Self::Sequential { first, second } => {
                first.any().render_into_long(vec);
                second.any().render_into_long(vec);
            }
        }
    }

    fn render_into_wide(
        &'a self,
        vec: &mut WithLengthAndWidth<Vec<WithLengthAndWidth<RenderedLong>>>,
    ) {
        match self {
            Self::Common(common) => common.render().map(RenderedLong::Common).push_into(vec),
            Self::Parallel(a, b) => {
                a.any().render_into_wide(vec);
                b.any().render_into_wide(vec);
            }
            Self::Sequential { first, second } => from_sequential(first, second)
                .map(RenderedLong::Long)
                .push_into(vec),
        }
    }
}

impl<'a> TraceCommon<'a> {
    fn render(&'a self) -> WithLengthAndWidth<RenderedCommon> {
        match self {
            Self::Pure => RenderedCommon::empty(),
            Self::InvolvesOneResolution => RenderedCommon::resolution(),
            Self::Event(event) => RenderedCommon::event(event),
            Self::Wrapped { name, trace } => trace.any().render().wrap(name),
        }
    }
}