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use itertools::Itertools;
use vortex_error::VortexResult;
use vortex_scalar::Scalar;

use crate::array::struct_::StructArray;
use crate::compute::unary::{scalar_at, ScalarAtFn};
use crate::compute::{slice, take, ArrayCompute, SliceFn, TakeFn};
use crate::variants::StructArrayTrait;
use crate::{Array, ArrayDType, IntoArray};

impl ArrayCompute for StructArray {
    fn scalar_at(&self) -> Option<&dyn ScalarAtFn> {
        Some(self)
    }

    fn slice(&self) -> Option<&dyn SliceFn> {
        Some(self)
    }

    fn take(&self) -> Option<&dyn TakeFn> {
        Some(self)
    }
}

impl ScalarAtFn for StructArray {
    fn scalar_at(&self, index: usize) -> VortexResult<Scalar> {
        Ok(Scalar::r#struct(
            self.dtype().clone(),
            self.children()
                .map(|field| scalar_at(&field, index).map(|s| s.into_value()))
                .try_collect()?,
        ))
    }
}

impl TakeFn for StructArray {
    fn take(&self, indices: &Array) -> VortexResult<Array> {
        Self::try_new(
            self.names().clone(),
            self.children()
                .map(|field| take(&field, indices))
                .try_collect()?,
            indices.len(),
            self.validity().take(indices)?,
        )
        .map(|a| a.into_array())
    }
}

impl SliceFn for StructArray {
    fn slice(&self, start: usize, stop: usize) -> VortexResult<Array> {
        let fields = self
            .children()
            .map(|field| slice(&field, start, stop))
            .try_collect()?;
        Self::try_new(
            self.names().clone(),
            fields,
            stop - start,
            self.validity().slice(start, stop)?,
        )
        .map(|a| a.into_array())
    }
}