use crate::Value;

use serde::{Deserialize, Serialize};

#[derive(Debug, Clone, Default, Serialize, Deserialize)]
pub struct Record {
    pub cols: Vec<String>,
    pub vals: Vec<Value>,
}

impl Record {
    pub fn new() -> Self {
        Self::default()
    }

    pub fn with_capacity(capacity: usize) -> Self {
        Self {
            cols: Vec::with_capacity(capacity),
            vals: Vec::with_capacity(capacity),
        }
    }

    pub fn iter(&self) -> Iter {
        self.into_iter()
    }

    pub fn iter_mut(&mut self) -> IterMut {
        self.into_iter()
    }

    pub fn is_empty(&self) -> bool {
        self.cols.is_empty() || self.vals.is_empty()
    }

    pub fn len(&self) -> usize {
        usize::min(self.cols.len(), self.vals.len())
    }

    pub fn push(&mut self, col: impl Into<String>, val: Value) {
        self.cols.push(col.into());
        self.vals.push(val);
    }
}

impl FromIterator<(String, Value)> for Record {
    fn from_iter<T: IntoIterator<Item = (String, Value)>>(iter: T) -> Self {
        let (cols, vals) = iter.into_iter().unzip();
        Self { cols, vals }
    }
}

pub type IntoIter = std::iter::Zip<std::vec::IntoIter<String>, std::vec::IntoIter<Value>>;

impl IntoIterator for Record {
    type Item = (String, Value);

    type IntoIter = IntoIter;

    fn into_iter(self) -> Self::IntoIter {
        self.cols.into_iter().zip(self.vals)
    }
}

pub type Iter<'a> = std::iter::Zip<std::slice::Iter<'a, String>, std::slice::Iter<'a, Value>>;

impl<'a> IntoIterator for &'a Record {
    type Item = (&'a String, &'a Value);

    type IntoIter = Iter<'a>;

    fn into_iter(self) -> Self::IntoIter {
        self.cols.iter().zip(&self.vals)
    }
}

pub type IterMut<'a> = std::iter::Zip<std::slice::Iter<'a, String>, std::slice::IterMut<'a, Value>>;

impl<'a> IntoIterator for &'a mut Record {
    type Item = (&'a String, &'a mut Value);

    type IntoIter = IterMut<'a>;

    fn into_iter(self) -> Self::IntoIter {
        self.cols.iter().zip(&mut self.vals)
    }
}

#[macro_export]
macro_rules! record {
    {$($col:expr => $val:expr),+ $(,)?} => {
        $crate::Record {
            cols: vec![$($col.into(),)+],
            vals: vec![$($val,)+]
        }
    };
    {} => {
        $crate::Record::new()
    };
}