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use serde::ser::Serializer;
use serde::Serialize;
use std::fmt;

use crate::checker::Checker;
use crate::*;

/// The `NArgs` metric.
///
/// This metric counts the number of arguments
/// of a function/method.
#[derive(Debug, Clone)]
pub struct Stats {
    n_args: usize,
}

impl Default for Stats {
    fn default() -> Self {
        Self { n_args: 0 }
    }
}

impl Serialize for Stats {
    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
    where
        S: Serializer,
    {
        serializer.serialize_f64(self.n_args())
    }
}

impl fmt::Display for Stats {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "{}", self.n_args)
    }
}

impl Stats {
    #[doc(hidden)]
    pub fn merge(&mut self, _other: &Stats) {}

    /// Returns the `NArgs` metric value
    pub fn n_args(&self) -> f64 {
        self.n_args as f64
    }
}

#[doc(hidden)]
pub trait NArgs
where
    Self: Checker,
{
    fn compute(node: &Node, stats: &mut Stats) {
        if !Self::is_func(node) {
            return;
        }

        if let Some(params) = node.object().child_by_field_name("parameters") {
            let node_params = Node::new(params);
            node_params.act_on_child(&mut |n| {
                if !Self::is_non_arg(n) {
                    stats.n_args += 1;
                }
            });
        }
    }
}

impl NArgs for CppCode {
    fn compute(node: &Node, stats: &mut Stats) {
        if !Self::is_func(node) {
            return;
        }

        if let Some(declarator) = node.object().child_by_field_name("declarator") {
            if let Some(params) = declarator.child_by_field_name("parameters") {
                let node_params = Node::new(params);
                node_params.act_on_child(&mut |n| {
                    if !Self::is_non_arg(n) {
                        stats.n_args += 1;
                    }
                });
            }
        }
    }
}

impl NArgs for PythonCode {}
impl NArgs for MozjsCode {}
impl NArgs for JavascriptCode {}
impl NArgs for TypescriptCode {}
impl NArgs for TsxCode {}
impl NArgs for RustCode {}
impl NArgs for PreprocCode {}
impl NArgs for CcommentCode {}
impl NArgs for CSharpCode {}
impl NArgs for JavaCode {}
impl NArgs for GoCode {}
impl NArgs for CssCode {}
impl NArgs for HtmlCode {}