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use serde::de::{self, Deserializer, Visitor};
use serde::{ser, Deserialize, Serialize};
use std::fmt;

#[derive(Debug, Deserialize)]
pub struct Rename {
    pub path: String,
    pub rename: String,
}

#[derive(Debug, Deserialize)]
#[serde(untagged)]
pub enum DisallowedPath {
    Simple(String),
    WithReason { path: String, reason: Option<String> },
}

impl DisallowedPath {
    pub fn path(&self) -> &str {
        let (Self::Simple(path) | Self::WithReason { path, .. }) = self;

        path
    }

    pub fn reason(&self) -> Option<&str> {
        match &self {
            Self::WithReason { reason, .. } => reason.as_deref(),
            Self::Simple(_) => None,
        }
    }
}

#[derive(Clone, Copy, Debug, PartialEq, Eq, Deserialize, Serialize)]
pub enum MatchLintBehaviour {
    AllTypes,
    WellKnownTypes,
    Never,
}

#[derive(Debug)]
pub struct MacroMatcher {
    pub name: String,
    pub braces: (char, char),
}

impl<'de> Deserialize<'de> for MacroMatcher {
    fn deserialize<D>(deser: D) -> Result<Self, D::Error>
    where
        D: Deserializer<'de>,
    {
        #[derive(Deserialize)]
        #[serde(field_identifier, rename_all = "lowercase")]
        enum Field {
            Name,
            Brace,
        }
        struct MacVisitor;
        impl<'de> Visitor<'de> for MacVisitor {
            type Value = MacroMatcher;

            fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
                formatter.write_str("struct MacroMatcher")
            }

            fn visit_map<V>(self, mut map: V) -> Result<Self::Value, V::Error>
            where
                V: de::MapAccess<'de>,
            {
                let mut name = None;
                let mut brace: Option<char> = None;
                while let Some(key) = map.next_key()? {
                    match key {
                        Field::Name => {
                            if name.is_some() {
                                return Err(de::Error::duplicate_field("name"));
                            }
                            name = Some(map.next_value()?);
                        },
                        Field::Brace => {
                            if brace.is_some() {
                                return Err(de::Error::duplicate_field("brace"));
                            }
                            brace = Some(map.next_value()?);
                        },
                    }
                }
                let name = name.ok_or_else(|| de::Error::missing_field("name"))?;
                let brace = brace.ok_or_else(|| de::Error::missing_field("brace"))?;
                Ok(MacroMatcher {
                    name,
                    braces: [('(', ')'), ('{', '}'), ('[', ']')]
                        .into_iter()
                        .find(|b| b.0 == brace)
                        .map(|(o, c)| (o.to_owned(), c.to_owned()))
                        .ok_or_else(|| de::Error::custom(format!("expected one of `(`, `{{`, `[` found `{brace}`")))?,
                })
            }
        }

        const FIELDS: &[&str] = &["name", "brace"];
        deser.deserialize_struct("MacroMatcher", FIELDS, MacVisitor)
    }
}

// these impls are never actually called but are used by the various config options that default to
// empty lists
macro_rules! unimplemented_serialize {
    ($($t:ty,)*) => {
        $(
            impl Serialize for $t {
                fn serialize<S>(&self, _serializer: S) -> Result<S::Ok, S::Error>
                where
                    S: ser::Serializer,
                {
                    Err(ser::Error::custom("unimplemented"))
                }
            }
        )*
    }
}

unimplemented_serialize! {
    DisallowedPath,
    Rename,
    MacroMatcher,
}

#[derive(Clone, Copy, Debug, PartialEq, Eq, Deserialize, Serialize)]
pub enum PubUnderscoreFieldsBehaviour {
    PubliclyExported,
    AllPubFields,
}