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use proc_macro2::{Span, TokenStream};
use syn::spanned::Spanned;
use syn::{Expr, Field as SynField, Ident, Index, Result, Type};

use crate::attrs::{parse_attributes, AttributeSpanWrapper, FieldAttr, SqlIdentifier};

pub struct Field {
    pub ty: Type,
    pub span: Span,
    pub name: FieldName,
    column_name: Option<AttributeSpanWrapper<SqlIdentifier>>,
    pub sql_type: Option<AttributeSpanWrapper<Type>>,
    pub treat_none_as_default_value: Option<AttributeSpanWrapper<bool>>,
    pub treat_none_as_null: Option<AttributeSpanWrapper<bool>>,
    pub serialize_as: Option<AttributeSpanWrapper<Type>>,
    pub deserialize_as: Option<AttributeSpanWrapper<Type>>,
    pub select_expression: Option<AttributeSpanWrapper<Expr>>,
    pub select_expression_type: Option<AttributeSpanWrapper<Type>>,
    pub embed: Option<AttributeSpanWrapper<bool>>,
    pub skip_insertion: Option<AttributeSpanWrapper<bool>>,
}

impl Field {
    pub fn from_struct_field(field: &SynField, index: usize) -> Result<Self> {
        let SynField {
            ident, attrs, ty, ..
        } = field;

        let mut column_name = None;
        let mut sql_type = None;
        let mut serialize_as = None;
        let mut deserialize_as = None;
        let mut embed = None;
        let mut skip_insertion = None;
        let mut select_expression = None;
        let mut select_expression_type = None;
        let mut treat_none_as_default_value = None;
        let mut treat_none_as_null = None;

        for attr in parse_attributes(attrs)? {
            let attribute_span = attr.attribute_span;
            let ident_span = attr.ident_span;
            match attr.item {
                FieldAttr::ColumnName(_, value) => {
                    column_name = Some(AttributeSpanWrapper {
                        item: value,
                        attribute_span,
                        ident_span,
                    })
                }
                FieldAttr::SqlType(_, value) => {
                    sql_type = Some(AttributeSpanWrapper {
                        item: Type::Path(value),
                        attribute_span,
                        ident_span,
                    })
                }
                FieldAttr::TreatNoneAsDefaultValue(_, value) => {
                    treat_none_as_default_value = Some(AttributeSpanWrapper {
                        item: value.value,
                        attribute_span,
                        ident_span,
                    })
                }
                FieldAttr::TreatNoneAsNull(_, value) => {
                    treat_none_as_null = Some(AttributeSpanWrapper {
                        item: value.value,
                        attribute_span,
                        ident_span,
                    })
                }
                FieldAttr::SerializeAs(_, value) => {
                    serialize_as = Some(AttributeSpanWrapper {
                        item: Type::Path(value),
                        attribute_span,
                        ident_span,
                    })
                }
                FieldAttr::DeserializeAs(_, value) => {
                    deserialize_as = Some(AttributeSpanWrapper {
                        item: Type::Path(value),
                        attribute_span,
                        ident_span,
                    })
                }
                FieldAttr::SelectExpression(_, value) => {
                    select_expression = Some(AttributeSpanWrapper {
                        item: value,
                        attribute_span,
                        ident_span,
                    })
                }
                FieldAttr::SelectExpressionType(_, value) => {
                    select_expression_type = Some(AttributeSpanWrapper {
                        item: value,
                        attribute_span,
                        ident_span,
                    })
                }
                FieldAttr::Embed(_) => {
                    embed = Some(AttributeSpanWrapper {
                        item: true,
                        attribute_span,
                        ident_span,
                    })
                }
                FieldAttr::SkipInsertion(_) => {
                    skip_insertion = Some(AttributeSpanWrapper {
                        item: true,
                        attribute_span,
                        ident_span,
                    })
                }
            }
        }

        let name = match ident.clone() {
            Some(x) => FieldName::Named(x),
            None => FieldName::Unnamed(index.into()),
        };

        let span = match name {
            FieldName::Named(ref ident) => ident.span(),
            FieldName::Unnamed(_) => ty.span(),
        };

        Ok(Self {
            ty: ty.clone(),
            span,
            name,
            column_name,
            sql_type,
            treat_none_as_default_value,
            treat_none_as_null,
            serialize_as,
            deserialize_as,
            select_expression,
            select_expression_type,
            embed,
            skip_insertion,
        })
    }

    pub fn column_name(&self) -> Result<SqlIdentifier> {
        let identifier = self.column_name.as_ref().map(|a| a.item.clone());
        if let Some(identifier) = identifier {
            Ok(identifier)
        } else {
            match self.name {
                FieldName::Named(ref x) => Ok(x.into()),
                FieldName::Unnamed(ref x) => Err(syn::Error::new(
                    x.span(),
                    "All fields of tuple structs must be annotated with `#[diesel(column_name)]`",
                )),
            }
        }
    }

    pub fn ty_for_deserialize(&self) -> &Type {
        if let Some(AttributeSpanWrapper { item: value, .. }) = &self.deserialize_as {
            value
        } else {
            &self.ty
        }
    }

    pub(crate) fn embed(&self) -> bool {
        self.embed.as_ref().map(|a| a.item).unwrap_or(false)
    }

    pub(crate) fn skip_insertion(&self) -> bool {
        self.skip_insertion
            .as_ref()
            .map(|a| a.item)
            .unwrap_or(false)
    }
}

pub enum FieldName {
    Named(Ident),
    Unnamed(Index),
}

impl quote::ToTokens for FieldName {
    fn to_tokens(&self, tokens: &mut TokenStream) {
        match *self {
            FieldName::Named(ref x) => x.to_tokens(tokens),
            FieldName::Unnamed(ref x) => x.to_tokens(tokens),
        }
    }
}