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use std::collections::HashSet;

use anyhow::{anyhow, Context as _};
use const_format::formatcp;

use super::{
    Context,
    Parser,
    EXTERN_EXCEPTION_TRAIT_MODULE_NAME,
    RUST_MODULE_NAME,
    TRAITS_MODULE_NAME,
};
use crate::model::r#enum::Enum;
use crate::model::Module;

impl Parser<syn::ItemMod> for Module {
    fn parse(data: &syn::ItemMod, context: &mut Context) -> anyhow::Result<Self> {
        let syn_enums = get_enums_from_module(data, context)?;

        let enums: HashSet<Enum> = syn_enums
            .iter()
            .map(|item| Parser::parse(*item, context))
            .collect::<Result<_, _>>()?;

        if enums.len() != syn_enums.len() {
            return Err(anyhow!("Duplicated enums found"));
        }

        let syn_exception_trait =
            get_extern_mod_from_module(data, context, EXTERN_EXCEPTION_TRAIT_MODULE_NAME).context(
                formatcp!("Cant find extern mod `{EXTERN_EXCEPTION_TRAIT_MODULE_NAME}`"),
            )?;
        let exception_trait = Parser::parse(&syn_exception_trait.items, context)
            .context(formatcp!("Error in `{EXTERN_EXCEPTION_TRAIT_MODULE_NAME}`"))?;

        let syn_traits_module = get_extern_mod_from_module(data, context, TRAITS_MODULE_NAME)
            .context(formatcp!("Cant find extern mod `{TRAITS_MODULE_NAME}`"))?;
        let traits_module = Parser::parse(&syn_traits_module.items, context)
            .context(formatcp!("Error in `{TRAITS_MODULE_NAME}`"))?;

        let syn_rust_module = get_extern_mod_from_module(data, context, RUST_MODULE_NAME)
            .context(formatcp!("Cant find extern mod `{RUST_MODULE_NAME}`"))?;
        let rust_module = Parser::parse(&syn_rust_module.items, context)
            .context(formatcp!("Error in `{RUST_MODULE_NAME}`"))?;

        let unknown = context.name_tracker.get_unknown();
        if !unknown.is_empty() {
            return Err(anyhow!("Some types are unknown: {unknown:?}"));
        }

        Ok(Self {
            enums,
            exception_trait,
            traits_module,
            rust_module,
        })
    }
}

fn get_enums_from_module<'a>(
    module: &'a syn::ItemMod,
    context: &Context,
) -> anyhow::Result<Vec<&'a syn::ItemEnum>> {
    Ok(module
        .content
        .as_ref()
        .context("The module is empty")?
        .1
        .iter()
        .filter_map(|item| match item {
            syn::Item::Enum(enum_item) => Some(enum_item),
            _ => None,
        })
        .filter(|item| context.build_context.check_cfg_attrs(&item.attrs))
        .collect())
}

fn get_extern_mod_from_module<'a>(
    module: &'a syn::ItemMod,
    context: &Context,
    extern_lang: &str,
) -> Option<&'a syn::ItemForeignMod> {
    module.content.as_ref().and_then(|(_, items)| {
        items.iter().find_map(|module_item| match module_item {
            syn::Item::ForeignMod(
                rust_module @ syn::ItemForeignMod {
                    abi:
                        syn::Abi {
                            name: Some(lang), ..
                        },
                    ..
                },
            ) if lang.value() == extern_lang
                && context.build_context.check_cfg_attrs(&rust_module.attrs) =>
            {
                Some(rust_module)
            }
            _ => None,
        })
    })
}