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use crate::{
    config::Config,
    library::{self, Function, Parameter, Type, MAIN_NAMESPACE},
    version::Version,
    Library,
};

pub fn apply_config(library: &mut Library, cfg: &Config) {
    fix_versions_by_config(library, cfg);
}

pub fn check_function_real_version(library: &mut Library) {
    // In order to avoid the borrow checker to annoy us...
    let library2 = library as *const Library;
    for typ in &mut library.namespace_mut(MAIN_NAMESPACE).types {
        match typ {
            Some(Type::Class(c)) => update_function_version(&mut c.functions, library2),
            Some(Type::Interface(i)) => update_function_version(&mut i.functions, library2),
            Some(Type::Union(u)) => update_function_version(&mut u.functions, library2),
            Some(Type::Record(r)) => update_function_version(&mut r.functions, library2),
            Some(Type::Bitfield(b)) => update_function_version(&mut b.functions, library2),
            Some(Type::Enumeration(e)) => update_function_version(&mut e.functions, library2),
            _ => {}
        }
    }
    update_function_version(
        &mut library.namespace_mut(MAIN_NAMESPACE).functions,
        library2,
    );
}

fn check_versions(param: &Parameter, current_version: &mut Option<Version>, lib: *const Library) {
    if param.typ.ns_id != MAIN_NAMESPACE {
        return;
    }
    let ty_version = match unsafe { (*lib).type_(param.typ) } {
        library::Type::Class(c) => c.version,
        library::Type::Enumeration(c) => c.version,
        library::Type::Bitfield(c) => c.version,
        library::Type::Record(c) => c.version,
        library::Type::Interface(c) => c.version,
        _ => None,
    };
    let new_version = match (*current_version, ty_version) {
        (Some(current_version), Some(ty_version)) => {
            if current_version < ty_version {
                Some(ty_version)
            } else {
                None
            }
        }
        (None, Some(ty_version)) => Some(ty_version),
        _ => None,
    };
    if let Some(new_version) = new_version {
        *current_version = Some(new_version);
    }
}

fn update_function_version(functions: &mut Vec<Function>, lib: *const Library) {
    for function in functions {
        let mut current_version = None;
        for parameter in &function.parameters {
            check_versions(parameter, &mut current_version, lib);
        }
        check_versions(&function.ret, &mut current_version, lib);
        if match (current_version, function.version) {
            (Some(cur_ver), Some(lib_ver)) => cur_ver > lib_ver,
            (Some(_), None) => true,
            _ => false,
        } {
            function.version = current_version;
        }
    }
}

fn fix_versions_by_config(library: &mut Library, cfg: &Config) {
    use crate::library::Type::*;
    for obj in cfg.objects.values() {
        if obj.status.ignored() {
            continue;
        }
        if obj.version.is_none() {
            continue;
        }
        let version = obj.version;

        let Some(tid) = library.find_type(0, &obj.name) else {
            continue;
        };
        match library.type_mut(tid) {
            Class(class) => class.version = version,
            Interface(interface) => interface.version = version,
            Record(record) => record.version = version,
            Bitfield(flags) => flags.version = version,
            Enumeration(enum_) => enum_.version = version,
            _ => (),
        }
    }
}