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use std::collections::{HashMap, HashSet};

#[derive(Debug, Clone)]
pub struct ResolverOptions {
    /// Tried detect file with this extension.
    /// Default is ["js", "json", "node"]
    pub extensions: Vec<String>,
    /// Maps key to value.
    /// `None` means that the value is `false`.
    /// Default is `HashMap::new()`.
    pub alias: HashMap<String, Option<String>>,
    /// The list of alias fields in description files.
    /// TODO: currently only support one alias field.
    /// Default is `[]`
    pub alias_fields: Vec<String>,
    /// Condition names for exports filed. Note that its
    /// type is a `HashSet`, because the priority is
    /// related to the order in which the export field
    /// fields are written.
    /// Default is `Set(["node"])`.
    pub condition_names: HashSet<String>,
    /// Whether to resolve the real path when the result
    /// is a symlink.
    /// Default is `true`.
    pub symlinks: bool,
    /// A JSON file to describing this lib information.
    /// Default is `Some("package.json")`. It can be set
    /// to `None` when resolve css.
    pub description_file: Option<String>,
    /// Main file in this directory.
    /// Default is `["index"]`.
    pub main_files: Vec<String>,
    /// Main fields in Description.
    /// Default is `["main"]`.
    pub main_fields: Vec<String>,
    /// Directories to resolve module from.
    /// Default is `["node_modules"]`.
    pub modules: Vec<String>,
    /// Prefer to resolve request as relative request and
    /// fallback to resolveing as modules.
    /// Default is `false`
    pub prefer_relative: bool,
    /// Cache had stored the processed `description_file` parsing information by default,
    /// but the action is not secure, and when you try to modify a `description_file`,
    /// they will still use the data before the modification.
    /// Default is `true`.
    pub enable_unsafe_cache: bool,
}

impl Default for ResolverOptions {
    fn default() -> Self {
        let extensions = vec![
            String::from("js"),
            String::from("json"),
            String::from("node"),
        ];
        let main_files = vec![String::from("index")];
        let main_fields = vec![String::from("main")];
        let description_file = Some(String::from("package.json"));
        let alias = HashMap::new();
        let modules = vec![String::from("node_modules")];
        let symlinks = true;
        let alias_fields = vec![];
        let condition_names: HashSet<String> =
            HashSet::from_iter(["node"].into_iter().map(String::from));
        let prefer_relative = false;
        let enable_unsafe_cache = true;
        Self {
            enable_unsafe_cache,
            prefer_relative,
            extensions,
            main_files,
            main_fields,
            description_file,
            alias,
            modules,
            symlinks,
            alias_fields,
            condition_names,
        }
    }
}