pub struct StructSpec {
    build: String,
    children: Vec<Box<StructChild>>,
}

impl StructSpec {
    pub fn new(build: &str, children: Vec<Box<StructChild>>) -> Self {
        Self {
            build: build.to_string(),
            children,
        }
    }

    /// The type to be built, in Pascal case.
    pub fn build(&self) -> &str {
        &self.build
    }

    /// The children for this build spec.
    pub fn children(&self) -> impl Iterator<Item = &StructChild> {
        self.children.iter().map(Box::as_ref)
    }
}

pub enum StructChild {
    SkipChild(SkipChild),
    VecChild(VecChild),
    MemberChild(MemberChild),
}

pub struct SkipChild {
    rule: String,
}

impl SkipChild {
    pub fn new(rule: &str) -> Self {
        Self {
            rule: rule.to_string(),
        }
    }

    /// The grammar rule to match.
    pub fn rule(&self) -> &str {
        &self.rule
    }
}

pub struct VecChild {
    name: String,
    rule: String,
    build: Box<VecChildBuild>,
}

impl VecChild {
    pub fn new(name: &str, rule: &str, build: Box<VecChildBuild>) -> Self {
        Self {
            name: name.to_string(),
            rule: rule.to_string(),
            build,
        }
    }

    /// The name of this child.
    pub fn name(&self) -> &str {
        &self.name
    }

    /// The rule to match to build this child.
    pub fn rule(&self) -> &str {
        &self.rule
    }

    pub fn build(&self) -> &VecChildBuild {
        &self.build
    }
}

pub enum VecChildBuild {
    String(VecChildStringBuild),
    Node(VecChildNodeBuild),
}

pub struct VecChildStringBuild {
    with: String,
}

impl VecChildStringBuild {
    pub fn new(with: &str) -> Self {
        Self {
            with: with.to_string(),
        }
    }

    pub fn with(&self) -> &str {
        &self.with
    }
}

pub struct VecChildNodeBuild {
    kind: String,
    with: String,
}

impl VecChildNodeBuild {
    pub fn new(kind: &str, with: &str) -> Self {
        Self {
            kind: kind.to_string(),
            with: with.to_string(),
        }
    }

    pub fn kind(&self) -> &str {
        &self.kind
    }

    pub fn with(&self) -> &str {
        &self.with
    }
}

#[derive(Debug)]
pub struct MemberChild {
    name: String,
    rule: String,
    optional: bool,
    build: Box<MemberChildBuild>,
}

impl MemberChild {
    pub fn new(name: &str, rule: &str, optional: bool, build: Box<MemberChildBuild>) -> Self {
        Self {
            name: name.to_string(),
            rule: rule.to_string(),
            optional,
            build,
        }
    }

    /// The name of this child in the yaml file, in snake case.
    pub fn name(&self) -> &str {
        &self.name
    }

    /// The grammar rule to match to build this child.
    pub fn rule(&self) -> &str {
        &self.rule
    }

    pub fn optional(&self) -> bool {
        self.optional
    }

    /// The specification for what to actually build.
    pub fn build(&self) -> &MemberChildBuild {
        &self.build
    }
}

#[derive(Debug)]
pub enum MemberChildBuild {
    Node(NodeMemberBuild),
    Boolean(BooleanMemberBuild),
    Special(SpecialMemberBuild),
}

#[derive(Debug)]
pub struct NodeMemberBuild {
    kind: String,
    with: String,
    or_else: Option<String>,
}

impl NodeMemberBuild {
    pub fn new(kind: &str, with: &str, or_else: Option<String>) -> Self {
        Self {
            kind: kind.to_string(),
            with: with.to_string(),
            or_else,
        }
    }

    /// The type to build, in Pascal case.
    pub fn kind(&self) -> &str {
        &self.kind
    }

    pub fn with(&self) -> &str {
        &self.with
    }

    /// The default fn to call when unwrapping the child (before passing as arg to new).
    pub fn or_else(&self) -> Option<&str> {
        self.or_else.as_deref()
    }
}

#[derive(Debug)]
pub struct BooleanMemberBuild {
    on: BooleanMemberBuildOn,
}

impl BooleanMemberBuild {
    pub fn new(on: BooleanMemberBuildOn) -> Self {
        Self { on }
    }

    pub fn on(&self) -> &BooleanMemberBuildOn {
        &self.on
    }
}

#[derive(Debug)]
pub enum BooleanMemberBuildOn {
    RulePresent,
}

#[derive(Debug)]
pub enum SpecialMemberBuild {
    FileId,
    Range,
}