use crate::{context::CommandContext, modifier::RedirectModifier, tree::CommandNode};

use super::{literal_argument_builder::Literal, required_argument_builder::Argument};
use std::{cell::RefCell, fmt::Debug, rc::Rc};

#[derive(Debug, Clone)]
pub enum ArgumentBuilderType {
    Literal(Literal),
    Argument(Argument),
}

/// A node that hasn't yet been built.
pub struct ArgumentBuilder<S> {
    arguments: CommandNode<S>,

    command: Option<Rc<dyn Fn(&CommandContext<S>) -> i32>>,
    requirement: Rc<dyn Fn(Rc<S>) -> bool>,
    target: Option<Rc<RefCell<CommandNode<S>>>>,

    forks: bool,
    modifier: Option<Rc<RedirectModifier<S>>>,
}

impl<S> Clone for ArgumentBuilder<S> {
    fn clone(&self) -> Self {
        Self {
            arguments: self.arguments.clone(),
            command: self.command.clone(),
            requirement: self.requirement.clone(),
            target: self.target.clone(),
            forks: self.forks,
            modifier: self.modifier.clone(),
        }
    }
}

/// A node that isn't yet built.
impl<S> ArgumentBuilder<S> {
    pub fn new(value: ArgumentBuilderType) -> Self {
        Self {
            arguments: CommandNode {
                value,
                ..Default::default()
            },
            command: None,
            requirement: Rc::new(|_| true),
            forks: false,
            modifier: None,
            target: None,
        }
    }

    pub fn then(&mut self, argument: ArgumentBuilder<S>) -> Self {
        self.then_built(argument.build())
    }

    pub fn then_built(&mut self, argument: CommandNode<S>) -> Self {
        self.arguments.add_child(&Rc::new(RefCell::new(argument)));
        self.clone()
    }

    pub fn executes<F>(&mut self, f: F) -> Self
    where
        F: Fn(&CommandContext<S>) -> i32 + 'static,
    {
        self.command = Some(Rc::new(f));
        self.clone()
    }

    pub fn requires<F>(&mut self, requirement: F) -> Self
    where
        F: Fn(Rc<S>) -> bool + 'static,
    {
        self.requirement = Rc::new(requirement);
        self.clone()
    }

    pub fn redirect(&mut self, target: Rc<RefCell<CommandNode<S>>>) -> Self {
        self.forward(target, None, false)
    }

    pub fn fork(
        &mut self,
        target: Rc<RefCell<CommandNode<S>>>,
        modifier: Rc<RedirectModifier<S>>,
    ) -> Self {
        self.forward(target, Some(modifier), true)
    }

    pub fn forward(
        &mut self,
        target: Rc<RefCell<CommandNode<S>>>,
        modifier: Option<Rc<RedirectModifier<S>>>,
        fork: bool,
    ) -> Self {
        if !self.arguments.children.is_empty() {
            panic!("Cannot forward a node with children");
        }
        self.target = Some(target);
        self.modifier = modifier;
        self.forks = fork;
        self.clone()
    }

    pub fn build(self) -> CommandNode<S> {
        let mut result = CommandNode {
            value: self.arguments.value,
            command: self.command,
            requirement: self.requirement,
            redirect: self.target,
            modifier: self.modifier,
            forks: self.forks,
            arguments: Default::default(),
            children: Default::default(),
            literals: Default::default(),
        };

        for argument in self.arguments.children.values() {
            result.add_child(argument);
        }

        result
    }
}

impl<S> Debug for ArgumentBuilder<S> {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        f.debug_struct("ArgumentBuilder")
            .field("arguments", &self.arguments)
            // .field("command", &self.command)
            // .field("requirement", &self.requirement)
            .field("target", &self.target)
            .field("forks", &self.forks)
            // .field("modifier", &self.modifier)
            .finish()
    }
}