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use expresso::expression::Expression;
use expresso::variables::Variable;

use crate::context::Context;

#[derive(Debug)]
#[allow(dead_code)]
pub struct BakedExpression {
	original:   String,
	expression: Option<Expression>,
	baked:      Baked,
}

#[derive(Debug)]
pub enum Baked {
	EMPTY,
	F32(f32),
	U32(u32),
	STRING(String),
}

impl BakedExpression {
	pub fn new() -> Self {
		Self {
			original:   String::new(),
			expression: None,
			baked:      Baked::EMPTY,
		}
	}

	pub fn from_str(v: &str) -> Self {
		let mut expression = Expression::new();
		expression.enable_upgrade_of_literals_to_strings();
		match expression.from_str(v) {
			// :TODO: handle error
			_ => {},
		}

		Self {
			original:   v.to_string(),
			expression: Some(expression),
			baked:      Baked::EMPTY,
		}
	}

	pub fn from_f32(v: f32) -> Self {
		Self {
			original:   String::new(),
			expression: None,
			baked:      Baked::F32(v),
		}
	}

	pub fn from_u32(v: u32) -> Self {
		Self {
			original:   String::new(),
			expression: None,
			baked:      Baked::U32(v),
		}
	}

	pub fn bake_f32_or(&mut self, context: &mut Context, default: f32) {
		if let Some(e) = &self.expression {
			let r = e.run(context.get_mut_machine());
			match r.top() {
				Some(Variable::F32(f)) => {
					self.baked = Baked::F32(*f);
				},
				Some(Variable::ERROR(e)) => {
					println!("Error baking {:?} in {:?} -> {:?}", self, context, e);
					self.baked = Baked::F32(default);
				},
				t => todo!("Result type not handled {:?} {:?} {:?}", t, r, e),
			}
		} else {
			match self.baked {
				Baked::F32(_) => {}, // just keep the baked value
				_ => self.baked = Baked::F32(default),
			}
		}
	}

	pub fn bake_u32_or(&mut self, context: &mut Context, default: u32) {
		if let Some(e) = &self.expression {
			let r = e.run(context.get_mut_machine());
			match r.top() {
				Some(Variable::F32(f)) => {
					self.baked = Baked::U32(*f as u32);
				},
				Some(Variable::I32(i)) => {
					// :HACK: :TODO: at least add a range check
					self.baked = Baked::U32(*i as u32);
				},
				Some(Variable::ERROR(e)) => {
					// :TODO: make error visible to caller/user
					println!(
						"Error baking {:?} got stack {:?} using default {} -> {:?}",
						&self, &r, &default, e
					);
					self.baked = Baked::U32(default);
				},
				t => {
					dbg!(&self);
					todo!("Result type not handled {:?} {:?} {:?}", t, r, e)
				},
			}
		} else {
			match self.baked {
				Baked::U32(_) => {}, // just keep the baked value
				_ => self.baked = Baked::U32(default),
			}
		}
	}

	pub fn bake_string_or(&mut self, context: &mut Context, default: &str) {
		if let Some(e) = &self.expression {
			let r = e.run(context.get_mut_machine());
			match r.top() {
				Some(Variable::F32(f)) => {
					self.baked = Baked::STRING(format!("{}", f).to_string());
				},
				Some(Variable::String(s)) => {
					self.baked = Baked::STRING(s.to_string());
				},
				Some(Variable::ERROR(e)) => {
					println!("Error baking {:?} in {:?} -> {:?}", self, context, e);
					self.baked = Baked::STRING(default.to_string());
				},
				None => {
					self.baked = Baked::STRING(default.to_string());
				},
				t => todo!("Result type not handled {:?} {:?} {:?}", t, r, e),
			}
		} else {
			match self.baked {
				Baked::F32(_) => {}, // just keep the baked value
				_ => self.baked = Baked::STRING(default.to_string()),
			}
		}
	}

	pub fn as_f32(&self) -> f32 {
		match self.baked {
			Baked::F32(f) => f,
			Baked::U32(u) => u as f32,
			_ => 0.0, // :TODO: report error in "trace" mode
		}
	}

	pub fn as_u32(&self) -> u32 {
		match self.baked {
			Baked::U32(u) => u,
			Baked::F32(f) => f as u32,
			_ => 0, // :TODO: report error in "trace" mode
		}
	}

	pub fn as_string(&self) -> String {
		match &self.baked {
			Baked::STRING(s) => s.clone(),
			Baked::U32(u) => format!("{}", u).to_string(),
			Baked::F32(f) => format!("{}", f).to_string(),
			_ => String::new(), // :TODO: report error in "trace" mode
		}
	}
}