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use crate::Assembler;
use crate::tree::AsmNode::*;
use crate::tree::*;
use std::collections::HashMap;

/* -------------------------------- Constants ------------------------------- */

/// Traverse the tree to register the `@define` and `@define-math` directive.
/// Update the assembler's map.
fn register_define(asm: &mut Assembler) {
    let mut math_variables = HashMap::<String, String>::new();

    let mut registering_define = |node: &AsmNode| -> Option<AsmNode> {
        match node {
            Source{code, meta} => {
                if code[0].as_str() == "@define" || code[0].as_str() == "@define-math" {
                    let name = &code[1];
                    if code.len() < 3 {
                        return Some(Error{msg: format!("Error, directive {} should take as argument a define name and at least a replacement value.\n", &code[0]), meta: meta.clone()});
                    }
                    if asm.defines.contains_key(name) {
                        return Some(Error{msg: format!("Error, define {} has already been defined.\n", name), meta: meta.clone()});
                    }
                    if math_parse::contains_math_char(name) {
                        return Some(Error{msg: format!("Error, name of define {} contains not allowed char.\n", name), meta: meta.clone()});
                    }

                    if code[0].as_str() == "@define" {
                        let value = code[2..].to_vec();
                        let _ = asm.defines.insert(name.to_string(), value);
                        Some(Empty)
                    } else { // @define-math
                        let mut math_line = String::new();
                        for word in &code[2..] {
                            math_line.push_str(word);
                        }
                        match math_parse::math_parse_int(&math_line, Some(&math_variables)) {
                            Ok(i) => {
                                let _ = asm.defines.insert(name.to_string(), vec![format!("{i}")]);
                                let _ = math_variables.insert(name.to_string(), format!("{i}"));
                                Some(Empty)
                            },
                            Err(err) => Some(Error{msg: format!("Error while parsing math: {}\n", err), meta: meta.clone()}),
                        }
                    }
                } else {
                    None
                }
            },
            _ => None,
        }
    };

    asm.root.traverse_tree(&mut registering_define);
}

/// Replace defined constant with their expanded values in a line of text.
/// Return the new words and true if at list a word have been replaced.
fn apply_define_in_line(line: &[String], map: &HashMap<String, Vec<String>>) -> (Vec<String>, bool) {
    let mut applied_define = false;

    let mut new_source = Vec::<String>::new();
    for txt in line {
        if let Some(substitution) = map.get(txt) {
            applied_define = true;
            for word in substitution {
                new_source.push(word.to_string());
            }
        } else {
            new_source.push(txt.to_string());
        }
    }
    (new_source, applied_define)
}

/// Traverse the tree and replace text with are define names with appropriate
/// values. Return true if a defines have been expanded.
fn apply_define(asm: &mut Assembler) -> bool {
    let mut applied_define = false;

    let mut applying_define = |node: &AsmNode| -> Option<AsmNode> {
        if let Source{code, meta} = node {
            let (new_source, applied_a_define) = apply_define_in_line(&code, &asm.defines);
            if applied_a_define {
                applied_define = true;
            }

            Some(Source{code: new_source, meta: meta.clone()})

        } else {
            None
        }
    };

    asm.root.traverse_tree(&mut applying_define);
    applied_define
}

/// Register all define and apply them. Return true is a define have been
/// applied.
pub fn handle_define(asm: &mut Assembler) -> bool {
    register_define(asm);
    apply_define(asm)
}

/* --------------------------------- Testing -------------------------------- */

#[test]
fn test_register_define() {
    let mut assembler = Assembler::from_text("@define name 123\n@define name_2 234 345\nnormal text\n@define name error\n");
    register_define(&mut assembler);
    assert_eq!(assembler.root.to_string().as_str(), "normal text\n! Error, define name has already been defined.\n file: ./__asm_init line: 4 raw_line: @define name error\n");
    assert_eq!(assembler.defines, HashMap::from([
          ("name".to_string(),   vec!["123".to_string()]),
          ("name_2".to_string(), vec!["234".to_string(), "345".to_string()]),
    ]));
}

#[test]
fn test_contains_math_chars() {
    assert_eq!(math_parse::contains_math_char("abc+d"), true);
    assert_eq!(math_parse::contains_math_char("abcd"), false);
}

#[test]
fn test_apply_define() {
    let mut assembler = Assembler::from_text("@define name 123\n@define name_2 234 345\nnormal text\nname name_2  name\n");
    register_define(&mut assembler);
    apply_define(&mut assembler);
    assert_eq!(assembler.root.to_string().as_str(), "normal text\n123 234 345 123\n");
    assert_eq!(assembler.defines, HashMap::from([
          ("name".to_string(),   vec!["123".to_string()]),
          ("name_2".to_string(), vec!["234".to_string(), "345".to_string()]),
    ]));
}

#[test]
fn test_define_math() {
    let mut assembler = Assembler::from_text("@define-math name 123\n@define-math name_2 name * 2\nnormal text\nname name_2  name\n");
    register_define(&mut assembler);
    apply_define(&mut assembler);
    assert_eq!(assembler.root.to_string().as_str(), "normal text\n123 246 123\n");
    assert_eq!(assembler.defines, HashMap::from([
          ("name".to_string(),   vec!["123".to_string()]),
          ("name_2".to_string(), vec!["246".to_string()]),
    ]));
}