#![allow(
    clippy::all,
    clippy::pedantic,
    clippy::nursery,
    clippy::cargo,
    clippy::restriction
)]

use rottlib::arena::Arena;
use rottlib::diagnostics::Diagnostic;
use rottlib::lexer::TokenizedFile;
use rottlib::parser::Parser;

/// Lexer-focused fixtures.
///
/// Keep these small: the goal is to inspect lexer diagnostics and delimiter
/// recovery behavior, not full parser behavior.
const TEST_CASES: &[(&str, &str)] = &[
    // L0001: invalid or unknown token
    (
        "files/L0001_01.uc",
        "`",
    ),

    // L0002: unexpected closing delimiter
    (
        "files/L0002_01.uc",
        "]",
    ),

    // L0003: unclosed delimiter before later closing delimiter
    //
    // The `}` can still recover by matching the earlier `{`.
    (
        "files/L0003_01.uc",
        "{\n    foo(\n}\n",
    ),

    // L0004: mismatched closing delimiter
    (
        "files/L0004_01.uc",
        "(]",
    ),

    // L0005: unclosed delimiter at end of file
    (
        "files/L0005_01.uc",
        "foo(",
    ),

    // Mixed recovery case:
    //
    // `)` recovers by matching `(` after treating `[` as unclosed;
    // the following `]` is then unexpected.
    (
        "files/L_mixed_01.uc",
        "([)]",
    ),
];

/// If true, also run the parser after tokenization.
///
/// For lexer-focused fixtures this is usually noisy, so keep it off unless you
/// want to inspect how parser recovery behaves after lexer diagnostics.
const RUN_PARSER: bool = false;

/// If true, print the parsed expression using Debug formatting.
const PRINT_PARSED_EXPR: bool = false;

/// If true, print diagnostics even when parsing returned a value.
const ALWAYS_PRINT_DIAGNOSTICS: bool = true;

fn main() {
    let arena = Arena::new();

    let mut had_any_problem = false;

    for (idx, (label, source)) in TEST_CASES.iter().enumerate() {
        println!("============================================================");
        println!("Case {}: {}", idx + 1, label);
        println!("------------------------------------------------------------");

        let tf = TokenizedFile::tokenize(source);

        let lexer_diagnostics = tf.diagnostics();

        if lexer_diagnostics.is_empty() {
            println!("Lexer diagnostics: none");
        } else {
            had_any_problem = true;

            if ALWAYS_PRINT_DIAGNOSTICS {
                println!("Lexer diagnostics:");
                for diag in lexer_diagnostics {
                    render_diagnostic(diag, &tf, Some(label), false);
                }
            }
        }

        if RUN_PARSER {
            let mut parser = Parser::new(&tf, &arena);
            let expr = parser.parse_expression();

            if PRINT_PARSED_EXPR {
                println!("Parsed expression:");
                println!("{expr:#?}");
            }

            if parser.diagnostics.is_empty() {
                println!("Parser diagnostics: none");
            } else {
                had_any_problem = true;

                if ALWAYS_PRINT_DIAGNOSTICS {
                    println!("Parser diagnostics:");
                    for diag in &parser.diagnostics {
                        render_diagnostic(diag, &tf, Some(label), false);
                    }
                }
            }
        }

        println!();
    }

    println!("============================================================");

    if had_any_problem {
        println!("Done. At least one case had lexer or parser diagnostics.");
        std::process::exit(1);
    } else {
        println!("Done. All cases completed without diagnostics.");
    }
}

fn render_diagnostic(
    diag: &Diagnostic,
    file: &TokenizedFile<'_>,
    file_name: Option<&str>,
    _colors: bool,
) {
    diag.render(file, file_name.unwrap_or("<default>"));
}