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use std::fs;
use std::sync::Arc;

use cairo_lang_filesystem::db::FilesGroup;
use cairo_lang_filesystem::ids::{FileId, FileKind, FileLongId, VirtualFile};
use cairo_lang_utils::ordered_hash_map::OrderedHashMap;
use smol_str::SmolStr;

use crate::utils::{get_syntax_root_and_diagnostics, SimpleParserDatabase};

pub fn read_file(filename: &str) -> String {
    fs::read_to_string(filename)
        .unwrap_or_else(|_| panic!("Something went wrong reading file {filename}"))
}

pub fn get_diagnostics(
    inputs: &OrderedHashMap<String, String>,
    _args: &OrderedHashMap<String, String>,
) -> Result<OrderedHashMap<String, String>, String> {
    let db = &SimpleParserDatabase::default();
    let code = &inputs["cairo_code"];

    let file_id = create_virtual_file(db, "dummy_file.cairo", code);
    let (_, diagnostics) = get_syntax_root_and_diagnostics(db, file_id, code);
    Ok(OrderedHashMap::from([("expected_diagnostics".into(), diagnostics.format(db))]))
}

// TODO(yuval): stop virtual files for tests anymore. See semantic tests.
/// Creates a virtual file with the given content and returns its ID.
pub fn create_virtual_file(
    db: &SimpleParserDatabase,
    file_name: impl Into<SmolStr>,
    content: &str,
) -> FileId {
    db.intern_file(FileLongId::Virtual(VirtualFile {
        parent: None,
        name: file_name.into(),
        content: Arc::new(content.into()),
        diagnostics_mappings: Default::default(),
        kind: FileKind::Module,
    }))
}