//! Byte-equivalence tests for Vue + Svelte targets against JS baselines.

use std::path::PathBuf;

use mizan_codegen::config::{Config, SourceConfig};
use mizan_codegen::emit::CodegenTarget;
use mizan_codegen::emit::svelte::SvelteAdapter;
use mizan_codegen::emit::vue::VueAdapter;
use mizan_codegen::fetch::parse_ir_from_str;


fn load_ir() -> mizan_codegen::ir::MizanIR {
    let path = PathBuf::from(env!("CARGO_MANIFEST_DIR")).join("tests/fixtures/afi_ir.kdl");
    parse_ir_from_str(&std::fs::read_to_string(&path).unwrap()).unwrap()
}


fn fixture_config(target: &str) -> Config {
    Config {
        project_id: None,
        output: PathBuf::from("/tmp"),
        targets: vec![target.to_string()],
        source: SourceConfig { fastapi: None, django: None, rust: None, script: None },
        rust_kernel: None,
        rust_crate_name: None,
    }
}


fn assert_byte_equal(actual: &str, baseline_path: &str, label: &str) {
    let baseline = std::fs::read_to_string(
        PathBuf::from(env!("CARGO_MANIFEST_DIR")).join(baseline_path),
    ).unwrap();
    if actual != baseline {
        for (lineno, (a, b)) in actual.lines().zip(baseline.lines()).enumerate() {
            if a != b {
                panic!(
                    "{label} diverges at line {}:\n  expected: {b:?}\n  actual:   {a:?}",
                    lineno + 1,
                );
            }
        }
        panic!(
            "{label} diverges in length: actual={} expected={}",
            actual.len(), baseline.len(),
        );
    }
}


#[test]
fn vue_target_byte_match() {
    let ir = load_ir();
    let files = VueAdapter.emit(&ir, &fixture_config("vue"));
    assert_eq!(files.len(), 1);
    assert_byte_equal(&files[0].content, "tests/fixtures/baselines/vue/vue.ts", "vue.ts");
}


#[test]
fn svelte_target_byte_match() {
    let ir = load_ir();
    let files = SvelteAdapter.emit(&ir, &fixture_config("svelte"));
    assert_eq!(files.len(), 1);
    assert_byte_equal(&files[0].content, "tests/fixtures/baselines/svelte/svelte.ts", "svelte.ts");
}