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//! Javascript minifier implemented in rust.
//!
//! # Cargo features
//!
//! ## `debug`
//!
//! If you enable this cargo feature and set the environment variable named
//! `SWC_RUN` to `1`, the minifier will validate the code using node before each
//! step.
//!
//! Note: Passes should be visited only with [Module] and it's an error to feed
//! them something other. Don't call methods like `visit_mut_script` nor
//! `visit_mut_module_items`.
#![deny(clippy::all)]
#![allow(clippy::blocks_in_if_conditions)]
#![allow(clippy::collapsible_else_if)]
#![allow(clippy::collapsible_if)]
#![allow(clippy::vec_box)]

pub use crate::pass::unique_scope::unique_scope;
use crate::{
    compress::compressor,
    marks::Marks,
    metadata::info_marker,
    option::{ExtraOptions, MinifyOptions},
    pass::{
        compute_char_freq::compute_char_freq, expand_names::name_expander, global_defs,
        mangle_names::name_mangler, mangle_props::mangle_properties,
        precompress::precompress_optimizer,
    },
};
use mode::Minification;
use pass::postcompress::postcompress_optimizer;
use swc_common::{comments::Comments, sync::Lrc, SourceMap, GLOBALS};
use swc_ecma_ast::Module;
use swc_ecma_visit::{FoldWith, VisitMutWith};
use swc_timer::timer;
use timing::Timings;

mod analyzer;
mod compress;
mod debug;
pub mod eval;
pub mod marks;
mod metadata;
mod mode;
pub mod option;
mod pass;
pub mod timing;
mod util;

const DISABLE_BUGGY_PASSES: bool = true;
const MAX_PAR_DEPTH: u8 = 3;

#[inline]
pub fn optimize(
    mut m: Module,
    _cm: Lrc<SourceMap>,
    comments: Option<&dyn Comments>,
    mut timings: Option<&mut Timings>,
    options: &MinifyOptions,
    extra: &ExtraOptions,
) -> Module {
    let _timer = timer!("minify");

    let marks = Marks::new();

    if let Some(defs) = options.compress.as_ref().map(|c| &c.global_defs) {
        let _timer = timer!("inline global defs");
        // Apply global defs.
        //
        // As terser treats `CONFIG['VALUE']` and `CONFIG.VALUE` differently, we don't
        // have to see if optimized code matches global definition and we can run
        // this at startup.

        if !defs.is_empty() {
            let defs = defs.iter().map(|(k, v)| (k.clone(), v.clone())).collect();
            m.visit_mut_with(&mut global_defs::globals_defs(defs, extra.top_level_mark));
        }
    }

    if let Some(options) = &options.compress {
        let _timer = timer!("precompress");

        m.visit_mut_with(&mut precompress_optimizer(options, marks));
    }

    m.visit_mut_with(&mut info_marker(comments, marks, extra.top_level_mark));
    m.visit_mut_with(&mut unique_scope());

    if options.wrap {
        // TODO: wrap_common_js
        // toplevel = toplevel.wrap_commonjs(options.wrap);
    }

    if options.enclose {
        // TODO: enclose
        // toplevel = toplevel.wrap_enclose(options.enclose);
    }

    // We don't need validation.

    if let Some(ref mut _t) = timings {
        // TODO: store `rename`
    }

    // Noop.
    // https://github.com/mishoo/UglifyJS2/issues/2794
    if options.rename && DISABLE_BUGGY_PASSES {
        // toplevel.figure_out_scope(options.mangle);
        // TODO: Pass `options.mangle` to name expander.
        m.visit_mut_with(&mut name_expander());
    }

    if let Some(ref mut t) = timings {
        t.section("compress");
    }
    if let Some(options) = &options.compress {
        {
            let _timer = timer!("compress ast");

            m = GLOBALS.with(|globals| {
                m.fold_with(&mut compressor(globals, marks, options, &Minification))
            });
        }

        // Again, we don't need to validate ast

        let _timer = timer!("postcompress");

        m.visit_mut_with(&mut postcompress_optimizer(options));
    }

    if let Some(ref mut _t) = timings {
        // TODO: store `scope`
    }
    if options.mangle.is_some() {
        // toplevel.figure_out_scope(options.mangle);
    }

    if let Some(ref mut t) = timings {
        t.section("mangle");
    }

    if let Some(mangle) = &options.mangle {
        let _timer = timer!("mangle names");
        // TODO: base54.reset();

        let char_freq_info = compute_char_freq(&m);
        m.visit_mut_with(&mut name_mangler(mangle.clone(), char_freq_info, marks));
    }

    if let Some(property_mangle_options) = options.mangle.as_ref().and_then(|o| o.props.as_ref()) {
        mangle_properties(&mut m, property_mangle_options.clone());
    }

    if let Some(ref mut t) = timings {
        t.section("hygiene");
    }

    if let Some(ref mut t) = timings {
        t.end_section();
    }

    m
}