use aho_corasick::{AhoCorasick, AhoCorasickBuilder};

// TODO figure out why this code takes ~70ms to munge the javascript. By comparison just writing a
// bunch of chainged string.replace( , ).replace( , ).replace .... takes about 16ms.
        let mut patterns = Vec::new();
        let mut replace_with = Vec::new();

        patterns.push("'REPLACE_ME_WITH_JSON_STRINGIFY'");
        replace_with.push("JSON.stringify(x)");
    
        patterns.push("$elm$json$Json$Decode$fail('REPLACE_ME_WITH_BYTES_DECODER');");
        replace_with.push(r#"
        _Json_decodePrim(function(value) {
            return (typeof value === 'object' && value instanceof DataView)
                ? $elm$core$Result$Ok(value)
                    : _Json_expecting('a DataView', value);
        });
        "#);
        
        patterns.push(";}(this));");
        replace_with.push(";}(globalThis));");
        
        
        // let mut final_script = data

        if sqlite_path.is_some() {
            patterns.push("var $author$project$Astrid$Query$execute = function (query) {\n\treturn $author$project$Astrid$Query$dummyExecute;\n};");
            replace_with.push(include_str!("fixtures/sql-client-integration.js"));

            patterns.push("var $author$project$Astrid$Query$fetch = F3(\n\tfunction (sql, parameters, decoder) {\n\t\treturn $author$project$Astrid$Query$Dummy;\n\t});");
            replace_with.push("var $author$project$Astrid$Query$fetch = _Query_fetchAll;");

            patterns.push("var $author$project$Astrid$Query$fetchOne = F3(\n\tfunction (sql, parameters, decoder) {\n\t\treturn $author$project$Astrid$Query$Dummy;\n\t});");
            replace_with.push("var $author$project$Astrid$Query$fetchOne = _Query_fetchOne;");

            patterns.push("var $author$project$Astrid$Query$map5 = F6(\n\tfunction (f, a, b, c, d, e) {\n\t\treturn $author$project$Astrid$Query$Dummy;\n\t});");
            replace_with.push(r#"var $author$project$Astrid$Query$map5 = _Query_map5;"#);
            
            patterns.push("var $author$project$Astrid$Query$map4 = F5(\n\tfunction (f, a, b, c, d) {\n\t\treturn $author$project$Astrid$Query$Dummy;\n\t});");
            replace_with.push(r#"var $author$project$Astrid$Query$map4 = _Query_map4;"#);

            patterns.push("var $author$project$Astrid$Query$map3 = F4(\n\tfunction (f, a, b, c) {\n\t\treturn $author$project$Astrid$Query$Dummy;\n\t});");
            replace_with.push(r#"var $author$project$Astrid$Query$map3 = _Query_map3;"#);
            
            patterns.push("var $author$project$Astrid$Query$map2 = F3(\n\tfunction (f, a, b) {\n\t\treturn $author$project$Astrid$Query$Dummy;\n\t});");
            replace_with.push(r#"var $author$project$Astrid$Query$map2 = _Query_map2;"#);
            
            patterns.push("var $author$project$Astrid$Query$map = F2(\n\tfunction (f, a) {\n\t\treturn $author$project$Astrid$Query$Dummy;\n\t});");
            replace_with.push(r#"var $author$project$Astrid$Query$map = _Query_map1;"#);
            
            patterns.push("var $author$project$Astrid$Query$andThen = F2(\n\tfunction (f, q) {\n\t\treturn $author$project$Astrid$Query$Dummy;\n\t});");
            replace_with.push(r#"var $author$project$Astrid$Query$andThen = _Query_andThen;"#);
        }
        debug_assert!(patterns.len() == replace_with.len());

        // let mut final_script = Vec::with_capacity(data.len() + 8 * 1024);

        let span = info_span!("build aho-corasick patterns");
        let timing_guard = span.enter();
        //let ac = AhoCorasick::new(&patterns);
        let ac = AhoCorasickBuilder::new()
            .auto_configure(&patterns)
            .build(&patterns);
        drop(timing_guard);
        let span = info_span!("run replacements");
        let timing_guard = span.enter();
        for _ in ac.find_iter(data.as_bytes()) {
         
        }
        drop(timing_guard);
        let mut final_script = ac.replace_all_bytes(data.as_bytes(), &replace_with);