#! /usr/bin/env node

var U = require("./node");
var path = require("path");
var fs = require("fs");
var assert = require("assert");
var sandbox = require("./sandbox");
var semver = require("semver");

var tests_dir = path.dirname(module.filename);
var failures = 0;
var failed_files = {};
var minify_options = require("./ufuzz.json").map(JSON.stringify);

run_compress_tests();
if (failures) {
    console.error("\n!!! Failed " + failures + " test cases.");
    console.error("!!! " + Object.keys(failed_files).join(", "));
    process.exit(1);
}
console.log();
require("./mocha.js");

/* -----[ utils ]----- */

function evaluate(code) {
    if (code instanceof U.AST_Node) code = make_code(code, { beautify: true });
    return new Function("return(" + code + ")")();
}

function log() {
    console.log("%s", tmpl.apply(null, arguments));
}

function make_code(ast, options) {
    var stream = U.OutputStream(options);
    ast.print(stream);
    return stream.get();
}

function parse_test(file) {
    var script = fs.readFileSync(file, "utf8");
    // TODO try/catch can be removed after fixing https://github.com/mishoo/UglifyJS2/issues/348
    try {
        var ast = U.parse(script, {
            filename: file
        });
    } catch (e) {
        console.log("Caught error while parsing tests in " + file + "\n");
        console.log(e);
        throw e;
    }
    var tests = {};
    var tw = new U.TreeWalker(function(node, descend) {
        if (node instanceof U.AST_LabeledStatement
            && tw.parent() instanceof U.AST_Toplevel) {
            var name = node.label.name;
            if (name in tests) {
                throw new Error('Duplicated test name "' + name + '" in ' + file);
            }
            tests[name] = get_one_test(name, node.body);
            return true;
        }
        if (!(node instanceof U.AST_Toplevel)) croak(node);
    });
    ast.walk(tw);
    return tests;

    function croak(node) {
        throw new Error(tmpl("Can't understand test file {file} [{line},{col}]\n{code}", {
            file: file,
            line: node.start.line,
            col: node.start.col,
            code: make_code(node, { beautify: false })
        }));
    }

    function read_string(stat) {
        if (stat.TYPE == "SimpleStatement") {
            var body = stat.body;
            switch(body.TYPE) {
              case "String":
                return body.value;
              case "Array":
                return body.elements.map(function(element) {
                    if (element.TYPE !== "String")
                        throw new Error("Should be array of strings");
                    return element.value;
                }).join("\n");
            }
        }
        throw new Error("Should be string or array of strings");
    }

    function get_one_test(name, block) {
        var test = { name: name, options: {} };
        var tw = new U.TreeWalker(function(node, descend) {
            if (node instanceof U.AST_Assign) {
                if (!(node.left instanceof U.AST_SymbolRef)) {
                    croak(node);
                }
                var name = node.left.name;
                test[name] = evaluate(node.right);
                return true;
            }
            if (node instanceof U.AST_LabeledStatement) {
                var label = node.label;
                assert.ok([
                    "input",
                    "expect",
                    "expect_exact",
                    "expect_warnings",
                    "expect_stdout",
                    "node_version",
                ].indexOf(label.name) >= 0, tmpl("Unsupported label {name} [{line},{col}]", {
                    name: label.name,
                    line: label.start.line,
                    col: label.start.col
                }));
                var stat = node.body;
                if (label.name == "expect_exact" || label.name == "node_version") {
                    test[label.name] = read_string(stat);
                } else if (label.name == "expect_stdout") {
                    var body = stat.body;
                    if (body instanceof U.AST_Boolean) {
                        test[label.name] = body.value;
                    } else if (body instanceof U.AST_Call) {
                        var ctor = global[body.expression.name];
                        assert.ok(ctor === Error || ctor.prototype instanceof Error, tmpl("Unsupported expect_stdout format [{line},{col}]", {
                            line: label.start.line,
                            col: label.start.col
                        }));
                        test[label.name] = ctor.apply(null, body.args.map(function(node) {
                            assert.ok(node instanceof U.AST_Constant, tmpl("Unsupported expect_stdout format [{line},{col}]", {
                                line: label.start.line,
                                col: label.start.col
                            }));
                            return node.value;
                        }));
                    } else {
                        test[label.name] = read_string(stat) + "\n";
                    }
                } else {
                    test[label.name] = stat;
                }
                return true;
            }
        });
        block.walk(tw);
        return test;
    }
}

// Try to reminify original input with standard options
// to see if it matches expect_stdout.
function reminify(orig_options, input_code, input_formatted, expect_stdout) {
    for (var i = 0; i < minify_options.length; i++) {
        var options = JSON.parse(minify_options[i]);
        if (options.compress) [
            "keep_fargs",
            "keep_fnames",
        ].forEach(function(name) {
            if (name in orig_options) {
                options.compress[name] = orig_options[name];
            }
        });
        var options_formatted = JSON.stringify(options, null, 4);
        var result = U.minify(input_code, options);
        if (result.error) {
            log("!!! failed input reminify\n---INPUT---\n{input}\n---OPTIONS---\n{options}\n--ERROR---\n{error}\n\n", {
                input: input_formatted,
                options: options_formatted,
                error: result.error,
            });
            return false;
        } else {
            var stdout = run_code(result.code);
            if (typeof expect_stdout != "string" && typeof stdout != "string" && expect_stdout.name == stdout.name) {
                stdout = expect_stdout;
            }
            if (!sandbox.same_stdout(expect_stdout, stdout)) {
                log("!!! failed running reminified input\n---INPUT---\n{input}\n---OPTIONS---\n{options}\n---OUTPUT---\n{output}\n---EXPECTED {expected_type}---\n{expected}\n---ACTUAL {actual_type}---\n{actual}\n\n", {
                    input: input_formatted,
                    options: options_formatted,
                    output: result.code,
                    expected_type: typeof expect_stdout == "string" ? "STDOUT" : "ERROR",
                    expected: expect_stdout,
                    actual_type: typeof stdout == "string" ? "STDOUT" : "ERROR",
                    actual: stdout,
                });
                return false;
            }
        }
    }
    return true;
}

function run_code(code) {
    var result = sandbox.run_code(code, true);
    return typeof result == "string" ? result.replace(/\u001b\[\d+m/g, "") : result;
}

function run_compress_tests() {
    var dir = path.resolve(tests_dir, "compress");
    fs.readdirSync(dir).filter(function(name) {
        return /\.js$/i.test(name);
    }).forEach(function(file) {
        log("--- {file}", { file: file });
        function test_case(test) {
            log("    Running test [{name}]", { name: test.name });
            var output_options = test.beautify || {};
            var expect;
            if (test.expect) {
                expect = make_code(to_toplevel(test.expect, test.mangle), output_options);
            } else {
                expect = test.expect_exact;
            }
            var input = to_toplevel(test.input, test.mangle);
            var input_code = make_code(input);
            var input_formatted = make_code(test.input, {
                beautify: true,
                quote_style: 3,
                keep_quoted_props: true
            });
            try {
                U.parse(input_code);
            } catch (ex) {
                log("!!! Cannot parse input\n---INPUT---\n{input}\n--PARSE ERROR--\n{error}\n\n", {
                    input: input_formatted,
                    error: ex,
                });
                return false;
            }
            var options = U.defaults(test.options, {
                warnings: false
            });
            var warnings_emitted = [];
            var original_warn_function = U.AST_Node.warn_function;
            if (test.expect_warnings) {
                U.AST_Node.warn_function = function(text) {
                    warnings_emitted.push("WARN: " + text);
                };
                if (!options.warnings) options.warnings = true;
            }
            if (test.mangle && test.mangle.properties && test.mangle.properties.keep_quoted) {
                var quoted_props = test.mangle.properties.reserved;
                if (!Array.isArray(quoted_props)) quoted_props = [];
                test.mangle.properties.reserved = quoted_props;
                U.reserve_quoted_keys(input, quoted_props);
            }
            if (test.rename) {
                input.figure_out_scope(test.mangle);
                input.expand_names(test.mangle);
            }
            var cmp = new U.Compressor(options, true);
            var output = cmp.compress(input);
            output.figure_out_scope(test.mangle);
            if (test.mangle) {
                output.compute_char_frequency(test.mangle);
                output.mangle_names(test.mangle);
                if (test.mangle.properties) {
                    output = U.mangle_properties(output, test.mangle.properties);
                }
            }
            output = make_code(output, output_options);
            if (expect != output) {
                log("!!! failed\n---INPUT---\n{input}\n---OUTPUT---\n{output}\n---EXPECTED---\n{expected}\n\n", {
                    input: input_formatted,
                    output: output,
                    expected: expect
                });
                return false;
            }
            // expect == output
            try {
                U.parse(output);
            } catch (ex) {
                log("!!! Test matched expected result but cannot parse output\n---INPUT---\n{input}\n---OUTPUT---\n{output}\n--REPARSE ERROR--\n{error}\n\n", {
                    input: input_formatted,
                    output: output,
                    error: ex,
                });
                return false;
            }
            if (test.expect_warnings) {
                U.AST_Node.warn_function = original_warn_function;
                var expected_warnings = make_code(test.expect_warnings, {
                    beautify: false,
                    quote_style: 2, // force double quote to match JSON
                });
                warnings_emitted = warnings_emitted.map(function(input) {
                    return input.split(process.cwd() + path.sep).join("").split(path.sep).join("/");
                });
                var actual_warnings = JSON.stringify(warnings_emitted);
                if (expected_warnings != actual_warnings) {
                    log("!!! failed\n---INPUT---\n{input}\n---EXPECTED WARNINGS---\n{expected_warnings}\n---ACTUAL WARNINGS---\n{actual_warnings}\n\n", {
                        input: input_formatted,
                        expected_warnings: expected_warnings,
                        actual_warnings: actual_warnings,
                    });
                    return false;
                }
            }
            if (test.expect_stdout
                && (!test.node_version || semver.satisfies(process.version, test.node_version))) {
                var stdout = run_code(input_code);
                if (test.expect_stdout === true) {
                    test.expect_stdout = stdout;
                }
                if (!sandbox.same_stdout(test.expect_stdout, stdout)) {
                    log("!!! Invalid input or expected stdout\n---INPUT---\n{input}\n---EXPECTED {expected_type}---\n{expected}\n---ACTUAL {actual_type}---\n{actual}\n\n", {
                        input: input_formatted,
                        expected_type: typeof test.expect_stdout == "string" ? "STDOUT" : "ERROR",
                        expected: test.expect_stdout,
                        actual_type: typeof stdout == "string" ? "STDOUT" : "ERROR",
                        actual: stdout,
                    });
                    return false;
                }
                stdout = run_code(output);
                if (!sandbox.same_stdout(test.expect_stdout, stdout)) {
                    log("!!! failed\n---INPUT---\n{input}\n---EXPECTED {expected_type}---\n{expected}\n---ACTUAL {actual_type}---\n{actual}\n\n", {
                        input: input_formatted,
                        expected_type: typeof test.expect_stdout == "string" ? "STDOUT" : "ERROR",
                        expected: test.expect_stdout,
                        actual_type: typeof stdout == "string" ? "STDOUT" : "ERROR",
                        actual: stdout,
                    });
                    return false;
                }
                if (!reminify(test.options, input_code, input_formatted, test.expect_stdout)) {
                    return false;
                }
            }
            return true;
        }
        var tests = parse_test(path.resolve(dir, file));
        for (var i in tests) if (tests.hasOwnProperty(i)) {
            if (!test_case(tests[i])) {
                failures++;
                failed_files[file] = 1;
            }
        }
    });
}

function tmpl() {
    return U.string_template.apply(null, arguments);
}

function to_toplevel(input, mangle_options) {
    if (!(input instanceof U.AST_BlockStatement)) throw new Error("Unsupported input syntax");
    var directive = true;
    var offset = input.start.line;
    var tokens = [];
    var toplevel = new U.AST_Toplevel(input.transform(new U.TreeTransformer(function(node) {
        if (U.push_uniq(tokens, node.start)) node.start.line -= offset;
        if (!directive || node === input) return;
        if (node instanceof U.AST_SimpleStatement && node.body instanceof U.AST_String) {
            return new U.AST_Directive(node.body);
        } else {
            directive = false;
        }
    })));
    toplevel.figure_out_scope(mangle_options);
    return toplevel;
}