class TestSuiteModule {
    constructor() {
        this.commands = {};
        this.terminal = null;
        this._results = [];
        this._startTime = 0;
    }

    requirements() {
        return { met: true, missing: [] };
    }

    getHelpInfo() {
        return {
            'test': 'test [name|auto|list] — Run test suite (no args = all, auto = non-destructive only)',
        };
    }

    registerCommands() {
        this.commands['test'] = (args) => this._run(args);
    }

    // ── Test definitions ──

    _tests() {
        return {
            // ── Filesystem ──
            'ls-root': {
                desc: 'ls lists files in root',
                cmd: 'ls',
                expect: (out) => out.split('\n').length >= 1,
                destructive: false
            },
            'cd-pwd': {
                desc: 'cd and pwd work together',
                cmd_parts: [
                    { cmd: 'cd /' },
                    { cmd: 'pwd', expect: (out) => out.includes('/') },
                ],
                destructive: false
            },
            'cat-put': {
                desc: 'put creates and cat reads a file',
                cmd_parts: [
                    { cmd: 'put /tmp/__test_hello.txt "Hello Test Suite"' },
                    { cmd: 'cat /tmp/__test_hello.txt', expect: (out) => out.includes('Hello Test Suite') },
                    { cmd: 'rm /tmp/__test_hello.txt' },
                ],
                destructive: true
            },
            'grep-file': {
                desc: 'grep finds content in a file',
                cmd_parts: [
                    { cmd: 'put /tmp/__test_grep_data.txt "apple\\nbanana\\ncherry\\napple"' },
                    { cmd: 'grep apple /tmp/__test_grep_data.txt', expect: (out) => out.includes('apple') && out.split('\n').filter(l => l).length >= 2 },
                    { cmd: 'rm /tmp/__test_grep_data.txt' },
                ],
                destructive: true
            },

            // ── BusyBox ──
            'which-ls': {
                desc: 'which finds ls command',
                cmd: 'which ls',
                expect: (out) => out.includes('ls'),
                destructive: false
            },
            'env-vars': {
                desc: 'env shows environment variables',
                cmd: 'env',
                expect: (out) => out.includes('SHELL=') && out.includes('USER=') && out.includes('PWD='),
                destructive: false
            },
            'date-formats': {
                desc: 'date shows multiple time formats',
                cmd: 'date',
                expect: (out) => out.includes('ISO:') && out.includes('UTC:') && out.includes('Unix:'),
                destructive: false
            },
            'cal-output': {
                desc: 'cal generates ASCII calendar',
                cmd: 'cal 5 2026',
                expect: (out) => out.includes('May') && out.includes('2026') && out.includes('Su'),
                destructive: false
            },
            'seq-range': {
                desc: 'seq generates number sequence',
                cmd: 'seq 3 7',
                expect: (out) => out.includes('3') && out.includes('5') && out.includes('7'),
                destructive: false
            },
            'base64-encode': {
                desc: 'base64 encodes and decodes',
                cmd_parts: [
                    { cmd: 'base64 hello', expect: (out) => out.trim() === 'aGVsbG8=' },
                    { cmd: 'base64 -d aGVsbG8=', expect: (out) => out.trim() === 'hello' },
                ],
                destructive: false
            },
            'printf-format': {
                desc: 'printf formats strings',
                cmd: 'printf "Hello %s, you are %d" World 42',
                expect: (out) => out.includes('Hello World, you are 42'),
                destructive: false
            },
            'whoami-user': {
                desc: 'whoami returns a username',
                cmd: 'whoami',
                expect: (out) => out.trim().length > 0,
                destructive: false
            },
            'basename-dirname': {
                desc: 'basename and dirname parse paths',
                cmd_parts: [
                    { cmd: 'basename /a/b/c.txt', expect: (out) => out.trim() === 'c.txt' },
                    { cmd: 'dirname /a/b/c.txt', expect: (out) => out.trim() === '/a/b' },
                ],
                destructive: false
            },

            // ── Shell ──
            'pipe-ls-grep': {
                desc: 'ls | grep filters terminal output',
                cmd: 'ls | grep skills',
                expect: (out) => out.includes('skills'),
                destructive: false
            },
            'redirect-write': {
                desc: '> redirect writes output to VFS file',
                cmd_parts: [
                    { cmd: 'echo "pipe test line 1" > /tmp/__test_redirect.txt' },
                    { cmd: 'cat /tmp/__test_redirect.txt', expect: (out) => out.includes('pipe test line 1') },
                    { cmd: 'rm /tmp/__test_redirect.txt' },
                ],
                destructive: true
            },
            'redirect-append': {
                desc: '>> append adds to existing file',
                cmd_parts: [
                    { cmd: 'echo "line A" > /tmp/__test_append.txt' },
                    { cmd: 'echo "line B" >> /tmp/__test_append.txt' },
                    { cmd: 'cat /tmp/__test_append.txt', expect: (out) => out.includes('line A') && out.includes('line B') },
                    { cmd: 'rm /tmp/__test_append.txt' },
                ],
                destructive: true
            },
            'chain-and': {
                desc: '&& runs second command on success',
                cmd: 'touch /tmp/__test_chain && rm /tmp/__test_chain && echo "chain ok"',
                expect: (out) => out.includes('chain ok'),
                destructive: false
            },
            'chain-or': {
                desc: '|| runs second command on failure',
                cmd: 'rm /tmp/__test_nonexistent_xyz || echo "or fallback"',
                expect: (out) => out.includes('or fallback'),
                destructive: false
            },
            'sequence-semi': {
                desc: '; runs commands in sequence',
                cmd: 'echo "first" ; echo "second"',
                expect: (out) => out.includes('first') && out.includes('second'),
                destructive: false
            },
            'export-var': {
                desc: 'export and $VAR substitution works',
                cmd_parts: [
                    { cmd: 'export TESTVAR=hello42' },
                    { cmd: 'echo $TESTVAR', expect: (out) => out.includes('hello42') },
                    { cmd: 'unset TESTVAR' },
                ],
                destructive: false
            },
            'redirect-input': {
                desc: '< reads file as stdin',
                cmd_parts: [
                    { cmd: 'echo "hello from stdin" > /tmp/__test_stdin.txt' },
                    { cmd: 'cat /tmp/__test_stdin.txt', expect: (out) => out.includes('hello from stdin') },
                    { cmd: 'rm /tmp/__test_stdin.txt' },
                ],
                destructive: true
            },

            // ── CryptoGzip ──
            'gzip-file': {
                desc: 'gzip compresses a VFS file',
                cmd_parts: [
                    { cmd: 'echo "repetitive data aaaaa bbbbb ccccc" > /tmp/__test_gzip_in.txt' },
                    { cmd: 'gzip /tmp/__test_gzip_in.txt' },
                    { cmd: 'cat /tmp/__test_gzip_in.txt.gz', expect: (out) => out.length > 0 },
                    { cmd: 'rm /tmp/__test_gzip_in.txt.gz' },
                ],
                destructive: true
            },
            'gunzip-file': {
                desc: 'gunzip decompresses',
                cmd_parts: [
                    { cmd: 'echo "gunzip me please" > /tmp/__test_gunzip.txt' },
                    { cmd: 'gzip /tmp/__test_gunzip.txt' },
                    { cmd: 'gunzip /tmp/__test_gunzip.txt.gz' },
                    { cmd: 'cat /tmp/__test_gunzip.txt', expect: (out) => out.includes('gunzip me please') },
                    { cmd: 'rm /tmp/__test_gunzip.txt' },
                ],
                destructive: true
            },
            'encrypt-decrypt': {
                desc: 'encrypt and decrypt roundtrip',
                cmd_parts: [
                    { cmd: 'echo "secret data xyz" > /tmp/__test_crypt.txt' },
                    { cmd: 'encrypt /tmp/__test_crypt.txt testkey123' },
                    { cmd: 'rm /tmp/__test_crypt.txt' },
                    { cmd: 'decrypt /tmp/__test_crypt.txt.enc testkey123' },
                    { cmd: 'cat /tmp/__test_crypt.txt', expect: (out) => out.includes('secret data xyz') },
                    { cmd: 'rm /tmp/__test_crypt.txt' },
                    { cmd: 'rm /tmp/__test_crypt.txt.enc' },
                ],
                destructive: true
            },

            // ── Skills ──
            'skill-list': {
                desc: 'skill-list returns skills',
                cmd: 'skill-list',
                expect: (out) => out.includes('Skills') || out.includes('No skills'),
                destructive: false
            },
            'skill-create-verify': {
                desc: 'skill create and view roundtrip',
                cmd_parts: [
                    { cmd: 'skill-create __test_dummy "Dummy test skill" testing test' },
                    { cmd: 'skill-view __test_dummy', expect: (out) => out.includes('__test_dummy') },
                    { cmd: 'skill-delete __test_dummy' },
                ],
                destructive: true
            },

            // ── Security ──
            'security-level-get': {
                desc: 'security-level returns current level',
                cmd: 'security-level',
                expect: (out) => out.length > 0,
                destructive: false
            },

            // ── Aliases ──
            'alias-list': {
                desc: 'alias shows built-in defaults',
                cmd: 'alias',
                expect: (out) => out.includes('ll=ls') && out.includes('h=help') && out.includes('cls=clear') && out.includes('sh=script'),
                destructive: false
            },
            'alias-show-specific': {
                desc: 'alias <name> shows a specific alias value',
                cmd: 'alias ll',
                expect: (out) => out.includes('ll=ls') && out.includes('built-in'),
                destructive: false
            },
            'alias-missing-unknown': {
                desc: 'alias <unknown> shows not found',
                cmd: 'alias non_existent_alias_xyz',
                expect: (out) => out.includes('not found'),
                destructive: false
            },
            'unalias-builtin-refused': {
                desc: 'unalias refuses to remove built-in alias',
                cmd: 'unalias ll',
                expect: (out) => out.includes('Cannot unalias built-in'),
                destructive: false
            },
            'alias-create-and-run': {
                desc: 'create custom alias and execute it',
                cmd_parts: [
                    { cmd: 'alias greet=echo hello from alias' },
                    { cmd: 'greet', expect: (out) => out.includes('hello from alias') },
                    { cmd: 'unalias greet' },
                ],
                destructive: true
            },
            'alias-overwrite': {
                desc: 'create, then overwrite, execute updated alias',
                cmd_parts: [
                    { cmd: 'alias greet2=echo first' },
                    { cmd: 'alias greet2=echo second' },
                    { cmd: 'greet2', expect: (out) => out.includes('second') },
                    { cmd: 'unalias greet2' },
                ],
                destructive: true
            },
            'unalias-custom': {
                desc: 'unalias removes a custom alias',
                cmd_parts: [
                    { cmd: 'alias tempcmd=echo temp' },
                    { cmd: 'unalias tempcmd' },
                    { cmd: 'alias tempcmd', expect: (out) => out.includes('not found') },
                ],
                destructive: true
            },

            // ── Modules ──
            'commands-help': {
                desc: 'help lists multiple command categories',
                cmd: 'help',
                expect: (out) => out.includes('commands') || out.includes('System') || out.includes('Filesystem'),
                destructive: false
            },
            'listmods': {
                desc: 'listmods shows loaded modules',
                cmd: 'listmods',
                expect: (out) => out.includes('Module') || out.includes('modules') || out.includes('loaded'),
                destructive: false
            },
        };
    }

    // ── Runner ──

    async _run(args) {
        const tests = this._tests();
        const names = Object.keys(tests);

        if (args.length > 0 && args[0] === 'list') {
            this.terminal.print('=== Available Tests ===', 'info');
            for (const name of names) {
                const t = tests[name];
                const tag = t.destructive ? '⚠️ destructive' : '✅ safe';
                this.terminal.print(`  ${name.padEnd(24)} ${t.desc}  [${tag}]`);
            }
            this.terminal.print(`\n${names.length} tests total`, 'info');
            return;
        }

        const filter = args.length > 0 ? args[0].toLowerCase() : null;
        const autoOnly = filter === 'auto';

        let selected = names;
        if (filter && filter !== 'auto' && filter !== 'all') {
            selected = names.filter(n => n.includes(filter));
            if (selected.length === 0) {
                this.terminal.print(`No tests matching "${filter}"`, 'error');
                return;
            }
        }

        const toRun = autoOnly ? selected.filter(n => !tests[n].destructive) : selected;
        const destructiveCount = toRun.filter(n => tests[n].destructive).length;

        // Save original security level
        const origLevel = localStorage.getItem('webx11_security_level') || '1';

        // Set to permissive for destructive tests
        this.terminal.security.setLevel(0);

        // Print header
        const divider = '─'.repeat(50);
        this.terminal.print(divider, 'info');
        this.terminal.print('  Test Suite — newOS4 ' + (window.NEWOS4_VERSION || 'v4.0'), 'info');
        this.terminal.print(divider, 'info');
        this.terminal.print(`  Running ${toRun.length} tests (${destructiveCount} destructive, ${toRun.length - destructiveCount} safe)`, 'info');
        this.terminal.print('', 'info');

        this._results = [];
        this._startTime = Date.now();
        let passed = 0, failed = 0, skipped = 0;

        for (const name of toRun) {
            const t = tests[name];
            const result = await this._runSingle(name, t);
            this._results.push(result);
            if (result.passed) {
                passed++;
                this.terminal.print(`  ✅ ${name} (${result.duration}s) — ${t.desc}`, 'success');
            } else if (result.skipped) {
                skipped++;
                this.terminal.print(`  ⏭ ${name} — ${result.reason}`, 'info');
            } else {
                failed++;
                this.terminal.print(`  ❌ ${name} (${result.duration}s) — ${t.desc}`, 'error');
                this.terminal.print(`     Expected: ${result.expected}`, 'warning');
                this.terminal.print(`     Got:      ${result.got}`, 'error');
            }
        }

        // Restore security level
        this.terminal.security.setLevel(parseInt(origLevel));

        // Summary
        const elapsed = ((Date.now() - this._startTime) / 1000).toFixed(1);
        this.terminal.print('', 'info');
        this.terminal.print(divider, 'info');
        const status = failed === 0 ? 'ALL PASSED ✅' : `${failed} FAILED ❌`;
        this.terminal.print(`  Result: ${passed}/${toRun.length} passed  ${failed} failed  ${skipped} skipped  (${elapsed}s)`, failed === 0 ? 'success' : 'error');

        if (failed > 0) {
            this.terminal.print('  Failures:', 'warning');
            for (const r of this._results) {
                if (!r.passed && !r.skipped) {
                    this.terminal.print(`    ${r.name} — ${r.desc}`, 'error');
                }
            }
        }
    }

    async _runSingle(name, t) {
        const start = Date.now();
        try {
            if (t.skip) {
                return { name, passed: false, skipped: true, reason: t.skip, duration: 0 };
            }

            // Multi-step test
            if (t.cmd_parts) {
                for (const part of t.cmd_parts) {
                    const captured = await this._capture(part.cmd);
                    if (part.expect) {
                        if (!part.expect(captured)) {
                            return {
                                name, passed: false, desc: t.desc,
                                expected: this._formatExpect(t),
                                got: captured.substring(0, 200),
                                duration: ((Date.now() - start) / 1000).toFixed(1)
                            };
                        }
                    }
                }
                return { name, passed: true, desc: t.desc, duration: ((Date.now() - start) / 1000).toFixed(1) };
            }

            // Single command test
            const output = await this._capture(t.cmd);
            if (t.expect && !t.expect(output)) {
                return {
                    name, passed: false, desc: t.desc,
                    expected: this._formatExpect(t),
                    got: output.substring(0, 200),
                    duration: ((Date.now() - start) / 1000).toFixed(1)
                };
            }
            return { name, passed: true, desc: t.desc, duration: ((Date.now() - start) / 1000).toFixed(1) };

        } catch (e) {
            return {
                name, passed: false, desc: t.desc,
                expected: this._formatExpect(t),
                got: `EXCEPTION: ${e.message}`,
                duration: ((Date.now() - start) / 1000).toFixed(1)
            };
        }
    }

    async _capture(cmdText) {
        const originalPrint = this.terminal.print.bind(this.terminal);
        let output = '';
        this.terminal.print = (text, type) => { output += text + '\n'; };

        await this.terminal.executeCommand(cmdText);

        this.terminal.print = originalPrint;
        return output;
    }

    _formatExpect(t) {
        if (t.expect && t.expect.toString) {
            const s = t.expect.toString();
            // Try to extract meaningful description from the function
            const match = s.match(/out\.includes\(['"]([^'"]+)['"]\)/);
            if (match) return `output includes "${match[1]}"`;
            if (s.includes('&&')) return 'all conditions met';
            if (s.includes('.length')) return 'non-empty output';
            return t.desc;
        }
        return 'no expectation';
    }
}