/**
 * Parser performance tests
 * Tests regex pre-compilation and format caching optimizations
 */

// Test the pre-compiled regex patterns directly by importing them from parser.js
// We use dynamic import with mocking to avoid the SillyTavern dependency chain

describe('Parser regex pre-compilation', () => {
    // Test that pre-compiled regex patterns produce correct results
    // These patterns are now module-level constants in parser.js

    test('emoji regex pattern works correctly', () => {
        const EMOJI_RE = /^[\u{1F300}-\u{1F9FF}\u{2600}-\u{26FF}\u{2700}-\u{27BF}\u{1F000}-\u{1F02F}\u{1F0A0}-\u{1F0FF}\u{1F100}-\u{1F64F}\u{1F680}-\u{1F6FF}\u{1F910}-\u{1F96B}\u{1F980}-\u{1F9E0}\u{FE00}-\u{FE0F}\u{200D}\u{20E3}]+/u;
        expect('😊 Hello'.match(EMOJI_RE)).toBeTruthy();
        expect('Hello'.match(EMOJI_RE)).toBeNull();
    });

    test('thinking tag regex works correctly', () => {
        const THINKING_TAG_RE = /<think>[\s\S]*?<\/think>/gi;
        const THINKING_TAG_ALT_RE = /<thinking>[\s\S]*?<\/thinking>/gi;

        const text1 = '<think>thinking content</think>actual content';
        const text2 = '<thinking>thinking content</thinking>actual content';

        expect(text1.replace(THINKING_TAG_RE, '')).toBe('actual content');
        expect(text2.replace(THINKING_TAG_ALT_RE, '')).toBe('actual content');
    });

    test('JSON block regex works correctly', () => {
        const JSON_BLOCK_RE = /```json\s*\n([\s\S]*?)```/g;
        const text = '```json\n{"key": "value"}\n```';
        const matches = [...text.matchAll(JSON_BLOCK_RE)];
        expect(matches.length).toBe(1);
        expect(matches[0][1].trim()).toBe('{"key": "value"}');
    });

    test('code block regex works correctly', () => {
        const CODE_BLOCK_RE = /```([^`]+)```/g;
        const text = '```Stats\n---\nHealth: 100%\n```';
        const matches = [...text.matchAll(CODE_BLOCK_RE)];
        expect(matches.length).toBe(1);
        expect(matches[0][1].trim()).toBe('Stats\n---\nHealth: 100%');
    });

    test('XML trackers regex works correctly', () => {
        const XML_TRACKERS_RE = /<trackers>([\s\S]*?)<\/trackers>/i;
        const text = '<trackers>content here</trackers>';
        const match = text.match(XML_TRACKERS_RE);
        expect(match).toBeTruthy();
        expect(match[1]).toBe('content here');
    });

    test('stats section detection regex works', () => {
        const STATS_SECTION_RE = /Stats\s*\n\s*---/i;
        expect('Stats\n---\nHealth: 100%'.match(STATS_SECTION_RE)).toBeTruthy();
        expect('Info Box\n---\nDate: 2024'.match(STATS_SECTION_RE)).toBeNull();
    });

    test('info box section detection regex works', () => {
        const INFOBOX_SECTION_RE = /Info Box\s*\n\s*---/i;
        expect('Info Box\n---\nDate: 2024'.match(INFOBOX_SECTION_RE)).toBeTruthy();
        expect('Stats\n---\nHealth: 100%'.match(INFOBOX_SECTION_RE)).toBeNull();
    });

    test('characters section detection regex works', () => {
        const CHARACTERS_SECTION_RE = /Present Characters\s*\n\s*---/i;
        expect('Present Characters\n---\nAlice'.match(CHARACTERS_SECTION_RE)).toBeTruthy();
        expect('Stats\n---\nHealth: 100%'.match(CHARACTERS_SECTION_RE)).toBeNull();
    });

    test('RPG attribute regexes work', () => {
        const RPG_STR_RE = /STR:\s*(\d+)/i;
        const RPG_DEX_RE = /DEX:\s*(\d+)/i;
        const RPG_LVL_RE = /LVL:\s*(\d+)/i;

        expect('STR: 15'.match(RPG_STR_RE)?.[1]).toBe('15');
        expect('DEX: 20'.match(RPG_DEX_RE)?.[1]).toBe('20');
        expect('LVL: 10'.match(RPG_LVL_RE)?.[1]).toBe('10');
    });

    test('placeholder pattern regex works', () => {
        const PLACEHOLDER_PATTERN_RE = /\[([A-Za-z\s\/]+)\]/g;
        const text = '[Location] some text [Mood Emoji]';
        const matches = [...text.matchAll(PLACEHOLDER_PATTERN_RE)];
        expect(matches.length).toBe(2);
    });

    test('format marker regex works', () => {
        const FORMAT_MARKER_RE = /FORMAT:\s*/gi;
        expect('FORMAT: some text'.replace(FORMAT_MARKER_RE, '')).toBe('some text');
    });
});

describe('Format cache logic', () => {
    test('format cache hit threshold logic', () => {
        // Simulate the format caching logic from parser.js
        let lastDetectedFormat = null;
        let formatCacheHits = 0;
        const FORMAT_CACHE_HIT_THRESHOLD = 3;

        // Initially no cache
        expect(lastDetectedFormat).toBeNull();
        expect(formatCacheHits).toBe(0);

        // First detection
        lastDetectedFormat = 'json';
        formatCacheHits = 1;
        expect(formatCacheHits >= FORMAT_CACHE_HIT_THRESHOLD).toBe(false);

        // Second hit
        formatCacheHits++;
        expect(formatCacheHits >= FORMAT_CACHE_HIT_THRESHOLD).toBe(false);

        // Third hit - now cache is trusted
        formatCacheHits++;
        expect(formatCacheHits >= FORMAT_CACHE_HIT_THRESHOLD).toBe(true);

        // Cache clear
        lastDetectedFormat = null;
        formatCacheHits = 0;
        expect(lastDetectedFormat).toBeNull();
        expect(formatCacheHits).toBe(0);
    });
});

describe('Regex performance verification', () => {
    test('pre-compiled regex is faster than re-compiling', () => {
        // Pre-compiled constant (module-level)
        const PRECOMPILED_RE = /```json\s*\n([\s\S]*?)```/g;

        // Simulate per-call compilation (old behavior)
        const compilePerCall = (text) => {
            const re = /```json\s*\n([\s\S]*?)```/g;
            return [...text.matchAll(re)];
        };

        // Pre-compiled usage (new behavior)
        const usePrecompiled = (text) => {
            // Reset lastIndex for global regex
            PRECOMPILED_RE.lastIndex = 0;
            return [...text.matchAll(PRECOMPILED_RE)];
        };

        const testText = '```json\n{"key": "value"}\n```';

        // Both should produce the same result
        const compiled = compilePerCall(testText);
        const precompiled = usePrecompiled(testText);

        expect(compiled.length).toBe(precompiled.length);
        expect(compiled[0][1]).toBe(precompiled[0][1]);
    });
});