/**
 * @file Integration tests for security features
 * Tests CSP enforcement, network blocking, and clipboard behavior
 */

import { describe, test, expect, beforeEach } from 'bun:test';

// ============================================================================
// CSP ENFORCEMENT TESTS
// ============================================================================

describe('CSP Enforcement', () => {
    test('CSP headers are now managed by _headers file', () => {
        // This test is a placeholder to acknowledge that CSP is no longer in index.html.
        // True validation of headers requires an end-to-end test against a deployed environment,
        // which is beyond the scope of this unit test file. Manual verification is the next step.
        expect(true).toBe(true);
    });
});

// ============================================================================
// NETWORK BLOCKING TESTS
// ============================================================================

describe('Network Blocking', () => {
    let originalFetch: typeof fetch;

    beforeEach(() => {
        // Save originals
        originalFetch = globalThis.fetch;
    });

    test('should block fetch API after blockAllNetworks call', async () => {
        // Simulate blockAllNetworks behavior
        const mockBlockFetch = () => {
            (globalThis as any).fetch = (async () =>
                Promise.reject(new Error('Network blocked by user'))
            ) as any;
        };

        mockBlockFetch();

        // Attempt to fetch should reject
        try {
            await globalThis.fetch('https://example.com');
            expect.unreachable('Fetch should have been blocked');
        } catch (error) {
            expect(error instanceof Error).toBe(true);
            expect((error as Error).message).toContain('Network blocked');
        }
    });

    test('should block XMLHttpRequest after blockAllNetworks call', () => {
        // Simulate blockAllNetworks behavior - replace with error function
        const mockBlockXHR = () => {
            (globalThis as any).XMLHttpRequest = function () {
                throw new Error('Network blocked: XMLHttpRequest not allowed');
            };
        };

        mockBlockXHR();

        // Attempt to create XMLHttpRequest should throw
        expect(() => {
            new (globalThis as any).XMLHttpRequest();
        }).toThrow();
    });

    test('should allow network restoration after unblockAllNetworks', async () => {
        const mockBlockAndUnblock = () => {
            // Block
            (globalThis as any).__original_fetch = originalFetch;
            (globalThis as any).fetch = (async () =>
                Promise.reject(new Error('Network blocked by user'))
            ) as any;

            // Unblock
            if ((globalThis as any).__original_fetch) {
                globalThis.fetch = (globalThis as any).__original_fetch;
            }
        };

        mockBlockAndUnblock();

        // After unblocking, fetch function should be restored
        // (Note: actual network call might fail if no real network, but function should exist)
        expect(typeof globalThis.fetch).toBe('function');
    });

    test('should maintain network blocking state across multiple checks', async () => {
        const mockBlockFetch = () => {
            (globalThis as any).fetch = (async () =>
                Promise.reject(new Error('Network blocked by user'))
            ) as any;
        };

        mockBlockFetch();

        // First attempt blocked
        try {
            await globalThis.fetch('https://first-attempt.com');
            expect.unreachable();
        } catch (e) {
            expect((e as Error).message).toContain('Network blocked');
        }

        // Second attempt also blocked (state persists)
        try {
            await globalThis.fetch('https://second-attempt.com');
            expect.unreachable();
        } catch (e) {
            expect((e as Error).message).toContain('Network blocked');
        }
    });
});

// ============================================================================
// CLIPBOARD BEHAVIOR TESTS
// ============================================================================

describe('Clipboard Security', () => {
    test('should detect sensitive field names', () => {
        const sensitivePatterns = ['mnemonic', 'seed', 'password', 'private', 'key'];
        const fieldNames = [
            'mnemonic12Words',
            'seedValue',
            'backupPassword',
            'privateKeyInput',
            'encryptionKey'
        ];

        fieldNames.forEach((fieldName) => {
            const isSensitive = sensitivePatterns.some(pattern =>
                fieldName.toLowerCase().includes(pattern)
            );
            expect(isSensitive).toBe(true);
        });
    });

    test('should handle non-sensitive fields without warnings', () => {
        const sensitivePatterns = ['mnemonic', 'seed', 'password', 'private', 'key'];
        const fieldNames = [
            'publicKeyInput',
            'notes',
            'qrpayload'
        ];

        fieldNames.forEach((fieldName) => {
            const isSensitive = sensitivePatterns.some(pattern =>
                fieldName.toLowerCase().includes(pattern)
            );
            // Some of these might match 'key', so only test the ones that definitely shouldn't
            if (fieldName === 'publicKeyInput' || fieldName === 'notes') {
                expect(isSensitive).toBe(true === fieldName.includes('Key'));
            }
        });
    });

    test('should convert Uint8Array to hex for clipboard', () => {
        const testData = new Uint8Array([0xFF, 0x00, 0xAB, 0xCD]);
        const hexString = Array.from(testData)
            .map(b => b.toString(16).padStart(2, '0'))
            .join('');

        expect(hexString).toBe('ff00abcd');
    });

    test('should generate random garbage for clipboard clearing', () => {
        const length = 64;
        const garbage = crypto.getRandomValues(new Uint8Array(length))
            .reduce((s, b) => s + String.fromCharCode(32 + (b % 95)), '');

        expect(typeof garbage).toBe('string');
        expect(garbage.length).toBe(length);

        // Should be printable ASCII (no null bytes)
        garbage.split('').forEach(char => {
            const code = char.charCodeAt(0);
            expect(code >= 32 && code < 127).toBe(true);
        });
    });

    test('should track clipboard events with metadata', () => {
        interface ClipboardEvent {
            timestamp: Date;
            field: string;
            length: number;
        }

        const events: ClipboardEvent[] = [];

        // Simulate adding a clipboard event
        events.push({
            timestamp: new Date(),
            field: 'mnemonic (will clear in 10s)',
            length: 128
        });

        expect(events).toHaveLength(1);
        expect(events[0].field).toContain('mnemonic');
        expect(events[0].length).toBe(128);
        expect(events[0].timestamp).toBeDefined();
    });

    test('should maintain clipboard event history (max 10 entries)', () => {
        interface ClipboardEvent {
            timestamp: Date;
            field: string;
            length: number;
        }

        let events: ClipboardEvent[] = [];

        // Add 15 events
        for (let i = 0; i < 15; i++) {
            events = [
                {
                    timestamp: new Date(),
                    field: `field${i}`,
                    length: i * 10
                },
                ...events.slice(0, 9) // Keep max 10
            ];
        }

        expect(events).toHaveLength(10);
        expect(events[0].field).toBe('field14'); // Most recent first
        expect(events[9].field).toBe('field5'); // Oldest retained
    });
});

// ============================================================================
// SESSION KEY ROTATION TESTS
// ============================================================================

describe('Session Key Management', () => {
    test('should track key operation count for rotation', () => {
        let keyOperationCount = 0;
        const MAX_KEY_OPERATIONS = 1000;

        // Simulate operations
        for (let i = 0; i < 500; i++) {
            keyOperationCount++;
        }

        expect(keyOperationCount).toBe(500);
        expect(keyOperationCount < MAX_KEY_OPERATIONS).toBe(true);

        // Simulate more operations to trigger rotation
        for (let i = 0; i < 600; i++) {
            keyOperationCount++;
        }

        expect(keyOperationCount >= MAX_KEY_OPERATIONS).toBe(true);
    });

    test('should track key age for rotation', () => {
        const KEY_ROTATION_INTERVAL = 5 * 60 * 1000; // 5 minutes
        const keyCreatedAt = Date.now();

        // Simulate checking age
        const elapsed = Date.now() - keyCreatedAt;
        expect(elapsed < KEY_ROTATION_INTERVAL).toBe(true);
    });

    test('should handle key destruction on module level', () => {
        let sessionKey: CryptoKey | null = null;

        sessionKey = {} as CryptoKey; // Simulate key
        expect(sessionKey).toBeDefined();

        // Simulate destruction (nullify reference)
        sessionKey = null;
        expect(sessionKey).toBeNull();
    });
});

// ============================================================================
// ENCRYPTION/DECRYPTION TESTS
// ============================================================================

describe('Session Crypto Blob Format', () => {
    interface EncryptedBlob {
        v: 1;
        alg: 'A256GCM';
        iv_b64: string;
        ct_b64: string;
    }

    test('should have valid EncryptedBlob structure', () => {
        const blob: EncryptedBlob = {
            v: 1,
            alg: 'A256GCM',
            iv_b64: 'dGVzdGl2',
            ct_b64: 'dGVzdGNp'
        };

        expect(blob.v).toBe(1);
        expect(blob.alg).toBe('A256GCM');
        expect(typeof blob.iv_b64).toBe('string');
        expect(typeof blob.ct_b64).toBe('string');
    });

    test('should base64 encode/decode IV and ciphertext', () => {
        const originalText = 'test data';
        const encoded = btoa(originalText);
        const decoded = atob(encoded);

        expect(decoded).toBe(originalText);
    });

    test('should generate valid base64 for cryptographic values', () => {
        const iv = crypto.getRandomValues(new Uint8Array(12)); // 96-bit IV for GCM
        const ivBase64 = btoa(String.fromCharCode(...Array.from(iv)));

        // Base64 should be valid
        expect(typeof ivBase64).toBe('string');
        expect(ivBase64.length > 0).toBe(true);

        // Should be reversible
        const decoded = atob(ivBase64);
        expect(decoded.length).toBe(12);
    });
});
