/**
 * E2E Tests for Chat Message Flow
 * Tests sending messages and research integration
 *
 * Prerequisites: Web server running on http://127.0.0.1:5000
 */

const puppeteer = require('puppeteer');
const AuthHelper = require('../auth_helper');
const { getPuppeteerLaunchOptions } = require('../puppeteer_config');
const fs = require('fs');
const path = require('path');

const BASE_URL = process.env.BASE_URL || 'http://127.0.0.1:5000';
const isCI = !!process.env.CI;

// Timeouts adjusted for CI environment
const TIMEOUTS = {
    navigation: isCI ? 60000 : 30000,
    selector: isCI ? 30000 : 10000,
    element: isCI ? 10000 : 5000,
};

async function testChatMessageFlow() {
    console.log(`🧪 Running chat message flow test (CI mode: ${isCI})`);

    // Create screenshots directory if it doesn't exist
    const screenshotsDir = path.join(__dirname, '..', 'screenshots');
    if (!fs.existsSync(screenshotsDir)) {
        fs.mkdirSync(screenshotsDir, { recursive: true });
    }

    const browser = await puppeteer.launch(getPuppeteerLaunchOptions());
    const page = await browser.newPage();

    // Set viewport
    await page.setViewport({ width: 1280, height: 800 });

    // Set timeouts
    if (isCI) {
        page.setDefaultTimeout(60000);
        page.setDefaultNavigationTimeout(60000);
    }

    // Enable console logging for debugging
    page.on('console', msg => {
        if (msg.type() === 'error') {
            console.log(`BROWSER ERROR: ${msg.text()}`);
        }
    });

    page.on('pageerror', error => {
        console.log('PAGE ERROR:', error.message);
    });

    const authHelper = new AuthHelper(page, BASE_URL);

    let testsPassed = 0;
    let testsFailed = 0;

    try {
        // Ensure we're logged in
        console.log('🔐 Ensuring authentication...');
        await authHelper.ensureAuthenticated();
        console.log('✅ Authentication verified\n');

        // Navigate to chat page to get CSRF token
        await page.goto(`${BASE_URL}/chat/`, {
            waitUntil: 'domcontentloaded',
            timeout: TIMEOUTS.navigation
        });

        await page.waitForSelector('.ldr-chat-container', {
            timeout: TIMEOUTS.selector
        });

        // Get CSRF token from the page
        const csrfToken = await page.evaluate(() => {
            const meta = document.querySelector('meta[name="csrf-token"]');
            if (meta) return meta.content;
            const input = document.querySelector('input[name="csrf_token"]');
            if (input) return input.value;
            return null;
        });

        if (!csrfToken) {
            console.log('⚠️  Warning: CSRF token not found, tests may fail');
        } else {
            console.log('✅ CSRF token obtained\n');
        }

        // Test 1: Send message via API
        console.log('📋 Test 1: Send message via API');
        try {
            // Create a session first
            const sessionResponse = await page.evaluate(async (token) => {
                const response = await fetch('/api/chat/sessions', {
                    method: 'POST',
                    headers: {
                        'Content-Type': 'application/json',
                        'X-CSRFToken': token || ''
                    },
                    credentials: 'same-origin',
                    body: JSON.stringify({ initial_query: 'Message flow test' })
                });
                return response.json();
            }, csrfToken);

            if (!sessionResponse.success) {
                throw new Error('Failed to create session');
            }

            const sessionId = sessionResponse.session_id;

            // Send a message without triggering research (faster test)
            const messageResponse = await page.evaluate(async (sid, token) => {
                const response = await fetch(`/api/chat/sessions/${sid}/messages`, {
                    method: 'POST',
                    headers: {
                        'Content-Type': 'application/json',
                        'X-CSRFToken': token || ''
                    },
                    credentials: 'same-origin',
                    body: JSON.stringify({
                        content: 'Hello, this is a test message',
                        trigger_research: false
                    })
                });
                return response.json();
            }, sessionId, csrfToken);

            if (!messageResponse.success || !messageResponse.message_id) {
                throw new Error(`Failed to send message: ${JSON.stringify(messageResponse)}`);
            }

            console.log(`   Message sent: ${messageResponse.message_id.substring(0, 8)}...`);
            console.log('✅ Test 1 PASSED: Message sent via API\n');
            testsPassed++;
        } catch (error) {
            console.log(`❌ Test 1 FAILED: ${error.message}\n`);
            await page.screenshot({ path: path.join(screenshotsDir, 'chat_message_send_failed.png') });
            testsFailed++;
        }

        // Test 2: Get messages for session
        console.log('📋 Test 2: Get messages for session');
        try {
            // Create session and send message
            const sessionResponse = await page.evaluate(async (token) => {
                const response = await fetch('/api/chat/sessions', {
                    method: 'POST',
                    headers: {
                        'Content-Type': 'application/json',
                        'X-CSRFToken': token || ''
                    },
                    credentials: 'same-origin',
                    body: JSON.stringify({ initial_query: 'Get messages test' })
                });
                return response.json();
            }, csrfToken);

            const sessionId = sessionResponse.session_id;

            // Send a message
            await page.evaluate(async (sid, token) => {
                await fetch(`/api/chat/sessions/${sid}/messages`, {
                    method: 'POST',
                    headers: {
                        'Content-Type': 'application/json',
                        'X-CSRFToken': token || ''
                    },
                    credentials: 'same-origin',
                    body: JSON.stringify({
                        content: 'Test message for retrieval',
                        trigger_research: false
                    })
                });
            }, sessionId, csrfToken);

            // Get messages
            const messagesResponse = await page.evaluate(async (sid) => {
                const response = await fetch(`/api/chat/sessions/${sid}/messages`);
                return response.json();
            }, sessionId);

            if (!messagesResponse.success) {
                throw new Error('Failed to get messages');
            }

            if (messagesResponse.messages.length === 0) {
                throw new Error('No messages returned');
            }

            console.log(`   Retrieved ${messagesResponse.messages.length} message(s)`);
            console.log('✅ Test 2 PASSED: Messages retrieved\n');
            testsPassed++;
        } catch (error) {
            console.log(`❌ Test 2 FAILED: ${error.message}\n`);
            await page.screenshot({ path: path.join(screenshotsDir, 'chat_get_messages_failed.png') });
            testsFailed++;
        }

        // Test 3: Message triggers research (with trigger_research=true)
        console.log('📋 Test 3: Message triggers research');
        try {
            // Create session
            const sessionResponse = await page.evaluate(async (token) => {
                const response = await fetch('/api/chat/sessions', {
                    method: 'POST',
                    headers: {
                        'Content-Type': 'application/json',
                        'X-CSRFToken': token || ''
                    },
                    credentials: 'same-origin',
                    body: JSON.stringify({ initial_query: 'Research trigger test' })
                });
                return response.json();
            }, csrfToken);

            const sessionId = sessionResponse.session_id;

            // Send a message with research trigger
            const messageResponse = await page.evaluate(async (sid, token) => {
                const response = await fetch(`/api/chat/sessions/${sid}/messages`, {
                    method: 'POST',
                    headers: {
                        'Content-Type': 'application/json',
                        'X-CSRFToken': token || ''
                    },
                    credentials: 'same-origin',
                    body: JSON.stringify({
                        content: 'What is quantum computing?',
                        trigger_research: true
                    })
                });
                return response.json();
            }, sessionId, csrfToken);

            if (!messageResponse.success) {
                throw new Error(`Failed to send message: ${JSON.stringify(messageResponse)}`);
            }

            // When trigger_research is true, research_id should be returned
            if (!messageResponse.research_id) {
                throw new Error('No research_id returned');
            }

            console.log(`   Research triggered: ${messageResponse.research_id.substring(0, 8)}...`);
            console.log(`   Research mode: ${messageResponse.research_mode}`);
            console.log('✅ Test 3 PASSED: Research triggered\n');
            testsPassed++;
        } catch (error) {
            console.log(`❌ Test 3 FAILED: ${error.message}\n`);
            await page.screenshot({ path: path.join(screenshotsDir, 'chat_research_trigger_failed.png') });
            testsFailed++;
        }

        // Test 4: Multiple messages maintain sequence order
        console.log('📋 Test 4: Multiple messages maintain sequence order');
        try {
            // Create session
            const sessionResponse = await page.evaluate(async (token) => {
                const response = await fetch('/api/chat/sessions', {
                    method: 'POST',
                    headers: {
                        'Content-Type': 'application/json',
                        'X-CSRFToken': token || ''
                    },
                    credentials: 'same-origin',
                    body: JSON.stringify({ initial_query: 'Sequence test' })
                });
                return response.json();
            }, csrfToken);

            const sessionId = sessionResponse.session_id;

            // Send multiple messages
            for (let i = 1; i <= 5; i++) {
                await page.evaluate(async (sid, content, token) => {
                    await fetch(`/api/chat/sessions/${sid}/messages`, {
                        method: 'POST',
                        headers: {
                            'Content-Type': 'application/json',
                            'X-CSRFToken': token || ''
                        },
                        credentials: 'same-origin',
                        body: JSON.stringify({
                            content,
                            trigger_research: false
                        })
                    });
                }, sessionId, `Message number ${i}`, csrfToken);
            }

            // Get messages and verify sequence
            const messagesResponse = await page.evaluate(async (sid) => {
                const response = await fetch(`/api/chat/sessions/${sid}/messages`);
                return response.json();
            }, sessionId);

            if (messagesResponse.messages.length !== 5) {
                throw new Error(`Expected 5 messages, got ${messagesResponse.messages.length}`);
            }

            // Verify sequence numbers are in order
            for (let i = 0; i < messagesResponse.messages.length; i++) {
                const expectedSeq = i + 1;
                const actualSeq = messagesResponse.messages[i].sequence_number;
                if (actualSeq !== expectedSeq) {
                    throw new Error(`Sequence mismatch at index ${i}: expected ${expectedSeq}, got ${actualSeq}`);
                }
            }

            console.log('   5 messages with correct sequence numbers');
            console.log('✅ Test 4 PASSED: Message sequence maintained\n');
            testsPassed++;
        } catch (error) {
            console.log(`❌ Test 4 FAILED: ${error.message}\n`);
            await page.screenshot({ path: path.join(screenshotsDir, 'chat_sequence_failed.png') });
            testsFailed++;
        }

        // Test 5: Message with special characters
        console.log('📋 Test 5: Message with special characters');
        try {
            // Create session
            const sessionResponse = await page.evaluate(async (token) => {
                const response = await fetch('/api/chat/sessions', {
                    method: 'POST',
                    headers: {
                        'Content-Type': 'application/json',
                        'X-CSRFToken': token || ''
                    },
                    credentials: 'same-origin',
                    body: JSON.stringify({ initial_query: 'Special chars test' })
                });
                return response.json();
            }, csrfToken);

            const sessionId = sessionResponse.session_id;
            const specialContent = 'Message with <script>alert(1)</script> and "quotes" & émojis 🎉';

            // Send message with special characters
            const messageResponse = await page.evaluate(async (sid, content, token) => {
                const response = await fetch(`/api/chat/sessions/${sid}/messages`, {
                    method: 'POST',
                    headers: {
                        'Content-Type': 'application/json',
                        'X-CSRFToken': token || ''
                    },
                    credentials: 'same-origin',
                    body: JSON.stringify({
                        content,
                        trigger_research: false
                    })
                });
                return response.json();
            }, sessionId, specialContent, csrfToken);

            if (!messageResponse.success) {
                throw new Error('Failed to send message with special characters');
            }

            // Retrieve and verify content is preserved
            const messagesResponse = await page.evaluate(async (sid) => {
                const response = await fetch(`/api/chat/sessions/${sid}/messages`);
                return response.json();
            }, sessionId);

            const lastMessage = messagesResponse.messages[messagesResponse.messages.length - 1];
            if (lastMessage.content !== specialContent) {
                throw new Error('Message content not preserved correctly');
            }

            console.log('   Special characters preserved in message');
            console.log('✅ Test 5 PASSED: Special characters handled\n');
            testsPassed++;
        } catch (error) {
            console.log(`❌ Test 5 FAILED: ${error.message}\n`);
            await page.screenshot({ path: path.join(screenshotsDir, 'chat_special_chars_failed.png') });
            testsFailed++;
        }

        // Test 6: Empty message rejected
        console.log('📋 Test 6: Empty message rejected');
        try {
            // Create session
            const sessionResponse = await page.evaluate(async (token) => {
                const response = await fetch('/api/chat/sessions', {
                    method: 'POST',
                    headers: {
                        'Content-Type': 'application/json',
                        'X-CSRFToken': token || ''
                    },
                    credentials: 'same-origin',
                    body: JSON.stringify({ initial_query: 'Empty message test' })
                });
                return response.json();
            }, csrfToken);

            const sessionId = sessionResponse.session_id;

            // Try to send empty message
            const messageResponse = await page.evaluate(async (sid, token) => {
                const response = await fetch(`/api/chat/sessions/${sid}/messages`, {
                    method: 'POST',
                    headers: {
                        'Content-Type': 'application/json',
                        'X-CSRFToken': token || ''
                    },
                    credentials: 'same-origin',
                    body: JSON.stringify({
                        content: '',
                        trigger_research: false
                    })
                });
                return { status: response.status, data: await response.json() };
            }, sessionId, csrfToken);

            if (messageResponse.status !== 400) {
                throw new Error(`Expected 400 for empty message, got ${messageResponse.status}`);
            }

            console.log('   Empty message correctly rejected with 400');
            console.log('✅ Test 6 PASSED: Empty message validation works\n');
            testsPassed++;
        } catch (error) {
            console.log(`❌ Test 6 FAILED: ${error.message}\n`);
            await page.screenshot({ path: path.join(screenshotsDir, 'chat_empty_message_failed.png') });
            testsFailed++;
        }

        // Test 7: Message to nonexistent session returns 404
        console.log('📋 Test 7: Message to nonexistent session');
        try {
            const fakeSessionId = 'nonexistent-session-id-12345';

            const messageResponse = await page.evaluate(async (sid, token) => {
                const response = await fetch(`/api/chat/sessions/${sid}/messages`, {
                    method: 'POST',
                    headers: {
                        'Content-Type': 'application/json',
                        'X-CSRFToken': token || ''
                    },
                    credentials: 'same-origin',
                    body: JSON.stringify({
                        content: 'Test message',
                        trigger_research: false
                    })
                });
                return { status: response.status, data: await response.json() };
            }, fakeSessionId, csrfToken);

            if (messageResponse.status !== 404) {
                throw new Error(`Expected 404 for nonexistent session, got ${messageResponse.status}`);
            }

            console.log('   Nonexistent session correctly returns 404');
            console.log('✅ Test 7 PASSED: 404 for nonexistent session\n');
            testsPassed++;
        } catch (error) {
            console.log(`❌ Test 7 FAILED: ${error.message}\n`);
            await page.screenshot({ path: path.join(screenshotsDir, 'chat_404_failed.png') });
            testsFailed++;
        }

    } catch (error) {
        console.log(`💥 Test suite error: ${error.message}`);
        testsFailed++;
    } finally {
        await browser.close();
    }

    // Print summary
    console.log('─'.repeat(50));
    console.log(`📊 Chat Message Flow Tests Summary`);
    console.log(`   ✅ Passed: ${testsPassed}`);
    console.log(`   ❌ Failed: ${testsFailed}`);
    console.log('─'.repeat(50));

    if (testsFailed > 0) {
        process.exit(1);
    }
}

testChatMessageFlow().catch(error => {
    console.error('💥 Test runner error:', error);
    process.exit(1);
});