// static/admin/js/login.js

// Log levels: 0 = None, 1 = Error, 2 = Warning, 3 = Info, 4 = Debug
const LOG_LEVEL = 4; // Set to 4 for full debugging, 1 for errors only

const log = {
    error: (...args) => LOG_LEVEL >= 1 && console.error('❌ [ERROR]', ...args),
    warn: (...args) => LOG_LEVEL >= 2 && console.warn('⚠️ [WARN]', ...args),
    info: (...args) => LOG_LEVEL >= 3 && console.info('ℹ️ [INFO]', ...args),
    debug: (...args) => LOG_LEVEL >= 4 && console.log('🔍 [DEBUG]', ...args)
};

function adminLogin() {
    return {
        dark: false,
        credentials: {
            username: '',
            password: ''
        },
        loading: false,
        error: null,
        success: null,
        errors: {},

        init() {
            log.info('Login page initializing...');
            log.debug('Current pathname:', window.location.pathname);
            log.debug('Current URL:', window.location.href);

            // Just set theme - NO auth checking, NO token clearing!
            this.dark = localStorage.getItem('theme') === 'dark';
            log.debug('Dark mode:', this.dark);

            // DON'T clear tokens on init!
            // If user lands here with a valid token, they might be navigating manually
            // or got redirected. Let them try to login or navigate away.
            const token = localStorage.getItem('admin_token');
            if (token) {
                log.warn('Found existing token on login page');
                log.debug('Token preview:', token.substring(0, 20) + '...');
                log.info('Not clearing token - user may have navigated here manually');
            } else {
                log.debug('No existing token found');
            }

            log.info('Login page initialization complete');
        },

        clearTokens() {
            log.debug('Clearing all auth tokens...');
            const tokensBefore = {
                admin_token: !!localStorage.getItem('admin_token'),
                admin_user: !!localStorage.getItem('admin_user'),
                token: !!localStorage.getItem('token')
            };
            log.debug('Tokens before clear:', tokensBefore);

            localStorage.removeItem('admin_token');
            localStorage.removeItem('admin_user');
            localStorage.removeItem('token');

            const tokensAfter = {
                admin_token: !!localStorage.getItem('admin_token'),
                admin_user: !!localStorage.getItem('admin_user'),
                token: !!localStorage.getItem('token')
            };
            log.debug('Tokens after clear:', tokensAfter);
        },

        clearErrors() {
            log.debug('Clearing form errors');
            this.error = null;
            this.success = null;
            this.errors = {};
        },

        validateForm() {
            log.debug('Validating login form...');
            this.clearErrors();
            let isValid = true;

            if (!this.credentials.username.trim()) {
                this.errors.username = 'Username is required';
                log.warn('Validation failed: Username is required');
                isValid = false;
            }

            if (!this.credentials.password) {
                this.errors.password = 'Password is required';
                log.warn('Validation failed: Password is required');
                isValid = false;
            } else if (this.credentials.password.length < 6) {
                this.errors.password = 'Password must be at least 6 characters';
                log.warn('Validation failed: Password too short');
                isValid = false;
            }

            log.info('Form validation result:', isValid ? 'VALID' : 'INVALID');
            return isValid;
        },

        async handleLogin() {
            log.info('=== LOGIN ATTEMPT STARTED ===');

            if (!this.validateForm()) {
                log.warn('Form validation failed, aborting login');
                return;
            }

            this.loading = true;
            this.clearErrors();
            log.debug('Login state set to loading');

            try {
                log.info('Calling login API endpoint...');
                log.debug('Username:', this.credentials.username);
                log.debug('API endpoint: /api/v1/admin/auth/login');

                const startTime = Date.now();
                const response = await apiClient.post('/admin/auth/login', {
                    username: this.credentials.username.trim(),
                    password: this.credentials.password
                });
                const duration = Date.now() - startTime;

                log.info(`Login API response received in ${duration}ms`);
                log.debug('Response structure:', {
                    hasToken: !!response.access_token,
                    hasUser: !!response.user,
                    userRole: response.user?.role,
                    userName: response.user?.username
                });

                // Validate response
                if (!response.access_token) {
                    log.error('Invalid response: No access token');
                    throw new Error('Invalid response from server - no token');
                }

                if (response.user && response.user.role !== 'admin') {
                    log.error('Authorization failed: User is not admin', {
                        actualRole: response.user.role
                    });
                    throw new Error('Access denied. Admin privileges required.');
                }

                log.info('Login successful, storing authentication data...');

                // Store authentication data
                localStorage.setItem('admin_token', response.access_token);
                localStorage.setItem('token', response.access_token);
                log.debug('Token stored, length:', response.access_token.length);

                if (response.user) {
                    localStorage.setItem('admin_user', JSON.stringify(response.user));
                    log.debug('User data stored:', {
                        username: response.user.username,
                        role: response.user.role,
                        id: response.user.id
                    });
                }

                // Verify storage
                const storedToken = localStorage.getItem('admin_token');
                const storedUser = localStorage.getItem('admin_user');
                log.info('Storage verification:', {
                    tokenStored: !!storedToken,
                    userStored: !!storedUser,
                    tokenLength: storedToken?.length
                });

                // Show success message
                this.success = 'Login successful! Redirecting...';
                log.info('Success message displayed to user');

                log.info('Redirecting to dashboard immediately...');
                log.info('=== EXECUTING REDIRECT ===');
                log.debug('Target URL: /admin/dashboard');
                log.debug('Redirect method: window.location.href');

                // Use href instead of replace to allow back button
                // But redirect IMMEDIATELY - don't wait!
                window.location.href = '/admin/dashboard';

            } catch (error) {
                log.error('Login failed:', error);
                log.error('Error details:', {
                    message: error.message,
                    name: error.name,
                    stack: error.stack
                });

                this.error = error.message || 'Invalid username or password. Please try again.';
                log.info('Error message displayed to user:', this.error);

                // Only clear tokens on login FAILURE
                this.clearTokens();
                log.info('Tokens cleared after error');

            } finally {
                this.loading = false;
                log.debug('Login state set to not loading');
                log.info('=== LOGIN ATTEMPT FINISHED ===');
            }
        },

        toggleDarkMode() {
            log.debug('Toggling dark mode...');
            this.dark = !this.dark;
            localStorage.setItem('theme', this.dark ? 'dark' : 'light');
            log.info('Dark mode:', this.dark ? 'ON' : 'OFF');
        }
    }
}