// API client for making requests to the backend
class ApiClient {
    constructor() {
        this.baseUrl = '';
        this.apiKey = '';
    }

    updateConfig() {
        this.baseUrl = config.getApiBaseUrl();
        this.apiKey = config.getApiKey();
    }

    getHeaders(includeContentType = true) {
        const headers = {
            'X-API-Key': this.apiKey
        };
        
        if (includeContentType) {
            headers['Content-Type'] = 'application/json';
        }
        
        return headers;
    }

    async makeRequest(method, endpoint, data = null, isFormData = false) {
        this.updateConfig();
        
        if (!this.baseUrl || !this.apiKey) {
            throw new Error('API not configured. Please set API base URL and key.');
        }

        const url = `${this.baseUrl}/api/v1${endpoint}`;
        
        const options = {
            method,
            headers: this.getHeaders(!isFormData)
        };

        if (data) {
            if (isFormData) {
                options.body = data; // FormData object
            } else {
                options.body = JSON.stringify(data);
            }
        }

        try {
            const response = await fetch(url, options);
            
            // Handle different response types
            if (response.status === 204) {
                return null; // No content
            }

            const contentType = response.headers.get('content-type');
            let responseData;

            if (contentType && contentType.includes('application/json')) {
                responseData = await response.json();
            } else {
                responseData = await response.text();
            }

            if (!response.ok) {
                const errorMessage = responseData?.detail || responseData?.message || `HTTP ${response.status}`;
                throw new Error(errorMessage);
            }

            return responseData;
        } catch (error) {
            console.error(`API request failed: ${method} ${url}`, error);
            throw error;
        }
    }

    // Teams API
    async getTeams() {
        return this.makeRequest('GET', '/teams');
    }

    async createTeam(teamData) {
        return this.makeRequest('POST', '/teams', teamData);
    }

    async updateTeam(teamId, teamData) {
        return this.makeRequest('PUT', `/teams/${teamId}`, teamData);
    }

    async deleteTeam(teamId) {
        return this.makeRequest('DELETE', `/teams/${teamId}`);
    }

    // Users API
    async getUsers() {
        return this.makeRequest('GET', '/users');
    }

    async createUser(userData) {
        return this.makeRequest('POST', '/users', userData);
    }

    async updateUser(userId, userData) {
        return this.makeRequest('PUT', `/users/${userId}`, userData);
    }

    async deleteUser(userId) {
        return this.makeRequest('DELETE', `/users/${userId}`);
    }

    // API Keys API
    async getApiKeys() {
        return this.makeRequest('GET', '/auth/api-keys');
    }

    async createApiKey(keyData) {
        return this.makeRequest('POST', '/auth/api-keys', keyData);
    }

    async deleteApiKey(keyId) {
        return this.makeRequest('DELETE', `/auth/api-keys/${keyId}`);
    }

    // Images API
    async getImages(page = 1, limit = 20, tags = null) {
        let endpoint = `/images?page=${page}&limit=${limit}`;
        if (tags) {
            endpoint += `&tags=${encodeURIComponent(tags)}`;
        }
        return this.makeRequest('GET', endpoint);
    }

    async getImage(imageId) {
        return this.makeRequest('GET', `/images/${imageId}`);
    }

    async uploadImage(formData) {
        return this.makeRequest('POST', '/images', formData, true);
    }

    async updateImage(imageId, imageData) {
        return this.makeRequest('PUT', `/images/${imageId}`, imageData);
    }

    async deleteImage(imageId) {
        return this.makeRequest('DELETE', `/images/${imageId}`);
    }

    // Search API
    async searchImages(query, similarityThreshold = 0.7, maxResults = 20, tags = null) {
        const searchData = {
            query,
            similarity_threshold: similarityThreshold,
            max_results: maxResults
        };
        
        if (tags) {
            searchData.tags = tags;
        }
        
        return this.makeRequest('POST', '/search', searchData);
    }

    // Bootstrap API
    async bootstrap(bootstrapData) {
        return this.makeRequest('POST', '/auth/bootstrap', bootstrapData);
    }

    // Health check
    async healthCheck() {
        this.updateConfig();
        const response = await fetch(`${this.baseUrl}/health`);
        return response.ok;
    }

    // Get image URL for display
    getImageUrl(imageId) {
        this.updateConfig();
        return `${this.baseUrl}/api/v1/images/${imageId}/file`;
    }

    // Get image thumbnail URL
    getThumbnailUrl(imageId, size = 'medium') {
        this.updateConfig();
        return `${this.baseUrl}/api/v1/images/${imageId}/thumbnail?size=${size}`;
    }
}

// Global API client instance
const apiClient = new ApiClient();

// Helper function to handle API errors consistently
function handleApiError(error, context = '') {
    console.error(`API Error ${context}:`, error);
    
    let message = error.message || 'An unknown error occurred';
    
    // Handle common error types
    if (message.includes('Failed to fetch') || message.includes('NetworkError')) {
        message = 'Unable to connect to the server. Please check your connection and API configuration.';
    } else if (message.includes('401')) {
        message = 'Authentication failed. Please check your API key.';
    } else if (message.includes('403')) {
        message = 'Access denied. You don\'t have permission to perform this action.';
    } else if (message.includes('404')) {
        message = 'The requested resource was not found.';
    } else if (message.includes('500')) {
        message = 'Server error. Please try again later.';
    }
    
    showAlert(message, 'danger');
    return message;
}