/**
 * CVS Proxy API Client
 * Handles all API calls to the backend
 */

class CVSProxyAPI {
    constructor(baseURL = '') {
        this.baseURL = baseURL || '';
    }

    /**
     * Make a fetch request to the API
     * @param {string} endpoint - API endpoint
     * @param {object} options - Fetch options
     * @returns {Promise} Response data
     */
    async request(endpoint, options = {}) {
        const url = `${this.baseURL}/api/v1${endpoint}`;
        
        try {
            const response = await fetch(url, {
                headers: {
                    'Content-Type': 'application/json',
                    ...options.headers,
                },
                ...options,
            });

            if (!response.ok) {
                const error = await response.json().catch(() => ({}));
                throw new Error(error.error || `HTTP ${response.status}`);
            }

            // Handle different content types
            const contentType = response.headers.get('content-type');
            if (contentType && contentType.includes('application/json')) {
                return await response.json();
            } else {
                return await response.text();
            }
        } catch (error) {
            console.error('API Error:', error);
            throw error;
        }
    }

    /**
     * Get repository tree structure
     * @param {string} module - Optional module to list
     * @returns {Promise<Array>} List of files and directories
     */
    async getTree(module = null) {
        const params = new URLSearchParams();
        if (module) {
            params.append('module', module);
        }
        const query = params.toString() ? `?${params.toString()}` : '';
        return this.request(`/tree${query}`);
    }

    /**
     * Get file content
     * @param {string} filePath - Path to the file
     * @param {string} revision - Optional specific revision
     * @returns {Promise<string>} File content
     */
    async getFileContent(filePath, revision = null) {
        const params = new URLSearchParams();
        params.append('file', filePath);
        if (revision) {
            params.append('revision', revision);
        }
        return this.request(`/file?${params.toString()}`);
    }

    /**
     * Get file revision history
     * @param {string} filePath - Path to the file
     * @returns {Promise<Array>} Array of revision objects
     */
    async getFileHistory(filePath) {
        const params = new URLSearchParams();
        params.append('file', filePath);
        return this.request(`/history?${params.toString()}`);
    }

    /**
     * Get diff between two revisions
     * @param {string} filePath - Path to the file
     * @param {string} rev1 - First revision
     * @param {string} rev2 - Second revision
     * @returns {Promise<object>} Diff object with diff property
     */
    async getDiff(filePath, rev1, rev2) {
        const params = new URLSearchParams();
        params.append('file', filePath);
        params.append('rev1', rev1);
        params.append('rev2', rev2);
        return this.request(`/diff?${params.toString()}`);
    }

    /**
     * Check API health
     * @returns {Promise<object>} Health status
     */
    async getHealth() {
        return this.request('/health');
    }
}

// Create global API instance with basepath from config
const api = new CVSProxyAPI(window.APP_CONFIG?.basepath || '');