/**
 * API client for Model Inspector backend
 */

const API = {
    baseUrl: '',  // Same origin

    /**
     * Inspect a model by HuggingFace model ID
     * @param {string} modelId - HuggingFace model ID
     * @returns {Promise<{tree: Object, metadata: Object}>}
     */
    async inspectModel(modelId) {
        const response = await fetch(`${this.baseUrl}/api/inspect`, {
            method: 'POST',
            headers: {
                'Content-Type': 'application/json',
            },
            body: JSON.stringify({ model_id: modelId }),
        });

        if (!response.ok) {
            const error = await response.json();
            const detail = error.detail || 'Failed to inspect model';

            // Check for common auth/access errors
            const isAuthError = detail.includes('401') ||
                               detail.includes('403') ||
                               detail.includes('gated') ||
                               detail.includes('access') ||
                               detail.includes('token') ||
                               detail.includes('authorization') ||
                               detail.includes('authenticate');

            if (isAuthError) {
                const err = new Error(detail);
                err.isAuthError = true;
                throw err;
            }

            throw new Error(detail);
        }

        return response.json();
    },

    /**
     * Inspect a model by config object
     * @param {Object} config - Model config.json object
     * @returns {Promise<{tree: Object, metadata: Object}>}
     */
    async inspectConfig(config) {
        const response = await fetch(`${this.baseUrl}/api/inspect`, {
            method: 'POST',
            headers: {
                'Content-Type': 'application/json',
            },
            body: JSON.stringify({ config }),
        });

        if (!response.ok) {
            const error = await response.json();
            throw new Error(error.detail || 'Failed to inspect config');
        }

        return response.json();
    },

    /**
     * Upload a config.json file
     * @param {File} file - The config.json file
     * @returns {Promise<{tree: Object, metadata: Object}>}
     */
    async uploadConfig(file) {
        const formData = new FormData();
        formData.append('file', file);

        const response = await fetch(`${this.baseUrl}/api/upload`, {
            method: 'POST',
            body: formData,
        });

        if (!response.ok) {
            const error = await response.json();
            throw new Error(error.detail || 'Failed to upload config');
        }

        return response.json();
    },

    /**
     * Format parameter count for display
     * @param {number} count - Parameter count
     * @returns {string} Formatted string
     */
    formatParams(count) {
        if (count >= 1e12) {
            return `${(count / 1e12).toFixed(2)}T`;
        } else if (count >= 1e9) {
            return `${(count / 1e9).toFixed(2)}B`;
        } else if (count >= 1e6) {
            return `${(count / 1e6).toFixed(2)}M`;
        } else if (count >= 1e3) {
            return `${(count / 1e3).toFixed(2)}K`;
        }
        return count.toLocaleString();
    }
};