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/**
 * API Client Module
 * Handles all API communication with authentication
 */
export class ApiClient {
    constructor(authManager) {
        this.authManager = authManager;
    }

    async authenticatedFetch(url, options = {}) {
        const headers = {
            ...this.authManager.getAuthHeaders(),
            ...options.headers
        };
        
        const response = await fetch(url, {
            ...options,
            headers
        });
        
        if (response.status === 401) {
            // Token expired or invalid
            this.authManager.clearAuthData();
            window.location.href = '/login';
            return null;
        }
        
        return response;
    }

    async loadFormOptions() {
        try {
            const [utilityResponse, phenologyResponse, categoriesResponse] = await Promise.all([
                this.authenticatedFetch('/api/utilities'),
                this.authenticatedFetch('/api/phenology-stages'),
                this.authenticatedFetch('/api/photo-categories')
            ]);

            if (!utilityResponse || !phenologyResponse || !categoriesResponse) {
                throw new Error('Failed to load form options');
            }

            const [utilityData, phenologyData, categoriesData] = await Promise.all([
                utilityResponse.json(),
                phenologyResponse.json(),
                categoriesResponse.json()
            ]);

            return {
                utilities: utilityData.utilities,
                phenologyStages: phenologyData.stages,
                photoCategories: categoriesData.categories
            };
        } catch (error) {
            console.error('Error loading form options:', error);
            throw error;
        }
    }

    async saveTree(treeData) {
        const response = await this.authenticatedFetch('/api/trees', {
            method: 'POST',
            headers: {
                'Content-Type': 'application/json'
            },
            body: JSON.stringify(treeData)
        });
        
        if (!response) return null;
        
        if (!response.ok) {
            const error = await response.json();
            throw new Error(error.detail || 'Unknown error');
        }
        
        return await response.json();
    }

    async updateTree(treeId, treeData) {
        const response = await this.authenticatedFetch(`/api/trees/${treeId}`, {
            method: 'PUT',
            headers: {
                'Content-Type': 'application/json'
            },
            body: JSON.stringify(treeData)
        });
        
        if (!response) return null;
        
        if (!response.ok) {
            const error = await response.json();
            throw new Error(error.detail || 'Unknown error');
        }
        
        return await response.json();
    }

    async deleteTree(treeId) {
        const response = await this.authenticatedFetch(`/api/trees/${treeId}`, {
            method: 'DELETE'
        });
        
        if (!response) return null;
        
        if (!response.ok) {
            const error = await response.json();
            throw new Error(error.detail || 'Unknown error');
        }
        
        return true;
    }

    async loadTrees(limit = 20) {
        const response = await this.authenticatedFetch(`/api/trees?limit=${limit}`);
        if (!response) return [];
        
        if (!response.ok) {
            throw new Error('Failed to load trees');
        }
        
        return await response.json();
    }

    async loadTree(treeId) {
        const response = await this.authenticatedFetch(`/api/trees/${treeId}`);
        if (!response) return null;
        
        if (!response.ok) {
            throw new Error('Failed to fetch tree data');
        }
        
        return await response.json();
    }

    async loadTreeCodes() {
        const response = await this.authenticatedFetch('/api/tree-codes');
        if (!response) return [];
        
        if (!response.ok) {
            throw new Error('Failed to load tree codes');
        }
        
        const data = await response.json();
        return data.tree_codes || [];
    }

    async searchTreeSuggestions(query, limit = 10) {
        const response = await this.authenticatedFetch(
            `/api/tree-suggestions?query=${encodeURIComponent(query)}&limit=${limit}`
        );
        
        if (!response) return [];
        
        if (!response.ok) {
            throw new Error('Failed to search tree suggestions');
        }
        
        const data = await response.json();
        return data.suggestions || [];
    }

    async uploadFile(file, type, category = null) {
        const formData = new FormData();
        formData.append('file', file);
        if (category) {
            formData.append('category', category);
        }
        
        const endpoint = type === 'image' ? '/api/upload/image' : '/api/upload/audio';
        let resJson = null;
        try {
            const response = await fetch(endpoint, {
                method: 'POST',
                headers: {
                    'Authorization': `Bearer ${this.authManager.authToken}`
                },
                body: formData
            });
            
            if (!response.ok) {
                // Avoid noisy telemetry; just throw error
                throw new Error('Upload failed');
            }
            resJson = await response.json();
            return resJson;
        } catch (e) {
            // Network or other errors
            throw e;
        }
    }

}