/**
 * API Helper for Physiotherapy Clinic Management System
 * Handles all API calls with centralized error handling
 */

class ApiClient {
    constructor() {
        this.baseUrl = '/api';
        this.token = document.querySelector('meta[name="api-token"]')?.content;
    }

    getHeaders() {
        const headers = {
            'Content-Type': 'application/json',
            'Accept': 'application/json',
            'X-CSRF-TOKEN': document.querySelector('meta[name="csrf-token"]')?.content
        };

        if (this.token) {
            headers['Authorization'] = `Bearer ${this.token}`;
        }

        return headers;
    }

    async request(url, options = {}) {
        const fullUrl = url.startsWith('http') ? url : `${this.baseUrl}${url}`;
        
        try {
            const response = await fetch(fullUrl, {
                ...options,
                headers: {
                    ...this.getHeaders(),
                    ...options.headers
                }
            });

            const data = await response.json();

            if (!response.ok) {
                this.handleError(data, response.status);
                throw new Error(data.message || 'Request failed');
            }

            return data;
        } catch (error) {
            console.error('API Error:', error);
            throw error;
        }
    }

    handleError(data, status) {
        let message = data.message || 'An error occurred';
        
        if (data.errors) {
            const errorMessages = Object.values(data.errors).flat();
            message = errorMessages.join('\n');
        }

        // Show AdminLTE toast
        $(document).Toasts('create', {
            class: status >= 500 ? 'bg-danger' : 'bg-warning',
            title: 'Error',
            body: message
        });
    }

    showSuccess(message) {
        $(document).Toasts('create', {
            class: 'bg-success',
            title: 'Success',
            body: message
        });
    }

    // Auth
    async login(credentials) {
        return this.request('/login', {
            method: 'POST',
            body: JSON.stringify(credentials)
        });
    }

    async logout() {
        return this.request('/logout', { method: 'POST' });
    }

    // Patients
    async getPatients(params = {}) {
        const query = new URLSearchParams(params).toString();
        return this.request(`/patients?${query}`);
    }

    async getPatient(id) {
        return this.request(`/patients/${id}`);
    }

    async createPatient(data) {
        return this.request('/patients', {
            method: 'POST',
            body: JSON.stringify(data)
        });
    }

    async updatePatient(id, data) {
        return this.request(`/patients/${id}`, {
            method: 'PUT',
            body: JSON.stringify(data)
        });
    }

    async deletePatient(id) {
        return this.request(`/patients/${id}`, { method: 'DELETE' });
    }

    // Appointments
    async getAppointments(params = {}) {
        const query = new URLSearchParams(params).toString();
        return this.request(`/appointments?${query}`);
    }

    async createAppointment(data) {
        return this.request('/appointments', {
            method: 'POST',
            body: JSON.stringify(data)
        });
    }

    async updateAppointment(id, data) {
        return this.request(`/appointments/${id}`, {
            method: 'PUT',
            body: JSON.stringify(data)
        });
    }

    async getAvailableSlots(therapistId, date, duration = 60) {
        return this.request(`/appointments/available-slots?therapist_id=${therapistId}&date=${date}&duration=${duration}`);
    }

    // Dashboard
    async getDashboard() {
        return this.request('/dashboard');
    }

    // Invoices
    async getInvoices(params = {}) {
        const query = new URLSearchParams(params).toString();
        return this.request(`/invoices?${query}`);
    }

    // Payments
    async createPayment(data) {
        return this.request('/payments', {
            method: 'POST',
            body: JSON.stringify(data)
        });
    }

    // Ledger
    async getLedgerSummary(startDate, endDate) {
        return this.request(`/ledger/summary/pl?date_from=${startDate}&date_to=${endDate}`);
    }
}

// Global instance
window.api = new ApiClient();