import {
    MedPaciente,
    MedProfissional,
    MedAgendamento,
    MedProntuario,
    MedFinanceiro,
    MedNotificacao
} from '../types.ts';

const API_BASE_URL = '/api/med'; // New namespace for medical API

export class MedicoBackend {
    // --- STORAGE KEYS ---
    private static KEYS = {
        PACIENTES: 'med_pacientes',
        PROFISSIONAIS: 'med_profissionais',
        AGENDAMENTOS: 'med_agendamentos',
        PRONTUARIOS: 'med_prontuarios',
        FINANCEIRO: 'med_financeiro',
        NOTIFICACOES: 'med_notificacoes',
        AUTH: 'med_auth_token'
    };

    // --- HELPERS ---
    private static async request<T>(path: string, options: RequestInit = {}): Promise<T> {
        const token = localStorage.getItem(this.KEYS.AUTH);
        const headers = {
            'Content-Type': 'application/json',
            ...(token ? { 'Authorization': `Bearer ${token}` } : {}),
            ...options.headers,
        };

        try {
            const response = await fetch(`${API_BASE_URL}${path}`, { ...options, headers });
            if (!response.ok) throw new Error(`API Error: ${response.statusText}`);
            return await response.json();
        } catch (err) {
            console.warn(`API unavailable at ${path}, falling back to local storage.`, err);
            throw err; // Let the caller decide how to handle fallback
        }
    }

    // --- PACIENTES ---
    static async getPacientes(): Promise<MedPaciente[]> {
        try {
            return await this.request<MedPaciente[]>('/pacientes');
        } catch {
            const stored = localStorage.getItem(this.KEYS.PACIENTES);
            return stored ? JSON.parse(stored) : [];
        }
    }

    static async savePaciente(paciente: MedPaciente): Promise<void> {
        try {
            await this.request('/pacientes', {
                method: 'POST',
                body: JSON.stringify(paciente)
            });
        } catch {
            const pacientes = await this.getPacientes();
            const index = pacientes.findIndex(p => p.id === paciente.id);
            if (index >= 0) pacientes[index] = paciente;
            else pacientes.push(paciente);
            localStorage.setItem(this.KEYS.PACIENTES, JSON.stringify(pacientes));
        }
    }

    // --- AGENDA / PROFISSIONAIS ---
    static async getProfissionais(): Promise<MedProfissional[]> {
        try {
            return await this.request<MedProfissional[]>('/profissionais');
        } catch {
            const stored = localStorage.getItem(this.KEYS.PROFISSIONAIS);
            if (stored) return JSON.parse(stored);
            // Mock initial data if empty
            const mock: MedProfissional[] = [
                { id: '1', nome: 'Dr. Ricardo Santos', crm: '12345-MS', especialidade: 'Cardiologia', email: 'ricardo@med.com', telefone: '67 9999-9999', ativo: true, corAgenda: '#22d3ee' },
                { id: '2', nome: 'Dra. Ana Oliveira', crm: '67890-MS', especialidade: 'Pediatria', email: 'ana@med.com', telefone: '67 8888-8888', ativo: true, corAgenda: '#f43f5e' }
            ];
            localStorage.setItem(this.KEYS.PROFISSIONAIS, JSON.stringify(mock));
            return mock;
        }
    }

    static async getAgendamentos(): Promise<MedAgendamento[]> {
        try {
            return await this.request<MedAgendamento[]>('/agendamentos');
        } catch {
            const stored = localStorage.getItem(this.KEYS.AGENDAMENTOS);
            return stored ? JSON.parse(stored) : [];
        }
    }

    static async saveAgendamento(agenda: MedAgendamento): Promise<void> {
        try {
            await this.request('/agendamentos', {
                method: 'POST',
                body: JSON.stringify(agenda)
            });
        } catch {
            const data = await this.getAgendamentos();
            const index = data.findIndex(a => a.id === agenda.id);
            if (index >= 0) data[index] = agenda;
            else data.push(agenda);
            localStorage.setItem(this.KEYS.AGENDAMENTOS, JSON.stringify(data));
        }
    }

    // --- FINANCEIRO ---
    static async getFinanceiro(): Promise<MedFinanceiro[]> {
        try {
            return await this.request<MedFinanceiro[]>('/financeiro');
        } catch {
            const stored = localStorage.getItem(this.KEYS.FINANCEIRO);
            return stored ? JSON.parse(stored) : [];
        }
    }

    // --- NOTIFICACOES ---
    static async getNotificacoes(): Promise<MedNotificacao[]> {
        try {
            return await this.request<MedNotificacao[]>('/notificacoes');
        } catch {
            const stored = localStorage.getItem(this.KEYS.NOTIFICACOES);
            return stored ? JSON.parse(stored) : [];
        }
    }

    static async markNotificationRead(id: string): Promise<void> {
        try {
            await this.request(`/notificacoes/${id}/read`, { method: 'PUT' });
        } catch {
            const notifs = await this.getNotificacoes();
            const index = notifs.findIndex(n => n.id === id);
            if (index >= 0) {
                notifs[index].lida = true;
                localStorage.setItem(this.KEYS.NOTIFICACOES, JSON.stringify(notifs));
            }
        }
    }

    // --- AUTH ---
    static isAuthenticated(): boolean {
        return !!localStorage.getItem(this.KEYS.AUTH);
    }

    static login(token: string) {
        localStorage.setItem(this.KEYS.AUTH, token);
    }

    static logout() {
        localStorage.removeItem(this.KEYS.AUTH);
    }
}