import {
    BookProject,
    Chapter,
    Entity,
    Idea,
    UserProfile
} from '../types';

const API_BASE_URL = '/api'; // Proxied by Vite

// --- API CLIENT GENERIC ---

const api = {
    // Generic fetch with cookies
    // Generic fetch with cookies
    // Generic fetch with cookies
    async request<T = any>(endpoint: string, options: RequestInit = {}) {
        // Append Instance to query params
        const instanceId = "54770_plumeia"; // Fallback if env missing in some contexts
        const separator = endpoint.includes('?') ? '&' : '?';
        const url = `${API_BASE_URL}${endpoint}${separator}Instance=${instanceId}`;

        const headers = {
            'Content-Type': 'application/json',
            'X-Database-Instance': instanceId, // Keep header just in case
            ...options.headers,
        };

        const response = await fetch(url, {
            ...options,
            headers,
            credentials: 'include', // IMPORTANT: Send cookies
        });

        if (!response.ok) {
            let errorMsg = `Error ${response.status}: ${response.statusText}`;
            try {
                const errorJson = await response.json();
                console.error("API Error JSON:", errorJson);
                if (errorJson.error) errorMsg = errorJson.error;
                if (errorJson.message) errorMsg = errorJson.message;
            } catch (e) {
                // Ignore json parse error
            }
            throw new Error(errorMsg);
        }

        // Return null if 204 No Content
        if (response.status === 204) return null;

        return response.json();
    },

    // --- AUTH ENDPOINTS ---
    auth: {
        async getSession() {
            try {
                return await api.request('/user-auth/get-session');
            } catch (e) {
                return null; // No session
            }
        },

        async signIn(email: string, password: string) {
            return api.request('/user-auth/sign-in/email', {
                method: 'POST',
                body: JSON.stringify({ email, password }),
            });
        },

        async signUp(email: string, password: string, name: string) {
            return api.request('/user-auth/sign-up/email', {
                method: 'POST',
                body: JSON.stringify({ email, password, name }),
            });
        },

        async signOut() {
            return api.request('/user-auth/sign-out', {
                method: 'POST',
            });
        }
    },

    // --- DATA ENDPOINTS ---
    data: {
        // Generic list (read all)
        async list<T>(table: string) {
            // Swagger: GET /read/{table} -> { status: "success", data: [...] }
            const res = await api.request<{ data: T[] }>(`/data/read/${table}`);
            return res.data || [];
        },

        // Generic get (read one)
        async get<T>(table: string, id: string) {
            // Swagger: GET /read/{table}/{id} -> { status: "success", data: { ... } }
            const res = await api.request<{ data: T }>(`/data/read/${table}/${id}`);
            return res.data;
        },

        // Generic create
        async create<T>(table: string, data: any) {
            // Swagger: POST /create/{table} -> { status: "success", id: 123 }
            // Return the whole response so caller can get ID
            return api.request(`/data/create/${table}`, {
                method: 'POST',
                body: JSON.stringify(data),
            }) as Promise<T>;
        },

        // Generic update
        async update<T>(table: string, id: string, data: any) {
            // Swagger: PUT /update/{table}/{id}
            // Note: Swagger for update usually expects "update" path prefix
            return api.request(`/data/update/${table}/${id}`, {
                method: 'PUT',
                body: JSON.stringify(data),
            }) as Promise<T>;
        },

        // Generic delete
        async delete(table: string, id: string) {
            // Swagger: DELETE /delete/{table}/{id}
            return api.request(`/data/delete/${table}/${id}`, {
                method: 'DELETE',
            });
        },

        // --- Specialized Project Methods ---

        // Fetch full project with related data (chapters, entities, etc)
        // NOTE: In a real app, you might want to fetch these separately or use a join if supported.
        // For now, we'll fetch the project and then fetch its children.
        async getFullProject(projectId: string): Promise<BookProject> {
            const project = await this.get<any>('projects', projectId);

            // Fetch related data in parallel
            const [chapters, entities, ideas] = await Promise.all([
                api.request(`/data/chapters/list?project_id=${projectId}`),
                api.request(`/data/entities/list?project_id=${projectId}`),
                api.request(`/data/ideas/list?project_id=${projectId}`),
            ]);

            return {
                ...project,
                chapters: chapters || [],
                entities: entities || [],
                ideas: ideas || [],
                // templates: [], // Not yet in DB
                // workflow: null // Not yet in DB
            };
        }
    }
};

export default api;