import type { LinkEntry } from "../../common/lib";

const API_BASE = location.hostname == "localhost" || location.hostname == "127.0.0.1" ? "http://localhost:3001" : "";

interface ApiResponse<T> {
    success: boolean;
    data?: T;
    error?: string;
}

function getAuthHeader() {
    const password = localStorage.getItem("password");
    if (!password) throw new Error("No password found in localStorage");
    return { "X-Password": password };
}

async function request<T>(url: string, options: RequestInit = {}): Promise<ApiResponse<T>> {
    const headers = { ...options.headers, ...getAuthHeader() };
    let res: Response;

    try {
        res = await fetch(`${API_BASE}/api/${url}`, { ...options, headers });
    } catch {
        return { success: false, error: "Network error" };
    }

    let json = null;
    try {
        json = await res.json();
    } catch {
        return { success: false, error: `Server returned status ${res.status}` };
    }

    if (!res.ok) {
        return {
            success: false,
            error: json?.error || `Request failed with status ${res.status}`
        };
    }

    return {
        success: true,
        data: json as T
    };
}

export async function login(password: string): Promise<ApiResponse<void>> {
    localStorage.setItem("password", password);
    const res = await request<void>(`login`, { method: "POST" });
    return res;
}

export async function logout(): Promise<ApiResponse<void>> {
    localStorage.removeItem("password");
    return { success: true };
}

export async function getLinks(): Promise<ApiResponse<LinkEntry[]>> {
    return request<LinkEntry[]>("links");
}

export async function getLink(id: string): Promise<ApiResponse<LinkEntry>> {
    return request<LinkEntry>(`links/${id}`);
}

export async function createLink(link: Partial<LinkEntry>): Promise<ApiResponse<LinkEntry>> {
    return request<LinkEntry>("links", {
        method: "POST",
        body: JSON.stringify(link),
        headers: { "Content-Type": "application/json" },
    });
}

export async function updateLink(id: string, link: Partial<LinkEntry>): Promise<ApiResponse<LinkEntry>> {
    return request<LinkEntry>(`links/${id}`, {
        method: "PUT",
        body: JSON.stringify(link),
        headers: { "Content-Type": "application/json" },
    });
}

export async function deleteLink(id: string): Promise<ApiResponse<void>> {
    return request<void>(`links/${id}`, { method: "DELETE" });
}

export async function getLinkStats(id: string): Promise<ApiResponse<{ clicks: number }>> {
    return request<{ clicks: number }>(`links/${id}/stats`);
}