import type {
	Agent,
	AdminUser,
	AuditLog,
	ChangeRequest,
	GlobalSettings,
	Notification,
	RequestState,
	User,
} from "./types";

export class ApiError extends Error {
	status: number;
	data?: unknown;
	constructor(message: string, status: number, data?: unknown) {
		super(message);
		this.status = status;
		this.data = data;
	}
}

async function api<T = unknown>(path: string, opts: RequestInit = {}): Promise<T> {
	const res = await fetch(path, {
		credentials: "include",
		headers:
			opts.body && !(opts.headers && "Content-Type" in opts.headers)
				? { "Content-Type": "application/json", ...(opts.headers || {}) }
				: opts.headers,
		...opts,
	});
	let body: any = null;
	try {
		body = await res.json();
	} catch {
		/* no body */
	}
	if (!res.ok || body?.status === "FAILED") {
		throw new ApiError(body?.message || `Request failed (${res.status})`, res.status, body?.data);
	}
	return (body?.data ?? body) as T;
}

// ── Auth ──────────────────────────────────────────────────────────────────────
export const auth = {
	me: () => api<User>("/api/auth/me"),
	login: (username: string, password: string, totp?: string) =>
		api<User>("/api/auth/login", { method: "POST", body: JSON.stringify({ username, password, totp }) }),
	register: (username: string, display_name: string, password: string) =>
		api<User>("/api/auth/register", {
			method: "POST",
			body: JSON.stringify({ username, display_name, password }),
		}),
	logout: () => api("/api/auth/logout", { method: "POST" }),
	setup2fa: () => api<{ secret: string; otpauth_url: string }>("/api/auth/2fa/setup", { method: "POST" }),
	enable2fa: (totp: string) => api("/api/auth/2fa/enable", { method: "POST", body: JSON.stringify({ totp }) }),
	disable2fa: (password: string) =>
		api("/api/auth/2fa/disable", { method: "POST", body: JSON.stringify({ password }) }),
};

// ── Account ────────────────────────────────────────────────────────────────────
export const account = {
	updateProfile: (display_name: string) =>
		api("/api/account/profile", { method: "PATCH", body: JSON.stringify({ display_name }) }),
	changePassword: (current_password: string, new_password: string) =>
		api("/api/account/password", {
			method: "POST",
			body: JSON.stringify({ current_password, new_password }),
		}),
	updateSettings: (settings: { auto_delete_enabled?: boolean; auto_delete_days?: number }) =>
		api<{ auto_delete_enabled: boolean; auto_delete_days: number }>("/api/account/settings", {
			method: "PATCH",
			body: JSON.stringify(settings),
		}),
	deleteAccount: (password: string) =>
		api("/api/account", { method: "DELETE", body: JSON.stringify({ password, confirm: "DELETE" }) }),
	exportUrl: "/api/account/export",
};

// ── Agents ─────────────────────────────────────────────────────────────────────
export const agents = {
	list: () => api<Agent[]>("/api/agents"),
	create: (input: Partial<Agent>) => api<Agent>("/api/agents", { method: "POST", body: JSON.stringify(input) }),
	update: (id: number, input: Partial<Agent>) =>
		api<Agent>(`/api/agents/${id}`, { method: "PATCH", body: JSON.stringify(input) }),
	regenerateKey: (id: number) => api<Agent>(`/api/agents/${id}/regenerate-key`, { method: "POST" }),
	setDisabled: (id: number, disabled: boolean) =>
		api<Agent>(`/api/agents/${id}/disabled`, { method: "POST", body: JSON.stringify({ disabled }) }),
	remove: (id: number) => api(`/api/agents/${id}`, { method: "DELETE" }),
};

// ── Change requests (human) ──────────────────────────────────────────────────────
export const requests = {
	list: (params: { page?: number; page_size?: number; state?: string; agent_id?: number } = {}) => {
		const q = new URLSearchParams();
		if (params.page) q.set("page", String(params.page));
		if (params.page_size) q.set("page_size", String(params.page_size));
		if (params.state) q.set("state", params.state);
		if (params.agent_id) q.set("agent_id", String(params.agent_id));
		return api<{ page: number; page_size: number; total: number; requests: ChangeRequest[] }>(
			`/api/change-requests?${q.toString()}`,
		);
	},
	summary: () => api<{ counts: Record<RequestState, number> }>("/api/change-requests/summary"),
	get: (id: string) => api<ChangeRequest>(`/api/change-requests/${id}`),
	decide: (id: string, decision: "APPROVE" | "REJECT" | "REQUEST_CHANGES", comment?: string) =>
		api<ChangeRequest>(`/api/change-requests/${id}/decision`, {
			method: "POST",
			body: JSON.stringify({ decision, comment }),
		}),
};

// ── Notifications ────────────────────────────────────────────────────────────────
export const notifications = {
	list: (params: { page?: number; page_size?: number; unread?: boolean } = {}) => {
		const q = new URLSearchParams();
		if (params.page) q.set("page", String(params.page));
		if (params.page_size) q.set("page_size", String(params.page_size));
		if (params.unread) q.set("unread", "true");
		return api<{ total: number; unread_count: number; notifications: Notification[] }>(
			`/api/notifications?${q.toString()}`,
		);
	},
	markRead: (id: number) => api(`/api/notifications/${id}/read`, { method: "POST" }),
	markAllRead: () => api("/api/notifications/read-all", { method: "POST" }),
	clear: () => api("/api/notifications", { method: "DELETE" }),
};

// ── Global ───────────────────────────────────────────────────────────────────────
export const global = {
	get: () => api<GlobalSettings>("/api/global"),
};

// ── Admin ─────────────────────────────────────────────────────────────────────────
export const admin = {
	users: () => api<AdminUser[]>("/api/admin/users"),
	updateUser: (id: number, input: { role?: "ADMIN" | "USER"; disabled?: boolean }) =>
		api(`/api/admin/users/${id}`, { method: "PATCH", body: JSON.stringify(input) }),
	deleteUser: (id: number) => api(`/api/admin/users/${id}`, { method: "DELETE" }),
	settings: () => api<GlobalSettings>("/api/admin/settings"),
	updateSettings: (input: { registration_enabled?: boolean; requests_enabled?: boolean }) =>
		api<GlobalSettings>("/api/admin/settings", { method: "PATCH", body: JSON.stringify(input) }),
	agents: () => api<(Agent & { owner: { id: number; username: string } })[]>("/api/admin/agents"),
	setAgentDisabled: (id: number, disabled: boolean) =>
		api(`/api/admin/agents/${id}/disabled`, { method: "POST", body: JSON.stringify({ disabled }) }),
	deleteAgent: (id: number) => api(`/api/admin/agents/${id}`, { method: "DELETE" }),
	auditLogs: (page = 1) =>
		api<{ total: number; page: number; page_size: number; logs: AuditLog[] }>(
			`/api/admin/audit-logs?page=${page}`,
		),
};