"use client";

import { createContext, useContext, useEffect, useState, useCallback, ReactNode } from "react";
import { clientExecute } from "@/lib/api/client";
import { AuthUser, AuthToken } from "@/lib/types";

interface SignupInput {
  name: string;
  email: string;
  phone: string;
  password: string;
  confirmPassword: string;
  role: "tenant" | "landlord";
  agreedToTerms: boolean;
}

interface AuthContextValue {
  user: AuthUser | null;
  loading: boolean;
  login: (email: string, password: string) => Promise<AuthUser>;
  signup: (input: SignupInput) => Promise<AuthUser>;
  /** For flows that already hold a token (partner.login, accommodation.register). */
  adoptSession: (token: AuthToken) => Promise<AuthUser>;
  logout: () => Promise<void>;
  refresh: () => Promise<void>;
}

const AuthContext = createContext<AuthContextValue | null>(null);

async function persist(accessToken: string) {
  await fetch("/api/session", {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({ accessToken }),
  });
}

export function AuthProvider({ children }: { children: ReactNode }) {
  const [user, setUser] = useState<AuthUser | null>(null);
  const [loading, setLoading] = useState(true);

  const refresh = useCallback(async () => {
    try {
      setUser(await clientExecute<AuthUser>("auth.me"));
    } catch {
      setUser(null);
    } finally {
      setLoading(false);
    }
  }, []);

  useEffect(() => {
    void refresh();
  }, [refresh]);

  const login = useCallback(async (email: string, password: string) => {
    const token = await clientExecute<AuthToken>("auth.login", { email, password });
    await persist(token.accessToken);
    setUser(token.user);
    return token.user;
  }, []);

  const signup = useCallback(async (input: SignupInput) => {
    const token = await clientExecute<AuthToken>("auth.signup", input);
    await persist(token.accessToken);
    setUser(token.user);
    return token.user;
  }, []);

  const adoptSession = useCallback(async (token: AuthToken) => {
    await persist(token.accessToken);
    setUser(token.user);
    return token.user;
  }, []);

  const logout = useCallback(async () => {
    try {
      await clientExecute("auth.logout");
    } catch {
      /* ignore */
    }
    await fetch("/api/session", { method: "DELETE" });
    setUser(null);
  }, []);

  return (
    <AuthContext.Provider value={{ user, loading, login, signup, adoptSession, logout, refresh }}>
      {children}
    </AuthContext.Provider>
  );
}

export function useAuth(): AuthContextValue {
  const ctx = useContext(AuthContext);
  if (!ctx) throw new Error("useAuth must be used within <AuthProvider>");
  return ctx;
}