import NextAuth, { NextAuthOptions } from "next-auth";
import KeycloakProvider from "next-auth/providers/keycloak";

// Define Keycloak profile type
interface KeycloakProfile {
  sub: string;
  email?: string;
  name?: string;
  preferred_username?: string;
  given_name?: string;
  family_name?: string;
  realm_access?: {
    roles: string[];
  };
}

// Define custom profile type
interface CustomProfile {
  id: string;
  name?: string | null;
  email?: string | null;
  username: string;
  first_name: string;
  last_name: string;
  role: string[];
}

// Declare module augmentation for NextAuth types
declare module "next-auth" {
  interface Session {
    user: {
      id: string;
      name?: string | null;
      email?: string | null;
      image?: string | null;
      username: string;
      first_name: string;
      last_name: string;
      role: string[];
    };
    accessToken?: string;
  }

  interface JWT {
    sub?: string;
    accessToken?: string;
    refreshToken?: string;
    role?: string[];
    username?: string;
    first_name?: string;
    last_name?: string;
  }
}

// Simple, minimal implementation - NO REFRESH TOKEN LOGIC
export const authOptions: NextAuthOptions = {
  providers: [
    KeycloakProvider({
      clientId: process.env.KEYCLOAK_CLIENT_ID || "",
      clientSecret: process.env.KEYCLOAK_CLIENT_SECRET || "",
      issuer: process.env.KEYCLOAK_ISSUER || "",
      profile(profile: any) {
        // Just return a simple profile with required fields
        return {
          id: profile.sub,
          name: profile.name || profile.preferred_username,
          email: profile.email,
          image: null,
          username: profile.preferred_username || profile.email?.split('@')[0] || '',
          first_name: profile.given_name || '',
          last_name: profile.family_name || '',
          role: ['user'],
          // Store raw profile data for later processing
          raw_profile: profile
        };
      }
    }),
  ],
  session: {
    strategy: "jwt",
    maxAge: 8 * 60 * 60, // 8 hours
  },
  callbacks: {
    async jwt({ token, account, profile, user }: any) {
      // Initial sign in
      if (account && account.access_token) {
        token.accessToken = account.access_token;
        token.refreshToken = account.refresh_token;
        
        // Process the raw profile data if available
        if (user && user.raw_profile) {
          const rawProfile = user.raw_profile;
          
          // Extract roles from all possible sources
          let roles: string[] = [];
          
          // Get roles from realm_access
          if (rawProfile.realm_access && Array.isArray(rawProfile.realm_access.roles)) {
            roles = roles.concat(rawProfile.realm_access.roles);
          }
          
          // Get roles from resource_access
          if (rawProfile.resource_access) {
            const clientId = process.env.KEYCLOAK_CLIENT_ID;
            if (clientId && 
                rawProfile.resource_access[clientId] && 
                Array.isArray(rawProfile.resource_access[clientId].roles)) {
              roles = roles.concat(rawProfile.resource_access[clientId].roles);
            }
            
            // Also check resource_access roles under 'account'
            if (rawProfile.resource_access.account && 
                Array.isArray(rawProfile.resource_access.account.roles)) {
              roles = roles.concat(rawProfile.resource_access.account.roles);
            }
          }
          
          // Clean up roles and convert to lowercase
          const cleanedRoles = roles
            .filter(Boolean) 
            .map(role => role.toLowerCase());
            
          // Always ensure user has basic user role
          const finalRoles = [...new Set([...cleanedRoles, 'user'])];
          
          // Map Keycloak roles to application roles
          token.role = mapToApplicationRoles(finalRoles);
        } else if (user && user.role) {
          token.role = Array.isArray(user.role) ? user.role : [user.role];
        } else {
          // Default roles if no profile data available
          token.role = ['user'];
        }
        
        // Store user information
        if (user) {
          token.username = user.username || user.name || '';
          token.first_name = user.first_name || '';
          token.last_name = user.last_name || '';
        }
      } 
      // Token exists but no roles, add default user role
      else if (token && !token.role) {
        token.role = ['user'];
      }
      
      return token;
    },
    async session({ session, token }: any) {
      // Pass necessary info to the session
      session.accessToken = token.accessToken;
      if (session.user) {
        session.user.id = token.sub || "";
        
        // Ensure roles are passed to the session
        if (token.role && Array.isArray(token.role)) {
          session.user.role = token.role;
          session.user.username = token.username || '';
          session.user.first_name = token.first_name || '';
          session.user.last_name = token.last_name || '';
        } else {
          // Fallback roles
          session.user.role = ["user"];
          session.user.username = '';
          session.user.first_name = '';
          session.user.last_name = '';
        }
      }
      return session;
    }
  },
  pages: {
    signIn: '/signin',
    error: '/signin',
  },
  cookies: {
    sessionToken: {
      name: 'next-auth.session-token',
      options: {
        httpOnly: true,
        sameSite: 'none',
        path: '/',
        secure: true,
      },
    },
  },
  debug: process.env.NODE_ENV === 'development',
};

/**
 * Maps Keycloak roles to application-specific roles
 */
function mapToApplicationRoles(keycloakRoles: string[]): string[] {
  const mappings: Record<string, string[]> = {
    // Map Keycloak roles to your application's role names
    'admin': ['admin', 'dataintelligence', 'coding', 'expression', 'mediation'],
    'owner': ['admin', 'dataintelligence', 'coding', 'expression', 'mediation'],
    'cercle-admin': ['admin', 'dataintelligence', 'coding', 'expression', 'mediation'],
    'manager': ['dataintelligence', 'coding', 'expression', 'mediation'],
    'developer': ['coding', 'dataintelligence'],
    'data-scientist': ['dataintelligence'],
    'designer': ['expression'],
    'writer': ['expression'],
    'mediator': ['mediation'],
    // Default access roles from Keycloak
    'default-roles-cercle': ['user'],
    'uma_authorization': ['user'],
    'offline_access': ['user'],
    // Add more mappings as needed
  };

  // Map each role and flatten the result
  let appRoles: string[] = ['user']; // Always include 'user' role
  
  for (const role of keycloakRoles) {
    const mappedRoles = mappings[role.toLowerCase()];
    if (mappedRoles) {
      appRoles = [...appRoles, ...mappedRoles];
    }
  }
  
  // Remove duplicates and return
  return [...new Set(appRoles)];
}

const handler = NextAuth(authOptions);

export { handler as GET, handler as POST };