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

interface RocketChatLoginResponse {
  status: string;
  data: {
    authToken: string;
    userId: string;
  };
}

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;
    rocketChatToken: string;
    rocketChatUserId: string;
  }

  interface JWT {
    accessToken: string;
    refreshToken: string;
    accessTokenExpires: number;
    role: string[];
    username: string;
    first_name: string;
    last_name: string;
    rocketChatToken: string;
    rocketChatUserId: string;
  }
}

declare module "next-auth/jwt" {
  interface JWT {
    accessToken: string;
    refreshToken: string;
    accessTokenExpires: number;
    role: string[];
    username: string;
    first_name: string;
    last_name: string;
    rocketChatToken: string;
    rocketChatUserId: string;
  }
}

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) {
        // Filter out system roles and only keep valid user roles
        const validRoles = (profile.groups || [])
          .filter((role: string) => 
            !role.startsWith('default-roles-') && 
            !['offline_access', 'uma_authorization'].includes(role)
          );

        return {
          id: profile.sub,
          name: profile.name ?? profile.preferred_username,
          email: profile.email,
          first_name: profile.given_name ?? '',
          last_name: profile.family_name ?? '',
          username: profile.preferred_username ?? profile.email?.split('@')[0] ?? '',
          role: validRoles,
        }
      },
    }),
  ],
  callbacks: {
    async jwt({ token, account, profile }) {
      console.log('JWT callback called with:', { token, account, profile });
      
      // Initial sign in
      if (account && profile) {
        // Set user data from profile
        token.username = profile.preferred_username;
        token.first_name = profile.given_name;
        token.last_name = profile.family_name;
        token.role = profile.groups || [];

        // Get user info from Rocket.Chat using the admin token
        const userInfoResponse = await fetch(`${process.env.ROCKET_CHAT_URL}/api/v1/users.info?username=${token.username}`, {
          headers: {
            'X-Auth-Token': process.env.ROCKET_CHAT_ADMIN_TOKEN as string,
            'X-User-Id': process.env.ROCKET_CHAT_ADMIN_USER_ID as string,
          },
        });

        if (!userInfoResponse.ok) {
          console.error('Failed to get user info:', {
            status: userInfoResponse.status,
            statusText: userInfoResponse.statusText,
            username: token.username
          });
          return token;
        }

        const userInfo = await userInfoResponse.json();
        console.log('User info response:', userInfo);

        if (!userInfo.user || !userInfo.user._id) {
          console.error('Invalid user info response:', userInfo);
          return token;
        }

        // Set the user's Rocket.Chat ID
        token.rocketChatUserId = userInfo.user._id;
        console.log('Set Rocket.Chat user ID:', token.rocketChatUserId);

        // Get personal access tokens for the user
        const tokensResponse = await fetch(`${process.env.ROCKET_CHAT_URL}/api/v1/users.getPersonalAccessTokens`, {
          headers: {
            'X-Auth-Token': process.env.ROCKET_CHAT_ADMIN_TOKEN as string,
            'X-User-Id': process.env.ROCKET_CHAT_ADMIN_USER_ID as string,
          },
        });

        if (!tokensResponse.ok) {
          console.error('Failed to get personal access tokens:', {
            status: tokensResponse.status,
            statusText: tokensResponse.statusText,
            username: token.username
          });
          return token;
        }

        const tokensData = await tokensResponse.json();
        console.log('Personal access tokens response:', tokensData);

        // Find existing token or create a new one
        let personalAccessToken = tokensData.tokens?.find((t: any) => t.name === 'NextAuth');
        if (!personalAccessToken) {
          console.log('No existing token found, creating new one');
          const createTokenResponse = await fetch(`${process.env.ROCKET_CHAT_URL}/api/v1/users.generatePersonalAccessToken`, {
            method: 'POST',
            headers: {
              'Content-Type': 'application/json',
              'X-Auth-Token': process.env.ROCKET_CHAT_ADMIN_TOKEN as string,
              'X-User-Id': process.env.ROCKET_CHAT_ADMIN_USER_ID as string,
            },
            body: JSON.stringify({
              tokenName: 'NextAuth',
              bypassTwoFactor: true,
            }),
          });

          if (!createTokenResponse.ok) {
            console.error('Failed to create personal access token:', {
              status: createTokenResponse.status,
              statusText: createTokenResponse.statusText,
              username: token.username
            });
            return token;
          }

          const createTokenData = await createTokenResponse.json();
          console.log('Create token response:', createTokenData);
          personalAccessToken = createTokenData.token;
        }

        // Set the personal access token
        token.rocketChatToken = personalAccessToken.token;
        console.log('Set Rocket.Chat token:', token.rocketChatToken);

        return token;
      }

      // Return previous token if it has Rocket.Chat credentials
      if (token.rocketChatToken && token.rocketChatUserId) {
        return token;
      }

      // Token refresh case
      if (Date.now() < (token.accessTokenExpires as number)) {
        return token;
      }

      try {
        const response = await fetch(
          `${process.env.KEYCLOAK_BASE_URL}/realms/${process.env.KEYCLOAK_REALM}/protocol/openid-connect/token`,
          {
            method: "POST",
            headers: {
              "Content-Type": "application/x-www-form-urlencoded",
            },
            body: new URLSearchParams({
              grant_type: "refresh_token",
              client_id: process.env.KEYCLOAK_CLIENT_ID!,
              client_secret: process.env.KEYCLOAK_CLIENT_SECRET!,
              refresh_token: token.refreshToken,
            }),
          }
        );

        const tokens = await response.json();

        if (!response.ok) throw tokens;

        return {
          ...token,
          accessToken: tokens.access_token,
          refreshToken: tokens.refresh_token ?? token.refreshToken,
          accessTokenExpires: Date.now() + tokens.expires_in * 1000,
        };
      } catch (error) {
        console.error("Error refreshing token:", error);
        return { ...token, error: "RefreshAccessTokenError" };
      }
    },

    async session({ session, token }) {
      if (token.error) {
        throw new Error("RefreshAccessTokenError");
      }

      console.log('Session callback token:', {
        hasRocketChatToken: !!token.rocketChatToken,
        hasRocketChatUserId: !!token.rocketChatUserId,
        token: token
      });

      return {
        ...session,
        accessToken: token.accessToken,
        rocketChatToken: token.rocketChatToken || '',
        rocketChatUserId: token.rocketChatUserId || '',
        user: {
          ...session.user,
          id: token.sub as string,
          first_name: token.first_name || '',
          last_name: token.last_name || '',
          username: token.username || '',
          role: token.role || [],
        },
      };
    },
  },
  events: {
    async signOut({ token }) {
      if (token.refreshToken) {
        try {
          await fetch(
            `${process.env.KEYCLOAK_BASE_URL}/realms/${process.env.KEYCLOAK_REALM}/protocol/openid-connect/logout`,
            {
              method: "POST",
              headers: {
                "Content-Type": "application/x-www-form-urlencoded",
              },
              body: new URLSearchParams({
                client_id: process.env.KEYCLOAK_CLIENT_ID!,
                client_secret: process.env.KEYCLOAK_CLIENT_SECRET!,
                refresh_token: token.refreshToken as string,
              }),
            }
          );
        } catch (error) {
          console.error("Error during logout:", error);
        }
      }
    },
  },
};

const handler = NextAuth(authOptions);
export { handler as GET, handler as POST };