/**
 * Copyright (c) 2026 Niolla
 * All rights reserved.
 *
 * This source code is proprietary and confidential.
 * Unauthorized copying, modification, distribution, or use
 * of this file, via any medium, is strictly prohibited.
 */

// app/controllers/user.controller.js

const db = require("../models");
const { hashPassword } = require("../utils/hashPassword.util");
const {
  validatePassword,
} = require("../utils/validation/validatePassword.util");
const { validateEmail } = require("../utils/validation/validateEmail.util");
const { generateUserId, generateId } = require("../utils/idGen.util");
const {
  createCustomerDetails,
} = require("../utils/users/createCustomerDetails.util");
const {
  createBusinessCustomerDetails,
} = require("../utils/users/createBusinessCustomer.util");
const { logActivity } = require("../services/activity.service");
const { sendMail } = require("../utils/mail.util");
const {
  createEmailVerification,
  verifyEmailVerificationToken,
  sendVerificationEmail,
  deleteEmailVerification,
} = require("../utils/emailVerification.util");
const { getUserProfile } = require("../utils/users/userProfileDetails.util");
const User = db.User;
const Profile = db.Profile;

// Create a new user
exports.createNewUser = async (req, res) => {
  const transaction = await db.sequelize.transaction();

  try {
    const {
      firstName,
      lastName,
      email,
      password,
      accountType,
      address,
      phoneNumber,
      businessName,
      businessRegistrationNumber,
      businessType,
      contactName,
      businessEmail,
      expectedMonthlyVolume,
      note,
    } = req.body;

    if (!firstName || !lastName || !email || !password || !accountType) {
      await transaction.rollback();

      return res.status(400).send({
        success: false,
        message:
          "First name, last name, email, password and account type are required",
      });
    }

    if (accountType !== "customer" && accountType !== "business_customer") {
      await transaction.rollback();

      return res.status(400).send({
        success: false,
        message:
          "Invalid account type. Must be either 'customer' or 'business_customer'",
      });
    }

    const emailValid = validateEmail(email);

    if (!emailValid) {
      await transaction.rollback();

      return res.status(400).send({
        success: false,
        message: "Invalid email address",
      });
    }

    const userExists = await User.findOne({ where: { email } });
    if (userExists) {
      await transaction.rollback();

      return res.status(400).send({
        success: false,
        message: "User with this email already exists",
      });
    }

    const validatePasswordResult = validatePassword(password);

    if (!validatePasswordResult) {
      await transaction.rollback();
      return res.status(400).send({
        success: false,
        message: "Password does not meet the required criteria",
      });
    }

    const hashedPassword = await hashPassword(password);

    const userID = generateUserId();

    const newUser = await User.create(
      {
        id: userID,
        firstName,
        lastName,
        email,
        password: hashedPassword,
        accountType,
        accountStatus: "PENDING_VERIFICATION",
        emailVerifiedAt: null,
      },
      { transaction },
    );

    const newProfile = await Profile.create(
      {
        profile_id: generateId(),
        user_id: newUser.id,
        theme: "light",
        notificationsEnabled: true,
        profilePicture_id: "N/A",
        backgroundImage_id: "N/A",
        dob: null,
        phone_number: null,
      },
      { transaction },
    );

    //create customer and business customer
    if (accountType === "customer") {
      const customerData = {
        address,phoneNumber,
      };

      await createCustomerDetails(
        newUser.id,
        customerData,
        transaction,
      );
    } else if (accountType === "business_customer") {
      const businessData = {
        businessName,
        businessRegistrationNumber,
        businessType,
        contactName,
        phoneNumber,
        businessEmail,
        expectedMonthlyVolume,
        note,
      };

      await createBusinessCustomerDetails(
        newUser.id,
        businessData,
        transaction,
      );
    }

    await transaction.commit();

    const verificationToken = await createEmailVerification(newUser.id);

    try {
      await sendVerificationEmail(
        newUser.email,
        newUser.firstName,
        verificationToken,
      );
    } catch (error) {
      console.error("Error sending verification email:", error);
    }

    await logActivity({
      user: newUser,
      description: `Created New User with ID: ${newUser.id}`,
      type: "CREATE_USER",
      module: "User Management",
    });

    res.status(201).send({
      success: true,
      message: "User Created Successfully",
      data: {
        id: newUser.id,
        firstName: newUser.firstName,
        lastName: newUser.lastName,
        email: newUser.email,
        accountType: newUser.accountType,
        
      },
    });
  } catch (error) {
    if (!transaction.finished) {
      await transaction.rollback();
    }

    console.error("CREATE USER ERROR:", error);

    res.status(500).send({
      success: false,
      message: "Failed to create user",
      error: error.message,
    });
  }
};

// Verify customer email
exports.verifyEmail = async (req, res) => {
  const transaction = await db.sequelize.transaction();

  try {
    const { token } = req.body;

    if (!token) {
      await transaction.rollback();

      return res.status(400).send({
        success: false,

        message: "Verification token is required",
      });
    }

    const verification = await verifyEmailVerificationToken(token);

    if (!verification) {
      await transaction.rollback();

      return res.status(400).send({
        success: false,

        message: "Verification token is invalid or expired",
      });
    }

    const { userId, redisKey } = verification;

    const user = await User.findOne({
      where: {
        id: userId,
      },

      transaction,
    });

    if (!user) {
      await transaction.rollback();

      await deleteEmailVerification(redisKey);

      return res.status(404).send({
        success: false,

        message: "User not found",
      });
    }

    if (user.accountStatus === "ACTIVE" && user.emailVerifiedAt) {
      await transaction.rollback();

      // Token is no longer needed
      await deleteEmailVerification(redisKey);

      return res.status(400).send({
        success: false,

        message: "Email is already verified",
      });
    }

    user.accountStatus = "ACTIVE";

    user.emailVerifiedAt = new Date();

    await user.save({
      transaction,
    });

    await transaction.commit();

    await deleteEmailVerification(redisKey);

    return res.status(200).send({
      success: true,

      message: "Email verified successfully. Your account is now active.",
    });
  } catch (error) {
    if (!transaction.finished) {
      await transaction.rollback();
    }

    console.error("VERIFY EMAIL ERROR:", error);

    return res.status(500).send({
      success: false,

      message: "Failed to verify email",
    });
  }
};

// Get users with pagination (20 per page)
exports.getAllUsers = async (req, res) => {
  try {
    const page = parseInt(req.query.page) || 1; // default page = 1
    const limit = 20;
    const offset = (page - 1) * limit;

    const { count, rows: users } = await User.findAndCountAll({
      attributes: { exclude: ["password"] },
      limit,
      offset,
      order: [["createdAt", "DESC"]], // optional sorting
    });

    res.status(200).send({
      success: true,
      data: users,
      pagination: {
        totalUsers: count,
        totalPages: Math.ceil(count / limit),
        currentPage: page,
        pageSize: limit,
      },
    });
  } catch (error) {
    res.status(500).send({
      success: false,
      message: "Failed to retrieve users",
      error: error.message,
    });
  }
};

//get user profile details
exports.userProfile = async (req, res) => {

  try {
    const userId = req.user.id;

    const profile =
      await getUserProfile(userId);


    if (!profile) {
      return res.status(404).send({
        success: false,
        message: "User not found",
      });
    }


    return res.status(200).send({
      success: true,
      message:
        "User profile retrieved successfully",

      data: profile,
    });


  } catch (error) {

    console.error(
      "GET USER PROFILE ERROR:",
      error
    );


    return res.status(500).send({
      success: false,
      message:
        "Failed to retrieve user profile",
    });

  }

};

// Get user details by ID
// exports.getUserById = async (req, res) => {
//   try {
//     const { id } = req.params;
//     const user = await User.findOne({
//       where: { id },
//       attributes: { exclude: ["password"] },
//       include: [{ model: Profile, as: "profile" }],
//     });

//     if (!user) {
//       return res.status(404).send({
//         success: false,
//         message: "User not found",
//       });
//     }

//     res.status(200).send({
//       success: true,
//       data: user,
//     });
//   } catch (error) {
//     res.status(500).send({
//       success: false,
//       message: "Failed to retrieve user",
//       error: error.message,
//     });
//   }
// };

// Update user details
exports.updateUser = async (req, res) => {
  const transaction = await db.sequelize.transaction();
  try {
    const { id } = req.params;
    const {
      firstName,
      lastName,
      email,
      role,
      roleID,
      accountType,
      department,
      theme,
      notificationsEnabled,
      profilePicture_id,
      backgroundImage_id,
      dob,
      phone_number,
    } = req.body;
    const user = await User.findOne({
      where: { id },
    });
    const UserProfile = await Profile.findOne({
      where: { user_id: id },
    });

    if (!user) {
      return res.status(404).send({
        success: false,
        message: "User not found",
      });
    }

    if (!UserProfile) {
      return res.status(404).send({
        success: false,
        message: "User profile not found",
      });
    }

    user.firstName = firstName || user.firstName;
    user.lastName = lastName || user.lastName;
    user.role = role || user.role;
    user.roleID = roleID || user.roleID || "N/A";
    user.accountType = accountType || user.accountType;
    user.department = department || user.department;

    UserProfile.theme = theme || UserProfile.theme;
    UserProfile.notificationsEnabled =
      notificationsEnabled !== undefined
        ? notificationsEnabled
        : UserProfile.notificationsEnabled;
    UserProfile.profilePicture_id =
      profilePicture_id || UserProfile.profilePicture_id || "N/A";
    UserProfile.backgroundImage_id =
      backgroundImage_id || UserProfile.backgroundImage_id || "N/A";
    UserProfile.dob = dob || UserProfile.dob;
    UserProfile.phone_number = phone_number || UserProfile.phone_number;

    await UserProfile.save({ transaction });
    await user.save({ transaction });
    await transaction.commit();

    await logActivity({
      user: req.user,
      description: `Updated User with ID: ${user.id}`,
      type: "UPDATE_USER",
      module: "User Management",
    });

    const data = {
      id: user.id,
      firstName: user.firstName,
      lastName: user.lastName,
      email: user.email,
      accountType: user.accountType,
      role: user.role,
      department: user.department,
      profile: {
        theme: UserProfile.theme,
        notificationsEnabled: UserProfile.notificationsEnabled,
        profilePicture_id: UserProfile.profilePicture_id,
        backgroundImage_id: UserProfile.backgroundImage_id,
        dob: UserProfile.dob,
        phone_number: UserProfile.phone_number,
      },
    };

    res.status(200).send({
      success: true,
      message: "User updated successfully",
      data,
    });
  } catch (error) {
    await transaction.rollback();
    res.status(500).send({
      success: false,
      message: `Error: ${error.message}`,
    });
  }
};

// Delete user
exports.deleteUser = async (req, res) => {
  const transaction = await db.sequelize.transaction();
  try {
    const { id } = req.params;
    const user = await User.findOne({
      where: { id },
    });
    if (!user) {
      return res.status(404).send({
        success: false,
        message: "User not found",
      });
    }
    await user.destroy({ transaction });
    await transaction.commit();

    await logActivity({
      user: req.user,
      description: `Deleted User with ID: ${user.id}`,
      type: "DELETE_USER",
      module: "User Management",
    });

    res.status(200).send({
      success: true,
      message: "User deleted successfully",
    });
  } catch (error) {
    await transaction.rollback();
    res.status(500).send({
      success: false,
      message: `Error: ${error.message}`,
    });
  }
};