const fs = require("node:fs");
const path = require("node:path");
const Resume = require("../models/Resume");

// @desc    Create a new resume
// @route   POST /api/resumes
// @access  Private
const createResume = async (req, res) => {
  try {
    const { title } = req.body;

    // Default template
    const defaultResumeData = {
      profileInfo: {
        profileImg: null,
        previewUrl: "",
        fullName: "",
        designation: "",
        summary: "",
      },
      contactInfo: {
        email: "",
        phone: "",
        location: "",
        linkedin: "",
        github: "",
        website: "",
      },
      workExperience: [
        {
          company: "",
          role: "",
          startDate: "",
          endDate: "",
          description: "",
        },
      ],
      education: [
        {
          degree: "",
          institution: "",
          startDate: "",
          endDate: "",
        },
      ],
      skills: [
        {
          name: "",
          progress: 0,
        },
      ],
      projects: [
        {
          title: "",
          description: "",
          github: "",
          liveDemo: "",
        },
      ],
      certifications: [
        {
          title: "",
          issuer: "",
          year: "",
        },
      ],
      languages: [
        {
          name: "",
          progress: 0,
        },
      ],
      interests: [""],
    };

    const newResume = await Resume.create({
      userId: req.user._id,
      title,
      ...defaultResumeData,
    });

    res.status(201).json(newResume);
  } catch (error) {
    res
      .status(500)
      .json({ message: "Failed to create resume", error: error.message });
  }
};

// @desc    Get all resumes for logged-in user
// @route   GET /api/resumes
// @access  Private
const getUserResumes = async (req, res) => {
  try {
    const resumes = await Resume.find({ userId: req.user._id }).sort({
      updatedAt: -1,
    });
    res.json(resumes);
  } catch (error) {
    res
      .status(500)
      .json({ message: "Failed to create resume", error: error.message });
  }
};

// @desc    Get single resume by ID
// @route   GET /api/resumes/:id
// @access  Private
const getResumeById = async (req, res) => {
  try {
    const resume = await Resume.findOne({ _id: req.params.id, userId: req.user._id });

    if (!resume) {
      return res.status(404).json({ message: "Resume not found" });
    }

    res.json(resume);
  } catch (error) {
    res
      .status(500)
      .json({ message: "Failed to create resume", error: error.message });
  }
};

// @desc    Update a resume
// @route   PUT /api/resumes/:id
// @access  Private
const updateResume = async (req, res) => {
  try {
    const resume = await Resume.findOne({
      _id: req.params.id,
      userId: req.user._id,
    });

    if (!resume) {
      return res.status(404).json({ message: "Resume not found or unauthorized" });
    }

    // Merge updates from req.body into existing resume
    Object.assign(resume, req.body);

    // Save updated resume
    const savedResume = await resume.save();

    res.json(savedResume);
  } catch (error) {
    res
      .status(500)
      .json({ message: "Failed to create resume", error: error.message });
  }
};

// @desc    Delete a resume
// @route   DELETE /api/resumes/:id
// @access  Private
const deleteResume = async (req, res) => {
  try {
    const resume = await Resume.findOne({
      _id: req.params.id,
      userId: req.user._id,
    });

    if (!resume) {
      return res.status(404).json({ message: "Resume not found or unauthorized" });
    }

    // Delete thumbnailLink and profilePreviewUrl images from uploads folder
    const uploadsFolder = path.join(__dirname, '..', 'uploads');
    const baseUrl = `${req.protocol}://${req.get("host")}`;

    if(resume.thumbnailLink){
      const oldThumbnail = path.join(uploadsFolder, path.basename(resume.thumbnailLink));
      if (fs.existsSync(oldThumbnail)) fs.unlinkSync(oldThumbnail);
    }

    if(resume.profileInfo?.profilePreviewUrl){
      const oldProfile = path.join(uploadsFolder, path.basename(resume.profileInfo.profilePreviewUrl));
      if (fs.existsSync(oldProfile)) fs.unlinkSync(oldProfile);
    }

    const deleted = await Resume.findOneAndDelete({
      _id: req.params.id,
      userId: req.user._id,
    });

    if (!deleted) {
      return res.status(404).json({ message: "Resume not found or unauthorized" });
    }

    res.json({ message: "Resume deleted successfully" });
  } catch (error) {
    res
      .status(500)
      .json({ message: "Failed to create resume", error: error.message });
  }
};

module.exports = {
  createResume,
  getUserResumes,
  getResumeById,
  updateResume,
  deleteResume,
};