const express = require("express");
const cors = require("cors");
const { PrismaClient } = require("@prisma/client");

const app = express();
const prisma = new PrismaClient();
const PORT = process.env.PORT || 4000;

// Middleware
app.use(cors());
app.use(express.json());


/* Blog Crud */


// Create a New Blog
app.post("/blogs", async (req, res) => {
  const { slug, title, body, categoryIDs, tagIDs } = req.body;

  try {
    const newBlog = await prisma.blog.create({
      data: { slug, title, body, categoryIDs, tagIDs },
    });
    res.status(201).json(newBlog);
  } catch (err) {
    console.error("Error while creating a New Blog:", err);
    res
      .status(400)
      .json({ error: "Error while creating a New Blog", details: err.message });
  }
});

// Get all blogs
app.get("/blogs", async (req, res) => {
  try {
    const blogs = await prisma.blog.findMany({
      include: { comments: true, categories: true, tags: true },
    });
    res.status(200).json(blogs);
  } catch (error) {
    console.log("Error while fetching a blogs:", err);
    res
      .status(400)
      .json({ error: "Error fetching blogs", details: err.message });
  }
});

// Get blog by slug
app.get("/blogs/:slug", async (req, res) => {
  const { slug } = req.params;
  try {
    const blog = await prisma.blog.findUnique({
      where: { slug },
      include: { comments: true, categories: true, tags: true },
    });
    if (blog) res.status(200).json(blog);
    else res.status(404).json({ error: "Blog not found" });
  } catch (error) {
    console.log("Error while blog by slug:", err);
    res
      .status(400)
      .json({ error: "Error fetching blog", details: err.message });
  }
});

// Update a blog
app.put("/blogs/:slug", async (req, res) => {
  const { slug } = req.params;
  const { title, body, categoryIDs, tagIDs } = req.body;
  try {
    const updatedBlog = await prisma.blog.update({
      where: { slug },
      data: { title, body, categoryIDs, tagIDs },
    });
    res.status(200).json(updatedBlog);
  } catch (error) {
    console.log("Error while uploading a Blog:", err);
    res
      .status(400)
      .json({ error: "Error updating blog", details: err.message });
  }
});

// Delete a blog
app.delete("/blogs/:slug", async (req, res) => {
  const { slug } = req.params;
  try {
    await prisma.blog.delete({
      where: { slug },
    });
    res.status(204).send();
  } catch (error) {
    console.log("Error while deleting a Blog:", err);
    res
      .status(400)
      .json({ error: "Error deleting blog", details: err.message });
  }
});



/* Category CRUD */



// Create a New Category
app.post("/categories", async (req, res) => {
  const { name } = req.body;

  try {
    const newCategory = await prisma.category.create({
      data: { name },
    });
    res.status(201).json(newCategory);
  } catch (err) {
    console.error("Error while creating a New Category:", err);
    res.status(400).json({
      error: "Error while creating a New Category",
      details: err.message,
    });
  }
});

// Get all categories
app.get("/categories", async (req, res) => {
  try {
    const categories = await prisma.category.findMany();
    res.status(200).json(categories);
  } catch (err) {
    console.error("Error while fetching categories:", err);
    res.status(400).json({
      error: "Error fetching categories",
      details: err.message,
    });
  }
});

// Update a category
app.put("/categories/:id", async (req, res) => {
  const { id } = req.params;
  const { name } = req.body;
  try {
    const updatedCategory = await prisma.category.update({
      where: { id },
      data: { name },
    });
    res.status(200).json(updatedCategory);
  } catch (err) {
    console.log("Error while updating a Category:", err);
    res
      .status(400)
      .json({ error: "Error updating category", details: err.message });
  }
});

// Delete a category
app.delete("/categories/:id", async (req, res) => {
  const { id } = req.params;
  try {
    await prisma.category.delete({
      where: { id },
    });
    res.status(204).send();
  } catch (err) {
    console.log("Error while deleting a Category:", err);
    res
      .status(400)
      .json({ error: "Error deleting category", details: err.message });
  }
});




/* Comments  */



// Post a comment
app.post("/comments", async (req, res) => {
  const { comment, blogId } = req.body;

  try {
    const newComment = await prisma.comment.create({
      data: { comment, blogId },
    });
    res.status(201).json(newComment);
  } catch (err) {
    console.error("Error while creating a New Comment:", err);
    res.status(400).json({
      error: "Error while creating a New Comment",
      details: err.message,
    });
  }
});

// Get comments
app.get("/comments", async (req, res) => {
  try {
    const comments = await prisma.comment.findMany({
      include: { blog: true },
    });
    res.status(200).json(comments);
  } catch (err) {
    console.error("Error while fetching comments:", err);
    res.status(400).json({
      error: "Error fetching comments",
      details: err.message,
    });
  }
});

//  Update a comment
app.put("/comments/:id", async (req, res) => {
  const { id } = req.params;
  const { comment } = req.body;

  try {
    const updatedComment = await prisma.comment.update({
      where: { id },
      data: { comment },
    });
    res.status(200).json(updatedComment);
  } catch (err) {
    console.error("Error while updating a comment:", err);
    res.status(400).json({
      error: "Error updating comment",
      details: err.message,
    });
  }
});

// Delete a comment
app.delete("/comments/:id", async (req, res) => {
  const { id } = req.params;

  try {
    await prisma.comment.delete({
      where: { id },
    });
    res.status(204).send();
  } catch (err) {
    console.error("Error while deleting a comment:", err);
    res.status(400).json({
      error: "Error deleting comment",
      details: err.message,
    });
  }
});




/* Blogs Tags */




// Create a new tag
app.post("/blogs/tag", async (req, res) => {
  const { name } = req.body;

  try {
    const newTag = await prisma.tag.create({
      data: { name },
    });
    res.status(201).json(newTag);
  } catch (err) {
    console.error("Error while creating a New Tag:", err);
    res.status(400).json({
      error: "Error while creating a New Tag",
      details: err.message,
    });
  }
});

// Fetch all the tags
app.get("/blogs/tags", async (req, res) => {
  try {
    const tags = await prisma.tag.findMany({
      include: { blogs: true },
    });
    res.status(200).json(tags);
  } catch (err) {
    console.error("Error while fetching tags:", err);
    res.status(400).json({
      error: "Error fetching tags",
      details: err.message,
    });
  }
});

// Update tags
app.put("/blogs/tags/:id", async (req, res) => {
  const { id } = req.params;
  const { name, blogIDs } = req.body;

  try {
    const updatedTag = await prisma.tag.update({
      where: { id },
      data: { name, blogIDs },
    });

    res.status(200).json(updatedTag);
  } catch (err) {
    console.error("Error while updating tag:", err);
    res.status(400).json({ error: "Error updating tag", details: err.message });
  }
});


// Delete a tag
app.delete("/blogs/tags/:id", async (req, res) => {
    const { id } = req.params;
  
    try {
      await prisma.tag.delete({
        where: { id },
      });
  
      res.status(204).send();
    } catch (err) {
      console.error("Error while deleting tag:", err);
      res
        .status(400)
        .json({ error: "Error deleting tag", details: err.message });
    }
  });
  



// start a server
app.listen(PORT, () => {
  console.log(`Server is running at ${PORT}`);
});