import response from "../../response.js";
import models from "../../models/index.js";
import {
  clearFileBuffers,
  saveFileToDisk,
} from "../../middlewares/Level/uploadLevel.js";
import fs from "fs";
import path from "path";
import {
  updateOtherLevelsRoutes,
  updateOtherLevelsRoutesOnDelete,
} from "../../middlewares/Level/checkLevel.js";

export const getLevels = async (req, res) => {
  try {
    const levels = await models.Level.findAll({
      attributes: {
        exclude: [
          "ROUTE_1",
          "ROUTE_2",
          "ROUTE_3",
          "ROUTE_4",
          "ROUTE_5",
          "ROUTE_6",
        ],
      },
    });

    response(200, levels, "Success", res);
  } catch (error) {
    console.log(error);
    res.status(500).json({ message: "Internal Server Error" });
  }
};

export const getLevelById = async (req, res) => {
  try {
    const { id } = req.params;
    const level = await models.Level.findByPk(id, {
      attributes: {
        exclude: [
          "ROUTE_1",
          "ROUTE_2",
          "ROUTE_3",
          "ROUTE_4",
          "ROUTE_5",
          "ROUTE_6",
        ],
      },
    });

    if (!level) {
      return response(404, null, "Level not found", res);
    }

    response(200, level, "Success", res);
  } catch (error) {
    console.log(error);
    res.status(500).json({ message: "Internal Server Error" });
  }
};

export const createLevel = async (req, res, next) => {
  const { NAME_LEVEL, ID_SECTION, ID_TOPIC, CONTENT } = req.body;
  const { video, image, audio } = req.filesToSave || {};

  if (!NAME_LEVEL) {
    clearFileBuffers({ video, image, audio });
    return response(400, null, "Level name is required", res);
  }

  if (!ID_SECTION) {
    clearFileBuffers({ video, image, audio });
    return response(400, null, "Section is required", res);
  }

  if (!ID_TOPIC) {
    clearFileBuffers({ video, image, audio });
    return response(400, null, "Topic is required", res);
  }

  try {
    const sectionWithTopic = await models.Topic.findOne({
      where: { ID_SECTION, ID_TOPIC },
    });

    if (!sectionWithTopic) {
      clearFileBuffers({ video, image, audio });
      return response(
        400,
        null,
        "Topic does not relate to the provided Section!",
        res
      );
    }

    const existingLevel = await models.Level.findOne({
      where: { NAME_LEVEL, ID_TOPIC },
    });

    if (existingLevel) {
      clearFileBuffers({ video, image, audio });
      return response(
        409,
        null,
        "A level with this name already exists under this topic",
        res
      );
    }

    const newLevel = await models.Level.create({
      NAME_LEVEL,
      ID_SECTION,
      ID_TOPIC,
      IS_PRETEST: req.body.IS_PRETEST || 0,
      CONTENT,
      VIDEO: null,
      AUDIO: null,
      IMAGE: null,
      ROUTE_1: req.body.ROUTE_1,
      ROUTE_2: req.body.ROUTE_2,
      ROUTE_3: req.body.ROUTE_3,
      ROUTE_4: req.body.ROUTE_4,
      ROUTE_5: req.body.ROUTE_5,
      ROUTE_6: req.body.ROUTE_6,
    });

    req.body.newLevelId = newLevel.ID_LEVEL;

    const videoFilename = video
      ? saveFileToDisk(video, "video", ID_TOPIC, ID_SECTION, newLevel.ID_LEVEL)
      : null;
    const audioFilename = audio
      ? saveFileToDisk(audio, "audio", ID_TOPIC, ID_SECTION, newLevel.ID_LEVEL)
      : null;
    const imageFilename = image
      ? saveFileToDisk(image, "image", ID_TOPIC, ID_SECTION, newLevel.ID_LEVEL)
      : null;

    newLevel.VIDEO = videoFilename;
    newLevel.AUDIO = audioFilename;
    newLevel.IMAGE = imageFilename;
    await newLevel.save();

    await updateOtherLevelsRoutes(req, res, next);

    response(201, newLevel, "Level created successfully", res);
  } catch (error) {
    console.log(error);
    clearFileBuffers({ video, image, audio });
    return response(500, null, "Internal Server Error", res);
  }
};

export const updateLevelById = async (req, res, next) => {
  const { id } = req.params;
  const { NAME_LEVEL, ID_SECTION, ID_TOPIC, CONTENT } = req.body;

  const { video, image, audio } = req.filesToSave || {};

  try {
    const level = await models.Level.findByPk(id);

    if (!level) {
      clearFileBuffers({ video, image, audio });
      return response(404, null, "Level not found", res);
    }

    const sectionWithTopic = await models.Topic.findOne({
      where: { ID_SECTION, ID_TOPIC },
    });

    if (!sectionWithTopic) {
      clearFileBuffers({ video, image, audio });
      return response(
        400,
        null,
        "Topic does not relate to the provided Section",
        res
      );
    }

    if (NAME_LEVEL && ID_TOPIC) {
      const existingLevel = await models.Level.findOne({
        where: {
          NAME_LEVEL,
          ID_TOPIC,
          ID_LEVEL: { [models.Sequelize.Op.ne]: id },
        },
      });

      if (existingLevel) {
        clearFileBuffers({ video, image, audio });
        return response(
          409,
          null,
          "A level with this name already exists under this topic",
          res
        );
      }
    }

    if (NAME_LEVEL) {
      level.NAME_LEVEL = NAME_LEVEL;
      if (NAME_LEVEL === "Level 1") {
        level.IS_PRETEST = 1;
      } else {
        level.IS_PRETEST = 0;
      }
    }
    if (ID_SECTION) level.ID_SECTION = ID_SECTION;
    if (ID_TOPIC) level.ID_TOPIC = ID_TOPIC;
    if (CONTENT) level.CONTENT = CONTENT;

    if (video) {
      if (level.VIDEO) {
        const oldVideoPath = path.join(
          "public/uploads/level/video",
          level.VIDEO
        );
        if (fs.existsSync(oldVideoPath)) {
          fs.unlinkSync(oldVideoPath);
        }
      }
      level.VIDEO = saveFileToDisk(
        video,
        "video",
        ID_TOPIC || level.ID_TOPIC,
        ID_SECTION || level.ID_SECTION,
        level.ID_LEVEL
      );
    }

    if (audio) {
      if (level.AUDIO) {
        const oldAudioPath = path.join(
          "public/uploads/level/audio",
          level.AUDIO
        );
        if (fs.existsSync(oldAudioPath)) {
          fs.unlinkSync(oldAudioPath);
        }
      }
      level.AUDIO = saveFileToDisk(
        audio,
        "audio",
        ID_TOPIC || level.ID_TOPIC,
        ID_SECTION || level.ID_SECTION,
        level.ID_LEVEL
      );
    }

    if (image) {
      if (level.IMAGE) {
        const oldImagePath = path.join(
          "public/uploads/level/image",
          level.IMAGE
        );
        if (fs.existsSync(oldImagePath)) {
          fs.unlinkSync(oldImagePath);
        }
      }
      level.IMAGE = saveFileToDisk(
        image,
        "image",
        ID_TOPIC || level.ID_TOPIC,
        ID_SECTION || level.ID_SECTION,
        level.ID_LEVEL
      );
    }

    await level.save();

    req.body.newLevelId = level.ID_LEVEL;

    await updateOtherLevelsRoutes(req, res, next);

    response(200, level, "Level updated successfully", res);
  } catch (error) {
    console.log(error);
    clearFileBuffers({ video, image, audio });
    return response(500, null, "Internal Server Error", res);
  }
};

export const deleteLevelById = async (req, res, next) => {
  const { id } = req.params;

  try {
    const level = await models.Level.findByPk(id);

    if (!level) {
      return response(404, null, "Level not found", res);
    }

    const deleteFile = (filePath) => {
      if (fs.existsSync(filePath)) {
        fs.unlinkSync(filePath);
      }
    };

    if (level.VIDEO) {
      const videoPath = path.join("public/uploads/level/video", level.VIDEO);
      deleteFile(videoPath);
    }

    if (level.AUDIO) {
      const audioPath = path.join("public/uploads/level/audio", level.AUDIO);
      deleteFile(audioPath);
    }

    if (level.IMAGE) {
      const imagePath = path.join("public/uploads/level/image", level.IMAGE);
      deleteFile(imagePath);
    }

    req.body.newLevelId = level.ID_LEVEL;

    await level.destroy();

    await updateOtherLevelsRoutesOnDelete(req, res, next);

    response(200, null, "Level deleted successfully", res);
  } catch (error) {
    console.log(error);
    return response(500, null, "Internal Server Error", res);
  }
};

export const unlockPreviousRoutes = async (req, res) => {
  const { NEXT_LEARNING } = req.params;
};