const prisma = require("../utils/prisma");

/**
 * @typedef {Object} DeptDocument
 * @property {number} id
 * @property {number} deptId
 * @property {string} realDocId
 * @property {string} filename
 * @property {string} docpath
 * @property {string} [metadata]
 * @property {string} [tag]
 * @property {string} realFilename
 * @property {boolean} public
 * @property {Date} createdAt
 * @property {Date} lastUpdatedAt
 */

const DeptDocument = {
  writable: [
    "deptId",
    "parsedFileName",
    "parsedFilePath",
    "realFileName",
    "realFileAlias",
    "realFilePath",
    "isPublic",
    "tags",
    "delTag",
  ],
  validations: {
    filename: (newValue = "") => {
      if (typeof newValue !== "string" || newValue.length > 255) {
        throw new Error(
          "Filename must be a string and cannot be longer than 255 characters"
        );
      }
      return newValue;
    },
    docpath: (newValue = "") => {
      if (typeof newValue !== "string" || newValue.length > 255) {
        throw new Error(
          "Document path must be a string and cannot be longer than 255 characters"
        );
      }
      return newValue;
    },
    public: (newValue = false) => {
      if (typeof newValue !== "boolean") {
        throw new Error("Public must be a boolean");
      }
      return newValue;
    },
  },
  castColumnValue: function (key, value) {
    switch (key) {
      case "public":
        return Boolean(value);
      default:
        return value;
    }
  },

  /**
   * 创建部门文档
   * @param {Object} data - 部门文档数据
   * @returns {Promise<{ deptDocument: DeptDocument | null, error: string | null }>}
   */
  create: async function (data) {
    try {
      const validatedData = {};
      for (const key of this.writable) {
        if (data[key] !== undefined) {
          if (this.validations[key]) {
            validatedData[key] = this.validations[key](data[key]);
          } else {
            validatedData[key] = this.castColumnValue(key, data[key]);
          }
        }
      }

      const deptDocument = await prisma.dept_document.create({
        data: {
          ...validatedData,
          createdAt: new Date(),
          lastUpdatedAt: new Date(),
        },
      });

      return { deptDocument, error: null };
    } catch (error) {
      console.error("FAILED TO CREATE DEPT DOCUMENT.", error.message);
      return { deptDocument: null, error: error.message };
    }
  },

  /**
   * 更新部门文档
   * @param {number} id - 文档 ID
   * @param {Object} updates - 更新的字段
   * @returns {Promise<{ success: boolean, error: string | null, deptDocument: DeptDocument | null }>}
   */
  update: async function (id, updates = {}) {
    try {
      if (!id) throw new Error("No document id provided for update");

      const currentDocument = await prisma.dept_document.findUnique({
        where: { id },
      });
      if (!currentDocument) throw new Error("Document not found");

      const validatedUpdates = {};
      for (const key of this.writable) {
        if (updates[key] !== undefined) {
          if (this.validations[key]) {
            validatedUpdates[key] = this.validations[key](updates[key]);
          } else {
            validatedUpdates[key] = this.castColumnValue(key, updates[key]);
          }
        }
      }

      validatedUpdates.lastUpdatedAt = new Date();

      const updatedDocument = await prisma.dept_document.update({
        where: { id },
        data: validatedUpdates,
      });

      return { success: true, error: null, deptDocument: updatedDocument };
    } catch (error) {
      console.error(error.message);
      return { success: false, error: error.message, deptDocument: null };
    }
  },

  /**
   * 获取部门文档
   * @param {Object} clause - 查询条件
   * @returns {Promise<{ deptDocument: DeptDocument | null }>}
   */
  get: async function (clause = {}) {
    try {
      const deptDocument = await prisma.dept_document.findFirst({
        where: clause,
      });
      return deptDocument ? { deptDocument } : null;
    } catch (error) {
      console.error(error.message);
      return null;
    }
  },

  /**
   * 删除部门文档
   * @param {Object} clause - 删除条件
   * @returns {Promise<boolean>}
   */
  delete: async function (clause = {}) {
    try {
      const affectedRows = await prisma.dept_document.deleteMany({
        where: clause,
      });
      return affectedRows.count > 0;
    } catch (error) {
      console.error(error.message);
      return false;
    }
  },

  /**
   * 查询部门文档列表
   * @param {Object} clause - 查询条件
   * @param {number} limit - 限制数量
   * @returns {Promise<DeptDocument[]>}
   */
  where: async function (clause = {}, limit = null) {
    try {
      const deptDocuments = await prisma.dept_document.findMany({
        where: clause,
        take: limit !== null ? limit : undefined,
      });
      return deptDocuments;
    } catch (error) {
      console.error(error.message);
      return [];
    }
  },

  /**
   * 检查文档路径是否唯一
   * @param {string} docpath - 文档路径
   * @returns {Promise<boolean>}
   */
  checkDocpathUnique: async function (docpath) {
    try {
      const existingDocument = await prisma.dept_document.findFirst({
        where: { docpath },
      });
      return !existingDocument;
    } catch (error) {
      console.error("检查文档路径唯一性失败:", error);
      throw error;
    }
  },

  /**
   * 检查文档是否属于指定部门
   * @param {number} id - 文档 ID
   * @param {number} deptId - 部门 ID
   * @returns {Promise<boolean>}
   */
  checkDocumentBelongsToDept: async function (id, deptId) {
    try {
      const document = await prisma.dept_document.findFirst({
        where: { id, deptId },
      });
      return !!document;
    } catch (error) {
      console.error("检查文档所属部门失败:", error);
      throw error;
    }
  },
};

module.exports = { DeptDocument };