import { Db, Collection, ObjectId, Filter, UpdateFilter, Sort } from 'mongodb'
import { getMongoDb } from '#providers/mongodb_provider'

export abstract class BaseModel {
  static collectionName: string

  _id?: ObjectId
  createdAt?: Date
  updatedAt?: Date

  static getDb(): Db {
    return getMongoDb()
  }

  static getCollection(this: { collectionName: string; getDb(): Db }): Collection {
    return this.getDb().collection(this.collectionName)
  }

  static async find(this: { collectionName: string; getDb(): Db }, filter: Filter<any> = {}): Promise<any[]> {
    const collection = this.getDb().collection(this.collectionName)
    return collection.find(filter).toArray()
  }

  static async findById(this: { collectionName: string; getDb(): Db }, id: string | ObjectId): Promise<any | null> {
    const collection = this.getDb().collection(this.collectionName)
    const objectId = typeof id === 'string' ? new ObjectId(id) : id
    return collection.findOne({ _id: objectId })
  }

  static async findOne(this: { collectionName: string; getDb(): Db }, filter: Filter<any>): Promise<any | null> {
    const collection = this.getDb().collection(this.collectionName)
    return collection.findOne(filter)
  }

  static async create(this: { collectionName: string; getDb(): Db }, data: Partial<any>): Promise<any> {
    const collection = this.getDb().collection(this.collectionName)
    const now = new Date()
    const doc = { ...data, createdAt: now, updatedAt: now }
    const result = await collection.insertOne(doc)
    return { ...doc, _id: result.insertedId }
  }

  static async createMany(this: { collectionName: string; getDb(): Db }, data: Partial<any>[]): Promise<any[]> {
    const collection = this.getDb().collection(this.collectionName)
    const now = new Date()
    const docs = data.map((d) => ({ ...d, createdAt: now, updatedAt: now }))
    const result = await collection.insertMany(docs)
    return docs.map((doc, i) => ({ ...doc, _id: result.insertedIds[i] }))
  }

  static async updateOne(
    this: { collectionName: string; getDb(): Db },
    filter: Filter<any>,
    update: UpdateFilter<any> | Partial<any>
  ): Promise<any> {
    const collection = this.getDb().collection(this.collectionName)
    const updateDoc = '$set' in update ? update : { $set: { ...update, updatedAt: new Date() } }
    return collection.updateOne(filter, updateDoc)
  }

  static async updateMany(
    this: { collectionName: string; getDb(): Db },
    filter: Filter<any>,
    update: UpdateFilter<any> | Partial<any>
  ): Promise<any> {
    const collection = this.getDb().collection(this.collectionName)
    const updateDoc = '$set' in update ? update : { $set: { ...update, updatedAt: new Date() } }
    return collection.updateMany(filter, updateDoc)
  }

  static async deleteOne(this: { collectionName: string; getDb(): Db }, filter: Filter<any>): Promise<boolean> {
    const collection = this.getDb().collection(this.collectionName)
    const result = await collection.deleteOne(filter)
    return result.deletedCount === 1
  }

  static async deleteMany(this: { collectionName: string; getDb(): Db }, filter: Filter<any>): Promise<number> {
    const collection = this.getDb().collection(this.collectionName)
    const result = await collection.deleteMany(filter)
    return result.deletedCount
  }

  static async paginate(
    this: { collectionName: string; getDb(): Db },
    page: number,
    perPage: number,
    filter: Filter<any> = {},
    sort: Sort = {}
  ): Promise<{ data: any[]; total: number; page: number; perPage: number; lastPage: number }> {
    const collection = this.getDb().collection(this.collectionName)
    const total = await collection.countDocuments(filter)
    const lastPage = Math.max(1, Math.ceil(total / perPage))
    const skip = (page - 1) * perPage
    const data = await collection.find(filter).sort(sort).skip(skip).limit(perPage).toArray()
    return { data, total, page, perPage, lastPage }
  }

  static query(this: { collectionName: string; getDb(): Db }) {
    const collection = this.getDb().collection(this.collectionName)
    return collection
  }

  async save(): Promise<void> {
    const constructor = this.constructor as typeof BaseModel
    const collection = constructor.getDb().collection(constructor.collectionName)
    this.updatedAt = new Date()
    if (!this.createdAt) {
      this.createdAt = new Date()
    }
    const { _id, ...data } = this as any
    if (_id) {
      await collection.updateOne({ _id }, { $set: data })
    } else {
      const result = await collection.insertOne(data)
      this._id = result.insertedId
    }
  }

  async delete(): Promise<boolean> {
    const constructor = this.constructor as typeof BaseModel
    const collection = constructor.getDb().collection(constructor.collectionName)
    if (!this._id) return false
    const result = await collection.deleteOne({ _id: this._id })
    return result.deletedCount === 1
  }

  async refresh(): Promise<void> {
    const constructor = this.constructor as typeof BaseModel
    const collection = constructor.getDb().collection(constructor.collectionName)
    if (!this._id) return
    const doc = await collection.findOne({ _id: this._id })
    if (doc) {
      Object.assign(this, doc)
    }
  }
}