import { CaseConvention, convertCase } from './case'
import { Deserializer } from './de'
import { Serializer } from './ser'
import { isFunction, isNumber, isString } from './utils'
import { GlobalRegistry, Registry } from './registry'


export interface RenameOptions {
  serialize?: string
  deserialize?: string
}

export interface RenameAllOptions {
  serialize?: CaseConvention
  deserialize?: CaseConvention
}

export interface ContainerOptions {
  // deserialization only
  default?: () => any
  // deserialization only
  denyUnknownFields?: boolean
  expecting?: string
  rename?: RenameOptions | string
  renameAll?: RenameAllOptions | CaseConvention
  registry?: Registry
  tag?: string
  content?: string
  untagged?: boolean
}

export interface ConditionalSkipOptions {
  if: (value: any) => boolean
}

export interface SkipOptions {
  serializing?: ConditionalSkipOptions | boolean
  deserializing?: ConditionalSkipOptions | boolean
}

export type CustomSerializer = <T, V, S extends Serializer<T>>(value: V, serializer: S) => T
export type CustomDeserializer = <T, D extends Deserializer>(deserializer: D) => T

export interface PropertyOptions {
  alias?: string
  // deserialization only
  default?: () => any
  flatten?: boolean
  rename?: RenameOptions | string
  //serializeWith?: CustomSerializer
  //deserializeWith: CustomDeserializer
  skip?: SkipOptions | ConditionalSkipOptions | boolean
}

export const Stage = Object.freeze({
  Serialize: 0,
  Deserialize: 1
} as const)

export type Stage = typeof Stage[keyof typeof Stage]

export class SerdeOptions {
  target: any
  readonly options: ContainerOptions
  readonly properties: Map<string, PropertyOptions>

  get registry() {
    return this.options.registry || GlobalRegistry
  }

  constructor(options: ContainerOptions = {}, properties: Map<string, PropertyOptions> = new Map()) {
    this.options = options
    this.properties = properties
  }

  static from(target: any) {
    return new this(target)
  }

  getClassName(stage: Stage) {
    if (isString(this.options.rename)) {
      return this.options.rename
    } else if (stage === Stage.Serialize && isString(this.options.rename?.serialize)) {
      return this.options.rename.serialize
    } else if (stage === Stage.Deserialize && isString(this.options.rename?.deserialize)) {
      return this.options.rename.deserialize
    } else {
      return this.target.constructor.name
    }
  }

  private getPropertyRename(property: string, stage: Stage, options: PropertyOptions) {
    if (options != null) {
      if (isString(options.rename)) {
        return options.rename
      } else if (stage === Stage.Serialize && isString(options.rename?.serialize)) {
        return options.rename.serialize
      } else if (stage === Stage.Deserialize && isString(options.rename?.deserialize)) {
        return options.rename.deserialize
      }
    }

    return property
  }

  private getPropertyCase(name: string, stage: Stage) {
    if (isNumber(this.options.renameAll)) {
      return convertCase(name, this.options.renameAll)
    } else if (stage === Stage.Serialize && isNumber(this.options.renameAll?.serialize)) {
      return convertCase(name, this.options.renameAll.serialize)
    } else if (stage === Stage.Deserialize && isNumber(this.options.renameAll?.deserialize)) {
      return convertCase(name, this.options.renameAll.deserialize)
    } else {
      return name
    }
  }

  getPropertyName(property: string, stage: Stage) {
    const options = this.properties.get(property)
    const name = options != null ? this.getPropertyRename(property, stage, options) : property
    return this.getPropertyCase(name, stage)
  }

  getSerializationName(property: string) {
    return this.getPropertyName(property, Stage.Serialize)
  }

  getDeserializationName(property: string) {
    return this.getPropertyName(property, Stage.Deserialize)
  }

  getDefault(property: string) {
    const options = this.properties.get(property)
    if (options && isFunction(options.default)) {
      return options.default()
    } else if (isFunction(this.options.default)) {
      return this.options.default()
    }
  }

  //getCustomImpl(property: string, stage: Stage) {
  //  const options = this.properties.get(property)
  //  if (options != null) {
  //    if (stage === Stage.Serialize && isFunction(options.serializeWith)) {
  //      return options.serializeWith
  //    } else if (stage === Stage.Deserialize && isFunction(options.deserializeWith)) {
  //      return options.deserializeWith
  //    }
  //  }
  //}

  //getSerializer(property: string): Nullable<CustomSerializer> {
  //  return this.getCustomImpl(property, Stage.Serialize) as CustomSerializer
  //}

  //getDeserializer(property: string): Nullable<CustomDeserializer> {
  //  return this.getCustomImpl(property, Stage.Deserialize) as CustomDeserializer
  //}

  private isConditionalSkip(skip: any): skip is ConditionalSkipOptions {
    return 'if' in skip && isFunction(skip.if)
  }

  shouldSkip(property: string, value: any, stage: Stage): boolean {
    const options = this.properties.get(property)
    if (options != null && options.skip != null) {
      if (typeof options.skip === 'boolean') {
        return options.skip
      } else if (this.isConditionalSkip(options.skip)) {
        return options.skip.if(value)
      } else if (stage === Stage.Serialize && typeof options.skip.serializing === 'boolean') {
        return options.skip.serializing
      } else if (stage === Stage.Serialize && this.isConditionalSkip(options.skip.serializing)) {
        return options.skip.serializing.if(value)
      } else if (stage === Stage.Deserialize && typeof options.skip.deserializing === 'boolean') {
        return options.skip.deserializing
      } else if (stage === Stage.Deserialize && this.isConditionalSkip(options.skip.deserializing)) {
        return options.skip.deserializing.if(value)
      }
    }
    return false
  }

  shouldSkipSerializing(property: string, value: any): boolean {
    return this.shouldSkip(property, value, Stage.Serialize)
  }

  shouldSkipDeserializing(property: string, value: any): boolean {
    return this.shouldSkip(property, value, Stage.Deserialize)
  }
}