const mongoose = require('../infrastructure/Mongoose')
const { Schema } = mongoose
const _ = require('lodash')

const MIN_NAME_LENGTH = 3
const MAX_NAME_LENGTH = 200
const MIN_VARIANT_NAME_LENGTH = 3
const MAX_VARIANT_NAME_LENGTH = 255
const NAME_REGEX = /^[a-zA-Z0-9\-_]+$/

const RolloutPercentType = {
  type: Number,
  default: 0,
  min: [0, 'Rollout percentage must be between 0 and 100, got {VALUE}'],
  max: [100, 'Rollout percentage must be between 0 and 100, got {VALUE}'],
  required: true,
}

const VariantSchema = new Schema(
  {
    name: {
      type: String,
      minLength: MIN_VARIANT_NAME_LENGTH,
      maxLength: MAX_VARIANT_NAME_LENGTH,
      required: true,
      validate: {
        validator: function (input) {
          return input !== null && input !== 'default' && NAME_REGEX.test(input)
        },
        message: `invalid, cannot be 'default' and must match: ${NAME_REGEX}, got {VALUE}`,
      },
    },
    active: {
      type: Boolean,
      default: true,
      required: true,
    },
    rolloutPercent: RolloutPercentType,
    rolloutStripes: [
      {
        start: RolloutPercentType,
        end: RolloutPercentType,
      },
    ],
  },
  { _id: false }
)

const VersionSchema = new Schema(
  {
    versionNumber: {
      type: Number,
      default: 1,
      min: [1, 'must be 1 or higher, got {VALUE}'],
      required: true,
    },
    phase: {
      type: String,
      default: 'alpha',
      enum: ['alpha', 'beta', 'release'],
      required: true,
    },
    active: {
      type: Boolean,
      default: true,
      required: true,
    },
    variants: [VariantSchema],
    createdAt: {
      type: Date,
      default: Date.now,
    },
  },
  { _id: false }
)

const SplitTestSchema = new Schema({
  name: {
    type: String,
    minLength: MIN_NAME_LENGTH,
    maxlength: MAX_NAME_LENGTH,
    required: true,
    unique: true,
    validate: {
      validator: function (input) {
        return input !== null && NAME_REGEX.test(input)
      },
      message: `invalid, must match: ${NAME_REGEX}`,
    },
  },
  versions: [VersionSchema],
  forbidReleasePhase: {
    type: Boolean,
    required: false,
  },
})

SplitTestSchema.methods.getCurrentVersion = function () {
  if (this.versions && this.versions.length > 0) {
    return _.maxBy(this.versions, 'versionNumber')
  } else {
    return undefined
  }
}

SplitTestSchema.methods.getVersion = function (versionNumber) {
  return _.find(this.versions || [], {
    versionNumber,
  })
}

module.exports = {
  SplitTest: mongoose.model('SplitTest', SplitTestSchema),
  SplitTestSchema,
}
