// Licensed to the LF AI & Data foundation under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package autoindex

import (
	"encoding/json"
	"strconv"
)

type BigDataIndexExtraParams struct {
	PGCodeBudgetGBRatio      float64
	BuildNumThreadsRatio     float64
	SearchCacheBudgetGBRatio float64
	LoadNumThreadRatio       float64
	BeamWidthRatio           float64
}

const (
	BuildRatioKey     = "build_ratio"
	PrepareRatioKey   = "prepare_ratio"
	BeamWidthRatioKey = "beamwidth_ratio"
)

func NewBigDataIndexExtraParams() *BigDataIndexExtraParams {
	ret := &BigDataIndexExtraParams{
		PGCodeBudgetGBRatio:      0.125,
		BuildNumThreadsRatio:     1.0,
		SearchCacheBudgetGBRatio: 0.125,
		LoadNumThreadRatio:       8.0,
		BeamWidthRatio:           4.0,
	}
	return ret
}

func NewBigDataExtraParamsFromJSON(jsonStr string) *BigDataIndexExtraParams {
	buffer := make(map[string]string)
	err := json.Unmarshal([]byte(jsonStr), &buffer)
	if err != nil {
		return NewBigDataIndexExtraParams()
	}
	return NewBigDataExtraParamsFromMap(buffer)
}

func NewBigDataExtraParamsFromMap(value map[string]string) *BigDataIndexExtraParams {
	ret := &BigDataIndexExtraParams{}
	var err error
	buildRatio, ok := value[BuildRatioKey]
	if !ok {
		ret.PGCodeBudgetGBRatio = 0.125
		ret.BuildNumThreadsRatio = 1.0
	} else {
		valueMap1 := make(map[string]float64)
		err = json.Unmarshal([]byte(buildRatio), &valueMap1)
		if err != nil {
			ret.PGCodeBudgetGBRatio = 0.125
			ret.BuildNumThreadsRatio = 1.0
		} else {
			ret.PGCodeBudgetGBRatio = valueMap1["pg_code_budget_gb"]
			ret.BuildNumThreadsRatio = valueMap1["num_threads"]
		}
	}

	prepareRatio, ok := value[PrepareRatioKey]
	if !ok {
		ret.SearchCacheBudgetGBRatio = 0.125
		ret.LoadNumThreadRatio = 8
	} else {
		valueMap2 := make(map[string]float64)
		err = json.Unmarshal([]byte(prepareRatio), &valueMap2)
		if err != nil {
			ret.SearchCacheBudgetGBRatio = 0.125
			ret.LoadNumThreadRatio = 8
		} else {
			SearchCacheBudgetGBRatio, ok := valueMap2["search_cache_budget_gb"]
			if !ok {
				ret.SearchCacheBudgetGBRatio = 0.125
			} else {
				ret.SearchCacheBudgetGBRatio = SearchCacheBudgetGBRatio
			}
			LoadNumThreadRatio, ok := valueMap2["num_threads"]
			if !ok {
				ret.LoadNumThreadRatio = 8
			} else {
				ret.LoadNumThreadRatio = LoadNumThreadRatio
			}
		}
	}
	beamWidthRatioStr, ok := value[BeamWidthRatioKey]
	if !ok {
		ret.BeamWidthRatio = 4.0
	} else {
		beamWidthRatio, err := strconv.ParseFloat(beamWidthRatioStr, 64)
		if err != nil {
			ret.BeamWidthRatio = 4.0
		} else {
			ret.BeamWidthRatio = beamWidthRatio
		}
	}
	return ret
}