// SPDX-License-Identifier: Apache-2.0
//
// The OpenSearch Contributors require contributions made to
// this file be licensed under the Apache-2.0 license or a
// compatible open source license.
//
// Modifications Copyright OpenSearch Contributors. See
// GitHub history for details.

// Licensed to Elasticsearch B.V. under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. Elasticsearch B.V. 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 opensearchapi

import (
	"strconv"
	"strings"
)

// DocumentExplainParams represents possible parameters for the DocumentExplainReq
type DocumentExplainParams struct {
	Analyzer        string
	AnalyzeWildcard *bool
	DefaultOperator string
	Df              string
	Lenient         *bool
	Preference      string
	Query           string
	Routing         string
	Source          interface{}
	SourceExcludes  []string
	SourceIncludes  []string
	StoredFields    []string

	Pretty     bool
	Human      bool
	ErrorTrace bool
	FilterPath []string
}

func (r DocumentExplainParams) get() map[string]string {
	params := make(map[string]string)

	if r.Analyzer != "" {
		params["analyzer"] = r.Analyzer
	}

	if r.AnalyzeWildcard != nil {
		params["analyze_wildcard"] = strconv.FormatBool(*r.AnalyzeWildcard)
	}

	if r.DefaultOperator != "" {
		params["default_operator"] = r.DefaultOperator
	}

	if r.Df != "" {
		params["df"] = r.Df
	}

	if r.Lenient != nil {
		params["lenient"] = strconv.FormatBool(*r.Lenient)
	}

	if r.Preference != "" {
		params["preference"] = r.Preference
	}

	if r.Query != "" {
		params["q"] = r.Query
	}

	if r.Routing != "" {
		params["routing"] = r.Routing
	}

	switch source := r.Source.(type) {
	case bool:
		params["_source"] = strconv.FormatBool(source)
	case string:
		if source != "" {
			params["_source"] = source
		}
	case []string:
		if len(source) > 0 {
			params["_source"] = strings.Join(source, ",")
		}
	}

	if len(r.SourceExcludes) > 0 {
		params["_source_excludes"] = strings.Join(r.SourceExcludes, ",")
	}

	if len(r.SourceIncludes) > 0 {
		params["_source_includes"] = strings.Join(r.SourceIncludes, ",")
	}

	if len(r.StoredFields) > 0 {
		params["stored_fields"] = strings.Join(r.StoredFields, ",")
	}

	if r.Pretty {
		params["pretty"] = "true"
	}

	if r.Human {
		params["human"] = "true"
	}

	if r.ErrorTrace {
		params["error_trace"] = "true"
	}

	if len(r.FilterPath) > 0 {
		params["filter_path"] = strings.Join(r.FilterPath, ",")
	}

	return params
}