// Ths contents of this file are taken from https://github.com/shurcooL/graphql/blob/ed46e5a4646634fc16cb07c3b8db389542cc8847/query.go
// because they are not exported by the module, and we would like to use them in building the githubv4mock test utility.
//
// The original license, copied from https://github.com/shurcooL/graphql/blob/ed46e5a4646634fc16cb07c3b8db389542cc8847/LICENSE
//
// MIT License

// Copyright (c) 2017 Dmitri Shuralyov

// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:

// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
package githubv4mock

import (
	"bytes"
	"encoding/json"
	"io"
	"reflect"
	"sort"

	"github.com/shurcooL/graphql/ident"
)

func constructQuery(v any, variables map[string]any) string {
	query := query(v)
	if len(variables) > 0 {
		return "query(" + queryArguments(variables) + ")" + query
	}
	return query
}

func constructMutation(v any, variables map[string]any) string {
	query := query(v)
	if len(variables) > 0 {
		return "mutation(" + queryArguments(variables) + ")" + query
	}
	return "mutation" + query
}

// queryArguments constructs a minified arguments string for variables.
//
// E.g., map[string]any{"a": Int(123), "b": NewBoolean(true)} -> "$a:Int!$b:Boolean".
func queryArguments(variables map[string]any) string {
	// Sort keys in order to produce deterministic output for testing purposes.
	// TODO: If tests can be made to work with non-deterministic output, then no need to sort.
	keys := make([]string, 0, len(variables))
	for k := range variables {
		keys = append(keys, k)
	}
	sort.Strings(keys)

	var buf bytes.Buffer
	for _, k := range keys {
		_, _ = io.WriteString(&buf, "$")
		_, _ = io.WriteString(&buf, k)
		_, _ = io.WriteString(&buf, ":")
		writeArgumentType(&buf, reflect.TypeOf(variables[k]), true)
		// Don't insert a comma here.
		// Commas in GraphQL are insignificant, and we want minified output.
		// See https://spec.graphql.org/October2021/#sec-Insignificant-Commas.
	}
	return buf.String()
}

// writeArgumentType writes a minified GraphQL type for t to w.
// value indicates whether t is a value (required) type or pointer (optional) type.
// If value is true, then "!" is written at the end of t.
func writeArgumentType(w io.Writer, t reflect.Type, value bool) {
	if t.Kind() == reflect.Ptr {
		// Pointer is an optional type, so no "!" at the end of the pointer's underlying type.
		writeArgumentType(w, t.Elem(), false)
		return
	}

	switch t.Kind() {
	case reflect.Slice, reflect.Array:
		// List. E.g., "[Int]".
		_, _ = io.WriteString(w, "[")
		writeArgumentType(w, t.Elem(), true)
		_, _ = io.WriteString(w, "]")
	default:
		// Named type. E.g., "Int".
		name := t.Name()
		if name == "string" { // HACK: Workaround for https://github.com/shurcooL/githubv4/issues/12.
			name = "ID"
		}
		_, _ = io.WriteString(w, name)
	}

	if value {
		// Value is a required type, so add "!" to the end.
		_, _ = io.WriteString(w, "!")
	}
}

// query uses writeQuery to recursively construct
// a minified query string from the provided struct v.
//
// E.g., struct{Foo Int, BarBaz *Boolean} -> "{foo,barBaz}".
func query(v any) string {
	var buf bytes.Buffer
	writeQuery(&buf, reflect.TypeOf(v), false)
	return buf.String()
}

// writeQuery writes a minified query for t to w.
// If inline is true, the struct fields of t are inlined into parent struct.
func writeQuery(w io.Writer, t reflect.Type, inline bool) {
	switch t.Kind() {
	case reflect.Ptr, reflect.Slice:
		writeQuery(w, t.Elem(), false)
	case reflect.Struct:
		// If the type implements json.Unmarshaler, it's a scalar. Don't expand it.
		if reflect.PointerTo(t).Implements(jsonUnmarshaler) {
			return
		}
		if !inline {
			_, _ = io.WriteString(w, "{")
		}
		for i := 0; i < t.NumField(); i++ {
			if i != 0 {
				_, _ = io.WriteString(w, ",")
			}
			f := t.Field(i)
			value, ok := f.Tag.Lookup("graphql")
			inlineField := f.Anonymous && !ok
			if !inlineField {
				if ok {
					_, _ = io.WriteString(w, value)
				} else {
					_, _ = io.WriteString(w, ident.ParseMixedCaps(f.Name).ToLowerCamelCase())
				}
			}
			writeQuery(w, f.Type, inlineField)
		}
		if !inline {
			_, _ = io.WriteString(w, "}")
		}
	}
}

var jsonUnmarshaler = reflect.TypeOf((*json.Unmarshaler)(nil)).Elem()