package metaquery

import (
	"strings"

	"github.com/c-bata/go-prompt"
)

// CompleterInput is a struct defining input data for the metaquery completer
type CompleterInput struct {
	Query            string
	TableSuggestions []prompt.Suggest
}

type completer func(input *CompleterInput) []prompt.Suggest

// Complete returns completions for metaqueries.
func Complete(input *CompleterInput) []prompt.Suggest {
	input.Query = strings.TrimSuffix(input.Query, ";")
	cmd, _ := getCmdAndArgs(input.Query)

	metaQueryObj, found := metaQueryDefinitions[cmd]
	if !found {
		return []prompt.Suggest{}
	}
	if metaQueryObj.completer == nil {
		return []prompt.Suggest{}
	}
	return metaQueryObj.completer(input)
}

func completerFromArgsOf(cmd string) completer {
	return func(input *CompleterInput) []prompt.Suggest {
		metaQueryDefinition := metaQueryDefinitions[cmd]
		suggestions := make([]prompt.Suggest, len(metaQueryDefinition.args))
		for idx, arg := range metaQueryDefinition.args {
			suggestions[idx] = prompt.Suggest{Text: arg.value, Description: arg.description, Output: arg.value}
		}
		return suggestions
	}
}

func inspectCompleter(input *CompleterInput) []prompt.Suggest {
	return input.TableSuggestions
}