/*
 * Copyright (C) 2020-2022, IrineSistiana
 *
 * This file is part of mosdns.
 *
 * mosdns is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * mosdns is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

package sequence

import (
	"context"
	"github.com/IrineSistiana/mosdns/v5/coremain"
	"github.com/IrineSistiana/mosdns/v5/pkg/query_context"
)

const PluginType = "sequence"

func init() {
	coremain.RegNewPluginFunc(PluginType, Init, func() any { return new(Args) })

	MustRegExecQuickSetup("accept", setupAccept)
	MustRegExecQuickSetup("reject", setupReject)
	MustRegExecQuickSetup("return", setupReturn)
	MustRegExecQuickSetup("goto", setupGoto)
	MustRegExecQuickSetup("jump", setupJump)
	MustRegMatchQuickSetup("_true", setupTrue) // add _ prefix to avoid being mis-parsed as bool
	MustRegMatchQuickSetup("_false", setupFalse)
}

type Sequence struct {
	chain            []*ChainNode
	anonymousPlugins []any
}

func (s *Sequence) Close() error {
	for _, plugin := range s.anonymousPlugins {
		closePlugin(plugin)
	}
	return nil
}

type Args = []RuleArgs

func Init(bp *coremain.BP, args any) (any, error) {
	return NewSequence(bp, *args.(*Args))
}

func NewSequence(bq BQ, ra []RuleArgs) (*Sequence, error) {
	s := &Sequence{}

	var rc []RuleConfig
	for _, ra := range ra {
		rc = append(rc, parseArgs(ra))
	}
	if err := s.buildChain(bq, rc); err != nil {
		_ = s.Close()
		return nil, err
	}
	return s, nil
}

func (s *Sequence) Exec(ctx context.Context, qCtx *query_context.Context) error {
	walker := NewChainWalker(s.chain, nil)
	return walker.ExecNext(ctx, qCtx)
}