package godis

import (
	"github.com/hdt3213/godis/interface/redis"
	"github.com/hdt3213/godis/redis/reply"
	"strings"
)

func execNormalCommand(db *DB, cmdArgs [][]byte) redis.Reply {
	cmdName := strings.ToLower(string(cmdArgs[0]))
	cmd, ok := cmdTable[cmdName]
	if !ok {
		return reply.MakeErrReply("ERR unknown command '" + cmdName + "'")
	}
	if !validateArity(cmd.arity, cmdArgs) {
		return reply.MakeArgNumErrReply(cmdName)
	}

	prepare := cmd.prepare
	write, read := prepare(cmdArgs[1:])
	db.addVersion(write...)
	db.RWLocks(write, read)
	defer db.RWUnLocks(write, read)
	fun := cmd.executor
	return fun(db, cmdArgs[1:])
}

// ExecWithLock executes normal commands, invoker should provide locks
func (db *DB) ExecWithLock(cmdLine [][]byte) redis.Reply {
	cmdName := strings.ToLower(string(cmdLine[0]))
	cmd, ok := cmdTable[cmdName]
	if !ok {
		return reply.MakeErrReply("ERR unknown command '" + cmdName + "'")
	}
	if !validateArity(cmd.arity, cmdLine) {
		return reply.MakeArgNumErrReply(cmdName)
	}
	fun := cmd.executor
	return fun(db, cmdLine[1:])
}

// GetRelatedKeys analysis related keys
func (db *DB) GetRelatedKeys(cmdLine [][]byte) ([]string, []string) {
	cmdName := strings.ToLower(string(cmdLine[0]))
	cmd, ok := cmdTable[cmdName]
	if !ok {
		return nil, nil
	}
	prepare := cmd.prepare
	if prepare == nil {
		return nil, nil
	}
	return prepare(cmdLine[1:])
}

// GetUndoLogs return rollback commands
func (db *DB) GetUndoLogs(cmdLine [][]byte) []CmdLine {
	cmdName := strings.ToLower(string(cmdLine[0]))
	cmd, ok := cmdTable[cmdName]
	if !ok {
		return nil
	}
	undo := cmd.undo
	if undo == nil {
		return nil
	}
	return undo(db, cmdLine[1:])
}