package dtmsvr

import (
	"fmt"

	"github.com/yedf/dtm/dtmcli"
	"gorm.io/gorm/clause"
)

func svcSubmit(t *TransGlobal) (interface{}, error) {
	db := dbGet()
	t.Status = dtmcli.StatusSubmitted
	err := t.saveNew(db)

	if err == errUniqueConflict {
		dbt := transFromDb(db, t.Gid)
		if dbt.Status == dtmcli.StatusPrepared {
			updates := t.setNextCron(cronReset)
			db.Must().Model(t).Where("gid=? and status=?", t.Gid, dtmcli.StatusPrepared).Select(append(updates, "status")).Updates(t)
		} else if dbt.Status != dtmcli.StatusSubmitted {
			return map[string]interface{}{"dtm_result": dtmcli.ResultFailure, "message": fmt.Sprintf("current status '%s', cannot sumbmit", dbt.Status)}, nil
		}
	}
	return t.Process(db), nil
}

func svcPrepare(t *TransGlobal) (interface{}, error) {
	t.Status = dtmcli.StatusPrepared
	err := t.saveNew(dbGet())
	if err == errUniqueConflict {
		dbt := transFromDb(dbGet(), t.Gid)
		if dbt.Status != dtmcli.StatusPrepared {
			return map[string]interface{}{"dtm_result": dtmcli.ResultFailure, "message": fmt.Sprintf("current status '%s', cannot prepare", dbt.Status)}, nil
		}
	}
	return dtmcli.MapSuccess, nil
}

func svcAbort(t *TransGlobal) (interface{}, error) {
	db := dbGet()
	dbt := transFromDb(db, t.Gid)
	if t.TransType != "xa" && t.TransType != "tcc" || dbt.Status != dtmcli.StatusPrepared && dbt.Status != dtmcli.StatusAborting {
		return map[string]interface{}{"dtm_result": dtmcli.ResultFailure, "message": fmt.Sprintf("trans type: '%s' current status '%s', cannot abort", dbt.TransType, dbt.Status)}, nil
	}
	dbt.changeStatus(db, dtmcli.StatusAborting)
	return dbt.Process(db), nil
}

func svcRegisterBranch(branch *TransBranch, data map[string]string) (interface{}, error) {
	db := dbGet()
	dbt := transFromDb(db, branch.Gid)
	if dbt.Status != dtmcli.StatusPrepared {
		return map[string]interface{}{"dtm_result": dtmcli.ResultFailure, "message": fmt.Sprintf("current status: %s cannot register branch", dbt.Status)}, nil
	}

	branches := []TransBranch{*branch, *branch}
	if dbt.TransType == "tcc" {
		for i, b := range []string{dtmcli.BranchCancel, dtmcli.BranchConfirm} {
			branches[i].Op = b
			branches[i].URL = data[b]
		}
	} else if dbt.TransType == "xa" {
		branches[0].Op = dtmcli.BranchRollback
		branches[0].URL = data["url"]
		branches[1].Op = dtmcli.BranchCommit
		branches[1].URL = data["url"]
	} else {
		return nil, fmt.Errorf("unknow trans type: %s", dbt.TransType)
	}

	db.Must().Clauses(clause.OnConflict{
		DoNothing: true,
	}).Create(branches)
	global := TransGlobal{Gid: branch.Gid}
	global.touch(dbGet(), cronKeep)
	return dtmcli.MapSuccess, nil
}