/*
 * Copyright (c) 2021 yedf. All rights reserved.
 * Use of this source code is governed by a BSD-style
 * license that can be found in the LICENSE file.
 */

package dtmsvr

import (
	"errors"
	"strconv"
	"time"

	"github.com/dtm-labs/dtm/client/dtmcli"
	"github.com/dtm-labs/dtm/client/dtmcli/dtmimp"
	"github.com/dtm-labs/dtm/dtmutil"
	"github.com/gin-gonic/gin"
	"github.com/prometheus/client_golang/prometheus/promhttp"
)

func addRoute(engine *gin.Engine) {
	engine.GET("/api/dtmsvr/version", dtmutil.WrapHandler2(func(c *gin.Context) interface{} {
		return gin.H{"version": Version}
	}))
	engine.GET("/api/dtmsvr/newGid", dtmutil.WrapHandler2(newGid))
	engine.POST("/api/dtmsvr/prepare", dtmutil.WrapHandler2(prepare))
	engine.POST("/api/dtmsvr/submit", dtmutil.WrapHandler2(submit))
	engine.POST("/api/dtmsvr/abort", dtmutil.WrapHandler2(abort))
	engine.POST("/api/dtmsvr/forceStop", dtmutil.WrapHandler2(forceStop)) // change global status to failed can stop trigger (Use with caution in production environment)
	engine.POST("/api/dtmsvr/registerBranch", dtmutil.WrapHandler2(registerBranch))
	engine.POST("/api/dtmsvr/registerXaBranch", dtmutil.WrapHandler2(registerBranch))  // compatible for old sdk
	engine.POST("/api/dtmsvr/registerTccBranch", dtmutil.WrapHandler2(registerBranch)) // compatible for old sdk
	engine.POST("/api/dtmsvr/prepareWorkflow", dtmutil.WrapHandler2(prepareWorkflow))
	engine.GET("/api/dtmsvr/query", dtmutil.WrapHandler2(query))
	engine.GET("/api/dtmsvr/all", dtmutil.WrapHandler2(all))
	engine.GET("/api/dtmsvr/resetCronTime", dtmutil.WrapHandler2(resetCronTime))

	// add prometheus exporter
	h := promhttp.Handler()
	engine.GET("/api/metrics", func(c *gin.Context) {
		h.ServeHTTP(c.Writer, c.Request)
	})
}

//  NOTE: unique in storage, can customize the generation rules instead of using server-side generation, it will help with the tracking
func newGid(c *gin.Context) interface{} {
	return map[string]interface{}{"gid": GenGid(), "dtm_result": dtmcli.ResultSuccess}
}

func prepare(c *gin.Context) interface{} {
	return svcPrepare(TransFromContext(c))
}

func submit(c *gin.Context) interface{} {
	return svcSubmit(TransFromContext(c))
}

func abort(c *gin.Context) interface{} {
	return svcAbort(TransFromContext(c))
}

func forceStop(c *gin.Context) interface{} {
	return svcForceStop(TransFromContext(c))
}

func registerBranch(c *gin.Context) interface{} {
	data := map[string]string{}
	err := c.BindJSON(&data)
	e2p(err)
	branch := TransBranch{
		Gid:      dtmimp.Escape(data["gid"]),
		BranchID: data["branch_id"],
		Status:   dtmcli.StatusPrepared,
		BinData:  []byte(data["data"]),
	}
	return svcRegisterBranch(data["trans_type"], &branch, data)
}

func query(c *gin.Context) interface{} {
	gid := c.Query("gid")
	if gid == "" {
		return errors.New("no gid specified")
	}
	trans := GetStore().FindTransGlobalStore(gid)
	branches := GetStore().FindBranches(gid)
	return map[string]interface{}{"transaction": trans, "branches": branches}
}

func prepareWorkflow(c *gin.Context) interface{} {
	trans, branches, err := svcPrepareWorkflow(TransFromContext(c))
	if err != nil {
		return err
	}
	return map[string]interface{}{"Transaction": trans, "Progresses": branches}
}

func all(c *gin.Context) interface{} {
	position := c.Query("position")
	sLimit := dtmimp.OrString(c.Query("limit"), "100")
	globals := GetStore().ScanTransGlobalStores(&position, int64(dtmimp.MustAtoi(sLimit)))
	return map[string]interface{}{"transactions": globals, "next_position": position}
}

// unfinished transactions need to be retried as soon as possible after business downtime is recovered
func resetCronTime(c *gin.Context) interface{} {
	sTimeoutSecond := dtmimp.OrString(c.Query("timeout"), strconv.FormatInt(3*conf.TimeoutToFail, 10))
	sLimit := dtmimp.OrString(c.Query("limit"), "100")
	timeout := time.Duration(dtmimp.MustAtoi(sTimeoutSecond)) * time.Second

	succeedCount, hasRemaining, err := GetStore().ResetCronTime(timeout, int64(dtmimp.MustAtoi(sLimit)))
	if err != nil {
		return err
	}
	return map[string]interface{}{"has_remaining": hasRemaining, "succeed_count": succeedCount}
}