package containers

import (
	"debug/elf"
	"fmt"
	"math/rand"
	"sort"
	"strconv"
	"time"

	"github.com/coroot/coroot-node-agent/ebpftracer"
	"github.com/coroot/coroot-node-agent/ebpftracer/l7"
	"github.com/coroot/coroot-node-agent/ebpftracer/tracer"
	"github.com/coroot/coroot-node-agent/tracing"
	"github.com/coroot/coroot-node-agent/utils"
	"github.com/pkg/errors"
	"inet.af/netaddr"
)

func (c *Container) getTrace(traceId uint64) (*tracing.Trace, bool) {
	trace, ok := c.traceMap[traceId]
	return trace, ok
}

func (c *Container) InitTrace(traceId uint64, r *l7.RequestData) error {
	method, path, hostIp, port := l7.ParseHttpHost(r.Payload)
	ip, err := netaddr.ParseIP(hostIp)
	if err != nil {
		return fmt.Errorf("host ip error")
	}
	addr := netaddr.IPPortFrom(ip, port)
	trace := tracing.NewTrace(string(c.id), addr)
	if trace == nil {
		return fmt.Errorf("OTEL_EXPORTER_OTLP_TRACES_ENDPOINT is null")
	}
	c.traceMap[traceId] = trace

	trace.TraceStart(method, path, r.Status, r.Duration)
	return nil
}

func (c *Container) onL7RequestApm(pid uint32, fd uint64, timestamp uint64, r *l7.RequestData) map[netaddr.IP]string {
	c.lock.Lock()
	defer c.lock.Unlock()
	if r.Protocol == l7.ProtocolDNS {
		return c.onDNSRequest(r)
	}

	if r.Protocol == l7.ProtocolTrace {
		//fmt.Println("r.TraceStart:", r.TraceStart)
		//fmt.Println("r.TraceEnd:", r.TraceEnd)

		if r.TraceStart == 1 {
			//fmt.Println("====ProtocolTrace start1====", r.TraceId)
			err := c.InitTrace(r.TraceId, r)
			if err != nil {
				fmt.Println(err)
			}
			//fmt.Println("init r.TraceId:", r.TraceId)
			//trace, _ := c.getTrace(r.TraceId)
			//fmt.Println("init traceId", trace)
			//stats.observe(r.Status.Http(), "", r.Duration)
			//method, path := l7.ParseHttp(r.Payload)
			//fmt.Println("r.Payload:", string(r.Payload))
			//fmt.Println("method:", method)
			//fmt.Println("path:", path)
			//fmt.Println("====ProtocolTrace start2====")
			return nil
		}
		if r.TraceEnd == 1 {
			//fmt.Println("r:", r)
			//fmt.Println("r.Payload:", string(r.Payload))
			//fmt.Println("====ProtocolTrace end2====")
			trace, ok := c.getTrace(r.TraceId)
			if ok {
				trace.TraceEnd(r)
				delete(c.traceMap, r.TraceId)
			}
			//fmt.Println("====ProtocolTrace end1====", ok, r.TraceId)
			return nil
		}
	}
	if r.Protocol == l7.ProtocolHTTP {
		//stats.observe(r.Status.Http(), "", r.Duration)
		method, path, hostIp, port := l7.ParseHttpHost(r.Payload)
		//trace.HttpRequest(method, path, r.Status, r.Duration)

		apmTrace, ok := c.getTrace(r.TraceId)
		if ok {
			apmTrace.HttpTraceRequest(method, path, hostIp, port, r)
		}
		return nil
	}
	conn := c.connectionsByPidFd[PidFd{Pid: pid, Fd: fd}]
	//fmt.Println("l7.connectionsByPidFd", conn, pid, fd)

	if conn == nil {
		return nil
	}
	if timestamp != 0 && conn.Timestamp != timestamp {
		return nil
	}
	stats := c.l7Stats.get(r.Protocol, conn.Dest, conn.ActualDest)
	trace := tracing.NewTrace(string(c.id), conn.ActualDest)
	switch r.Protocol {
	case l7.ProtocolHTTP:
		fmt.Println("l7.ProtocolHTTP", r.TraceId)
		//stats.observe(r.Status.Http(), "", r.Duration)
		method, path, hostIp, port := l7.ParseHttpHost(r.Payload)
		//trace.HttpRequest(method, path, r.Status, r.Duration)

		apmTrace, ok := c.getTrace(r.TraceId)
		if ok {
			apmTrace.HttpTraceRequest(method, path, hostIp, port, r)
		}

	case l7.ProtocolHTTP2:
		if conn.http2Parser == nil {
			conn.http2Parser = l7.NewHttp2Parser()
		}
		requests := conn.http2Parser.Parse(r.Method, r.Payload, uint64(r.Duration))
		for _, req := range requests {
			stats.observe(req.Status.Http(), "", req.Duration)
			trace.Http2Request(req.Method, req.Path, req.Scheme, req.Status, req.Duration)
		}
	case l7.ProtocolPostgres:
		if r.Method != l7.MethodStatementClose {
			stats.observe(r.Status.String(), "", r.Duration)
		}
		if conn.postgresParser == nil {
			conn.postgresParser = l7.NewPostgresParser()
		}
		query := conn.postgresParser.Parse(r.Payload)
		trace.PostgresQuery(query, r.Status.Error(), r.Duration)
	case l7.ProtocolMysql:
		//fmt.Println("mysql mysql")
		//fmt.Println(conn)
		if r.Method != l7.MethodStatementClose {
			stats.observe(r.Status.String(), "", r.Duration)
		}
		if conn.mysqlParser == nil {
			conn.mysqlParser = l7.NewMysqlParser()
		}
		query := conn.mysqlParser.Parse(r.Payload, r.StatementId)
		//trace.MysqlQuery(query, r.Status.Error(), r.Duration)

		apmTrace, ok := c.getTrace(r.TraceId)
		//fmt.Println("mysql r.TraceId:", r.TraceId)
		//fmt.Println("ok:", ok)
		//fmt.Println("traceMap:", len(c.traceMap))
		if ok {
			apmTrace.MysqlTraceQuery(query, r.Status.Error(), r.Duration, conn.ActualDest)
		}
	case l7.ProtocolMemcached:
		stats.observe(r.Status.String(), "", r.Duration)
		cmd, items := l7.ParseMemcached(r.Payload)
		trace.MemcachedQuery(cmd, items, r.Status.Error(), r.Duration)
	case l7.ProtocolRedis:
		fmt.Println("redis redis")
		stats.observe(r.Status.String(), "", r.Duration)
		cmd, args := l7.ParseRedis(r.Payload)
		fmt.Println("cmd", cmd)
		fmt.Println("args", args)
		apmTrace, ok := c.getTrace(r.TraceId)
		fmt.Println("redis r.TraceId:", r.TraceId)
		fmt.Println("ok:", ok)
		fmt.Println("traceMap:", len(c.traceMap))
		if ok {
			apmTrace.RedisTraceQuery(cmd, args, r.Status.Error(), r.Duration)
		}
		//trace.RedisQuery(cmd, args, r.Status.Error(), r.Duration)
	case l7.ProtocolMongo:
		stats.observe(r.Status.String(), "", r.Duration)
		query := l7.ParseMongo(r.Payload)
		trace.MongoQuery(query, r.Status.Error(), r.Duration)
	case l7.ProtocolKafka, l7.ProtocolCassandra:
		stats.observe(r.Status.String(), "", r.Duration)
	case l7.ProtocolRabbitmq, l7.ProtocolNats:
		stats.observe(r.Status.String(), r.Method.String(), 0)
	}
	return nil
}

func (c *Container) buildInstanceID() {
	c.lock.Lock()
	defer c.lock.Unlock()
	for address, val := range c.getListens() {
		if val == 1 {
			ip := address.IP()
			if ip.Is4() && !ip.IsLoopback() {
				// 获取端口号
				port := address.Port()
				c.instanceID.IntVal, c.instanceID.HashtVal = utils.SetInsID(fmt.Sprintf("%s:%d", ip, port))
				break
			}
		}
	}
}

func (c *Container) StackProcess(event ebpftracer.StackEvent, tracer *ebpftracer.Tracer) {
	c.lock.Lock()
	defer c.lock.Unlock()
	// get the associated uprobe
	switch event.Location {
	case 0: // ret
		uprobe, err := c.GetUprobe(event, tracer)
		if err != nil {
			//fmt.Println("GetUprobeGetUprobe errer: %v", err)
			// log.Errorf("failed to get uprobe for event %+v: %+v", event, err)
			return
		}

		if event.TraceId <= 0 {
			//fmt.Println("StackProcess TraceId id 0")
			// log.Errorf("failed to get uprobe for event %+v: %+v", event, err)
			return
		}

		//fmt.Println("StackProcess 函数入口开始处理 fun:", event.TraceId, uprobe.Funcname, event.TimeNsEnd-event.TimeNsStart)
		apmTrace, ok := c.getTrace(event.TraceId)
		if ok {
			//fmt.Println("append FuncTraceQuery fun:", event.TraceId, uprobe.Funcname, event.Pid)
			duration := event.TimeNsEnd - event.TimeNsStart
			apmTrace.FuncTraceQuery(uprobe.Funcname, time.Duration(duration), int(event.Level), int(event.Fpid), int(event.Nid))
		}
	case 2: // coroutine
		//fmt.Println("StackProcess 协程入口开始处理 fun:", event.TraceId, event.Goid, event.TimeNsEnd-event.TimeNsStart)
		apmTrace, ok := c.getTrace(event.TraceId)
		if ok {
			//fmt.Println("append FuncTraceQuery fun:", event.TraceId, "coroutine"+strconv.FormatUint(event.Goid, 10), event.Pid, event.Fpid)
			duration := event.TimeNsEnd - event.TimeNsStart
			apmTrace.FuncTraceQuery("coroutine"+strconv.FormatUint(event.Goid, 10), time.Duration(duration), int(event.Level), int(event.Fpid), int(event.Nid))
		}
	}
}

func (c *Container) StackProcessBak(event ebpftracer.StackEvent, tracer *ebpftracer.Tracer) {
	c.lock.Lock()
	defer c.lock.Unlock()
	// get the associated uprobe
	uprobe, err := c.GetUprobe(event, tracer)
	if err != nil {
		//fmt.Println("GetUprobeGetUprobe errer: %v", err)
		// log.Errorf("failed to get uprobe for event %+v: %+v", event, err)
		return
	}

	if event.TraceId <= 0 {
		//fmt.Println("StackProcess TraceId id 0")
		// log.Errorf("failed to get uprobe for event %+v: %+v", event, err)
		return
	}

	length := len(c.goEventStacks[event.TraceId])
	if length <= 0 {
		c.goEventStacks = map[uint64]map[uint64][]ebpftracer.StackFunEvent{}
		c.goEventStacks[event.TraceId] = map[uint64][]ebpftracer.StackFunEvent{}
		c.goEventStacks[event.TraceId][event.Goid] = []ebpftracer.StackFunEvent{}
	}

	switch event.Location {
	case 0: // entry
		level := 100
		pid := 100000 + event.Goid
		length := len(c.goEventStacks[event.TraceId][event.Goid])
		//fmt.Println("StackProcess 函数入口开始处理 fun:", event.TraceId, uprobe.Funcname, length)
		if length > 0 {
			funEvent := c.goEventStacks[event.TraceId][event.Goid][length-1]
			//fmt.Println("funEvent goEventStacks fun:", event.TraceId, funEvent.Uprobe.Funcname, funEvent.Nid, funEvent.Level)
			lastEvent := funEvent.StackEvent
			if lastEvent.Location == event.Location && lastEvent.Ip == event.Ip && lastEvent.Bp != event.CallerBp {
				// duplicated entry event due to stack expansion/shrinkage
				// log.Debugf("duplicated entry event: %+v", event)
				//fmt.Println("GetUprobeGetUprobe duplicated entry event: %+v", event)
				c.goEventStacks[event.TraceId][event.Goid][length-1].StackEvent = event
				return
			}
			level = int(funEvent.Level)
			pid = uint64(funEvent.Nid)
		}
		rand.Seed(time.Now().UnixNano())
		// append new event
		//fmt.Println("append goEventStacks fun:", event.TraceId, uprobe.Funcname, pid, level+1)
		c.goEventStacks[event.TraceId][event.Goid] = append(c.goEventStacks[event.TraceId][event.Goid], ebpftracer.StackFunEvent{
			StackEvent: event,
			Uprobe:     &uprobe,
			Level:      level + 1,
			Pid:        int(pid),
			Nid:        rand.Intn(100000000),
		})
		length = len(c.goEventStacks[event.TraceId][event.Goid])
		//fmt.Println("append goEventStacks end:", event.TraceId, uprobe.Funcname, pid, level+1, length)
	case 1: // ret
		//// fmt.Println("StackProcess 函数出口开始处理 fun:", event.TraceId, uprobe.Funcname)
		length := len(c.goEventStacks[event.TraceId][event.Goid])
		//fmt.Println("StackProcess 函数出口开始处理 fun:", event.TraceId, uprobe.Funcname, length)
		if length > 0 {
			funEvent := c.goEventStacks[event.TraceId][event.Goid][length-1]
			entFun := funEvent.StackEvent
			apmTrace, ok := c.getTrace(event.TraceId)
			//fmt.Println("StackProcess 函数出口处理 fun:", event.TraceId, funEvent.Uprobe.Funcname, length)
			if ok {
				//fmt.Println("append FuncTraceQuery fun:", event.TraceId, uprobe.Funcname, funEvent.Pid, funEvent.Level, funEvent.Nid)
				duration := event.TimeNsEnd - entFun.TimeNsStart
				c.goEventStacks[event.TraceId][event.Goid] = c.goEventStacks[event.TraceId][event.Goid][:length-1]
				apmTrace.FuncTraceQuery(funEvent.Uprobe.Funcname, time.Duration(duration), funEvent.Level, funEvent.Pid, funEvent.Nid)
			}
		}
	}

}

// ResolveAddress returns the symbol(s) and offset of the given address.
func (c *Container) ResolveAddress(addr uint64, symbols []elf.Symbol) (syms []elf.Symbol, offset uint, err error) {
	if addr == 0 {
		// err = errors.Wrapf(SymbolNotFoundError, "0")
		return
	}
	// symbols, _, err := e.Symbols()
	if err != nil {
		return
	}

	idx := sort.Search(len(symbols), func(i int) bool { return symbols[i].Value > addr })
	if idx == 0 {
		// err = errors.Wrap(SymbolNotFoundError, fmt.Sprintf("%x", addr))
		return
	}

	// why diff symbol may contains the same addr?
	sym := symbols[idx-1]
	for i := idx - 1; i >= 0 && symbols[i].Value == sym.Value; i-- {
		syms = append(syms, symbols[i])
	}
	for i := idx; i < len(symbols) && symbols[i].Value == sym.Value; i++ {
		syms = append(syms, symbols[i])
	}
	return syms, uint(addr - sym.Value), nil
}

func (c *Container) GetUprobe(event ebpftracer.StackEvent, tracer *ebpftracer.Tracer) (uprobe tracer.Uprobe, err error) {
	//fmt.Println("GetUprobe entory:")
	syms, _, err := c.ResolveAddress(event.Ip, tracer.Symbols)
	if err != nil {
		return
	}
	for _, sym := range syms {
		//fmt.Println("GetUprobeGetUprobeGetUprobe: %s+%d", sym.Name, offset)
		uprobe, ok := tracer.UprobesMap[fmt.Sprintf("%s", sym.Name)]
		if ok {
			return uprobe, nil
		}
	}
	err = errors.New("uprobe not found")
	return
}