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package skynet

import (
"encoding/json"
"fmt"
"github.com/4ad/doozer"
"log"
"path"
"strings"
)

type Query struct {
Service string
Version string
Host string
Port string
Region string
UUID string
Registered *bool
DoozerConn *DoozerConnection
doozerRev int64

// Internal use only
pathLength int
paths map[string]*doozer.FileInfo
files map[string]*doozer.FileInfo
}

func (q *Query) VisitDir(path string, f *doozer.FileInfo) bool {
parts := strings.Split(path, "/")

// If we know we are looking for dir's at a specified level no need to dig deeper
if q.pathLength > 0 && len(parts) > q.pathLength {
return false
}

// If we know the length we need for a proper path we don't need any leading paths
if q.pathLength <= 0 || q.pathLength == len(parts) {
q.paths[path] = f
}

return true
}

func (q *Query) VisitFile(path string, f *doozer.FileInfo) {
q.files[path] = f
}

func (q *Query) makePath() (path string) {
path = "/services"

if q.Service == "" {
return
}
path += "/" + q.Service

if q.Version == "" {
return
}
path += "/" + q.Version

if q.Region == "" {
return
}
path += "/" + q.Region

if q.Host == "" {
return
}
path += "/" + q.Host

if q.Port == "" {
return
}
path += "/" + q.Port

return
}

func (q *Query) search() {
q.paths = make(map[string]*doozer.FileInfo, 0)
q.files = make(map[string]*doozer.FileInfo, 0)

q.doozerRev = q.getCurrentDoozerRevision()

path := q.makePath()

q.DoozerConn.Walk(q.doozerRev, path, q, nil)
}

func (q *Query) FindHosts() []string {
q.pathLength = 6
q.search()

return q.matchingPaths()
}

func (q *Query) FindRegions() []string {
q.pathLength = 5
q.search()

return q.matchingPaths()
}

func (q *Query) FindServices() []string {
q.pathLength = 3
q.search()

return q.matchingPaths()
}

func (q *Query) FindServiceVersions() []string {
q.pathLength = 4
q.search()

return q.matchingPaths()
}

func (q *Query) FindInstances() []*ServiceInfo {
q.search()

results := make([]*ServiceInfo, 0)

// At this point we don't know which values were supplied
// if all prefixed dir's were supplied no filtering is needed, but this may be all nodes
for path, _ := range q.files {
var s ServiceInfo

data, _, err := q.DoozerConn.Get(path, q.doozerRev)
if err != nil {
log.Panic(err.Error())
}

err = json.Unmarshal(data, &s)

if !q.ServiceMatches(s) {
continue
}

results = append(results, &s)
}

// make sure we can garbage collect
// who knows how long the app might keep the query object around for
q.paths = nil
q.files = nil

return results
}

func (q *Query) matchingPaths() []string {
results := make([]string, 0)
unique := make(map[string]string, 0)

for p, dir := range q.paths {

if !q.pathMatches(p) {
continue
}

if _, ok := unique[dir.Name]; !ok {
pathMatches := true

// If Port or Registered supplied, we have to inspect files to ensure the path has a match in it
if q.Port != "" || q.Registered != nil {
pathMatches = false
rev := q.DoozerConn.GetCurrentRevision()

files, _ := q.DoozerConn.Getdirinfo(p, rev, 0, -1)

if files != nil {
for _, file := range files {
data, _, err := q.DoozerConn.Get(path.Join(p, file.Name), rev)

if err == nil {
s := ServiceInfo{}
err = json.Unmarshal(data, &s)

if q.ServiceMatches(s) {
pathMatches = true
break
}
}
}
}
}

if pathMatches {
unique[dir.Name] = dir.Name
results = append(results, dir.Name)
}
}
}

// reset internal variables also make sure we can garbage collect
// who knows how long the app might keep the query object around for
q.paths = nil
q.files = nil
q.pathLength = 0

return results
}

// We aren't able to match a path for a query on port or registered
func (q *Query) pathMatches(path string) bool {
parts := strings.Split(path, "/")

if len(parts) >= 3 && q.Service != "" && parts[2] != q.Service {
return false
}

if len(parts) >= 4 && q.Version != "" && parts[3] != q.Version {
return false
}

if len(parts) >= 5 && q.Region != "" && parts[4] != q.Region {
return false
}

if len(parts) >= 6 && q.Host != "" && parts[5] != q.Host {
return false
}

return true
}

func (q *Query) ServiceMatches(s ServiceInfo) bool {
if q.Service != "" && s.Config.Name != q.Service {
return false
}

if q.Version != "" && s.Config.Version != q.Version {
return false
}

if q.Region != "" && s.Config.Region != q.Region {
return false
}

if q.Host != "" && s.Config.ServiceAddr.IPAddress != q.Host {
return false
}

if q.Port != "" && fmt.Sprintf("%d", s.Config.ServiceAddr.Port) != q.Port {
return false
}

if q.Registered != nil && s.Registered != *q.Registered {
return false
}

if q.UUID != "" && s.Config.UUID != q.UUID {
return false
}

return true
}

func (q *Query) Reset() {
q.Service = ""
q.Version = ""
q.Region = ""
q.Host = ""
q.Registered = nil
q.Port = ""
}

func (q *Query) getCurrentDoozerRevision() int64 {
revision, err := q.DoozerConn.Rev()

if err != nil {
log.Panic(err.Error())
}

return revision
}
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