package components

import (
	"errors"
)

type Server struct {
	Comment    string
	Listens    []*ServerListen
	Directives []IDirective
}

func NewServer(directive IDirective) (*Server, error) {
	server := &Server{}
	if block := directive.GetBlock(); block != nil {
		server.Comment = block.GetComment()
		directives := block.GetDirectives()
		for _, dir := range directives {

			switch dir.GetName() {
			case "listen":
				server.Listens = append(server.Listens, NewServerListen(dir.GetParameters()))
			default:
				server.Directives = append(server.Directives, dir)
			}
		}
		return server, nil
	}
	return nil, errors.New("server directive must have a block")
}

func (s *Server) GetName() string {
	return "server"
}

func (s *Server) GetParameters() []string {
	return []string{}
}

func (s *Server) GetBlock() IBlock {
	return s
}

func (s *Server) GetComment() string {
	return s.Comment
}

func (s *Server) GetDirectives() []IDirective {
	directives := make([]IDirective, 0)
	for _, ls := range s.Listens {
		directives = append(directives, ls)
	}
	directives = append(directives, s.Directives...)
	return directives
}

func (s *Server) AddListen(bind string, defaultServer bool, params ...string) {
	listen := &ServerListen{
		Bind:       bind,
		Parameters: params,
	}
	if defaultServer {
		listen.DefaultServer = DefaultServer
	}
	s.Listens = append(s.Listens, listen)
}

func (s *Server) UpdateListen(bind string, defaultServer bool, params ...string) {
	listen := &ServerListen{
		Bind:       bind,
		Parameters: params,
	}
	if defaultServer {
		listen.DefaultServer = DefaultServer
	}
	var newListens []*ServerListen
	exist := false
	for _, li := range s.Listens {
		if li.Bind == bind {
			exist = true
			newListens = append(newListens, listen)
		} else {
			newListens = append(newListens, li)
		}
	}
	if !exist {
		newListens = append(newListens, listen)
	}

	s.Listens = newListens
}

func (s *Server) DeleteListen(bind string) {
	var newListens []*ServerListen
	for _, li := range s.Listens {
		if li.Bind != bind {
			newListens = append(newListens, li)
		}
	}
	s.Listens = newListens
}

func (s *Server) DeleteServerName(name string) {
	var names []string
	dirs := s.FindDirectives("server_name")
	params := dirs[0].GetParameters()
	for _, param := range params {
		if param != name {
			names = append(names, param)
		}
	}
	s.UpdateServerName(names)
}

func (s *Server) AddServerName(name string) {
	dirs := s.FindDirectives("server_name")
	params := dirs[0].GetParameters()
	params = append(params, name)
	s.UpdateServerName(params)
}

func (s *Server) UpdateServerName(names []string) {
	serverNameDirective := Directive{
		Name:       "server_name",
		Parameters: names,
	}
	s.UpdateDirectives("server_name", serverNameDirective)
}

func (s *Server) UpdateRoot(path string) {
	rootDir := Directive{
		Name:       "root",
		Parameters: []string{path},
	}
	s.UpdateDirectives("root", rootDir)
}

func (s *Server) UpdateRootLocation() {
	newDir := Directive{
		Name:       "location",
		Parameters: []string{"/"},
		Block:      &Block{},
	}
	block := &Block{}
	block.Directives = append(block.Directives, &Directive{
		Name:       "root",
		Parameters: []string{"index.html"},
	})
	newDir.Block = block
}

func (s *Server) UpdateRootProxy(proxy []string) {
	newDir := Directive{
		Name:       "location",
		Parameters: []string{"/"},
		Block:      &Block{},
	}
	block := &Block{}
	block.Directives = append(block.Directives, &Directive{
		Name:       "proxy_pass",
		Parameters: proxy,
	})
	newDir.Block = block
	s.UpdateDirectiveBySecondKey("location", "/", newDir)
}

func (s *Server) UpdateDirectiveBySecondKey(name string, key string, directive Directive) {
	directives := s.Directives
	index := -1
	for i, dir := range directives {
		if dir.GetName() == name && dir.GetParameters()[0] == key {
			index = i
			break
		}
	}
	if index > -1 {
		directives[index] = &directive
	} else {
		directives = append(directives, &directive)
	}
	s.Directives = directives
}

func (s *Server) RemoveListenByBind(bind string) {
	index := 0
	listens := s.Listens
	for _, listen := range s.Listens {
		if listen.Bind != bind || len(listen.Parameters) > 0 {
			listens[index] = listen
			index++
		}
	}
	s.Listens = listens
}

func (s *Server) FindDirectives(directiveName string) []IDirective {
	directives := make([]IDirective, 0)
	for _, directive := range s.Directives {
		if directive.GetName() == directiveName {
			directives = append(directives, directive)
		}
		if directive.GetBlock() != nil {
			directives = append(directives, directive.GetBlock().FindDirectives(directiveName)...)
		}
	}

	return directives
}

func (s *Server) UpdateDirectives(directiveName string, directive Directive) {
	directives := s.Directives
	index := -1
	for i, dir := range directives {
		if dir.GetName() == directiveName {
			index = i
			break
		}
	}
	if index > -1 {
		directives[index] = &directive
	} else {
		directives = append(directives, &directive)
	}
	s.Directives = directives
}

func (s *Server) AddDirectives(directive Directive) {
	directives := append(s.Directives, &directive)
	s.Directives = directives
}

func (s *Server) RemoveDirectives(names []string) {
	nameMaps := make(map[string]struct{}, len(names))
	for _, name := range names {
		nameMaps[name] = struct{}{}
	}
	directives := s.Directives
	var newDirectives []IDirective
	for _, dir := range directives {
		if _, ok := nameMaps[dir.GetName()]; ok {
			continue
		}
		newDirectives = append(newDirectives, dir)
	}
	s.Directives = newDirectives
}