package test

import (
	"context"
	"encoding/json"
	"errors"
	"io"
	"io/ioutil"
	"net/http"
	"net/http/httptest"
	"net/url"

	"github.com/gogo/protobuf/proto"
	"github.com/pilosa/pilosa"
	"github.com/pilosa/pilosa/internal"
	"github.com/pilosa/pilosa/pql"
)

// Handler represents a test wrapper for pilosa.Handler.
type Handler struct {
	*pilosa.Handler
	Executor HandlerExecutor
}

// NewHandler returns a new instance of Handler.
func NewHandler() *Handler {
	h := &Handler{
		Handler: pilosa.NewHandler(),
	}
	h.Handler.Executor = &h.Executor
	h.Handler.LogOutput = ioutil.Discard

	// Handler test messages can no-op.
	h.Broadcaster = pilosa.NopBroadcaster

	return h
}

// HandlerExecutor is a mock implementing pilosa.Handler.Executor.
type HandlerExecutor struct {
	cluster   *pilosa.Cluster
	ExecuteFn func(ctx context.Context, index string, query *pql.Query, slices []uint64, opt *pilosa.ExecOptions) ([]interface{}, error)
}

func (c *HandlerExecutor) Cluster() *pilosa.Cluster { return c.cluster }

func (c *HandlerExecutor) Execute(ctx context.Context, index string, query *pql.Query, slices []uint64, opt *pilosa.ExecOptions) ([]interface{}, error) {
	return c.ExecuteFn(ctx, index, query, slices, opt)
}

// Server represents a test wrapper for httptest.Server.
type Server struct {
	*httptest.Server
	Handler *Handler
}

// NewServer returns a test server running on a random port.
func NewServer() *Server {
	s := &Server{
		Handler: NewHandler(),
	}
	s.Server = httptest.NewServer(s.Handler.Handler)

	// Update handler to use hostname.
	uri, err := pilosa.NewURIFromAddress(s.Host())
	if err != nil {
		panic(err)
	}
	s.Handler.URI = uri

	// Handler test messages can no-op.
	s.Handler.Broadcaster = pilosa.NopBroadcaster
	// Create a default cluster on the handler
	s.Handler.Cluster = NewCluster(1)
	s.Handler.Cluster.Nodes[0].Host = s.Host()

	return s
}

// LocalStatus returns the state of the local node as well as the
// holder (indexes/frames) according to the local node.
func (s *Server) LocalStatus() (proto.Message, error) {
	if s.Handler.Holder == nil {
		return nil, errors.New("Server.Holder is nil")
	}

	ns := internal.NodeStatus{
		Host:    s.Handler.Handler.URI.HostPort(),
		State:   pilosa.NodeStateUp,
		Indexes: pilosa.EncodeIndexes(s.Handler.Holder.Indexes()),
	}

	// Append Slice list per this Node's indexes
	for _, index := range ns.Indexes {
		index.Slices = s.Handler.Cluster.OwnsSlices(index.Name, index.MaxSlice, s.Handler.URI.HostPort())
	}

	return &ns, nil
}

// ClusterStatus returns the NodeState for all nodes in the cluster.
func (s *Server) ClusterStatus() (proto.Message, error) {
	// Assuming we are only testing this with one Node
	// So just return its status
	return s.LocalStatus()
}

// HandleRemoteStatus just need to implement a nop to complete the Interface
func (s *Server) HandleRemoteStatus(pb proto.Message) error { return nil }

// Host returns the hostname of the running server.
func (s *Server) Host() string { return MustParseURLHost(s.URL) }

func (s *Server) HostURI() *pilosa.URI {
	uri, err := pilosa.NewURIFromAddress(s.URL)
	if err != nil {
		panic(err)
	}
	return uri
}

// MustParseURLHost parses rawurl and returns the hostname. Panic on error.
func MustParseURLHost(rawurl string) string {
	u, err := url.Parse(rawurl)
	if err != nil {
		panic(err)
	}
	return u.Host
}

// MustNewHTTPRequest creates a new HTTP request. Panic on error.
func MustNewHTTPRequest(method, urlStr string, body io.Reader) *http.Request {
	req, err := http.NewRequest(method, urlStr, body)
	if err != nil {
		panic(err)
	}
	return req
}

// MustMarshalJSON marshals v to JSON. Panic on error.
func MustMarshalJSON(v interface{}) []byte {
	buf, err := json.Marshal(v)
	if err != nil {
		panic(err)
	}
	return buf
}

// MustReadAll reads a reader into a buffer and returns it. Panic on error.
func MustReadAll(r io.Reader) []byte {
	buf, err := ioutil.ReadAll(r)
	if err != nil {
		panic(err)
	}
	return buf
}