package publichttp

import (
	"log/slog"
	"net/http"

	"galaxy/lobby/internal/domain/common"
	"galaxy/lobby/internal/service/listmyracenames"
	"galaxy/lobby/internal/service/registerracename"
)

// Public HTTP route patterns for the race-name surface owned by
// (register) and (self-service list).
const (
	registerRaceNamePath = "/api/v1/lobby/race-names/register"
	myRaceNamesPath      = "/api/v1/lobby/my/race-names"
)

// registerRaceNameRoutes binds the public-port race-name routes:
// the `lobby.race_name.register` POST and the
// `lobby.race_names.list` GET. Both routes require the X-User-ID
// header so the actor is always a user; administrators have no
// equivalent admin path on the internal port.
func registerRaceNameRoutes(mux *http.ServeMux, deps Dependencies, logger *slog.Logger) {
	h := &raceNameHandlers{
		deps:   deps,
		logger: logger.With("component", "public_http.racenames"),
	}
	mux.HandleFunc("POST "+registerRaceNamePath, h.handleRegister)
	mux.HandleFunc("GET "+myRaceNamesPath, h.handleListMy)
}

type raceNameHandlers struct {
	deps   Dependencies
	logger *slog.Logger
}

// registerRaceNameRequest is the JSON shape for
// POST /api/v1/lobby/race-names/register.
type registerRaceNameRequest struct {
	RaceName     string `json:"race_name"`
	SourceGameID string `json:"source_game_id"`
}

// registerRaceNameResponse mirrors `ports.RegisteredName` on the wire.
// `registered_at_ms` carries the Unix-millisecond timestamp of the
// successful Register commit; idempotent retries return the same value
// recorded by the original commit.
type registerRaceNameResponse struct {
	CanonicalKey   string `json:"canonical_key"`
	RaceName       string `json:"race_name"`
	SourceGameID   string `json:"source_game_id"`
	RegisteredAtMs int64  `json:"registered_at_ms"`
}

// myRaceNamesResponse is the JSON shape for
// GET /api/v1/lobby/my/race-names. The three slices are non-nil but
// possibly empty so consumers can iterate without a presence check.
type myRaceNamesResponse struct {
	Registered   []registeredRaceNameItem  `json:"registered"`
	Pending      []pendingRaceNameItem     `json:"pending"`
	Reservations []raceNameReservationItem `json:"reservations"`
}

// registeredRaceNameItem mirrors `ports.RegisteredName`. It matches the
// `RegisteredRaceName` schema field-for-field so the OpenAPI
// model can be reused.
type registeredRaceNameItem struct {
	CanonicalKey   string `json:"canonical_key"`
	RaceName       string `json:"race_name"`
	SourceGameID   string `json:"source_game_id"`
	RegisteredAtMs int64  `json:"registered_at_ms"`
}

// pendingRaceNameItem mirrors `ports.PendingRegistration` for the
// self-service view. `source_game_id` is the game whose capable finish
// promoted the reservation; `eligible_until_ms` is the deadline by
// which `lobby.race_name.register` must succeed.
type pendingRaceNameItem struct {
	CanonicalKey    string `json:"canonical_key"`
	RaceName        string `json:"race_name"`
	SourceGameID    string `json:"source_game_id"`
	ReservedAtMs    int64  `json:"reserved_at_ms"`
	EligibleUntilMs int64  `json:"eligible_until_ms"`
}

// raceNameReservationItem mirrors `ports.Reservation` enriched with
// the current `game_status` joined from the game store. `game_status`
// is empty when the underlying game record cannot be loaded.
type raceNameReservationItem struct {
	CanonicalKey string `json:"canonical_key"`
	RaceName     string `json:"race_name"`
	GameID       string `json:"game_id"`
	ReservedAtMs int64  `json:"reserved_at_ms"`
	GameStatus   string `json:"game_status"`
}

func (h *raceNameHandlers) handleListMy(writer http.ResponseWriter, request *http.Request) {
	if h.deps.ListMyRaceNames == nil {
		writeError(writer, http.StatusInternalServerError, "internal_error",
			"list my race names service is not wired")
		return
	}

	games := &gameHandlers{deps: h.deps, logger: h.logger}
	actor, ok := games.requireUserActor(writer, request)
	if !ok {
		return
	}

	out, err := h.deps.ListMyRaceNames.Handle(request.Context(), listmyracenames.Input{
		Actor: actor,
	})
	if err != nil {
		writeErrorFromService(writer, h.logger, err)
		return
	}

	resp := myRaceNamesResponse{
		Registered:   make([]registeredRaceNameItem, 0, len(out.Registered)),
		Pending:      make([]pendingRaceNameItem, 0, len(out.Pending)),
		Reservations: make([]raceNameReservationItem, 0, len(out.Reservations)),
	}
	for _, entry := range out.Registered {
		resp.Registered = append(resp.Registered, registeredRaceNameItem{
			CanonicalKey:   entry.CanonicalKey,
			RaceName:       entry.RaceName,
			SourceGameID:   entry.SourceGameID,
			RegisteredAtMs: entry.RegisteredAtMs,
		})
	}
	for _, entry := range out.Pending {
		resp.Pending = append(resp.Pending, pendingRaceNameItem{
			CanonicalKey:    entry.CanonicalKey,
			RaceName:        entry.RaceName,
			SourceGameID:    entry.SourceGameID,
			ReservedAtMs:    entry.ReservedAtMs,
			EligibleUntilMs: entry.EligibleUntilMs,
		})
	}
	for _, entry := range out.Reservations {
		resp.Reservations = append(resp.Reservations, raceNameReservationItem{
			CanonicalKey: entry.CanonicalKey,
			RaceName:     entry.RaceName,
			GameID:       entry.GameID,
			ReservedAtMs: entry.ReservedAtMs,
			GameStatus:   entry.GameStatus,
		})
	}

	writeJSON(writer, http.StatusOK, resp)
}

func (h *raceNameHandlers) handleRegister(writer http.ResponseWriter, request *http.Request) {
	if h.deps.RegisterRaceName == nil {
		writeError(writer, http.StatusInternalServerError, "internal_error",
			"register race name service is not wired")
		return
	}

	games := &gameHandlers{deps: h.deps, logger: h.logger}
	actor, ok := games.requireUserActor(writer, request)
	if !ok {
		return
	}

	var body registerRaceNameRequest
	if err := decodeStrictJSON(request.Body, &body); err != nil {
		writeError(writer, http.StatusBadRequest, "invalid_request", err.Error())
		return
	}

	out, err := h.deps.RegisterRaceName.Handle(request.Context(), registerracename.Input{
		Actor:        actor,
		SourceGameID: common.GameID(body.SourceGameID),
		RaceName:     body.RaceName,
	})
	if err != nil {
		writeErrorFromService(writer, h.logger, err)
		return
	}

	writeJSON(writer, http.StatusOK, registerRaceNameResponse{
		CanonicalKey:   out.CanonicalKey,
		RaceName:       out.RaceName,
		SourceGameID:   out.SourceGameID,
		RegisteredAtMs: out.RegisteredAtMs,
	})
}