package handlers

import (
	"net/http"
	"strconv"

	"cmr-backend/internal/apperr"
	"cmr-backend/internal/httpapi/middleware"
	"cmr-backend/internal/httpx"
	"cmr-backend/internal/service"
)

type SessionHandler struct {
	sessionService *service.SessionService
}

func NewSessionHandler(sessionService *service.SessionService) *SessionHandler {
	return &SessionHandler{sessionService: sessionService}
}

func (h *SessionHandler) GetDetail(w http.ResponseWriter, r *http.Request) {
	auth := middleware.GetAuthContext(r.Context())
	if auth == nil {
		httpx.WriteError(w, apperr.New(http.StatusUnauthorized, "unauthorized", "missing auth context"))
		return
	}

	result, err := h.sessionService.GetSession(r.Context(), r.PathValue("sessionPublicID"), auth.UserID)
	if err != nil {
		httpx.WriteError(w, err)
		return
	}
	httpx.WriteJSON(w, http.StatusOK, map[string]any{"data": result})
}

func (h *SessionHandler) ListMine(w http.ResponseWriter, r *http.Request) {
	auth := middleware.GetAuthContext(r.Context())
	if auth == nil {
		httpx.WriteError(w, apperr.New(http.StatusUnauthorized, "unauthorized", "missing auth context"))
		return
	}

	limit := 20
	if raw := r.URL.Query().Get("limit"); raw != "" {
		if parsed, err := strconv.Atoi(raw); err == nil {
			limit = parsed
		}
	}

	result, err := h.sessionService.ListMySessions(r.Context(), auth.UserID, limit)
	if err != nil {
		httpx.WriteError(w, err)
		return
	}
	httpx.WriteJSON(w, http.StatusOK, map[string]any{"data": result})
}

func (h *SessionHandler) Start(w http.ResponseWriter, r *http.Request) {
	var req service.SessionActionInput
	if err := httpx.DecodeJSON(r, &req); err != nil {
		httpx.WriteError(w, apperr.New(http.StatusBadRequest, "invalid_json", "invalid request body: "+err.Error()))
		return
	}
	req.SessionPublicID = r.PathValue("sessionPublicID")

	result, err := h.sessionService.StartSession(r.Context(), req)
	if err != nil {
		httpx.WriteError(w, err)
		return
	}
	httpx.WriteJSON(w, http.StatusOK, map[string]any{"data": result})
}

func (h *SessionHandler) Finish(w http.ResponseWriter, r *http.Request) {
	var req service.FinishSessionInput
	if err := httpx.DecodeJSON(r, &req); err != nil {
		httpx.WriteError(w, apperr.New(http.StatusBadRequest, "invalid_json", "invalid request body: "+err.Error()))
		return
	}
	req.SessionPublicID = r.PathValue("sessionPublicID")

	result, err := h.sessionService.FinishSession(r.Context(), req)
	if err != nil {
		httpx.WriteError(w, err)
		return
	}
	httpx.WriteJSON(w, http.StatusOK, map[string]any{"data": result})
}
