package api

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

// deviceTokenRequest is the JSON body for device registration.
type deviceTokenRequest struct {
	Token    string `json:"token"`
	Platform string `json:"platform"` // "ios" or "android"
}

// RegisterDevice saves a push notification token for the authenticated user.
// POST /api/v1/devices
func (h *Handlers) RegisterDevice(w http.ResponseWriter, r *http.Request) {
	did, ok := h.requireAuth(w, r)
	if !ok {
		return
	}

	var body deviceTokenRequest
	if err := decodeBody(r, &body); err != nil {
		writeError(w, http.StatusBadRequest, "invalid JSON")
		return
	}

	if body.Token == "" {
		writeError(w, http.StatusBadRequest, "token is required")
		return
	}
	if body.Platform != "ios" && body.Platform != "android" {
		writeError(w, http.StatusBadRequest, "platform must be 'ios' or 'android'")
		return
	}

	_, err := h.DB.ExecContext(r.Context(), `
		INSERT INTO device_tokens (did, push_token, platform)
		VALUES (?, ?, ?)
		ON CONFLICT (did, push_token) DO UPDATE SET
			platform = excluded.platform,
			updated_at = CURRENT_TIMESTAMP
	`, did.String(), body.Token, body.Platform)
	if err != nil {
		slog.Warn("api: register device", "did", did, "err", err)
		writeError(w, http.StatusInternalServerError, "failed to register device")
		return
	}

	writeJSON(w, http.StatusCreated, map[string]string{"status": "registered"})
}

// UnregisterDevice removes a push notification token.
// DELETE /api/v1/devices/{token}
func (h *Handlers) UnregisterDevice(w http.ResponseWriter, r *http.Request) {
	did, ok := h.requireAuth(w, r)
	if !ok {
		return
	}

	token := r.PathValue("token")
	if token == "" {
		writeError(w, http.StatusBadRequest, "missing token")
		return
	}

	_, err := h.DB.ExecContext(r.Context(), `
		DELETE FROM device_tokens WHERE did = ? AND push_token = ?
	`, did.String(), token)
	if err != nil {
		slog.Warn("api: unregister device", "did", did, "err", err)
		writeError(w, http.StatusInternalServerError, "failed to unregister")
		return
	}

	writeJSON(w, http.StatusOK, map[string]string{"status": "removed"})
}