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defmodule WalletNotifications.Preference do |
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@moduledoc """ |
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Per-user, per-channel notification preference. |
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Controls whether a user receives notifications on a given channel |
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and allows defining suppression rules (quiet hours, opt-outs). |
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Suppression rules map — keys: |
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- `:quiet_hours` — `%{start_hour: 22, end_hour: 7}` (local time) |
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- `:opt_out_types` — list of notification types to suppress, e.g. `[:promotional]` |
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- `:daily_limit` — max notifications per day on this channel (integer | nil) |
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""" |
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@enforce_keys [:user_id, :channel, :enabled] |
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defstruct [ |
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:user_id, |
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:channel, |
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:updated_at, |
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enabled: true, |
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suppression_rules: %{} |
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] |
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@type t :: %__MODULE__{ |
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user_id: String.t(), |
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channel: atom(), |
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enabled: boolean(), |
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suppression_rules: map(), |
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updated_at: DateTime.t() | nil |
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} |
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@doc "Creates or overwrites a user preference for a channel." |
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@spec new(user_id :: String.t(), channel :: atom(), opts :: keyword()) :: t() |
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def new(user_id, channel, opts \\ []) do |
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%__MODULE__{ |
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user_id: user_id, |
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channel: channel, |
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enabled: Keyword.get(opts, :enabled, true), |
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suppression_rules: Keyword.get(opts, :suppression_rules, %{}), |
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updated_at: DateTime.utc_now() |
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} |
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end |
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@doc "Returns true if notifications should be sent (enabled + not suppressed)." |
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@spec allowed?(t(), notification_type :: atom()) :: boolean() |
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def allowed?(%__MODULE__{enabled: false}, _type), do: false |
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def allowed?(%__MODULE__{suppression_rules: rules}, type) do |
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opt_out_types = Map.get(rules, :opt_out_types, []) |
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type not in opt_out_types |
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end |
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end |