Graham McIntire
bbe5bde145
Phoenix 1.8 app that scrapes ammunition retailers (Lucky Gunner, SGAmmo) for price data and displays historical price trends. - Data model: retailers, calibers, products, price snapshots - Scraper infrastructure with Req, Floki, realistic browser headers - Oban-scheduled scrape jobs (every 4h with randomized delays) - LiveView pages: homepage with category cards, caliber detail with price table, Chart.js price history, and price stats banner - 18 seeded calibers across handgun/rifle/rimfire/shotgun categories - 77 tests
471 lines
16 KiB
Elixir
471 lines
16 KiB
Elixir
defmodule AmmopricesWeb.CaliberLive.Show do
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@moduledoc false
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use AmmopricesWeb, :live_view
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import AmmopricesWeb.PriceComponents
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alias Ammoprices.Catalog
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alias Ammoprices.Prices
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@range_days %{
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"7d" => 7,
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"30d" => 30,
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"90d" => 90,
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"1y" => 365,
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"all" => 3650
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}
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@impl true
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def mount(%{"slug" => slug}, _session, socket) do
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caliber = Catalog.get_caliber_by_slug!(slug)
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if connected?(socket) do
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Phoenix.PubSub.subscribe(Ammoprices.PubSub, "prices:updated")
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end
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socket =
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socket
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|> assign(
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page_title: caliber.name,
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caliber: caliber,
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in_stock_filter: true,
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chart_range: "30d"
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)
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|> load_products()
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|> load_chart_data()
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|> load_price_stats()
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{:ok, socket}
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end
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@impl true
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def handle_event("toggle_stock_filter", _params, socket) do
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socket =
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socket
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|> assign(:in_stock_filter, !socket.assigns.in_stock_filter)
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|> load_products()
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{:noreply, socket}
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end
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@impl true
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def handle_event("change_range", %{"range" => range}, socket) do
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socket =
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socket
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|> assign(:chart_range, range)
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|> load_chart_data()
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{:noreply, push_event(socket, "update-chart", %{data: socket.assigns.chart_data})}
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end
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@impl true
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def handle_info({:prices_updated, _}, socket) do
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socket =
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socket
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|> load_products()
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|> load_chart_data()
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|> load_price_stats()
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{:noreply, push_event(socket, "update-chart", %{data: socket.assigns.chart_data})}
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end
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defp load_products(socket) do
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%{caliber: caliber, in_stock_filter: in_stock_filter} = socket.assigns
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opts =
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if in_stock_filter do
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[in_stock: true, limit: 200]
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else
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[limit: 200]
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end
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snapshots = Prices.latest_prices_for_caliber(caliber.id, opts)
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# Preload product+retailer for each snapshot
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product_ids = Enum.map(snapshots, & &1.product_id)
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products_map =
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if product_ids == [] do
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%{}
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else
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import Ecto.Query
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from(p in Catalog.Product,
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where: p.id in ^product_ids,
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preload: [:retailer]
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)
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|> Ammoprices.Repo.all()
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|> Map.new(&{&1.id, &1})
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end
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rows =
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Enum.map(snapshots, fn snap ->
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product = Map.get(products_map, snap.product_id)
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%{
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id: snap.id,
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product: product,
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price_cents: snap.price_cents,
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price_per_round_cents: snap.price_per_round_cents,
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in_stock: snap.in_stock
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}
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end)
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stream(socket, :products, rows, reset: true)
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end
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defp load_chart_data(socket) do
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%{caliber: caliber, chart_range: range} = socket.assigns
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days = Map.get(@range_days, range, 30)
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daily_data = Prices.daily_averages_for_caliber(caliber.id, days: days)
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chart_data = %{
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labels: Enum.map(daily_data, &Date.to_iso8601(&1.date)),
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avg: Enum.map(daily_data, & &1.avg_ppr),
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min: Enum.map(daily_data, & &1.min_ppr),
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max: Enum.map(daily_data, & &1.max_ppr)
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}
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assign(socket, :chart_data, chart_data)
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end
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defp load_price_stats(socket) do
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stats = Prices.price_stats_for_caliber(socket.assigns.caliber.id)
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assign(socket, :price_stats, stats)
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end
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defp format_stat_cpr(nil), do: "--"
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defp format_stat_cpr(cents) when cents < 100 do
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"#{cents}\u00A2"
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end
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defp format_stat_cpr(cents) do
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"$#{:erlang.float_to_binary(cents / 100, decimals: 2)}"
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end
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@impl true
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def render(assigns) do
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~H"""
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<Layouts.app flash={@flash}>
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<div class="space-y-5">
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<%!-- Breadcrumb + Heading --%>
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<div class="space-y-1">
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<nav class="text-xs text-base-content/50">
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<.link navigate={~p"/"} class="hover:text-primary transition-colors">Home</.link>
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<span class="mx-1">/</span>
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<span class="capitalize">{@caliber.category}</span>
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</nav>
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<h1
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id="caliber-heading"
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class="text-2xl sm:text-3xl font-black tracking-tight text-base-content"
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>
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{@caliber.name}
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</h1>
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</div>
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<%!-- Price Stats Banner --%>
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<div id="price-stats" class="grid grid-cols-2 sm:grid-cols-4 gap-3">
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<div class="rounded-lg border border-base-300 bg-base-200/30 px-4 py-3">
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<div class="text-xs text-base-content/50 uppercase tracking-wider font-medium">
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Current Low
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</div>
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<div class="text-xl font-black tabular-nums text-success mt-0.5">
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{format_stat_cpr(@price_stats.current_min)}
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</div>
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</div>
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<div class="rounded-lg border border-base-300 bg-base-200/30 px-4 py-3">
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<div class="text-xs text-base-content/50 uppercase tracking-wider font-medium">
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30-Day Avg
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</div>
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<div class="text-xl font-black tabular-nums text-base-content mt-0.5">
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{format_stat_cpr(@price_stats.thirty_day_avg)}
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</div>
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</div>
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<div class="rounded-lg border border-base-300 bg-base-200/30 px-4 py-3">
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<div class="text-xs text-base-content/50 uppercase tracking-wider font-medium">
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All-Time Low
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</div>
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<div class="text-xl font-black tabular-nums text-info mt-0.5">
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{format_stat_cpr(@price_stats.all_time_low)}
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</div>
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</div>
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<div class="rounded-lg border border-base-300 bg-base-200/30 px-4 py-3">
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<div class="text-xs text-base-content/50 uppercase tracking-wider font-medium">
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All-Time High
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</div>
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<div class="text-xl font-black tabular-nums text-error mt-0.5">
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{format_stat_cpr(@price_stats.all_time_high)}
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</div>
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</div>
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</div>
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<%!-- Price Chart --%>
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<div class="rounded-lg border border-base-300 bg-base-100 p-4 space-y-3">
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<div class="flex items-center justify-between">
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<h2 class="text-sm font-semibold text-base-content/70 uppercase tracking-wider">
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Price History
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</h2>
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<div class="flex gap-1">
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<button
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:for={range <- ~w(7d 30d 90d 1y all)}
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id={"range-#{range}"}
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phx-click="change_range"
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phx-value-range={range}
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class={[
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"px-2.5 py-1 text-xs font-semibold rounded-md transition-all duration-150 cursor-pointer",
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if(@chart_range == range,
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do: "bg-primary text-primary-content",
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else: "text-base-content/50 hover:text-base-content hover:bg-base-200"
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)
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]}
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>
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{String.upcase(range)}
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</button>
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</div>
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</div>
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<div
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id="price-chart-container"
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phx-hook=".PriceChart"
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data-chart-data={Jason.encode!(@chart_data)}
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class="h-64 sm:h-80"
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>
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<canvas id="price-chart" class="w-full h-full"></canvas>
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</div>
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</div>
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<%!-- Filters --%>
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<div class="flex items-center gap-3">
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<button
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id="filter-in-stock"
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phx-click="toggle_stock_filter"
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class={[
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"flex items-center gap-2 px-3 py-1.5 text-xs font-semibold rounded-lg border transition-all duration-150 cursor-pointer",
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if(@in_stock_filter,
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do: "border-success/40 bg-success/10 text-success",
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else: "border-base-300 bg-base-100 text-base-content/60 hover:border-base-content/20"
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)
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]}
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>
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<span class={[
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"inline-block w-1.5 h-1.5 rounded-full",
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if(@in_stock_filter, do: "bg-success", else: "bg-base-content/30")
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]} /> In Stock Only
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</button>
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</div>
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<%!-- Product Table --%>
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<div class="overflow-x-auto rounded-lg border border-base-300">
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<table class="w-full text-sm">
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<thead>
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<tr class="border-b border-base-300 bg-base-200/50">
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<th class="text-left px-3 py-2.5 font-semibold text-base-content/70 text-xs uppercase tracking-wider">
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Product
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</th>
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<th class="text-left px-3 py-2.5 font-semibold text-base-content/70 text-xs uppercase tracking-wider hidden sm:table-cell">
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Retailer
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</th>
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<th class="text-right px-3 py-2.5 font-semibold text-base-content/70 text-xs uppercase tracking-wider">
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CPR
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</th>
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<th class="text-right px-3 py-2.5 font-semibold text-base-content/70 text-xs uppercase tracking-wider hidden sm:table-cell">
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Price
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</th>
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<th class="text-center px-3 py-2.5 font-semibold text-base-content/70 text-xs uppercase tracking-wider hidden md:table-cell">
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Rounds
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</th>
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<th class="text-center px-3 py-2.5 font-semibold text-base-content/70 text-xs uppercase tracking-wider hidden md:table-cell">
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Casing
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</th>
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<th class="text-center px-3 py-2.5 font-semibold text-base-content/70 text-xs uppercase tracking-wider hidden lg:table-cell">
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Status
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</th>
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</tr>
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</thead>
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<tbody id="products" phx-update="stream">
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<tr
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:for={{dom_id, row} <- @streams.products}
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id={dom_id}
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class="border-b border-base-300/50 hover:bg-base-200/30 transition-colors"
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>
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<td class="px-3 py-2.5">
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<a
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href={row.product.url}
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target="_blank"
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rel="noopener noreferrer"
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class="text-sm font-medium text-base-content hover:text-primary transition-colors line-clamp-2"
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>
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{row.product.title}
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</a>
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<div class="sm:hidden text-xs text-base-content/50 mt-0.5">
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{row.product.retailer.name}
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</div>
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</td>
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<td class="px-3 py-2.5 hidden sm:table-cell">
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<span class="text-xs text-base-content/60">{row.product.retailer.name}</span>
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</td>
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<td class="px-3 py-2.5 text-right">
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<.price_per_round
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cents={row.price_per_round_cents}
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class="text-sm font-bold text-success"
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/>
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</td>
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<td class="px-3 py-2.5 text-right hidden sm:table-cell">
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<span class="font-mono tabular-nums text-base-content/80">
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{"$#{:erlang.float_to_binary(row.price_cents / 100, decimals: 2)}"}
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</span>
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</td>
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<td class="px-3 py-2.5 text-center hidden md:table-cell">
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<span class="text-xs text-base-content/60">{row.product.round_count || "—"}</span>
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</td>
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<td class="px-3 py-2.5 text-center hidden md:table-cell">
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<span :if={row.product.casing} class="text-xs capitalize text-base-content/60">
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{row.product.casing}
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</span>
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<span :if={!row.product.casing} class="text-xs text-base-content/30">—</span>
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</td>
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<td class="px-3 py-2.5 text-center hidden lg:table-cell">
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<.stock_badge in_stock={row.in_stock} />
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</td>
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</tr>
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</tbody>
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</table>
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<div
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id="products-empty"
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class="hidden only:block p-8 text-center text-base-content/40 text-sm"
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>
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No products found for this caliber yet. Prices will appear after the next scrape.
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</div>
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</div>
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<%!-- Colocated Chart.js Hook --%>
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<script :type={Phoenix.LiveView.ColocatedHook} name=".PriceChart">
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import Chart from "@/vendor/chart.js"
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export default {
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mounted() {
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const data = JSON.parse(this.el.dataset.chartData)
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this.chart = this.createChart(data)
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this.handleEvent("update-chart", ({data}) => {
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this.updateChart(data)
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})
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},
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createChart(data) {
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const canvas = this.el.querySelector("canvas")
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if (!canvas) return null
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const ctx = canvas.getContext("2d")
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// Get CSS custom property values for theming
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const style = getComputedStyle(document.documentElement)
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const textColor = style.getPropertyValue("color") || "#666"
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return new Chart(ctx, {
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type: "line",
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data: {
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labels: data.labels,
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datasets: [
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{
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label: "Avg CPR",
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data: data.avg,
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borderColor: "oklch(0.65 0.19 160)",
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backgroundColor: "oklch(0.65 0.19 160 / 0.1)",
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borderWidth: 2,
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fill: false,
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tension: 0.3,
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pointRadius: data.labels.length > 60 ? 0 : 3,
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pointHoverRadius: 5
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},
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{
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label: "Min CPR",
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data: data.min,
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borderColor: "oklch(0.7 0.15 200)",
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backgroundColor: "oklch(0.7 0.15 200 / 0.05)",
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borderWidth: 1.5,
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borderDash: [4, 4],
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fill: false,
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tension: 0.3,
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pointRadius: 0,
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pointHoverRadius: 4
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}
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]
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},
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options: {
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responsive: true,
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maintainAspectRatio: false,
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interaction: {
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mode: "index",
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intersect: false
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},
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plugins: {
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legend: {
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display: true,
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position: "top",
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labels: {
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boxWidth: 12,
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padding: 16,
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usePointStyle: true,
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font: { size: 11 }
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}
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},
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tooltip: {
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callbacks: {
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label: function(ctx) {
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const val = ctx.raw
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if (val < 100) return ctx.dataset.label + ": " + val + "¢/rd"
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return ctx.dataset.label + ": $" + (val / 100).toFixed(2) + "/rd"
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}
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}
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}
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},
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scales: {
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x: {
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type: "category",
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ticks: {
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maxTicksLimit: 8,
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font: { size: 10 }
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},
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grid: { display: false }
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},
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y: {
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ticks: {
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callback: function(val) {
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if (val < 100) return val + "¢"
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return "$" + (val / 100).toFixed(2)
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},
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font: { size: 10 }
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},
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grid: { color: "oklch(0.5 0 0 / 0.08)" }
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}
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}
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}
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})
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},
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updateChart(data) {
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if (!this.chart) {
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this.chart = this.createChart(data)
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return
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}
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this.chart.data.labels = data.labels
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this.chart.data.datasets[0].data = data.avg
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this.chart.data.datasets[0].pointRadius = data.labels.length > 60 ? 0 : 3
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this.chart.data.datasets[1].data = data.min
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this.chart.update()
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},
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destroyed() {
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if (this.chart) {
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this.chart.destroy()
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}
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}
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}
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</script>
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</div>
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</Layouts.app>
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"""
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end
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end
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