Graham McIntire
9eb85faebd
Add True Shot Ammo (Shopify JSON), Palmetto State Armory (Magento HTML), Bulk Ammo (Magento HTML), and Natchez Shooters Supply (GraphQL API). Extends scraper infrastructure with HttpClient.post_json/3 and an optional fetch/2 callback on the Scraper behaviour for scrapers that need custom HTTP flows (e.g. GraphQL POST requests).
97 lines
2.7 KiB
Elixir
97 lines
2.7 KiB
Elixir
defmodule Ammoprices.Scraping.Retailers.TrueShotAmmo do
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@moduledoc false
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@behaviour Ammoprices.Scraping.Scraper
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alias Ammoprices.Scraping.TextDetector
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@slug_to_collection %{
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"9mm-luger" => "ammunition-pistol-ammo-9mm",
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"45-acp" => "ammunition-pistol-ammo-45-acp",
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"380-acp" => "ammunition-pistol-ammo-380-acp",
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"40-sw" => "ammunition-pistol-ammo-40-s-w",
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"38-special" => "ammunition-pistol-ammo-38-special",
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"357-magnum" => "ammunition-pistol-ammo-357-magnum",
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"10mm-auto" => "ammunition-pistol-ammo-10mm",
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"556-223" => "ammunition-rifle-ammo-223-5-56",
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"308-win" => "ammunition-rifle-ammo-308-7-62x51",
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"762x39" => "ammunition-rifle-ammo-7-62x39",
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"300-blackout" => "ammunition-rifle-ammo-300-blackout",
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"65-creedmoor" => "ammunition-rifle-ammo-6-5-creedmoor",
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"22-lr" => "ammunition-rimfire-ammo-22-lr",
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"12-gauge" => "ammunition-shotgun-ammo-12-gauge",
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"20-gauge" => "ammunition-shotgun-ammo-20-gauge"
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}
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@impl true
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def retailer_slug, do: "true-shot-ammo"
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@impl true
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def category_url(caliber) do
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case Map.get(@slug_to_collection, caliber.slug) do
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nil -> nil
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collection -> "/collections/#{collection}/products.json"
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end
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end
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@impl true
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def parse_products(%{"products" => products}) do
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products
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|> Enum.map(&parse_product/1)
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|> Enum.reject(&is_nil/1)
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end
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def parse_products(_), do: []
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defp parse_product(product) do
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title = product["title"]
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first_variant = List.first(product["variants"])
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case first_variant do
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nil ->
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nil
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variant ->
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price_cents = parse_price(variant["price"])
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round_count = parse_round_count(variant["title"])
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ppr = if round_count && round_count > 0, do: round(price_cents / round_count)
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%{
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title: title,
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url: "/products/#{product["handle"]}",
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brand: product["vendor"],
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price_cents: price_cents,
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price_per_round_cents: ppr,
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grain_weight: extract_grain_weight(title),
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round_count: round_count,
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casing: TextDetector.detect_casing(title),
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subsonic: TextDetector.detect_subsonic(title),
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in_stock: variant["available"] == true
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}
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end
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end
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defp parse_price(price_str) when is_binary(price_str) do
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price_str
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|> String.to_float()
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|> Kernel.*(100)
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|> round()
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end
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defp parse_price(_), do: 0
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defp parse_round_count(title) when is_binary(title) do
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case Integer.parse(title) do
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{count, _} -> count
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:error -> nil
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end
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end
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defp parse_round_count(_), do: nil
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defp extract_grain_weight(title) do
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case Regex.run(~r/(\d+)\s*[Gg]rain/i, title) do
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[_, weight] -> String.to_integer(weight)
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_ -> nil
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end
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end
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end
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