<?php

namespace Modules\Core\Stoic;

use Illuminate\Support\Facades\Storage;
use Symfony\Component\Yaml\Yaml;

class Stoic
{
    public static array $config = [];
    public static array $presets = [];
    public static string $thumbs_path;

    private static function loadConfig(): void
    {
        if (!empty(static::$config)) {
            return;
        }
        $config = Yaml::parseFile(resource_path("stoic/stoic_config.yml"));
        static::$config = $config;
        static::$thumbs_path = $config["thumbs_path"];
        static::$presets = $config["presets"];
    }

    public static function presets(): array
    {
        static::loadConfig();
        return static::$presets;
    }

    // Returns the public URL for a stoic image at a given preset.
    public static function image(string $filename, string $preset): string
    {
        static::loadConfig();

        $ext = strtolower(pathinfo($filename, PATHINFO_EXTENSION));

        if ($ext === "svg") {
            $rel = static::thumbsRelPath() . "images/" . $filename;
            return Storage::disk("public")->url($rel);
        }

        $webp = substr($filename, 0, -strlen($ext)) . "webp";
        $rel = static::thumbsRelPath() . "presets/" . $preset . "/" . $webp;

        return Storage::disk("public")->url($rel);
    }

    // Generates the full srcset string for all configured presets.
    public static function srcset(string $filename): string
    {
        static::loadConfig();

        $ext = strtolower(pathinfo($filename, PATHINFO_EXTENSION));
        if ($ext === "svg") {
            return "";
        }

        return collect(static::$presets)
            ->map(
                fn($p) => static::image($filename, $p["code"]) .
                    " " .
                    $p["width"] .
                    "w",
            )
            ->implode(", ");
    }

    // Returns [width, height] for a given preset from the sidecar JSON.
    public static function dimensions(string $filename, string $preset): array
    {
        static::loadConfig();

        $ext = strtolower(pathinfo($filename, PATHINFO_EXTENSION));
        if ($ext === "svg") {
            return [null, null];
        }

        $rel = static::thumbsRelPath() . "images/" . $filename . ".json";
        $path = Storage::disk("public")->path($rel);
        $meta = json_decode(@file_get_contents($path), true);

        $p = $meta["presets"][$preset] ?? null;
        if (!$p) {
            return [null, null];
        }

        return [(int) $p["w"], (int) $p["h"]];
    }

    // Path of the thumbs directory relative to the public storage disk root.
    // Uses a fixed marker so it works regardless of the app's base path (local vs Docker).
    private static function thumbsRelPath(): string
    {
        $marker = "/storage/app/public/";
        $pos = strpos(static::$thumbs_path, $marker);

        if ($pos !== false) {
            return substr(static::$thumbs_path, $pos + strlen($marker));
        }

        return ltrim(static::$thumbs_path, "/");
    }

    public static function token(string $email): string
    {
        $ttl = 60;
        $payload = base64_encode(
            json_encode([
                "email" => $email,
                "exp" => time() + $ttl,
            ]),
        );

        $sig = hash_hmac(
            "sha256",
            $payload,
            config("services.stoic.sso_secret"),
        );

        $token = "t=" . urlencode($payload) . "&s=" . $sig;

        return $token;
    }

    public static function hasMany(
        string $relation,
        array $slugs,
        string $prefix,
    ) {
        $slugs = array_map(
            fn($i) => str_replace($prefix . "/", "", $i),
            $slugs,
        );

        return $relation::whereIn("slug", $slugs)->get();
    }

    public static function hasOne(
        string $relation,
        string $slug,
        string $prefix,
    ) {
        $slug = str_replace($prefix . "/", "", $slug);
        return $relation::firstWhere("slug", $slug);
    }
}