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<?php

namespace Corals\Foundation\Classes\Cache;

use Corals\Foundation\Traits\Cache\CachePrefixing;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Query\Builder;
use Illuminate\Support\Collection;

class CacheKey
{
    use CachePrefixing;

    protected $eagerLoad;
    protected $model;
    protected $query;

    public function __construct(
        array   $eagerLoad,
        Model   $model,
        Builder $query
    )
    {
        $this->eagerLoad = $eagerLoad;
        $this->model = $model;
        $this->query = $query;
    }

    public function make(
        array  $columns = ["*"],
               $idColumn = null,
        string $keyDifferentiator = ""
    ): string
    {
        $key = $this->getCachePrefix();
        $key .= $this->getModelSlug();
        $key .= $this->getIdColumn($idColumn ?: "");
        $key .= $this->getQueryColumns($columns);
        $key .= $this->getWhereClauses();
        $key .= $this->getWithModels();
        $key .= $this->getOrderByClauses();
        $key .= $this->getOffsetClause();
        $key .= $this->getLimitClause();
        $key .= $keyDifferentiator;

        return $key;
    }

    protected function getIdColumn(string $idColumn): string
    {
        return $idColumn ? "_{$idColumn}" : "";
    }

    protected function getLimitClause(): string
    {
        if (!$this->query->limit) {
            return "";
        }

        return "-limit_{$this->query->limit}";
    }

    protected function getModelSlug(): string
    {
        return \Str::slug(get_class($this->model));
    }

    protected function getOffsetClause(): string
    {
        if (!$this->query->offset) {
            return "";
        }

        return "-offset_{$this->query->offset}";
    }

    protected function getOrderByClauses(): string
    {
        $orders = collect($this->query->orders);

        return $orders
            ->reduce(function ($carry, $order) {
                if (($order["type"] ?? "") === "Raw") {
                    return $carry . "_orderByRaw_" . \Str::slug($order["sql"]);
                }

                return $carry . "_orderBy_" . $order["column"] . "_" . $order["direction"];
            })
            ?: "";
    }

    protected function getQueryColumns(array $columns): string
    {
        if ($columns === ["*"] || $columns === []) {
            return "";
        }

        return "_" . implode("_", $columns);
    }

    protected function getTypeClause($where): string
    {
        $type = in_array($where["type"], ["In", "NotIn", "Null", "NotNull", "between"])
            ? strtolower($where["type"])
            : strtolower($where["operator"] ?? '');

        return str_replace(" ", "_", $type);
    }

    protected function getValuesClause(array $where = null): string
    {
        if (in_array($where["type"], ["NotNull"])) {
            return "";
        }

        $values = $this->getValuesFromWhere($where);
        $values = $this->getValuesFromBindings($values);

        return "_" . $values;
    }

    protected function getValuesFromWhere(array $where): string
    {
        return is_array(\Arr::get($where, "values"))
            ? implode("_", $where["values"])
            : "";
    }

    protected function getValuesFromBindings(string $values): string
    {
        if (!$values && $this->query->bindings["where"] ?? false) {
            $values = implode("_", $this->query->bindings["where"]);
        }

        return $values;
    }

    protected function getWhereClauses(array $wheres = []): string
    {
        return $this->getWheres($wheres)
                ->reduce(function ($carry, $where) {
                    $value = $this->getNestedClauses($where);
                    $value .= $this->getColumnClauses($where);
                    $value .= $this->getRawClauses($where);
                    $value .= $this->getOtherClauses($where, $carry);

                    return $value;
                })
            . "";
    }

    protected function getNestedClauses(array $where): string
    {
        if (!in_array($where["type"], ["Exists", "Nested", "NotExists"])) {
            return "";
        }

        return "_" . strtolower($where["type"]) . $this->getWhereClauses($where["query"]->wheres);
    }

    protected function getColumnClauses(array $where): string
    {
        if ($where["type"] !== "Column") {
            return "";
        }

        return "_{$where["boolean"]}_{$where["first"]}_{$where["operator"]}_{$where["second"]}";
    }

    protected function getRawClauses(array $where): string
    {
        if ($where["type"] !== "raw") {
            return "";
        }

        return "_{$where["boolean"]}_" . \Str::slug($where["sql"]);
    }

    protected function getOtherClauses(array $where, string $carry = null): string
    {
        if (in_array($where["type"], ["Exists", "Nested", "NotExists", "raw", "Column"])) {
            return "";
        }

        $value = $this->getTypeClause($where);
        $value .= $this->getValuesClause($where);

        return "{$carry}-{$where["column"]}_{$value}";
    }

    protected function getWheres(array $wheres): Collection
    {
        $wheres = collect($wheres);

        if ($wheres->isEmpty()) {
            $wheres = collect($this->query->wheres);
        }

        return $wheres;
    }

    protected function getWithModels(): string
    {
        $eagerLoads = collect($this->eagerLoad);

        if ($eagerLoads->isEmpty()) {
            return "";
        }

        return "-" . implode("-", $eagerLoads->keys()->toArray());
    }
}