<?php

declare(strict_types=1);

namespace Contractless\Api\Config;

use RuntimeException;

final class Environment
{
    /** @var array<string, string> */
    private array $values;

    private function __construct(array $values)
    {
        $this->values = $values;
    }

    public static function load(string $path): self
    {
        if (!is_file($path) || !is_readable($path)) {
            throw new RuntimeException('The API environment file is not readable.');
        }

        $values = parse_ini_file($path, false, INI_SCANNER_RAW);
        if ($values === false) {
            throw new RuntimeException('The API environment file could not be parsed.');
        }

        $normalized = [];
        foreach ($values as $name => $value) {
            if (!is_string($value)) {
                throw new RuntimeException("API setting $name must be a string.");
            }
            $normalized[$name] = trim($value);
        }

        return new self($normalized);
    }

    public function required(string $name): string
    {
        $value = $this->values[$name] ?? '';
        if ($value === '') {
            throw new RuntimeException("Required API setting $name is missing.");
        }
        return $value;
    }

    public function string(string $name, string $default): string
    {
        return $this->values[$name] ?? $default;
    }

    public function float(string $name, float $default): float
    {
        $value = $this->values[$name] ?? '';
        if ($value === '') {
            return $default;
        }
        if (!is_numeric($value) || (float) $value <= 0) {
            throw new RuntimeException("API setting $name must be greater than zero.");
        }
        return (float) $value;
    }

    public function int(string $name, int $default, int $minimum, int $maximum): int
    {
        $value = $this->values[$name] ?? '';
        if ($value === '') {
            return $default;
        }
        if (filter_var($value, FILTER_VALIDATE_INT) === false) {
            throw new RuntimeException("API setting $name must be an integer.");
        }
        $integer = (int) $value;
        if ($integer < $minimum || $integer > $maximum) {
            throw new RuntimeException(
                "API setting $name must be between $minimum and $maximum.",
            );
        }
        return $integer;
    }

    public function bool(string $name, bool $default): bool
    {
        $value = strtolower($this->values[$name] ?? '');
        if ($value === '') {
            return $default;
        }
        return match ($value) {
            '1', 'true', 'yes', 'on' => true,
            '0', 'false', 'no', 'off' => false,
            default => throw new RuntimeException(
                "API setting $name must be true or false.",
            ),
        };
    }
}