<?php
namespace ToDownload\Sellers;

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

final class Pricing {
	public const TIER_STARTER = 'starter';
	public const TIER_PRO = 'pro';
	public const TIER_STUDIO = 'studio';

	public const USER_META_TIER = 'ToDownload_seller_tier_v1';
	public const USER_META_TIER_EXPIRES_AT = 'ToDownload_seller_tier_expires_at_v1';
	public const USER_META_SUBSCRIPTION_ID = 'ToDownload_seller_subscription_id_v1';
	public const USER_META_SUBSCRIPTION_STATUS = 'ToDownload_seller_subscription_status_v1';

	/**
	 * @return array{annual_fee_usd:int, platform_fee_percent:float, processing_fees_included:bool}
	 */
	public static function tier_config(string $tier): array {
		$tier = self::normalize_tier($tier);
		$settings = get_option('ToDownload_settings', []);
		if (!is_array($settings)) {
			$settings = [];
		}

		$defaults = [
			self::TIER_STARTER => ['annual_fee_usd' => 0, 'platform_fee_percent' => 12.0],
			self::TIER_PRO => ['annual_fee_usd' => 149, 'platform_fee_percent' => 3.5],
			self::TIER_STUDIO => ['annual_fee_usd' => 299, 'platform_fee_percent' => 1.0],
		];

		$fee_key = 'seller_tier_' . $tier . '_platform_fee_percent';
		$annual_key = 'seller_tier_' . $tier . '_annual_fee_usd';
		$platform_fee_percent = isset($settings[$fee_key]) ? (float) $settings[$fee_key] : (float) ($defaults[$tier]['platform_fee_percent'] ?? 0);
		$platform_fee_percent = max(0.0, min(100.0, $platform_fee_percent));
		$annual_fee_usd = isset($settings[$annual_key]) ? (int) $settings[$annual_key] : (int) ($defaults[$tier]['annual_fee_usd'] ?? 0);
		$annual_fee_usd = max(0, $annual_fee_usd);

		return [
			'annual_fee_usd' => $annual_fee_usd,
			'platform_fee_percent' => $platform_fee_percent,
			// v1: payment processing fees are seller-paid across all tiers.
			'processing_fees_included' => false,
		];
	}

	public static function normalize_tier(string $tier): string {
		$tier = strtolower(trim($tier));
		$allowed = [self::TIER_STARTER => true, self::TIER_PRO => true, self::TIER_STUDIO => true];
		return isset($allowed[$tier]) ? $tier : self::TIER_STARTER;
	}

	public static function get_seller_tier(int $seller_user_id): string {
		if ($seller_user_id <= 0) {
			return self::TIER_STARTER;
		}
		$tier = (string) get_user_meta($seller_user_id, self::USER_META_TIER, true);
		$tier = self::normalize_tier($tier);
		self::maybe_auto_downgrade_if_expired($seller_user_id, $tier);
		$tier = (string) get_user_meta($seller_user_id, self::USER_META_TIER, true);
		return self::normalize_tier($tier);
	}

	public static function set_seller_tier(int $seller_user_id, string $tier, string $expires_at_ymd = ''): void {
		if ($seller_user_id <= 0) {
			return;
		}
		$tier = self::normalize_tier($tier);
		update_user_meta($seller_user_id, self::USER_META_TIER, $tier);

		$expires_at_ymd = trim($expires_at_ymd);
		if ($expires_at_ymd === '') {
			delete_user_meta($seller_user_id, self::USER_META_TIER_EXPIRES_AT);
			return;
		}
		if (!preg_match('/^\d{4}-\d{2}-\d{2}$/', $expires_at_ymd)) {
			delete_user_meta($seller_user_id, self::USER_META_TIER_EXPIRES_AT);
			return;
		}
		update_user_meta($seller_user_id, self::USER_META_TIER_EXPIRES_AT, $expires_at_ymd);
	}

	public static function platform_fee_percent_for_seller(int $seller_user_id): float {
		$tier = self::get_seller_tier($seller_user_id);
		$cfg = self::tier_config($tier);
		return max(0.0, min(100.0, (float) ($cfg['platform_fee_percent'] ?? 0)));
	}

	public static function processing_fees_included_for_seller(int $seller_user_id): bool {
		$tier = self::get_seller_tier($seller_user_id);
		$cfg = self::tier_config($tier);
		return !empty($cfg['processing_fees_included']);
	}

	// Backwards-compatible alias for older call sites.
	public static function stripe_fees_included_for_seller(int $seller_user_id): bool {
		return self::processing_fees_included_for_seller($seller_user_id);
	}

	public static function maybe_auto_downgrade_if_expired(int $seller_user_id, ?string $known_tier = null): void {
		if ($seller_user_id <= 0) {
			return;
		}
		$tier = $known_tier !== null ? self::normalize_tier($known_tier) : self::normalize_tier((string) get_user_meta($seller_user_id, self::USER_META_TIER, true));
		if ($tier !== self::TIER_PRO && $tier !== self::TIER_STUDIO) {
			return;
		}

		$expires = (string) get_user_meta($seller_user_id, self::USER_META_TIER_EXPIRES_AT, true);
		$expires = trim($expires);
		if ($expires === '' || !preg_match('/^\d{4}-\d{2}-\d{2}$/', $expires)) {
			return;
		}

		$ts = strtotime($expires . ' 00:00:00 UTC');
		if (!$ts) {
			return;
		}
		if (time() < $ts) {
			return;
		}

		// Downgrade when expired (renewal failed / not renewed).
		update_user_meta($seller_user_id, self::USER_META_TIER, self::TIER_STARTER);
		delete_user_meta($seller_user_id, self::USER_META_TIER_EXPIRES_AT);
	}

	/**
	 * Simple processing fee estimate (USD): 2.9% + 30c.
	 */
	public static function estimate_processing_fee_minor(int $amount_minor, string $currency): int {
		$currency = strtoupper(trim($currency));
		if ($amount_minor <= 0) {
			return 0;
		}
		if ($currency !== 'USD') {
			return 0;
		}

		$percent = 2.9;
		$fixed_minor = 30;
		$fee = (int) round(($amount_minor * ($percent / 100.0)) + $fixed_minor);
		return max(0, $fee);
	}
}