<?php

namespace App\Services\Frontdesk;

use App\Models\Branch;
use App\Models\Device;
use App\Models\Organization;
use Carbon\Carbon;

class PlanService
{
    public function planKey(Organization $organization): string
    {
        $settings = $organization->settings ?? [];
        $plan = (string) ($settings['plan'] ?? 'free');

        if (in_array($plan, ['pro', 'enterprise'], true) && ! empty($settings['plan_expires_at'])) {
            if (Carbon::parse($settings['plan_expires_at'])->isPast()) {
                return 'free';
            }
        }

        return array_key_exists($plan, config('frontdesk.plans', [])) ? $plan : 'free';
    }

    public function isPro(Organization $organization): bool
    {
        return $this->planKey($organization) === 'pro';
    }

    public function isEnterprise(Organization $organization): bool
    {
        return $this->planKey($organization) === 'enterprise';
    }

    public function hasPaidPlan(Organization $organization): bool
    {
        return in_array($this->planKey($organization), ['pro', 'enterprise'], true);
    }

    /** @return array<string, mixed> */
    public function plan(Organization $organization): array
    {
        $key = $this->planKey($organization);

        return [
            'key' => $key,
            ...(array) config('frontdesk.plans.'.$key, []),
        ];
    }

    /**
     * Included host emails per calendar month.
     * Null means unlimited (Enterprise). Free/Pro use finite allowances.
     */
    public function freeEmailsPerMonth(Organization $organization): ?int
    {
        $value = config('frontdesk.plans.'.$this->planKey($organization).'.free_emails_per_month', 100);

        return $value === null ? null : (int) $value;
    }

    /**
     * Included host SMS per calendar month.
     * Null means unlimited (Enterprise). 0 means none included.
     */
    public function freeSmsPerMonth(Organization $organization): ?int
    {
        $plan = (array) config('frontdesk.plans.'.$this->planKey($organization), []);
        if (! array_key_exists('free_sms_per_month', $plan)) {
            return 0;
        }

        $value = $plan['free_sms_per_month'];

        return $value === null ? null : (int) $value;
    }

    /**
     * Paid plans with a finite allowance stop sending once the monthly cap is hit.
     * Free keeps pay-as-you-go after its free email allowance.
     */
    public function emailAllowanceExhausted(Organization $organization, int $sentThisMonth): bool
    {
        $allowance = $this->freeEmailsPerMonth($organization);

        return $this->hasPaidPlan($organization)
            && $allowance !== null
            && $sentThisMonth >= $allowance;
    }

    public function smsAllowanceExhausted(Organization $organization, int $sentThisMonth): bool
    {
        $allowance = $this->freeSmsPerMonth($organization);

        return $this->hasPaidPlan($organization)
            && $allowance !== null
            && $sentThisMonth >= $allowance;
    }

    public function activeBranchCount(Organization $organization): int
    {
        return Branch::query()
            ->where('organization_id', $organization->id)
            ->where('is_active', true)
            ->count();
    }

    /** Seat allotment purchased for the current paid period; 0 when free or unset. */
    public function billedBranches(Organization $organization): int
    {
        return max(0, (int) (($organization->settings ?? [])['billed_branches'] ?? 0));
    }

    public function canAddBranch(Organization $organization, int $currentCount): bool
    {
        $limit = config('frontdesk.plans.'.$this->planKey($organization).'.max_branches');
        if ($limit !== null) {
            return $currentCount < (int) $limit;
        }

        // Paid plans with a purchased seat allotment cannot exceed it until they expand.
        $billed = $this->billedBranches($organization);
        if ($this->hasPaidPlan($organization) && $billed > 0) {
            return $this->activeBranchCount($organization) < $billed;
        }

        return true;
    }

    public function canActivateBranch(Organization $organization): bool
    {
        $limit = config('frontdesk.plans.'.$this->planKey($organization).'.max_branches');
        if ($limit !== null) {
            return $this->activeBranchCount($organization) < (int) $limit;
        }

        $billed = $this->billedBranches($organization);
        if ($this->hasPaidPlan($organization) && $billed > 0) {
            return $this->activeBranchCount($organization) < $billed;
        }

        return true;
    }

    public function branchLimitMessage(Organization $organization): string
    {
        if ($this->hasPaidPlan($organization) && $this->billedBranches($organization) > 0) {
            $n = $this->billedBranches($organization);

            return "Your plan is billed for {$n} active ".str('branch')->plural($n)
                .'. Increase your branch allotment on the Plans page before adding more.';
        }

        return 'Your plan allows one branch. Upgrade to Frontdesk Pro for more branches.';
    }

    public function canAddKiosk(Organization $organization): bool
    {
        $limit = config('frontdesk.plans.'.$this->planKey($organization).'.max_kiosk_devices');
        if ($limit === null) {
            return true;
        }

        $count = Device::query()
            ->where('organization_id', $organization->id)
            ->where('type', 'kiosk')
            ->count();

        return $count < (int) $limit;
    }

    public function hasFeature(Organization $organization, string $feature): bool
    {
        $features = config('frontdesk.plans.'.$this->planKey($organization).'.features', []);

        return in_array($feature, $features, true);
    }

    public function proPricePerBranchMinor(): int
    {
        return (int) config(
            'frontdesk.plans.pro.price_minor_per_branch',
            config('frontdesk.plans.pro.price_minor', 199000),
        );
    }

    /**
     * Per-branch rate (legacy callers treated this as a flat monthly fee).
     *
     * @deprecated Prefer proPricePerBranchMinor() / priceForBranches().
     */
    public function proPriceMinor(): int
    {
        return $this->proPricePerBranchMinor();
    }

    public function enterprisePricePerBranchMinor(): int
    {
        return (int) config('frontdesk.plans.enterprise.price_minor_per_branch', 299000);
    }

    public function proPriceTotalMinor(Organization $organization): int
    {
        return $this->priceForBranches('pro', $this->activeBranchCount($organization));
    }

    public function enterprisePriceMinor(Organization $organization): int
    {
        return $this->priceForBranches('enterprise', $this->activeBranchCount($organization));
    }

    public function priceForBranches(string $plan, int $branches): int
    {
        $branches = max(1, $branches);
        $rate = $plan === 'enterprise'
            ? $this->enterprisePricePerBranchMinor()
            : $this->proPricePerBranchMinor();

        return $branches * $rate;
    }

    public function resolveCheckoutBranches(Organization $organization, int $requested): int
    {
        $branches = max(1, $requested);
        $active = max(1, $this->activeBranchCount($organization));

        return max($branches, $active);
    }

    public function canSubscribeEnterprise(Organization $organization): bool
    {
        return $this->activeBranchCount($organization) >= (int) config('frontdesk.enterprise.min_branches', 1);
    }
}