<?php

namespace FluentCart\App\Http\Requests;

use FluentCart\App\Helpers\Helper;
use FluentCart\App\Models\ProductVariation;
use FluentCart\App\Models\ShippingClass;
use FluentCart\App\Modules\FluentPlayer\ProductVideoSettings;
use FluentCart\App\Services\DateTime\DateTime;
use FluentCart\App\Http\Rules\RequiredWhenRule;
use FluentCart\Framework\Foundation\RequestGuard;
use FluentCart\Framework\Support\Arr;

class ProductUpdateRequest extends RequestGuard
{
    /**
     * Drop the subscription fields from any variant saved as one-time, so a
     * product switched back to a single payment does not keep billing settings
     * the merchant can no longer see.
     *
     * This does NOT fill missing keys. The block below it — which rebuilt
     * `other_info` and `fulfillment_type` from defaults, as ProductRequest still
     * does on create — stays commented out deliberately: on an update the payload
     * is a partial row, so rebuilding the column from defaults would overwrite a
     * stored subscription's interval and setup fee on an unrelated edit. Callers
     * therefore have to send a complete variant row; the editor builds one in
     * Models/Product/productUpdatePayload.js by merging each change record with
     * the variation it came from.
     *
     * @return array The request data, with dead subscription fields removed.
     */
    public function beforeValidation()
    {
        $data = $this->all();

        $subscriptionFields = ['trial_days', 'times', 'repeat_interval', 'billing_summary', 'manage_setup_fee', 'signup_fee', 'signup_fee_name', 'setup_fee_per_item'];
        foreach (Arr::get($data, 'variants', []) as $index => $variant) {
            if (Arr::get($variant, 'other_info.payment_type') === 'onetime') {
                foreach ($subscriptionFields as $field) {
                    unset($data['variants'][$index]['other_info'][$field]);
                }
            }
        }

        return $data;
//
//        $fulfilmentType = Arr::get(
//            $data,
//            'detail.fulfillment_type',
//            Arr::get($data, 'detail.fulfillment_type', 'physical')
//        );
//
//        $variants = Arr::wrap(
//            Arr::get($data, 'variants', [])
//        );
//
//        foreach ($variants as $index => &$variant) {
//            $variant['fulfillment_type'] = $variant['fulfillment_type'] ?? $fulfilmentType;
//
//            $variant['other_info'] = Arr::wrap(Arr::get($variant, 'other_info')) ?? [];
//
//            // get payment_type from $variant
//            $paymentType = Arr::get($variant, 'other_info.payment_type', 'onetime');
//
//            $variant['shipping_class'] = Arr::get($variant, 'shipping_class', null);
//
//            $variant['other_info'] = [
//                'payment_type'       => $paymentType,
//                'times'              => Arr::get($variant, 'other_info.times', ''),
//                'trial_days'         => Arr::get($variant, 'other_info.trial_days', ''),
//                //'purchasable'        => Arr::get($variant, 'other_info.purchasable', ''),
//                'repeat_interval'    => Arr::get($variant, 'other_info.repeat_interval', 'yearly'),
//                'billing_summary'    => Arr::get($variant, 'other_info.billing_summary', ''),
//                'manage_setup_fee'   => Arr::get($variant, 'other_info.manage_setup_fee', 'no'),
//                'signup_fee_name'    => Arr::get($variant, 'other_info.signup_fee_name', ''),
//                'signup_fee'         => Arr::get($variant, 'other_info.signup_fee', ''),
//                'setup_fee_per_item' => Arr::get($variant, 'other_info.setup_fee_per_item', 'no'),
//                'installment'        => Arr::get($variant, 'other_info.installment', 'no'),
//            ];
//
//            $data['variants'][$index] = $variant;
//        }
//
//        return $data;
    }

    function validateShippingClassId($attribute, $value): ?string
    {
        static $checked = [];

        if (empty($value)) {
            return null;
        }

        // Return cached result if we've already checked this value
        if (isset($checked[$value])) {
            return $checked[$value];
        }

        if (!is_numeric($value)) {
            $checked[$value] = __("Invalid Shipping Class.", 'fluent-cart');
            return $checked[$value];
        }

        if (empty(ShippingClass::query()->find($value))) {
            $checked[$value] = __("Invalid Shipping Class.", 'fluent-cart');
            return $checked[$value];
        }

        return null;

    }

    function validateTaxClassId($attribute, $value): ?string
    {
        static $checked = [];

        if (empty($value)) {
            return null;
        }

        // Return cached result if we've already checked this value
        if (isset($checked[$value])) {
            return $checked[$value];
        }

        if (!is_numeric($value)) {
            $checked[$value] = __("Invalid Tax Class.", 'fluent-cart');
            return $checked[$value];
        }

        if (empty(\FluentCart\App\Models\TaxClass::query()->find($value))) {
            $checked[$value] = __("Invalid Tax Class.", 'fluent-cart');
            return $checked[$value];
        }

        return null;

    }

    function validateTaxClassSlug($attribute, $value): ?string
    {
        static $checked = [];

        if (empty($value)) {
            return null;
        }

        $value = sanitize_text_field($value);

        if (isset($checked[$value])) {
            return $checked[$value];
        }

        if (empty(\FluentCart\App\Models\TaxClass::query()->where('slug', $value)->first())) {
            $checked[$value] = __("Invalid Tax Class.", 'fluent-cart');
            return $checked[$value];
        }

        return null;
    }

    public function validatePostDate($attribute, $value): ?string
    {
        if ($this->get('post_status') !== 'future') {
            return null;
        }

        if (empty($value)) {
            return __("The post date is required when status is scheduled.", 'fluent-cart');
        }
        $currentTime = DateTime::gmtNow();
        try {
            $postDate = DateTime::anyTimeToGmt($value);
        } catch (\Exception $exception) {
            return __("The post date is invalid.", 'fluent-cart');
        }

        if ($postDate < $currentTime) {
            return sprintf(__("The post date must be in the future.", 'fluent-cart'));
        }
        return null;
    }


    /**
     * @return array
     */
    public function rules(): array
    {
        $data = $this->all();
        $hasDetail   = isset($data['detail']) && is_array($data['detail']);
        $hasVariants = isset($data['variants']) && is_array($data['variants']);

        if (!$hasDetail && !$hasVariants) {
            $rules = [];
            if (isset($data['post_title'])) {
                $rules['post_title'] = 'sanitizeText|maxLength:200';
            }
            if (isset($data['post_excerpt'])) {
                $rules['post_excerpt'] = ['nullable', 'string'];
            }
            if (isset($data['post_status'])) {
                $rules['post_status'] = ['string', function ($attribute, $value) {
                    if (!in_array($value, ['publish', 'draft', 'future', 'private'], true)) {
                        return __('Invalid post status provided.', 'fluent-cart');
                    }
                    return null;
                }];
            }
            if (isset($data['post_status']) && $data['post_status'] === 'future') {
                $rules['post_date'] = function ($attribute, $value) {
                    return $this->validatePostDate($attribute, $value);
                };
            }
            return $rules;
        }

        $variationType = Arr::get($data, 'detail.variation_type', 'simple');
        $rules = [
            'post_title'                          => 'required|sanitizeText|maxLength:200',
            'post_excerpt'                        => [
                'nullable',
                'string',
                'validate_excerpt' => function ($attr, $value) {
                    $words = explode(' ', $value);
                    $excerpt_length = (int)apply_filters('excerpt_length', 55);
                    if (count($words) > $excerpt_length) {
                        return sprintf(
                            /* translators: %d: The maximum number of words allowed */
                            __("The excerpt field cannot contain more than %d words.", 'fluent-cart'),
                            $excerpt_length
                        );
                    }
                    return null;
                }
            ],
            'post_status'                         => ['required', 'string'],
            'post_date'                           => function ($attribute, $value) {
                return $this->validatePostDate($attribute, $value);
            },
            'comment_status'                      => 'nullable|sanitizeText|maxLength:100',
            'detail.fulfillment_type'             => 'required|sanitizeText|maxLength:100',
            'detail.variation_type'               => 'required|sanitizeText|maxLength:100',
            'detail.min_price'                    => 'nullable|numeric',
            'detail.max_price'                    => 'nullable|numeric',
            'detail.stock_availability'           => 'nullable|sanitizeText',
            'detail.manage_stock'                 => 'nullable|numeric',
            'detail.manage_downloadable'          => 'nullable|numeric',
            'detail.other_info'                   => 'nullable|array',
            'detail.other_info.group_pricing_by'  => 'nullable|sanitizeText|in:payment_type,repeat_interval,none',
            'detail.other_info.sold_individually'  => 'nullable|sanitizeText|in:yes,no',
            'detail.other_info.use_pricing_table' => 'nullable|sanitizeText',
            'detail.other_info.shipping_class'    => ['nullable', function ($attribute, $value) {
                return $this->validateShippingClassId($attribute, $value);
            }],
            'detail.other_info.tax_class'         => ['nullable', function ($attribute, $value) {
                return $this->validateTaxClassId($attribute, $value);
            }],
            'detail.other_info.tax_exempt'        => 'nullable|sanitizeText|in:yes,no',
            'detail.other_info.active_editor'     => 'nullable|sanitizeText',
            'detail.other_info.fluent_player_video' => 'nullable|array',
            'product_terms'                       => 'nullable|array',
            'product_terms.*'                     => 'nullable|array',
            'product_terms.*.*'                   => 'nullable|numeric',

            // 'variants' => 'required_if:post_status,publish,future',
            'variants.*.variation_title'          => 'required|sanitizeText|maxLength:200',
            'variants.*.fulfillment_type'         => ['sanitizeText', function ($attribute, $value) {
                if (!in_array($value, ['physical', 'digital'])) {
                    return __('Invalid fulfillment type.', 'fluent-cart');
                }
                return null;
            }],
            'variants.*.post_id'                  => 'required|numeric',
            'variants.*.item_price'               => 'nullable|numeric|min:0',
            'variants.*.compare_price'            => [
                'nullable',
                'numeric',
                function ($attribute, $value) {
                    // Zero or empty means no compare-at price, which the storefront
                    // also treats as "none" — nothing to compare.
                    if ($value === null || $value === '' || (float) $value <= 0) {
                        return null;
                    }

                    $index = explode('.', $attribute)[1];
                    $itemPrice = $this->get("variants.$index.item_price");

                    // The editor posts only what changed, so a compare-price-only edit
                    // carries no item_price. Falling back to 0 made the comparison
                    // vacuous and the rule passed for any value; read the stored price
                    // for that variation instead, which is what the row is really
                    // being compared against.
                    if ($itemPrice === null || $itemPrice === '') {
                        $variantId = $this->get("variants.$index.id");

                        $itemPrice = $variantId
                            ? ProductVariation::query()->where('id', $variantId)->value('item_price')
                            : 0;
                    }

                    if ((float) $value < (float) $itemPrice) {
                        return sprintf(__("Compare price must be greater than or equal to item price.", 'fluent-cart'));
                    }

                    return null;
                },
            ],
            'variants.*.manage_cost'              => 'nullable|sanitizeText|maxLength:10',
            // Variant tax classes are stored as slugs, not numeric IDs like the
            // older product-detail tax field.
            'variants.*.other_info.tax_class'     => ['nullable', function ($attribute, $value) {
                return $this->validateTaxClassSlug($attribute, $value);
            }],
            'variants.*.other_info.tax_exempt'    => 'nullable|sanitizeText|in:yes,no',
//            'variants.*.shipping_class'           => ['nullable', 'numeric', function ($attribute, $value) {
//                return $this->validateShippingClassId($attribute, $value);
//            }],
//            'variants.*.item_cost'                => 'required_if:variants.*.manage_cost,true',
            'variants.*.serial_index'             => 'nullable|numeric',
//            'variants.*.downloadable' => 'nullable|sanitizeText|maxLength:10',
            // Outside the variation_type gate below: the other_info rules there only
            // register for 'simple', but a simple_variations save posts variants too.
            'variants.*.other_info.times'         => [
                function ($attribute, $value) {
                    $index = explode('.', $attribute)[1];

                    return Helper::installmentTimesError($this->get("variants.$index.other_info"));
                },
            ],
        ];

        if ($variationType === 'simple') {
            $variantsOtherInfoRules = [

                'variants.*.other_info'                  => 'required|array',
                'variants.*.other_info.description'      => 'nullable|sanitizeTextArea|maxLength:255',
                'variants.*.other_info.payment_type'     => 'required|sanitizeText|in:onetime,subscription',
                'variants.*.other_info.times'            => [
                    function ($attribute, $value) {
                        $index = explode('.', $attribute)[1];
                        if ($this->get("variants.$index.other_info.payment_type") !== 'subscription') {
                            return null;
                        }
                        if (!empty($value) && !is_numeric($value)) {
                            return __('Times must be a number.', 'fluent-cart');
                        }
                        return Helper::installmentTimesError($this->get("variants.$index.other_info"));
                    },
                ],
                'variants.*.other_info.trial_days'       => [
                    function ($attribute, $value) {
                        $index = explode('.', $attribute)[1];
                        if ($this->get("variants.$index.other_info.payment_type") !== 'subscription') {
                            return null;
                        }
                        if (!empty($value) && !is_numeric($value)) {
                            return __('Trial days must be a number.', 'fluent-cart');
                        }
                        if (!empty($value) && $value > 365) {
                            return __('Trial period cannot exceed 365 days.', 'fluent-cart');
                        }
                        return null;
                    },
                ],
                'variants.*.other_info.repeat_interval'  => [
                    RequiredWhenRule::make(
                        'variants.*.other_info.payment_type',
                        'subscription',
                        esc_html__('Interval is required.', 'fluent-cart')
                    ),
                    'sanitizeText',
                    'maxLength:100',
                ],
                'variants.*.other_info.billing_summary'  => 'nullable|sanitizeTextArea|maxLength:255',
                'variants.*.other_info.manage_setup_fee' => [
                    RequiredWhenRule::make(
                        'variants.*.other_info.payment_type',
                        'subscription',
                        esc_html__('Setup Fee option is required.', 'fluent-cart')
                    ),
                    'sanitizeText',
                    'maxLength:100',
                ],
                'variants.*.other_info.signup_fee'       => [
                    RequiredWhenRule::make(
                        'variants.*.other_info.manage_setup_fee',
                        'yes',
                        esc_html__('Setup Fee Amount is required.', 'fluent-cart')
                    ),
                ],
                'variants.*.other_info.signup_fee_name'  => [
                    RequiredWhenRule::make(
                        'variants.*.other_info.manage_setup_fee',
                        'yes',
                        esc_html__('Setup Fee Name is required.', 'fluent-cart')
                    ),
                    'sanitizeText',
                    'maxLength:100',
                ],
            ];
            $rules = array_merge($rules, $variantsOtherInfoRules);

        }


//        $stockValidations = [
//            'variants.*.manage_stock'             => 'nullable|numeric',
//            'variants.*.stock_status'             => 'required_if:detail.manage_stock,1|sanitizeText|maxLength:50',
//            'variants.*.total_stock'              => 'required|numeric',
//            'variants.*.available'                => 'required|numeric',
//            'variants.*.committed'                => 'required|numeric',
//            'variants.*.on_hold'                  => 'required|numeric',
//        ];
//
//        if($this->get('detail.manage_stock') == 1) {
//            $rules = array_merge($rules, $stockValidations);
//        }
        return $rules;
    }

    public function afterValidation($validator): array
    {
        $data = $this->get();
        foreach (Arr::get($data, 'variants', []) as $index => &$variant) {
            if (empty($variant['item_price'])) {
                $variant['item_price'] = 0;
            }
        }
        return $data;
    }


    /**
     * @return array
     */
    public function messages(): array
    {
        $messages = [
            'post_title.required'                 => esc_html__('Title is required.', 'fluent-cart'),
            'post_title.max'                      => esc_html__('Title may not be greater than 200 characters.', 'fluent-cart'),
            'detail.fulfillment_type.required'    => esc_html__('Fulfilment Type is required.', 'fluent-cart'),
            'detail.variation_type.required'      => esc_html__('Variation Type is required.', 'fluent-cart'),
            'variants.required_if'                => esc_html__('Pricing is required when status is publish or scheduled.', 'fluent-cart'),
            'variants.*.variation_title.required' => esc_html__('Title is required.', 'fluent-cart'),
            'variants.*.variation_title.max'      => esc_html__('Title may not be greater than 200 characters.', 'fluent-cart'),
            'variants.*.item_price.required'      => esc_html__('Price is required.', 'fluent-cart'),
            'variants.*.item_price.numeric'       => esc_html__('Price must be a number.', 'fluent-cart'),
            'variants.*.item_price.min'           => esc_html__('Price must be a positive number greater than 0.', 'fluent-cart'),

        ];

        $variationType = Arr::get($this->all(), 'detail.variation_type', 'simple');
        if ($variationType === 'simple') {
            $otherInfoMessages = [
                'variants.*.stock_status.required_if'               => esc_html__('Stock status is required.', 'fluent-cart'),
                'variants.*.item_cost.required_if'                  => esc_html__('Item cost is required.', 'fluent-cart'),
                'variants.*.other_info.description.max'             => esc_html__('Description may not be greater than 255 characters.', 'fluent-cart'),
                'variants.*.other_info.payment_type.required'       => esc_html__('Payment Type is required.', 'fluent-cart'),
                'variants.*.other_info.times.required_if'           => esc_html__('Times is required.', 'fluent-cart'),
            ];

            $messages = array_merge($messages, $otherInfoMessages);
        }

        return $messages;
    }


    /**
     * @return array
     */
    public function sanitize(): array
    {
        return $this->getSanitizersForExistingFields();
    }

    /**
     * Only return sanitizers for fields that actually exist in the request
     *
     * @return array
     */
    private function getSanitizersForExistingFields(): array
    {
        $data = $this->all();
        $sanitizers = [];

        // Basic fields
        $basicFieldMap = [
            'ID'             => 'intval',
            'post_title'     => 'sanitize_text_field',
            'post_name'      => 'sanitize_text_field',
            'post_status'    => 'sanitize_text_field',
            'comment_status' => 'sanitize_text_field',
            'post_date'      => 'sanitize_text_field',
            'post_excerpt'   => 'wp_strip_all_tags',
            'post_content'   => 'wp_kses_post',
            'metaValue'      => function ($value) { return $value; },
        ];

        foreach ($basicFieldMap as $field => $sanitizer) {
            if (array_key_exists($field, $data)) {
                $sanitizers[$field] = $sanitizer;
            }
        }

        // Detail fields
        if (isset($data['detail']) && is_array($data['detail'])) {
            $detailFieldMap = [
                'detail.id'                           => 'intval',
                'detail.post_id'                      => 'intval',
                'detail.fulfillment_type'             => 'sanitize_text_field',
                'detail.variation_type'               => 'sanitize_key',
                'detail.stock_availability'           => 'sanitize_key',
                'detail.manage_stock'                 => 'intval',
                'detail.manage_downloadable'          => 'intval',
                'detail.default_variation_id'         => 'intval',
                'detail.other_info.group_pricing_by'  => 'sanitize_text_field',
                'detail.other_info.sold_individually' => 'sanitize_text_field',
                'detail.other_info.use_pricing_table' => 'sanitize_text_field',
                'detail.other_info.shipping_class'    => 'intval',
                'detail.other_info.tax_class'         => 'intval',
                'detail.other_info.tax_exempt'        => 'sanitize_text_field',
                'detail.other_info.active_editor'     => 'sanitize_text_field',
                'detail.other_info.fluent_player_video' => function ($value) {
                    return ProductVideoSettings::sanitize($value);
                },
            ];

            foreach ($detailFieldMap as $field => $sanitizer) {
                if (Arr::has($data, $field)) {
                    $sanitizers[$field] = $sanitizer;
                }
            }
        }

        // Product terms
        if (isset($data['product_terms']) && is_array($data['product_terms'])) {
            $sanitizers['product_terms.*.product-categories'] = 'sanitize_text_field';
            $sanitizers['product_terms.*.product-brands'] = 'sanitize_text_field';
        }

        // Gallery
        if (isset($data['gallery']) && is_array($data['gallery'])) {
            $sanitizers['gallery.*.id'] = 'intval';
            $sanitizers['gallery.*.url'] = function ($value) {
                return empty($value) ? '' : sanitize_url($value);
            };
            $sanitizers['gallery.*.title'] = 'sanitize_text_field';
        }

        // Variants
        if (isset($data['variants']) && is_array($data['variants'])) {
            foreach ($data['variants'] as $index => $variant) {
                $variantFieldMap = [
                    "variants.$index.id"               => 'intval',
                    "variants.$index.rowId"            => 'intval',
                    "variants.$index.post_id"          => 'intval',
                    "variants.$index.variation_title"  => 'sanitize_text_field',
                    "variants.$index.item_price"       => 'floatval',
                    "variants.$index.compare_price"    => 'floatval',
                    "variants.$index.item_cost"        => 'floatval',
                    "variants.$index.manage_cost"      => 'sanitize_text_field',
                    "variants.$index.total_stock"      => 'intval',
                    "variants.$index.available"        => 'intval',
                    "variants.$index.shipping_class"   => function ($value) {
                        return $value ? intval($value) : null;
                    },
                    "variants.$index.committed"        => 'intval',
                    "variants.$index.on_hold"          => 'intval',
                    "variants.$index.manage_stock"     => 'intval',
                    "variants.$index.stock_status"     => 'sanitize_key',
                    "variants.$index.serial_index"     => 'intval',
                    "variants.$index.downloadable"     => 'sanitize_text_field',
                    "variants.$index.fulfillment_type"  => 'sanitize_text_field',
                    "variants.$index.sku"  => function ($value) {
                        // empty() treats the string "0" as empty too, which would silently
                        // convert a legitimate sku of "0" to NULL — sku is a textual
                        // identifier (VARCHAR), not a numeric flag. Match the explicit
                        // '' / null check ProductResource::update() already uses for the
                        // same reason when it clears a sku.
                        return ($value === '' || $value === null) ? null : sanitize_text_field($value);
                    },
                ];

                foreach ($variantFieldMap as $field => $sanitizer) {
                    if (Arr::has($data, $field)) {
                        $sanitizers[$field] = $sanitizer;
                    }
                }

                // Variant media
                if (isset($variant['media']) && is_array($variant['media'])) {
                    $sanitizers["variants.$index.media.*.id"] = 'intval';
                    $sanitizers["variants.$index.media.*.url"] = function ($value) {
                        return empty($value) ? '' : sanitize_url($value);
                    };
                    $sanitizers["variants.$index.media.*.title"] = 'sanitize_text_field';
                }

                // Variant other_info
                if (isset($variant['other_info'])) {
                    $sanitizers["variants.$index.other_info"] = function ($value) {
                        return is_array($value) ? $value : [];
                    };

                    if (is_array($variant['other_info'])) {
                        $otherInfoFieldMap = [
                            "variants.$index.other_info.description"      => function ($value) { return $value; },
                            "variants.$index.other_info.payment_type"     => 'sanitize_text_field',
                            "variants.$index.other_info.times"            => 'sanitize_text_field',
                            "variants.$index.other_info.repeat_interval"  => 'sanitize_text_field',
                            "variants.$index.other_info.billing_summary"  => 'sanitize_text_field',
                            "variants.$index.other_info.manage_setup_fee" => 'sanitize_text_field',
                            "variants.$index.other_info.signup_fee"       => 'floatval',
                            "variants.$index.other_info.signup_fee_name"  => 'sanitize_text_field',
                            "variants.$index.other_info.installment"      => 'sanitize_text_field',
                            "variants.$index.other_info.tax_class"        => 'sanitize_text_field',
                            "variants.$index.other_info.tax_exempt"       => 'sanitize_text_field',
                        ];

                        foreach ($otherInfoFieldMap as $field => $sanitizer) {
                            if (Arr::has($data, $field)) {
                                $sanitizers[$field] = $sanitizer;
                            }
                        }
                    }
                }
            }
        }

        return $sanitizers;
    }
}