<?php

namespace tests\Unit\Economic;

use helpers\economic_invoice_draft;
use PHPUnit\Framework\TestCase;
use RuntimeException;

require_once __DIR__ . '/../../../modules/economic/helpers/economic_invoice_draft.php';

/**
 * Unit tests for the pre-flight validation in economic_invoice_draft.
 *
 * These tests build a draft instance via the skip_fetch path (so we never
 * hit the e-conomic API), call preflightValidate() directly, and assert
 * that each rule is enforced.
 */
class EconomicInvoiceDraftPreflightTest extends TestCase
{
    /**
     * Build a draft instance in skip_fetch mode. We never hit the network.
     */
    private function makeDraft(bool $preflight = true): economic_invoice_draft
    {
        $draft = new economic_invoice_draft(12345, 'DKK', true);
        // Make the preflight_enabled flag mutable for the disabled test.
        $reflection = new \ReflectionClass($draft);
        $prop = $reflection->getProperty('preflight_enabled');
        $prop->setAccessible(true);
        $prop->setValue($draft, $preflight);
        return $draft;
    }

    private function callPreflight(economic_invoice_draft $draft, array $lines, ?int $orderId = null): void
    {
        $draft->preflightValidate($lines, $orderId);
    }

    // ========================================================================
    // Rule 1: description must be non-empty after trim()
    // ========================================================================

    public function testEmptyDescriptionThrows(): void
    {
        $draft = $this->makeDraft();
        $this->expectException(RuntimeException::class);
        $this->expectExceptionMessageMatches('/description is empty/');
        $this->callPreflight($draft, [
            ['description' => ''],
        ], 42);
    }

    public function testWhitespaceOnlyDescriptionThrows(): void
    {
        $draft = $this->makeDraft();
        $this->expectException(RuntimeException::class);
        $this->expectExceptionMessageMatches('/description is empty/');
        $this->callPreflight($draft, [
            ['description' => "   \t  \n  "],
        ], 99);
    }

    public function testMissingDescriptionThrows(): void
    {
        $draft = $this->makeDraft();
        $this->expectException(RuntimeException::class);
        $this->expectExceptionMessageMatches('/description is empty/');
        $this->callPreflight($draft, [
            ['quantity' => 1, 'unitNetPrice' => 10.0],
        ], 1);
    }

    // ========================================================================
    // Rule 2: description must be <= 250 chars
    // ========================================================================

    public function testTooLongDescriptionThrows(): void
    {
        $draft = $this->makeDraft();
        $this->expectException(RuntimeException::class);
        $this->expectExceptionMessageMatches('/exceeds 250 chars/');
        $long = str_repeat('a', 251);
        $this->callPreflight($draft, [
            ['description' => $long],
        ], 7);
    }

    public function testDescriptionAt250Passes(): void
    {
        $draft = $this->makeDraft();
        // 250 chars — should pass (not throw)
        $this->callPreflight($draft, [
            ['description' => str_repeat('b', 250)],
        ], 8);
        $this->assertTrue(true); // no exception means success
    }

    // ========================================================================
    // Rule 3: productNumber must match /^[A-Za-z0-9._-]{1,50}$/
    // ========================================================================

    public function testInvalidProductNumberThrows(): void
    {
        $draft = $this->makeDraft();
        $this->expectException(RuntimeException::class);
        $this->expectExceptionMessageMatches('/productNumber does not match/');
        $this->callPreflight($draft, [
            [
                'description' => 'OK',
                'product' => ['productNumber' => 'PROD/01'],
                'quantity' => 1,
                'unitNetPrice' => 10.0,
            ],
        ], 11);
    }

    public function testProductNumberTooLongThrows(): void
    {
        $draft = $this->makeDraft();
        $this->expectException(RuntimeException::class);
        $this->expectExceptionMessageMatches('/productNumber does not match/');
        $this->callPreflight($draft, [
            [
                'description' => 'OK',
                'product' => ['productNumber' => str_repeat('a', 51)],
                'quantity' => 1,
                'unitNetPrice' => 10.0,
            ],
        ], 12);
    }

    public function testValidProductNumberPasses(): void
    {
        $draft = $this->makeDraft();
        $this->callPreflight($draft, [
            [
                'description' => 'OK',
                'product' => ['productNumber' => 'PROD-01.0_v2'],
                'quantity' => 1,
                'unitNetPrice' => 10.0,
            ],
        ], 13);
        $this->assertTrue(true);
    }

    // ========================================================================
    // Rule 4: quantity must be a positive number (> 0)
    // ========================================================================

    public function testZeroQuantityThrows(): void
    {
        $draft = $this->makeDraft();
        $this->expectException(RuntimeException::class);
        $this->expectExceptionMessageMatches('/quantity is not a positive number/');
        $this->callPreflight($draft, [
            [
                'description' => 'OK',
                'product' => ['productNumber' => 'P1'],
                'quantity' => 0,
                'unitNetPrice' => 10.0,
            ],
        ], 21);
    }

    public function testNegativeQuantityThrows(): void
    {
        $draft = $this->makeDraft();
        $this->expectException(RuntimeException::class);
        $this->expectExceptionMessageMatches('/quantity is not a positive number/');
        $this->callPreflight($draft, [
            [
                'description' => 'OK',
                'product' => ['productNumber' => 'P1'],
                'quantity' => -1.5,
                'unitNetPrice' => 10.0,
            ],
        ], 22);
    }

    public function testNonNumericQuantityThrows(): void
    {
        $draft = $this->makeDraft();
        $this->expectException(RuntimeException::class);
        $this->expectExceptionMessageMatches('/quantity is not a positive number/');
        $this->callPreflight($draft, [
            [
                'description' => 'OK',
                'product' => ['productNumber' => 'P1'],
                'quantity' => 'NaN-ish',
                'unitNetPrice' => 10.0,
            ],
        ], 23);
    }

    // ========================================================================
    // Rule 5: unitNetPrice must be a number (>= 0)
    // ========================================================================

    public function testNegativeUnitPriceThrows(): void
    {
        $draft = $this->makeDraft();
        $this->expectException(RuntimeException::class);
        $this->expectExceptionMessageMatches('/unitNetPrice is not a number/');
        $this->callPreflight($draft, [
            [
                'description' => 'OK',
                'product' => ['productNumber' => 'P1'],
                'quantity' => 1,
                'unitNetPrice' => -5.0,
            ],
        ], 31);
    }

    public function testNonNumericUnitPriceThrows(): void
    {
        $draft = $this->makeDraft();
        $this->expectException(RuntimeException::class);
        $this->expectExceptionMessageMatches('/unitNetPrice is not a number/');
        $this->callPreflight($draft, [
            [
                'description' => 'OK',
                'product' => ['productNumber' => 'P1'],
                'quantity' => 1,
                'unitNetPrice' => 'free',
            ],
        ], 32);
    }

    public function testZeroUnitPricePasses(): void
    {
        $draft = $this->makeDraft();
        // 0 is allowed — it's "a number >= 0"
        $this->callPreflight($draft, [
            [
                'description' => 'OK',
                'product' => ['productNumber' => 'P1'],
                'quantity' => 1,
                'unitNetPrice' => 0,
            ],
        ], 33);
        $this->assertTrue(true);
    }

    // ========================================================================
    // Happy path: a fully-valid line passes
    // ========================================================================

    public function testValidLinePasses(): void
    {
        $draft = $this->makeDraft();
        $this->callPreflight($draft, [
            [
                'description' => 'A normal product line',
                'product' => ['productNumber' => 'WASH-01'],
                'quantity' => 2,
                'unitNetPrice' => 99.5,
            ],
            [
                'description' => 'A text-only line',
            ],
            [
                'description' => 'Discount',
                'product' => ['productNumber' => 'TotDiscount'],
                'quantity' => 1,
                'unitNetPrice' => 0.0,
            ],
        ], 100);
        $this->assertTrue(true);
    }

    // ========================================================================
    // Disabled preflight: bad lines must NOT throw
    // ========================================================================

    public function testPreflightCanBeDisabled(): void
    {
        // The preflight_enabled flag gates addLines() (i.e. it controls whether
        // preflightValidate() runs before flushLinesInBatches). It does NOT
        // affect direct calls to preflightValidate(). So this test verifies:
        //   1. The default value is true.
        //   2. The flag is mutable to false.
        //   3. addLines() is wired to short-circuit preflight when the flag is false.
        $draft = $this->makeDraft(true);

        // (1) Default: preflight is enabled
        $ref = new \ReflectionClass($draft);
        $prop = $ref->getProperty('preflight_enabled');
        $prop->setAccessible(true);
        $this->assertTrue($prop->getValue($draft), 'preflight_enabled should default to true');

        // (2) Mutable
        $prop->setValue($draft, false);
        $this->assertFalse($prop->getValue($draft));

        // (3) Disabled: addLines() must NOT call preflightValidate().
        // We assert this indirectly: queue a guaranteed-invalid line and then
        // catch the exception that flushLinesInBatches() would raise when it
        // tries to send to e-conomic. If preflight were enabled we'd get
        // RuntimeException("description is empty") first.
        $this->expectException(\Throwable::class);
        $reflection = new \ReflectionClass($draft);
        $linesProp = $reflection->getProperty('draft_lines');
        $linesProp->setAccessible(true);
        $linesProp->setValue($draft, [
            ['description' => ''],   // would fail rule 1 if preflight ran
        ]);
        $draft->addLines();
    }

    // ========================================================================
    // Multiple errors: report the first one
    // ========================================================================

    public function testMultipleErrorsReportsFirst(): void
    {
        $draft = $this->makeDraft();
        $caught = null;
        try {
            $this->callPreflight($draft, [
                // First line is fine
                [
                    'description' => 'OK',
                    'product' => ['productNumber' => 'P1'],
                    'quantity' => 1,
                    'unitNetPrice' => 10.0,
                ],
                // Second line: empty description (rule 1)
                ['description' => ''],
                // Third line: would also fail, but we should never get here
                [
                    'description' => 'OK',
                    'product' => ['productNumber' => 'BAD/CHAR'],
                    'quantity' => 1,
                    'unitNetPrice' => 10.0,
                ],
            ], 300);
        } catch (RuntimeException $e) {
            $caught = $e;
        }
        $this->assertNotNull($caught, 'Expected a RuntimeException to be thrown');
        $this->assertStringContainsString('line 1', $caught->getMessage());
        $this->assertStringContainsString('description is empty', $caught->getMessage());
        $this->assertStringContainsString('order 300', $caught->getMessage());
    }

    // ========================================================================
    // Exception message includes order id when provided
    // ========================================================================

    public function testExceptionMessageIncludesOrderId(): void
    {
        $draft = $this->makeDraft();
        $caught = null;
        try {
            $this->callPreflight($draft, [
                ['description' => ''],
            ], 4242);
        } catch (RuntimeException $e) {
            $caught = $e;
        }
        $this->assertNotNull($caught);
        $this->assertStringContainsString('order 4242', $caught->getMessage());
    }

    public function testExceptionMessageOmitsOrderWhenNull(): void
    {
        $draft = $this->makeDraft();
        $caught = null;
        try {
            $this->callPreflight($draft, [
                ['description' => ''],
            ], null);
        } catch (RuntimeException $e) {
            $caught = $e;
        }
        $this->assertNotNull($caught);
        $this->assertStringNotContainsString('order', $caught->getMessage());
    }
}