import { forwardRef, useState } from 'react'
import { Button } from '../../../Button'
import { ButtonType, ButtonSize } from '../../../Button/types'
import UnitInput from '../UnitInput'
import { UnitInputSize, UnitPosition } from '../types'
import { unitInputAccessibilityReport } from './UnitInputAccessibilityReport'
import {
    generateAccessibilityReport,
    downloadReport,
    getMimeType,
    getFileExtension,
    type ReportFormat,
} from '../../../shared/accessibility/reportGenerator'
import { Download as DownloadIcon } from 'lucide-react'

export type UnitInputAccessibilityProps = {
    className?: string
}

const UnitInputAccessibility = forwardRef<
    HTMLDivElement,
    UnitInputAccessibilityProps
>(({ className }, ref) => {
    const [selectedFormat, setSelectedFormat] =
        useState<ReportFormat>('markdown')
    const [includeTestResults, setIncludeTestResults] = useState(true)
    const [includeRecommendations, setIncludeRecommendations] = useState(true)
    const [reportHtmlContent, setReportHtmlContent] = useState<string | null>(
        null
    )
    const [showFullReport, setShowFullReport] = useState(false)

    // Demo state
    const [price, setPrice] = useState<number | undefined>(undefined)
    const [discount, setDiscount] = useState<number | undefined>(undefined)
    const [weight, setWeight] = useState<number | undefined>(undefined)

    const discountError =
        discount !== undefined && (discount < 0 || discount > 100)
            ? 'Discount must be between 0% and 100%'
            : ''

    const handleDownload = () => {
        try {
            const content = generateAccessibilityReport(
                unitInputAccessibilityReport,
                {
                    format: selectedFormat,
                    includeTestResults,
                    includeRecommendations,
                }
            )

            const filename = `unitinput-accessibility-report-${unitInputAccessibilityReport.reportDate}.${getFileExtension(selectedFormat)}`
            const mimeType = getMimeType(selectedFormat)

            downloadReport(content, filename, mimeType)
        } catch (error) {
            console.error('Error generating report:', error)
            alert('Failed to generate report. Please try again.')
        }
    }

    const handleViewReport = () => {
        try {
            const htmlContent = generateAccessibilityReport(
                unitInputAccessibilityReport,
                {
                    format: 'html',
                    includeTestResults,
                    includeRecommendations,
                }
            )
            setReportHtmlContent(htmlContent)
            setShowFullReport(true)
        } catch (error) {
            console.error('Error generating report:', error)
            alert('Failed to generate report. Please try again.')
        }
    }

    const report = unitInputAccessibilityReport
    const compliantCount = report.criteria.filter(
        (c) => c.status === 'compliant'
    ).length
    const nonCompliantCount = report.criteria.filter(
        (c) => c.status === 'non-compliant'
    ).length
    const unsureCount = report.criteria.filter(
        (c) => c.status === 'unsure'
    ).length
    const totalApplicable = report.criteria.filter(
        (c) => c.status !== 'not-applicable'
    ).length
    const complianceRate =
        totalApplicable > 0
            ? Math.round((compliantCount / totalApplicable) * 100)
            : 0

    return (
        <div ref={ref} className={className}>
            <div className="p-8 space-y-8 max-w-7xl mx-auto">
                <div className="space-y-4">
                    <div className="flex items-start justify-between">
                        <div>
                            <h1 className="text-3xl font-bold mb-1 text-gray-900">
                                UnitInput Component Accessibility
                            </h1>
                            <div className="flex items-center gap-3 text-sm text-gray-500 mb-2">
                                <span>WCAG {report.wcagVersion}</span>
                                <span>•</span>
                                <span>{report.conformanceLevel}</span>
                                <span>•</span>
                                <span>{report.reportDate}</span>
                            </div>
                            <div className="flex items-center gap-2 text-xs text-gray-400">
                                <span>Evaluates: WCAG 2.0, 2.1, 2.2</span>
                            </div>
                        </div>
                        <div className="flex gap-2">
                            <Button
                                text={
                                    showFullReport
                                        ? 'Hide Full Report'
                                        : 'View Full Report'
                                }
                                buttonType={ButtonType.PRIMARY}
                                size={ButtonSize.SMALL}
                                onClick={handleViewReport}
                            />
                            <Button
                                text="Download"
                                buttonType={ButtonType.SECONDARY}
                                size={ButtonSize.SMALL}
                                leadingIcon={<DownloadIcon size={16} />}
                                onClick={handleDownload}
                            />
                        </div>
                    </div>

                    {/* Download Options */}
                    <div className="bg-white border border-gray-200 rounded-lg p-6">
                        <h2 className="text-xl font-semibold text-gray-900 mb-4">
                            Download Report
                        </h2>
                        <div className="space-y-4">
                            <div className="flex flex-wrap gap-4">
                                <label className="flex items-center gap-2 text-sm">
                                    <input
                                        type="radio"
                                        name="format"
                                        value="markdown"
                                        checked={selectedFormat === 'markdown'}
                                        onChange={(e) =>
                                            setSelectedFormat(
                                                e.target.value as ReportFormat
                                            )
                                        }
                                    />
                                    Markdown (.md)
                                </label>
                                <label className="flex items-center gap-2 text-sm">
                                    <input
                                        type="radio"
                                        name="format"
                                        value="html"
                                        checked={selectedFormat === 'html'}
                                        onChange={(e) =>
                                            setSelectedFormat(
                                                e.target.value as ReportFormat
                                            )
                                        }
                                    />
                                    HTML (.html)
                                </label>
                                <label className="flex items-center gap-2 text-sm">
                                    <input
                                        type="radio"
                                        name="format"
                                        value="json"
                                        checked={selectedFormat === 'json'}
                                        onChange={(e) =>
                                            setSelectedFormat(
                                                e.target.value as ReportFormat
                                            )
                                        }
                                    />
                                    JSON (.json)
                                </label>
                            </div>

                            <div className="flex flex-wrap gap-4">
                                <label className="flex items-center gap-2 text-sm">
                                    <input
                                        type="checkbox"
                                        checked={includeTestResults}
                                        onChange={(e) =>
                                            setIncludeTestResults(
                                                e.target.checked
                                            )
                                        }
                                    />
                                    Include test results
                                </label>
                                <label className="flex items-center gap-2 text-sm">
                                    <input
                                        type="checkbox"
                                        checked={includeRecommendations}
                                        onChange={(e) =>
                                            setIncludeRecommendations(
                                                e.target.checked
                                            )
                                        }
                                    />
                                    Include recommendations
                                </label>
                            </div>

                            <Button
                                text="Download Report"
                                buttonType={ButtonType.PRIMARY}
                                size={ButtonSize.MEDIUM}
                                leadingIcon={<DownloadIcon size={16} />}
                                onClick={handleDownload}
                            />
                        </div>
                    </div>

                    {/* Summary Cards */}
                    <div className="grid grid-cols-1 md:grid-cols-4 gap-4">
                        <div className="bg-white border-2 border-green-200 rounded-lg p-4 shadow-sm">
                            <div className="text-2xl font-bold mb-1 text-green-600">
                                {compliantCount}
                            </div>
                            <div className="text-xs font-medium text-gray-700">
                                Compliant ✅
                            </div>
                            <div className="text-xs text-gray-500 mt-1">
                                Verified & tested
                            </div>
                        </div>
                        <div className="bg-white border-2 border-red-200 rounded-lg p-4 shadow-sm">
                            <div className="text-2xl font-bold mb-1 text-red-600">
                                {nonCompliantCount}
                            </div>
                            <div className="text-xs font-medium text-gray-700">
                                Non-Compliant ❌
                            </div>
                            <div className="text-xs text-gray-500 mt-1">
                                Issues found
                            </div>
                        </div>
                        <div className="bg-white border-2 border-orange-200 rounded-lg p-4 shadow-sm">
                            <div className="text-2xl font-bold mb-1 text-orange-600">
                                {unsureCount}
                            </div>
                            <div className="text-xs font-medium text-gray-700">
                                Unsure ⚠️
                            </div>
                            <div className="text-xs text-gray-500 mt-1">
                                Needs verification
                            </div>
                        </div>
                        <div className="bg-white border-2 border-blue-200 rounded-lg p-4 shadow-sm">
                            <div className="text-2xl font-bold mb-1 text-blue-600">
                                {complianceRate}%
                            </div>
                            <div className="text-xs font-medium text-gray-700">
                                Compliance Rate
                            </div>
                            <div className="text-xs text-gray-500 mt-1">
                                Based on verified items
                            </div>
                        </div>
                    </div>
                </div>

                {/* Full Report Viewer */}
                {showFullReport && reportHtmlContent && (
                    <section className="bg-white border-2 border-gray-300 rounded-lg p-6 shadow-lg">
                        <div className="flex items-center justify-between mb-4 pb-3 border-b border-gray-200">
                            <div>
                                <h2 className="text-xl font-bold text-gray-900">
                                    Full Accessibility Report
                                </h2>
                                <p className="text-sm text-gray-500 mt-1">
                                    Interactive HTML report (same as downloaded
                                    version)
                                </p>
                            </div>
                            <button
                                onClick={() => {
                                    setShowFullReport(false)
                                    setReportHtmlContent(null)
                                }}
                                className="px-3 py-1.5 text-sm font-medium text-gray-700 bg-gray-100 hover:bg-gray-200 rounded-md transition-colors"
                            >
                                Close
                            </button>
                        </div>
                        <div className="border border-gray-200 rounded-lg overflow-hidden bg-white">
                            <iframe
                                srcDoc={reportHtmlContent}
                                className="w-full"
                                style={{
                                    height: '700px',
                                    border: 'none',
                                }}
                                title="Accessibility Report"
                                sandbox="allow-same-origin"
                            />
                        </div>
                    </section>
                )}

                {/* Interactive Demo */}
                <div className="bg-white border border-gray-200 rounded-lg p-6">
                    <h2 className="text-xl font-semibold text-gray-900 mb-4">
                        Interactive Accessibility Demo
                    </h2>
                    <p className="text-sm text-gray-600 mb-6">
                        Test keyboard navigation (Tab, Shift+Tab), screen reader
                        announcements, numeric constraints, units, and error
                        states. All inputs have proper label associations, ARIA
                        attributes, and error handling.
                    </p>

                    <div className="space-y-6 max-w-2xl">
                        {/* Price with sublabel and hint */}
                        <UnitInput
                            label="Product Price"
                            sublabel="Base price before taxes and discounts"
                            hintText="Enter the price in US dollars"
                            unit="$"
                            unitPosition={UnitPosition.LEFT}
                            placeholder="0.00"
                            min={0}
                            step={0.01}
                            value={price}
                            onChange={(e) =>
                                setPrice(
                                    e.target.value
                                        ? parseFloat(e.target.value)
                                        : undefined
                                )
                            }
                            required
                        />

                        {/* Discount with range and error state */}
                        <UnitInput
                            label="Discount"
                            unit="%"
                            unitPosition={UnitPosition.RIGHT}
                            placeholder="0"
                            min={0}
                            max={100}
                            step={1}
                            value={discount}
                            onChange={(e) =>
                                setDiscount(
                                    e.target.value
                                        ? parseFloat(e.target.value)
                                        : undefined
                                )
                            }
                            error={!!discountError}
                            errorMessage={discountError}
                            required
                        />

                        {/* Weight with unit on right */}
                        <UnitInput
                            label="Weight"
                            unit="kg"
                            unitPosition={UnitPosition.RIGHT}
                            placeholder="0.0"
                            min={0}
                            step={0.1}
                            value={weight}
                            onChange={(e) =>
                                setWeight(
                                    e.target.value
                                        ? parseFloat(e.target.value)
                                        : undefined
                                )
                            }
                        />

                        {/* Disabled example */}
                        <UnitInput
                            label="Disabled Field"
                            unit="USD"
                            value={42}
                            onChange={() => {}}
                            disabled
                            hintText="Disabled fields are not focusable and do not submit values"
                        />

                        {/* Size variants */}
                        <div className="space-y-4">
                            <h3 className="text-sm font-medium text-gray-900">
                                Size Variants
                            </h3>
                            <UnitInput
                                label="Medium Size"
                                unit="USD"
                                placeholder="Medium unit input"
                                size={UnitInputSize.MEDIUM}
                                value={undefined}
                                onChange={() => {}}
                            />
                            <UnitInput
                                label="Large Size"
                                unit="USD"
                                placeholder="Large unit input"
                                size={UnitInputSize.LARGE}
                                value={undefined}
                                onChange={() => {}}
                            />
                        </div>
                    </div>
                </div>

                {/* Key Accessibility Features */}
                <div className="bg-white border border-gray-200 rounded-lg p-6">
                    <h2 className="text-xl font-semibold text-gray-900 mb-4">
                        Key Accessibility Features
                    </h2>
                    <div className="grid grid-cols-1 md:grid-cols-2 gap-4">
                        {report.strengths.map((strength, index) => (
                            <div
                                key={index}
                                className="flex items-start gap-2 text-sm"
                            >
                                <span className="text-green-600 mt-0.5">✓</span>
                                <span className="text-gray-700">
                                    {strength}
                                </span>
                            </div>
                        ))}
                    </div>
                </div>

                {/* WCAG Compliance Breakdown */}
                <div className="bg-white border border-gray-200 rounded-lg p-6">
                    <h2 className="text-xl font-semibold text-gray-900 mb-4">
                        WCAG Compliance Breakdown
                    </h2>
                    <div className="space-y-4">
                        {/* Level A */}
                        <div>
                            <h3 className="text-sm font-medium text-gray-900 mb-2">
                                Level A (Essential)
                            </h3>
                            <div className="flex flex-wrap gap-2">
                                {report.testMethodology.wcagLevels.A.map(
                                    (criterion, index) => {
                                        const criterionData =
                                            report.criteria.find((c) =>
                                                criterion.startsWith(c.id)
                                            )
                                        const statusColor =
                                            criterionData?.status ===
                                            'compliant'
                                                ? 'bg-green-100 text-green-800'
                                                : criterionData?.status ===
                                                    'non-compliant'
                                                  ? 'bg-red-100 text-red-800'
                                                  : criterionData?.status ===
                                                      'unsure'
                                                    ? 'bg-yellow-100 text-yellow-800'
                                                    : 'bg-gray-100 text-gray-800'
                                        return (
                                            <span
                                                key={index}
                                                className={`text-xs px-2 py-1 rounded ${statusColor}`}
                                            >
                                                {criterion.split(' ')[0]}
                                            </span>
                                        )
                                    }
                                )}
                            </div>
                        </div>

                        {/* Level AA */}
                        <div>
                            <h3 className="text-sm font-medium text-gray-900 mb-2">
                                Level AA (Recommended)
                            </h3>
                            <div className="flex flex-wrap gap-2">
                                {report.testMethodology.wcagLevels.AA.map(
                                    (criterion, index) => {
                                        const criterionData =
                                            report.criteria.find((c) =>
                                                criterion.startsWith(c.id)
                                            )
                                        const statusColor =
                                            criterionData?.status ===
                                            'compliant'
                                                ? 'bg-green-100 text-green-800'
                                                : criterionData?.status ===
                                                    'non-compliant'
                                                  ? 'bg-red-100 text-red-800'
                                                  : criterionData?.status ===
                                                      'unsure'
                                                    ? 'bg-yellow-100 text-yellow-800'
                                                    : 'bg-gray-100 text-gray-800'
                                        return (
                                            <span
                                                key={index}
                                                className={`text-xs px-2 py-1 rounded ${statusColor}`}
                                            >
                                                {criterion.split(' ')[0]}
                                            </span>
                                        )
                                    }
                                )}
                            </div>
                        </div>

                        {/* Level AAA */}
                        <div>
                            <h3 className="text-sm font-medium text-gray-900 mb-2">
                                Level AAA (Enhanced)
                            </h3>
                            <div className="flex flex-wrap gap-2">
                                {report.testMethodology.wcagLevels.AAA.map(
                                    (criterion, index) => {
                                        const criterionData =
                                            report.criteria.find((c) =>
                                                criterion.startsWith(c.id)
                                            )
                                        const statusColor =
                                            criterionData?.status ===
                                            'compliant'
                                                ? 'bg-green-100 text-green-800'
                                                : criterionData?.status ===
                                                    'non-compliant'
                                                  ? 'bg-red-100 text-red-800'
                                                  : criterionData?.status ===
                                                      'unsure'
                                                    ? 'bg-yellow-100 text-yellow-800'
                                                    : 'bg-gray-100 text-gray-800'
                                        return (
                                            <span
                                                key={index}
                                                className={`text-xs px-2 py-1 rounded ${statusColor}`}
                                            >
                                                {criterion.split(' ')[0]}
                                            </span>
                                        )
                                    }
                                )}
                            </div>
                        </div>
                    </div>
                </div>

                {/* Recommendations */}
                <div className="bg-white border border-gray-200 rounded-lg p-6">
                    <h2 className="text-xl font-semibold text-gray-900 mb-4">
                        Recommendations
                    </h2>
                    <div className="space-y-3">
                        {report.recommendations.map((recommendation, index) => (
                            <div
                                key={index}
                                className="flex items-start gap-2 text-sm"
                            >
                                <span className="text-blue-600 mt-0.5">→</span>
                                <span className="text-gray-700">
                                    {recommendation}
                                </span>
                            </div>
                        ))}
                    </div>
                </div>
            </div>
        </div>
    )
})

UnitInputAccessibility.displayName = 'UnitInputAccessibility'

export default UnitInputAccessibility