"use client";

import { useState } from 'react';

const TAG_STYLES = {
    named: { color: '#10b981', bg: '#10b98120', label: 'Named' },
    descriptive: { color: '#f59e0b', bg: '#f59e0b20', label: 'Descriptive' },
    vague: { color: '#a78bfa', bg: '#a78bfa20', label: 'Vague' },
    'non-dataset': { color: '#64748b', bg: '#64748b20', label: 'Non-Dataset' },
};

const TAG_OPTIONS = ['named', 'descriptive', 'vague', 'non-dataset'];

export default function AnnotationPanel({
    isOpen,
    onClose,
    datasets,          // ALL datasets on current page (model + human)
    annotatorName,     // current user's name
    onValidate,        // (datasetIdx, updates) => void
    onDelete,
}) {
    const [validatingIdx, setValidatingIdx] = useState(null);
    const [validationNotes, setValidationNotes] = useState('');
    const [editingTagIdx, setEditingTagIdx] = useState(null);
    const [editTag, setEditTag] = useState('');
    const [confirmDelete, setConfirmDelete] = useState(null);

    const startValidation = (idx, prefillNotes = '') => {
        setValidatingIdx(idx);
        setValidationNotes(prefillNotes);
    };

    const submitValidation = (ds, idx, verdict) => {
        onValidate(ds._rawIndex ?? idx, {
            human_validated: true,
            human_verdict: verdict,
            human_notes: validationNotes.trim() || null,
            annotator: annotatorName || 'user',
            validated_at: new Date().toISOString(),
        });
        setValidatingIdx(null);
        setValidationNotes('');
    };

    const startEditTag = (idx, currentTag) => {
        setEditingTagIdx(idx);
        setEditTag(currentTag);
    };

    const saveEditTag = (ds, idx) => {
        onValidate(ds._rawIndex ?? idx, { dataset_tag: editTag });
        setEditingTagIdx(null);
        setEditTag('');
    };

    const handleDelete = (ds, idx) => {
        if (confirmDelete === idx) {
            onDelete(ds, idx);
            setConfirmDelete(null);
        } else {
            setConfirmDelete(idx);
            setTimeout(() => setConfirmDelete(prev => prev === idx ? null : prev), 3000);
        }
    };

    return (
        <>
            {isOpen && <div className="panel-backdrop" onClick={onClose} />}

            <div className={`annotation-panel ${isOpen ? 'open' : ''}`}>
                <div className="panel-header">
                    <h3>Data Mentions</h3>
                    <span className="panel-count">{datasets.length}</span>
                    <button className="panel-close" onClick={onClose}>&times;</button>
                </div>

                <div className="panel-body">
                    {datasets.length === 0 ? (
                        <div className="panel-empty">
                            <p>No datasets detected on this page.</p>
                        </div>
                    ) : (
                        datasets.map((ds, i) => {
                            const text = ds.dataset_name?.text || '';
                            const tag = ds.dataset_tag || 'named';
                            const style = TAG_STYLES[tag] || TAG_STYLES.named;
                            const isHuman = !!ds.annotator;

                            // Per-annotator validation: look up current user's entry
                            const myValidation = (ds.validations || []).find(v => v.annotator === annotatorName);
                            const isValidated = myValidation?.human_validated === true;
                            const humanVerdict = myValidation?.human_verdict;
                            const humanNotes = myValidation?.human_notes;

                            const judgeVerdict = ds.dataset_name?.judge_verdict;
                            const judgeTag = ds.dataset_name?.judge_tag;
                            const isValidating = validatingIdx === i;
                            const isEditingTag = editingTagIdx === i;

                            return (
                                <div
                                    key={`${text}-${ds.dataset_name?.start}-${i}`}
                                    className={`panel-annotation-card ${isValidated ? (humanVerdict ? 'validated-correct' : 'validated-wrong') : ''}`}
                                >
                                    {/* Top row: tag + source */}
                                    <div className="panel-card-top">
                                        {isEditingTag ? (
                                            <div className="inline-edit">
                                                <select
                                                    className="form-select-small"
                                                    value={editTag}
                                                    onChange={(e) => setEditTag(e.target.value)}
                                                >
                                                    {TAG_OPTIONS.map(t => (
                                                        <option key={t} value={t}>
                                                            {TAG_STYLES[t]?.label || t}
                                                        </option>
                                                    ))}
                                                </select>
                                                <button className="btn-panel save" onClick={() => saveEditTag(ds, i)}>✓</button>
                                                <button className="btn-panel" onClick={() => setEditingTagIdx(null)}>✕</button>
                                            </div>
                                        ) : (
                                            <span
                                                className="annotation-tag-badge clickable"
                                                style={{ color: style.color, backgroundColor: style.bg }}
                                                onClick={() => startEditTag(i, tag)}
                                                title="Click to change tag"
                                            >
                                                {style.label}
                                            </span>
                                        )}

                                        <span className="panel-card-source">
                                            {isHuman ? `👤 ${ds.annotator}` : '🤖 model'}
                                        </span>
                                    </div>

                                    {/* Dataset text */}
                                    <p className="panel-card-text">"{text}"</p>

                                    {/* Judge info (for model extractions) */}
                                    {judgeTag && (
                                        <div className="panel-card-judge">
                                            <span className={`judge-verdict ${judgeVerdict ? 'correct' : 'wrong'}`}>
                                                Judge: {judgeVerdict ? '✓' : '✕'}
                                            </span>
                                            <span className="judge-tag">{judgeTag}</span>
                                        </div>
                                    )}

                                    {/* Position info */}
                                    {ds.dataset_name?.start != null && (
                                        <span className="panel-card-position">
                                            chars {ds.dataset_name.start}–{ds.dataset_name.end}
                                        </span>
                                    )}

                                    {/* Existing validation status (your own) */}
                                    {isValidated && (
                                        <div className={`validation-status ${humanVerdict ? 'correct' : 'wrong'}`}>
                                            {humanVerdict ? '✅ Validated correct' : '❌ Marked incorrect'}
                                            <span className="validation-by"> by you</span>
                                            {humanNotes && (
                                                <p className="validation-notes">Note: {humanNotes}</p>
                                            )}
                                        </div>
                                    )}

                                    {/* Validation UI */}
                                    {isValidating ? (
                                        <div className="validation-form">
                                            <textarea
                                                className="validation-notes-input"
                                                placeholder="Optional notes..."
                                                value={validationNotes}
                                                onChange={(e) => setValidationNotes(e.target.value)}
                                                rows={2}
                                            />
                                            <div className="validation-buttons">
                                                <button
                                                    className="btn-panel correct"
                                                    onClick={() => submitValidation(ds, i, true)}
                                                >
                                                    ✅ Correct
                                                </button>
                                                <button
                                                    className="btn-panel wrong"
                                                    onClick={() => submitValidation(ds, i, false)}
                                                >
                                                    ❌ Wrong
                                                </button>
                                                <button
                                                    className="btn-panel"
                                                    onClick={() => setValidatingIdx(null)}
                                                >
                                                    Cancel
                                                </button>
                                            </div>
                                        </div>
                                    ) : (
                                        <div className="panel-card-actions">
                                            <button
                                                className="btn-panel validate"
                                                onClick={() => startValidation(i, humanNotes || '')}
                                            >
                                                {isValidated ? '🔄 Re-validate' : '🏷️ Validate'}
                                            </button>
                                            {isHuman && (
                                                <button
                                                    className={`btn-panel delete ${confirmDelete === i ? 'confirming' : ''}`}
                                                    onClick={() => handleDelete(ds, i)}
                                                >
                                                    {confirmDelete === i ? '⚠ Confirm?' : '🗑 Delete'}
                                                </button>
                                            )}
                                        </div>
                                    )}
                                </div>
                            );
                        })
                    )}
                </div>
            </div>
        </>
    );
}