// AdminScopeToggle.js
// Multi-select BU scope picker for Admin users.
// Allows selecting any combination of teams to filter Reporting/Compliance/Exports.
// "My Teams" preset selects the admin's assigned bu_teams.
// "All BUs" preset selects everything.
// Custom selections are persisted in localStorage.

import React, { useState, useRef, useEffect } from 'react';
import { useAuth } from '../contexts/AuthContext';

function AdminScopeToggle() {
    const { isAdmin, user, adminScope, setAdminScopeTeams, KNOWN_TEAMS, hasTeams } = useAuth();
    const [open, setOpen] = useState(false);
    const ref = useRef(null);

    // Close dropdown on outside click
    useEffect(() => {
        if (!open) return;
        const handler = (e) => {
            if (ref.current && !ref.current.contains(e.target)) setOpen(false);
        };
        document.addEventListener('mousedown', handler);
        return () => document.removeEventListener('mousedown', handler);
    }, [open]);

    // Only render for Admin users
    if (!isAdmin()) return null;

    const selectedTeams = adminScope || [];
    const myTeams = user?.teams || [];
    const allSelected = selectedTeams.length === KNOWN_TEAMS.length;
    const isMyTeams = myTeams.length > 0 &&
        selectedTeams.length === myTeams.length &&
        myTeams.every(t => selectedTeams.includes(t));

    const toggleTeam = (team) => {
        const next = selectedTeams.includes(team)
            ? selectedTeams.filter(t => t !== team)
            : [...selectedTeams, team];
        setAdminScopeTeams(next);
    };

    const selectAll = () => setAdminScopeTeams([...KNOWN_TEAMS]);
    const selectMyTeams = () => setAdminScopeTeams([...myTeams]);

    // Label for the button
    let label;
    if (allSelected || selectedTeams.length === 0) {
        label = 'All BUs';
    } else if (isMyTeams) {
        label = 'My Teams';
    } else {
        label = selectedTeams.join(', ');
    }

    return (
        <div ref={ref} style={{ position: 'relative', display: 'inline-block' }}>
            <button
                onClick={() => setOpen(!open)}
                aria-label="Select BU scope"
                aria-expanded={open}
                style={{
                    display: 'inline-flex',
                    alignItems: 'center',
                    gap: '0.35rem',
                    padding: '0.3rem 0.6rem',
                    borderRadius: '0.375rem',
                    background: 'rgba(14, 165, 233, 0.05)',
                    border: '1px solid rgba(14, 165, 233, 0.2)',
                    fontSize: '0.68rem',
                    fontFamily: 'monospace',
                    fontWeight: '600',
                    color: '#0EA5E9',
                    cursor: 'pointer',
                    userSelect: 'none',
                    transition: 'all 0.15s',
                    maxWidth: '200px',
                    overflow: 'hidden',
                    textOverflow: 'ellipsis',
                    whiteSpace: 'nowrap',
                }}
            >
                <span style={{ color: '#64748B', fontWeight: '500' }}>Scope:</span>
                <span>{label}</span>
                <span style={{ fontSize: '0.6rem', color: '#475569' }}>▾</span>
            </button>

            {open && (
                <div style={{
                    position: 'absolute',
                    top: 'calc(100% + 4px)',
                    right: 0,
                    zIndex: 100,
                    minWidth: '180px',
                    background: 'linear-gradient(135deg, #1E293B 0%, #0F172A 100%)',
                    border: '1px solid rgba(14, 165, 233, 0.3)',
                    borderRadius: '0.5rem',
                    boxShadow: '0 8px 24px rgba(0,0,0,0.6)',
                    padding: '0.5rem 0',
                }}>
                    {/* Presets */}
                    <div style={{ padding: '0.25rem 0.75rem 0.5rem', borderBottom: '1px solid rgba(255,255,255,0.06)' }}>
                        <button
                            onClick={selectAll}
                            style={{
                                display: 'block', width: '100%', textAlign: 'left',
                                background: allSelected ? 'rgba(139,92,246,0.12)' : 'none',
                                border: 'none', padding: '0.3rem 0.4rem', borderRadius: '0.25rem',
                                color: allSelected ? '#A78BFA' : '#94A3B8',
                                fontSize: '0.7rem', fontFamily: 'monospace', fontWeight: '600',
                                cursor: 'pointer', marginBottom: '0.2rem',
                            }}
                        >
                            ⊕ All BUs
                        </button>
                        {myTeams.length > 0 && (
                            <button
                                onClick={selectMyTeams}
                                style={{
                                    display: 'block', width: '100%', textAlign: 'left',
                                    background: isMyTeams ? 'rgba(14,165,233,0.12)' : 'none',
                                    border: 'none', padding: '0.3rem 0.4rem', borderRadius: '0.25rem',
                                    color: isMyTeams ? '#0EA5E9' : '#94A3B8',
                                    fontSize: '0.7rem', fontFamily: 'monospace', fontWeight: '600',
                                    cursor: 'pointer',
                                }}
                            >
                                ⊙ My Teams ({myTeams.join(', ')})
                            </button>
                        )}
                    </div>

                    {/* Individual team checkboxes */}
                    <div style={{ padding: '0.5rem 0.75rem' }}>
                        {KNOWN_TEAMS.map(team => {
                            const checked = selectedTeams.includes(team);
                            return (
                                <label
                                    key={team}
                                    style={{
                                        display: 'flex', alignItems: 'center', gap: '0.4rem',
                                        padding: '0.3rem 0.25rem', cursor: 'pointer',
                                        borderRadius: '0.2rem',
                                        fontSize: '0.72rem', fontFamily: 'monospace',
                                        color: checked ? '#E2E8F0' : '#64748B',
                                        fontWeight: checked ? '600' : '400',
                                    }}
                                >
                                    <input
                                        type="checkbox"
                                        checked={checked}
                                        onChange={() => toggleTeam(team)}
                                        style={{ accentColor: '#0EA5E9', cursor: 'pointer' }}
                                    />
                                    {team}
                                </label>
                            );
                        })}
                    </div>
                </div>
            )}
        </div>
    );
}

export default AdminScopeToggle;