import json
from collections import defaultdict
from datetime import datetime
from flask import session
import config_utils
import factory


def collect_tokens(cfg):
    tokens = config_utils.collect_layout_tokens(cfg)
    tokens['GENERAL_APPLY_ON_SAVE'] = 'true' if session.get('apply_changes_immediately', False) else 'false'

    all_groups = config_utils.load_all_groups()
    group_uuid_set = {g['uuid'] for g, _ in all_groups}
    pending_items = config_utils.get_dashboard_pending()

    if pending_items:
        pgroups = defaultdict(list)
        for uuid, ts, cmd, user in pending_items:
            pgroups[cmd].append((uuid, user))
        rows = ''
        for cmd, entries in pgroups.items():
            users = ', '.join(sorted({u for _, u in entries if u and u != 'unknown'}))
            snap_uuids = [uuid for uuid, _ in entries if uuid in group_uuid_set]
            if snap_uuids:
                req_tags = ''.join(
                    f'<span class="tag" data-tooltip="{uuid}" data-uuid="{uuid}">'
                    f'<span class="tl-full">{uuid[:8]}</span>'
                    f'<span class="tl-short">{uuid[:8]}</span>'
                    f'<span class="tl-min">{uuid[:8]}</span>'
                    '</span>'
                    for uuid in snap_uuids
                )
                req_cell = f'<td class="table-cell"><div class="tag-list">{req_tags}</div></td>'
            else:
                req_cell = '<td class="table-cell">-</td>'
            rows += (
                '<tr>'
                f'<td class="table-cell">{factory.e(cmd)}</td>'
                f'<td class="table-cell">{factory.e(users)}</td>'
                f'{req_cell}'
                '</tr>'
            )
        pending_html = (
            '<table class="data-table"><thead><tr>'
            '<th class="table-header">Command</th>'
            '<th class="table-header">User</th>'
            '<th class="table-header">Required By</th>'
            '</tr></thead>'
            f'<tbody>{rows}</tbody></table>'
        )
    else:
        pending_html = '<p class="text-muted">No pending actions.</p>'

    tokens['PENDING_ACTIONS_HTML'] = pending_html
    tokens['NO_PENDING'] = 'true' if not pending_items else ''
    tokens['NO_DISMISSIBLE_PENDING'] = 'true' if not any(c != 'fix problems' for _, _, c, _ in pending_items) else ''
    tokens['APPLY_WARNING'] = (
        f'<span style="color:var(--warning)"><p>{factory.load_icon("arrow-left")} <strong>Applying actions will briefly disrupt connections as network services are restarted.</strong></p></span>'
        if pending_items else ''
    )

    done_ts_map = config_utils.get_done_timestamps()
    if all_groups:
        is_manager = factory.client_level() >= factory.LEVEL_RANK['manager']
        no_revert = {g['uuid'] for g, _ in all_groups if g['reverted'] or g['reverts_group']}
        hist_rows = ''
        hist_onclick = (
            'onclick="if(event.target.type!==\'checkbox\')'
            'this.nextElementSibling.hidden=!this.nextElementSibling.hidden"'
        )
        for g, changes in all_groups:
            uuid = g['uuid']
            applied_ts = done_ts_map.get(uuid)
            dt_str = datetime.fromtimestamp(applied_ts).strftime('%Y-%m-%d %H:%M') if applied_ts else '-'
            all_before_null = all(c['before'] is None for c in changes)
            all_after_null  = all(c['after']  is None for c in changes)
            if g['reverts_group']:
                verb = 'Reverted'
            elif all_before_null:
                verb = 'Added'
            elif all_after_null:
                verb = 'Deleted'
            else:
                verb = 'Edited'
            item    = g.get('item_value') or ''
            summary_text = f'{verb} {g["parent_path"]}: {item}' if item else f'{verb} {g["parent_path"]}'
            if g['reverted']:
                summary = f'<span style="text-decoration:line-through;opacity:0.5">{factory.e(summary_text)}</span> <span class="badge badge-disabled">Superseded</span>'
            else:
                summary = factory.e(summary_text)
            snap_tag = (
                f'<div class="tag-list"><span class="tag" data-tooltip="{factory.e(uuid)}" data-uuid="{factory.e(uuid)}">'
                f'<span class="tl-full">{factory.e(uuid[:8])}</span>'
                f'<span class="tl-short">{factory.e(uuid[:8])}</span>'
                f'<span class="tl-min">{factory.e(uuid[:8])}</span>'
                '</span></div>'
            )
            snap_user = factory.e(g.get('user', ''))
            cb_attrs = '' if is_manager else ('disabled title="Cannot revert"' if uuid in no_revert else '')
            hist_rows += (
                f'<tr class="row-expandable" data-uuid="{factory.e(uuid)}" {hist_onclick}>'
                f'<td class="table-cell"><input type="checkbox" name="selected_uuids" value="{factory.e(uuid)}" {cb_attrs}/></td>'
                f'<td class="table-cell">{factory.e(dt_str)}</td>'
                f'<td class="table-cell">{summary}</td>'
                f'<td class="table-cell">{factory.build_snap_val(changes)}</td>'
                f'<td class="table-cell">{snap_tag}</td>'
                f'<td class="table-cell">{snap_user}</td>'
                '</tr>'
                f'{factory.snap_expand_row(changes, 6)}'
            )
        select_all = (
            '<input type="checkbox" '
            'onchange="document.querySelectorAll(\'[name=selected_uuids]:not(:disabled)\').forEach(c=>c.checked=this.checked)"/>'
        )
        history_html = (
            '<table class="data-table"><thead><tr>'
            f'<th class="table-header">{select_all}</th>'
            '<th class="table-header">Applied</th>'
            '<th class="table-header">Change</th>'
            '<th class="table-header">Fields</th>'
            '<th class="table-header">Change ID</th>'
            '<th class="table-header">User</th>'
            '</tr></thead>'
            f'<tbody>{hist_rows}</tbody></table>'
        )
    else:
        history_html = '<p class="text-muted">No change history.</p>'

    tokens['CHANGE_HISTORY_HTML'] = history_html
    tokens['NO_HISTORY'] = 'true' if not all_groups else ''
    return tokens