/**
 * WPDO Post Stress Test — admin tab JS (v2.11.4)
 *
 * Mirrors wpdo-stress-test.js (user side) but:
 *   - Talks to /wpdo/v1/post-stress-test/* endpoints
 *   - Sends post_type in start payload (user side has no entity selector)
 *   - DOM IDs prefixed wpdo-pst-* to coexist on the same admin page
 *   - Renders a smaller benchmark report (3 probes per post_type vs 6 for user)
 *
 * @since 2.11.4
 */
( function () {
	'use strict';

	const cfg = window.wpdoPostStressTest;
	if ( ! cfg || ! cfg.restUrl ) {
		return;
	}
	if ( ! document.querySelector( '.wpdo-post-stress-test-tab' ) ) {
		return;
	}

	const $ = ( sel ) => document.querySelector( sel );
	const restUrl = cfg.restUrl.replace( /\/$/, '' );
	const headers = { 'Content-Type': 'application/json', 'X-WP-Nonce': cfg.nonce };

	let pollTimer = null;

	// ── API helpers ─────────────────────────────────────────────────────────

	async function apiCall( path, method = 'GET', body = null ) {
		const opts = { method, headers, credentials: 'same-origin' };
		if ( body ) {
			opts.body = JSON.stringify( body );
		}
		const resp = await fetch( restUrl + path, opts );
		const text = await resp.text();
		try {
			return { ok: resp.ok, status: resp.status, data: text ? JSON.parse( text ) : null };
		} catch ( e ) {
			return { ok: false, status: resp.status, data: { error: text } };
		}
	}

	// ── Rendering ───────────────────────────────────────────────────────────

	function fmt( n ) {
		if ( n === null || n === undefined ) {
			return '—';
		}
		return Number( n ).toLocaleString();
	}

	function setText( sel, text ) {
		const el = $( sel );
		if ( el ) {
			el.textContent = String( text );
		}
	}

	function esc( s ) {
		if ( s === null || s === undefined ) {
			return '';
		}
		return String( s ).replace( /[&<>"']/g, ( c ) => ( {
			'&': '&amp;',
			'<': '&lt;',
			'>': '&gt;',
			'"': '&quot;',
			"'": '&#39;',
		}[ c ] ) );
	}

	function renderProgress( state ) {
		const isRunning = state.status === 'running' || state.status === 'benchmarking';
		const card = $( '#wpdo-pst-progress-card' );
		if ( card ) {
			card.style.display = ( isRunning || state.status === 'completed' || state.status === 'failed' || state.status === 'cancelled' ) ? '' : 'none';
		}
		setText( '#wpdo-pst-pg-status', state.status || 'idle' );
		setText( '#wpdo-pst-pg-post-type', state.post_type || '' );
		setText( '#wpdo-pst-pg-mode', state.mode || '' );
		setText( '#wpdo-pst-pg-pct', ( state.pct || 0 ) + '%' );
		setText( '#wpdo-pst-pg-processed', fmt( state.processed || 0 ) );
		setText( '#wpdo-pst-pg-target', fmt( state.target || 0 ) );
		setText( '#wpdo-pst-pg-rate', state.rate_per_sec || 0 );
		setText( '#wpdo-pst-pg-elapsed', state.elapsed_sec || 0 );
		setText( '#wpdo-pst-pg-eta', state.eta_sec || 0 );
		setText( '#wpdo-pst-pg-batches', state.batches_done || 0 );
		setText( '#wpdo-pst-pg-mem', ( ( state.peak_memory || 0 ) / 1048576 ).toFixed( 1 ) );

		const bar = $( '#wpdo-pst-pg-bar' );
		if ( bar ) {
			bar.style.width = ( state.pct || 0 ) + '%';
		}

		const count = state.test_post_count || 0;
		setText( '#wpdo-pst-count', fmt( count ) );
		setText( '#wpdo-pst-count-mirror', fmt( count ) );

		const startBtn   = $( '#wpdo-pst-start' );
		const cancelBtn  = $( '#wpdo-pst-cancel' );
		const cleanupBtn = $( '#wpdo-pst-cleanup' );
		const benchBtn   = $( '#wpdo-pst-rerun-bench' );
		if ( startBtn ) {
			startBtn.disabled = isRunning;
		}
		if ( cancelBtn ) {
			cancelBtn.disabled = ! isRunning;
		}
		if ( cleanupBtn ) {
			cleanupBtn.disabled = isRunning || count === 0;
		}
		if ( benchBtn ) {
			benchBtn.disabled = isRunning || count === 0;
		}
	}

	function renderBenchmark( bench ) {
		if ( ! bench ) {
			return;
		}
		const card    = $( '#wpdo-pst-bench-card' );
		const content = $( '#wpdo-pst-bench-content' );
		if ( ! card || ! content ) {
			return;
		}
		card.style.display = '';

		const w       = bench.write || {};
		const dbSizes = bench.db_sizes || [];
		const q       = bench.query || {};

		// Friendly labels for the per-post_type query probes
		const labels = {
			point_stock_status:  'Point lookup (_stock_status)',
			point_status:        'Point lookup (hp_status)',
			point_verified:      'Point lookup (hp_verified)',
			point_alt_present:   'Point lookup (alt 文字)',
			point_type:          'Point lookup (_menu_item_type)',
			point_thumbnail:     'Point lookup (_thumbnail_id)',
			range_price_above:   'Range scan (price > 100)',
			range_budget_above:  'Range scan (budget > 100)',
			range_rate_above:    'Range scan (hourly_rate > 50)',
			range_id_above:      'Range scan (post_id 排序)',
			eav_baseline:        'EAV baseline (wp_postmeta 直查)',
		};

		let html = '';
		// Write metrics
		html += '<h4 style="margin-bottom:6px;">▍ 寫入指標</h4>';
		html += '<table class="widefat" style="margin-bottom:14px;"><tbody>';
		html += `<tr><td>模式</td><td><code>${ esc( w.mode ) }</code></td></tr>`;
		html += `<tr><td>Post Type</td><td><code>${ esc( w.post_type ) }</code></td></tr>`;
		html += `<tr><td>完成 / 目標</td><td>${ fmt( w.processed ) } / ${ fmt( w.target ) }</td></tr>`;
		html += `<tr><td>總耗時</td><td>${ fmt( w.elapsed_sec ) } 秒</td></tr>`;
		html += `<tr><td>平均速率</td><td><strong>${ fmt( w.rate_per_sec ) }</strong> posts/sec</td></tr>`;
		html += `<tr><td>批次數</td><td>${ fmt( w.batches_done ) }</td></tr>`;
		html += `<tr><td>批次最快/平均/最慢</td><td>${ fmt( w.batch_min_ms ) } / ${ fmt( w.batch_avg_ms ) } / ${ fmt( w.batch_max_ms ) } ms</td></tr>`;
		html += `<tr><td>PHP Peak Memory</td><td>${ fmt( w.peak_memory_mb ) } MB</td></tr>`;
		html += '</tbody></table>';

		// DB sizes (wp_posts + wp_postmeta + flat table for this run)
		html += '<h4 style="margin-bottom:6px;">▍ DB 容量（post 相關表）</h4>';
		html += '<table class="widefat striped" style="margin-bottom:14px;"><thead><tr>';
		html += '<th>Table</th><th>Rows</th><th>Data MB</th><th>Index MB</th><th>Total MB</th><th>Avg bytes/row</th>';
		html += '</tr></thead><tbody>';
		dbSizes.forEach( ( r ) => {
			html += `<tr><td><code>${ esc( r.table ) }</code></td><td>${ fmt( r.rows ) }</td>`;
			html += `<td>${ r.data_mb ?? '—' }</td><td>${ r.index_mb ?? '—' }</td>`;
			html += `<td><strong>${ r.total_mb ?? '—' }</strong></td><td>${ fmt( r.avg_bytes ) }</td></tr>`;
		} );
		html += '</tbody></table>';

		// Query perf — 3 probes per post_type, with EAV baseline last for visual comparison
		html += '<h4 style="margin-bottom:6px;">▍ 查詢效能</h4>';
		html += '<table class="widefat striped" style="margin-bottom:8px;"><thead><tr>';
		html += '<th>測試項目</th><th>耗時 (ms)</th>';
		html += '</tr></thead><tbody>';

		const baselineMs = q.eav_baseline?.duration_ms ?? null;
		Object.keys( q ).forEach( ( key ) => {
			const v = q[ key ];
			if ( ! v || typeof v.duration_ms !== 'number' ) {
				return;
			}
			const label = labels[ key ] || key;
			let speedup = '';
			if ( baselineMs !== null && key !== 'eav_baseline' && v.duration_ms > 0 ) {
				const ratio = baselineMs / v.duration_ms;
				if ( ratio >= 1 ) {
					speedup = ` <span style="color:#28a745;font-weight:600;">(${ ratio.toFixed( 2 ) }× faster)</span>`;
				}
			}
			html += `<tr><td>${ esc( label ) }${ speedup }</td><td><strong>${ v.duration_ms }</strong></td></tr>`;
		} );
		html += '</tbody></table>';
		html += '<p class="description">EAV baseline 走 wp_postmeta，flat probes 走專屬 group 表。倍率即此規模下反 EAV 的查詢加速。</p>';

		content.innerHTML = html;
	}

	// ── Polling ─────────────────────────────────────────────────────────────

	async function poll() {
		const r = await apiCall( '/post-stress-test/status' );
		if ( ! r.ok || ! r.data ) {
			return;
		}
		renderProgress( r.data );
		if ( r.data.benchmark ) {
			renderBenchmark( r.data.benchmark );
		}
		if ( r.data.status !== 'running' && r.data.status !== 'benchmarking' ) {
			stopPolling();
		}
	}

	function startPolling() {
		stopPolling();
		poll();
		pollTimer = setInterval( poll, 2000 );
	}

	function stopPolling() {
		if ( pollTimer ) {
			clearInterval( pollTimer );
			pollTimer = null;
		}
	}

	// ── Event handlers ──────────────────────────────────────────────────────

	async function handleStart() {
		const postType = $( '#wpdo-pst-post-type' ).value;
		const target   = parseInt( $( '#wpdo-pst-target' ).value, 10 );
		const batch    = parseInt( $( '#wpdo-pst-batch' ).value, 10 );
		const mode     = document.querySelector( 'input[name="wpdo-pst-mode"]:checked' ).value;

		if ( ! postType ) {
			alert( '請選擇 post_type' );
			return;
		}
		if ( ! target || target < 1 ) {
			alert( '請輸入有效的 post 數量' );
			return;
		}
		// Realistic 模式每 post 100-300ms，batch 太大會撞 nginx 60s timeout 之前的 8s deadline
		if ( mode === 'realistic' && batch > 30 ) {
			if ( ! confirm( `Realistic 模式每個 post 約需 100-300 ms，batch_size=${ batch } 可能超過後端 8s deadline 上限。建議使用 batch=10-20。要繼續嗎？` ) ) {
				return;
			}
		}

		// Soft warn for combinations that won't demonstrate反 EAV 優化效果
		const postMode = String( cfg.postMode || 'disabled' );
		if ( mode === 'fast' && postMode === 'aeav_only' ) {
			if ( ! confirm( `⚠️ Fast 模式直接 $wpdb->insert 繞過 Hook Bus，即使 post mode=aeav_only 也會寫滿 wp_postmeta（fixture 用途，非優化驗證）。\n\n如果你想驗證反 EAV 優化效果（wp_postmeta 應為 0），請改用 🐢 Realistic 模式。\n\n仍以 Fast 模式繼續嗎？` ) ) {
				return;
			}
		} else if ( mode === 'realistic' && postMode !== 'aeav_only' ) {
			if ( ! confirm( `⚠️ 目前 post mode = ${ postMode }，此模式下 Realistic 寫入仍會雙寫 wp_postmeta（不會展示優化效果，ratio 不變）。\n\n要看 wp_postmeta 完全短路（0 寫入）需要先把 mode 升到 aeav_only（設定 tab）。\n\n仍以 ${ postMode } 模式繼續測試嗎？` ) ) {
				return;
			}
		}

		const big = target >= 5000;
		const msg = `即將以 ${ mode } 模式建立 ${ target.toLocaleString() } 筆 ${ postType } 測試 post${ big ? '（規模較大，可能耗時數分鐘）' : '' }。\n\n所有 post 的 post_title 會以 WPDO_STRESS_TEST_ 開頭，可一鍵清除。\n\n確定要開始嗎？`;
		if ( ! confirm( msg ) ) {
			return;
		}

		const r = await apiCall( '/post-stress-test/start', 'POST', {
			post_type: postType,
			target,
			mode,
			batch_size: batch,
		} );
		if ( ! r.ok ) {
			alert( '啟動失敗：' + ( r.data?.error || r.status ) );
			return;
		}
		// 啟動後立即顯示進度卡片
		const card = $( '#wpdo-pst-progress-card' );
		if ( card ) {
			card.style.display = '';
		}
		// Hide the previous benchmark card (a fresh run will replace it)
		const benchCard = $( '#wpdo-pst-bench-card' );
		if ( benchCard ) {
			benchCard.style.display = 'none';
		}
		setText( '#wpdo-pst-pg-status', 'running' );
		setText( '#wpdo-pst-pg-post-type', postType );
		setText( '#wpdo-pst-pg-mode', mode );
		setText( '#wpdo-pst-pg-target', target.toLocaleString() );
		startPolling();
	}

	async function handleCancel() {
		if ( ! confirm( '確定要取消當前測試？已建立的 post 不會被刪除。' ) ) {
			return;
		}
		const cancelBtn = $( '#wpdo-pst-cancel' );
		if ( cancelBtn ) {
			cancelBtn.disabled    = true;
			cancelBtn.textContent = '⏹ 取消中…';
		}
		setText( '#wpdo-pst-pg-status', 'cancelling' );

		const r = await apiCall( '/post-stress-test/cancel', 'POST' );
		if ( ! r.ok ) {
			alert( '取消失敗：' + ( r.data?.error || r.status ) );
			if ( cancelBtn ) {
				cancelBtn.disabled    = false;
				cancelBtn.textContent = '⏹ 取消';
			}
			return;
		}
		// realistic 模式 in-flight batch 可能還要 ~1 秒才會真正中止
		poll();
		if ( cancelBtn ) {
			cancelBtn.textContent = '⏹ 取消';
		}
	}

	async function handleCleanup() {
		if ( ! confirm( '確定要清除所有 stress test posts？\n\n此動作會：\n- DELETE 所有 post_title 前綴 WPDO_STRESS_TEST_ 的 post\n- DELETE 對應 wp_postmeta\n- DELETE 7 張 wp_wpdo_post_* flat tables 中對應 post_id 的列\n\n不可復原！' ) ) {
			return;
		}
		const r = await apiCall( '/post-stress-test/cleanup', 'DELETE' );
		if ( ! r.ok ) {
			alert( '清除失敗：' + ( r.data?.error || r.status ) );
			return;
		}
		alert( `已清除 ${ r.data.deleted } 筆測試 post。` );
		const card      = $( '#wpdo-pst-progress-card' );
		const benchCard = $( '#wpdo-pst-bench-card' );
		if ( card ) card.style.display = 'none';
		if ( benchCard ) benchCard.style.display = 'none';
		poll();
	}

	async function handleRerunBench() {
		const btn = $( '#wpdo-pst-rerun-bench' );
		if ( btn ) {
			btn.disabled    = true;
			btn.textContent = '⏳ 執行中...';
		}
		const r = await apiCall( '/post-stress-test/benchmark', 'POST' );
		if ( btn ) {
			btn.disabled    = false;
			btn.textContent = '📊 重跑 Benchmark（不新增資料）';
		}
		if ( ! r.ok ) {
			alert( 'Benchmark 失敗：' + ( r.data?.error || r.status ) );
			return;
		}
		renderBenchmark( r.data.benchmark );
	}

	// ── Init ────────────────────────────────────────────────────────────────

	document.addEventListener( 'DOMContentLoaded', () => {
		const startBtn   = $( '#wpdo-pst-start' );
		const cancelBtn  = $( '#wpdo-pst-cancel' );
		const cleanupBtn = $( '#wpdo-pst-cleanup' );
		const benchBtn   = $( '#wpdo-pst-rerun-bench' );

		if ( startBtn ) startBtn.addEventListener( 'click', handleStart );
		if ( cancelBtn ) cancelBtn.addEventListener( 'click', handleCancel );
		if ( cleanupBtn ) cleanupBtn.addEventListener( 'click', handleCleanup );
		if ( benchBtn ) benchBtn.addEventListener( 'click', handleRerunBench );

		// 初始 poll：若 status==running 自動接手 polling；若 completed 渲染 benchmark
		poll().then( () => {
			const status = ( $( '#wpdo-pst-pg-status' )?.textContent || '' ).trim();
			if ( status === 'running' || status === 'benchmarking' ) {
				startPolling();
			}
		} );
	} );
} )();