<template>
  <div class="log-view">
    <div class="log-header">
      <div class="title-row">
        <Icon icon="lucide:terminal" class="title-icon" />
        <h1 class="title">运行日志</h1>
        <span class="log-count">共 {{ logStore.logs.length }} 条</span>
      </div>

      <div class="stats-row">
        <span class="stat info">info {{ counts.info }}</span>
        <span class="stat warn">warn {{ counts.warn }}</span>
        <span class="stat error">error {{ counts.error }}</span>
        <span class="stat debug">debug {{ counts.debug }}</span>
      </div>

      <div class="toolbar">
        <div class="filter-group">
          <label class="filter-label">模块</label>
          <select v-model="selectedModule" class="filter-select">
            <option value="">全部</option>
            <option v-for="m in modules" :key="m" :value="m">{{ m }}</option>
          </select>

          <label class="filter-label">级别</label>
          <select v-model="selectedLevel" class="filter-select">
            <option value="">全部</option>
            <option value="debug">debug</option>
            <option value="info">info</option>
            <option value="warn">warn</option>
            <option value="error">error</option>
          </select>

          <label class="filter-label">搜索</label>
          <input v-model="searchText" class="filter-input" placeholder="关键字..." />
        </div>

        <div class="action-group">
          <button class="btn" @click="scrollToBottom()" title="滚到底部">
            <Icon icon="lucide:arrow-down-to-line" />
          </button>
          <button class="btn" @click="exportLogs()" title="导出">
            <Icon icon="lucide:download" />
          </button>
          <button class="btn danger" @click="onClear()" title="清空">
            <Icon icon="lucide:trash-2" />
          </button>
        </div>
      </div>
    </div>

    <div ref="listRef" class="log-body">
      <div v-if="filtered.length === 0" class="empty-state">
        <Icon icon="lucide:file-text" class="empty-icon" />
        <div class="empty-text">暂无日志</div>
      </div>

      <div
        v-for="entry in filtered"
        :key="entry.id"
        class="log-row"
        :class="entry.level"
        @click="toggleExpand(entry.id)"
      >
        <div class="row-main">
          <span class="log-time">{{ entry.time }}</span>
          <span class="log-level">{{ entry.level.toUpperCase() }}</span>
          <span class="log-module">[{{ entry.module }}]</span>
          <span class="log-message">{{ entry.message }}</span>
          <Icon v-if="entry.detail !== undefined" icon="lucide:chevron-down" class="expand-icon" :class="{ expanded: expandedIds.has(entry.id) }" />
        </div>
        <div v-if="entry.detail !== undefined && expandedIds.has(entry.id)" class="row-detail">
          <pre>{{ formatDetail(entry.detail) }}</pre>
        </div>
      </div>
    </div>
  </div>
</template>

<script setup lang="ts">
import { computed, ref, onMounted, nextTick } from 'vue';
import { Icon } from '@iconify/vue';
import { useLogStore } from '../stores/log';

const logStore = useLogStore();

const selectedModule = ref('');
const selectedLevel = ref('');
const searchText = ref('');
const listRef = ref<HTMLDivElement | null>(null);
const expandedIds = ref<Set<number>>(new Set());

const modules = computed(() => logStore.moduleList());
const counts = computed(() => logStore.countByLevel());

const filtered = computed(() => {
    const keyword = searchText.value.trim().toLowerCase();
    return logStore.logs.filter((l) => {
        if (selectedModule.value && l.module !== selectedModule.value) return false;
        if (selectedLevel.value && l.level !== selectedLevel.value) return false;
        if (keyword) {
            const hay = `${l.message} ${l.module}`.toLowerCase();
            if (!hay.includes(keyword)) return false;
        }
        return true;
    });
});

const toggleExpand = (id: number) => {
    if (expandedIds.value.has(id)) {
        expandedIds.value.delete(id);
    } else {
        expandedIds.value.add(id);
    }
};

const formatDetail = (d: any) => {
    if (d instanceof Error) {
        return `${d.name}: ${d.message}\n${d.stack || ''}`;
    }
    if (typeof d === 'string') return d;
    try {
        return JSON.stringify(d, null, 2);
    } catch {
        return String(d);
    }
};

const scrollToBottom = () => {
    if (listRef.value) {
        nextTick(() => {
            listRef.value!.scrollTop = listRef.value!.scrollHeight;
        });
    }
};

const exportLogs = () => {
    const lines = logStore.logs.map((l) => {
        const detail = l.detail !== undefined ? ' | ' + formatDetail(l.detail).replace(/\n/g, '  ') : '';
        return `[${l.time}] [${l.level.toUpperCase()}] [${l.module}] ${l.message}${detail}`;
    });
    const blob = new Blob([lines.join('\n')], { type: 'text/plain;charset=utf-8' });
    const url = URL.createObjectURL(blob);
    const a = document.createElement('a');
    a.href = url;
    a.download = `qzmusic-logs-${new Date().toISOString().replace(/[:.]/g, '-')}.txt`;
    a.click();
    URL.revokeObjectURL(url);
};

const onClear = () => {
    if (confirm('确定清空所有日志？')) {
        logStore.clear();
    }
};

onMounted(() => {
    scrollToBottom();
});
</script>

<style scoped>
.log-view {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    gap: 16px;
    padding: 24px;
}

.log-header {
    background: var(--color-bg-secondary);
    border-radius: 12px;
    padding: 16px 20px;
    border: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.title-row {
    display: flex;
    align-items: center;
    gap: 12px;
}

.title-icon {
    font-size: 22px;
    color: var(--color-accent);
}

.title {
    font-size: 20px;
    font-weight: 600;
    color: var(--color-text-primary);
    margin: 0;
}

.log-count {
    font-size: 12px;
    color: var(--color-text-muted);
    margin-left: 8px;
}

.stats-row {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.stat {
    font-size: 12px;
    padding: 4px 10px;
    border-radius: 6px;
    font-family: ui-monospace, monospace;
    font-weight: 500;
}

.stat.info { background: rgba(59, 130, 246, 0.12); color: #3b82f6; }
.stat.warn { background: rgba(245, 158, 11, 0.15); color: #f59e0b; }
.stat.error { background: rgba(239, 68, 68, 0.12); color: #ef4444; }
.stat.debug { background: rgba(139, 92, 246, 0.12); color: #8b5cf6; }

.toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
    border-top: 1px solid var(--color-border);
    padding-top: 12px;
}

.filter-group {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.filter-label {
    font-size: 12px;
    color: var(--color-text-muted);
}

.filter-select,
.filter-input {
    background: var(--color-bg-primary);
    border: 1px solid var(--color-border);
    color: var(--color-text-primary);
    padding: 6px 10px;
    border-radius: 6px;
    font-size: 12px;
    outline: none;
    transition: border-color 0.15s;
}

.filter-select:focus,
.filter-input:focus {
    border-color: var(--color-accent);
}

.filter-input {
    width: 160px;
}

.action-group {
    display: flex;
    gap: 6px;
}

.btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 8px 12px;
    background: var(--color-bg-primary);
    border: 1px solid var(--color-border);
    color: var(--color-text-secondary);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.15s;
    font-size: 13px;
}

.btn:hover {
    color: var(--color-text-primary);
    background: var(--color-bg-tertiary);
    border-color: var(--color-text-muted);
}

.btn.danger:hover {
    color: #ef4444;
    border-color: #ef4444;
    background: rgba(239, 68, 68, 0.08);
}

.log-body {
    flex: 1;
    overflow-y: auto;
    background: var(--color-bg-secondary);
    border-radius: 12px;
    border: 1px solid var(--color-border);
    padding: 8px 0;
    font-family: ui-monospace, 'SF Mono', Menlo, Consolas, monospace;
    font-size: 12.5px;
}

.log-body::-webkit-scrollbar {
    width: 8px;
}

.log-body::-webkit-scrollbar-track {
    background: transparent;
}

.log-body::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 4px;
}

.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 60px 20px;
    color: var(--color-text-muted);
    gap: 12px;
}

.empty-icon {
    font-size: 48px;
    opacity: 0.3;
}

.empty-text {
    font-size: 14px;
}

.log-row {
    display: flex;
    flex-direction: column;
    padding: 8px 16px;
    cursor: pointer;
    border-bottom: 1px solid transparent;
    transition: background 0.1s;
}

.log-row:hover {
    background: var(--color-bg-tertiary);
}

.row-main {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.log-time {
    color: var(--color-text-muted);
    flex-shrink: 0;
}

.log-level {
    font-weight: 700;
    flex-shrink: 0;
    min-width: 48px;
}

.log-module {
    color: var(--color-text-muted);
    flex-shrink: 0;
}

.log-message {
    color: var(--color-text-primary);
    flex: 1;
    white-space: pre-wrap;
    word-break: break-word;
}

.expand-icon {
    color: var(--color-text-muted);
    font-size: 14px;
    transition: transform 0.15s;
    flex-shrink: 0;
}

.expand-icon.expanded {
    transform: rotate(180deg);
}

.log-row.info .log-level { color: #3b82f6; }
.log-row.warn .log-level { color: #f59e0b; }
.log-row.error .log-level { color: #ef4444; }
.log-row.error { background: rgba(239, 68, 68, 0.04); }
.log-row.error:hover { background: rgba(239, 68, 68, 0.08); }
.log-row.debug .log-level { color: #8b5cf6; }

.row-detail {
    margin-top: 8px;
    padding: 10px 12px;
    background: var(--color-bg-primary);
    border-left: 3px solid var(--color-accent);
    border-radius: 0 6px 6px 0;
    overflow-x: auto;
    cursor: text;
}

.row-detail pre {
    margin: 0;
    font-family: inherit;
    font-size: 12px;
    color: var(--color-text-secondary);
    white-space: pre-wrap;
    word-break: break-word;
    line-height: 1.6;
}
</style>
