/**
 * TokenUsage — Token 统计面板
 *
 * 始终展示完整结构，无会话时显示零值。
 * 固定在详情面板中部，高度由内容自然决定。
 */

import { Box, Typography, Stack, Table, TableBody, TableRow, TableCell } from '@mui/material';
import { Zap } from 'lucide-react';
import { useAgentStore } from '@renderer/stores/agent-store';
import { formatTokens } from '@renderer/lib/formatters';
// v0.7.4 P3-1: 文案出层（字典含注册副作用，须在 t() 使用前 import）
import { t } from '@renderer/lib/i18n';
import '@renderer/lib/i18n-strings';

export function TokenUsage(): React.JSX.Element {
  const tokenUsage = useAgentStore((s) => s.tokenUsage);
  const maxIterations = useAgentStore((s) => s.maxIterations);
  const currentIteration = useAgentStore((s) => s.currentIteration);
  const contextWindow = useAgentStore((s) => s.contextWindow);

  const maxTokens = contextWindow;
  // v0.3.18 修复: 上下文占用百分比改用 lastInputTokens（单次占用），而非累计 totalTokens
  // 之前 totalTokens 是所有轮次累加值，除以单次窗口得出无意义的百分比
  const contextPercent =
    maxTokens > 0 && tokenUsage.lastInputTokens > 0
      ? Math.min((tokenUsage.lastInputTokens / maxTokens) * 100, 100)
      : 0;
  // 累计消耗的输入/输出占比（用于进度条展示累计消耗的构成）
  const inputPercent =
    tokenUsage.totalTokens > 0 ? (tokenUsage.inputTokens / tokenUsage.totalTokens) * 100 : 0;

  return (
    <Box sx={{ mt: 2, pt: 2, borderTop: 1, borderColor: 'divider', flexShrink: 0 }}>
      {/* 标题 */}
      <Stack direction="row" spacing={1} sx={{ mb: 1.5, alignItems: 'center' }}>
        <Zap size={14} style={{ color: '#fbbf24' }} />
        <Typography
          variant="caption"
          sx={{
            fontWeight: 600,
            textTransform: 'uppercase',
            letterSpacing: 1,
            color: 'text.secondary',
          }}
        >
          {t('trace.token.usage')}
        </Typography>
      </Stack>

      {/* 进度条 */}
      <Box
        sx={{
          width: '100%',
          height: 6,
          borderRadius: 3,
          overflow: 'hidden',
          mb: 2,
          bgcolor: 'action.hover',
          display: 'flex',
        }}
      >
        <Box
          sx={{
            height: '100%',
            width: `${inputPercent}%`,
            bgcolor: '#22d3ee',
            transition: 'width 300ms',
            borderRadius: '3px 0 0 3px',
          }}
        />
        <Box
          sx={{
            height: '100%',
            width: `${Math.max(100 - inputPercent, 0)}%`,
            bgcolor: '#a855f7',
            transition: 'width 300ms',
            borderRadius: '0 3px 3px 0',
          }}
        />
      </Box>

      {/* 数值卡片 */}
      <Box sx={{ display: 'grid', gridTemplateColumns: '1fr 1fr', gap: 1.5, mb: 1.5 }}>
        <StatCard
          label={t('trace.token.input')}
          value={formatTokens(tokenUsage.inputTokens)}
          color="#22d3ee"
        />
        <StatCard
          label={t('trace.token.output')}
          value={formatTokens(tokenUsage.outputTokens)}
          color="#a855f7"
        />
      </Box>

      {/* 底部汇总 */}
      <Table size="small" sx={{ '& .MuiTableCell-root': { border: 0, py: 0.5, px: 0.5 } }}>
        <TableBody>
          <TableRow>
            <TableCell sx={{ color: 'text.secondary', fontSize: 11, width: '40%' }}>
              {t('trace.token.total')}
            </TableCell>
            <TableCell
              sx={{
                fontFamily: 'monospace',
                fontWeight: 600,
                color: 'text.primary',
                fontSize: 12,
                textAlign: 'right',
              }}
            >
              {tokenUsage.totalTokens > 0 ? formatTokens(tokenUsage.totalTokens) : '-'}
            </TableCell>
          </TableRow>
          <TableRow>
            <TableCell sx={{ color: 'text.secondary', fontSize: 11 }}>
              {t('trace.token.context')}
            </TableCell>
            <TableCell
              sx={{
                fontFamily: 'monospace',
                fontWeight: 600,
                fontSize: 11,
                textAlign: 'right',
                color:
                  contextPercent > 80
                    ? 'error.main'
                    : contextPercent > 60
                      ? 'warning.main'
                      : 'text.secondary',
              }}
            >
              {tokenUsage.lastInputTokens > 0
                ? `${formatTokens(tokenUsage.lastInputTokens)} (${contextPercent.toFixed(1)}%)`
                : '-'}
            </TableCell>
          </TableRow>
          {tokenUsage.lastCompressedSaved > 0 && (
            <TableRow>
              <TableCell sx={{ color: 'success.main', fontSize: 11 }}>
                {t('trace.token.compressedSaved')}
              </TableCell>
              <TableCell
                sx={{
                  fontFamily: 'monospace',
                  fontWeight: 600,
                  fontSize: 11,
                  color: 'success.main',
                  textAlign: 'right',
                }}
              >
                {formatTokens(tokenUsage.lastCompressedSaved)}
              </TableCell>
            </TableRow>
          )}
          <TableRow>
            <TableCell sx={{ color: 'text.secondary', fontSize: 11 }}>迭代</TableCell>
            <TableCell
              sx={{
                fontFamily: 'monospace',
                fontWeight: 600,
                fontSize: 11,
                color: 'text.secondary',
                textAlign: 'right',
              }}
            >
              {currentIteration} / {maxIterations}
            </TableCell>
          </TableRow>
        </TableBody>
      </Table>
    </Box>
  );
}

function StatCard({ label, value, color }: { label: string; value: string; color: string }) {
  return (
    <Box
      sx={{
        display: 'flex',
        alignItems: 'center',
        gap: 1.5,
        px: 1.5,
        py: 1.25,
        borderRadius: 1.5,
        bgcolor: 'action.hover',
      }}
    >
      <Box sx={{ width: 8, height: 8, borderRadius: '50%', bgcolor: color, flexShrink: 0 }} />
      <Typography variant="caption" sx={{ color: 'text.secondary', fontSize: 11 }}>
        {label}
      </Typography>
      <Typography
        variant="caption"
        sx={{
          ml: 'auto',
          pl: 1,
          fontFamily: 'monospace',
          fontWeight: 600,
          color: 'text.primary',
          fontSize: 12,
        }}
      >
        {value}
      </Typography>
    </Box>
  );
}