import React, { useCallback, useEffect, useState } from 'react';

import { scanDinsarResults } from './api/dinsar';
import { extractDispResults } from './api/idl';
import { clearTaskLogs, deleteTaskLog, getActiveTasks, getRecentTasks, getTaskLogs } from './api/tasks';
import DinsarCatalogPanel from './components/DinsarCatalogPanel';

const card = {
  background: '#fff',
  padding: '12px',
  borderRadius: '8px',
  border: '1px solid #e2e8f0',
  marginBottom: '12px',
};

const PRODUCT_TASK_TYPES = [
  'SCAN_DINSAR',
  'PUBLISH_DINSAR_PRODUCTS',
  'REBUILD_DINSAR_CATALOG',
];

const TASK_TYPE_LABEL = {
  SCAN_DINSAR: 'D-InSAR结果扫描',
  PUBLISH_DINSAR_PRODUCTS: 'D-InSAR产物发布',
  REBUILD_DINSAR_CATALOG: 'D-InSAR目录重建',
};

const STATUS_LABEL = {
  PENDING: '等待中',
  RUNNING: '运行中',
  COMPLETED: '已完成',
  FAILED: '失败',
  CANCELLED: '已取消',
  CANCELED: '已取消',
};

function formatTaskType(taskType) {
  return TASK_TYPE_LABEL[taskType] || taskType || '-';
}

function formatStatus(status) {
  return STATUS_LABEL[status] || status || '-';
}

export default function DinsarProductsPanel({ readOnly = false, onJobQueued }) {
  const [extractRootDir, setExtractRootDir] = useState('');
  const [extractDestDir, setExtractDestDir] = useState('');
  const [extractResult, setExtractResult] = useState(null);
  const [extracting, setExtracting] = useState(false);
  const [actionMessage, setActionMessage] = useState('');
  const [actionError, setActionError] = useState(false);
  const [scanning, setScanning] = useState(false);

  const [activeTask, setActiveTask] = useState(null);
  const [recentTask, setRecentTask] = useState(null);
  const [taskLogs, setTaskLogs] = useState([]);
  const [taskLogsLoading, setTaskLogsLoading] = useState(false);
  const [taskLogActionLoading, setTaskLogActionLoading] = useState(false);
  const [taskLogDeletingId, setTaskLogDeletingId] = useState(null);
  const monitoredTask = activeTask || recentTask;
  const logTaskId = monitoredTask?.task_id || '';
  const showingRecentTask = !activeTask && !!recentTask;

  const loadActiveTask = useCallback(async () => {
    try {
      const data = await getActiveTasks();
      const tasks = Array.isArray(data) ? data : (data?.tasks || []);
      const relevantTask = tasks.find(task => PRODUCT_TASK_TYPES.includes(task.task_type)) || null;
      setActiveTask(relevantTask);
      return relevantTask;
    } catch {
      setActiveTask(null);
      return null;
    }
  }, []);

  const loadRecentTask = useCallback(async () => {
    try {
      const tasks = await getRecentTasks(PRODUCT_TASK_TYPES, [], 1, 0);
      const nextTask = Array.isArray(tasks) ? (tasks[0] || null) : null;
      setRecentTask(nextTask);
      return nextTask;
    } catch {
      setRecentTask(null);
      return null;
    }
  }, []);

  const loadTaskLogs = useCallback(async taskId => {
    if (!taskId) {
      setTaskLogs([]);
      return;
    }
    setTaskLogsLoading(true);
    try {
      const data = await getTaskLogs(taskId, 50, 0);
      setTaskLogs(data?.logs || []);
    } catch {
      setTaskLogs([]);
    } finally {
      setTaskLogsLoading(false);
    }
  }, []);

  const handleDeleteTaskLog = useCallback(async logId => {
    const taskId = logTaskId;
    if (!taskId || !logId || taskLogActionLoading) return;
    if (!window.confirm('确定要删除这条任务日志吗？')) return;

    setTaskLogDeletingId(logId);
    setTaskLogActionLoading(true);
    try {
      await deleteTaskLog(taskId, logId);
      await loadTaskLogs(taskId);
    } catch (error) {
      setActionMessage(`删除日志失败：${error?.response?.data?.detail || error.message}`);
      setActionError(true);
    } finally {
      setTaskLogDeletingId(null);
      setTaskLogActionLoading(false);
    }
  }, [logTaskId, loadTaskLogs, taskLogActionLoading]);

  const handleClearTaskLogs = useCallback(async () => {
    const taskId = logTaskId;
    if (!taskId || taskLogActionLoading || taskLogs.length === 0) return;
    if (!window.confirm(`确定要清空任务 ${taskId} 的全部日志吗？`)) return;

    setTaskLogActionLoading(true);
    try {
      await clearTaskLogs(taskId);
      await loadTaskLogs(taskId);
    } catch (error) {
      setActionMessage(`清空日志失败：${error?.response?.data?.detail || error.message}`);
      setActionError(true);
    } finally {
      setTaskLogActionLoading(false);
    }
  }, [logTaskId, loadTaskLogs, taskLogActionLoading, taskLogs.length]);

  const refreshMonitor = useCallback(async () => {
    const [nextActiveTask, nextRecentTask] = await Promise.all([
      loadActiveTask(),
      loadRecentTask(),
    ]);
    const nextTaskId = nextActiveTask?.task_id || nextRecentTask?.task_id || '';
    await loadTaskLogs(nextTaskId);
  }, [loadActiveTask, loadRecentTask, loadTaskLogs]);

  useEffect(() => {
    refreshMonitor();
  }, [refreshMonitor]);

  const handleExtract = async () => {
    if (!extractRootDir.trim()) return;
    setExtracting(true);
    setExtractResult(null);
    setActionMessage('');
    setActionError(false);
    try {
      const result = await extractDispResults(extractRootDir.trim(), extractDestDir.trim() || null);
      setExtractResult(result);
    } catch (err) {
      setExtractResult({ error: err?.response?.data?.detail || err.message });
    } finally {
      setExtracting(false);
    }
  };

  const handleScan = async () => {
    if (readOnly) return;
    setScanning(true);
    setActionMessage('');
    setActionError(false);
    try {
      const result = await scanDinsarResults();
      setActionMessage(result?.message || `D-InSAR结果扫描任务已入队：${result?.task_id || '-'}`);
      if (result?.task_id) {
        onJobQueued?.(result.task_id);
      }
      await refreshMonitor();
    } catch (err) {
      setActionError(true);
      setActionMessage(err?.response?.data?.detail || err.message || 'D-InSAR结果扫描失败');
    } finally {
      setScanning(false);
    }
  };

  return (
    <div style={{ padding: '16px', maxWidth: 960 }}>
      <div style={card}>
        <strong style={{ fontSize: 14, display: 'block', marginBottom: 10 }}>D-InSAR 产物提取与重扫</strong>

        <div
          style={{
            fontSize: 12,
            color: '#475569',
            lineHeight: 1.6,
            marginBottom: 10,
            padding: '8px 10px',
            background: '#f8fafc',
            border: '1px solid #e2e8f0',
            borderRadius: 6,
          }}
        >
          这里负责把生产目录中的位移结果提取为标准成果包，并触发结果重扫、发布和编目。生产运行与参数配置已独立放到“D-InSAR生产”选项卡。
        </div>

        <div style={{ display: 'flex', gap: 10, flexWrap: 'wrap', marginBottom: 8 }}>
          <input
            value={extractRootDir}
            onChange={event => setExtractRootDir(event.target.value)}
            placeholder="结果根目录"
            style={{ flex: 2, minWidth: 220, padding: '5px 8px', borderRadius: 4, border: '1px solid #e2e8f0', fontSize: 13 }}
          />
          <input
            value={extractDestDir}
            onChange={event => setExtractDestDir(event.target.value)}
            placeholder="目标目录（可选）"
            style={{ flex: 1, minWidth: 180, padding: '5px 8px', borderRadius: 4, border: '1px solid #e2e8f0', fontSize: 13 }}
          />
          <button
            onClick={handleExtract}
            disabled={extracting || !extractRootDir.trim()}
            style={{ padding: '5px 14px', borderRadius: 4, border: 'none', background: '#3b82f6', color: '#fff', cursor: 'pointer', fontSize: 13 }}
          >
            {extracting ? '提取中...' : '提取位移结果'}
          </button>
          <button
            onClick={handleScan}
            disabled={readOnly || scanning}
            style={{
              padding: '5px 14px',
              borderRadius: 4,
              border: '1px solid #e2e8f0',
              background: '#f8fafc',
              cursor: readOnly ? 'not-allowed' : 'pointer',
              fontSize: 13,
            }}
          >
            {scanning ? '重扫中...' : '重扫结果'}
          </button>
        </div>

        {actionMessage && (
          <div style={{ marginBottom: 8, fontSize: 12, color: actionError ? '#dc2626' : '#166534' }}>
            {actionMessage}
          </div>
        )}

        {extractResult && (
          <div
            style={{
              fontSize: 12,
              padding: '6px 10px',
              background: extractResult.error ? '#fef2f2' : '#f0fdf4',
              borderRadius: 4,
            }}
          >
            {extractResult.error ? (
              <span style={{ color: '#ef4444' }}>提取失败：{extractResult.error}</span>
            ) : (
              <div style={{ display: 'flex', flexDirection: 'column', gap: 4, color: '#16a34a' }}>
                <span>
                  提取完成：复制 {extractResult.copied || 0} 个文件，覆盖 {extractResult.overwritten || 0} 个文件。
                </span>
                {extractResult.catalog?.attempted && extractResult.catalog?.status === 'ok' && (
                  <span style={{ color: '#166534' }}>
                    成果目录已同步：发布 {extractResult.catalog?.publish?.processed || 0} 项，重建登记 {extractResult.catalog?.rebuild?.registered || 0} 项。
                  </span>
                )}
                {extractResult.catalog?.attempted && extractResult.catalog?.status === 'error' && (
                  <span style={{ color: '#b45309' }}>
                    标准成果包目录同步失败：{extractResult.catalog?.message}
                  </span>
                )}
              </div>
            )}
          </div>
        )}
      </div>

      <div style={card}>
        <div style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center', marginBottom: 10 }}>
          <strong style={{ fontSize: 14 }}>产物任务监控</strong>
          <button
            onClick={refreshMonitor}
            style={{
              fontSize: 12,
              padding: '3px 10px',
              borderRadius: 4,
              border: '1px solid #e2e8f0',
              cursor: 'pointer',
              background: '#f8fafc',
            }}
          >
            刷新
          </button>
        </div>
        <div style={{ fontSize: 11, color: '#94a3b8', marginBottom: 10 }}>
          任务状态与日志改为手动刷新，避免页面持续轮询。
        </div>

        {!monitoredTask ? (
          <div style={{ fontSize: 12, color: '#94a3b8' }}>当前没有正在执行的产物处理任务。</div>
        ) : (
          <div
            style={{
              padding: '8px 10px',
              background: showingRecentTask ? '#eff6ff' : '#fefce8',
              borderRadius: 6,
              border: `1px solid ${showingRecentTask ? '#bfdbfe' : '#fde68a'}`,
            }}
          >
            <div
              style={{
                fontSize: 12,
                fontWeight: 600,
                color: showingRecentTask ? '#1d4ed8' : '#92400e',
                marginBottom: 4,
              }}
            >
              {showingRecentTask ? '最近一次任务' : '当前任务'}
            </div>
            <div style={{ fontSize: 12, color: showingRecentTask ? '#1e40af' : '#78350f', wordBreak: 'break-all' }}>
              {monitoredTask.task_id} - {formatTaskType(monitoredTask.task_type)} - {formatStatus(monitoredTask.status)} - {monitoredTask.message}
            </div>
            {monitoredTask.progress != null && (
              <div style={{ marginTop: 6 }}>
                <div
                  style={{
                    height: 6,
                    background: showingRecentTask ? '#dbeafe' : '#fde68a',
                    borderRadius: 3,
                    overflow: 'hidden',
                  }}
                >
                  <div
                    style={{
                      height: '100%',
                      width: `${monitoredTask.progress}%`,
                      background: showingRecentTask ? '#3b82f6' : '#f59e0b',
                      transition: 'width 0.3s',
                    }}
                  />
                </div>
                <div style={{ fontSize: 11, color: showingRecentTask ? '#1d4ed8' : '#92400e', marginTop: 2 }}>{monitoredTask.progress}%</div>
              </div>
            )}

            <div
              style={{
                marginTop: 8,
                background: '#fff',
                border: `1px solid ${showingRecentTask ? '#bfdbfe' : '#fde68a'}`,
                borderRadius: 6,
                padding: '8px 10px',
              }}
            >
              <div style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center', gap: 8, marginBottom: 6 }}>
                <div style={{ fontSize: 11, fontWeight: 600, color: showingRecentTask ? '#1d4ed8' : '#92400e' }}>
                  {showingRecentTask ? '最近一次任务日志' : '当前任务日志'}
                </div>
                {!readOnly && (
                  <button
                    onClick={handleClearTaskLogs}
                    disabled={taskLogActionLoading || taskLogs.length === 0}
                    style={{
                      fontSize: 11,
                      padding: '2px 8px',
                      borderRadius: 4,
                      border: '1px solid #fcd34d',
                      background: taskLogActionLoading || taskLogs.length === 0 ? '#fef3c7' : '#fff7ed',
                      color: '#9a3412',
                      cursor: taskLogActionLoading || taskLogs.length === 0 ? 'not-allowed' : 'pointer',
                    }}
                  >
                    {taskLogActionLoading && taskLogDeletingId == null ? '清空中...' : '清空日志'}
                  </button>
                )}
              </div>
              {taskLogsLoading ? (
                <div style={{ fontSize: 11, color: showingRecentTask ? '#1d4ed8' : '#a16207' }}>加载中...</div>
              ) : taskLogs.length === 0 ? (
                <div style={{ fontSize: 11, color: showingRecentTask ? '#1d4ed8' : '#a16207' }}>暂无日志。</div>
              ) : (
                <div style={{ maxHeight: 220, overflowY: 'auto', display: 'flex', flexDirection: 'column', gap: 6 }}>
                  {taskLogs.map((log, index) => (
                    <div
                      key={log.id || `${log.timestamp || 'log'}-${index}`}
                      style={{
                        display: 'flex',
                        justifyContent: 'space-between',
                        gap: 8,
                        alignItems: 'flex-start',
                      }}
                    >
                      <div
                        style={{
                          flex: 1,
                          minWidth: 0,
                          fontSize: 11,
                          lineHeight: 1.45,
                          color: log.level === 'ERROR' ? '#b91c1c' : log.level === 'WARNING' ? '#b45309' : '#334155',
                        }}
                      >
                        <div style={{ color: '#64748b' }}>
                          {(log.timestamp || '').replace('T', ' ').replace('Z', '')} [{log.level}]
                        </div>
                        <div style={{ whiteSpace: 'pre-wrap', wordBreak: 'break-all' }}>{log.message}</div>
                      </div>
                      {!readOnly && (
                        <button
                          onClick={() => handleDeleteTaskLog(log.id)}
                          disabled={taskLogActionLoading || !log.id}
                          style={{
                            flexShrink: 0,
                            fontSize: 11,
                            padding: '2px 8px',
                            borderRadius: 4,
                            border: '1px solid #fecaca',
                            background: '#fef2f2',
                            color: '#b91c1c',
                            cursor: taskLogActionLoading || !log.id ? 'not-allowed' : 'pointer',
                          }}
                        >
                          {taskLogDeletingId === log.id ? '删除中...' : '删除'}
                        </button>
                      )}
                    </div>
                  ))}
                </div>
              )}
            </div>
          </div>
        )}
      </div>

      <DinsarCatalogPanel
        readOnly={readOnly}
        initialSourceDir={extractRootDir}
        onTaskQueued={onJobQueued}
      />
    </div>
  );
}