import { Title } from "@components/title";
import {
  Dialog,
  DialogContent,
  DialogActions,
  Button,
  Select,
  MenuItem,
  FormControl,
  InputLabel,
  TextField,
  Box,
  Typography,
  Fade,
  IconButton,
} from "@mui/material";
import CloseIcon from "@mui/icons-material/Close";
import { useEffect, useState } from "react";
import { apiFetch } from "@/lib/apiFetch";
import { config, NETWORK_NAME } from "@/config/config";

interface ProjectSelectorProps {
  open: boolean;
  onSelect: (
    projectId: string,
    workspace: string,
    networkName: string,
    extent: number[],
  ) => void;
  onClose?: () => void;
}

type ProjectOption = {
  id: string;
  label: string;
  workspace: string;
  networkName: string;
  extent: number[];
  description?: string | null;
  status?: string | null;
  projectRole?: string | null;
};

export const ProjectSelector: React.FC<ProjectSelectorProps> = ({
  open,
  onSelect,
  onClose,
}) => {
  const [projects, setProjects] = useState<ProjectOption[]>([]);
  const [isLoading, setIsLoading] = useState(false);
  const [loadError, setLoadError] = useState<string | null>(null);
  const [projectId, setProjectId] = useState("");
  const [projectIdError, setProjectIdError] = useState<string | null>(null);
  const [workspace, setWorkspace] = useState(config.MAP_WORKSPACE);
  const [networkName, setNetworkName] = useState(NETWORK_NAME || "tjwater");
  const [extent, setExtent] = useState<number[]>(config.MAP_EXTENT);
  const [customMode, setCustomMode] = useState(false);

  useEffect(() => {
    const fetchProjects = async () => {
      setIsLoading(true);
      setLoadError(null);
      try {
        const response = await apiFetch(
          `${config.BACKEND_URL}/api/v1/meta/projects`,
        );
        if (!response.ok) {
          throw new Error(`HTTP ${response.status}`);
        }
        const data = await response.json();
        const mapped: ProjectOption[] = Array.isArray(data)
          ? data.map((item) => {
              const bbox = Array.isArray(item.map_extent?.bbox)
                ? item.map_extent.bbox.map((value: number) => Number(value))
                : null;
              return {
                id: item.project_id,
                label: item.name || item.code || item.project_id,
                workspace: item.gs_workspace || config.MAP_WORKSPACE,
                networkName: item.code || NETWORK_NAME || config.MAP_WORKSPACE,
                extent:
                  bbox && bbox.length === 4 ? bbox : config.MAP_EXTENT,
                description: item.description,
                status: item.status,
                projectRole: item.project_role,
              };
            })
          : [];
        setProjects(mapped);
        const savedProjectId = localStorage.getItem("active_project");
        const initial =
          (savedProjectId &&
            mapped.find((project) => project.id === savedProjectId)) ||
          mapped[0];
        if (initial) {
          setProjectId(initial.id);
          setWorkspace(initial.workspace);
          setNetworkName(initial.networkName);
          setExtent(initial.extent);
          setCustomMode(false);
        } else {
          setCustomMode(true);
        }
      } catch (error) {
        console.error("Failed to load projects:", error);
        setLoadError("项目列表加载失败，请使用自定义配置");
        setCustomMode(true);
      } finally {
        setIsLoading(false);
      }
    };

    fetchProjects();
  }, []);

  const handleConfirm = () => {
    if (!projectId.trim()) {
      setProjectIdError("项目 ID 不能为空");
      return;
    }
    setProjectIdError(null);
    onSelect(projectId.trim(), workspace, networkName, extent);
  };

  return (
    <Dialog
      open={open}
      disableEscapeKeyDown={!onClose}
      onClose={onClose ? onClose : undefined}
      slotProps={{
        paper: {
          sx: {
            borderRadius: 2,
            padding: 2,
            minWidth: 400,
            background: "rgba(255, 255, 255, 0.95)",
            backdropFilter: "blur(10px)",
            position: "relative",
          },
        },
      }}
      slots={{ transition: Fade }}
      transitionDuration={500}
    >
      {onClose && (
        <IconButton
          aria-label="close"
          onClick={onClose}
          sx={{
            position: "absolute",
            right: 8,
            top: 8,
            color: (theme) => theme.palette.grey[500],
          }}
        >
          <CloseIcon />
        </IconButton>
      )}
      <Box
        sx={{
          display: "flex",
          flexDirection: "column",
          alignItems: "center",
          mb: 2,
        }}
      >
        <Box sx={{ transform: "scale(1.5)", mb: 2, mt: 1 }}>
          <Title />
        </Box>
        <Typography variant="subtitle1" color="text.secondary">
          请选择项目环境
        </Typography>
      </Box>

      <DialogContent
        sx={{ display: "flex", flexDirection: "column", gap: 3, pt: 1 }}
      >
        {!customMode ? (
          <FormControl fullWidth variant="outlined">
            <InputLabel>项目</InputLabel>
            <Select
              value={projectId}
              label="项目"
              onChange={(e) => {
                const val = e.target.value;
                if (val === "custom") {
                  setCustomMode(true);
                  setProjectIdError(null);
                } else {
                  const p = projects.find((p) => p.id === val);
                  if (p) {
                    setProjectId(p.id);
                    setWorkspace(p.workspace);
                    setNetworkName(p.networkName);
                    setExtent(p.extent);
                    setProjectIdError(null);
                  }
                }
              }}
            >
              {projects.length === 0 && (
                <MenuItem value="" disabled>
                  <Typography variant="body2" color="text.secondary">
                    {isLoading ? "正在加载项目..." : "暂无可用项目"}
                  </Typography>
                </MenuItem>
              )}
              {projects.map((p) => (
                <MenuItem key={p.id} value={p.id}>
                  <Box sx={{ display: "flex", flexDirection: "column" }}>
                    <Typography variant="body1">{p.label}</Typography>
                    <Typography variant="caption" color="text.secondary">
                      工作区: {p.workspace} | 管网: {p.networkName}
                    </Typography>
                    {(p.status || p.projectRole) && (
                      <Typography variant="caption" color="text.secondary">
                        {p.status ? `状态: ${p.status}` : ""}
                        {p.status && p.projectRole ? " | " : ""}
                        {p.projectRole ? `角色: ${p.projectRole}` : ""}
                      </Typography>
                    )}
                  </Box>
                </MenuItem>
              ))}
              <MenuItem value="custom">
                <Typography variant="body1">自定义配置...</Typography>
              </MenuItem>
            </Select>
            {loadError && (
              <Typography variant="caption" color="error">
                {loadError}
              </Typography>
            )}
          </FormControl>
        ) : (
          <Box sx={{ display: "flex", flexDirection: "column", gap: 2 }}>
            <TextField
              label="项目 ID"
              value={projectId}
              onChange={(e) => {
                setProjectId(e.target.value);
                setProjectIdError(null);
              }}
              fullWidth
              helperText={
                projectIdError || "例如: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
              }
              error={Boolean(projectIdError)}
            />
            <TextField
              label="Geoserver 工作区"
              value={workspace}
              onChange={(e) => setWorkspace(e.target.value)}
              fullWidth
              helperText="例如: tjwater"
            />
            <TextField
              label="管网名称"
              value={networkName}
              onChange={(e) => setNetworkName(e.target.value)}
              fullWidth
              helperText="例如: tjwater"
            />
            <Button
              onClick={() => setCustomMode(false)}
              size="small"
              sx={{ alignSelf: "flex-start" }}
            >
              返回列表
            </Button>
          </Box>
        )}
      </DialogContent>
      <DialogActions sx={{ px: 3, pb: 2 }}>
        <Button
          onClick={handleConfirm}
          variant="contained"
          fullWidth
          size="large"
          sx={{
            textTransform: "none",
            borderRadius: 2,
            fontWeight: "bold",
          }}
        >
          进入系统
        </Button>
      </DialogActions>
    </Dialog>
  );
};