import { useState } from "react";
import { useTranslation } from "react-i18next";
import {
  Card,
  CardContent,
  CardDescription,
  CardHeader,
  CardTitle,
} from "@/components/ui/card";
import {
  Table,
  TableBody,
  TableCell,
  TableHead,
  TableHeader,
  TableRow,
} from "@/components/ui/table";
import { Button } from "@/components/ui/button";
import { Alert, AlertDescription } from "@/components/ui/alert";
import {
  Dialog,
  DialogContent,
  DialogDescription,
  DialogFooter,
  DialogHeader,
  DialogTitle,
} from "@/components/ui/dialog";
import { useModelPricing, useDeleteModelPricing } from "@/lib/query/usage";
import { PricingEditModal } from "./PricingEditModal";
import type { ModelPricing } from "@/types/usage";
import { Plus, Pencil, Trash2, ChevronDown, ChevronRight } from "lucide-react";

export function PricingConfigPanel() {
  const { t } = useTranslation();
  const { data: pricing, isLoading, error } = useModelPricing();
  const deleteMutation = useDeleteModelPricing();
  const [editingModel, setEditingModel] = useState<ModelPricing | null>(null);
  const [isAddingNew, setIsAddingNew] = useState(false);
  const [deleteConfirm, setDeleteConfirm] = useState<string | null>(null);
  const [isExpanded, setIsExpanded] = useState(false);

  const handleDelete = (modelId: string) => {
    deleteMutation.mutate(modelId, {
      onSuccess: () => {
        setDeleteConfirm(null);
      },
    });
  };

  const handleAddNew = () => {
    setIsAddingNew(true);
    setEditingModel({
      modelId: "",
      displayName: "",
      inputCostPerMillion: "0",
      outputCostPerMillion: "0",
      cacheReadCostPerMillion: "0",
      cacheCreationCostPerMillion: "0",
    });
  };

  if (isLoading) {
    return (
      <Card className="border-none bg-transparent p-0 shadow-none">
        <CardHeader
          className="cursor-pointer"
          onClick={() => setIsExpanded(!isExpanded)}
        >
          <div className="flex items-center gap-2">
            <ChevronRight className="h-4 w-4" />
            <CardTitle className="text-base">
              {t("usage.modelPricing", "模型定价")}
            </CardTitle>
          </div>
        </CardHeader>
      </Card>
    );
  }

  if (error) {
    return (
      <Card className="border-none bg-transparent p-0 shadow-none">
        <CardHeader
          className="cursor-pointer"
          onClick={() => setIsExpanded(!isExpanded)}
        >
          <div className="flex items-center gap-2">
            {isExpanded ? (
              <ChevronDown className="h-4 w-4" />
            ) : (
              <ChevronRight className="h-4 w-4" />
            )}
            <CardTitle className="text-base">
              {t("usage.modelPricing", "模型定价")}
            </CardTitle>
          </div>
        </CardHeader>
        {isExpanded && (
          <CardContent>
            <Alert variant="destructive">
              <AlertDescription>
                {t("usage.loadPricingError", "加载定价数据失败")}:{" "}
                {String(error)}
              </AlertDescription>
            </Alert>
          </CardContent>
        )}
      </Card>
    );
  }

  return (
    <Card className="border-none bg-transparent shadow-none">
      <CardHeader
        className="cursor-pointer select-none"
        onClick={() => setIsExpanded(!isExpanded)}
      >
        <div className="flex items-center justify-between">
          <div className="flex items-center gap-2">
            {isExpanded ? (
              <ChevronDown className="h-4 w-4 text-muted-foreground" />
            ) : (
              <ChevronRight className="h-4 w-4 text-muted-foreground" />
            )}
            <div>
              <CardTitle className="text-base">
                {t("usage.modelPricing", "模型定价")}
                {pricing && pricing.length > 0 && (
                  <span className="ml-2 text-sm font-normal text-muted-foreground">
                    ({pricing.length})
                  </span>
                )}
              </CardTitle>
              {!isExpanded && (
                <CardDescription className="mt-1">
                  {t(
                    "usage.modelPricingDesc",
                    "配置各模型的 Token 成本（每百万 tokens 的 USD 价格，支持 * 与 ? 通配）",
                  )}
                </CardDescription>
              )}
            </div>
          </div>
          <Button
            onClick={(e) => {
              e.stopPropagation();
              handleAddNew();
            }}
            size="sm"
          >
            <Plus className="mr-1 h-4 w-4" />
            {t("common.add", "新增")}
          </Button>
        </div>
      </CardHeader>

      {isExpanded && (
        <CardContent>
          {!pricing || pricing.length === 0 ? (
            <Alert>
              <AlertDescription>
                {t(
                  "usage.noPricingData",
                  '暂无定价数据。点击"新增"添加模型定价配置。',
                )}
              </AlertDescription>
            </Alert>
          ) : (
            <div className="rounded-md bg-card/60 shadow-sm">
              <Table>
                <TableHeader>
                  <TableRow>
                    <TableHead>{t("usage.model", "模型")}</TableHead>
                    <TableHead>{t("usage.displayName", "显示名称")}</TableHead>
                    <TableHead className="text-right">
                      {t("usage.inputCost", "输入成本")}
                    </TableHead>
                    <TableHead className="text-right">
                      {t("usage.outputCost", "输出成本")}
                    </TableHead>
                    <TableHead className="text-right">
                      {t("usage.cacheReadCost", "缓存读取")}
                    </TableHead>
                    <TableHead className="text-right">
                      {t("usage.cacheWriteCost", "缓存写入")}
                    </TableHead>
                    <TableHead className="text-right">
                      {t("common.actions", "操作")}
                    </TableHead>
                  </TableRow>
                </TableHeader>
                <TableBody>
                  {pricing.map((model) => (
                    <TableRow key={model.modelId}>
                      <TableCell className="font-mono text-sm">
                        {model.modelId}
                      </TableCell>
                      <TableCell>{model.displayName}</TableCell>
                      <TableCell className="text-right font-mono text-sm">
                        ${model.inputCostPerMillion}
                      </TableCell>
                      <TableCell className="text-right font-mono text-sm">
                        ${model.outputCostPerMillion}
                      </TableCell>
                      <TableCell className="text-right font-mono text-sm">
                        ${model.cacheReadCostPerMillion}
                      </TableCell>
                      <TableCell className="text-right font-mono text-sm">
                        ${model.cacheCreationCostPerMillion}
                      </TableCell>
                      <TableCell className="text-right">
                        <div className="flex justify-end gap-1">
                          <Button
                            variant="ghost"
                            size="icon"
                            onClick={() => {
                              setIsAddingNew(false);
                              setEditingModel(model);
                            }}
                            title={t("common.edit", "编辑")}
                          >
                            <Pencil className="h-4 w-4" />
                          </Button>
                          <Button
                            variant="ghost"
                            size="icon"
                            onClick={() => setDeleteConfirm(model.modelId)}
                            title={t("common.delete", "删除")}
                            className="text-destructive hover:text-destructive"
                          >
                            <Trash2 className="h-4 w-4" />
                          </Button>
                        </div>
                      </TableCell>
                    </TableRow>
                  ))}
                </TableBody>
              </Table>
            </div>
          )}
        </CardContent>
      )}

      {editingModel && (
        <PricingEditModal
          model={editingModel}
          isNew={isAddingNew}
          onClose={() => {
            setEditingModel(null);
            setIsAddingNew(false);
          }}
        />
      )}

      <Dialog
        open={!!deleteConfirm}
        onOpenChange={() => setDeleteConfirm(null)}
      >
        <DialogContent>
          <DialogHeader>
            <DialogTitle>
              {t("usage.deleteConfirmTitle", "确认删除")}
            </DialogTitle>
            <DialogDescription>
              {t(
                "usage.deleteConfirmDesc",
                "确定要删除此模型定价配置吗？此操作无法撤销。",
              )}
            </DialogDescription>
          </DialogHeader>
          <DialogFooter>
            <Button variant="outline" onClick={() => setDeleteConfirm(null)}>
              {t("common.cancel", "取消")}
            </Button>
            <Button
              variant="destructive"
              onClick={() => deleteConfirm && handleDelete(deleteConfirm)}
              disabled={deleteMutation.isPending}
            >
              {deleteMutation.isPending
                ? t("common.deleting", "删除中...")
                : t("common.delete", "删除")}
            </Button>
          </DialogFooter>
        </DialogContent>
      </Dialog>
    </Card>
  );
}
