"use client";

import { useState, useEffect } from "react";
import { client } from "@/lib/api";
import { useBank } from "@/lib/bank-context";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import {
  Table,
  TableBody,
  TableCell,
  TableHead,
  TableHeader,
  TableRow,
} from "@/components/ui/table";
import { X } from "lucide-react";

export function DocumentsView() {
  const { currentBank } = useBank();
  const [documents, setDocuments] = useState<any[]>([]);
  const [loading, setLoading] = useState(false);
  const [searchQuery, setSearchQuery] = useState("");
  const [total, setTotal] = useState(0);

  // Document view panel state
  const [selectedDocument, setSelectedDocument] = useState<any>(null);
  const [loadingDocument, setLoadingDocument] = useState(false);

  const loadDocuments = async () => {
    if (!currentBank) return;

    setLoading(true);
    try {
      const data: any = await client.listDocuments({
        bank_id: currentBank,
        q: searchQuery,
        limit: 100,
      });
      setDocuments(data.items || []);
      setTotal(data.total || 0);
    } catch (error) {
      console.error("Error loading documents:", error);
      alert("Error loading documents: " + (error as Error).message);
    } finally {
      setLoading(false);
    }
  };

  const viewDocumentText = async (documentId: string) => {
    if (!currentBank) return;

    setLoadingDocument(true);
    setSelectedDocument({ id: documentId }); // Set placeholder to show loading

    try {
      const doc: any = await client.getDocument(documentId, currentBank);
      setSelectedDocument(doc);
    } catch (error) {
      console.error("Error loading document:", error);
      alert("Error loading document: " + (error as Error).message);
      setSelectedDocument(null);
    } finally {
      setLoadingDocument(false);
    }
  };

  // Auto-load documents when component mounts
  useEffect(() => {
    if (currentBank) {
      loadDocuments();
    }
  }, [currentBank]);

  return (
    <div>
      {/* Documents List Section */}
      {loading ? (
        <div className="flex items-center justify-center py-20">
          <div className="text-center">
            <div className="text-4xl mb-2">⏳</div>
            <div className="text-sm text-muted-foreground">Loading documents...</div>
          </div>
        </div>
      ) : documents.length > 0 ? (
        <div className="mb-4 text-sm text-muted-foreground">{total} total documents</div>
      ) : (
        <div className="flex items-center justify-center py-20">
          <div className="text-center">
            <div className="text-4xl mb-2">📄</div>
            <div className="text-sm text-muted-foreground">No documents found</div>
          </div>
        </div>
      )}

      {/* Documents List and Detail Panel */}
      {documents.length > 0 && (
        <>
          {/* Documents Table */}
          <div className="w-full">
            <div className="px-5 mb-4">
              <Input
                type="text"
                value={searchQuery}
                onChange={(e) => setSearchQuery(e.target.value)}
                placeholder="Search documents (ID)..."
                className="max-w-2xl"
              />
            </div>

            <div className="overflow-x-auto px-5 pb-5">
              <Table>
                <TableHeader>
                  <TableRow>
                    <TableHead>Document ID</TableHead>
                    <TableHead>Created</TableHead>
                    <TableHead>Context</TableHead>
                    <TableHead>Text Length</TableHead>
                    <TableHead>Memory Units</TableHead>
                    <TableHead>Actions</TableHead>
                  </TableRow>
                </TableHeader>
                <TableBody>
                  {documents.length > 0 ? (
                    documents.map((doc) => (
                      <TableRow
                        key={doc.id}
                        className={`cursor-pointer hover:bg-muted/50 ${selectedDocument?.id === doc.id ? "bg-primary/10" : ""}`}
                        onClick={() => viewDocumentText(doc.id)}
                      >
                        <TableCell title={doc.id} className="text-card-foreground">
                          {doc.id.length > 30 ? doc.id.substring(0, 30) + "..." : doc.id}
                        </TableCell>
                        <TableCell className="text-card-foreground">
                          {doc.created_at ? new Date(doc.created_at).toLocaleString() : "N/A"}
                        </TableCell>
                        <TableCell className="text-card-foreground">
                          {doc.retain_params?.context || "-"}
                        </TableCell>
                        <TableCell className="text-card-foreground">
                          {doc.text_length?.toLocaleString()} chars
                        </TableCell>
                        <TableCell className="text-card-foreground">
                          {doc.memory_unit_count}
                        </TableCell>
                        <TableCell>
                          <Button
                            onClick={(e) => {
                              e.stopPropagation();
                              viewDocumentText(doc.id);
                            }}
                            size="sm"
                            variant={selectedDocument?.id === doc.id ? "default" : "secondary"}
                            title="View original text"
                          >
                            View Text
                          </Button>
                        </TableCell>
                      </TableRow>
                    ))
                  ) : (
                    <TableRow>
                      <TableCell colSpan={6} className="text-center">
                        Click "Load Documents" to view data
                      </TableCell>
                    </TableRow>
                  )}
                </TableBody>
              </Table>
            </div>
          </div>

          {/* Document Detail Panel - Fixed on Right */}
          {selectedDocument && (
            <div className="fixed right-0 top-0 h-screen w-[420px] bg-card border-l-2 border-primary shadow-2xl z-50 overflow-y-auto animate-in slide-in-from-right duration-300 ease-out">
              <div className="p-5">
                {/* Header with close button */}
                <div className="flex justify-between items-center mb-6 pb-4 border-b border-border">
                  <div>
                    <h3 className="text-xl font-bold text-foreground">Document Details</h3>
                    <p className="text-sm text-muted-foreground mt-1">
                      Original document text and metadata
                    </p>
                  </div>
                  <Button
                    variant="secondary"
                    size="sm"
                    onClick={() => setSelectedDocument(null)}
                    className="h-9 px-3 gap-2"
                  >
                    <X className="h-4 w-4" />
                    Close
                  </Button>
                </div>

                {loadingDocument ? (
                  <div className="flex items-center justify-center py-20">
                    <div className="text-center">
                      <div className="text-4xl mb-2">⏳</div>
                      <div className="text-sm text-muted-foreground">Loading document...</div>
                    </div>
                  </div>
                ) : (
                  <div className="space-y-5">
                    {/* Document ID */}
                    <div className="p-4 bg-muted/50 rounded-lg">
                      <div className="text-xs font-bold text-muted-foreground uppercase mb-2">
                        Document ID
                      </div>
                      <div className="text-sm font-mono break-all text-card-foreground">
                        {selectedDocument.id}
                      </div>
                    </div>

                    {/* Created & Memory Units */}
                    {selectedDocument.created_at && (
                      <div className="grid grid-cols-2 gap-4">
                        <div className="p-4 bg-muted/50 rounded-lg">
                          <div className="text-xs font-bold text-muted-foreground uppercase mb-2">
                            Created
                          </div>
                          <div className="text-sm font-medium text-card-foreground">
                            {new Date(selectedDocument.created_at).toLocaleString()}
                          </div>
                        </div>
                        <div className="p-4 bg-muted/50 rounded-lg">
                          <div className="text-xs font-bold text-muted-foreground uppercase mb-2">
                            Memory Units
                          </div>
                          <div className="text-sm font-medium text-card-foreground">
                            {selectedDocument.memory_unit_count}
                          </div>
                        </div>
                      </div>
                    )}

                    {/* Text Length */}
                    {selectedDocument.original_text && (
                      <div className="p-4 bg-muted/50 rounded-lg">
                        <div className="text-xs font-bold text-muted-foreground uppercase mb-2">
                          Text Length
                        </div>
                        <div className="text-sm font-medium text-card-foreground">
                          {selectedDocument.original_text.length.toLocaleString()} characters
                        </div>
                      </div>
                    )}

                    {/* Retain Parameters */}
                    {selectedDocument.retain_params && (
                      <div className="p-4 bg-muted/50 rounded-lg">
                        <div className="text-xs font-bold text-muted-foreground uppercase mb-2">
                          Retain Parameters
                        </div>
                        <div className="text-sm space-y-2 text-card-foreground">
                          {selectedDocument.retain_params.context && (
                            <div>
                              <span className="font-semibold">Context:</span>{" "}
                              {selectedDocument.retain_params.context}
                            </div>
                          )}
                          {selectedDocument.retain_params.event_date && (
                            <div>
                              <span className="font-semibold">Event Date:</span>{" "}
                              {new Date(selectedDocument.retain_params.event_date).toLocaleString()}
                            </div>
                          )}
                          {selectedDocument.retain_params.metadata && (
                            <div className="mt-2">
                              <span className="font-semibold">Metadata:</span>
                              <pre className="mt-1 text-xs bg-background p-2 rounded text-card-foreground">
                                {JSON.stringify(selectedDocument.retain_params.metadata, null, 2)}
                              </pre>
                            </div>
                          )}
                        </div>
                      </div>
                    )}

                    {/* Original Text */}
                    {selectedDocument.original_text && (
                      <div>
                        <div className="text-xs font-bold text-muted-foreground uppercase mb-2">
                          Original Text
                        </div>
                        <div className="p-4 bg-muted/50 rounded-lg border border-border max-h-[400px] overflow-y-auto">
                          <pre className="text-sm whitespace-pre-wrap font-mono leading-relaxed text-card-foreground">
                            {selectedDocument.original_text}
                          </pre>
                        </div>
                      </div>
                    )}
                  </div>
                )}
              </div>
            </div>
          )}
        </>
      )}
    </div>
  );
}