"use client";

import { useState, useRef } from "react";
import { useNavigation } from "../navigation";
import { Check, ChevronRight, Maximize2, Minimize2, X as XIcon } from "lucide-react";
import { cn } from "@multica/ui/lib/utils";
import { toast } from "sonner";
import type { IssueStatus, IssuePriority, IssueAssigneeType } from "@multica/core/types";
import {
  Dialog,
  DialogContent,
  DialogTitle,
} from "@multica/ui/components/ui/dialog";
import { Tooltip, TooltipTrigger, TooltipContent } from "@multica/ui/components/ui/tooltip";
import { Button } from "@multica/ui/components/ui/button";
import { ContentEditor, type ContentEditorRef, TitleEditor, useFileDropZone, FileDropOverlay } from "../editor";
import { StatusIcon, StatusPicker, PriorityPicker, AssigneePicker, DueDatePicker } from "../issues/components";
import { BacklogAgentHintContent } from "../issues/components/backlog-agent-hint-dialog";
import { ProjectPicker } from "../projects/components/project-picker";
import { useCurrentWorkspace, useWorkspacePaths } from "@multica/core/paths";
import { useIssueDraftStore } from "@multica/core/issues/stores/draft-store";
import { useCreateIssue, useUpdateIssue } from "@multica/core/issues/mutations";
import { useFileUpload } from "@multica/core/hooks/use-file-upload";
import { api } from "@multica/core/api";
import { FileUploadButton } from "@multica/ui/components/common/file-upload-button";

// ---------------------------------------------------------------------------
// Pill trigger — shared rounded-full button style for toolbar
// ---------------------------------------------------------------------------

function PillButton({
  children,
  className,
  ...props
}: React.ButtonHTMLAttributes<HTMLButtonElement>) {
  return (
    <button
      type="button"
      className={cn(
        "inline-flex items-center gap-1.5 rounded-full border px-2.5 py-1 text-xs",
        "hover:bg-accent/60 transition-colors cursor-pointer",
        className,
      )}
      {...props}
    >
      {children}
    </button>
  );
}

// ---------------------------------------------------------------------------
// CreateIssueModal
// ---------------------------------------------------------------------------

export function CreateIssueModal({ onClose, data }: { onClose: () => void; data?: Record<string, unknown> | null }) {
  const router = useNavigation();
  const p = useWorkspacePaths();
  const workspaceName = useCurrentWorkspace()?.name;

  const draft = useIssueDraftStore((s) => s.draft);
  const setDraft = useIssueDraftStore((s) => s.setDraft);
  const clearDraft = useIssueDraftStore((s) => s.clearDraft);

  const [title, setTitle] = useState(draft.title);
  const descEditorRef = useRef<ContentEditorRef>(null);
  const { isDragOver: descDragOver, dropZoneProps: descDropZoneProps } = useFileDropZone({
    onDrop: (files) => files.forEach((f) => descEditorRef.current?.uploadFile(f)),
  });
  const [status, setStatus] = useState<IssueStatus>((data?.status as IssueStatus) || draft.status);
  const [priority, setPriority] = useState<IssuePriority>(draft.priority);
  const [submitting, setSubmitting] = useState(false);
  const [assigneeType, setAssigneeType] = useState<IssueAssigneeType | undefined>(draft.assigneeType);
  const [assigneeId, setAssigneeId] = useState<string | undefined>(draft.assigneeId);
  const [dueDate, setDueDate] = useState<string | null>(draft.dueDate);
  const [projectId, setProjectId] = useState<string | undefined>(
    (data?.project_id as string) || undefined,
  );
  const [isExpanded, setIsExpanded] = useState(false);
  const [backlogHintIssueId, setBacklogHintIssueId] = useState<string | null>(null);

  // File upload — collect attachment IDs so we can link them after issue creation.
  const [attachmentIds, setAttachmentIds] = useState<string[]>([]);
  const { uploadWithToast } = useFileUpload(api);
  const handleUpload = async (file: File) => {
    const result = await uploadWithToast(file);
    if (result) {
      setAttachmentIds((prev) => [...prev, result.id]);
    }
    return result;
  };

  // Sync field changes to draft store
  const updateTitle = (v: string) => { setTitle(v); setDraft({ title: v }); };
  const updateStatus = (v: IssueStatus) => { setStatus(v); setDraft({ status: v }); };
  const updatePriority = (v: IssuePriority) => { setPriority(v); setDraft({ priority: v }); };
  const updateAssignee = (type?: IssueAssigneeType, id?: string) => {
    setAssigneeType(type); setAssigneeId(id);
    setDraft({ assigneeType: type, assigneeId: id });
  };
  const updateDueDate = (v: string | null) => { setDueDate(v); setDraft({ dueDate: v }); };

  const createIssueMutation = useCreateIssue();
  const updateIssueMutation = useUpdateIssue();
  const handleSubmit = async () => {
    if (!title.trim() || submitting) return;
    setSubmitting(true);
    try {
      const issue = await createIssueMutation.mutateAsync({
        title: title.trim(),
        description: descEditorRef.current?.getMarkdown()?.trim() || undefined,
        status,
        priority,
        assignee_type: assigneeType,
        assignee_id: assigneeId,
        due_date: dueDate || undefined,
        attachment_ids: attachmentIds.length > 0 ? attachmentIds : undefined,
        parent_issue_id: (data?.parent_issue_id as string) || undefined,
        project_id: projectId,
      });
      clearDraft();
      const shouldShowBacklogHint =
        status === "backlog" && assigneeType === "agent" && assigneeId &&
        localStorage.getItem("multica:backlog-agent-hint-dismissed") !== "true";

      if (shouldShowBacklogHint) {
        setBacklogHintIssueId(issue.id);
      } else {
        onClose();
      }

      if (!shouldShowBacklogHint) {
        toast.custom((t) => (
          <div className="bg-popover text-popover-foreground border rounded-lg shadow-lg p-4 w-[360px]">
            <div className="flex items-center gap-2 mb-2">
              <div className="flex items-center justify-center size-5 rounded-full bg-emerald-500/15 text-emerald-500">
                <Check className="size-3" />
              </div>
              <span className="text-sm font-medium">Issue created</span>
            </div>
            <div className="flex items-center gap-2 text-sm text-muted-foreground ml-7">
              <StatusIcon status={issue.status} className="size-3.5 shrink-0" />
              <span className="truncate">{issue.identifier} – {issue.title}</span>
            </div>
            <button
              type="button"
              className="ml-7 mt-2 text-sm text-primary hover:underline cursor-pointer"
              onClick={() => {
                router.push(p.issueDetail(issue.id));
                toast.dismiss(t);
              }}
            >
              View issue
            </button>
          </div>
        ), { duration: 5000 });
      }
    } catch {
      toast.error("Failed to create issue");
    } finally {
      setSubmitting(false);
    }
  };

  return (
    <Dialog
      open
      onOpenChange={(v) => {
        if (!v) {
          setBacklogHintIssueId(null);
          onClose();
        }
      }}
    >
      <DialogContent
        finalFocus={false}
        showCloseButton={false}
        className={cn(
          "p-0 gap-0 flex flex-col overflow-hidden",
          "!top-1/2 !left-1/2 !-translate-x-1/2",
          backlogHintIssueId
            ? "!max-w-[480px] !w-[calc(100vw-2rem)] !h-auto !-translate-y-1/2 !transition-none !duration-0"
            : "!transition-all !duration-300 !ease-out",
          !backlogHintIssueId && isExpanded
            ? "!max-w-4xl !w-full !h-5/6 !-translate-y-1/2"
            : !backlogHintIssueId
              ? "!max-w-2xl !w-full !h-96 !-translate-y-1/2"
              : "",
        )}
      >
        {backlogHintIssueId ? (
          <BacklogAgentHintContent
            onKeepInBacklog={() => {
              setBacklogHintIssueId(null);
              onClose();
            }}
            onDismissPermanently={() => {
              localStorage.setItem("multica:backlog-agent-hint-dismissed", "true");
            }}
            onMoveToTodo={() => {
              updateIssueMutation.mutate(
                { id: backlogHintIssueId, status: "todo" },
                { onError: () => toast.error("Failed to update status") },
              );
              setBacklogHintIssueId(null);
              onClose();
            }}
          />
        ) : (
          <>
            <DialogTitle className="sr-only">New Issue</DialogTitle>

            {/* Header */}
            <div className="flex items-center justify-between px-5 pt-3 pb-2 shrink-0">
              <div className="flex items-center gap-1.5 text-xs">
                <span className="text-muted-foreground">{workspaceName}</span>
                <ChevronRight className="size-3 text-muted-foreground/50" />
                {typeof data?.parent_issue_identifier === "string" && (
                  <>
                    <span className="text-muted-foreground">{data.parent_issue_identifier}</span>
                    <ChevronRight className="size-3 text-muted-foreground/50" />
                  </>
                )}
                <span className="font-medium">{data?.parent_issue_id ? "New sub-issue" : "New issue"}</span>
              </div>
              <div className="flex items-center gap-1">
                <Tooltip>
                  <TooltipTrigger
                    render={
                      <button
                        onClick={() => setIsExpanded(!isExpanded)}
                        className="rounded-sm p-1.5 opacity-70 hover:opacity-100 hover:bg-accent/60 transition-all cursor-pointer"
                      >
                        {isExpanded ? <Minimize2 className="size-4" /> : <Maximize2 className="size-4" />}
                      </button>
                    }
                  />
                  <TooltipContent side="bottom">{isExpanded ? "Collapse" : "Expand"}</TooltipContent>
                </Tooltip>
                <Tooltip>
                  <TooltipTrigger
                    render={
                      <button
                        onClick={onClose}
                        className="rounded-sm p-1.5 opacity-70 hover:opacity-100 hover:bg-accent/60 transition-all cursor-pointer"
                      >
                        <XIcon className="size-4" />
                      </button>
                    }
                  />
                  <TooltipContent side="bottom">Close</TooltipContent>
                </Tooltip>
              </div>
            </div>

            {/* Title */}
            <div className="px-5 pb-2 shrink-0">
              <TitleEditor
                autoFocus
                defaultValue={draft.title}
                placeholder="Issue title"
                className="text-lg font-semibold"
                onChange={(v) => updateTitle(v)}
                onSubmit={handleSubmit}
              />
            </div>

            {/* Description — takes remaining space */}
            <div {...descDropZoneProps} className="relative flex-1 min-h-0 overflow-y-auto px-5">
              <ContentEditor
                ref={descEditorRef}
                defaultValue={draft.description}
                placeholder="Add description..."
                onUpdate={(md) => setDraft({ description: md })}
                onUploadFile={handleUpload}
                debounceMs={500}
              />
              {descDragOver && <FileDropOverlay />}
            </div>

            {/* Property toolbar */}
            <div className="flex items-center gap-1.5 px-4 py-2 shrink-0 flex-wrap">
              {/* Status */}
              <StatusPicker
                status={status}
                onUpdate={(u) => { if (u.status) updateStatus(u.status); }}
                triggerRender={<PillButton />}
                align="start"
              />

              {/* Priority */}
              <PriorityPicker
                priority={priority}
                onUpdate={(u) => { if (u.priority) updatePriority(u.priority); }}
                triggerRender={<PillButton />}
                align="start"
              />

              {/* Assignee */}
              <AssigneePicker
                assigneeType={assigneeType ?? null}
                assigneeId={assigneeId ?? null}
                onUpdate={(u) => updateAssignee(
                  u.assignee_type ?? undefined,
                  u.assignee_id ?? undefined,
                )}
                triggerRender={<PillButton />}
                align="start"
              />

              {/* Due date */}
              <DueDatePicker
                dueDate={dueDate}
                onUpdate={(u) => updateDueDate(u.due_date ?? null)}
                triggerRender={<PillButton />}
                align="start"
              />

              {/* Project */}
              <ProjectPicker
                projectId={projectId ?? null}
                onUpdate={(u) => setProjectId(u.project_id ?? undefined)}
                triggerRender={<PillButton />}
                align="start"
              />
            </div>

            {/* Footer */}
            <div className="flex items-center justify-between px-4 py-3 border-t shrink-0">
              <FileUploadButton
                onSelect={(file) => descEditorRef.current?.uploadFile(file)}
              />
              <Button size="sm" onClick={handleSubmit} disabled={!title.trim() || submitting}>
                {submitting ? "Creating..." : "Create Issue"}
              </Button>
            </div>
          </>
        )}
      </DialogContent>
    </Dialog>
  );
}