import { useCallback, useMemo, useState } from "react";

import { Plus, Search } from "lucide-react";
import { ApiRequestError, type Workspace, type WorkspaceMember } from "../../services/api";
import { useApi, useAuth } from "../../context/AuthContext";
import { Button } from "~/components/ui/button";
import { ConfirmDialog } from "~/components/common/ConfirmDialog";
import {
  Table,
  TableBody,
  TableCell,
  TableHead,
  TableHeader,
  TableRow,
} from "~/components/ui/table";
import { AdminColgroup, USER_PROJECT_COL_WIDTHS } from "./AdminTable";
import { AdminPagination } from "./AdminPagination";
import { ProjectEditDialog } from "./ProjectEditDialog";
import { ProjectMembersDrawer } from "./ProjectMembersDrawer";
import { useCursorPage } from "./useCursorPage";
import { useDebouncedValue } from "./useDebouncedValue";
import {
  adminEmptyClass,
  adminPageClass,
  adminReadonlyClass,
  adminToolbarClass,
  adminToolbarInputClass,
  adminToolbarSearchClass,
  employeeActionsClass,
  employeeAvatarClass,
  employeeNameClass,
  rowButtonClass,
  rowDangerButtonClass,
  statusPillClass,
} from "./adminUi";

import { primaryGradientButtonClass } from "~/components/common/buttonClasses";

const EMPTY_PROJECT_FORM = {
  workspace_code: "",
  workspace_name: "",
  quota_bytes: 0,
  description: "",
};

export function ProjectManagementPage({
  onNotify,
  onConnectionChange,
}: {
  onNotify: (notice: { tone: "success" | "error" | "info"; message: string }) => void;
  onConnectionChange: (online: boolean) => void;
}) {
  const api = useApi();
  const { user, refreshWorkspaces } = useAuth();
  const [projectDialogOpen, setProjectDialogOpen] = useState(false);
  const [projectForm, setProjectForm] = useState(EMPTY_PROJECT_FORM);
  const [editingProject, setEditingProject] = useState<Workspace | null>(null);
  const [selectedProject, setSelectedProject] = useState<Workspace | null>(null);
  const [projectSearchTerm, setProjectSearchTerm] = useState("");
  const [saving, setSaving] = useState(false);
  const [membersDrawerOpen, setMembersDrawerOpen] = useState(false);
  const [currentProjectMembers, setCurrentProjectMembers] = useState<WorkspaceMember[]>([]);
  const [membersLoading, setMembersLoading] = useState(false);
  const [deleteTarget, setDeleteTarget] = useState<Workspace | null>(null);
  const [removeMemberTarget, setRemoveMemberTarget] = useState<WorkspaceMember | null>(null);
  const debouncedSearch = useDebouncedValue(projectSearchTerm, 300);

  const canManage = user?.role_code === "admin";

  const fetchProjects = useCallback(
    async (input: { limit: number; cursor: string | null; q: string }) => {
      try {
        const page = await api.listWorkspaces(input);
        onConnectionChange(true);
        return page;
      } catch (error) {
        onConnectionChange(false);
        onNotify({
          tone: "error",
          message: error instanceof Error ? error.message : "项目列表加载失败",
        });
        throw error;
      }
    },
    [api, onConnectionChange, onNotify],
  );

  const {
    items: projects,
    setItems: setProjects,
    page,
    loading: projectLoading,
    meta,
    totalPages,
    goNext,
    goPrev,
    goToPage,
    canGoToPage,
    reload,
    refreshFromStart,
  } = useCursorPage(fetchProjects, debouncedSearch);

  const openCreateProject = (): void => {
    setEditingProject(null);
    setProjectForm(EMPTY_PROJECT_FORM);
    setProjectDialogOpen(true);
  };

  const openEditProject = (project: Workspace): void => {
    setEditingProject(project);
    setProjectForm({
      workspace_code: project.workspace_code,
      workspace_name: project.workspace_name,
      quota_bytes: project.quota_bytes,
      description: project.description ?? "",
    });
    setProjectDialogOpen(true);
  };

  const submitProject = async (event: React.FormEvent): Promise<void> => {
    event.preventDefault();
    if (!projectForm.workspace_name.trim()) {
      onNotify({ tone: "error", message: "请输入项目名称" });
      return;
    }
    if (!projectForm.workspace_code.trim() && !editingProject) {
      onNotify({ tone: "error", message: "请输入项目编码" });
      return;
    }
    setSaving(true);
    try {
      if (editingProject) {
        const updated = await api.updateWorkspace(editingProject.workspace_id, {
          workspace_name: projectForm.workspace_name.trim(),
          quota_bytes: projectForm.quota_bytes,
          description: projectForm.description.trim() || undefined,
        });
        setProjects((current) =>
          current.map((p) => (p.workspace_id === updated.workspace_id ? updated : p)),
        );
        onNotify({ tone: "success", message: "项目信息已更新" });
      } else {
        const generatedCode =
          projectForm.workspace_code.trim() ||
          projectForm.workspace_name
            .trim()
            .toLowerCase()
            .replace(/[^a-z0-9-]/g, "-")
            .slice(0, 32);
        await api.createWorkspace({
          workspace_code: generatedCode,
          workspace_name: projectForm.workspace_name.trim(),
          quota_bytes: projectForm.quota_bytes,
          description: projectForm.description.trim() || undefined,
        });
        void refreshWorkspaces();
        onNotify({ tone: "success", message: "项目已创建" });
        await refreshFromStart();
      }
      setProjectDialogOpen(false);
    } catch (error) {
      onNotify({
        tone: "error",
        message: error instanceof ApiRequestError
          ? error.message
          : editingProject
            ? "更新项目失败"
            : "创建项目失败",
      });
    } finally {
      setSaving(false);
    }
  };

  const executeDeleteProject = async (project: Workspace): Promise<void> => {
    try {
      await api.deleteWorkspace(project.workspace_id);
      onNotify({ tone: "success", message: "项目已删除" });
      if (projects.length <= 1 && page > 1) {
        goPrev();
      } else {
        reload();
      }
    } catch (error) {
      onNotify({
        tone: "error",
        message: error instanceof Error ? error.message : "删除项目失败",
      });
    }
  };

  const loadImportUsers = useCallback(
    async (input: { q: string; cursor: string | null; limit: number }) => {
      const page = await api.listPlatformEmployees({
        limit: input.limit,
        cursor: input.cursor,
        q: input.q,
      });
      return {
        items: page.items,
        hasMore: page.meta.has_more,
        nextCursor: page.meta.next_cursor,
      };
    },
    [api],
  );

  const openMembersDrawer = (project: Workspace): void => {
    setSelectedProject(project);
    setMembersDrawerOpen(true);
    void loadProjectMembers(project.workspace_id);
  };

  const loadProjectMembers = async (workspaceId: string): Promise<void> => {
    setMembersLoading(true);
    try {
      const members = await api.listWorkspaceMembers(workspaceId);
      setCurrentProjectMembers(members);
    } catch (error) {
      onNotify({
        tone: "error",
        message: error instanceof Error ? error.message : "成员列表加载失败",
      });
    } finally {
      setMembersLoading(false);
    }
  };

  const requestRemoveMember = (userId: string): void => {
    const targetMember = currentProjectMembers.find((m) => m.user_id === userId);
    if (!targetMember) return;
    if (targetMember.role_code === "admin") {
      onNotify({ tone: "error", message: "管理员不能被移除" });
      return;
    }
    setRemoveMemberTarget(targetMember);
  };

  const executeRemoveMember = async (member: WorkspaceMember): Promise<void> => {
    if (!selectedProject) return;
    try {
      await api.deleteWorkspaceMember(selectedProject.workspace_id, member.user_id);
      setCurrentProjectMembers((current) =>
        current.filter((m) => m.user_id !== member.user_id),
      );
      onNotify({ tone: "success", message: "成员已移除" });
    } catch (error) {
      onNotify({
        tone: "error",
        message: error instanceof ApiRequestError ? error.message : "移除成员失败",
      });
    }
  };

  const importMembers = async (userIds: string[]): Promise<void> => {
    if (!selectedProject || userIds.length === 0) {
      onNotify({ tone: "error", message: "请选择要添加的用户" });
      return;
    }
    setSaving(true);
    try {
      await Promise.all(
        userIds.map((userId) =>
          api.addWorkspaceMember(selectedProject.workspace_id, {
            user_id: userId,
          }),
        ),
      );
      onNotify({ tone: "success", message: `已添加 ${userIds.length} 名成员` });
      await loadProjectMembers(selectedProject.workspace_id);
    } catch (error) {
      onNotify({
        tone: "error",
        message: error instanceof ApiRequestError ? error.message : "添加成员失败",
      });
      throw error;
    } finally {
      setSaving(false);
    }
  };

  const emptyMessage = useMemo(() => {
    if (projectLoading) return "正在加载项目…";
    if (debouncedSearch.trim()) return "未找到匹配的项目";
    return "暂无项目";
  }, [projectLoading, debouncedSearch]);

  return (
    <section className={adminPageClass}>
      <div className={adminToolbarClass}>
        <div className={adminToolbarSearchClass}>
          <Search size={14} />
          <input
            type="text"
            placeholder="请输入项目名称"
            className={adminToolbarInputClass}
            value={projectSearchTerm}
            onChange={(event) => setProjectSearchTerm(event.target.value)}
          />
        </div>
        <Button
          variant="default"
          size="sm"
          type="button"
          disabled={!canManage}
          onClick={openCreateProject}
          className={primaryGradientButtonClass}
        >
          <Plus size={15} />
          新建项目
        </Button>
      </div>

      {!canManage && <div className={adminReadonlyClass}>当前为开发人员，只能查看项目列表。</div>}
      <Table className="rounded-[9px] border border-line overflow-hidden text-[11px] text-[#44576a] [--border-color:var(--color-line)] table-fixed bg-white">
        <AdminColgroup widths={USER_PROJECT_COL_WIDTHS} />
        <TableHeader className="bg-[#f5f8fb] text-ink-caption">
          <TableRow className="hover:bg-transparent border-b border-[#edf1f5]">
            <TableHead className="h-10 px-4 text-[10px] font-bold text-ink-caption">项目名称</TableHead>
            <TableHead className="h-10 px-4 text-[10px] font-bold text-ink-caption">项目编码</TableHead>
            <TableHead className="h-10 px-4 text-[10px] font-bold text-ink-caption">状态</TableHead>
            <TableHead className="h-10 px-4 text-[10px] font-bold text-ink-caption">配额</TableHead>
            <TableHead className="h-10 px-4 text-[10px] font-bold text-ink-caption">操作</TableHead>
          </TableRow>
        </TableHeader>
        <TableBody>
          {projectLoading || projects.length === 0 ? (
            <TableRow className="min-h-[64px] border-t border-[#edf1f5] hover:bg-transparent data-[state=selected]:bg-transparent">
              <TableCell colSpan={5} className="p-0">
                <p className={adminEmptyClass}>{emptyMessage}</p>
              </TableCell>
            </TableRow>
          ) : (
            projects.map((project) => (
              <TableRow key={project.workspace_id} className="min-h-[64px] border-t border-[#edf1f5] hover:bg-[#f7fafc] data-[state=selected]:bg-transparent">
                <TableCell className="p-3 px-4 align-middle">
                  <span className={employeeNameClass}>
                    <b className={employeeAvatarClass}>{project.workspace_name.slice(0, 1)}</b>
                    <span>
                      <strong>{project.workspace_name}</strong>
                      <small>{project.description ?? "无描述"}</small>
                    </span>
                  </span>
                </TableCell>
                <TableCell className="p-3 px-4 align-middle"><code>{project.workspace_code}</code></TableCell>
                <TableCell className="p-3 px-4 align-middle">
                  <span className={statusPillClass(project.status)}>
                    {project.status === "active" ? "正常" : project.status === "archived" ? "已归档" : "已删除"}
                  </span>
                </TableCell>
                <TableCell className="p-3 px-4 align-middle">
                  <span>
                    {project.quota_bytes > 0
                      ? `${(project.quota_bytes / 1024 / 1024 / 1024).toFixed(1)} GB`
                      : "无限制"}
                  </span>
                </TableCell>
                <TableCell className="p-3 px-4 align-middle">
                  <span className={employeeActionsClass}>
                    <Button
                      variant="outline"
                      size="xs"
                      type="button"
                      disabled={!canManage}
                      onClick={() => openMembersDrawer(project)}
                      className={rowButtonClass}
                    >
                      成员
                    </Button>
                    <Button
                      variant="outline"
                      size="xs"
                      type="button"
                      disabled={!canManage}
                      onClick={() => openEditProject(project)}
                      className={rowButtonClass}
                    >
                      编辑
                    </Button>
                    <Button
                      variant="destructive"
                      size="xs"
                      type="button"
                      disabled={!canManage || project.status === "disabled"}
                      title={project.status === "disabled" ? "已删除的项目不能操作" : "删除项目"}
                      onClick={() => setDeleteTarget(project)}
                      className={rowDangerButtonClass}
                    >
                      删除
                    </Button>
                  </span>
                </TableCell>
              </TableRow>
            ))
          )}
        </TableBody>
      </Table>

      <AdminPagination
        page={page}
        totalPages={totalPages}
        totalCount={meta.total_count}
        loading={projectLoading}
        hasMore={meta.has_more}
        canGoToPage={canGoToPage}
        onPrev={goPrev}
        onNext={goNext}
        onGoToPage={goToPage}
      />

      <ProjectEditDialog
        open={projectDialogOpen}
        editingProject={editingProject}
        projectForm={projectForm}
        saving={saving}
        onNotify={onNotify}
        onChangeForm={setProjectForm}
        onSubmit={(event) => void submitProject(event)}
        onClose={() => setProjectDialogOpen(false)}
      />

      <ProjectMembersDrawer
        open={membersDrawerOpen}
        selectedProject={selectedProject}
        members={currentProjectMembers}
        membersLoading={membersLoading}
        canManage={canManage}
        saving={saving}
        onClose={() => {
          setMembersDrawerOpen(false);
          setRemoveMemberTarget(null);
        }}
        onRemoveMember={requestRemoveMember}
        onAddMembers={importMembers}
        loadUsers={loadImportUsers}
      />

      <ConfirmDialog
        open={deleteTarget !== null}
        onOpenChange={(nextOpen) => {
          if (!nextOpen) setDeleteTarget(null);
        }}
        title="确定删除项目？"
        description={
          deleteTarget
            ? `确定要删除项目"${deleteTarget.workspace_name}"吗？此操作将级联软删所有成员。`
            : ""
        }
        confirmLabel="删除"
        destructive
        onConfirm={async () => {
          if (!deleteTarget) return;
          await executeDeleteProject(deleteTarget);
          setDeleteTarget(null);
        }}
      />

      <ConfirmDialog
        open={removeMemberTarget !== null}
        onOpenChange={(nextOpen) => {
          if (!nextOpen) setRemoveMemberTarget(null);
        }}
        title="确定移除成员？"
        description={
          removeMemberTarget
            ? `确定将"${removeMemberTarget.display_name}"从项目中移除吗？`
            : ""
        }
        confirmLabel="移除"
        destructive
        onConfirm={async () => {
          if (!removeMemberTarget) return;
          await executeRemoveMember(removeMemberTarget);
          setRemoveMemberTarget(null);
        }}
      />
    </section>
  );
}