import { useEffect, useState } from "react";
import {
  Button,
  Dropdown,
  Input,
  Modal,
  Tabs,
  Toast,
} from "@douyinfe/semi-ui-19";
import {
  IconCopy,
  IconDelete,
  IconEdit,
  IconMore,
  IconPlus,
  IconSave,
  IconList,
} from "@douyinfe/semi-icons";
import { api, ApiError, post } from "../api";
import type { Submission } from "../types";

export type ViewContent = {
  name: string;
  filters: Record<string, unknown>;
  columns: string[];
};
type View = { id: string; version: number; content: ViewContent };
type Editor = {
  mode: "create" | "rename" | "copy";
  content: ViewContent;
  view?: View;
};

// The API normalizes numbers and adds offset; neither changes the saved view.
function filterSignature(filters: Record<string, unknown>) {
  return JSON.stringify(
    Object.entries(filters)
      .filter(
        ([key, value]) => key !== "offset" && value !== "" && value != null,
      )
      .map(([key, value]) => [key, String(value)])
      .sort(([a], [b]) => a.localeCompare(b)),
  );
}

export function SavedViews({
  filters,
  columns,
  submission,
  submissionBlocked,
  selectedId,
  onSelect,
  onSubmissionChange,
  onRestore,
  suspended,
  onOverlay,
}: {
  filters: Record<string, unknown>;
  columns: string[];
  submission: Submission;
  submissionBlocked: boolean;
  selectedId: string | null;
  onSelect: (id: string | null) => void;
  onSubmissionChange: (submission: string) => void;
  onRestore: (view: ViewContent) => void;
  suspended: boolean;
  onOverlay: () => void;
}) {
  const [items, setItems] = useState<View[]>([]);
  const [editor, setEditor] = useState<Editor | null>(null);
  const [deleting, setDeleting] = useState<View | null>(null);
  const [name, setName] = useState("");
  const [busy, setBusy] = useState(false);
  const [revision, setRevision] = useState(0);
  const current = items.find((item) => item.id === selectedId);
  const modified =
    current &&
    (filterSignature(filters) !== filterSignature(current.content.filters) ||
      JSON.stringify(columns) !== JSON.stringify(current.content.columns));
  useEffect(() => {
    const controller = new AbortController();
    async function load() {
      const views: View[] = [];
      // Tabs replace remote search, so retain access to views beyond the first page.
      while (!controller.signal.aborted) {
        const result = await api<{ items: View[]; total: number }>(
          `/research/assets?kind=view&limit=100&offset=${views.length}`,
          { signal: controller.signal },
        );
        views.push(...result.items);
        if (views.length >= result.total || result.items.length === 0) break;
      }
      if (!controller.signal.aborted) setItems(views);
    }
    void load().catch((error: Error) => {
      if (!controller.signal.aborted) Toast.error(error.message);
    });
    return () => controller.abort();
  }, [revision]);

  function openEditor(mode: Editor["mode"], view?: View) {
    const content = view?.content ?? { name: "", filters, columns };
    setEditor({ mode, content, view });
    setName(
      mode === "copy" ? `${content.name} 副本`.slice(0, 200) : content.name,
    );
    onOverlay();
  }
  function reportError(error: unknown) {
    Toast.error((error as Error).message);
    if (error instanceof ApiError && error.status === 409) {
      setRevision((value) => value + 1);
      setEditor(null);
      setDeleting(null);
    }
  }
  async function save(content: ViewContent, old?: View, restore = false) {
    setBusy(true);
    try {
      const value = old
        ? await api<View>(`/research/assets/${old.id}`, {
            method: "PUT",
            body: JSON.stringify({
              kind: "view",
              version: old.version,
              content,
            }),
          })
        : await post<View>("/research/assets", { kind: "view", content });
      setItems((previous) =>
        old
          ? previous.map((item) => (item.id === value.id ? value : item))
          : [...previous, value],
      );
      if (restore) {
        onSelect(value.id);
        onRestore(value.content);
      }
      setEditor(null);
      Toast.success("筛选视图已保存");
    } catch (error) {
      reportError(error);
    } finally {
      setBusy(false);
    }
  }
  async function remove() {
    if (!deleting) return;
    setBusy(true);
    try {
      await api(`/research/assets/${deleting.id}?version=${deleting.version}`, {
        method: "DELETE",
      });
      setItems((previous) =>
        previous.filter((item) => item.id !== deleting.id),
      );
      if (selectedId === deleting.id)
        onSubmissionChange(
          submissionBlocked ? "SUBMISSION_BLOCKED" : submission,
        );
      setDeleting(null);
      Toast.success("视图已删除");
    } catch (error) {
      reportError(error);
    } finally {
      setBusy(false);
    }
  }
  return (
    <>
      <div className="alpha-views-header">
        <Tabs
          className="alpha-view-tabs"
          type="card"
          collapsible="auto"
          tabPaneMotion={false}
          activeKey={
            selectedId ??
            (submissionBlocked ? "SUBMISSION_BLOCKED" : submission)
          }
          onChange={(key) => {
            const view = items.find((item) => item.id === key);
            if (view) {
              onSelect(view.id);
              onRestore(view.content);
            } else onSubmissionChange(key);
          }}
          tabList={[
            {
              itemKey: "UNSUBMITTED",
              tab: "待提交",
              icon: <IconList aria-hidden="true" />,
            },
            {
              itemKey: "SUBMITTED",
              tab: "已提交",
              icon: <IconList aria-hidden="true" />,
            },
            {
              itemKey: "SUBMISSION_BLOCKED",
              tab: "提交受阻",
              icon: <IconList aria-hidden="true" />,
            },
            ...items.map((view) => ({
              itemKey: view.id,
              icon: <IconList aria-hidden="true" />,
              tab: (
                <span className="alpha-view-label">
                  <span className="alpha-view-name" title={view.content.name}>
                    {view.content.name}
                  </span>
                  {view.id === selectedId && modified && (
                    <span
                      className="alpha-view-modified"
                      title="视图有未保存的更改"
                      aria-label="有未保存的更改"
                    />
                  )}
                  <span
                    onClick={(event) => event.stopPropagation()}
                    onKeyDown={(event) => event.stopPropagation()}
                  >
                    <Dropdown
                      trigger="click"
                      position="bottomLeft"
                      stopPropagation
                      render={
                        <Dropdown.Menu>
                          <Dropdown.Item
                            icon={<IconSave aria-hidden="true" />}
                            disabled={
                              busy || view.id !== selectedId || !modified
                            }
                            onClick={() =>
                              void save(
                                { name: view.content.name, filters, columns },
                                view,
                              )
                            }
                          >
                            更新当前视图
                          </Dropdown.Item>
                          <Dropdown.Item
                            icon={<IconEdit aria-hidden="true" />}
                            disabled={busy}
                            onClick={() => openEditor("rename", view)}
                          >
                            重命名
                          </Dropdown.Item>
                          <Dropdown.Item
                            icon={<IconCopy aria-hidden="true" />}
                            disabled={busy}
                            onClick={() => openEditor("copy", view)}
                          >
                            复制视图
                          </Dropdown.Item>
                          <Dropdown.Divider />
                          <Dropdown.Item
                            icon={<IconDelete aria-hidden="true" />}
                            type="danger"
                            disabled={busy}
                            onClick={() => {
                              setDeleting(view);
                              onOverlay();
                            }}
                          >
                            删除视图
                          </Dropdown.Item>
                        </Dropdown.Menu>
                      }
                    >
                      <Button
                        icon={<IconMore aria-hidden="true" />}
                        size="small"
                        theme="borderless"
                        type="tertiary"
                        aria-label={`${view.content.name} 视图操作`}
                      />
                    </Dropdown>
                  </span>
                </span>
              ),
            })),
          ]}
        />
        <Button
          className="alpha-add-view"
          icon={<IconPlus aria-hidden="true" />}
          theme="borderless"
          type="tertiary"
          disabled={busy}
          aria-label="保存为新视图"
          title="将当前筛选、排序和显示列保存为新视图"
          onClick={() => openEditor("create")}
        >
          新建视图
        </Button>
      </div>
      <Modal
        title={
          editor?.mode === "rename"
            ? "重命名视图"
            : editor?.mode === "copy"
              ? "复制视图"
              : "保存为新视图"
        }
        visible={Boolean(editor) && !suspended}
        onCancel={() => {
          if (!busy) setEditor(null);
        }}
        confirmLoading={busy}
        okText="保存视图"
        okButtonProps={{ disabled: !name.trim(), "aria-label": "保存视图" }}
        onOk={() => {
          if (editor && name.trim())
            void save(
              { ...editor.content, name: name.trim() },
              editor.mode === "rename" ? editor.view : undefined,
              editor.mode !== "rename",
            );
        }}
      >
        <label>
          视图名称
          <Input
            aria-label="视图名称"
            placeholder="例如：低换手候选"
            value={name}
            onChange={setName}
            maxLength={200}
            autoFocus
          />
        </label>
        {editor?.mode !== "rename" && (
          <p className="muted">
            保存筛选条件、排序、每页条数和显示列，之后可从标签栏一键切换。
          </p>
        )}
      </Modal>
      <Modal
        title="删除视图"
        visible={Boolean(deleting) && !suspended}
        onCancel={() => {
          if (!busy) setDeleting(null);
        }}
        confirmLoading={busy}
        okText="删除视图"
        okButtonProps={{ type: "danger", "aria-label": "删除视图" }}
        onOk={() => void remove()}
      >
        <p>
          删除“{deleting?.content.name}”后，该视图将从标签栏移除，Alpha
          数据不受影响。
        </p>
      </Modal>
    </>
  );
}