// ---- pythonEditorSlice ----
//
// 拥有 pythonEditorBuffers (per-scriptId 临时编辑缓冲)。
// Actions: openPythonEditor / setPythonEditorContent / savePythonEditor /
// exitPythonEditor / exitAllPythonEditors。
// 模块级 _pythonEditorOpeningIds (去重 in-flight open) 通过 helpers 访问。

import type { StateCreator } from "zustand";
import type { ScriptItem } from "~/services/api";

import {
  getPythonEditorOpeningIds,
  pushToast,
  requireApi,
} from "./helpers";

import type {
  PythonEditorSliceActions,
  PythonEditorSliceState,
} from "./types";
import type { ScriptWorkspaceStore } from "./useScriptWorkspaceStore";

export const createPythonEditorSlice: StateCreator<
  ScriptWorkspaceStore,
  [],
  [],
  PythonEditorSliceState & PythonEditorSliceActions
> = (set, get) => {
  const initial: PythonEditorSliceState = {
    pythonEditorBuffers: {},
  };

  return {
    ...initial,

    openPythonEditor: async (script: ScriptItem, showToast = true) => {
      if (!script) return;
      const opening = getPythonEditorOpeningIds();
      if (opening.has(script.script_id)) return;
      opening.add(script.script_id);
      try {
        const workspaceId = script.workspace_id;
        const url =
          `/jupyter/${workspaceId}/api/contents/${script.jupyter_path}` +
          `?type=file&content=1&hash=1&format=text`;
        const response = await fetch(url, {
          credentials: "include",
          cache: "no-store",
        });
        if (!response.ok) {
          throw new Error(`加载文件失败: ${response.status}`);
        }
        const data = await response.json();
        const content = typeof data.content === "string" ? data.content : "";
        set((state) => ({
          pythonEditorBuffers: {
            ...state.pythonEditorBuffers,
            [script.script_id]: {
              initialContent: content,
              content,
              dirty: false,
              saving: false,
              initial: true,
              loadError: null,
            },
          },
        }));
      } catch (error) {
        const message =
          error instanceof Error ? error.message : "打开 Python 编辑器失败";
        set((state) => ({
          pythonEditorBuffers: {
            ...state.pythonEditorBuffers,
            [script.script_id]: {
              initialContent: null,
              content: null,
              dirty: false,
              saving: false,
              initial: false,
              loadError: message,
            },
          },
        }));
        if (showToast) {
          pushToast("error", message);
        }
      } finally {
        opening.delete(script.script_id);
      }
    },

    setPythonEditorContent: (scriptId, value) => {
      set((state) => {
        const buffer = state.pythonEditorBuffers[scriptId];
        if (!buffer) return state;
        return {
          pythonEditorBuffers: {
            ...state.pythonEditorBuffers,
            [scriptId]: {
              ...buffer,
              content: value,
              dirty: value !== buffer.initialContent,
            },
          },
        };
      });
    },

    savePythonEditor: async (scriptId) => {
      const buffer = get().pythonEditorBuffers[scriptId];
      if (!buffer || buffer.content === null || !buffer.dirty || buffer.saving) {
        return;
      }
      const script = get().scripts.find((s) => s.script_id === scriptId);
      if (!script) return;
      const savedContent = buffer.content;
      set((state) => ({
        pythonEditorBuffers: {
          ...state.pythonEditorBuffers,
          [scriptId]: { ...buffer, saving: true },
        },
      }));
      try {
        const api = requireApi();
        await api.updateScript(scriptId, { content: savedContent });
        set((state) => {
          const current = state.pythonEditorBuffers[scriptId];
          if (!current) return state;
          return {
            pythonEditorBuffers: {
              ...state.pythonEditorBuffers,
              [scriptId]: {
                ...current,
                initialContent: savedContent,
                dirty: current.content !== savedContent,
                saving: false,
                initial: false,
              },
            },
          };
        });
        pushToast("success", "已保存");
      } catch (error) {
        set((state) => {
          const current = state.pythonEditorBuffers[scriptId];
          if (!current) return state;
          return {
            pythonEditorBuffers: {
              ...state.pythonEditorBuffers,
              [scriptId]: { ...current, saving: false },
            },
          };
        });
        pushToast(
          "error",
          error instanceof Error ? error.message : "保存失败",
        );
      }
    },

    exitPythonEditor: (scriptId) => {
      set((state) => {
        const next = { ...state.pythonEditorBuffers };
        delete next[scriptId];
        return { pythonEditorBuffers: next };
      });
    },

    exitAllPythonEditors: () => {
      const opening = getPythonEditorOpeningIds();
      opening.clear();
      set({ pythonEditorBuffers: {} });
    },
  };
};