import {
  apiRequest,
  ApiRequestError,
  createUuid,
  type ApiErrorEnvelope,
} from "./_shared";

export type ScriptType = "python" | "notebook";
export type Visibility = "private" | "workspace" | "public";

export type ScriptItem = {
  script_id: string;
  workspace_id: string;
  current_object_id: string;
  owner_user_id: string;
  owner_display_name: string | null;
  script_name: string;
  script_type: ScriptType;
  visibility: Visibility;
  status: string;
  is_locked: boolean;
  relative_path: string;
  jupyter_path: string;
  content_hash: string;
  size_bytes: number;
  created_at: string;
  updated_at: string;
};

export async function listScripts(
  workspaceId: string,
  parentPath: string = "",
  ownerUserId?: string,
): Promise<ScriptItem[]> {
  // Default (no ownerUserId) scopes to the requester's own subtree; passing
  // ownerUserId scopes to that owner's subtree (workspace/public only — the
  // backend excludes their private) so the tree can lazily fetch another
  // member's content when their group is expanded.
  const parameters = new URLSearchParams();
  if (parentPath) parameters.set("parent_path", parentPath);
  if (ownerUserId) parameters.set("owner_user_id", ownerUserId);
  const query = parameters.toString();
  return apiRequest<ScriptItem[]>(
    `/api/v1/scripts${query ? `?${query}` : ""}`,
    {},
    workspaceId,
  );
}

export async function countScripts(
  workspaceId: string,
): Promise<number> {
  // Backend route /api/v1/scripts/count must be declared BEFORE the
  // /scripts/{script_id} route on the server side. Returns
  // { data: { total: number } } — the dashboard's single source of
  // truth for "total active scripts in workspace", independent of the
  // lazy-loaded scripts[] in the workspace store.
  const envelope = await apiRequest<{ total: number }>(
    "/api/v1/scripts/count",
    {},
    workspaceId,
  );
  return envelope.total;
}

function initialContent(scriptType: ScriptType): string {
  if (scriptType === "python") {
    return [
      '"""模型实验开发平台构建脚本。"""',
      "",
      "",
      "def main() -> None:",
      '    print("Hello, Model Platform!")',
      "",
      "",
      'if __name__ == "__main__":',
      "    main()",
      "",
    ].join("\n");
  }

  return JSON.stringify(
    {
      cells: [
        {
          id: "intro",
          cell_type: "code",
          execution_count: null,
          metadata: {},
          outputs: [],
          source: ["print('Hello, Model Platform!')\n"],
        },
      ],
      metadata: {
        kernelspec: {
          display_name: "Python 3",
          language: "python",
          name: "python3",
        },
        language_info: {
          name: "python",
          version: "3.12",
        },
      },
      nbformat: 4,
      nbformat_minor: 5,
    },
    null,
    2,
  );
}

export async function createScript(
  workspaceId: string,
  input: {
    name: string;
    scriptType: ScriptType;
    visibility: Visibility;
    parentPath?: string | null;
  },
): Promise<ScriptItem> {
  return apiRequest<ScriptItem>(
    "/api/v1/scripts",
    {
      method: "POST",
      body: JSON.stringify({
        script_name: input.name.trim(),
        script_type: input.scriptType,
        visibility: input.visibility,
        content: initialContent(input.scriptType),
        parent_path: input.parentPath,
      }),
    },
    workspaceId,
  );
}

export async function uploadScript(
  workspaceId: string,
  file: File,
  parentPath = "",
  visibility: Visibility = "workspace",
): Promise<ScriptItem> {
  const parameters = new URLSearchParams({
    file_name: file.name,
    parent_path: parentPath,
    visibility,
  });
  return apiRequest<ScriptItem>(
    `/api/v1/scripts/upload?${parameters.toString()}`,
    {
      method: "POST",
      headers: { "Content-Type": "application/octet-stream" },
      body: file,
    },
    workspaceId,
  );
}

export async function setScriptLock(
  workspaceId: string,
  scriptId: string,
  isLocked: boolean,
): Promise<ScriptItem> {
  return apiRequest<ScriptItem>(
    `/api/v1/scripts/${encodeURIComponent(scriptId)}/lock`,
    {
      method: "PATCH",
      body: JSON.stringify({ is_locked: isLocked }),
    },
    workspaceId,
  );
}

export async function updateScript(
  workspaceId: string,
  scriptId: string,
  input: { content: string },
): Promise<ScriptItem> {
  return apiRequest<ScriptItem>(
    `/api/v1/scripts/${scriptId}`,
    { method: "PUT", body: JSON.stringify(input) },
    workspaceId,
  );
}

export async function getScriptContent(
  workspaceId: string,
  scriptId: string,
): Promise<{
  script_id: string;
  script_type: ScriptType;
  content: string | object;
  format: string;
}> {
  const response = await fetch(
    `/api/v1/scripts/${scriptId}/content?workspace_id=${encodeURIComponent(workspaceId)}`,
    {
      credentials: "same-origin",
      headers: {
        "X-Request-ID": createUuid().replaceAll("-", ""),
      },
    },
  );

  if (response.status === 401 && typeof window !== "undefined") {
    const here = window.location.pathname;
    if (here !== "/login") {
      window.location.assign("/login");
    }
    throw new ApiRequestError("未登录或登录已过期", 401);
  }

  const payload = await response.json();
  if (!response.ok) {
    const error = payload as ApiErrorEnvelope;
    const detailMessage = typeof error.detail === "string"
      ? error.detail
      : error.detail?.message;
    throw new ApiRequestError(
      detailMessage ?? `请求失败（HTTP ${response.status}）`,
      response.status,
    );
  }

  const data = (payload as { data: { script_id: string; script_type: ScriptType; content: string | object; format: string } }).data;
  if (!data || !data.script_type) {
    throw new ApiRequestError("响应数据格式错误", response.status);
  }
  return data;
}

export async function deleteScript(
  workspaceId: string,
  scriptId: string,
): Promise<{ script_id: string; status: string; versions_preserved: boolean }> {
  return apiRequest(
    `/api/v1/scripts/${scriptId}`,
    { method: "DELETE" },
    workspaceId,
  );
}

export type StableVersion = {
  versions_id: string;
  workspace_id: string;
  script_id: string;
  source_object_id: string;
  artifact_object_id: string;
  version_no: number;
  version_label: string;
  source_path: string;
  artifact_path: string;
  content_hash: string;
  file_size_bytes: number;
  visibility: Visibility;
  release_note: string | null;
  created_by: string;
  created_at: string;
};

export type LatestVersion = {
  versions_id: string;
  version_label: string;
};

export async function getLatestScriptVersion(
  workspaceId: string,
  scriptId: string,
): Promise<LatestVersion | null> {
  return apiRequest<LatestVersion | null>(
    `/api/v1/scripts/${scriptId}/latest-version`,
    {},
    workspaceId,
  );
}

export async function publishScriptVersion(
  workspaceId: string,
  input: {
    script: ScriptItem;
    releaseNote: string;
    visibility: Visibility;
  },
): Promise<StableVersion> {
  return apiRequest<StableVersion>(
    `/api/v1/scripts/${input.script.script_id}/versions`,
    {
      method: "POST",
      body: JSON.stringify({
        source_object_id: input.script.current_object_id,
        release_note: input.releaseNote.trim() || null,
        visibility: input.visibility,
      }),
    },
    workspaceId,
  );
}