import {
  type GitActionProgressEvent,
  type GitStackedAction,
  type ThreadId,
} from "@t3tools/contracts";
import {
  infiniteQueryOptions,
  mutationOptions,
  queryOptions,
  type QueryClient,
} from "@tanstack/react-query";
import { ensureNativeApi } from "../nativeApi";
import { getWsRpcClient } from "../wsRpcClient";

const GIT_BRANCHES_STALE_TIME_MS = 15_000;
const GIT_BRANCHES_REFETCH_INTERVAL_MS = 60_000;
const GIT_BRANCHES_PAGE_SIZE = 100;

export const gitQueryKeys = {
  all: ["git"] as const,
  branches: (cwd: string | null) => ["git", "branches", cwd] as const,
  branchSearch: (cwd: string | null, query: string) =>
    ["git", "branches", cwd, "search", query] as const,
};

export const gitMutationKeys = {
  init: (cwd: string | null) => ["git", "mutation", "init", cwd] as const,
  checkout: (cwd: string | null) => ["git", "mutation", "checkout", cwd] as const,
  runStackedAction: (cwd: string | null) => ["git", "mutation", "run-stacked-action", cwd] as const,
  pull: (cwd: string | null) => ["git", "mutation", "pull", cwd] as const,
  preparePullRequestThread: (cwd: string | null) =>
    ["git", "mutation", "prepare-pull-request-thread", cwd] as const,
};

export function invalidateGitQueries(queryClient: QueryClient, input?: { cwd?: string | null }) {
  const cwd = input?.cwd ?? null;
  if (cwd !== null) {
    return queryClient.invalidateQueries({ queryKey: gitQueryKeys.branches(cwd) });
  }

  return queryClient.invalidateQueries({ queryKey: gitQueryKeys.all });
}

function invalidateGitBranchQueries(queryClient: QueryClient, cwd: string | null) {
  if (cwd === null) {
    return Promise.resolve();
  }

  return queryClient.invalidateQueries({ queryKey: gitQueryKeys.branches(cwd) });
}

export function gitBranchSearchInfiniteQueryOptions(input: {
  cwd: string | null;
  query: string;
  enabled?: boolean;
}) {
  const normalizedQuery = input.query.trim();

  return infiniteQueryOptions({
    queryKey: gitQueryKeys.branchSearch(input.cwd, normalizedQuery),
    initialPageParam: 0,
    queryFn: async ({ pageParam }) => {
      const api = ensureNativeApi();
      if (!input.cwd) throw new Error("Git branches are unavailable.");
      return api.git.listBranches({
        cwd: input.cwd,
        ...(normalizedQuery.length > 0 ? { query: normalizedQuery } : {}),
        cursor: pageParam,
        limit: GIT_BRANCHES_PAGE_SIZE,
      });
    },
    getNextPageParam: (lastPage) => lastPage.nextCursor ?? undefined,
    enabled: input.cwd !== null && (input.enabled ?? true),
    staleTime: GIT_BRANCHES_STALE_TIME_MS,
    refetchOnWindowFocus: true,
    refetchOnReconnect: true,
    refetchInterval: GIT_BRANCHES_REFETCH_INTERVAL_MS,
  });
}

export function gitResolvePullRequestQueryOptions(input: {
  cwd: string | null;
  reference: string | null;
}) {
  return queryOptions({
    queryKey: ["git", "pull-request", input.cwd, input.reference] as const,
    queryFn: async () => {
      const api = ensureNativeApi();
      if (!input.cwd || !input.reference) {
        throw new Error("Pull request lookup is unavailable.");
      }
      return api.git.resolvePullRequest({ cwd: input.cwd, reference: input.reference });
    },
    enabled: input.cwd !== null && input.reference !== null,
    staleTime: 30_000,
    refetchOnWindowFocus: false,
    refetchOnReconnect: false,
  });
}

export function gitInitMutationOptions(input: { cwd: string | null; queryClient: QueryClient }) {
  return mutationOptions({
    mutationKey: gitMutationKeys.init(input.cwd),
    mutationFn: async () => {
      const api = ensureNativeApi();
      if (!input.cwd) throw new Error("Git init is unavailable.");
      return api.git.init({ cwd: input.cwd });
    },
    onSettled: async () => {
      await invalidateGitBranchQueries(input.queryClient, input.cwd);
    },
  });
}

export function gitCheckoutMutationOptions(input: {
  cwd: string | null;
  queryClient: QueryClient;
}) {
  return mutationOptions({
    mutationKey: gitMutationKeys.checkout(input.cwd),
    mutationFn: async (branch: string) => {
      const api = ensureNativeApi();
      if (!input.cwd) throw new Error("Git checkout is unavailable.");
      return api.git.checkout({ cwd: input.cwd, branch });
    },
    onSettled: async () => {
      await invalidateGitBranchQueries(input.queryClient, input.cwd);
    },
  });
}

export function gitRunStackedActionMutationOptions(input: {
  cwd: string | null;
  queryClient: QueryClient;
}) {
  return mutationOptions({
    mutationKey: gitMutationKeys.runStackedAction(input.cwd),
    mutationFn: async ({
      actionId,
      action,
      commitMessage,
      featureBranch,
      filePaths,
      onProgress,
    }: {
      actionId: string;
      action: GitStackedAction;
      commitMessage?: string;
      featureBranch?: boolean;
      filePaths?: string[];
      onProgress?: (event: GitActionProgressEvent) => void;
    }) => {
      if (!input.cwd) throw new Error("Git action is unavailable.");
      return getWsRpcClient().git.runStackedAction(
        {
          action,
          actionId,
          cwd: input.cwd,
          ...(commitMessage ? { commitMessage } : {}),
          ...(featureBranch ? { featureBranch: true } : {}),
          ...(filePaths && filePaths.length > 0 ? { filePaths } : {}),
        },
        ...(onProgress ? [{ onProgress }] : []),
      );
    },
    onSuccess: async () => {
      await invalidateGitBranchQueries(input.queryClient, input.cwd);
    },
  });
}

export function gitPullMutationOptions(input: { cwd: string | null; queryClient: QueryClient }) {
  return mutationOptions({
    mutationKey: gitMutationKeys.pull(input.cwd),
    mutationFn: async () => {
      const api = ensureNativeApi();
      if (!input.cwd) throw new Error("Git pull is unavailable.");
      return api.git.pull({ cwd: input.cwd });
    },
    onSuccess: async () => {
      await invalidateGitBranchQueries(input.queryClient, input.cwd);
    },
  });
}

export function gitCreateWorktreeMutationOptions(input: { queryClient: QueryClient }) {
  return mutationOptions({
    mutationKey: ["git", "mutation", "create-worktree"] as const,
    mutationFn: (
      args: Parameters<ReturnType<typeof ensureNativeApi>["git"]["createWorktree"]>[0],
    ) => ensureNativeApi().git.createWorktree(args),
    onSuccess: async () => {
      await invalidateGitQueries(input.queryClient);
    },
  });
}

export function gitRemoveWorktreeMutationOptions(input: { queryClient: QueryClient }) {
  return mutationOptions({
    mutationKey: ["git", "mutation", "remove-worktree"] as const,
    mutationFn: (
      args: Parameters<ReturnType<typeof ensureNativeApi>["git"]["removeWorktree"]>[0],
    ) => ensureNativeApi().git.removeWorktree(args),
    onSuccess: async () => {
      await invalidateGitQueries(input.queryClient);
    },
  });
}

export function gitPreparePullRequestThreadMutationOptions(input: {
  cwd: string | null;
  queryClient: QueryClient;
}) {
  return mutationOptions({
    mutationKey: gitMutationKeys.preparePullRequestThread(input.cwd),
    mutationFn: async (args: {
      reference: string;
      mode: "local" | "worktree";
      threadId?: ThreadId;
    }) => {
      const api = ensureNativeApi();
      if (!input.cwd) throw new Error("Pull request thread preparation is unavailable.");
      return api.git.preparePullRequestThread({
        cwd: input.cwd,
        reference: args.reference,
        mode: args.mode,
        ...(args.threadId ? { threadId: args.threadId } : {}),
      });
    },
    onSuccess: async () => {
      await invalidateGitBranchQueries(input.queryClient, input.cwd);
    },
  });
}