import { create } from "zustand";
import { useSessionStore } from "@/stores/session-store";
import { queryClient } from "@/query/query-client";

const SUCCESS_DISPLAY_MS = 1000;

export type CheckoutGitActionStatus = "idle" | "pending" | "success";

export type CheckoutGitAsyncActionId =
  | "commit"
  | "push"
  | "create-pr"
  | "merge-branch"
  | "merge-from-base"
  | "archive-worktree";

type CheckoutKey = string;
type StatusMap = Partial<Record<CheckoutGitAsyncActionId, CheckoutGitActionStatus>>;

function checkoutKey(serverId: string, cwd: string): CheckoutKey {
  return `${serverId}::${cwd}`;
}

function resolveClient(serverId: string) {
  const session = useSessionStore.getState().sessions[serverId];
  const client = session?.client ?? null;
  if (!client) {
    throw new Error("Daemon client unavailable");
  }
  return client;
}

function setStatus(
  key: CheckoutKey,
  actionId: CheckoutGitAsyncActionId,
  status: CheckoutGitActionStatus,
) {
  useCheckoutGitActionsStore.setState((state) => {
    const current = state.statusByCheckout[key]?.[actionId] ?? "idle";
    if (current === status) {
      return state;
    }
    return {
      ...state,
      statusByCheckout: {
        ...state.statusByCheckout,
        [key]: {
          ...(state.statusByCheckout[key] ?? {}),
          [actionId]: status,
        },
      },
    };
  });
}

function invalidateCheckoutGitQueries(serverId: string, cwd: string) {
  void queryClient.invalidateQueries({
    queryKey: ["checkoutStatus", serverId, cwd],
  });
  void queryClient.invalidateQueries({
    predicate: (query) => {
      const key = query.queryKey;
      return (
        Array.isArray(key) && key[0] === "checkoutDiff" && key[1] === serverId && key[2] === cwd
      );
    },
  });
  void queryClient.invalidateQueries({
    predicate: (query) => {
      const key = query.queryKey;
      return (
        Array.isArray(key) && key[0] === "checkoutPrStatus" && key[1] === serverId && key[2] === cwd
      );
    },
  });
}

function invalidateWorktreeList() {
  void queryClient.invalidateQueries({
    predicate: (query) =>
      Array.isArray(query.queryKey) && query.queryKey[0] === "paseoWorktreeList",
  });
  void queryClient.invalidateQueries({
    predicate: (query) =>
      Array.isArray(query.queryKey) && query.queryKey[0] === "sidebarPaseoWorktreeList",
  });
}

function removeWorktreeFromCachedLists(input: { serverId: string; worktreePath: string }): void {
  const serverId = input.serverId.trim();
  const worktreePath = input.worktreePath.trim();
  if (!serverId || !worktreePath) {
    return;
  }

  const removeFromList = (current: unknown) => {
    if (!Array.isArray(current)) {
      return current;
    }
    const filtered = current.filter((entry) => entry?.worktreePath !== worktreePath);
    return filtered.length === current.length ? current : filtered;
  };

  queryClient.setQueriesData(
    {
      predicate: (query) =>
        Array.isArray(query.queryKey) &&
        query.queryKey[0] === "paseoWorktreeList" &&
        query.queryKey[1] === serverId,
    },
    removeFromList,
  );

  queryClient.setQueriesData(
    {
      predicate: (query) =>
        Array.isArray(query.queryKey) &&
        query.queryKey[0] === "sidebarPaseoWorktreeList" &&
        query.queryKey[1] === serverId,
    },
    removeFromList,
  );
}

const successTimers = new Map<string, ReturnType<typeof setTimeout>>();
const inFlight = new Map<string, Promise<unknown>>();

function inFlightKey(key: CheckoutKey, actionId: CheckoutGitAsyncActionId): string {
  return `${key}::${actionId}`;
}

interface CheckoutGitActionsStoreState {
  statusByCheckout: Record<CheckoutKey, StatusMap>;

  getStatus: (params: {
    serverId: string;
    cwd: string;
    actionId: CheckoutGitAsyncActionId;
  }) => CheckoutGitActionStatus;

  commit: (params: { serverId: string; cwd: string }) => Promise<void>;
  push: (params: { serverId: string; cwd: string }) => Promise<void>;
  createPr: (params: { serverId: string; cwd: string }) => Promise<void>;
  mergeBranch: (params: { serverId: string; cwd: string; baseRef: string }) => Promise<void>;
  mergeFromBase: (params: { serverId: string; cwd: string; baseRef: string }) => Promise<void>;
  archiveWorktree: (params: {
    serverId: string;
    cwd: string;
    worktreePath: string;
  }) => Promise<void>;
}

async function runCheckoutAction({
  serverId,
  cwd,
  actionId,
  run,
}: {
  serverId: string;
  cwd: string;
  actionId: CheckoutGitAsyncActionId;
  run: () => Promise<void>;
}): Promise<void> {
  const key = checkoutKey(serverId, cwd);
  const inflightId = inFlightKey(key, actionId);

  const existing = inFlight.get(inflightId);
  if (existing) {
    await existing;
    return;
  }

  const prevTimer = successTimers.get(inflightId);
  if (prevTimer) {
    clearTimeout(prevTimer);
    successTimers.delete(inflightId);
  }

  setStatus(key, actionId, "pending");

  const promise = (async () => {
    try {
      await run();
      invalidateCheckoutGitQueries(serverId, cwd);
      setStatus(key, actionId, "success");
      const timer = setTimeout(() => {
        setStatus(key, actionId, "idle");
        successTimers.delete(inflightId);
      }, SUCCESS_DISPLAY_MS);
      successTimers.set(inflightId, timer);
    } catch (error) {
      setStatus(key, actionId, "idle");
      throw error;
    } finally {
      inFlight.delete(inflightId);
    }
  })();

  inFlight.set(inflightId, promise);
  await promise;
}

export const useCheckoutGitActionsStore = create<CheckoutGitActionsStoreState>()((set, get) => ({
  statusByCheckout: {},

  getStatus: ({ serverId, cwd, actionId }) => {
    const key = checkoutKey(serverId, cwd);
    return get().statusByCheckout[key]?.[actionId] ?? "idle";
  },

  commit: async ({ serverId, cwd }) => {
    await runCheckoutAction({
      serverId,
      cwd,
      actionId: "commit",
      run: async () => {
        const client = resolveClient(serverId);
        const payload = await client.checkoutCommit(cwd, { addAll: true });
        if (payload.error) {
          throw new Error(payload.error.message);
        }
      },
    });
  },

  push: async ({ serverId, cwd }) => {
    await runCheckoutAction({
      serverId,
      cwd,
      actionId: "push",
      run: async () => {
        const client = resolveClient(serverId);
        const payload = await client.checkoutPush(cwd);
        if (payload.error) {
          throw new Error(payload.error.message);
        }
      },
    });
  },

  createPr: async ({ serverId, cwd }) => {
    await runCheckoutAction({
      serverId,
      cwd,
      actionId: "create-pr",
      run: async () => {
        const client = resolveClient(serverId);
        const payload = await client.checkoutPrCreate(cwd, {});
        if (payload.error) {
          throw new Error(payload.error.message);
        }
      },
    });
  },

  mergeBranch: async ({ serverId, cwd, baseRef }) => {
    await runCheckoutAction({
      serverId,
      cwd,
      actionId: "merge-branch",
      run: async () => {
        const client = resolveClient(serverId);
        const payload = await client.checkoutMerge(cwd, {
          baseRef,
          strategy: "merge",
          requireCleanTarget: true,
        });
        if (payload.error) {
          throw new Error(payload.error.message);
        }
      },
    });
  },

  mergeFromBase: async ({ serverId, cwd, baseRef }) => {
    await runCheckoutAction({
      serverId,
      cwd,
      actionId: "merge-from-base",
      run: async () => {
        const client = resolveClient(serverId);
        const payload = await client.checkoutMergeFromBase(cwd, {
          baseRef,
          requireCleanTarget: true,
        });
        if (payload.error) {
          throw new Error(payload.error.message);
        }
      },
    });
  },

  archiveWorktree: async ({ serverId, cwd, worktreePath }) => {
    await runCheckoutAction({
      serverId,
      cwd,
      actionId: "archive-worktree",
      run: async () => {
        const client = resolveClient(serverId);
        const payload = await client.archivePaseoWorktree({ worktreePath });
        if (payload.error) {
          throw new Error(payload.error.message);
        }
        removeWorktreeFromCachedLists({ serverId, worktreePath });
        invalidateWorktreeList();
      },
    });
  },
}));

export function __resetCheckoutGitActionsStoreForTests() {
  for (const timer of successTimers.values()) {
    clearTimeout(timer);
  }
  successTimers.clear();
  inFlight.clear();
  useCheckoutGitActionsStore.setState({ statusByCheckout: {} });
}