import { describe, it, expect } from "vitest";
import { create } from "zustand";
import { immer } from "zustand/middleware/immer";
import { createGitHubSlice } from "./github-slice";
import type { GitHubSlice } from "./types";
import type { GitHubStatus, TaskPR } from "@/lib/types/github";

function makePR(overrides: Partial<TaskPR> = {}): TaskPR {
  return {
    id: "id",
    task_id: "task-1",
    owner: "o",
    repo: "r",
    pr_number: 1,
    pr_url: "",
    pr_title: "Test PR",
    head_branch: "feat",
    base_branch: "main",
    author_login: "alice",
    state: "open",
    review_state: "",
    checks_state: "",
    mergeable_state: "",
    review_count: 0,
    pending_review_count: 0,
    comment_count: 0,
    unresolved_review_threads: 0,
    checks_total: 0,
    checks_passing: 0,
    additions: 0,
    deletions: 0,
    created_at: "",
    merged_at: null,
    closed_at: null,
    last_synced_at: null,
    updated_at: "",
    ...overrides,
  };
}

function makeStore() {
  return create<GitHubSlice>()(immer((...a) => createGitHubSlice(...a)));
}

const FUTURE_RESET = "2030-01-01T00:00:00Z";
const NOW = "2026-05-04T12:00:00Z";

const baseStatus: GitHubStatus = {
  authenticated: true,
  username: "octocat",
  auth_method: "pat",
  token_configured: true,
  required_scopes: ["repo"],
};

describe("applyGitHubRateLimitUpdate", () => {
  it("merges incoming snapshots into the existing status", () => {
    const store = makeStore();
    store.getState().setGitHubStatus({ ...baseStatus });

    store.getState().applyGitHubRateLimitUpdate({
      trigger: "graphql",
      snapshots: [
        {
          resource: "graphql",
          remaining: 0,
          limit: 5000,
          reset_at: FUTURE_RESET,
          updated_at: NOW,
        },
        {
          resource: "core",
          remaining: 4500,
          limit: 5000,
          reset_at: FUTURE_RESET,
          updated_at: NOW,
        },
      ],
    });

    const status = store.getState().githubStatus.status;
    expect(status?.rate_limit?.graphql?.remaining).toBe(0);
    expect(status?.rate_limit?.graphql?.limit).toBe(5000);
    expect(status?.rate_limit?.core?.remaining).toBe(4500);
  });

  it("overwrites only the resources present in the update", () => {
    const store = makeStore();
    store.getState().setGitHubStatus({
      ...baseStatus,
      rate_limit: {
        core: {
          resource: "core",
          remaining: 4500,
          limit: 5000,
          reset_at: FUTURE_RESET,
          updated_at: NOW,
        },
      },
    });

    store.getState().applyGitHubRateLimitUpdate({
      trigger: "graphql",
      snapshots: [
        {
          resource: "graphql",
          remaining: 100,
          limit: 5000,
          reset_at: FUTURE_RESET,
          updated_at: NOW,
        },
      ],
    });

    const rl = store.getState().githubStatus.status?.rate_limit;
    expect(rl?.core?.remaining).toBe(4500); // untouched
    expect(rl?.graphql?.remaining).toBe(100);
  });

  it("is a no-op when status has not been hydrated yet", () => {
    const store = makeStore();
    expect(store.getState().githubStatus.status).toBeNull();

    store.getState().applyGitHubRateLimitUpdate({
      trigger: "core",
      snapshots: [
        {
          resource: "core",
          remaining: 0,
          limit: 5000,
          reset_at: FUTURE_RESET,
          updated_at: NOW,
        },
      ],
    });

    expect(store.getState().githubStatus.status).toBeNull();
  });
});

describe("setTaskPR", () => {
  it("appends a PR when the task has no rows yet", () => {
    const store = makeStore();
    const pr = makePR({ repository_id: "repo-a" });

    store.getState().setTaskPR("task-1", pr);

    expect(store.getState().taskPRs.byTaskId["task-1"]).toEqual([pr]);
  });

  it("upserts by repository_id so multi-repo PRs coexist", () => {
    const store = makeStore();
    const prA = makePR({ id: "a", repository_id: "repo-a", pr_number: 1 });
    const prB = makePR({ id: "b", repository_id: "repo-b", pr_number: 2 });
    const prAUpdated = makePR({ id: "a", repository_id: "repo-a", pr_number: 1, additions: 10 });

    store.getState().setTaskPR("task-1", prA);
    store.getState().setTaskPR("task-1", prB);
    store.getState().setTaskPR("task-1", prAUpdated);

    const list = store.getState().taskPRs.byTaskId["task-1"];
    expect(list).toHaveLength(2);
    expect(list.find((p) => p.repository_id === "repo-a")?.additions).toBe(10);
    expect(list.find((p) => p.repository_id === "repo-b")?.id).toBe("b");
  });

  it("heals a corrupted non-array entry instead of throwing", () => {
    // Simulates a stray payload landing in byTaskId[taskId] as something other
    // than an array (e.g. a partial hydration). The next setTaskPR call must
    // recover rather than propagate the bad shape, otherwise downstream
    // renderers crash with `prs is not iterable`.
    const store = makeStore();
    // eslint-disable-next-line @typescript-eslint/no-explicit-any
    store.getState().setTaskPRs({ "task-1": {} as any });

    const pr = makePR({ repository_id: "repo-a" });
    expect(() => store.getState().setTaskPR("task-1", pr)).not.toThrow();

    expect(Array.isArray(store.getState().taskPRs.byTaskId["task-1"])).toBe(true);
    expect(store.getState().taskPRs.byTaskId["task-1"]).toEqual([pr]);
  });
});