/**
 * The shape of a run report, and the vocabulary it is written in.
 *
 * Kept separate from both the collector and the renderers so neither depends on
 * the other: `evidence.ts` gathers, `render-html.ts` presents, and both agree
 * on what a scenario is by importing from here.
 */
import type { TestResult } from '@playwright/test/reporter';

/** One captured moment inside a scenario. */
export interface Step {
  seq: string;
  name: string;
  shot?: string; // path relative to the report root
  facts?: Record<string, unknown>;
}

/** One test, as the report talks about it. */
export interface Scenario {
  project: string;
  file: string;
  suite: string;
  title: string;
  status: TestResult['status'];
  expected: boolean;
  durationMs: number;
  steps: Step[];
  error?: string;
}

/** How the run was configured, for the cover page. */
export interface RunMeta {
  baseURL: string;
  projects: string[];
  workers: number;
}

export interface Summary {
  generatedAt: string;
  outcome: string;
  durationMs: number;
  total: number;
  passed: number;
  failed: number;
  skipped: number;
  narrated: number;
  screenshots: number;
}

// --- areas -----------------------------------------------------------------

/**
 * Spec filenames are an implementation detail. The report groups by what the
 * tests actually cover, so somebody who has never opened the codebase can read
 * it without a glossary.
 */
export interface Area {
  title: string;
  blurb: string;
}

export const AREAS: Record<string, Area> = {
  'auth.spec.ts': {
    title: 'Signing in and sessions',
    blurb:
      'Agents sign in against their own agency. Credentials issued by one agency must not work at another, and a session should survive a page reload but not outlive a sign-out.',
  },
  'search.spec.ts': {
    title: 'Searching for flights',
    blurb:
      'Filtering the agency inventory by route, date, cabin and party size; ordering results by fare, journey time or departure; and paging through them.',
  },
  'booking.spec.ts': {
    title: 'Booking and cancelling',
    blurb:
      'Selling a ticket end to end: the fare carried into checkout, traveller details, confirmation with a booking reference, and cancellation returning the seats to inventory.',
  },
  'tenant-isolation.spec.ts': {
    title: 'Keeping agencies separate',
    blurb:
      'The central promise of the platform. Two agencies share one deployment and one database, and neither may see the other’s inventory, customers or revenue — not even by guessing a web address.',
  },
  'dashboard.spec.ts': {
    title: 'Agency dashboard',
    blurb:
      'Trading figures for the signed-in agency — revenue, seats sold, bookings and best-selling routes — and that they move correctly when a sale is made and when it is cancelled.',
  },
  'simulation.spec.ts': {
    title: 'Behaviour when things go wrong',
    blurb:
      'Here the backend is simulated so it can misbehave on demand: server errors, slow responses, a dropped network, an expired session, a seat sold mid-purchase, and awkward data such as very long names.',
  },
  'responsive.spec.ts': {
    title: 'Phones and small screens',
    blurb:
      'The console is used at a desk and on a phone. No screen may scroll sideways at phone width, and wide tables must scroll inside their own frame rather than stretching the page.',
  },
};

/** Reading order, rather than alphabetical: a reader follows the user journey. */
export const AREA_ORDER = [
  'auth.spec.ts',
  'search.spec.ts',
  'booking.spec.ts',
  'tenant-isolation.spec.ts',
  'dashboard.spec.ts',
  'simulation.spec.ts',
  'responsive.spec.ts',
];

export function areaFor(file: string): Area {
  const name = file.split('/').pop() ?? file;
  return AREAS[name] ?? { title: name, blurb: '' };
}

export function group(scenarios: Scenario[]): Array<{ name: string; items: Scenario[] }> {
  const map = new Map<string, Scenario[]>();
  for (const scenario of scenarios) {
    const list = map.get(scenario.file) ?? [];
    list.push(scenario);
    map.set(scenario.file, list);
  }

  const rank = (file: string) => {
    const index = AREA_ORDER.indexOf(file.split('/').pop() ?? file);
    return index === -1 ? AREA_ORDER.length : index;
  };

  return [...map.entries()]
    .sort(([a], [b]) => rank(a) - rank(b) || a.localeCompare(b))
    .map(([name, items]) => ({ name, items }));
}

// --- formatting ------------------------------------------------------------

export function escapeHtml(value: unknown): string {
  return String(value)
    .replace(/&/g, '&amp;')
    .replace(/</g, '&lt;')
    .replace(/>/g, '&gt;')
    .replace(/"/g, '&quot;');
}

export function formatValue(value: unknown): string {
  if (value === null || value === undefined) {
    return '—';
  }
  if (typeof value === 'boolean') {
    return value ? 'Yes' : 'No';
  }
  if (typeof value === 'object') {
    return JSON.stringify(value);
  }
  return String(value);
}

/** "1 min 30 s" reads better in a summary than "89.8 s". */
export function friendly(ms: number): string {
  if (ms < 1000) {
    return `${ms} ms`;
  }
  const total = Math.round(ms / 1000);
  const minutes = Math.floor(total / 60);
  const secs = total % 60;
  return minutes === 0 ? `${secs} s` : `${minutes} min ${String(secs).padStart(2, '0')} s`;
}

export function sentenceCase(value: string): string {
  return value.charAt(0).toUpperCase() + value.slice(1);
}

/** seatsAvailable -> "Seats available", so data tables read as English. */
export function label(key: string): string {
  const spaced = key
    .replace(/([a-z0-9])([A-Z])/g, '$1 $2')
    .replace(/[_-]+/g, ' ')
    .toLowerCase()
    .trim();
  return sentenceCase(spaced);
}

export function statusWord(status: Scenario['status']): string {
  switch (status) {
    case 'passed':
      return 'Passed';
    case 'skipped':
      return 'Not run';
    case 'timedOut':
      return 'Timed out';
    default:
      return 'Failed';
  }
}

export function statusClass(status: Scenario['status']): string {
  if (status === 'passed') {
    return 'pass';
  }
  return status === 'skipped' ? 'skip' : 'fail';
}