import { DatasetColor } from '@pi/ui';
import {
  IssueArea,
  IssueLinkType,
  IssuePriority,
  IssueStatus,
  IssueType,
  ProjectRole,
  ReleaseStatus,
} from '@task-stream/web/tracker/domain';

type ChipColor =
  | 'accent'
  | 'grey'
  | 'highlighted'
  | 'primary'
  | 'success'
  | 'warn';
type IconColor =
  | 'primary'
  | 'accent'
  | 'warn'
  | 'success'
  | 'grey'
  | 'highlighted';

/* UI copy (es) and the visual language of the tracker. */

/** `tone`: CSS colour token of the status/type (see `--ts-s-*`, `--ts-t-*` in styles.scss). */
export const STATUS: Record<
  IssueStatus,
  { label: string; color: ChipColor; chart: DatasetColor; tone: string }
> = {
  [IssueStatus.BACKLOG]: {
    label: 'Backlog',
    color: 'grey',
    chart: DatasetColor.grey,
    tone: 'var(--ts-s-backlog)',
  },
  [IssueStatus.TODO]: {
    label: 'Por hacer',
    color: 'grey',
    chart: DatasetColor.grey300,
    tone: 'var(--ts-s-todo)',
  },
  [IssueStatus.IN_PROGRESS]: {
    label: 'En curso',
    color: 'primary',
    chart: DatasetColor.primary,
    tone: 'var(--ts-s-progress)',
  },
  [IssueStatus.IN_REVIEW]: {
    label: 'En revisión',
    color: 'accent',
    chart: DatasetColor.accent,
    tone: 'var(--ts-s-review)',
  },
  [IssueStatus.READY_FOR_QA]: {
    label: 'Listo para QA',
    color: 'highlighted',
    chart: DatasetColor.highlighted,
    tone: 'var(--ts-s-ready)',
  },
  [IssueStatus.IN_QA]: {
    label: 'En QA',
    color: 'highlighted',
    chart: DatasetColor.highlighted50,
    tone: 'var(--ts-s-qa)',
  },
  [IssueStatus.QA_FAILED]: {
    label: 'QA fallido',
    color: 'warn',
    chart: DatasetColor.warn,
    tone: 'var(--ts-s-failed)',
  },
  [IssueStatus.DONE]: {
    label: 'Hecho',
    color: 'success',
    chart: DatasetColor.success,
    tone: 'var(--ts-s-done)',
  },
  [IssueStatus.CANCELLED]: {
    label: 'Cancelado',
    color: 'grey',
    chart: DatasetColor.grey50,
    tone: 'var(--ts-s-cancelled)',
  },
};

export const TYPE: Record<
  IssueType,
  { label: string; icon: string; color: IconColor; tone: string }
> = {
  [IssueType.BUG]: {
    label: 'Bug',
    icon: 'bug',
    color: 'warn',
    tone: 'var(--ts-t-bug)',
  },
  [IssueType.FEATURE]: {
    label: 'Feature',
    icon: 'feature',
    color: 'primary',
    tone: 'var(--ts-t-feature)',
  },
  [IssueType.UI_CHANGE]: {
    label: 'Cambio de UI',
    icon: 'palette',
    color: 'accent',
    tone: 'var(--ts-t-ui)',
  },
  [IssueType.TASK]: {
    label: 'Tarea',
    icon: 'task',
    color: 'grey',
    tone: 'var(--ts-t-task)',
  },
  [IssueType.QA]: {
    label: 'QA',
    icon: 'qa',
    color: 'highlighted',
    tone: 'var(--ts-t-qa)',
  },
};

/** Signal strength of a priority, drawn as bars (1–4) like a phone signal. */
export const PRIORITY_LEVEL: Record<IssuePriority, number> = {
  [IssuePriority.CRITICAL]: 4,
  [IssuePriority.HIGH]: 3,
  [IssuePriority.MEDIUM]: 2,
  [IssuePriority.LOW]: 1,
  [IssuePriority.LOWEST]: 0,
};

export const PRIORITY: Record<
  IssuePriority,
  { label: string; color: ChipColor }
> = {
  [IssuePriority.CRITICAL]: { label: 'Crítica', color: 'warn' },
  [IssuePriority.HIGH]: { label: 'Alta', color: 'accent' },
  [IssuePriority.MEDIUM]: { label: 'Media', color: 'primary' },
  [IssuePriority.LOW]: { label: 'Baja', color: 'grey' },
  [IssuePriority.LOWEST]: { label: 'Mínima', color: 'grey' },
};

export const AREA: Record<IssueArea, string> = {
  [IssueArea.FRONTEND]: 'Frontend',
  [IssueArea.BACKEND]: 'Backend',
  [IssueArea.MOBILE]: 'Mobile',
  [IssueArea.QA]: 'QA',
  [IssueArea.DESIGN]: 'Diseño',
  [IssueArea.DEVOPS]: 'DevOps',
};

export const LINK: Record<IssueLinkType, { outward: string; inward: string }> =
  {
    [IssueLinkType.BLOCKS]: {
      outward: 'bloquea a',
      inward: 'está bloqueado por',
    },
    [IssueLinkType.DEPENDS_ON]: {
      outward: 'depende de',
      inward: 'es dependencia de',
    },
    [IssueLinkType.TESTS]: { outward: 'prueba', inward: 'es probado por' },
    [IssueLinkType.DUPLICATES]: {
      outward: 'duplica a',
      inward: 'está duplicado por',
    },
    [IssueLinkType.RELATES_TO]: {
      outward: 'relacionado con',
      inward: 'relacionado con',
    },
  };

export const ROLE: Record<ProjectRole, string> = {
  [ProjectRole.OWNER]: 'Propietario',
  [ProjectRole.ADMIN]: 'Admin',
  [ProjectRole.MEMBER]: 'Miembro',
  [ProjectRole.VIEWER]: 'Lector',
};

export const RELEASE_STATUS: Record<
  ReleaseStatus,
  { label: string; color: ChipColor }
> = {
  [ReleaseStatus.PLANNED]: { label: 'Planificada', color: 'primary' },
  [ReleaseStatus.RELEASED]: { label: 'Publicada', color: 'success' },
  [ReleaseStatus.ARCHIVED]: { label: 'Archivada', color: 'grey' },
};

export const options = <T extends string>(
  record: Record<T, string | { label: string }>,
) =>
  (Object.keys(record) as T[]).map((value) => {
    const entry = record[value];
    return { value, label: typeof entry === 'string' ? entry : entry.label };
  });

/** "hace 5 min", "ayer"… */
export function timeAgo(iso: string, now = Date.now()): string {
  const seconds = Math.max(0, Math.round((now - Date.parse(iso)) / 1000));
  const rtf = new Intl.RelativeTimeFormat('es', { numeric: 'auto' });
  if (seconds < 60) return rtf.format(-seconds, 'second');
  if (seconds < 3600) return rtf.format(-Math.round(seconds / 60), 'minute');
  if (seconds < 86400) return rtf.format(-Math.round(seconds / 3600), 'hour');
  return rtf.format(-Math.round(seconds / 86400), 'day');
}

const PROJECT_TONES = [
  'var(--ts-t-feature)',
  'var(--ts-s-review)',
  'var(--ts-t-ui)',
  'var(--ts-t-qa)',
  'var(--ts-s-done)',
  'var(--ts-s-qa)',
];

/** A stable colour per project (from its key), so it is recognisable everywhere. */
export function projectTone(key: string): string {
  let hash = 0;
  for (const char of key) hash = (hash * 31 + char.charCodeAt(0)) >>> 0;
  return PROJECT_TONES[hash % PROJECT_TONES.length];
}

/** "Ana García" → "AG". */
export function initials(name: string): string {
  return name
    .split(/\s+/)
    .filter(Boolean)
    .map((part) => part[0])
    .join('')
    .slice(0, 2)
    .toUpperCase();
}

/** "14:05" today, "3 oct" otherwise (logs and histories). */
export function clock(iso: string, now = new Date()): string {
  const date = new Date(iso);
  return date.toDateString() === now.toDateString()
    ? date.toLocaleTimeString('es', { hour: '2-digit', minute: '2-digit' })
    : date.toLocaleDateString('es', { day: 'numeric', month: 'short' });
}