export type PipelineAccent = 'green' | 'orange' | 'purple';

export type PipelineDeal = {
  id: string;
  title: string;
  description: string;
  amount: number | null;
  date: string;
  initials: string;
  /** شناسه مرحله فعلی — هنگام جابه‌جایی به‌روز می‌شود */
  stageId?: string;
  currencyUnit?: string;
};

export type PipelineUiCopy = {
  itemNoun: string;
  addItem: string;
  empty: string;
  addItemAria: string;
  itemMenuAria: string;
  listColTitle: string;
  hideAmount?: boolean;
};

export const DEAL_BOARD_COPY: PipelineUiCopy = {
  itemNoun: 'معامله',
  addItem: 'افزودن معامله',
  empty: 'معامله‌ای نیست',
  addItemAria: 'افزودن معامله به این مرحله',
  itemMenuAria: 'گزینه‌های معامله',
  listColTitle: 'معامله',
};

export const PROJECT_BOARD_COPY: PipelineUiCopy = {
  itemNoun: 'کارت',
  addItem: 'افزودن کارت',
  empty: 'کارتی نیست',
  addItemAria: 'افزودن کارت به این مرحله',
  itemMenuAria: 'گزینه‌های کارت',
  listColTitle: 'کارت',
  hideAmount: true,
};

export type PipelineStage = {
  id: string;
  title: string;
  color: PipelineAccent;
  deals: PipelineDeal[];
  isWon?: boolean;
  isLost?: boolean;
};

export const PIPELINE_ACCENT: Record<
  PipelineAccent,
  { soft: string; solid: string; text: string; border: string }
> = {
  green: {
    soft: '#ecfdf5',
    solid: '#10b981',
    text: '#047857',
    border: '#a7f3d0',
  },
  orange: {
    soft: '#fff7ed',
    solid: '#f59e0b',
    text: '#b45309',
    border: '#fde68a',
  },
  purple: {
    soft: '#f5f3ff',
    solid: '#8b5cf6',
    text: '#6d28d9',
    border: '#ddd6fe',
  },
};

const ACCENT_CYCLE: PipelineAccent[] = ['green', 'orange', 'purple'];

/** خروجی: ۲۵۰,۰۰۰,۰۰۰ تومان */
export function formatCurrency(amount: number, unit = 'تومان'): string {
  try {
    return `${new Intl.NumberFormat('fa-IR').format(amount)} ${unit}`;
  } catch {
    return `${amount} ${unit}`;
  }
}

export function formatCurrencyParts(
  amount: number,
  unit = 'تومان',
): { number: string; unit: string } {
  try {
    return {
      number: new Intl.NumberFormat('fa-IR').format(amount),
      unit,
    };
  } catch {
    return { number: String(amount), unit };
  }
}

export function initialsFromTitle(title: string): string {
  const parts = title
    .trim()
    .split(/\s+/)
    .filter(Boolean);
  if (!parts.length) return '؟';
  if (parts.length === 1) return parts[0]!.slice(0, 2);
  return parts
    .slice(0, 3)
    .map((p) => p[0]!)
    .join('');
}

export function currencyUnitLabel(currency: string): string {
  if (currency === 'IRR' || currency === 'IRT') return 'تومان';
  return currency;
}

/** نگاشت برد API به مدل UI کاریز */
export function mapBoardToStages(
  board: {
    stages: Array<{
      id: string;
      name: string;
      isWon: boolean;
      isLost: boolean;
      deals: Array<{
        id: string;
        title: string;
        amount: number | null;
        currency: string;
        notes: string | null;
        stageId: string;
        expectedCloseAt: string | null;
        createdAt: string;
        person: { fullName: string } | null;
        company: { name: string } | null;
      }>;
    }>;
  },
  formatDate: (iso: string) => string,
): PipelineStage[] {
  let openIndex = 0;
  return board.stages.map((stage) => {
    let color: PipelineAccent;
    if (stage.isWon) color = 'green';
    else if (stage.isLost) color = 'orange';
    else {
      color = ACCENT_CYCLE[openIndex % ACCENT_CYCLE.length]!;
      openIndex += 1;
    }

    return {
      id: stage.id,
      title: stage.name,
      color,
      isWon: stage.isWon,
      isLost: stage.isLost,
      deals: stage.deals.map((deal) => {
        const description =
          deal.notes?.trim() ||
          deal.company?.name ||
          deal.person?.fullName ||
          '';
        const dateIso = deal.expectedCloseAt || deal.createdAt;
        return {
          id: deal.id,
          title: deal.title,
          description,
          amount: deal.amount ?? 0,
          date: formatDate(dateIso),
          initials: initialsFromTitle(
            deal.company?.name || deal.title,
          ),
          stageId: deal.stageId,
          currencyUnit: currencyUnitLabel(deal.currency),
        };
      }),
    };
  });
}

export function mapProjectBoardToStages(
  board: {
    stages: Array<{
      id: string;
      name: string;
      cards: Array<{
        id: string;
        title: string;
        notes: string | null;
        stageId: string;
        createdAt: string;
        person: { fullName: string } | null;
        company: { name: string } | null;
        deal: { title: string } | null;
      }>;
    }>;
  },
  formatDate: (iso: string) => string,
): PipelineStage[] {
  return board.stages.map((stage, index) => ({
    id: stage.id,
    title: stage.name,
    color: ACCENT_CYCLE[index % ACCENT_CYCLE.length]!,
    deals: stage.cards.map((card) => ({
      id: card.id,
      title: card.title,
      description:
        card.company?.name ||
        card.person?.fullName ||
        card.deal?.title ||
        card.notes?.trim() ||
        '',
      amount: null,
      date: formatDate(card.createdAt),
      initials: initialsFromTitle(
        card.company?.name || card.person?.fullName || card.title,
      ),
      stageId: card.stageId,
    })),
  }));
}


/**
 * جابه‌جایی معامله بین مراحل یا تغییر ترتیب داخل یک مرحله.
 * فقط state محلی را تغییر می‌دهد — آماده اتصال به API.
 */
export function updateDealStage(
  stages: PipelineStage[],
  dealId: string,
  stageId: string,
  toIndex?: number,
): PipelineStage[] {
  let moving: PipelineDeal | null = null;
  let fromStageId = '';
  let fromIndex = -1;

  for (const stage of stages) {
    const idx = stage.deals.findIndex((d) => d.id === dealId);
    if (idx !== -1) {
      moving = stage.deals[idx]!;
      fromStageId = stage.id;
      fromIndex = idx;
      break;
    }
  }
  if (!moving) return stages;

  const without = stages.map((stage) => {
    if (stage.id !== fromStageId) return stage;
    return {
      ...stage,
      deals: stage.deals.filter((d) => d.id !== dealId),
    };
  });

  return without.map((stage) => {
    if (stage.id !== stageId) return stage;
    const next = [...stage.deals];
    let insertAt =
      toIndex == null || toIndex < 0 || toIndex > next.length
        ? next.length
        : toIndex;
    if (
      fromStageId === stageId &&
      fromIndex >= 0 &&
      toIndex != null &&
      toIndex > fromIndex
    ) {
      insertAt = Math.max(0, insertAt - 1);
    }
    next.splice(insertAt, 0, { ...moving!, stageId });
    return { ...stage, deals: next };
  });
}

export type PipelineBoardFilter = {
  query?: string;
  amountMin?: number | null;
  amountMax?: number | null;
};

export function filterStagesByQuery(
  stages: PipelineStage[],
  query: string,
): PipelineStage[] {
  return filterStages(stages, { query });
}

export function filterStages(
  stages: PipelineStage[],
  filter: PipelineBoardFilter,
): PipelineStage[] {
  const q = filter.query?.trim().toLowerCase() ?? '';
  const min = filter.amountMin;
  const max = filter.amountMax;
  const hasFilter =
    Boolean(q) ||
    (min != null && !Number.isNaN(min)) ||
    (max != null && !Number.isNaN(max));
  if (!hasFilter) return stages;
  return stages.map((stage) => ({
    ...stage,
    deals: stage.deals.filter((d) => {
      if (
        q &&
        !d.title.toLowerCase().includes(q) &&
        !d.description.toLowerCase().includes(q)
      ) {
        return false;
      }
      if (min != null && !Number.isNaN(min) && (d.amount == null || d.amount < min)) {
        return false;
      }
      if (max != null && !Number.isNaN(max) && (d.amount == null || d.amount > max)) {
        return false;
      }
      return true;
    }),
  }));
}

export function toFaItemCount(n: number, noun = 'معامله'): string {
  return `${new Intl.NumberFormat('fa-IR').format(n)} ${noun}`;
}

export function toFaDealCount(n: number): string {
  return toFaItemCount(n, 'معامله');
}

/** جابه‌جایی یک ستون به ایندکس جدید */
export function moveStageToIndex(
  stages: PipelineStage[],
  stageId: string,
  toIndex: number,
): PipelineStage[] {
  const from = stages.findIndex((s) => s.id === stageId);
  if (from < 0) return stages;
  const next = [...stages];
  const [item] = next.splice(from, 1);
  if (!item) return stages;
  const clamped = Math.max(0, Math.min(toIndex, next.length));
  next.splice(clamped, 0, item);
  return next;
}