import { Injectable } from '@nestjs/common';
import type { ImportContactsResult } from '@mento/shared';
import { PrismaService } from '../prisma/prisma.service';
import type { Actor } from '../common/record-scope';
import { projectCardAccessWhere } from '../common/record-scope';
import { normalizePhone } from '../contacts/normalize';
import {
  excelFieldsFromColumns,
  formatJalaliDate,
  parseExcelMapping,
  parseJalaliDateTime,
  previewExcel,
  readMappedRows,
  stripHtml,
  writeXlsx,
  type ExcelPreviewResult,
} from '../common/excel';
import {
  chunkImportMeta,
  resolveExcelImportChunk,
} from '../common/excel-import-session';
import { ProjectBoardsService } from './project-boards.service';

const CASE_COLUMNS = [
  { header: '_type', key: '_type', width: 12 },
  { header: 'کد دیدار کارت', key: 'didarId', width: 14 },
  { header: 'عنوان کارت', key: 'title', width: 28 },
  { header: 'توضیحات کارت', key: 'notes', width: 32 },
  { header: 'وضعیت کارت', key: 'status', width: 12 },
  { header: 'مسئول کارت', key: 'ownerName', width: 16 },
  { header: 'مجوز مشاهده کارت', key: 'visibility', width: 18 },
  { header: 'تاریخ ثبت کارت', key: 'createdAt', width: 16 },
  { header: 'نام خانوادگی شخص کارت', key: 'personName', width: 22 },
  { header: 'کد دیدار شخص', key: 'personCode', width: 14 },
  { header: 'موبایل شخص کارت', key: 'personMobile', width: 16 },
  { header: 'تابلوی پروژه کارت', key: 'boardName', width: 20 },
  { header: 'مرحله تابلوی پروژه کارت', key: 'stageName', width: 18 },
  { header: 'تاریخ انجام کارت', key: 'doneDate', width: 16 },
  { header: 'برچسب', key: 'tag', width: 16 },
];

const CASE_ALIASES: Record<string, string> = {
  _type: '_type',
  type: '_type',
  کددیدارکارت: 'didarId',
  عنوانکارت: 'title',
  عنوان: 'title',
  توضیحاتکارت: 'notes',
  وضعیتکارت: 'status',
  مسئولکارت: 'ownerName',
  مجوزمشاهدهکارت: 'visibility',
  تاریخثبتکارت: 'createdAt',
  نامخانوادگیشخصکارت: 'personName',
  کددیدارشخص: 'personCode',
  موبایلشخصکارت: 'personMobile',
  تابلویپروژهکارت: 'boardName',
  مرحلهتابلویپروژهکارت: 'stageName',
  // سرستون‌های قدیمی (قبل از تغییر نام کاریز → تابلوی پروژه)
  کاریزکارت: 'boardName',
  مرحلهکاریزکارت: 'stageName',
  تاریخانجامکارت: 'doneDate',
  برچسب: 'tag',
};

function isClosedStatus(raw?: string) {
  return /بسته|انجام|done|closed/i.test(raw ?? '');
}

@Injectable()
export class ProjectCardsExcelService {
  constructor(
    private readonly prisma: PrismaService,
    private readonly boards: ProjectBoardsService,
  ) {}

  async export(actor: Actor): Promise<Buffer> {
    const rows = await this.prisma.projectCard.findMany({
      where: { organizationId: actor.organizationId, ...projectCardAccessWhere(actor) },
      include: {
        person: {
          select: { id: true, firstName: true, lastName: true, mobile: true },
        },
        owner: { select: { fullName: true } },
        board: { select: { name: true } },
        stage: { select: { name: true } },
      },
      orderBy: [{ createdAt: 'desc' }],
      take: 10000,
    });

    return writeXlsx(
      'Case',
      CASE_COLUMNS,
      rows.map((row) => {
        const closed = /انجام|بسته|done/i.test(row.stage.name);
        return {
          _type: 'Case',
          didarId: row.id,
          title: row.title,
          notes: row.notes ?? '',
          status: closed ? 'بسته' : 'باز',
          ownerName: row.owner?.fullName ?? '',
          visibility: 'همه افراد شرکت',
          createdAt: formatJalaliDate(row.createdAt),
          personName: row.person
            ? `${row.person.firstName} ${row.person.lastName}`.trim()
            : '',
          personCode: row.person?.id ?? '',
          personMobile: row.person?.mobile ?? '',
          boardName: row.board.name,
          stageName: row.stage.name,
          doneDate: closed ? formatJalaliDate(row.updatedAt) : '',
          tag: '',
        };
      }),
    );
  }

  preview(file: Express.Multer.File): Promise<ExcelPreviewResult> {
    return previewExcel(file, CASE_ALIASES, excelFieldsFromColumns(CASE_COLUMNS, ['title']));
  }

  async import(
    actor: Actor,
    file: Express.Multer.File | undefined,
    mappingRaw?: string,
    chunk?: { sessionId?: string; offset?: string | number; limit?: string | number },
  ): Promise<ImportContactsResult> {
    const ctx = await resolveExcelImportChunk({
      organizationId: actor.organizationId,
      file,
      sessionId: chunk?.sessionId,
      offset: chunk?.offset,
      limit: chunk?.limit,
      loadRows: () =>
        readMappedRows(file!, CASE_ALIASES, parseExcelMapping(mappingRaw)),
    });
    const result: ImportContactsResult = { created: 0, skipped: 0, errors: [] };
    const affected = new Map<string, string>();

    for (let i = 0; i < ctx.slice.length; i++) {
      const row = ctx.slice[i]!;
      const rowNum = ctx.offset + i + 2;
      if ((row._type || '').trim() && row._type.trim().toLowerCase() !== 'case') {
        continue;
      }
      const title = (row.title || '').trim();
      if (title.length < 2) {
        result.errors.push({ row: rowNum, message: 'عنوان کارت الزامی است' });
        continue;
      }

      try {
        const { boardId, stageId, boardName } = await this.resolveBoardAndStage(
          actor.organizationId,
          row.boardName,
          row.stageName,
          isClosedStatus(row.status),
        );
        affected.set(boardId, boardName);
        const duplicate = await this.prisma.projectCard.findFirst({
          where: { organizationId: actor.organizationId, boardId, title },
          select: { id: true },
        });
        if (duplicate) {
          result.skipped += 1;
          continue;
        }

        const personId = await this.findPersonId(actor.organizationId, row);
        const ownerId = await this.findUserId(actor.organizationId, row.ownerName);
        const notes = [stripHtml(row.notes ?? ''), row.tag, row.didarId ? `کد دیدار: ${row.didarId}` : '']
          .map((part) => part.trim())
          .filter(Boolean)
          .join('\n');
        const doneAt = parseJalaliDateTime(row.doneDate);
        const notesWithDone = doneAt
          ? `${notes}${notes ? '\n' : ''}تاریخ انجام: ${row.doneDate}`.trim()
          : notes;

        await this.boards.createCard(actor.organizationId, actor, {
          title,
          boardId,
          stageId,
          notes: notesWithDone || undefined,
          personId,
          ownerId,
        });
        result.created += 1;
      } catch (e) {
        result.errors.push({
          row: rowNum,
          message: e instanceof Error ? e.message : 'خطای ناشناخته',
        });
      }
    }

    const entries = [...affected.entries()];
    if (entries[0]) {
      result.boardId = entries[0][0];
      result.boards = entries.map(([, n]) => n);
    }

    return { ...result, ...chunkImportMeta(ctx) };
  }

  private async resolveBoardAndStage(
    organizationId: string,
    boardName?: string,
    stageName?: string,
    closed = false,
  ) {
    const name = boardName?.trim() || 'پروژه داخلی';
    const wanted = stageName?.trim();
    let board = await this.prisma.projectBoard.findFirst({
      where: { organizationId, name: { equals: name, mode: 'insensitive' } },
      include: { stages: { orderBy: { position: 'asc' } } },
    });
    if (!board) {
      const stageCreates = wanted
        ? [{ name: wanted, position: 0 }]
        : [
            { name: 'صف', position: 0 },
            { name: 'در حال انجام', position: 1 },
            { name: 'بازبینی', position: 2 },
            { name: 'انجام‌شده', position: 3 },
          ];
      board = await this.prisma.projectBoard.create({
        data: {
          organizationId,
          name,
          isDefault: false,
          stages: { create: stageCreates },
        },
        include: { stages: { orderBy: { position: 'asc' } } },
      });
    }

    if (wanted) {
      const existing = board.stages.find(
        (s) => s.name.trim().toLowerCase() === wanted.toLowerCase(),
      );
      if (existing) return { boardId: board.id, stageId: existing.id, boardName: board.name };
      const maxPos = board.stages.reduce((m, s) => Math.max(m, s.position), -1);
      const stage = await this.prisma.projectBoardStage.create({
        data: { boardId: board.id, name: wanted, position: maxPos + 1 },
      });
      return { boardId: board.id, stageId: stage.id, boardName: board.name };
    }

    const stage = closed
      ? board.stages[board.stages.length - 1]
      : board.stages[0];
    if (!stage) throw new Error('برد مرحله‌ای ندارد');
    return { boardId: board.id, stageId: stage.id, boardName: board.name };
  }

  private async findPersonId(organizationId: string, row: Record<string, string>) {
    const mobile = normalizePhone(row.personMobile);
    if (mobile) {
      const needle = mobile.replace(/^\+98|^98|^0/, '');
      const byMobile = await this.prisma.person.findFirst({
        where: { organizationId, mobile: { contains: needle } },
        select: { id: true },
      });
      if (byMobile) return byMobile.id;
    }
    const name = (row.personName ?? '').trim();
    if (name) {
      const byName = await this.prisma.person.findFirst({
        where: {
          organizationId,
          OR: [
            { lastName: { contains: name, mode: 'insensitive' } },
            { firstName: { contains: name.split(/\s+/)[0]!, mode: 'insensitive' } },
          ],
        },
        select: { id: true },
      });
      if (byName) return byName.id;
    }
    return null;
  }

  private async findUserId(organizationId: string, name?: string) {
    const n = name?.trim();
    if (!n) return null;
    const row = await this.prisma.user.findFirst({
      where: {
        fullName: { contains: n, mode: 'insensitive' },
        memberships: { some: { organizationId } },
      },
      select: { id: true },
    });
    return row?.id ?? null;
  }
}