import { UpdateMarketDataDto } from '@ghostfolio/api/app/admin/update-market-data.dto';
import { DateQuery } from '@ghostfolio/api/app/portfolio/interfaces/date-query.interface';
import { DateRange } from '@ghostfolio/api/app/portfolio/interfaces/date-range.interface';
import { IDataGatheringItem } from '@ghostfolio/api/services/interfaces/interfaces';
import { PrismaService } from '@ghostfolio/api/services/prisma/prisma.service';
import { resetHours } from '@ghostfolio/common/helper';
import { UniqueAsset } from '@ghostfolio/common/interfaces';

import { Injectable } from '@nestjs/common';
import {
  DataSource,
  MarketData,
  MarketDataState,
  Prisma
} from '@prisma/client';

@Injectable()
export class MarketDataService {
  public constructor(private readonly prismaService: PrismaService) {}

  public async deleteMany({ dataSource, symbol }: UniqueAsset) {
    return this.prismaService.marketData.deleteMany({
      where: {
        dataSource,
        symbol
      }
    });
  }

  public async get({
    dataSource,
    date = new Date(),
    symbol
  }: IDataGatheringItem): Promise<MarketData> {
    return await this.prismaService.marketData.findFirst({
      where: {
        dataSource,
        symbol,
        date: resetHours(date)
      }
    });
  }

  public async getMax({ dataSource, symbol }: UniqueAsset) {
    return this.prismaService.marketData.findFirst({
      select: {
        date: true,
        marketPrice: true
      },
      orderBy: [
        {
          marketPrice: 'desc'
        }
      ],
      where: {
        dataSource,
        symbol
      }
    });
  }

  public async getRange({
    dateQuery,
    uniqueAssets
  }: {
    dateQuery: DateQuery;
    uniqueAssets: UniqueAsset[];
  }): Promise<MarketData[]> {
    return this.prismaService.marketData.findMany({
      orderBy: [
        {
          date: 'asc'
        },
        {
          symbol: 'asc'
        }
      ],
      where: {
        dataSource: {
          in: uniqueAssets.map(({ dataSource }) => {
            return dataSource;
          })
        },
        date: dateQuery,
        symbol: {
          in: uniqueAssets.map(({ symbol }) => {
            return symbol;
          })
        }
      }
    });
  }

  public async getDecimatedRange({
    dateRange: { start, end, step },
    symbols,
    dataSources
  }: {
    dateRange: DateRange;
    symbols: string[];
    dataSources: DataSource[];
  }): Promise<MarketData[]> {
    return this.prismaService.$queryRaw`
      WITH "lastDate" AS (
        SELECT "date" FROM "MarketData"
        WHERE "date" BETWEEN ${start} AND ${end}
        ORDER BY "date" DESC LIMIT 1
      ), "lastRows" AS (
        SELECT * FROM "MarketData"
        WHERE "date" = (SELECT "date" FROM "lastDate")
          AND "symbol" IN (${Prisma.join(symbols)})
          AND "dataSource"::text IN (${Prisma.join(dataSources)})
      )
      SELECT DISTINCT
        FIRST_VALUE("createdAt")    OVER w AS "createdAt",
        FIRST_VALUE("dataSource")   OVER w AS "dataSource",
        FIRST_VALUE("date")         OVER w AS "date",
        FIRST_VALUE("id")           OVER w AS "id",
        FIRST_VALUE("marketPrice")  OVER w AS "marketPrice",
        FIRST_VALUE("state")        OVER w AS "state",
        FIRST_VALUE("symbol")       OVER w AS "symbol"
      FROM "MarketData"
      WHERE "date" BETWEEN ${start} AND ${end} 
        AND "symbol" IN (${Prisma.join(symbols)})
        AND "dataSource"::text IN (${Prisma.join(dataSources)})
      WINDOW w AS (
        PARTITION BY "symbol", FLOOR(
          (EXTRACT(EPOCH FROM "date") - EXTRACT(EPOCH FROM ${start})) -- Subtract {start} to make it first value
            / (60 * 60 * 24 * ${step})                                -- Divide by {step} number of days
        ) ORDER BY "date"                                             -- Round down to make every {step} values equal
      )
      UNION SELECT * FROM "lastRows"                                  -- Add rows with the end date
      ORDER BY "date"
    `;
  }

  public async marketDataItems(params: {
    select?: Prisma.MarketDataSelectScalar;
    skip?: number;
    take?: number;
    cursor?: Prisma.MarketDataWhereUniqueInput;
    where?: Prisma.MarketDataWhereInput;
    orderBy?: Prisma.MarketDataOrderByWithRelationInput;
  }): Promise<MarketData[]> {
    const { select, skip, take, cursor, where, orderBy } = params;

    return this.prismaService.marketData.findMany({
      select,
      cursor,
      orderBy,
      skip,
      take,
      where
    });
  }

  public async updateMarketData(params: {
    data: {
      state: MarketDataState;
    } & UpdateMarketDataDto;
    where: Prisma.MarketDataWhereUniqueInput;
  }): Promise<MarketData> {
    const { data, where } = params;

    return this.prismaService.marketData.upsert({
      where,
      create: {
        dataSource: where.dataSource_date_symbol.dataSource,
        date: where.dataSource_date_symbol.date,
        marketPrice: data.marketPrice,
        state: data.state,
        symbol: where.dataSource_date_symbol.symbol
      },
      update: { marketPrice: data.marketPrice, state: data.state }
    });
  }

  /**
   * Upsert market data by imitating missing upsertMany functionality
   * with $transaction
   */
  public async updateMany({
    data
  }: {
    data: Prisma.MarketDataUpdateInput[];
  }): Promise<MarketData[]> {
    const upsertPromises = data.map(
      ({ dataSource, date, marketPrice, symbol, state }) => {
        return this.prismaService.marketData.upsert({
          create: {
            dataSource: <DataSource>dataSource,
            date: <Date>date,
            marketPrice: <number>marketPrice,
            state: <MarketDataState>state,
            symbol: <string>symbol
          },
          update: {
            marketPrice: <number>marketPrice,
            state: <MarketDataState>state
          },
          where: {
            dataSource_date_symbol: {
              dataSource: <DataSource>dataSource,
              date: <Date>date,
              symbol: <string>symbol
            }
          }
        });
      }
    );

    return this.prismaService.$transaction(upsertPromises);
  }
}