package usecase

import (
	"context"

	"cryptoHermes/internal/entity"
)

type MarketDataProvider interface {
	GetKlines(ctx context.Context, symbol, interval string, limit int) ([]entity.Kline, error)
	GetKlinesRange(ctx context.Context, symbol, interval string, startMs, endMs int64, limit int) ([]entity.Kline, error)
	GetTicker24h(ctx context.Context, symbol string) (*entity.Ticker24h, error)
}

type DerivativesProvider interface {
	GetCurrentFunding(ctx context.Context, symbol string) (*entity.FundingRate, error)
	GetFundingHistory(ctx context.Context, symbol string, limit int) ([]entity.FundingRate, error)

	GetCurrentOpenInterest(ctx context.Context, symbol string) (*entity.OpenInterest, error)
	GetOpenInterestHistory(ctx context.Context, symbol, period string, limit int) ([]entity.OpenInterest, error)

	GetGlobalLongShortRatio(ctx context.Context, symbol, period string, limit int) ([]entity.LongShortRatio, error)
	GetTopTraderPositionRatio(ctx context.Context, symbol, period string, limit int) ([]entity.LongShortRatio, error)

	GetTakerBuySellVolume(ctx context.Context, symbol, period string, limit int) ([]entity.TakerBuySellVolume, error)
}

type KlineRepository interface {
	UpsertMany(ctx context.Context, items []entity.Kline) error
	FindRecent(ctx context.Context, symbol, interval string, limit int) ([]entity.Kline, error)
}

type FundingRepository interface {
	UpsertMany(ctx context.Context, items []entity.FundingRate) error
	FindRecent(ctx context.Context, symbol string, limit int) ([]entity.FundingRate, error)
}

type OpenInterestRepository interface {
	UpsertMany(ctx context.Context, items []entity.OpenInterest) error
	FindRecent(ctx context.Context, symbol, period string, limit int) ([]entity.OpenInterest, error)
}

type LongShortRatioRepository interface {
	UpsertMany(ctx context.Context, items []entity.LongShortRatio) error
	FindRecent(ctx context.Context, symbol, period, ratioType string, limit int) ([]entity.LongShortRatio, error)
}

type TakerVolumeRepository interface {
	UpsertMany(ctx context.Context, items []entity.TakerBuySellVolume) error
	FindRecent(ctx context.Context, symbol, period string, limit int) ([]entity.TakerBuySellVolume, error)
}

// IndicatorComputer 纯函数式接口：接收已经被上层 fetch 的 slice，
// 返回填充好的 TechnicalStructure。
//
// 不持有任何 repo 引用——保住 G1（usecase 不依赖 repo 实现）和
// G12（indicator 包零 repo 导入）。MarketContextUsecase 已经并发 fetch
// 过 kline 与 long-short ratio，复用结果即可，二次注入仓库引用会
// 重复 IO。
//
// 实现可见 internal/usecase/indicator.go。
type IndicatorComputer interface {
	Compute(klines []entity.Kline, longShort []entity.LongShortRatio) entity.TechnicalStructure
}