package billing

import (
	"context"
	"errors"
	"fmt"
	"math"
	"strings"
	"time"
)

type Wallet struct {
	OrganizationID    string `json:"organizationId"`
	BalanceFen        int64  `json:"balanceFen"`
	TotalRechargedFen int64  `json:"totalRechargedFen"`
	TotalChargedFen   int64  `json:"totalChargedFen"`
	Currency          string `json:"currency,omitempty"`
	UpdatedAt         string `json:"updatedAt"`
}

type LedgerEntry struct {
	ID              string         `json:"id"`
	OrganizationID  string         `json:"organizationId"`
	AccountID       string         `json:"accountId,omitempty"`
	JobID           string         `json:"jobId,omitempty"`
	Kind            string         `json:"kind"`
	DeltaFen        int64          `json:"deltaFen"`
	BalanceAfterFen int64          `json:"balanceAfterFen"`
	Currency        string         `json:"currency"`
	IdempotencyKey  string         `json:"idempotencyKey"`
	Description     string         `json:"description"`
	Metadata        map[string]any `json:"metadata"`
	CreatedAt       string         `json:"createdAt"`
}

type Summary struct {
	RechargeFen    int64 `json:"rechargeFen"`
	ChargedFen     int64 `json:"chargedFen"`
	RefundedFen    int64 `json:"refundedFen"`
	NetConsumedFen int64 `json:"netConsumedFen"`
}
type AccountConfig struct {
	AccountName   string `json:"accountName,omitempty"`
	BankName      string `json:"bankName,omitempty"`
	AccountNumber string `json:"accountNumber,omitempty"`
	Contact       string `json:"contact,omitempty"`
}
type Organization struct {
	ID             string `json:"id"`
	Name           string `json:"name"`
	Status         string `json:"status"`
	ArchiveOwnerID string `json:"archiveOwnerId"`
	CreatedAt      string `json:"createdAt"`
	UpdatedAt      string `json:"updatedAt"`
	Wallet         Wallet `json:"wallet"`
}
type Member struct {
	ID             string `json:"id"`
	DisplayName    string `json:"displayName"`
	Phone          string `json:"phone"`
	Role           string `json:"role"`
	OrganizationID string `json:"organizationId,omitempty"`
	Status         string `json:"status"`
}
type Overview struct {
	Wallet         Wallet        `json:"wallet"`
	Ledger         []LedgerEntry `json:"ledger"`
	BillingAccount AccountConfig `json:"billingAccount"`
	Summary        Summary       `json:"summary"`
	Personal       Summary       `json:"personal"`
}
type AdminOverview struct {
	BillingAccount AccountConfig  `json:"billingAccount"`
	Organizations  []Organization `json:"organizations"`
	Members        []Member       `json:"members"`
	Ledger         []LedgerEntry  `json:"ledger"`
	PriceRules     []PriceRule    `json:"priceRules"`
}

type QuoteCommand struct {
	AccountID, OrganizationID, OrganizationName, Role string
	Provider, Capability, ReqKey                      string
	Parameters                                        Parameters
	Payload                                           map[string]any
}
type PricePatch struct {
	MarkupMultiplier        float64
	DimensionKey, TierValue string
}
type AdjustmentCommand struct {
	OrganizationID, OperatorID, Direction, Note string
	AmountFen, DeltaFen                         int64
}
type AdjustmentResult struct {
	Wallet Wallet
	Entry  LedgerEntry
}

type AccountConfigStore interface {
	Load(context.Context) (AccountConfig, error)
	Save(context.Context, AccountConfig) error
}

// ReadService is the deliberately cohesive persistence seam required by the
// Billing HTTP module. Implementations can execute overview reads concurrently.
type ReadService interface {
	Overview(context.Context, string, string) (Overview, error)
	AdminOverview(context.Context) (AdminOverview, error)
	ListPrices(context.Context) ([]PriceRule, error)
	GetPrice(context.Context, string) (*PriceRule, error)
}
type HTTPService interface {
	ReadService
	Quote(context.Context, QuoteCommand) (*Quote, error)
	UpdatePrice(context.Context, string, PricePatch) (*PriceRule, error)
	Adjust(context.Context, AdjustmentCommand) (AdjustmentResult, error)
}

var ErrPriceNotFound = errors.New("billing price not found")

func ValidatePricePatch(rule *PriceRule, patch PricePatch) error {
	if patch.MarkupMultiplier < 1 || patch.MarkupMultiplier > 1000 || math.IsNaN(patch.MarkupMultiplier) || math.IsInf(patch.MarkupMultiplier, 0) {
		return errors.New("上浮倍率必须在 1.00 至 1000.00 之间。")
	}
	if (patch.DimensionKey == "") != (patch.TierValue == "") {
		return errors.New("参数档位倍率更新必须同时提供参数维度和档位。")
	}
	if rule == nil {
		return ErrPriceNotFound
	}
	if patch.DimensionKey == "" && len(rule.Dimensions) > 0 {
		return errors.New("当前服务包含参数档位，请指定要调整的参数档位倍率。")
	}
	if patch.DimensionKey != "" {
		for _, dimension := range rule.Dimensions {
			if dimension.Key != patch.DimensionKey {
				continue
			}
			for _, tier := range dimension.Tiers {
				if strings.TrimSpace(fmt.Sprint(tier.Value)) == patch.TierValue {
					return nil
				}
			}
			return errors.New("计费参数档位不存在。")
		}
		return errors.New("计费参数维度不存在。")
	}
	return nil
}

func PostingResult(post WalletPosting, organizationID string) AdjustmentResult {
	return AdjustmentResult{
		Wallet: Wallet{OrganizationID: organizationID, BalanceFen: post.BalanceFen, TotalRechargedFen: post.TotalRechargedFen, TotalChargedFen: post.TotalChargedFen, Currency: CurrencyCNY, UpdatedAt: post.UpdatedAt.Format(time.RFC3339Nano)},
		Entry:  LedgerEntry{ID: post.LedgerID, OrganizationID: organizationID, DeltaFen: post.DeltaFen, BalanceAfterFen: post.BalanceAfterFen, Currency: CurrencyCNY, CreatedAt: post.CreatedAt.Format(time.RFC3339Nano)},
	}
}