package options

import (
	"context"

	decimal "github.com/alpacahq/alpacadecimal"
	"s1d3sw1ped/robinhood-agentic-mcp/client"
	"s1d3sw1ped/robinhood-agentic-mcp/internal/wire"
)

const (
	toolReview         = "review_option_order"
	toolPlace          = "place_option_order"
	toolCancel         = "cancel_option_order"
	toolReplace        = "replace_option_order"
	toolExercise       = "exercise_option"
	toolCancelExercise = "cancel_option_exercise"
)

// Leg is one contract in an option order.
type Leg struct {
	OptionID       string
	Side           client.Side
	PositionEffect string // "open" | "close"
	RatioQuantity  int
}

// PlaceOrderRequest is the argument set for review_option_order and place_option_order.
type PlaceOrderRequest struct {
	AccountNumber  string
	Legs           []Leg
	Direction      string
	Type           client.OrderType
	Quantity       *decimal.Decimal
	Price          *decimal.Decimal
	StopPrice      *decimal.Decimal
	TimeInForce    client.TimeInForce // empty → omit (Robinhood defaults gfd)
	MarketHours    client.MarketHours
	RefID          string
	ChainSymbol    string // review only
	UnderlyingType string // review only
}

// ReplaceOrderRequest is the argument set for replace_option_order.
type ReplaceOrderRequest struct {
	AccountNumber string
	OrderID       string
	Legs          []Leg
	Direction     string
	Type          client.OrderType
	Quantity      *decimal.Decimal
	Price         *decimal.Decimal
	StopPrice     *decimal.Decimal
	TimeInForce   client.TimeInForce
	MarketHours   client.MarketHours
	RefID         string
}

// ReviewResult is the pre-trade check from review_option_order.
type ReviewResult struct {
	Errors   []string `json:"errors"`
	Warnings []string `json:"warnings"`
	Alerts   []string `json:"alerts"`
}

// Order is a placed, replaced, or listed option order.
type Order struct {
	ID    string          `json:"id"`
	State string          `json:"state"`
	Qty   decimal.Decimal `json:"-"`
	Price decimal.Decimal `json:"-"`
}

// CancelOrderRequest is the argument set for cancel_option_order.
type CancelOrderRequest struct {
	AccountNumber string
	OrderID       string
}

// ExerciseRequest is the argument set for exercise_option.
type ExerciseRequest struct {
	AccountNumber string
	OptionID      string
	Quantity      int
	RefID         string
	Reason        string
	AllowShorts   bool
}

// ExerciseResult is the parsed exercise_option payload.
type ExerciseResult struct {
	ID    string `json:"id"`
	State string `json:"state"`
}

// CancelExerciseRequest is the argument set for cancel_option_exercise.
type CancelExerciseRequest struct {
	AccountNumber string
	OptionID      string
}

// ReviewOrder calls review_option_order. RefID is not sent.
func (c *Client) ReviewOrder(ctx context.Context, req PlaceOrderRequest) (ReviewResult, error) {
	var out ReviewResult
	if err := c.parse(ctx, toolReview, placeArgs(req, false, true), &out); err != nil {
		return ReviewResult{}, err
	}
	return out, nil
}

// PlaceOrder calls place_option_order. RefID is sent as ref_id.
func (c *Client) PlaceOrder(ctx context.Context, req PlaceOrderRequest) (Order, error) {
	raw, err := c.c.Call(ctx, toolPlace, placeArgs(req, true, false))
	if err != nil {
		return Order{}, err
	}
	ords, err := parseOrders(raw)
	if err != nil {
		return Order{}, client.ToolErrorf(toolPlace, "parse: %w", err)
	}
	if len(ords) > 0 {
		return ords[0], nil
	}
	return Order{}, nil
}

// CancelOrder calls cancel_option_order.
func (c *Client) CancelOrder(ctx context.Context, req CancelOrderRequest) error {
	args := map[string]any{}
	if req.AccountNumber != "" {
		args["account_number"] = req.AccountNumber
	}
	if req.OrderID != "" {
		args["order_id"] = req.OrderID
	}
	_, err := c.c.Call(ctx, toolCancel, args)
	return err
}

// ReplaceOrder calls replace_option_order.
func (c *Client) ReplaceOrder(ctx context.Context, req ReplaceOrderRequest) (Order, error) {
	args := placeArgs(PlaceOrderRequest{
		AccountNumber: req.AccountNumber,
		Legs:          req.Legs,
		Direction:     req.Direction,
		Type:          req.Type,
		Quantity:      req.Quantity,
		Price:         req.Price,
		StopPrice:     req.StopPrice,
		TimeInForce:   req.TimeInForce,
		MarketHours:   req.MarketHours,
		RefID:         req.RefID,
	}, true, false)
	if req.OrderID != "" {
		args["order_id"] = req.OrderID
	}
	raw, err := c.c.Call(ctx, toolReplace, args)
	if err != nil {
		return Order{}, err
	}
	ords, err := parseOrders(raw)
	if err != nil {
		return Order{}, client.ToolErrorf(toolReplace, "parse: %w", err)
	}
	if len(ords) > 0 {
		return ords[0], nil
	}
	return Order{}, nil
}

// Exercise calls exercise_option.
func (c *Client) Exercise(ctx context.Context, req ExerciseRequest) (ExerciseResult, error) {
	args := map[string]any{}
	if req.AccountNumber != "" {
		args["account_number"] = req.AccountNumber
	}
	if req.OptionID != "" {
		args["option_id"] = req.OptionID
	}
	if req.Quantity != 0 {
		args["quantity"] = req.Quantity
	}
	if req.RefID != "" {
		args["ref_id"] = req.RefID
	}
	if req.Reason != "" {
		args["reason"] = req.Reason
	}
	if req.AllowShorts {
		args["allow_shorts"] = true
	}
	var out ExerciseResult
	if err := c.parse(ctx, toolExercise, args, &out); err != nil {
		return ExerciseResult{}, err
	}
	return out, nil
}

// CancelExercise calls cancel_option_exercise.
func (c *Client) CancelExercise(ctx context.Context, req CancelExerciseRequest) error {
	args := map[string]any{}
	if req.AccountNumber != "" {
		args["account_number"] = req.AccountNumber
	}
	if req.OptionID != "" {
		args["option_id"] = req.OptionID
	}
	_, err := c.c.Call(ctx, toolCancelExercise, args)
	return err
}

func placeArgs(req PlaceOrderRequest, withRef, review bool) map[string]any {
	args := map[string]any{}
	if req.AccountNumber != "" {
		args["account_number"] = req.AccountNumber
	}
	if len(req.Legs) > 0 {
		legs := make([]map[string]any, len(req.Legs))
		for i, leg := range req.Legs {
			m := map[string]any{}
			if leg.OptionID != "" {
				m["option_id"] = leg.OptionID
			}
			if leg.Side != "" {
				m["side"] = string(leg.Side)
			}
			if leg.PositionEffect != "" {
				m["position_effect"] = leg.PositionEffect
			}
			if leg.RatioQuantity != 0 {
				m["ratio_quantity"] = leg.RatioQuantity
			}
			legs[i] = m
		}
		args["legs"] = legs
	}
	if req.Direction != "" {
		args["direction"] = req.Direction
	}
	if req.Type != "" {
		args["type"] = string(req.Type)
	}
	if req.Quantity != nil {
		args["quantity"] = wire.Encode(*req.Quantity)
	}
	if req.Price != nil {
		args["price"] = wire.Encode(*req.Price)
	}
	if req.StopPrice != nil {
		args["stop_price"] = wire.Encode(*req.StopPrice)
	}
	if req.TimeInForce != "" {
		args["time_in_force"] = string(req.TimeInForce)
	}
	if req.MarketHours != "" {
		args["market_hours"] = string(req.MarketHours)
	}
	if withRef && req.RefID != "" {
		args["ref_id"] = req.RefID
	}
	if review {
		if req.ChainSymbol != "" {
			args["chain_symbol"] = req.ChainSymbol
		}
		if req.UnderlyingType != "" {
			args["underlying_type"] = req.UnderlyingType
		}
	}
	return args
}