package bybit

import (
	"bytes"
	"context"
	"encoding/json"
	"fmt"
	"io"
	"net/http"
	"net/url"
)

type response struct {
	RetCode    int             `json:"retCode"`
	RetMsg     string          `json:"retMsg"`
	Result     json.RawMessage `json:"result"`
	Time       int64           `json:"time"`
	RetExtInfo json.RawMessage `json:"retExtInfo"`
}

func (b *Bybit) makeRequest(ctx context.Context, method string, endpoint string, params any, v any) error {
	// send request
	var (
		body []byte
		err  error
	)

	switch method {
	case http.MethodGet:
		body, err = b.getRequest(ctx, endpoint, params)
	case http.MethodPost:
		body, err = b.postRequest(ctx, endpoint, params)
	default:
		return fmt.Errorf("method not correct")
	}
	if err != nil {
		return fmt.Errorf("failed to make request: %w", err)
	}

	b.log.Debug("bybit request", "endpoint", endpoint, "params", params, "body", string(body))

	var resp response
	if err := json.Unmarshal(body, &resp); err != nil {
		return fmt.Errorf("failed to parse response: %w", err)
	}

	if resp.RetCode != 0 {
		return fmt.Errorf("response not ok: code: %d, msg: %s, info: %s, result: %s", resp.RetCode, resp.RetMsg, resp.RetExtInfo, resp.Result)
	}
	if v == nil {
		return nil
	}
	if err := json.Unmarshal(resp.Result, v); err != nil {
		return fmt.Errorf("failed to parse result: %w", err)
	}

	return nil
}

func (b *Bybit) getRequest(ctx context.Context, endPoint string, params any) ([]byte, error) {
	// params to query
	queryString := ""
	if params != nil {
		b, err := json.Marshal(params)
		if err != nil {
			return nil, err
		}
		var q map[string]any
		if err := json.Unmarshal(b, &q); err != nil {
			return nil, err
		}
		query := make(url.Values)
		for k, v := range q {
			query.Add(k, fmt.Sprint(v))
		}
		queryString = query.Encode()
	}

	// make request
	request, err := http.NewRequest("GET", b.cfg.BaseURL+endPoint+"?"+queryString, nil)
	if err != nil {
		return nil, fmt.Errorf("failed to make request: %w", err)
	}

	request = request.WithContext(ctx)

	request.Header.Set("Content-Type", "application/json")
	// b.setRequestAPIHeaders(request, []byte(queryString))

	// get response
	response, err := b.client.Do(request)
	if err != nil {
		return nil, fmt.Errorf("failed to make request: %w", err)
	}

	defer response.Body.Close()

	body, err := io.ReadAll(response.Body)
	if err != nil {
		return nil, fmt.Errorf("failed to read response: %w", err)
	}

	return body, nil
}

func (b *Bybit) postRequest(ctx context.Context, endPoint string, params any) ([]byte, error) {
	// params to json
	jsonData, err := json.Marshal(params)
	if err != nil {
		return nil, fmt.Errorf("failed to marshal params: %w", err)
	}

	// make request
	request, err := http.NewRequest("POST", b.cfg.BaseURL+endPoint, bytes.NewBuffer(jsonData))
	if err != nil {
		return nil, fmt.Errorf("failed to make request: %w", err)
	}

	request = request.WithContext(ctx)

	request.Header.Set("Content-Type", "application/json")
	// b.setRequestAPIHeaders(request, jsonData)

	// get response
	response, err := b.client.Do(request)
	if err != nil {
		return nil, fmt.Errorf("failed to make request: %w", err)
	}

	defer response.Body.Close()

	body, err := io.ReadAll(response.Body)
	if err != nil {
		return nil, fmt.Errorf("failed to read response: %w", err)
	}

	return body, nil
}