package apimart

import (
	"context"
	"encoding/json"
	"errors"
	"fmt"
	"io"
	"net/http"
	"strings"

	"juhe-factory/api/internal/provider"
)

type BalanceResult struct {
	RemainBalance  float64 `json:"remain_balance"`
	RemainCredits  float64 `json:"remain_credits"`
	UsedBalance    float64 `json:"used_balance"`
	UsedCredits    float64 `json:"used_credits"`
	UnlimitedQuota bool    `json:"unlimited_quota"`
}

func (c Client) Balance(ctx context.Context, baseURL, apiKey string) (BalanceResult, error) {
	var result BalanceResult
	request, err := http.NewRequestWithContext(ctx, http.MethodGet, strings.TrimRight(baseURL, "/")+"/user/balance", nil)
	if err != nil {
		return result, err
	}
	request.Header.Set("Authorization", "Bearer "+apiKey)

	client := c.HTTPClient
	if client == nil {
		client = http.DefaultClient
	}
	response, err := client.Do(request)
	if err != nil {
		return result, err
	}
	defer response.Body.Close()

	data, err := io.ReadAll(io.LimitReader(response.Body, 1024*1024))
	if err != nil {
		return result, err
	}
	if response.StatusCode < 200 || response.StatusCode >= 300 {
		return result, &provider.HTTPError{StatusCode: response.StatusCode, Body: safeBody(data), RetryAfter: response.Header.Get("Retry-After")}
	}

	var decoded struct {
		Success bool   `json:"success"`
		Message string `json:"message"`
		BalanceResult
	}
	if err := json.Unmarshal(data, &decoded); err != nil {
		return result, fmt.Errorf("余额响应不是有效 JSON: %w", err)
	}
	if !decoded.Success {
		if decoded.Message == "" {
			return result, errors.New("获取渠道余额失败")
		}
		return result, errors.New(decoded.Message)
	}
	return decoded.BalanceResult, nil
}