package chatgpt

import (
	"bytes"
	"encoding/json"
	"fmt"
	"io"
	"log"
	"net/http"
	"strings"

	"go-helper/internal/model"
)

// GetUsers fetches the list of members for a team account.
func (c *Client) GetUsers(account *model.GptAccount) (int, []model.ChatGPTUser, error) {
	apiURL := fmt.Sprintf("https://chatgpt.com/backend-api/accounts/%s/users?offset=0&limit=100&query=",
		account.ChatgptAccountID)

	req, err := http.NewRequest("GET", apiURL, nil)
	if err != nil {
		return 0, nil, err
	}
	req.Header = buildHeaders(account.Token, account.ChatgptAccountID)

	resp, err := c.httpClient.Do(req)
	if err != nil {
		return 0, nil, fmt.Errorf("获取成员列表网络错误: %w", err)
	}
	defer resp.Body.Close()

	body, _ := io.ReadAll(resp.Body)
	if err := checkAPIError(resp.StatusCode, body, "获取成员"); err != nil {
		return 0, nil, err
	}

	var data struct {
		Total int `json:"total"`
		Items []struct {
			ID            string `json:"id"`
			AccountUserID string `json:"account_user_id"`
			Email         string `json:"email"`
			Role          string `json:"role"`
			Name          string `json:"name"`
		} `json:"items"`
	}
	if err := json.Unmarshal(body, &data); err != nil {
		return 0, nil, fmt.Errorf("解析成员数据失败: %w", err)
	}

	var users []model.ChatGPTUser
	for _, item := range data.Items {
		users = append(users, model.ChatGPTUser{
			ID:            item.ID,
			AccountUserID: item.AccountUserID,
			Email:         item.Email,
			Role:          item.Role,
			Name:          item.Name,
		})
	}
	return data.Total, users, nil
}

// DeleteUser removes a user from the team account.
func (c *Client) DeleteUser(account *model.GptAccount, userID string) error {
	normalizedID := userID
	if !strings.HasPrefix(normalizedID, "user-") {
		normalizedID = "user-" + normalizedID
	}

	apiURL := fmt.Sprintf("https://chatgpt.com/backend-api/accounts/%s/users/%s",
		account.ChatgptAccountID, normalizedID)

	req, err := http.NewRequest("DELETE", apiURL, nil)
	if err != nil {
		return err
	}
	req.Header = buildHeaders(account.Token, account.ChatgptAccountID)

	resp, err := c.httpClient.Do(req)
	if err != nil {
		return fmt.Errorf("删除用户网络错误: %w", err)
	}
	defer resp.Body.Close()

	body, _ := io.ReadAll(resp.Body)
	if err := checkAPIError(resp.StatusCode, body, "删除用户"); err != nil {
		return err
	}

	log.Printf("[Member] 成功删除用户 %s (账号 %s)", normalizedID, account.ChatgptAccountID)
	return nil
}

// GetInvites fetches pending invitations for a team account.
func (c *Client) GetInvites(account *model.GptAccount) (int, []model.ChatGPTInvite, error) {
	apiURL := fmt.Sprintf("https://chatgpt.com/backend-api/accounts/%s/invites?offset=0&limit=100&query=",
		account.ChatgptAccountID)

	req, err := http.NewRequest("GET", apiURL, nil)
	if err != nil {
		return 0, nil, err
	}
	req.Header = buildHeaders(account.Token, account.ChatgptAccountID)
	req.Header.Set("Referer", "https://chatgpt.com/admin/members?tab=invites")

	resp, err := c.httpClient.Do(req)
	if err != nil {
		return 0, nil, fmt.Errorf("获取邀请列表网络错误: %w", err)
	}
	defer resp.Body.Close()

	body, _ := io.ReadAll(resp.Body)
	if err := checkAPIError(resp.StatusCode, body, "获取邀请列表"); err != nil {
		return 0, nil, err
	}

	var data struct {
		Total int `json:"total"`
		Items []struct {
			ID           string `json:"id"`
			EmailAddress string `json:"email_address"`
			Role         string `json:"role"`
		} `json:"items"`
	}
	if err := json.Unmarshal(body, &data); err != nil {
		return 0, nil, fmt.Errorf("解析邀请数据失败: %w", err)
	}

	var invites []model.ChatGPTInvite
	for _, item := range data.Items {
		invites = append(invites, model.ChatGPTInvite{
			ID:           item.ID,
			EmailAddress: item.EmailAddress,
			Role:         item.Role,
		})
	}
	return data.Total, invites, nil
}

// DeleteInvite cancels a pending invitation by email on the team account.
func (c *Client) DeleteInvite(account *model.GptAccount, email string) error {
	apiURL := fmt.Sprintf("https://chatgpt.com/backend-api/accounts/%s/invites",
		account.ChatgptAccountID)

	payload := map[string]string{"email_address": strings.TrimSpace(strings.ToLower(email))}
	bodyBytes, _ := json.Marshal(payload)

	req, err := http.NewRequest("DELETE", apiURL, bytes.NewReader(bodyBytes))
	if err != nil {
		return err
	}
	req.Header = buildHeaders(account.Token, account.ChatgptAccountID)
	req.Header.Set("Content-Type", "application/json")
	req.Header.Set("Referer", "https://chatgpt.com/admin/members?tab=invites")

	resp, err := c.httpClient.Do(req)
	if err != nil {
		return fmt.Errorf("删除邀请网络错误: %w", err)
	}
	defer resp.Body.Close()

	body, _ := io.ReadAll(resp.Body)
	if err := checkAPIError(resp.StatusCode, body, "删除邀请"); err != nil {
		return err
	}

	log.Printf("[Member] 成功删除邀请 %s (账号 %s)", email, account.ChatgptAccountID)
	return nil
}

// checkAPIError inspects the HTTP status code and returns a descriptive error.
func checkAPIError(statusCode int, body []byte, label string) error {
	if statusCode >= 200 && statusCode < 300 {
		return nil
	}

	bodyStr := truncate(string(body), 500)

	// Check for account_deactivated.
	if strings.Contains(bodyStr, "account_deactivated") {
		return fmt.Errorf("账号已停用 (account_deactivated)")
	}

	switch statusCode {
	case 401, 402:
		return fmt.Errorf("Token 已过期或被封禁")
	case 403:
		return fmt.Errorf("资源不存在或无权访问")
	case 429:
		return fmt.Errorf("API 请求过于频繁，请稍后重试")
	default:
		return fmt.Errorf("%s失败 (HTTP %d): %s", label, statusCode, bodyStr)
	}
}