package remnawave

import (
	"context"
	"encoding/json"
	"fmt"
	"net/http"
	"time"
)

type CreateUserInput struct {
	Username             string
	ExpireAt             time.Time
	TelegramID           *int64
	ExternalSquadUUID    *string
	ActiveInternalSquads []string
	TrafficLimitBytes    *int64
	Description          string
}

type PanelUser struct {
	UUID       string
	Username   string
	ShortUUID  string
	Status     string
	ExpireAt   time.Time
	SubscriptionURL string
}

func (c *Client) CreateUser(ctx context.Context, in CreateUserInput) (*PanelUser, error) {
	payload := map[string]any{
		"username": in.Username,
		"expireAt": in.ExpireAt.UTC().Format(time.RFC3339Nano),
		"status":   "ACTIVE",
	}
	if in.TelegramID != nil {
		payload["telegramId"] = *in.TelegramID
	}
	if in.ExternalSquadUUID != nil && *in.ExternalSquadUUID != "" {
		payload["externalSquadUuid"] = *in.ExternalSquadUUID
	}
	if len(in.ActiveInternalSquads) > 0 {
		payload["activeInternalSquads"] = in.ActiveInternalSquads
	}
	if in.TrafficLimitBytes != nil {
		payload["trafficLimitBytes"] = *in.TrafficLimitBytes
	}
	if in.Description != "" {
		payload["description"] = in.Description
	}

	resp, body, err := c.post(ctx, "/api/users", payload)
	if err != nil {
		return nil, err
	}
	if resp.StatusCode != http.StatusOK && resp.StatusCode != http.StatusCreated {
		return nil, apiError(resp.StatusCode, body)
	}
	return parsePanelUser(body), nil
}

type AssignSquadsInput struct {
	UUID                 string
	Username             string
	ExternalSquadUUID    *string
	ActiveInternalSquads []string
}

func (c *Client) AssignSquads(ctx context.Context, in AssignSquadsInput) (*PanelUser, error) {
	if in.UUID == "" && in.Username == "" {
		return nil, fmt.Errorf("нужен uuid или username")
	}
	payload := map[string]any{}
	if in.UUID != "" {
		payload["uuid"] = in.UUID
	} else {
		payload["username"] = in.Username
	}
	if in.ExternalSquadUUID != nil {
		payload["externalSquadUuid"] = in.ExternalSquadUUID
	}
	if in.ActiveInternalSquads != nil {
		payload["activeInternalSquads"] = in.ActiveInternalSquads
	}

	resp, body, err := c.patch(ctx, "/api/users", payload)
	if err != nil {
		return nil, err
	}
	if resp.StatusCode != http.StatusOK {
		return nil, apiError(resp.StatusCode, body)
	}
	return parsePanelUser(body), nil
}

func parsePanelUser(body []byte) *PanelUser {
	var wrap struct {
		Response map[string]json.RawMessage `json:"response"`
	}
	if json.Unmarshal(body, &wrap) != nil || wrap.Response == nil {
		return nil
	}
	u := &PanelUser{}
	if raw, ok := wrap.Response["uuid"]; ok {
		_ = json.Unmarshal(raw, &u.UUID)
	}
	if raw, ok := wrap.Response["username"]; ok {
		_ = json.Unmarshal(raw, &u.Username)
	}
	if raw, ok := wrap.Response["shortUuid"]; ok {
		_ = json.Unmarshal(raw, &u.ShortUUID)
	}
	if raw, ok := wrap.Response["status"]; ok {
		_ = json.Unmarshal(raw, &u.Status)
	}
	if raw, ok := wrap.Response["expireAt"]; ok {
		var s string
		if json.Unmarshal(raw, &s) == nil {
			if t, err := time.Parse(time.RFC3339Nano, s); err == nil {
				u.ExpireAt = t
			}
		}
	}
	if raw, ok := wrap.Response["subscriptionUrl"]; ok {
		_ = json.Unmarshal(raw, &u.SubscriptionURL)
	}
	return u
}