package integration

import (
	"bytes"
	"chatapp-cron/internal/config"
	"context"
	"encoding/json"
	"fmt"
	"io"
	"net/http"
	"net/url"
	"strconv"
	"strings"
)

type Client struct {
	cfg        config.Config
	httpClient *http.Client
}

type SendActivityRewardRequest struct {
	TrackID       int64  `json:"trackId"`
	Origin        string `json:"origin"`
	SysOrigin     string `json:"sysOrigin"`
	SourceGroupID int64  `json:"sourceGroupId"`
	AcceptUserID  int64  `json:"acceptUserId"`
}

type UserProfile struct {
	ID           Int64Value `json:"id"`
	UserAvatar   string     `json:"userAvatar"`
	UserNickname string     `json:"userNickname"`
}

type resultResponse[T any] struct {
	Code    int    `json:"code"`
	Message string `json:"message"`
	Body    T      `json:"body"`
	Success *bool  `json:"success"`
}

type Int64Value int64

func (v *Int64Value) UnmarshalJSON(data []byte) error {
	raw := strings.TrimSpace(string(data))
	if raw == "" || raw == "null" {
		*v = 0
		return nil
	}
	if strings.HasPrefix(raw, "\"") && strings.HasSuffix(raw, "\"") {
		raw = strings.Trim(raw, "\"")
	}
	parsed, err := strconv.ParseInt(raw, 10, 64)
	if err != nil {
		return err
	}
	*v = Int64Value(parsed)
	return nil
}

func New(cfg config.Config) *Client {
	return &Client{
		cfg: cfg,
		httpClient: &http.Client{
			Timeout: cfg.Timeout,
		},
	}
}

func (c *Client) SendActivityReward(ctx context.Context, req SendActivityRewardRequest) error {
	return c.postJSON(ctx, c.cfg.JavaOtherBaseURL+"/props-activity-cnf/client/sendActivityReward", req, nil)
}

func (c *Client) GetUserProfile(ctx context.Context, userID int64) (UserProfile, error) {
	endpoint := c.cfg.JavaOtherBaseURL + "/user-profile/client/getByUserId?userId=" + url.QueryEscape(strconv.FormatInt(userID, 10))
	var resp resultResponse[UserProfile]
	if err := c.getJSON(ctx, endpoint, &resp); err != nil {
		return UserProfile{}, err
	}
	if int64(resp.Body.ID) == 0 {
		return UserProfile{}, fmt.Errorf("empty user profile response")
	}
	return resp.Body, nil
}

func (c *Client) getJSON(ctx context.Context, endpoint string, out any) error {
	req, err := http.NewRequestWithContext(ctx, http.MethodGet, endpoint, nil)
	if err != nil {
		return err
	}
	resp, err := c.httpClient.Do(req)
	if err != nil {
		return err
	}
	defer resp.Body.Close()
	return decodeResponse(resp, out)
}

func (c *Client) postJSON(ctx context.Context, endpoint string, payload any, out any) error {
	data, err := json.Marshal(payload)
	if err != nil {
		return err
	}
	req, err := http.NewRequestWithContext(ctx, http.MethodPost, endpoint, bytes.NewReader(data))
	if err != nil {
		return err
	}
	req.Header.Set("Content-Type", "application/json")
	resp, err := c.httpClient.Do(req)
	if err != nil {
		return err
	}
	defer resp.Body.Close()
	return decodeResponse(resp, out)
}

func decodeResponse(resp *http.Response, out any) error {
	body, err := io.ReadAll(resp.Body)
	if err != nil {
		return err
	}
	if resp.StatusCode >= http.StatusBadRequest {
		return fmt.Errorf("java api failed: status=%d body=%s", resp.StatusCode, strings.TrimSpace(string(body)))
	}
	if out == nil || len(body) == 0 {
		return nil
	}
	if err := json.Unmarshal(body, out); err != nil {
		return fmt.Errorf("decode response failed: %w body=%s", err, strings.TrimSpace(string(body)))
	}
	return nil
}