package ghl

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

const ghlAPIBase = "https://services.leadconnectorhq.com"
const ghlAPIVersion = "2021-04-15"

type APIClient struct {
	baseURL    string
	httpClient *http.Client
}

func NewAPIClient() *APIClient {
	return &APIClient{
		baseURL:    ghlAPIBase,
		httpClient: &http.Client{Timeout: 30 * time.Second},
	}
}

func (c *APIClient) UpdateMessageStatus(ctx context.Context, accessToken, messageID, status string) error {
	body, err := json.Marshal(MessageStatusUpdate{Status: status})
	if err != nil {
		return err
	}

	u := fmt.Sprintf("%s/conversations/messages/%s/status", c.baseURL, messageID)
	req, err := http.NewRequestWithContext(ctx, http.MethodPut, u, bytes.NewReader(body))
	if err != nil {
		return err
	}
	req.Header.Set("Authorization", "Bearer "+accessToken)
	req.Header.Set("Content-Type", "application/json")
	req.Header.Set("Version", ghlAPIVersion)

	resp, err := c.httpClient.Do(req)
	if err != nil {
		return err
	}
	defer func() { _ = resp.Body.Close() }()
	respBody, err := io.ReadAll(resp.Body)
	if err != nil {
		return fmt.Errorf("ghl update status: failed to read response body: %w", err)
	}

	if resp.StatusCode < 200 || resp.StatusCode >= 300 {
		return fmt.Errorf("ghl update status returned %d: %s", resp.StatusCode, string(respBody))
	}
	return nil
}

func (c *APIClient) PostInboundMessage(ctx context.Context, accessToken string, msg *InboundMessage) (*InboundMessageResponse, error) {
	body, err := json.Marshal(msg)
	if err != nil {
		return nil, err
	}

	u := fmt.Sprintf("%s/conversations/messages/inbound", c.baseURL)
	req, err := http.NewRequestWithContext(ctx, http.MethodPost, u, bytes.NewReader(body))
	if err != nil {
		return nil, err
	}
	req.Header.Set("Authorization", "Bearer "+accessToken)
	req.Header.Set("Content-Type", "application/json")
	req.Header.Set("Version", ghlAPIVersion)

	resp, err := c.httpClient.Do(req)
	if err != nil {
		return nil, err
	}
	defer func() { _ = resp.Body.Close() }()
	respBody, err := io.ReadAll(resp.Body)
	if err != nil {
		return nil, err
	}

	if resp.StatusCode < 200 || resp.StatusCode >= 300 {
		return nil, fmt.Errorf("ghl inbound message returned %d: %s", resp.StatusCode, string(respBody))
	}

	var result InboundMessageResponse
	if err := json.Unmarshal(respBody, &result); err != nil {
		return nil, fmt.Errorf("failed to parse inbound message response: %w", err)
	}
	return &result, nil
}