package destinations

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

// Paperclip files one slow, recorded job after a tap-to-approve
// (docs/hub-api.md section 6). The Hub files the job once.
type Paperclip struct {
	URL       string
	APIKey    string
	CompanyID string
	Timeout   time.Duration
	HTTP      *http.Client
}

// NewPaperclip builds the Paperclip client.
func NewPaperclip(url, key, companyID string, timeout time.Duration) *Paperclip {
	if timeout <= 0 {
		timeout = 5 * time.Second
	}
	return &Paperclip{
		URL:       strings.TrimRight(url, "/"),
		APIKey:    key,
		CompanyID: companyID,
		Timeout:   timeout,
		HTTP:      &http.Client{Timeout: timeout},
	}
}

// FileJob creates one Paperclip issue. It returns the issue id.
func (p *Paperclip) FileJob(ctx context.Context, title, description string) (string, error) {
	if p == nil || p.URL == "" || p.APIKey == "" || p.CompanyID == "" {
		return "", fmt.Errorf("paperclip: not configured")
	}
	body, err := json.Marshal(map[string]string{
		"title":       title,
		"description": description,
		"priority":    "medium",
	})
	if err != nil {
		return "", err
	}
	ctx, cancel := context.WithTimeout(ctx, p.Timeout)
	defer cancel()

	url := fmt.Sprintf("%s/api/companies/%s/issues", p.URL, p.CompanyID)
	req, err := http.NewRequestWithContext(ctx, http.MethodPost, url, bytes.NewReader(body))
	if err != nil {
		return "", err
	}
	req.Header.Set("Authorization", "Bearer "+p.APIKey)
	req.Header.Set("Content-Type", "application/json")
	resp, err := p.HTTP.Do(req)
	if err != nil {
		return "", fmt.Errorf("paperclip: %w", err)
	}
	defer resp.Body.Close()
	if resp.StatusCode != http.StatusOK && resp.StatusCode != http.StatusCreated {
		return "", fmt.Errorf("paperclip: status %d", resp.StatusCode)
	}
	var out struct {
		Issue struct {
			ID string `json:"id"`
		} `json:"issue"`
		ID string `json:"id"`
	}
	if err := json.NewDecoder(resp.Body).Decode(&out); err != nil {
		return "", err
	}
	id := out.Issue.ID
	if id == "" {
		id = out.ID
	}
	if id == "" {
		return "", fmt.Errorf("paperclip: reply has no issue id")
	}
	return id, nil
}