package notice

import (
	"encoding/json"
	"fmt"
	"html"
	"strings"
)

type renderedRequest struct {
	URL  string `json:"url" dc:"最终请求地址"`
	Body []byte `json:"body" dc:"平台请求体"`
}

type renderer interface {
	Capabilities() Capabilities
	Render(config Config, message Message) (renderedRequest, error)
	ValidateResponse(response networkResponse) error
}

func marshalRequest(url string, body any) (renderedRequest, error) {
	data, err := json.Marshal(body)
	if err != nil {
		return renderedRequest{}, fmt.Errorf("notice: marshal webhook request: %w", err)
	}
	return renderedRequest{URL: url, Body: data}, nil
}

func validateHTTP(channel Channel, response networkResponse) error {
	if response.StatusCode < 200 || response.StatusCode >= 300 {
		return &HTTPError{Channel: channel, StatusCode: response.StatusCode, Body: string(response.Body)}
	}
	return nil
}

func cardMarkdown(card *CardContent) string {
	parts := make([]string, 0, 1+len(card.Fields))
	if strings.TrimSpace(card.Markdown) != "" {
		parts = append(parts, card.Markdown)
	}
	for _, field := range card.Fields {
		parts = append(parts, fmt.Sprintf("**%s：** %s", field.Name, field.Value))
	}
	return strings.Join(parts, "\n\n")
}

func cardMarkdownFallback(card *CardContent) string {
	content := cardMarkdown(card)
	if strings.TrimSpace(content) == "" {
		return card.Title
	}
	if strings.TrimSpace(card.Title) == "" {
		return content
	}
	return "## " + card.Title + "\n\n" + content
}

func plainTitle(title, fallback string) string {
	if strings.TrimSpace(title) == "" {
		return fallback
	}
	return title
}

func escapeText(value string) string {
	value = html.EscapeString(value)
	replacer := strings.NewReplacer("\\", "\\\\", "*", "\\*", "_", "\\_", "`", "\\`", "[", "\\[", "]", "\\]")
	return replacer.Replace(value)
}