package websearch

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

type bingSearchResponse struct {
	WebPages *struct {
		Value []struct {
			Name    string `json:"name"`
			URL     string `json:"url"`
			Snippet string `json:"snippet"`
		} `json:"value"`
	} `json:"webPages"`
}

func (c *Client) searchBing(ctx context.Context, provider Provider, query string, count int) ([]Result, error) {
	apiKey := strings.TrimSpace(provider.APIKey)
	if apiKey == "" {
		return nil, fmt.Errorf("bing api key is required")
	}

	endpoint := strings.TrimSpace(provider.BaseURL)
	if endpoint == "" {
		endpoint = bingSearchURL
	}
	u, err := url.Parse(endpoint)
	if err != nil {
		return nil, err
	}
	q := u.Query()
	q.Set(queryParamName(provider), query)
	q.Set("count", fmt.Sprintf("%d", count))
	u.RawQuery = q.Encode()

	req, err := http.NewRequestWithContext(ctx, http.MethodGet, u.String(), nil)
	if err != nil {
		return nil, err
	}
	req.Header.Set("Accept", "application/json")
	header := strings.TrimSpace(provider.AuthHeader)
	if header == "" {
		header = "Ocp-Apim-Subscription-Key"
	}
	req.Header.Set(header, apiKey)

	body, status, err := c.doRequest(req)
	if err != nil {
		return nil, err
	}
	if status >= 400 {
		return nil, fmt.Errorf("bing search failed (%d): %s", status, string(body))
	}

	var parsed bingSearchResponse
	if err := json.Unmarshal(body, &parsed); err != nil {
		return nil, err
	}
	if parsed.WebPages == nil || len(parsed.WebPages.Value) == 0 {
		return []Result{}, nil
	}

	results := make([]Result, 0, len(parsed.WebPages.Value))
	for _, item := range parsed.WebPages.Value {
		results = append(results, Result{
			Title:       strings.TrimSpace(item.Name),
			URL:         strings.TrimSpace(item.URL),
			Description: strings.TrimSpace(item.Snippet),
		})
	}
	if len(results) > count {
		results = results[:count]
	}
	return results, nil
}