package transitous

import (
	"context"
	"encoding/json"
	"fmt"
	"net/http"
	"net/url"
	"time"

	"github.com/rs/zerolog/log"
)

// Client represents a Transitous API client
type Client struct {
	baseURL    string
	httpClient *http.Client
}

// NewClient creates a new Transitous client
func NewClient(baseURL string) *Client {
	return &Client{
		baseURL: baseURL,
		httpClient: &http.Client{
			Timeout: 30 * time.Second,
		},
	}
}

// PlanParams represents the parameters for route planning
type PlanParams struct {
	FromPlace string
	ToPlace   string
	Time      *time.Time
}

// PlanResponse represents the response from the Transitous API
type PlanResponse struct {
	Itineraries []Itinerary `json:"itineraries"`
}

// PlanWithResponse plans a route and returns the response
func (c *Client) PlanWithResponse(ctx context.Context, params *PlanParams) (*TransitousResponse, error) {
	// Build URL with query parameters
	u, err := url.Parse(fmt.Sprintf("%s/api/v4/plan", c.baseURL))
	if err != nil {
		return nil, fmt.Errorf("failed to parse base URL: %w", err)
	}

	query := u.Query()
	query.Set("fromPlace", params.FromPlace)
	query.Set("toPlace", params.ToPlace)

	if params.Time != nil {
		// Use ISO 8601 format with timezone like in the example
		query.Set("time", params.Time.Format(time.RFC3339))
	}

	// Additional parameters matching the example
	query.Set("withFares", "true")
	query.Set("fastestDirectFactor", "1.5")
	query.Set("joinInterlinedLegs", "false")
	query.Set("maxMatchingDistance", "250")
	// query.Set("arriveBy", "true")

	u.RawQuery = query.Encode()

	// Create HTTP request
	req, err := http.NewRequestWithContext(ctx, "GET", u.String(), nil)
	if err != nil {
		return nil, fmt.Errorf("failed to create request: %w", err)
	}

	req.Header.Set("Accept", "application/json")
	req.Header.Set("User-Agent", "COOPGO-Platform/1.0")

	log.Debug().
		Str("url", u.String()).
		Msg("Making Transitous API request")

	// Execute request
	resp, err := c.httpClient.Do(req)
	if err != nil {
		return nil, fmt.Errorf("request failed: %w", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusOK {
		return nil, fmt.Errorf("API request failed with status %d", resp.StatusCode)
	}

	// Parse response
	var transitousResponse TransitousResponse
	if err := json.NewDecoder(resp.Body).Decode(&transitousResponse); err != nil {
		return nil, fmt.Errorf("failed to decode response: %w", err)
	}

	log.Debug().
		Str("from", params.FromPlace).
		Str("to", params.ToPlace).
		Int("itineraries", len(transitousResponse.Itineraries)).
		Msg("Transitous API response received")

	return &transitousResponse, nil
}