package irontelemetry

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

// Transport handles HTTP communication with the server
type Transport struct {
	apiBaseURL string
	publicKey  string
	debug      bool
	client     *http.Client
}

// NewTransport creates a new Transport
func NewTransport(parsedDSN *ParsedDSN, apiBaseURL string, debug bool) *Transport {
	return &Transport{
		apiBaseURL: apiBaseURL,
		publicKey:  parsedDSN.PublicKey,
		debug:      debug,
		client: &http.Client{
			Timeout: 30 * time.Second,
		},
	}
}

// Send sends an event to the server
func (t *Transport) Send(ctx context.Context, event *TelemetryEvent) SendResult {
	url := t.apiBaseURL + "/api/v1/events"

	body, err := json.Marshal(t.serializeEvent(event))
	if err != nil {
		return SendResult{Success: false, Error: err.Error()}
	}

	req, err := http.NewRequestWithContext(ctx, "POST", url, bytes.NewReader(body))
	if err != nil {
		return SendResult{Success: false, Error: err.Error()}
	}

	req.Header.Set("Content-Type", "application/json")
	req.Header.Set("X-Public-Key", t.publicKey)

	resp, err := t.client.Do(req)
	if err != nil {
		if t.debug {
			fmt.Printf("[IronTelemetry] Failed to send event: %v\n", err)
		}
		return SendResult{Success: false, Error: err.Error()}
	}
	defer resp.Body.Close()

	if resp.StatusCode >= 400 {
		bodyBytes, _ := io.ReadAll(resp.Body)
		errMsg := fmt.Sprintf("HTTP %d: %s", resp.StatusCode, string(bodyBytes))
		if t.debug {
			fmt.Printf("[IronTelemetry] Failed to send event: %s\n", errMsg)
		}
		return SendResult{Success: false, Error: errMsg}
	}

	var result struct {
		EventID string `json:"eventId"`
	}
	if err := json.NewDecoder(resp.Body).Decode(&result); err != nil {
		// Even if we can't decode, the request succeeded
		result.EventID = event.EventID
	}

	if t.debug {
		fmt.Printf("[IronTelemetry] Event sent successfully: %s\n", event.EventID)
	}

	return SendResult{
		Success: true,
		EventID: result.EventID,
	}
}

// IsOnline checks if the server is reachable
func (t *Transport) IsOnline(ctx context.Context) bool {
	url := t.apiBaseURL + "/api/v1/health"

	req, err := http.NewRequestWithContext(ctx, "GET", url, nil)
	if err != nil {
		return false
	}

	req.Header.Set("X-Public-Key", t.publicKey)

	resp, err := t.client.Do(req)
	if err != nil {
		return false
	}
	defer resp.Body.Close()

	return resp.StatusCode == 200
}

func (t *Transport) serializeEvent(event *TelemetryEvent) map[string]any {
	breadcrumbs := make([]map[string]any, len(event.Breadcrumbs))
	for i, b := range event.Breadcrumbs {
		breadcrumbs[i] = map[string]any{
			"timestamp": b.Timestamp.Format(time.RFC3339),
			"category":  b.Category,
			"message":   b.Message,
			"level":     b.Level,
			"data":      b.Data,
		}
	}

	result := map[string]any{
		"eventId":     event.EventID,
		"timestamp":   event.Timestamp.Format(time.RFC3339),
		"level":       event.Level,
		"message":     event.Message,
		"tags":        event.Tags,
		"extra":       event.Extra,
		"breadcrumbs": breadcrumbs,
		"environment": event.Environment,
		"appVersion":  event.AppVersion,
		"platform": map[string]any{
			"name":    event.Platform.Name,
			"version": event.Platform.Version,
			"os":      event.Platform.OS,
		},
	}

	if event.Exception != nil {
		stacktrace := make([]map[string]any, len(event.Exception.Stacktrace))
		for i, f := range event.Exception.Stacktrace {
			stacktrace[i] = map[string]any{
				"function": f.Function,
				"filename": f.Filename,
				"lineno":   f.Lineno,
			}
		}
		result["exception"] = map[string]any{
			"type":       event.Exception.Type,
			"message":    event.Exception.Message,
			"stacktrace": stacktrace,
		}
	}

	if event.User != nil {
		result["user"] = map[string]any{
			"id":    event.User.ID,
			"email": event.User.Email,
			"name":  event.User.Name,
			"data":  event.User.Data,
		}
	}

	if event.Journey != nil {
		result["journey"] = map[string]any{
			"journeyId":   event.Journey.JourneyID,
			"name":        event.Journey.Name,
			"currentStep": event.Journey.CurrentStep,
			"startedAt":   event.Journey.StartedAt.Format(time.RFC3339),
			"metadata":    event.Journey.Metadata,
		}
	}

	return result
}