// +build integration

package serviceadapter

import (
	"bytes"
	"encoding/json"
	"fmt"
	"io"
	"net/http"
	"os"
	"strconv"
	"strings"
	"testing"
	"time"
)

// TestRealIntegration tests that the gateway correctly routes requests to upstreams.
// Services may return 404/errors if paths don't match their actual API.
func TestRealIntegration(t *testing.T) {
	gatewayURL := os.Getenv("GATEWAY_URL")
	if gatewayURL == "" {
		gatewayURL = "http://localhost:8080"
	}

	authentikURL := os.Getenv("AUTHENTIK_URL")
	if authentikURL == "" {
		authentikURL = "https://authentik.riotpiao.com"
	}

	clientID := os.Getenv("AUTHENTIK_CLIENT_ID")
	clientSecret := os.Getenv("AUTHENTIK_CLIENT_SECRET")

	skipAuthTests := clientID == "" || clientSecret == ""

	timeoutStr := os.Getenv("TEST_TIMEOUT")
	timeout := 30
	if t, err := strconv.Atoi(timeoutStr); err == nil {
		timeout = t
	}

	client := &http.Client{Timeout: time.Duration(timeout) * time.Second}

	var jwtToken string

	if !skipAuthTests {
		t.Run("get JWT from Authentik", func(t *testing.T) {
			data := fmt.Sprintf("grant_type=client_credentials&client_id=%s&client_secret=%s&scope=openid",
				clientID, clientSecret)

			resp, err := http.Post(
				authentikURL+"/application/o/token/",
				"application/x-www-form-urlencoded",
				strings.NewReader(data),
			)
			if err != nil {
				t.Fatalf("failed to get token: %v", err)
			}
			defer resp.Body.Close()

			if resp.StatusCode != http.StatusOK {
				body, _ := io.ReadAll(resp.Body)
				t.Fatalf("token request failed (%d): %s", resp.StatusCode, string(body))
			}

			var tokenResp struct {
				AccessToken string `json:"access_token"`
			}
			if err := json.NewDecoder(resp.Body).Decode(&tokenResp); err != nil {
				t.Fatalf("failed to parse token response: %v", err)
			}

			jwtToken = tokenResp.AccessToken
			t.Logf("✅ Got JWT token")
		})
	}

	// Test that gateway routes and passes through Authorization header
	// Services may return 404 if paths don't exist, but that's OK
	// We're testing that the request reached the service, not that it succeeded

	t.Run("SQS routing", func(t *testing.T) {
		payload := map[string]interface{}{"queue": "test"}
		body, _ := json.Marshal(payload)

		req, err := http.NewRequest("POST", gatewayURL+"/", bytes.NewReader(body))
		if err != nil {
			t.Fatalf("failed to create request: %v", err)
		}
		req.Header.Set("X-Service", "sqs")
		req.Header.Set("X-Resource", "send-message")
		req.Header.Set("Content-Type", "application/json")

		resp, err := client.Do(req)
		if err != nil {
			t.Logf("SQS unreachable: %v", err)
			t.Skip()
		}
		defer resp.Body.Close()

		// Any response (even 404) means gateway routed it
		// 502/503 means service unreachable
		if resp.StatusCode >= 500 {
			t.Logf("SQS backend unreachable (%d)", resp.StatusCode)
			t.Skip()
		}

		t.Logf("✅ SQS routed: %d", resp.StatusCode)
	})

	t.Run("S3 routing", func(t *testing.T) {
		req, err := http.NewRequest("GET", gatewayURL+"/", nil)
		if err != nil {
			t.Fatalf("failed to create request: %v", err)
		}
		req.Header.Set("X-Service", "s3")
		req.Header.Set("X-Resource", "list-objects")

		if !skipAuthTests && jwtToken != "" {
			req.Header.Set("Authorization", "Bearer "+jwtToken)
			t.Logf("Testing with JWT")
		}

		resp, err := client.Do(req)
		if err != nil {
			t.Logf("MinIO unreachable: %v", err)
			t.Skip()
		}
		defer resp.Body.Close()

		if resp.StatusCode >= 500 {
			t.Logf("MinIO backend unreachable (%d)", resp.StatusCode)
			t.Skip()
		}

		t.Logf("✅ S3 routed: %d", resp.StatusCode)
	})

	t.Run("Memory routing", func(t *testing.T) {
		payload := map[string]interface{}{"query": "test"}
		body, _ := json.Marshal(payload)

		req, err := http.NewRequest("POST", gatewayURL+"/", bytes.NewReader(body))
		if err != nil {
			t.Fatalf("failed to create request: %v", err)
		}
		req.Header.Set("X-Service", "memory")
		req.Header.Set("X-Resource", "query")
		req.Header.Set("Content-Type", "application/json")

		resp, err := client.Do(req)
		if err != nil {
			t.Logf("Memory unreachable: %v", err)
			t.Skip()
		}
		defer resp.Body.Close()

		if resp.StatusCode >= 500 {
			t.Logf("Memory backend unreachable (%d)", resp.StatusCode)
			t.Skip()
		}

		t.Logf("✅ Memory routed: %d", resp.StatusCode)
	})

	t.Run("IAM routing with JWT", func(t *testing.T) {
		if skipAuthTests {
			t.Skip("No JWT token")
		}

		req, err := http.NewRequest("GET", gatewayURL+"/", nil)
		if err != nil {
			t.Fatalf("failed to create request: %v", err)
		}
		req.Header.Set("X-Service", "iam")
		req.Header.Set("X-Resource", "list-roles")
		req.Header.Set("Authorization", "Bearer "+jwtToken)

		resp, err := client.Do(req)
		if err != nil {
			t.Logf("Authentik unreachable: %v", err)
			t.Skip()
		}
		defer resp.Body.Close()

		if resp.StatusCode >= 500 {
			t.Logf("Authentik backend unreachable (%d)", resp.StatusCode)
			t.Skip()
		}

		t.Logf("✅ IAM routed: %d", resp.StatusCode)
	})

	t.Run("Authorization header pass-through", func(t *testing.T) {
		testToken := "Bearer test-token-xyz"

		req, err := http.NewRequest("GET", gatewayURL+"/", nil)
		if err != nil {
			t.Fatalf("failed to create request: %v", err)
		}
		req.Header.Set("X-Service", "s3")
		req.Header.Set("X-Resource", "list-objects")
		req.Header.Set("Authorization", testToken)

		resp, err := client.Do(req)
		if err != nil {
			t.Logf("S3 unreachable: %v", err)
			t.Skip()
		}
		defer resp.Body.Close()

		// Gateway passed the request through
		// MinIO responded (even with error)
		t.Logf("✅ Authorization header passed through: %d", resp.StatusCode)
	})
}