// +build integration

package serviceadapter

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

// TestIntegration tests the real gateway deployment.
// Run with: go test -tags integration -v ./internal/serviceadapter
func TestIntegration(t *testing.T) {
	// Load config from .dev.test
	gatewayURL := os.Getenv("GATEWAY_URL")
	if gatewayURL == "" {
		gatewayURL = "http://localhost:8080"
	}
	
	testJWT := os.Getenv("TEST_JWT_TOKEN")
	skipAuth := os.Getenv("SKIP_AUTH_TESTS") == "true"
	
	timeoutStr := os.Getenv("TEST_TIMEOUT")
	timeout := 10
	if t, err := strconv.Atoi(timeoutStr); err == nil {
		timeout = t
	}

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

	t.Run("health check", func(t *testing.T) {
		resp, err := client.Get(gatewayURL + "/healthz")
		if err != nil {
			t.Fatalf("health check failed: %v", err)
		}
		defer resp.Body.Close()

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

	t.Run("public service - sqs", 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", "sqs")
		req.Header.Set("X-Resource", "list-queues")

		resp, err := client.Do(req)
		if err != nil {
			t.Fatalf("request failed: %v", err)
		}
		defer resp.Body.Close()

		if resp.StatusCode == http.StatusBadGateway {
			t.Logf("sqs service not reachable (expected in test env): %d", resp.StatusCode)
			return // Service might not be reachable from outside cluster
		}

		if resp.StatusCode < 200 || resp.StatusCode >= 300 {
			body, _ := io.ReadAll(resp.Body)
			t.Logf("sqs returned %d: %s", resp.StatusCode, string(body))
		}
	})

	t.Run("public service - s3", 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")

		resp, err := client.Do(req)
		if err != nil {
			t.Fatalf("request failed: %v", err)
		}
		defer resp.Body.Close()

		if resp.StatusCode == http.StatusBadGateway {
			t.Logf("s3 service not reachable (expected in test env): %d", resp.StatusCode)
			return
		}

		if resp.StatusCode < 200 || resp.StatusCode >= 300 {
			body, _ := io.ReadAll(resp.Body)
			t.Logf("s3 returned %d: %s", resp.StatusCode, string(body))
		}
	})

	t.Run("public service - memory", func(t *testing.T) {
		req, err := http.NewRequest("POST", gatewayURL+"/", nil)
		if err != nil {
			t.Fatalf("failed to create request: %v", err)
		}
		req.Header.Set("X-Service", "memory")
		req.Header.Set("X-Resource", "query")

		resp, err := client.Do(req)
		if err != nil {
			t.Fatalf("request failed: %v", err)
		}
		defer resp.Body.Close()

		if resp.StatusCode == http.StatusBadGateway {
			t.Logf("memory service not reachable (expected in test env): %d", resp.StatusCode)
			return
		}

		if resp.StatusCode < 200 || resp.StatusCode >= 300 {
			body, _ := io.ReadAll(resp.Body)
			t.Logf("memory returned %d: %s", resp.StatusCode, string(body))
		}
	})

	t.Run("service not found", 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", "nonexistent")
		req.Header.Set("X-Resource", "foo")

		resp, err := client.Do(req)
		if err != nil {
			t.Fatalf("request failed: %v", err)
		}
		defer resp.Body.Close()

		if resp.StatusCode != http.StatusNotFound {
			t.Errorf("expected 404, got %d", resp.StatusCode)
		}

		body, _ := io.ReadAll(resp.Body)
		if !strings.Contains(string(body), "not found") {
			t.Errorf("expected 'not found' in response, got: %s", string(body))
		}
	})

	t.Run("resource not found", 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", "sqs")
		req.Header.Set("X-Resource", "invalid-resource")

		resp, err := client.Do(req)
		if err != nil {
			t.Fatalf("request failed: %v", err)
		}
		defer resp.Body.Close()

		if resp.StatusCode != http.StatusNotFound {
			t.Errorf("expected 404, got %d", resp.StatusCode)
		}
	})

	if !skipAuth && testJWT != "" {
		t.Run("iam service with valid JWT", 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", "iam")
			req.Header.Set("X-Resource", "list-roles")
			req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", testJWT))

			resp, err := client.Do(req)
			if err != nil {
				t.Fatalf("request failed: %v", err)
			}
			defer resp.Body.Close()

			if resp.StatusCode == http.StatusBadGateway {
				t.Logf("iam service not reachable: %d", resp.StatusCode)
				return
			}

			if resp.StatusCode >= 400 {
				body, _ := io.ReadAll(resp.Body)
				t.Logf("iam returned %d: %s", resp.StatusCode, string(body))
			}
		})
	} else {
		t.Log("Skipping auth tests (set TEST_JWT_TOKEN to enable)")
	}

	t.Run("missing X-Service header", func(t *testing.T) {
		req, err := http.NewRequest("GET", gatewayURL+"/", nil)
		if err != nil {
			t.Fatalf("failed to create request: %v", err)
		}
		// No X-Service header

		resp, err := client.Do(req)
		if err != nil {
			t.Fatalf("request failed: %v", err)
		}
		defer resp.Body.Close()

		// Should route through other paths, not via X-Service dispatcher
		// This is expected - no error, just not dispatched
		t.Logf("Request without X-Service returned %d", resp.StatusCode)
	})
}