package httpapi

import (
	"context"
	"encoding/base64"
	"io"
	"log/slog"
	"net/http"
	"net/http/httptest"
	"os"
	"path/filepath"
	"testing"
	"time"

	"github.com/easyai/easyai-ai-gateway/apps/api/internal/config"
)

func TestRequestAssetFromValueDetectsDataURLAndRawBase64(t *testing.T) {
	payload := base64.StdEncoding.EncodeToString([]byte("inline image"))
	decoded, ok, err := requestAssetFromValue("url", []string{"messages", "[0]", "content", "[1]", "image_url"}, "data:image/png;base64,"+payload, nil)
	if err != nil {
		t.Fatalf("decode data URL: %v", err)
	}
	if !ok || decoded.ContentType != "image/png" || string(decoded.Bytes) != "inline image" {
		t.Fatalf("unexpected data URL asset: ok=%v decoded=%+v", ok, decoded)
	}

	audio := base64.StdEncoding.EncodeToString([]byte("inline audio"))
	decoded, ok, err = requestAssetFromValue("data", []string{"input_audio"}, audio, map[string]any{"format": "mp3"})
	if err != nil {
		t.Fatalf("decode raw audio: %v", err)
	}
	if !ok || decoded.ContentType != "audio/mpeg" || string(decoded.Bytes) != "inline audio" {
		t.Fatalf("unexpected raw audio asset: ok=%v decoded=%+v", ok, decoded)
	}
}

func TestCanonicalConversationMessageHashUsesTextAndAssetRefs(t *testing.T) {
	message := map[string]any{
		"role": "user",
		"content": []any{
			map[string]any{"type": "text", "text": "describe it"},
			map[string]any{"type": "image_url", "image_url": map[string]any{
				"url":      "https://cdn.example/a.png",
				"assetRef": map[string]any{"sha256": "sha-a", "url": "https://cdn.example/a.png"},
			}},
		},
	}
	sameMessage := map[string]any{
		"role": "user",
		"content": []any{
			map[string]any{"type": "text", "text": "describe it"},
			map[string]any{"type": "image_url", "image_url": map[string]any{
				"url":      "https://different.example/a.png",
				"assetRef": map[string]any{"sha256": "sha-a", "url": "https://different.example/a.png"},
			}},
		},
	}
	changedMessage := map[string]any{
		"role":    "user",
		"content": "describe something else",
	}

	firstHash, assetHashes := canonicalConversationMessageHash(message)
	secondHash, _ := canonicalConversationMessageHash(sameMessage)
	changedHash, _ := canonicalConversationMessageHash(changedMessage)
	if firstHash != secondHash {
		t.Fatalf("message hash should ignore resource URL drift when asset sha is stable")
	}
	if firstHash == changedHash {
		t.Fatalf("message hash should change when text changes")
	}
	if len(assetHashes) != 1 || assetHashes[0] != "sha-a" {
		t.Fatalf("unexpected asset hashes: %+v", assetHashes)
	}
}

func TestCleanupExpiredLocalTempAssetsDeletesExpiredStaticFiles(t *testing.T) {
	uploadedDir := t.TempDir()
	generatedDir := t.TempDir()
	oldUploaded := filepath.Join(uploadedDir, requestAssetFilePrefix+"old.png")
	freshUploaded := filepath.Join(uploadedDir, requestAssetFilePrefix+"fresh.png")
	oldGenerated := filepath.Join(generatedDir, "gateway-result-old.png")
	freshGenerated := filepath.Join(generatedDir, "gateway-result-fresh.png")
	for _, path := range []string{oldUploaded, freshUploaded, oldGenerated, freshGenerated} {
		if err := os.WriteFile(path, []byte("asset"), 0o644); err != nil {
			t.Fatalf("write fixture %s: %v", path, err)
		}
	}
	now := time.Now()
	for _, path := range []string{oldUploaded, oldGenerated} {
		if err := os.Chtimes(path, now.Add(-25*time.Hour), now.Add(-25*time.Hour)); err != nil {
			t.Fatalf("touch old static asset %s: %v", path, err)
		}
	}
	for _, path := range []string{freshUploaded, freshGenerated} {
		if err := os.Chtimes(path, now.Add(-23*time.Hour), now.Add(-23*time.Hour)); err != nil {
			t.Fatalf("touch fresh static asset %s: %v", path, err)
		}
	}
	server := &Server{
		cfg: config.Config{
			LocalGeneratedStorageDir: generatedDir,
			LocalUploadedStorageDir:  uploadedDir,
			LocalTempAssetTTLHours:   24,
		},
		logger: slog.New(slog.NewTextHandler(io.Discard, nil)),
	}

	deleted := server.cleanupExpiredLocalTempAssets(context.Background(), now)

	if deleted != 2 {
		t.Fatalf("expected two expired static asset deletes, got %d", deleted)
	}
	for _, path := range []string{oldUploaded, oldGenerated} {
		if _, err := os.Stat(path); !os.IsNotExist(err) {
			t.Fatalf("old static asset should be deleted %s, stat err=%v", path, err)
		}
	}
	for _, path := range []string{freshUploaded, freshGenerated} {
		if _, err := os.Stat(path); err != nil {
			t.Fatalf("fresh static asset should remain %s: %v", path, err)
		}
	}
}

func TestRequestConversationKeyPriority(t *testing.T) {
	request := httptest.NewRequest(http.MethodPost, "/api/v1/chat/completions", nil)
	request.Header.Set("X-EasyAI-Conversation-ID", "from-header")
	body := map[string]any{
		"conversation_id": "from-body",
		"metadata":        map[string]any{"conversation_id": "from-metadata"},
	}
	if got := requestConversationKey(request, body); got != "from-header" {
		t.Fatalf("expected header conversation id, got %q", got)
	}
	request.Header.Del("X-EasyAI-Conversation-ID")
	if got := requestConversationKey(request, body); got != "from-body" {
		t.Fatalf("expected body conversation id, got %q", got)
	}
	delete(body, "conversation_id")
	if got := requestConversationKey(request, body); got != "from-metadata" {
		t.Fatalf("expected metadata conversation id, got %q", got)
	}
}