package api

import (
	"context"
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"testing"

	"browser.local/run/protocol"
)

func TestPlatformClientArtifactMethodsPostJSONAndDecodeResponses(t *testing.T) {
	seen := map[string]bool{}
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		seen[r.URL.Path] = true
		switch r.URL.Path {
		case "/api/v1/run/artifacts/open":
			var request protocol.ArtifactTransferOpenRequest
			decodeTestRequest(t, r, &request)
			if request.ArtifactID != "artifact-1" || request.ChunkSizeBytes != 8 {
				t.Fatalf("unexpected artifact open request: %+v", request)
			}
			writeTestJSON(t, w, validArtifactOpenResponse())
		case "/api/v1/run/artifacts/chunks":
			var request protocol.ArtifactChunkUploadRequest
			decodeTestRequest(t, r, &request)
			if request.TransferID != "transfer-1" || request.ChunkIndex != 0 || string(request.Payload) != "payload" {
				t.Fatalf("unexpected artifact chunk request: %+v", request)
			}
			writeTestJSON(t, w, protocol.ArtifactChunkUploadResponse{Accepted: true, TransferID: "transfer-1", ArtifactID: "artifact-1", ChunkIndex: 0, ReceivedChunkIndexes: []int{0}, NextMissingChunkIndex: 1, ServerTime: fixedClientTestTime()})
		case "/api/v1/run/artifacts/status":
			var request protocol.ArtifactTransferStatusRequest
			decodeTestRequest(t, r, &request)
			if request.TransferID != "transfer-1" {
				t.Fatalf("unexpected artifact status request: %+v", request)
			}
			writeTestJSON(t, w, protocol.ArtifactTransferStatusResponse{Accepted: true, TransferID: "transfer-1", ArtifactID: "artifact-1", Direction: "upload", TotalChunks: 2, ChunkSizeBytes: 8, ReceivedChunkIndexes: []int{0}, NextMissingChunkIndex: 1, ServerTime: fixedClientTestTime()})
		case "/api/v1/run/artifacts/complete":
			var request protocol.ArtifactTransferCompleteRequest
			decodeTestRequest(t, r, &request)
			if request.Checksum == "" || request.SizeBytes != 7 {
				t.Fatalf("unexpected artifact complete request: %+v", request)
			}
			response := protocol.ArtifactTransferCompleteResponse{Accepted: true, TransferID: "transfer-1", Artifact: validArtifactMetadata("available"), Completed: true, ServerTime: fixedClientTestTime()}
			writeTestJSON(t, w, response)
		default:
			t.Fatalf("unexpected request path %s", r.URL.Path)
		}
	}))
	defer server.Close()

	client, err := NewPlatformClient(server.URL)
	if err != nil {
		t.Fatalf("new client: %v", err)
	}
	ctx := context.Background()
	open, err := client.OpenArtifactTransfer(ctx, validClientArtifactOpen())
	if err != nil || !open.Accepted || open.TransferID != "transfer-1" {
		t.Fatalf("open artifact response=%+v err=%v", open, err)
	}
	chunk, err := client.UploadArtifactChunk(ctx, validClientArtifactChunk())
	if err != nil || chunk.NextMissingChunkIndex != 1 {
		t.Fatalf("upload artifact chunk response=%+v err=%v", chunk, err)
	}
	status, err := client.QueryArtifactTransferStatus(ctx, validClientArtifactStatus())
	if err != nil || len(status.ReceivedChunkIndexes) != 1 {
		t.Fatalf("artifact status response=%+v err=%v", status, err)
	}
	complete, err := client.CompleteArtifactTransfer(ctx, validClientArtifactComplete())
	if err != nil || !complete.Completed || complete.Artifact.State != "available" {
		t.Fatalf("complete artifact response=%+v err=%v", complete, err)
	}

	for _, path := range []string{"/api/v1/run/artifacts/open", "/api/v1/run/artifacts/chunks", "/api/v1/run/artifacts/status", "/api/v1/run/artifacts/complete"} {
		if !seen[path] {
			t.Fatalf("expected request to %s", path)
		}
	}
}

func TestPlatformClientArtifactMethodReturnsErrorForPlatformFailure(t *testing.T) {
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.WriteHeader(http.StatusBadRequest)
		_, _ = w.Write([]byte(`{"code":"validation_failed"}`))
	}))
	defer server.Close()

	client, err := NewPlatformClient(server.URL)
	if err != nil {
		t.Fatalf("new client: %v", err)
	}
	if _, err := client.OpenArtifactTransfer(context.Background(), validClientArtifactOpen()); err == nil {
		t.Fatal("expected platform error")
	}
}

func TestArtifactChunkPayloadUsesJSONBase64Encoding(t *testing.T) {
	encoded, err := json.Marshal(validClientArtifactChunk())
	if err != nil {
		t.Fatalf("marshal artifact chunk: %v", err)
	}
	if !json.Valid(encoded) || !containsJSONPayloadField(encoded) {
		t.Fatalf("expected JSON encoded payload field, got %s", string(encoded))
	}
}

func validClientArtifactOpen() protocol.ArtifactTransferOpenRequest {
	return protocol.ArtifactTransferOpenRequest{
		RunEndpointID:  "run-local",
		SessionToken:   "session-token",
		ArtifactID:     "artifact-1",
		Direction:      "upload",
		OwnerKind:      "job",
		OwnerID:        "job-1",
		SizeBytes:      7,
		ChunkSizeBytes: 8,
		Checksum:       validSHA256Checksum(),
		IdempotencyKey: "artifact-upload-1",
	}
}

func validClientArtifactChunk() protocol.ArtifactChunkUploadRequest {
	return protocol.ArtifactChunkUploadRequest{RunEndpointID: "run-local", SessionToken: "session-token", TransferID: "transfer-1", ArtifactID: "artifact-1", ChunkIndex: 0, Offset: 0, SizeBytes: 7, Checksum: validSHA256Checksum(), Payload: []byte("payload")}
}

func validClientArtifactStatus() protocol.ArtifactTransferStatusRequest {
	return protocol.ArtifactTransferStatusRequest{RunEndpointID: "run-local", SessionToken: "session-token", TransferID: "transfer-1", ArtifactID: "artifact-1"}
}

func validClientArtifactComplete() protocol.ArtifactTransferCompleteRequest {
	return protocol.ArtifactTransferCompleteRequest{RunEndpointID: "run-local", SessionToken: "session-token", TransferID: "transfer-1", ArtifactID: "artifact-1", Checksum: validSHA256Checksum(), SizeBytes: 7}
}

func validArtifactOpenResponse() protocol.ArtifactTransferOpenResponse {
	return protocol.ArtifactTransferOpenResponse{Accepted: true, TransferID: "transfer-1", Direction: "upload", Artifact: validArtifactMetadata("uploading"), TotalChunks: 2, ChunkSizeBytes: 8, NextMissingChunkIndex: 0, ServerTime: fixedClientTestTime()}
}

func validArtifactMetadata(state string) protocol.ArtifactMetadata {
	return protocol.ArtifactMetadata{ID: "artifact-1", OwnerKind: "job", OwnerID: "job-1", SizeBytes: 7, Checksum: validSHA256Checksum(), State: state, CreatedAt: fixedClientTestTime(), UpdatedAt: fixedClientTestTime()}
}

func validSHA256Checksum() string {
	return "sha256:0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef"
}

func containsJSONPayloadField(encoded []byte) bool {
	var body map[string]any
	if err := json.Unmarshal(encoded, &body); err != nil {
		return false
	}
	_, exists := body["payload"]
	return exists
}