// Copyright 2026 Alibaba Group
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package helpers

import (
	"bytes"
	"context"
	"encoding/json"
	"os"
	"path/filepath"
	"strings"
	"testing"
	"time"
)

func writeQoderStreamStub(t *testing.T, dir string) (string, string) {
	t.Helper()
	requirePOSIXShell(t)
	logPath := filepath.Join(dir, "qoder-starts.log")
	script := `import json
import os
import sys

with open(os.environ["DWS_QODER_STUB_LOG"], "a", encoding="utf-8") as f:
    f.write("START " + json.dumps(sys.argv[1:], ensure_ascii=False) + "\n")

if "--input-format" in sys.argv:
    for raw in sys.stdin:
        raw = raw.strip()
        if not raw:
            continue
        msg = json.loads(raw)
        if msg.get("type") == "control_request":
            rid = msg.get("request_id", "")
            print(json.dumps({
                "type": "control_response",
                "response": {
                    "subtype": "success",
                    "request_id": rid,
                    "response": {"agents": []},
                },
            }), flush=True)
            continue
        if msg.get("type") == "user":
            content = msg.get("message", {}).get("content", "")
            print(json.dumps({
                "type": "assistant",
                "message": {"content": [{"type": "text", "text": "seen " + content}]},
            }), flush=True)
            print(json.dumps({
                "type": "result",
                "subtype": "success",
                "message": {"content": [{"type": "text", "text": "done " + content}]},
            }), flush=True)
else:
    prompt = sys.argv[-1] if len(sys.argv) > 1 else ""
    print("one-shot " + prompt)
`
	pythonPath := filepath.Join(dir, "qoder-stub.py")
	if err := os.WriteFile(pythonPath, []byte(script), 0o600); err != nil {
		t.Fatalf("write qoder stub: %v", err)
	}
	t.Setenv("DWS_QODER_PY_STUB", filepath.ToSlash(pythonPath))
	bin := writeShellExecutable(t, dir, "qodercli", `exec python3 "$DWS_QODER_PY_STUB" "$@"`+"\n")
	return bin, logPath
}

func TestQoderForwarderUsesNativeAttachmentFlag(t *testing.T) {
	t.Setenv("DWS_CONFIG_DIR", t.TempDir())
	stubDir := t.TempDir()
	bin, logPath := writeQoderStreamStub(t, stubDir)
	t.Setenv("DWS_QODER_STUB_LOG", logPath)
	attachmentPath := filepath.Join(t.TempDir(), "forwarded.mov")
	if err := os.WriteFile(attachmentPath, []byte("video-bytes"), 0o600); err != nil {
		t.Fatal(err)
	}
	f := &qoderStreamForwarder{
		name: "qoderwork", bin: bin,
		timeout: 5 * time.Second, sessions: newConvSessions(""),
	}
	reply, err := f.forwardWithAttachments(context.Background(), "conv", "分析视频", []connectMediaAttachment{{LocalPath: attachmentPath, FileName: "forwarded.mov", MediaType: "video"}})
	if err != nil {
		t.Fatal(err)
	}
	if reply != "one-shot 分析视频" {
		t.Fatalf("reply = %q", reply)
	}
	raw, err := os.ReadFile(logPath)
	if err != nil {
		t.Fatal(err)
	}
	encodedAttachmentPath, err := json.Marshal(attachmentPath)
	if err != nil {
		t.Fatal(err)
	}
	if !strings.Contains(string(raw), `"--attachment", `+string(encodedAttachmentPath)) || !strings.Contains(string(raw), `"-p", "分析视频"`) {
		t.Fatalf("qoder args missing attachment: %s", raw)
	}
}

func TestQoderForwarderKeepsStreamJSONProcessAlive(t *testing.T) {
	t.Setenv("DWS_CONNECT_NO_INSTALL", "1")
	t.Setenv("DWS_AGENT_CMD", "")
	t.Setenv("DWS_CONFIG_DIR", t.TempDir())
	t.Setenv("DWS_AGENT_TIMEOUT_MS", "3000")
	stubDir := t.TempDir()
	_, logPath := writeQoderStreamStub(t, stubDir)
	t.Setenv("PATH", stubDir+string(os.PathListSeparator)+os.Getenv("PATH"))
	t.Setenv("DWS_QODER_STUB_LOG", logPath)

	fwd, err := forwarderForChannel("qoder", "qoder-client", connectAgentOptions{Memory: true})
	if err != nil {
		t.Fatalf("forwarderForChannel(qoder): %v", err)
	}
	if closer, ok := fwd.(forwarderCloser); ok {
		defer closer.close()
	}
	sf, ok := fwd.(streamingForwarder)
	if !ok || !sf.canStream() {
		t.Fatalf("qoder forwarder should support streaming, got %T", fwd)
	}

	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()
	got1, err := sf.forwardStream(ctx, "conv-a", "first", func(string) {})
	if err != nil {
		t.Fatalf("first forward: %v", err)
	}
	got2, err := sf.forwardStream(ctx, "conv-a", "second", func(string) {})
	if err != nil {
		t.Fatalf("second forward: %v", err)
	}
	if got1 != "done first" || got2 != "done second" {
		t.Fatalf("replies = %q / %q, want done first / done second", got1, got2)
	}

	raw, err := os.ReadFile(logPath)
	if err != nil {
		t.Fatalf("read qoder stub log: %v", err)
	}
	lines := strings.Split(strings.TrimSpace(string(raw)), "\n")
	if len(lines) != 1 {
		t.Fatalf("qodercli starts = %d, want 1; log:\n%s", len(lines), raw)
	}
	if !strings.Contains(lines[0], "--input-format") || !strings.Contains(lines[0], "stream-json") {
		t.Fatalf("qodercli should start in stream-json input mode, log:\n%s", raw)
	}
}

type qoderTestWriteCloser struct {
	bytes.Buffer
}

func (w *qoderTestWriteCloser) Close() error { return nil }

func TestQoderControlRequestReturnsImmediately(t *testing.T) {
	stdin := &qoderTestWriteCloser{}
	f := &qoderStreamForwarder{name: "qoder", stdin: stdin}

	if !f.handleControlRequestLocked(`{"type":"control_request","request_id":"req-1","request":{"type":"permission","subtype":"permission","tool":"bash"}}`) {
		t.Fatal("control_request was not handled")
	}

	var got struct {
		Type     string `json:"type"`
		Response struct {
			Subtype   string `json:"subtype"`
			RequestID string `json:"request_id"`
			Code      string `json:"code"`
		} `json:"response"`
	}
	if err := json.Unmarshal(bytes.TrimSpace(stdin.Bytes()), &got); err != nil {
		t.Fatalf("decode response: %v; raw=%q", err, stdin.String())
	}
	if got.Type != "control_response" || got.Response.RequestID != "req-1" {
		t.Fatalf("response identity mismatch: %#v", got)
	}
	if got.Response.Subtype != "error" || got.Response.Code != "unsupported_control_request" {
		t.Fatalf("response should explicitly unblock with unsupported error: %#v", got.Response)
	}
}

func TestParseQoderPersistentLineReadsResultField(t *testing.T) {
	delta, final, done := parseQoderPersistentLine(`{"type":"result","subtype":"success","result":"OK"}`)
	if delta != "" || final != "OK" || !done {
		t.Fatalf("delta=%q final=%q done=%v, want final OK done", delta, final, done)
	}
}