package executor

import (
	"context"
	"fmt"
	"io"
	"log/slog"
	"os"
	"os/exec"
	"strings"
	"testing"

	"github.com/thepeterstone/claudomator/internal/storage"
	"github.com/thepeterstone/claudomator/internal/task"
)

func TestContainerRunner_BuildDockerArgs(t *testing.T) {
	runner := &ContainerRunner{
		APIURL:      "http://localhost:8484",
		DropsDir:    "/data/drops",
		SSHAuthSock: "/tmp/ssh.sock",
	}
	workspace := "/tmp/ws"
	taskID := "task-123"

	agentHome := "/tmp/ws/.agent-home"
	args := runner.buildDockerArgs(workspace, agentHome, taskID)

	expected := []string{
		"run", "--rm",
		"--add-host=host.docker.internal:host-gateway",
		fmt.Sprintf("--user=%d:%d", os.Getuid(), os.Getgid()),
		"-v", "/tmp/ws:/workspace",
		"-v", "/tmp/ws/.agent-home:/home/agent",
		"-w", "/workspace",
		"--env-file", "/tmp/ws/.claudomator-env",
		"-e", "HOME=/home/agent",
		"-e", "CLAUDOMATOR_API_URL=http://host.docker.internal:8484",
		"-e", "CLAUDOMATOR_TASK_ID=task-123",
		"-e", "CLAUDOMATOR_DROP_DIR=/data/drops",
		"-v", "/tmp/ssh.sock:/tmp/ssh-auth.sock",
		"-e", "SSH_AUTH_SOCK=/tmp/ssh-auth.sock",
	}

	if len(args) != len(expected) {
		t.Fatalf("expected %d args, got %d. Got: %v", len(expected), len(args), args)
	}
	for i, v := range args {
		if v != expected[i] {
			t.Errorf("arg %d: expected %q, got %q", i, expected[i], v)
		}
	}
}

func TestContainerRunner_BuildInnerCmd(t *testing.T) {
	runner := &ContainerRunner{}
	
	t.Run("claude-fresh", func(t *testing.T) {
		tk := &task.Task{Agent: task.AgentConfig{Type: "claude"}}
		exec := &storage.Execution{}
		cmd := runner.buildInnerCmd(tk, exec, false)
		
		cmdStr := strings.Join(cmd, " ")
		if strings.Contains(cmdStr, "--resume") {
			t.Errorf("unexpected --resume flag in fresh run: %q", cmdStr)
		}
		if !strings.Contains(cmdStr, "INST=$(cat /workspace/.claudomator-instructions.txt); claude -p \"$INST\"") {
			t.Errorf("expected cat instructions in sh command, got %q", cmdStr)
		}
	})

	t.Run("claude-resume", func(t *testing.T) {
		tk := &task.Task{Agent: task.AgentConfig{Type: "claude"}}
		exec := &storage.Execution{ResumeSessionID: "orig-session-123"}
		cmd := runner.buildInnerCmd(tk, exec, true)
		
		cmdStr := strings.Join(cmd, " ")
		if !strings.Contains(cmdStr, "--resume orig-session-123") {
			t.Errorf("expected --resume flag with correct session ID, got %q", cmdStr)
		}
	})

	t.Run("gemini", func(t *testing.T) {
		tk := &task.Task{Agent: task.AgentConfig{Type: "gemini"}}
		exec := &storage.Execution{}
		cmd := runner.buildInnerCmd(tk, exec, false)

		cmdStr := strings.Join(cmd, " ")
		if !strings.Contains(cmdStr, "gemini -p \"$INST\"") {
			t.Errorf("expected gemini command with safer quoting, got %q", cmdStr)
		}
	})

	t.Run("custom-binaries", func(t *testing.T) {
		runnerCustom := &ContainerRunner{
			ClaudeBinary: "/usr/bin/claude-v2",
			GeminiBinary: "/usr/local/bin/gemini-pro",
		}
		
		tkClaude := &task.Task{Agent: task.AgentConfig{Type: "claude"}}
		cmdClaude := runnerCustom.buildInnerCmd(tkClaude, &storage.Execution{}, false)
		if !strings.Contains(strings.Join(cmdClaude, " "), "/usr/bin/claude-v2 -p") {
			t.Errorf("expected custom claude binary, got %q", cmdClaude)
		}

		tkGemini := &task.Task{Agent: task.AgentConfig{Type: "gemini"}}
		cmdGemini := runnerCustom.buildInnerCmd(tkGemini, &storage.Execution{}, false)
		if !strings.Contains(strings.Join(cmdGemini, " "), "/usr/local/bin/gemini-pro -p") {
			t.Errorf("expected custom gemini binary, got %q", cmdGemini)
		}
	})
}

func TestContainerRunner_Run_PreservesWorkspaceOnFailure(t *testing.T) {
	logger := slog.New(slog.NewTextHandler(io.Discard, nil))
	runner := &ContainerRunner{
		Logger: logger,
		Image:  "busybox",
		Command: func(ctx context.Context, name string, arg ...string) *exec.Cmd {
			// Mock docker run to exit 1
			if name == "docker" {
				return exec.Command("sh", "-c", "exit 1")
			}
			// Mock git clone to succeed and create the directory
			if name == "git" && len(arg) > 0 && arg[0] == "clone" {
				dir := arg[len(arg)-1]
				os.MkdirAll(dir, 0755)
				return exec.Command("true")
			}
			return exec.Command("true")
		},
	}

	tk := &task.Task{
		ID:            "test-task",
		RepositoryURL: "https://github.com/example/repo.git",
		Agent:         task.AgentConfig{Type: "claude"},
	}
	exec := &storage.Execution{ID: "test-exec", TaskID: "test-task"}

	err := runner.Run(context.Background(), tk, exec)
	if err == nil {
		t.Fatal("expected error due to mocked docker failure")
	}

	// Verify SandboxDir was set and directory exists.
	if exec.SandboxDir == "" {
		t.Fatal("expected SandboxDir to be set even on failure")
	}
	if _, statErr := os.Stat(exec.SandboxDir); statErr != nil {
		t.Errorf("expected sandbox directory to be preserved, but stat failed: %v", statErr)
	} else {
		os.RemoveAll(exec.SandboxDir)
	}
}

func TestBlockedError_IncludesSandboxDir(t *testing.T) {
	// This test requires mocking 'docker run' or the whole Run() which is hard.
	// But we can test that returning BlockedError works.
	err := &BlockedError{
		QuestionJSON: `{"text":"?"}`,
		SessionID:    "s1",
		SandboxDir:   "/tmp/s1",
	}
	if !strings.Contains(err.Error(), "task blocked") {
		t.Errorf("wrong error message: %v", err)
	}
}

func TestIsCompletionReport(t *testing.T) {
	tests := []struct {
		name     string
		json     string
		expected bool
	}{
		{
			name:     "real question with options",
			json:     `{"text": "Should I proceed with implementation?", "options": ["Yes", "No"]}`,
			expected: false,
		},
		{
			name:     "real question no options",
			json:     `{"text": "Which approach do you prefer?"}`,
			expected: false,
		},
		{
			name:     "completion report no options no question mark",
			json:     `{"text": "All tests pass. Implementation complete. Summary written to CLAUDOMATOR_SUMMARY_FILE."}`,
			expected: true,
		},
		{
			name:     "completion report with empty options",
			json:     `{"text": "Feature implemented and committed.", "options": []}`,
			expected: true,
		},
		{
			name:     "invalid json treated as not a report",
			json:     `not json`,
			expected: false,
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			got := isCompletionReport(tt.json)
			if got != tt.expected {
				t.Errorf("isCompletionReport(%q) = %v, want %v", tt.json, got, tt.expected)
			}
		})
	}
}

func TestTailFile_ReturnsLastNLines(t *testing.T) {
	f, err := os.CreateTemp("", "tailfile-*")
	if err != nil {
		t.Fatal(err)
	}
	defer os.Remove(f.Name())
	for i := 1; i <= 30; i++ {
		fmt.Fprintf(f, "line %d\n", i)
	}
	f.Close()

	got := tailFile(f.Name(), 5)
	lines := strings.Split(strings.TrimSpace(got), "\n")
	if len(lines) != 5 {
		t.Fatalf("want 5 lines, got %d: %q", len(lines), got)
	}
	if lines[0] != "line 26" || lines[4] != "line 30" {
		t.Errorf("want lines 26-30, got: %q", got)
	}
}

func TestGitSafe_PrependsSafeDirectory(t *testing.T) {
	got := gitSafe("-C", "/some/path", "status")
	want := []string{"-c", "safe.directory=*", "-C", "/some/path", "status"}
	if len(got) != len(want) {
		t.Fatalf("gitSafe() = %v, want %v", got, want)
	}
	for i := range want {
		if got[i] != want[i] {
			t.Errorf("gitSafe()[%d] = %q, want %q", i, got[i], want[i])
		}
	}
}