package handlers

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

	"github.com/go-chi/chi/v5"
	"github.com/orchard9/rdev/internal/adapter/kubernetes"
	"github.com/orchard9/rdev/internal/domain"
)

// newTestProjectsHandler creates a ProjectsHandler for testing.
// It registers a test project "test-project" for use in tests.
func newTestProjectsHandler() *ProjectsHandler {
	repo := kubernetes.NewProjectRepository("test-namespace")
	// Register a test project for tests to use
	_ = repo.Register(context.Background(), &domain.Project{
		ID:          "test-project",
		Name:        "Test Project",
		Description: "Test project for unit tests",
		PodName:     "test-project-pod-0",
		Status:      domain.ProjectStatusRunning,
		Workspace:   "/workspace",
	})
	exec := kubernetes.NewExecutor("test-namespace")
	return NewProjectsHandler(repo, exec)
}

// TestProjectsHandler_List tests the List endpoint.
func TestProjectsHandler_List(t *testing.T) {
	h := newTestProjectsHandler()
	router := chi.NewRouter()
	router.Use(testAdminAuth)
	h.Mount(router)

	req := httptest.NewRequest("GET", "/projects", nil)
	rec := httptest.NewRecorder()

	router.ServeHTTP(rec, req)

	if rec.Code != http.StatusOK {
		t.Errorf("Status = %d, want 200", rec.Code)
	}

	var resp map[string]any
	if err := json.NewDecoder(rec.Body).Decode(&resp); err != nil {
		t.Fatalf("Failed to decode response: %v", err)
	}

	if _, ok := resp["data"]; !ok {
		t.Error("Response missing 'data' field")
	}

	if _, ok := resp["meta"]; !ok {
		t.Error("Response missing 'meta' field")
	}
}

// TestProjectsHandler_Get tests the Get endpoint.
func TestProjectsHandler_Get(t *testing.T) {
	h := newTestProjectsHandler()
	router := chi.NewRouter()
	router.Use(testAdminAuth)
	h.Mount(router)

	tests := []struct {
		name       string
		projectID  string
		wantStatus int
	}{
		{"existing project", "test-project", http.StatusOK},
		{"non-existent project", "nonexistent", http.StatusNotFound},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			req := httptest.NewRequest("GET", "/projects/"+tt.projectID, nil)
			rec := httptest.NewRecorder()

			router.ServeHTTP(rec, req)

			if rec.Code != tt.wantStatus {
				t.Errorf("Status = %d, want %d", rec.Code, tt.wantStatus)
			}
		})
	}
}

// TestProjectsHandler_RunClaude tests the RunClaude endpoint.
func TestProjectsHandler_RunClaude(t *testing.T) {
	h := newTestProjectsHandler()
	router := chi.NewRouter()
	router.Use(testAdminAuth)
	h.Mount(router)

	tests := []struct {
		name       string
		projectID  string
		body       any
		wantStatus int
		wantErr    string
	}{
		{
			name:      "valid request",
			projectID: "test-project",
			body: ClaudeRequest{
				Prompt: "Hello, world!",
			},
			wantStatus: http.StatusCreated,
		},
		{
			name:      "missing prompt",
			projectID: "test-project",
			body: ClaudeRequest{
				Prompt: "",
			},
			wantStatus: http.StatusBadRequest,
			wantErr:    "prompt: is required",
		},
		{
			name:       "project not found",
			projectID:  "nonexistent",
			body:       ClaudeRequest{Prompt: "test"},
			wantStatus: http.StatusNotFound,
		},
		{
			name:      "null byte in prompt",
			projectID: "test-project",
			body: ClaudeRequest{
				Prompt: "Hello\x00World",
			},
			wantStatus: http.StatusBadRequest,
			wantErr:    "null byte",
		},
		{
			name:      "invalid stream ID",
			projectID: "test-project",
			body: ClaudeRequest{
				Prompt:   "Hello",
				StreamID: "invalid stream id with spaces",
			},
			wantStatus: http.StatusBadRequest,
			wantErr:    "alphanumeric",
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			body, _ := json.Marshal(tt.body)
			req := httptest.NewRequest("POST", "/projects/"+tt.projectID+"/claude", bytes.NewReader(body))
			req.Header.Set("Content-Type", "application/json")
			rec := httptest.NewRecorder()

			router.ServeHTTP(rec, req)

			if rec.Code != tt.wantStatus {
				t.Errorf("Status = %d, want %d. Body: %s", rec.Code, tt.wantStatus, rec.Body.String())
			}

			if tt.wantErr != "" {
				if !strings.Contains(rec.Body.String(), tt.wantErr) {
					t.Errorf("Body = %q, want to contain %q", rec.Body.String(), tt.wantErr)
				}
			}
		})
	}
}

// TestProjectsHandler_RunShell tests the RunShell endpoint.
func TestProjectsHandler_RunShell(t *testing.T) {
	h := newTestProjectsHandler()
	router := chi.NewRouter()
	router.Use(testAdminAuth)
	h.Mount(router)

	tests := []struct {
		name       string
		projectID  string
		body       any
		wantStatus int
		wantErr    string
	}{
		{
			name:      "valid command",
			projectID: "test-project",
			body: ShellRequest{
				Command: "ls -la",
			},
			wantStatus: http.StatusCreated,
		},
		{
			name:      "missing command",
			projectID: "test-project",
			body: ShellRequest{
				Command: "",
			},
			wantStatus: http.StatusBadRequest,
			wantErr:    "command: is required",
		},
		{
			name:      "dangerous command with semicolon",
			projectID: "test-project",
			body: ShellRequest{
				Command: "ls; rm -rf /",
			},
			wantStatus: http.StatusBadRequest,
			wantErr:    "command chaining",
		},
		{
			name:      "dangerous command with pipe",
			projectID: "test-project",
			body: ShellRequest{
				Command: "cat /etc/passwd | grep root",
			},
			wantStatus: http.StatusBadRequest,
			wantErr:    "command chaining",
		},
		{
			name:      "command substitution",
			projectID: "test-project",
			body: ShellRequest{
				Command: "echo $(whoami)",
			},
			wantStatus: http.StatusBadRequest,
			wantErr:    "command chaining",
		},
		{
			name:      "redirect",
			projectID: "test-project",
			body: ShellRequest{
				Command: "ls > /tmp/out.txt",
			},
			wantStatus: http.StatusBadRequest,
			wantErr:    "redirect",
		},
		{
			name:      "rm rf root",
			projectID: "test-project",
			body: ShellRequest{
				Command: "rm -rf /",
			},
			wantStatus: http.StatusBadRequest,
			wantErr:    "destructive rm",
		},
		{
			name:       "project not found",
			projectID:  "nonexistent",
			body:       ShellRequest{Command: "ls"},
			wantStatus: http.StatusNotFound,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			body, _ := json.Marshal(tt.body)
			req := httptest.NewRequest("POST", "/projects/"+tt.projectID+"/shell", bytes.NewReader(body))
			req.Header.Set("Content-Type", "application/json")
			rec := httptest.NewRecorder()

			router.ServeHTTP(rec, req)

			if rec.Code != tt.wantStatus {
				t.Errorf("Status = %d, want %d. Body: %s", rec.Code, tt.wantStatus, rec.Body.String())
			}

			if tt.wantErr != "" {
				if !strings.Contains(rec.Body.String(), tt.wantErr) {
					t.Errorf("Body = %q, want to contain %q", rec.Body.String(), tt.wantErr)
				}
			}
		})
	}
}

// TestProjectsHandler_RunGit tests the RunGit endpoint.
func TestProjectsHandler_RunGit(t *testing.T) {
	h := newTestProjectsHandler()
	router := chi.NewRouter()
	router.Use(testAdminAuth)
	h.Mount(router)

	tests := []struct {
		name       string
		projectID  string
		body       any
		wantStatus int
		wantErr    string
	}{
		{
			name:      "valid git status",
			projectID: "test-project",
			body: GitRequest{
				Args: []string{"status"},
			},
			wantStatus: http.StatusCreated,
		},
		{
			name:      "valid git log",
			projectID: "test-project",
			body: GitRequest{
				Args: []string{"log", "--oneline", "-10"},
			},
			wantStatus: http.StatusCreated,
		},
		{
			name:      "missing args",
			projectID: "test-project",
			body: GitRequest{
				Args: []string{},
			},
			wantStatus: http.StatusBadRequest,
			wantErr:    "args: is required",
		},
		{
			name:      "git config blocked",
			projectID: "test-project",
			body: GitRequest{
				Args: []string{"config", "--global", "user.name", "attacker"},
			},
			wantStatus: http.StatusBadRequest,
			wantErr:    "git config",
		},
		{
			name:      "git remote blocked",
			projectID: "test-project",
			body: GitRequest{
				Args: []string{"remote", "add", "evil", "https://evil.com/repo"},
			},
			wantStatus: http.StatusBadRequest,
			wantErr:    "git remote",
		},
		{
			name:      "force push blocked",
			projectID: "test-project",
			body: GitRequest{
				Args: []string{"push", "-f", "origin", "main"},
			},
			wantStatus: http.StatusBadRequest,
			wantErr:    "force push",
		},
		{
			name:       "project not found",
			projectID:  "nonexistent",
			body:       GitRequest{Args: []string{"status"}},
			wantStatus: http.StatusNotFound,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			body, _ := json.Marshal(tt.body)
			req := httptest.NewRequest("POST", "/projects/"+tt.projectID+"/git", bytes.NewReader(body))
			req.Header.Set("Content-Type", "application/json")
			rec := httptest.NewRecorder()

			router.ServeHTTP(rec, req)

			if rec.Code != tt.wantStatus {
				t.Errorf("Status = %d, want %d. Body: %s", rec.Code, tt.wantStatus, rec.Body.String())
			}

			if tt.wantErr != "" {
				if !strings.Contains(rec.Body.String(), tt.wantErr) {
					t.Errorf("Body = %q, want to contain %q", rec.Body.String(), tt.wantErr)
				}
			}
		})
	}
}

// TestProjectsHandler_Events tests the Events SSE endpoint.
func TestProjectsHandler_Events(t *testing.T) {
	h := newTestProjectsHandler()
	router := chi.NewRouter()
	router.Use(testAdminAuth)
	h.Mount(router)

	// Note: SSE tests with headers are difficult in httptest because the
	// handler blocks waiting for events. We test what we can without blocking.

	t.Run("project not found", func(t *testing.T) {
		req := httptest.NewRequest("GET", "/projects/nonexistent/events", nil)
		rec := httptest.NewRecorder()

		router.ServeHTTP(rec, req)

		if rec.Code != http.StatusNotFound {
			t.Errorf("Status = %d, want 404", rec.Code)
		}
	})
}

// TestProjectsHandler_InvalidJSON tests handling of invalid JSON bodies.
func TestProjectsHandler_InvalidJSON(t *testing.T) {
	h := newTestProjectsHandler()
	router := chi.NewRouter()
	router.Use(testAdminAuth)
	h.Mount(router)

	endpoints := []struct {
		method string
		path   string
	}{
		{"POST", "/projects/test-project/claude"},
		{"POST", "/projects/test-project/shell"},
		{"POST", "/projects/test-project/git"},
	}

	for _, ep := range endpoints {
		t.Run(ep.path, func(t *testing.T) {
			req := httptest.NewRequest(ep.method, ep.path, strings.NewReader("invalid json{"))
			req.Header.Set("Content-Type", "application/json")
			rec := httptest.NewRecorder()

			router.ServeHTTP(rec, req)

			if rec.Code != http.StatusBadRequest {
				t.Errorf("Status = %d, want 400. Body: %s", rec.Code, rec.Body.String())
			}

			if !strings.Contains(rec.Body.String(), "invalid") {
				t.Errorf("Body = %q, want to contain 'invalid'", rec.Body.String())
			}
		})
	}
}

// TestCommandIDGeneration tests that command IDs are generated correctly.
func TestCommandIDGeneration(t *testing.T) {
	h := newTestProjectsHandler()
	router := chi.NewRouter()
	router.Use(testAdminAuth)
	h.Mount(router)

	// Send two requests and verify they get different command IDs
	body := ClaudeRequest{Prompt: "test"}
	bodyBytes, _ := json.Marshal(body)

	req1 := httptest.NewRequest("POST", "/projects/test-project/claude", bytes.NewReader(bodyBytes))
	req1.Header.Set("Content-Type", "application/json")
	rec1 := httptest.NewRecorder()
	router.ServeHTTP(rec1, req1)

	req2 := httptest.NewRequest("POST", "/projects/test-project/claude", bytes.NewReader(bodyBytes))
	req2.Header.Set("Content-Type", "application/json")
	rec2 := httptest.NewRecorder()
	router.ServeHTTP(rec2, req2)

	// Parse both responses
	var resp1, resp2 map[string]any
	json.NewDecoder(bytes.NewReader(rec1.Body.Bytes())).Decode(&resp1)
	json.NewDecoder(bytes.NewReader(rec2.Body.Bytes())).Decode(&resp2)

	data1, _ := resp1["data"].(map[string]any)
	data2, _ := resp2["data"].(map[string]any)

	if data1["id"] == data2["id"] {
		t.Error("Two requests should have different command IDs")
	}
}

// TestCustomStreamID tests that custom stream IDs are used when provided.
func TestCustomStreamID(t *testing.T) {
	h := newTestProjectsHandler()
	router := chi.NewRouter()
	router.Use(testAdminAuth)
	h.Mount(router)

	body := ClaudeRequest{
		Prompt:   "test",
		StreamID: "my-custom-stream-id",
	}
	bodyBytes, _ := json.Marshal(body)

	req := httptest.NewRequest("POST", "/projects/test-project/claude", bytes.NewReader(bodyBytes))
	req.Header.Set("Content-Type", "application/json")
	rec := httptest.NewRecorder()
	router.ServeHTTP(rec, req)

	var resp map[string]any
	json.NewDecoder(rec.Body).Decode(&resp)

	data, _ := resp["data"].(map[string]any)

	if data["id"] != "my-custom-stream-id" {
		t.Errorf("Command ID = %v, want my-custom-stream-id", data["id"])
	}
}