package handler

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

	"github.com/go-chi/chi/v5"
	"github.com/jackc/pgx/v5/pgxpool"
	db "github.com/multica-ai/multica/server/pkg/db/generated"
	"github.com/multica-ai/multica/server/internal/realtime"
)

var testHandler *Handler
var testUserID string
var testWorkspaceID string
var testToken string

func TestMain(m *testing.M) {
	dbURL := os.Getenv("DATABASE_URL")
	if dbURL == "" {
		dbURL = "postgres://multica:multica@localhost:5432/multica?sslmode=disable"
	}

	pool, err := pgxpool.New(context.Background(), dbURL)
	if err != nil {
		fmt.Printf("Skipping tests: could not connect to database: %v\n", err)
		os.Exit(0)
	}
	defer pool.Close()

	queries := db.New(pool)
	hub := realtime.NewHub()
	go hub.Run()
	testHandler = New(queries, pool, hub)

	// Get seed user and workspace IDs
	row := pool.QueryRow(context.Background(), `SELECT id FROM "user" WHERE email = 'jiayuan@multica.ai'`)
	row.Scan(&testUserID)

	row = pool.QueryRow(context.Background(), `SELECT id FROM workspace WHERE slug = 'multica'`)
	row.Scan(&testWorkspaceID)

	if testUserID == "" || testWorkspaceID == "" {
		fmt.Println("Skipping tests: seed data not found. Run 'go run ./cmd/seed/' first.")
		os.Exit(0)
	}

	// Generate a test token
	import_jwt(testUserID)

	os.Exit(m.Run())
}

func import_jwt(userID string) {
	// Simple token generation for tests using the login handler
	// We'll just set the headers directly instead
	testToken = userID // We'll use X-User-ID header directly
}

func newRequest(method, path string, body any) *http.Request {
	var buf bytes.Buffer
	if body != nil {
		json.NewEncoder(&buf).Encode(body)
	}
	req := httptest.NewRequest(method, path, &buf)
	req.Header.Set("Content-Type", "application/json")
	req.Header.Set("X-User-ID", testUserID)
	req.Header.Set("X-Workspace-ID", testWorkspaceID)
	return req
}

func withURLParam(req *http.Request, key, value string) *http.Request {
	rctx := chi.NewRouteContext()
	rctx.URLParams.Add(key, value)
	return req.WithContext(context.WithValue(req.Context(), chi.RouteCtxKey, rctx))
}

func TestIssueCRUD(t *testing.T) {
	// Create
	w := httptest.NewRecorder()
	req := newRequest("POST", "/api/issues?workspace_id="+testWorkspaceID, map[string]any{
		"title":    "Test issue from Go test",
		"status":   "todo",
		"priority": "medium",
	})
	testHandler.CreateIssue(w, req)
	if w.Code != http.StatusCreated {
		t.Fatalf("CreateIssue: expected 201, got %d: %s", w.Code, w.Body.String())
	}

	var created IssueResponse
	json.NewDecoder(w.Body).Decode(&created)
	if created.Title != "Test issue from Go test" {
		t.Fatalf("CreateIssue: expected title 'Test issue from Go test', got '%s'", created.Title)
	}
	if created.Status != "todo" {
		t.Fatalf("CreateIssue: expected status 'todo', got '%s'", created.Status)
	}
	issueID := created.ID

	// Get
	w = httptest.NewRecorder()
	req = newRequest("GET", "/api/issues/"+issueID, nil)
	req = withURLParam(req, "id", issueID)
	testHandler.GetIssue(w, req)
	if w.Code != http.StatusOK {
		t.Fatalf("GetIssue: expected 200, got %d: %s", w.Code, w.Body.String())
	}

	var fetched IssueResponse
	json.NewDecoder(w.Body).Decode(&fetched)
	if fetched.ID != issueID {
		t.Fatalf("GetIssue: expected id '%s', got '%s'", issueID, fetched.ID)
	}

	// Update - partial (only status)
	w = httptest.NewRecorder()
	status := "in_progress"
	req = newRequest("PUT", "/api/issues/"+issueID, map[string]any{
		"status": status,
	})
	req = withURLParam(req, "id", issueID)
	testHandler.UpdateIssue(w, req)
	if w.Code != http.StatusOK {
		t.Fatalf("UpdateIssue: expected 200, got %d: %s", w.Code, w.Body.String())
	}

	var updated IssueResponse
	json.NewDecoder(w.Body).Decode(&updated)
	if updated.Status != "in_progress" {
		t.Fatalf("UpdateIssue: expected status 'in_progress', got '%s'", updated.Status)
	}
	if updated.Title != "Test issue from Go test" {
		t.Fatalf("UpdateIssue: title should be preserved, got '%s'", updated.Title)
	}
	if updated.Priority != "medium" {
		t.Fatalf("UpdateIssue: priority should be preserved, got '%s'", updated.Priority)
	}

	// List
	w = httptest.NewRecorder()
	req = newRequest("GET", "/api/issues?workspace_id="+testWorkspaceID, nil)
	testHandler.ListIssues(w, req)
	if w.Code != http.StatusOK {
		t.Fatalf("ListIssues: expected 200, got %d: %s", w.Code, w.Body.String())
	}

	var listResp map[string]any
	json.NewDecoder(w.Body).Decode(&listResp)
	issues := listResp["issues"].([]any)
	if len(issues) == 0 {
		t.Fatal("ListIssues: expected at least 1 issue")
	}

	// Delete
	w = httptest.NewRecorder()
	req = newRequest("DELETE", "/api/issues/"+issueID, nil)
	req = withURLParam(req, "id", issueID)
	testHandler.DeleteIssue(w, req)
	if w.Code != http.StatusNoContent {
		t.Fatalf("DeleteIssue: expected 204, got %d: %s", w.Code, w.Body.String())
	}

	// Verify deleted
	w = httptest.NewRecorder()
	req = newRequest("GET", "/api/issues/"+issueID, nil)
	req = withURLParam(req, "id", issueID)
	testHandler.GetIssue(w, req)
	if w.Code != http.StatusNotFound {
		t.Fatalf("GetIssue after delete: expected 404, got %d", w.Code)
	}
}

func TestCommentCRUD(t *testing.T) {
	// Create an issue first
	w := httptest.NewRecorder()
	req := newRequest("POST", "/api/issues?workspace_id="+testWorkspaceID, map[string]any{
		"title": "Comment test issue",
	})
	testHandler.CreateIssue(w, req)
	var issue IssueResponse
	json.NewDecoder(w.Body).Decode(&issue)
	issueID := issue.ID

	// Create comment
	w = httptest.NewRecorder()
	req = newRequest("POST", "/api/issues/"+issueID+"/comments", map[string]any{
		"content": "Test comment from Go test",
	})
	req = withURLParam(req, "id", issueID)
	testHandler.CreateComment(w, req)
	if w.Code != http.StatusCreated {
		t.Fatalf("CreateComment: expected 201, got %d: %s", w.Code, w.Body.String())
	}

	// List comments
	w = httptest.NewRecorder()
	req = newRequest("GET", "/api/issues/"+issueID+"/comments", nil)
	req = withURLParam(req, "id", issueID)
	testHandler.ListComments(w, req)
	if w.Code != http.StatusOK {
		t.Fatalf("ListComments: expected 200, got %d: %s", w.Code, w.Body.String())
	}

	var comments []CommentResponse
	json.NewDecoder(w.Body).Decode(&comments)
	if len(comments) != 1 {
		t.Fatalf("ListComments: expected 1 comment, got %d", len(comments))
	}
	if comments[0].Content != "Test comment from Go test" {
		t.Fatalf("ListComments: expected content 'Test comment from Go test', got '%s'", comments[0].Content)
	}

	// Cleanup
	w = httptest.NewRecorder()
	req = newRequest("DELETE", "/api/issues/"+issueID, nil)
	req = withURLParam(req, "id", issueID)
	testHandler.DeleteIssue(w, req)
}

func TestAgentCRUD(t *testing.T) {
	// List agents
	w := httptest.NewRecorder()
	req := newRequest("GET", "/api/agents?workspace_id="+testWorkspaceID, nil)
	testHandler.ListAgents(w, req)
	if w.Code != http.StatusOK {
		t.Fatalf("ListAgents: expected 200, got %d: %s", w.Code, w.Body.String())
	}

	var agents []AgentResponse
	json.NewDecoder(w.Body).Decode(&agents)
	if len(agents) == 0 {
		t.Fatal("ListAgents: expected at least 1 agent")
	}

	// Update agent status
	agentID := agents[0].ID
	w = httptest.NewRecorder()
	req = newRequest("PUT", "/api/agents/"+agentID, map[string]any{
		"status": "idle",
	})
	req = withURLParam(req, "id", agentID)
	testHandler.UpdateAgent(w, req)
	if w.Code != http.StatusOK {
		t.Fatalf("UpdateAgent: expected 200, got %d: %s", w.Code, w.Body.String())
	}

	var updated AgentResponse
	json.NewDecoder(w.Body).Decode(&updated)
	if updated.Status != "idle" {
		t.Fatalf("UpdateAgent: expected status 'idle', got '%s'", updated.Status)
	}
	if updated.Name != agents[0].Name {
		t.Fatalf("UpdateAgent: name should be preserved, got '%s'", updated.Name)
	}
}

func TestWorkspaceCRUD(t *testing.T) {
	// List workspaces
	w := httptest.NewRecorder()
	req := newRequest("GET", "/api/workspaces", nil)
	testHandler.ListWorkspaces(w, req)
	if w.Code != http.StatusOK {
		t.Fatalf("ListWorkspaces: expected 200, got %d: %s", w.Code, w.Body.String())
	}

	var workspaces []WorkspaceResponse
	json.NewDecoder(w.Body).Decode(&workspaces)
	if len(workspaces) == 0 {
		t.Fatal("ListWorkspaces: expected at least 1 workspace")
	}

	// Get workspace
	wsID := workspaces[0].ID
	w = httptest.NewRecorder()
	req = newRequest("GET", "/api/workspaces/"+wsID, nil)
	req = withURLParam(req, "id", wsID)
	testHandler.GetWorkspace(w, req)
	if w.Code != http.StatusOK {
		t.Fatalf("GetWorkspace: expected 200, got %d: %s", w.Code, w.Body.String())
	}
}

func TestAuthLogin(t *testing.T) {
	w := httptest.NewRecorder()
	body := map[string]string{"email": "test-handler@multica.ai", "name": "Test User"}
	var buf bytes.Buffer
	json.NewEncoder(&buf).Encode(body)
	req := httptest.NewRequest("POST", "/auth/login", &buf)
	req.Header.Set("Content-Type", "application/json")
	testHandler.Login(w, req)
	if w.Code != http.StatusOK {
		t.Fatalf("Login: expected 200, got %d: %s", w.Code, w.Body.String())
	}

	var resp LoginResponse
	json.NewDecoder(w.Body).Decode(&resp)
	if resp.Token == "" {
		t.Fatal("Login: expected non-empty token")
	}
	if resp.User.Email != "test-handler@multica.ai" {
		t.Fatalf("Login: expected email 'test-handler@multica.ai', got '%s'", resp.User.Email)
	}
}