//go:build test
// +build test

package scheduling

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

	"crussell/db"
	"crussell/mw"
	"crussell/testutils/jwt"
	"crussell/testutils/testdb"

	"github.com/jackc/pgx/v5/pgxpool"
)

func setupTestDB(t *testing.T) func() {
	t.Helper()

	pool := testdb.Pool(t)
	testdb.Migrate(t, pool)

	originalDB := db.DB
	db.DB = pool

	jwt.Init()

	// Seed default working hours
	seedDefaultWorkingHours(t, pool)

	return func() {
		db.DB = originalDB
		pool.Close()
	}
}

func seedDefaultWorkingHours(t *testing.T, pool *pgxpool.Pool) {
	t.Helper()

	// Seed 7 days of working hours (Monday=0 to Sunday=6)
	hours := []struct {
		weekday   int
		startTime string
		endTime   string
		isOpen    bool
	}{
		{0, "09:00", "17:00", true},  // Monday
		{1, "09:00", "17:00", true},  // Tuesday
		{2, "09:00", "17:00", true},  // Wednesday
		{3, "09:00", "17:00", true},  // Thursday
		{4, "09:00", "17:00", true},  // Friday
		{5, "10:00", "16:00", true},  // Saturday
		{6, "00:00", "00:00", false}, // Sunday
	}

	for _, h := range hours {
		_, err := pool.Exec(context.Background(), `
			INSERT INTO working_hours (weekday, start_time, end_time, is_open)
			VALUES ($1, $2, $3, $4)
			ON CONFLICT (weekday) DO UPDATE SET start_time = $2, end_time = $3, is_open = $4
		`, h.weekday, h.startTime, h.endTime, h.isOpen)
		if err != nil {
			t.Fatalf("failed to seed working hours: %v", err)
		}
	}
}

func makeRequest(handler http.HandlerFunc, method, path string, body interface{}) *httptest.ResponseRecorder {
	var req *http.Request
	if body != nil {
		bodyBytes, _ := json.Marshal(body)
		req = httptest.NewRequest(method, path, bytes.NewReader(bodyBytes))
		req.Header.Set("Content-Type", "application/json")
	} else {
		req = httptest.NewRequest(method, path, nil)
	}
	w := httptest.NewRecorder()
	handler.ServeHTTP(w, req)
	return w
}

func makeAuthRequest(handler http.Handler, method, path, token string, body interface{}) *httptest.ResponseRecorder {
	var req *http.Request
	if body != nil {
		bodyBytes, _ := json.Marshal(body)
		req = httptest.NewRequest(method, path, bytes.NewReader(bodyBytes))
		req.Header.Set("Content-Type", "application/json")
	} else {
		req = httptest.NewRequest(method, path, nil)
	}
	if token != "" {
		req.Header.Set("Authorization", "Bearer "+token)
	}
	w := httptest.NewRecorder()
	handler.ServeHTTP(w, req)
	return w
}

// --- Tests for GetDefaultHours ---

func TestScheduling_GetDefaultHours(t *testing.T) {
	cleanup := setupTestDB(t)
	defer cleanup()

	handler := http.HandlerFunc(GetDefaultHours)
	w := makeRequest(handler, "GET", "/api/scheduling/default-hours", nil)

	if w.Code != http.StatusOK {
		t.Errorf("expected status 200, got %d. body: %s", w.Code, w.Body.String())
	}

	var response []DefaultHours
	if err := json.Unmarshal(w.Body.Bytes(), &response); err != nil {
		t.Fatalf("failed to unmarshal response: %v", err)
	}

	if len(response) != 7 {
		t.Errorf("expected 7 days of hours, got %d", len(response))
	}

	// Verify Monday (weekday 0) has our seeded hours
	var monday *DefaultHours
	for i := range response {
		if response[i].Weekday == 0 {
			monday = &response[i]
			break
		}
	}
	if monday == nil {
		t.Fatal("expected Monday hours in response")
	}
	// Database returns HH:MM:SS format
	if monday.StartTime != "09:00:00" {
		t.Errorf("expected Monday start time 09:00:00, got %s", monday.StartTime)
	}
	if monday.EndTime != "17:00:00" {
		t.Errorf("expected Monday end time 17:00:00, got %s", monday.EndTime)
	}
	if !monday.IsOpen {
		t.Error("expected Monday to be open")
	}
}

// --- Tests for UpdateDefaultHours ---

func TestScheduling_UpdateDefaultHours_Admin(t *testing.T) {
	cleanup := setupTestDB(t)
	defer cleanup()

	adminToken := jwt.GenerateAdminToken()
	handler := http.HandlerFunc(UpdateDefaultHours)

	newHours := []DefaultHours{
		{Weekday: 0, StartTime: "08:00", EndTime: "18:00", IsOpen: true},
		{Weekday: 1, StartTime: "08:00", EndTime: "18:00", IsOpen: true},
		{Weekday: 2, StartTime: "08:00", EndTime: "18:00", IsOpen: true},
		{Weekday: 3, StartTime: "08:00", EndTime: "18:00", IsOpen: true},
		{Weekday: 4, StartTime: "08:00", EndTime: "18:00", IsOpen: true},
		{Weekday: 5, StartTime: "09:00", EndTime: "17:00", IsOpen: true},
		{Weekday: 6, StartTime: "00:00", EndTime: "00:00", IsOpen: false},
	}

	w := makeAuthRequest(handler, "PUT", "/api/scheduling/default-hours", adminToken, newHours)

	if w.Code != http.StatusNoContent {
		t.Errorf("expected status 204, got %d. body: %s", w.Code, w.Body.String())
	}

	// Verify the update persisted
	var hours []DefaultHours
	rows, err := db.DB.Query(context.Background(), `SELECT weekday, start_time::text, end_time::text, is_open FROM working_hours ORDER BY weekday`)
	if err != nil {
		t.Fatalf("failed to query hours: %v", err)
	}
	defer rows.Close()

	for rows.Next() {
		var h DefaultHours
		if err := rows.Scan(&h.Weekday, &h.StartTime, &h.EndTime, &h.IsOpen); err != nil {
			t.Fatalf("failed to scan hours: %v", err)
		}
		hours = append(hours, h)
	}

	if hours[0].StartTime != "08:00:00" {
		t.Errorf("expected Monday start time 08:00:00, got %s", hours[0].StartTime)
	}
}

func TestScheduling_UpdateDefaultHours_NonAdmin(t *testing.T) {
	cleanup := setupTestDB(t)
	defer cleanup()

	userToken := jwt.GenerateUserToken("user-123")

	newHours := []DefaultHours{
		{Weekday: 0, StartTime: "08:00", EndTime: "18:00", IsOpen: true},
		{Weekday: 1, StartTime: "08:00", EndTime: "18:00", IsOpen: true},
		{Weekday: 2, StartTime: "08:00", EndTime: "18:00", IsOpen: true},
		{Weekday: 3, StartTime: "08:00", EndTime: "18:00", IsOpen: true},
		{Weekday: 4, StartTime: "08:00", EndTime: "18:00", IsOpen: true},
		{Weekday: 5, StartTime: "09:00", EndTime: "17:00", IsOpen: true},
		{Weekday: 6, StartTime: "00:00", EndTime: "00:00", IsOpen: false},
	}

	// Wrap handler with RequireAdmin middleware
	w := makeAuthRequest(mw.RequireAdmin(http.HandlerFunc(UpdateDefaultHours)), "PUT", "/api/scheduling/default-hours", userToken, newHours)

	if w.Code != http.StatusForbidden {
		t.Errorf("expected status 403, got %d. body: %s", w.Code, w.Body.String())
	}
}

// --- Tests for ListExceptionalGroups ---

func TestScheduling_ListExceptionalGroups(t *testing.T) {
	cleanup := setupTestDB(t)
	defer cleanup()

	// Create an exceptional group
	_, err := db.DB.Exec(context.Background(), `
		INSERT INTO exceptional_working_hours_groups (name, description)
		VALUES ('Holiday Hours', 'Christmas holiday schedule')
	`)
	if err != nil {
		t.Fatalf("failed to create group: %v", err)
	}

	handler := http.HandlerFunc(ListExceptionalGroups)
	w := makeRequest(handler, "GET", "/api/scheduling/exceptional-groups", nil)

	if w.Code != http.StatusOK {
		t.Errorf("expected status 200, got %d. body: %s", w.Code, w.Body.String())
	}

	var response []ExceptionalGroup
	if err := json.Unmarshal(w.Body.Bytes(), &response); err != nil {
		t.Fatalf("failed to unmarshal response: %v", err)
	}

	if len(response) == 0 {
		t.Error("expected at least one group in response")
	}

	if response[0].Name != "Holiday Hours" {
		t.Errorf("expected group name 'Holiday Hours', got %s", response[0].Name)
	}
}

// --- Tests for CreateExceptionalGroup ---

func TestScheduling_CreateExceptionalGroup_Admin(t *testing.T) {
	cleanup := setupTestDB(t)
	defer cleanup()

	adminToken := jwt.GenerateAdminToken()
	handler := http.HandlerFunc(CreateExceptionalGroup)

	newGroup := ExceptionalGroup{
		Name:        "Summer Hours",
		Description: "Extended summer schedule",
		Hours: []ExceptionalHours{
			{Weekday: 0, StartTime: "08:00", EndTime: "18:00", IsOpen: true},
			{Weekday: 1, StartTime: "08:00", EndTime: "18:00", IsOpen: true},
			{Weekday: 2, StartTime: "08:00", EndTime: "18:00", IsOpen: true},
			{Weekday: 3, StartTime: "08:00", EndTime: "18:00", IsOpen: true},
			{Weekday: 4, StartTime: "08:00", EndTime: "18:00", IsOpen: true},
			{Weekday: 5, StartTime: "09:00", EndTime: "17:00", IsOpen: true},
			{Weekday: 6, StartTime: "00:00", EndTime: "00:00", IsOpen: false},
		},
		WeekStarts: []string{"2026-06-01"},
	}

	w := makeAuthRequest(handler, "POST", "/api/scheduling/exceptional-groups", adminToken, newGroup)

	if w.Code != http.StatusCreated {
		t.Errorf("expected status 201, got %d. body: %s", w.Code, w.Body.String())
	}

	var response ExceptionalGroup
	if err := json.Unmarshal(w.Body.Bytes(), &response); err != nil {
		t.Fatalf("failed to unmarshal response: %v", err)
	}

	if response.Name != "Summer Hours" {
		t.Errorf("expected group name 'Summer Hours', got %s", response.Name)
	}
	if len(response.Hours) != 7 {
		t.Errorf("expected 7 hours, got %d", len(response.Hours))
	}
}

func TestScheduling_CreateExceptionalGroup_NonAdmin(t *testing.T) {
	cleanup := setupTestDB(t)
	defer cleanup()

	userToken := jwt.GenerateUserToken("user-123")


	newGroup := ExceptionalGroup{
		Name:        "Summer Hours",
		Description: "Extended summer schedule",
		Hours: []ExceptionalHours{
			{Weekday: 0, StartTime: "08:00", EndTime: "18:00", IsOpen: true},
			{Weekday: 1, StartTime: "08:00", EndTime: "18:00", IsOpen: true},
			{Weekday: 2, StartTime: "08:00", EndTime: "18:00", IsOpen: true},
			{Weekday: 3, StartTime: "08:00", EndTime: "18:00", IsOpen: true},
			{Weekday: 4, StartTime: "08:00", EndTime: "18:00", IsOpen: true},
			{Weekday: 5, StartTime: "09:00", EndTime: "17:00", IsOpen: true},
			{Weekday: 6, StartTime: "00:00", EndTime: "00:00", IsOpen: false},
		},
		WeekStarts: []string{"2026-06-01"},
	}

	w := makeAuthRequest(mw.RequireAdmin(http.HandlerFunc(CreateExceptionalGroup)), "POST", "/api/scheduling/exceptional-groups", userToken, newGroup)

	if w.Code != http.StatusForbidden {
		t.Errorf("expected status 403, got %d. body: %s", w.Code, w.Body.String())
	}
}

// --- Tests for DeleteExceptionalGroup ---

func TestScheduling_DeleteExceptionalGroup_Admin(t *testing.T) {
	cleanup := setupTestDB(t)
	defer cleanup()

	adminToken := jwt.GenerateAdminToken()

	// Create a group to delete
	var groupID int
	err := db.DB.QueryRow(context.Background(), `
		INSERT INTO exceptional_working_hours_groups (name, description)
		VALUES ('To Delete', 'Will be deleted')
		RETURNING id
	`).Scan(&groupID)
	if err != nil {
		t.Fatalf("failed to create group: %v", err)
	}

	handler := http.HandlerFunc(DeleteExceptionalGroup)
	req := httptest.NewRequest("DELETE", "/api/scheduling/exceptional-groups?id="+string(rune(groupID+'0')), nil)
	req.Header.Set("Authorization", "Bearer "+adminToken)
	w := httptest.NewRecorder()
	handler.ServeHTTP(w, req)

	// The handler expects id as query param but as a proper int
	// Let's use proper URL query
	req = httptest.NewRequest("DELETE", "/api/scheduling/exceptional-groups?id="+strconv.Itoa(groupID), nil)
	req.Header.Set("Authorization", "Bearer "+adminToken)
	w = httptest.NewRecorder()
	handler.ServeHTTP(w, req)

	if w.Code != http.StatusNoContent {
		t.Errorf("expected status 204, got %d. body: %s", w.Code, w.Body.String())
	}

	// Verify group was deleted
	var count int
	err = db.DB.QueryRow(context.Background(), `SELECT COUNT(*) FROM exceptional_working_hours_groups WHERE id = $1`, groupID).Scan(&count)
	if err != nil {
		t.Fatalf("failed to check group: %v", err)
	}
	if count != 0 {
		t.Error("expected group to be deleted")
	}
}

func TestScheduling_DeleteExceptionalGroup_NonAdmin(t *testing.T) {
	cleanup := setupTestDB(t)
	defer cleanup()

	userToken := jwt.GenerateUserToken("user-123")

	handler := mw.RequireAdmin(http.HandlerFunc(DeleteExceptionalGroup))
	req := httptest.NewRequest("DELETE", "/api/scheduling/exceptional-groups?id=1", nil)
	req.Header.Set("Authorization", "Bearer "+userToken)
	w := httptest.NewRecorder()
	handler.ServeHTTP(w, req)

	if w.Code != http.StatusForbidden {
		t.Errorf("expected status 403, got %d. body: %s", w.Code, w.Body.String())
	}
}

// --- Tests for GetWorkingHours ---

func TestScheduling_GetWorkingHours(t *testing.T) {
	cleanup := setupTestDB(t)
	defer cleanup()

	handler := http.HandlerFunc(GetWorkingHours)
	req := httptest.NewRequest("GET", "/api/scheduling/working-hours?start=2026-02-16&end=2026-02-22", nil)
	w := httptest.NewRecorder()
	handler.ServeHTTP(w, req)

	if w.Code != http.StatusOK {
		t.Errorf("expected status 200, got %d. body: %s", w.Code, w.Body.String())
	}

	var response []DayWorkingHours
	if err := json.Unmarshal(w.Body.Bytes(), &response); err != nil {
		t.Fatalf("failed to unmarshal response: %v", err)
	}

	if len(response) == 0 {
		t.Error("expected working hours in response")
	}

	// Verify source is "default" for seeded hours
	for _, day := range response {
		if day.Source != "default" {
			t.Errorf("expected source 'default', got %s", day.Source)
		}
		break
	}
}

// --- Tests for GetAvailableHours ---

func TestScheduling_GetAvailableHours(t *testing.T) {
	cleanup := setupTestDB(t)
	defer cleanup()

	handler := http.HandlerFunc(GetAvailableHours)
	req := httptest.NewRequest("GET", "/api/scheduling/available-hours?start=2026-02-16&end=2026-02-22", nil)
	w := httptest.NewRecorder()
	handler.ServeHTTP(w, req)

	if w.Code != http.StatusOK {
		t.Errorf("expected status 200, got %d. body: %s", w.Code, w.Body.String())
	}

	var response []DayAvailableHours
	if err := json.Unmarshal(w.Body.Bytes(), &response); err != nil {
		t.Fatalf("failed to unmarshal response: %v", err)
	}

	if len(response) == 0 {
		t.Error("expected available hours in response")
	}

	// Verify we have slots for open days
	for _, day := range response {
		if day.IsOpen {
			if len(day.Slots) == 0 {
				t.Error("expected slots for open days")
			}
			break
		}
	}
}

// --- Tests for UpdateExceptionalApplications ---

func TestScheduling_UpdateExceptionalApplications_Admin(t *testing.T) {
	cleanup := setupTestDB(t)
	defer cleanup()

	adminToken := jwt.GenerateAdminToken()

	// Create a group
	var groupID int
	err := db.DB.QueryRow(context.Background(), `
		INSERT INTO exceptional_working_hours_groups (name, description)
		VALUES ('Test Group', 'Test')
		RETURNING id
	`).Scan(&groupID)
	if err != nil {
		t.Fatalf("failed to create group: %v", err)
	}

	handler := http.HandlerFunc(UpdateExceptionalApplications)

	reqBody := map[string]interface{}{
		"groupId":    groupID,
		"weekStarts": []string{"2026-03-02", "2026-03-09"},
	}

	w := makeAuthRequest(handler, "PUT", "/api/scheduling/exceptional-applications", adminToken, reqBody)

	if w.Code != http.StatusNoContent {
		t.Errorf("expected status 204, got %d. body: %s", w.Code, w.Body.String())
	}

	// Verify applications were created
	var count int
	err = db.DB.QueryRow(context.Background(), `
		SELECT COUNT(*) FROM exceptional_group_applications WHERE group_id = $1
	`, groupID).Scan(&count)
	if err != nil {
		t.Fatalf("failed to check applications: %v", err)
	}
	if count != 2 {
		t.Errorf("expected 2 applications, got %d", count)
	}
}

func TestScheduling_UpdateExceptionalApplications_NonAdmin(t *testing.T) {
	cleanup := setupTestDB(t)
	defer cleanup()

	userToken := jwt.GenerateUserToken("user-123")
	handler := mw.RequireAdmin(http.HandlerFunc(UpdateExceptionalApplications))

	reqBody := map[string]interface{}{
		"groupId":    1,
		"weekStarts": []string{"2026-03-02"},
	}

	w := makeAuthRequest(handler, "PUT", "/api/scheduling/exceptional-applications", userToken, reqBody)

	if w.Code != http.StatusForbidden {
		t.Errorf("expected status 403, got %d. body: %s", w.Code, w.Body.String())
	}
}