package main

import (
	"testing"
)

func TestMigrate(t *testing.T) {
	app := testApp(t)
	// Verify tables exist by querying each one
	tables := []string{"event", "participants", "participant_roles", "attendees", "departments", "volunteers", "shifts", "volunteer_shifts"}
	for _, table := range tables {
		var count int
		err := app.db.QueryRow("SELECT COUNT(*) FROM " + table).Scan(&count)
		if err != nil {
			t.Errorf("table %s: %v", table, err)
		}
	}
}

func TestAttendeesCRUD(t *testing.T) {
	app := testApp(t)

	a, err := app.createAttendee(Attendee{Name: "Titania", Email: "titania@test.com", TicketType: "GA"})
	if err != nil {
		t.Fatal(err)
	}
	if a.ID == 0 || a.Name != "Titania" {
		t.Errorf("create: got %+v", a)
	}

	got, err := app.getAttendee(a.ID)
	if err != nil || got == nil {
		t.Fatal("get: not found")
	}
	if got.Email != "titania@test.com" {
		t.Errorf("get: email = %q", got.Email)
	}

	got.Name = "Titania Fairweather"
	if err := app.updateAttendee(*got); err != nil {
		t.Fatal(err)
	}
	got2, _ := app.getAttendee(a.ID)
	if got2.Name != "Titania Fairweather" {
		t.Errorf("update: name = %q", got2.Name)
	}

	if err := app.deleteAttendee(a.ID); err != nil {
		t.Fatal(err)
	}
	// getAttendee returns soft-deleted records; listAttendees filters them
	attendees, _ := app.listAttendees("", "", "")
	for _, at := range attendees {
		if at.ID == a.ID {
			t.Error("delete: still visible in list")
		}
	}
}

func TestIncrementPartySize(t *testing.T) {
	app := testApp(t)

	app.createAttendee(Attendee{Name: "Oberon", TicketID: "ORD-100"})

	merged, err := app.incrementPartySize("Oberon", "ORD-100")
	if err != nil || !merged {
		t.Fatalf("increment: merged=%v, err=%v", merged, err)
	}

	a, _ := app.getAttendee(1)
	if a.PartySize != 2 {
		t.Errorf("party_size = %d, want 2", a.PartySize)
	}

	// Different ticket_id should not merge
	merged2, _ := app.incrementPartySize("Oberon", "ORD-200")
	if merged2 {
		t.Error("should not merge different ticket_id")
	}
}

func TestCheckInAttendee(t *testing.T) {
	app := testApp(t)
	admin := testAdminUser(t, app)

	app.createAttendee(Attendee{Name: "Puck"})
	// Set party_size directly since createAttendee defaults to 1
	app.db.Exec(`UPDATE attendees SET party_size = 3 WHERE id = 1`)

	// Check in 1
	a, err := app.checkInAttendee(1, admin.ID, 1)
	if err != nil {
		t.Fatal(err)
	}
	if a.CheckedInCount != 1 || !a.CheckedIn {
		t.Errorf("after 1: count=%d, checked_in=%v", a.CheckedInCount, a.CheckedIn)
	}

	// Check in 2 more (should cap at party_size=3)
	a, _ = app.checkInAttendee(1, admin.ID, 5)
	if a.CheckedInCount != 3 {
		t.Errorf("after cap: count=%d, want 3", a.CheckedInCount)
	}

	// Check in again — already full, should stay at 3
	a, _ = app.checkInAttendee(1, admin.ID, 1)
	if a.CheckedInCount != 3 {
		t.Errorf("after full: count=%d, want 3", a.CheckedInCount)
	}
}

func TestGenerateToken(t *testing.T) {
	token, err := generateToken()
	if err != nil {
		t.Fatal(err)
	}
	if len(token) != 8 {
		t.Errorf("token length = %d, want 8", len(token))
	}
	for _, c := range token {
		if !isValidTokenChar(c) {
			t.Errorf("invalid char %c in token %s", c, token)
		}
	}
}

func isValidTokenChar(c rune) bool {
	for _, tc := range tokenChars {
		if c == tc {
			return true
		}
	}
	return false
}

func TestGenerateUniqueToken(t *testing.T) {
	app := testApp(t)
	token, err := app.generateUniqueToken()
	if err != nil || len(token) != 8 {
		t.Fatalf("token=%q, err=%v", token, err)
	}
}

func TestDepartmentsCRUD(t *testing.T) {
	app := testApp(t)

	d, err := app.createDepartment(Department{Name: "Gate"})
	if err != nil {
		t.Fatal(err)
	}
	if d.Name != "Gate" {
		t.Errorf("name = %q", d.Name)
	}

	depts, _ := app.listDepartments("")
	if len(depts) != 1 {
		t.Errorf("list: got %d", len(depts))
	}

	if err := app.deleteDepartment(d.ID); err != nil {
		t.Fatal(err)
	}
}

func TestShiftsCRUD(t *testing.T) {
	app := testApp(t)

	dept, _ := app.createDepartment(Department{Name: "Gate"})
	s, err := app.createShift(Shift{
		DepartmentID: dept.ID,
		Name:         "Morning",
		Day:          "2026-03-15",
		StartTime:    "08:00",
		EndTime:      "12:00",
		Capacity:     5,
	})
	if err != nil {
		t.Fatal(err)
	}
	if s.Name != "Morning" || s.Capacity != 5 {
		t.Errorf("create: %+v", s)
	}

	got, _ := app.getShift(s.ID)
	if got == nil || got.Day != "2026-03-15" {
		t.Error("get: not found or wrong day")
	}

	if err := app.deleteShift(s.ID); err != nil {
		t.Fatal(err)
	}
}

func TestAssignAndUnassignShift(t *testing.T) {
	app := testApp(t)

	dept, _ := app.createDepartment(Department{Name: "Gate"})
	deptID := dept.ID
	s, _ := app.createShift(Shift{DepartmentID: deptID, Name: "AM", Day: "2026-03-15", StartTime: "08:00", EndTime: "12:00", Capacity: 2})
	p, _ := app.createParticipant(Participant{PreferredName: "Helena", Email: "helena@test.com"})
	v, _ := app.createVolunteer(Volunteer{ParticipantID: p.ID, DepartmentID: &deptID})

	if err := app.assignShift(v.ID, s.ID); err != nil {
		t.Fatal(err)
	}
	count, _ := app.shiftAssignedCount(s.ID)
	if count != 1 {
		t.Errorf("assigned count = %d, want 1", count)
	}

	if err := app.unassignShift(v.ID, s.ID); err != nil {
		t.Fatal(err)
	}
	count, _ = app.shiftAssignedCount(s.ID)
	if count != 0 {
		t.Errorf("after unassign: count = %d, want 0", count)
	}
}

func TestCheckShiftConflict(t *testing.T) {
	app := testApp(t)

	dept, _ := app.createDepartment(Department{Name: "Gate"})
	deptID := dept.ID
	p, _ := app.createParticipant(Participant{PreferredName: "Hermia", Email: "hermia@test.com"})
	v, _ := app.createVolunteer(Volunteer{ParticipantID: p.ID, DepartmentID: &deptID})

	s1, _ := app.createShift(Shift{DepartmentID: deptID, Name: "Morning", Day: "2026-03-15", StartTime: "08:00", EndTime: "12:00"})
	s2, _ := app.createShift(Shift{DepartmentID: deptID, Name: "Overlap", Day: "2026-03-15", StartTime: "10:00", EndTime: "14:00"})
	s3, _ := app.createShift(Shift{DepartmentID: deptID, Name: "NoOverlap", Day: "2026-03-15", StartTime: "14:00", EndTime: "18:00"})

	app.assignShift(v.ID, s1.ID)

	// s2 overlaps s1 (10:00-14:00 vs 08:00-12:00)
	conflicts, err := app.checkShiftConflict(v.ID, s2.ID)
	if err != nil {
		t.Fatal(err)
	}
	if len(conflicts) != 1 {
		t.Errorf("overlap: got %d conflicts, want 1", len(conflicts))
	}

	// s3 does not overlap s1 (14:00-18:00 vs 08:00-12:00)
	conflicts, _ = app.checkShiftConflict(v.ID, s3.ID)
	if len(conflicts) != 0 {
		t.Errorf("no overlap: got %d conflicts, want 0", len(conflicts))
	}
}

func TestCheckShiftConflictMidnight(t *testing.T) {
	app := testApp(t)

	dept, _ := app.createDepartment(Department{Name: "Sound"})
	deptID := dept.ID
	p, _ := app.createParticipant(Participant{PreferredName: "Lysander", Email: "lysander@test.com"})
	v, _ := app.createVolunteer(Volunteer{ParticipantID: p.ID, DepartmentID: &deptID})

	// Night shift: 22:00-02:00 (spans midnight)
	night, _ := app.createShift(Shift{DepartmentID: deptID, Name: "Night", Day: "2026-03-15", StartTime: "22:00", EndTime: "02:00"})
	// Late shift: 23:00-03:00 (overlaps with night)
	late, _ := app.createShift(Shift{DepartmentID: deptID, Name: "Late", Day: "2026-03-15", StartTime: "23:00", EndTime: "03:00"})
	// Morning shift: 08:00-12:00 (no overlap with night)
	morning, _ := app.createShift(Shift{DepartmentID: deptID, Name: "Morning", Day: "2026-03-15", StartTime: "08:00", EndTime: "12:00"})

	app.assignShift(v.ID, night.ID)

	// Late should conflict with night
	conflicts, _ := app.checkShiftConflict(v.ID, late.ID)
	if len(conflicts) != 1 {
		t.Errorf("midnight overlap: got %d conflicts, want 1", len(conflicts))
	}

	// Morning should not conflict with night
	conflicts, _ = app.checkShiftConflict(v.ID, morning.ID)
	if len(conflicts) != 0 {
		t.Errorf("no midnight overlap: got %d conflicts, want 0", len(conflicts))
	}
}