package domain

import (
	"testing"
	"time"

	"calllinesystem/server/internal/model"
)

func TestETAUsesIntervalForEveryPersonAhead(t *testing.T) {
	result, err := CalculateETA(ETAInput{
		PeopleAhead: 9, IntervalPerPerson: 90 * time.Second, Running: true,
	})
	if err != nil || !result.Available {
		t.Fatalf("got %#v, %v", result, err)
	}
	if result.EstimateMinutes != 15 || result.MinMinutes != 15 || result.MaxMinutes != 15 {
		t.Fatalf("unexpected result %#v", result)
	}
}

func TestETAExcludesCurrentParty(t *testing.T) {
	result, err := CalculateETA(ETAInput{PeopleAhead: 0, IntervalPerPerson: 90 * time.Second, Running: true})
	if err != nil || !result.Available || result.EstimateMinutes != 0 {
		t.Fatalf("got %#v, %v", result, err)
	}
}

func TestSelectTicketsForCall(t *testing.T) {
	tickets := []model.QueueTicket{
		{ID: "one", PartySize: 3},
		{ID: "two", PartySize: 4},
		{ID: "three", PartySize: 2},
	}
	byTicket, people, err := SelectTicketsForCall(tickets, model.CallModeTicket, 2)
	if err != nil || len(byTicket) != 2 || people != 7 {
		t.Fatalf("ticket selection = %#v, %d, %v", byTicket, people, err)
	}
	byPeople, people, err := SelectTicketsForCall(tickets, model.CallModePeople, 5)
	if err != nil || len(byPeople) != 1 || people != 3 || byPeople[0].ID != "one" {
		t.Fatalf("people selection = %#v, %d, %v", byPeople, people, err)
	}
	if _, _, err := SelectTicketsForCall(tickets, model.CallModePeople, 2); err != ErrFirstTicketExceedsPeopleTarget {
		t.Fatalf("expected first-ticket overflow, got %v", err)
	}
}

func TestETAUnavailableWhenPaused(t *testing.T) {
	result, err := CalculateETA(ETAInput{Running: false})
	if err != nil || result.Available || result.Reason != "queue_not_running" {
		t.Fatalf("got %#v, %v", result, err)
	}
}

func TestDisplayExperiencedPeopleUsesConfiguredStartUntilActualCountExceedsIt(t *testing.T) {
	tests := []struct {
		start  int
		actual int64
		want   int64
	}{
		{start: 0, actual: 0, want: 0},
		{start: 20, actual: 0, want: 20},
		{start: 20, actual: 19, want: 20},
		{start: 20, actual: 20, want: 20},
		{start: 20, actual: 21, want: 21},
		{start: -1, actual: -3, want: 0},
	}
	for _, test := range tests {
		if got := DisplayExperiencedPeople(test.start, test.actual); got != test.want {
			t.Fatalf("DisplayExperiencedPeople(%d, %d) = %d, want %d", test.start, test.actual, got, test.want)
		}
	}
}

func TestTicketRules(t *testing.T) {
	if !CanTransitionTicket(model.TicketCalled, model.TicketArrived) || !CanTransitionTicket(model.TicketArrived, model.TicketCompleted) {
		t.Fatal("expected normal transitions")
	}
	if CanTransitionTicket(model.TicketMissed, model.TicketWaiting) || CanTransitionTicket(model.TicketArrived, model.TicketMissed) {
		t.Fatal("missed tickets must be reissued at the tail")
	}
	number, err := DisplayNumber("", 12)
	if err != nil || number != "00012" {
		t.Fatalf("got %q, %v", number, err)
	}
}