package companion

import (
	"reflect"
	"testing"
	"time"

	"longheng.io/server/internal/modules/dnf/equip"
	"longheng.io/server/internal/modules/dnf/repository"
)

func visualFixture(
	sourceID, name, job string,
	grow int64,
	weapon int64,
	avatars map[string]repository.EquipmentEntry,
) (repository.CompanionSourceState, Selection) {
	entries := map[string]repository.EquipmentEntry{
		"weapon": {
			SlotIndex: 12,
			ItemID:    weapon,
			RawEntry:  []byte{1, 2, 3},
			Extra: map[string]string{
				"item_kind":                  "equipment",
				"equipment_type":             "17",
				"current_exe_equipment_type": "12",
				"pvf_path":                   "equipment/character/test/weapon/test.equ",
			},
		},
	}
	for key, value := range avatars {
		entries[key] = value
	}
	state := repository.CompanionSourceState{
		Owner: repository.CharacterRecord{
			CharacterID: "1",
			AccountID:   "account-test",
			Stats:       map[string]int64{"delete_flag": 0},
		},
		Source: repository.CharacterRecord{
			CharacterID: sourceID,
			AccountID:   "account-test",
			Name:        name,
			Job:         job,
			Level:       86,
			Stats:       map[string]int64{"delete_flag": 0, "grow_type": grow},
		},
		Equipment: repository.EquipmentRecord{
			CharacterID: sourceID,
			Entries:     entries,
		},
		HasEquipment: true,
	}
	selection := Selection{
		AccountID:         "account-test",
		OwnerCharacterID:  "1",
		SourceCharacterID: sourceID,
		OnlineStateKnown:  true,
	}
	return state, selection
}

func avatarFixture(slot int16, item int64, equipmentType string) repository.EquipmentEntry {
	return repository.EquipmentEntry{
		SlotIndex: slot,
		ItemID:    item,
		RawEntry:  []byte{4, 5, 6},
		Extra: map[string]string{
			"item_kind":      "avatar",
			"equipment_type": equipmentType,
			"pvf_path":       "equipment/character/test/avatar/test.equ",
		},
	}
}

func TestVisualProjectionSwitchesABAndDoesNotMutateSource(t *testing.T) {
	aState, aSelection := visualFixture(
		"2", "DETSCS", "0", 35, 101010912,
		map[string]repository.EquipmentEntry{
			"hat":  avatarFixture(0, 401550018, "[hat avatar]"),
			"hair": avatarFixture(1, 101560869, "[hair avatar]"),
		},
	)
	bState, bSelection := visualFixture(
		"8", "DETSDT", "13", 3, 114000248,
		map[string]repository.EquipmentEntry{
			"weapon-avatar": avatarFixture(10, 414600011, "[weapon avatar]"),
		},
	)
	aBefore := repository.CompanionSourceState{
		Owner:        repository.CloneCharacter(aState.Owner),
		Source:       repository.CloneCharacter(aState.Source),
		Equipment:    repository.CloneEquipment(aState.Equipment),
		HasEquipment: aState.HasEquipment,
	}
	bBefore := repository.CompanionSourceState{
		Owner:        repository.CloneCharacter(bState.Owner),
		Source:       repository.CloneCharacter(bState.Source),
		Equipment:    repository.CloneEquipment(bState.Equipment),
		HasEquipment: bState.HasEquipment,
	}

	now := time.Unix(1_800_000_000, 0)
	a, err := BuildVisualProjection(aState, aSelection, now)
	if err != nil {
		t.Fatal(err)
	}
	b, err := BuildVisualProjection(bState, bSelection, now)
	if err != nil {
		t.Fatal(err)
	}

	if a.Name != "DETSCS" || b.Name != "DETSDT" ||
		a.Job != 0 || b.Job != 13 ||
		a.GrowType != 35 || b.GrowType != 3 {
		t.Fatalf("identity projection A=%+v B=%+v", a, b)
	}
	if a.Weapon == nil || b.Weapon == nil ||
		a.Weapon.ItemID != 101010912 ||
		b.Weapon.ItemID != 114000248 {
		t.Fatalf("weapon projection A=%+v B=%+v", a.Weapon, b.Weapon)
	}
	if len(a.Avatars) != 2 || len(b.Avatars) != 1 ||
		a.Avatars[0].DisplayItemID != 401550018 ||
		b.Avatars[0].DisplayItemID != 414600011 {
		t.Fatalf("avatar projection A=%+v B=%+v", a.Avatars, b.Avatars)
	}
	if a.Fingerprint() == b.Fingerprint() {
		t.Fatal("different source characters produced same visual fingerprint")
	}
	if !reflect.DeepEqual(aState.Owner, aBefore.Owner) ||
		!reflect.DeepEqual(aState.Source, aBefore.Source) ||
		!reflect.DeepEqual(aState.Equipment, aBefore.Equipment) ||
		!reflect.DeepEqual(bState.Owner, bBefore.Owner) ||
		!reflect.DeepEqual(bState.Source, bBefore.Source) ||
		!reflect.DeepEqual(bState.Equipment, bBefore.Equipment) {
		t.Fatal("BuildVisualProjection mutated source records")
	}

	a.Weapon.ItemID = 1
	a.Avatars[0].ItemID = 2
	if aState.Equipment.Entries["weapon"].ItemID != 101010912 ||
		aState.Equipment.Entries["hat"].ItemID != 401550018 {
		t.Fatal("returned projection aliases source equipment")
	}
}

func TestVisualProjectionAcceptsFreshCharacterWeaponWithoutDerivedKind(t *testing.T) {
	state, selection := visualFixture(
		"2", "DETXX", "11", 0, 101010912, nil,
	)
	weapon := state.Equipment.Entries["weapon"]
	delete(weapon.Extra, "item_kind")
	delete(weapon.Extra, "current_exe_equipment_type")
	weapon.Extra["pvf_path"] = "equipment/character/swordman/weapon/katana/101010912.equ"
	weapon.Extra["equipment_type"] = "17"
	state.Equipment.Entries["weapon"] = weapon

	got, err := BuildVisualProjection(
		state, selection, time.Unix(1_800_000_000, 0),
	)
	if err != nil {
		t.Fatal(err)
	}
	if got.Weapon == nil || got.Weapon.ItemID != 101010912 {
		t.Fatalf("fresh-character weapon projection=%+v", got.Weapon)
	}
}

func TestVisualProjectionUsesCloneAvatarDisplayID(t *testing.T) {
	clone := avatarFixture(3, 499999999, "[coat avatar]")
	clone.Extra[equip.CloneAvatarDisplayItemIDExtraKey] = "412500009"
	state, selection := visualFixture(
		"8", "DETSDT", "13", 3, 114000248,
		map[string]repository.EquipmentEntry{"coat": clone},
	)
	got, err := BuildVisualProjection(
		state, selection, time.Unix(1_800_000_000, 0),
	)
	if err != nil {
		t.Fatal(err)
	}
	if len(got.Avatars) != 1 ||
		got.Avatars[0].ItemID != 499999999 ||
		got.Avatars[0].DisplayItemID != 412500009 {
		t.Fatalf("clone avatar projection=%+v", got.Avatars)
	}
}

func TestVisualProjectionAcceptsPrimaryAndSupportWeapon(t *testing.T) {
	state, selection := visualFixture("13", "Vagabond", "11", 4, 28246, nil)
	secondary := state.Equipment.Entries["weapon"]
	secondary.SlotIndex, secondary.ItemID = 24, 28239
	state.Equipment.Entries["support"] = secondary
	before := repository.CloneEquipment(state.Equipment)
	got, err := BuildVisualProjection(state, selection, time.Unix(1_800_000_000, 0))
	if err != nil || got.Weapon == nil || got.Weapon.Slot != 12 || got.Weapon.ItemID != 28246 {
		t.Fatalf("valid dual weapons rejected or primary changed: %+v err=%v", got, err)
	}
	if !reflect.DeepEqual(before, state.Equipment) {
		t.Fatal("display projection changed source equipment")
	}
	delete(state.Equipment.Entries, "weapon")
	got, err = BuildVisualProjection(state, selection, time.Unix(1_800_000_000, 0))
	if err != nil || got.Weapon != nil {
		t.Fatalf("support weapon substituted for missing primary: %+v err=%v", got, err)
	}
}

func TestVisualProjectionRejectsDuplicateWeapons(t *testing.T) {
	state, selection := visualFixture(
		"2", "DETSCS", "0", 35, 101010912, nil,
	)
	state.Equipment.Entries["weapon2"] = repository.EquipmentEntry{
		SlotIndex: 20,
		ItemID:    101010913,
		Extra: map[string]string{
			"item_kind": "equipment",
			"pvf_path":  "equipment/character/test/weapon/other.equ",
		},
	}
	if _, err := BuildVisualProjection(
		state, selection, time.Unix(1_800_000_000, 0),
	); err != ErrSnapshot {
		t.Fatalf("duplicate weapon err=%v want=%v", err, ErrSnapshot)
	}
}

func TestProjectionSettingsSelectExactDifferentCharacter(t *testing.T) {
	scope, err := SettingsScope("3")
	if err != nil || scope != "character:3:companion-v1" {
		t.Fatalf("scope=%q err=%v", scope, err)
	}
	record := repository.SettingsRecord{
		Scope: scope,
		Values: map[string]string{
			"source_character_id": "2",
		},
	}
	source, found, err := SourceCharacterIDFromSettings(record, "3")
	if err != nil || !found || source != "2" {
		t.Fatalf("source=%q found=%t err=%v", source, found, err)
	}
	record.Values["source_character_id"] = "8"
	source, found, err = SourceCharacterIDFromSettings(record, "3")
	if err != nil || !found || source != "8" {
		t.Fatalf("source=%q found=%t err=%v", source, found, err)
	}

	for _, tc := range []struct {
		name   string
		record repository.SettingsRecord
		owner  string
		want   error
	}{
		{"self", repository.SettingsRecord{Scope: scope, Values: map[string]string{"source_character_id": "3"}}, "3", ErrSelf},
		{"leading zero", repository.SettingsRecord{Scope: scope, Values: map[string]string{"source_character_id": "02"}}, "3", ErrSelection},
		{"wrong scope", repository.SettingsRecord{Scope: "character:4:companion-v1", Values: map[string]string{"source_character_id": "2"}}, "3", ErrSelection},
	} {
		if _, _, got := SourceCharacterIDFromSettings(tc.record, tc.owner); got != tc.want {
			t.Fatalf("%s err=%v want=%v", tc.name, got, tc.want)
		}
	}
}