package security

import (
	"context"
	"errors"
	"fmt"
	"io"
	"sort"
	"sync"
	"time"

	"velox-bot/internal/db/repos/securityrepo"

	"github.com/bwmarrin/discordgo"
)

// fakeStore keeps everything in memory with the same rules as the SQL.
type fakeStore struct {
	mu          sync.Mutex
	settings    map[int64]*securityrepo.Settings
	trusted     map[int64][]securityrepo.Trusted
	quarantines map[string]securityrepo.Quarantine
	lockdowns   map[string]securityrepo.Lockdown
	events      []securityrepo.Event
	cmds        []securityrepo.Command
	done        map[int64]bool
	raids       map[int64]securityrepo.Raid
	caught      map[int64][]securityrepo.Caught
	snapshots   []securityrepo.Snapshot
}

func newStore() *fakeStore {
	return &fakeStore{
		settings: map[int64]*securityrepo.Settings{}, trusted: map[int64][]securityrepo.Trusted{},
		quarantines: map[string]securityrepo.Quarantine{}, lockdowns: map[string]securityrepo.Lockdown{}, done: map[int64]bool{},
		raids: map[int64]securityrepo.Raid{}, caught: map[int64][]securityrepo.Caught{},
	}
}

func (f *fakeStore) SaveRaid(_ context.Context, x securityrepo.Raid) error {
	f.mu.Lock()
	defer f.mu.Unlock()
	if old, ok := f.raids[x.GuildID]; ok {
		x.StartedAt = old.StartedAt
	}
	f.raids[x.GuildID] = x
	return nil
}
func (f *fakeStore) ListRaids(context.Context) ([]securityrepo.Raid, error) {
	f.mu.Lock()
	defer f.mu.Unlock()
	var out []securityrepo.Raid
	for _, x := range f.raids {
		out = append(out, x)
	}
	return out, nil
}
func (f *fakeStore) DeleteRaid(_ context.Context, g int64) error {
	f.mu.Lock()
	defer f.mu.Unlock()
	delete(f.raids, g)
	delete(f.caught, g)
	return nil
}
func (f *fakeStore) AddRaidCaught(_ context.Context, g int64, c securityrepo.Caught) error {
	f.mu.Lock()
	defer f.mu.Unlock()
	for _, x := range f.caught[g] {
		if x.UserID == c.UserID {
			return nil
		}
	}
	f.caught[g] = append(f.caught[g], c)
	return nil
}
func (f *fakeStore) ListRaidCaught(_ context.Context, g int64, limit int) ([]securityrepo.Caught, error) {
	f.mu.Lock()
	defer f.mu.Unlock()
	out := f.caught[g]
	if len(out) > limit {
		out = out[:limit]
	}
	return append([]securityrepo.Caught(nil), out...), nil
}
func (f *fakeStore) SaveSnapshot(_ context.Context, s securityrepo.Snapshot) error {
	f.mu.Lock()
	defer f.mu.Unlock()
	s.ID = int64(len(f.snapshots) + 1)
	s.CreatedAt = time.Date(2026, 10, 20, 6, 0, 0, 0, time.UTC)
	f.snapshots = append(f.snapshots, s)
	return nil
}
func (f *fakeStore) LatestSnapshot(_ context.Context, g int64) (*securityrepo.Snapshot, error) {
	f.mu.Lock()
	defer f.mu.Unlock()
	for i := len(f.snapshots) - 1; i >= 0; i-- {
		if f.snapshots[i].GuildID == g {
			s := f.snapshots[i]
			return &s, nil
		}
	}
	return nil, nil
}
func (f *fakeStore) GuildsDueForSnapshot(context.Context, time.Duration) ([]int64, error) {
	return nil, nil
}

func key(a, b int64) string { return fmt.Sprint(a, "/", b) }

func (f *fakeStore) set(g int64) *securityrepo.Settings {
	f.mu.Lock()
	defer f.mu.Unlock()
	s, ok := f.settings[g]
	if !ok {
		s = securityrepo.Defaults(g)
		s.Configured = true
		f.settings[g] = s
	}
	return s
}

func (f *fakeStore) GetSettings(_ context.Context, g int64) (*securityrepo.Settings, error) {
	f.mu.Lock()
	defer f.mu.Unlock()
	if s, ok := f.settings[g]; ok {
		cp := *s
		return &cp, nil
	}
	return securityrepo.Defaults(g), nil
}
func (f *fakeStore) SetEnabled(_ context.Context, g int64, feature string, on bool) error {
	s := f.set(g)
	switch feature {
	case securityrepo.FeatureJoinGate:
		s.JoinGateEnabled = on
	case securityrepo.FeatureAntiRaid:
		s.AntiRaidEnabled = on
	case securityrepo.FeatureAntiNuke:
		s.AntiNukeEnabled = on
	}
	return nil
}
func (f *fakeStore) SetAlerts(_ context.Context, g, ch, role int64) error {
	s := f.set(g)
	s.AlertChannelID, s.AlertRoleID = ch, role
	return nil
}
func (f *fakeStore) SetQuarantineRole(_ context.Context, g, role int64) error {
	f.set(g).QuarantineRoleID = role
	return nil
}
func (f *fakeStore) SetJoinLock(_ context.Context, g int64, mode string) error {
	f.set(g).JoinLock = mode
	return nil
}
func (f *fakeStore) ListTrusted(_ context.Context, g int64) ([]securityrepo.Trusted, error) {
	f.mu.Lock()
	defer f.mu.Unlock()
	return append([]securityrepo.Trusted(nil), f.trusted[g]...), nil
}
func (f *fakeStore) AddTrusted(_ context.Context, g int64, t securityrepo.Trusted) error {
	f.mu.Lock()
	defer f.mu.Unlock()
	f.trusted[g] = append(f.trusted[g], t)
	return nil
}
func (f *fakeStore) RemoveTrusted(_ context.Context, g, target int64) (bool, error) {
	f.mu.Lock()
	defer f.mu.Unlock()
	var keep []securityrepo.Trusted
	found := false
	for _, t := range f.trusted[g] {
		if t.TargetID == target {
			found = true
			continue
		}
		keep = append(keep, t)
	}
	f.trusted[g] = keep
	return found, nil
}
func (f *fakeStore) SaveQuarantine(_ context.Context, q securityrepo.Quarantine) error {
	f.mu.Lock()
	defer f.mu.Unlock()
	if _, ok := f.quarantines[key(q.GuildID, q.UserID)]; !ok {
		f.quarantines[key(q.GuildID, q.UserID)] = q
	}
	return nil
}
func (f *fakeStore) GetQuarantine(_ context.Context, g, u int64) (*securityrepo.Quarantine, error) {
	f.mu.Lock()
	defer f.mu.Unlock()
	if q, ok := f.quarantines[key(g, u)]; ok {
		return &q, nil
	}
	return nil, nil
}
func (f *fakeStore) ListQuarantines(_ context.Context, g int64) ([]securityrepo.Quarantine, error) {
	f.mu.Lock()
	defer f.mu.Unlock()
	var out []securityrepo.Quarantine
	for _, q := range f.quarantines {
		if q.GuildID == g {
			out = append(out, q)
		}
	}
	return out, nil
}
func (f *fakeStore) DeleteQuarantine(_ context.Context, g, u int64) error {
	f.mu.Lock()
	defer f.mu.Unlock()
	delete(f.quarantines, key(g, u))
	return nil
}
func (f *fakeStore) SaveLockdown(_ context.Context, l securityrepo.Lockdown) error {
	f.mu.Lock()
	defer f.mu.Unlock()
	if _, ok := f.lockdowns[key(l.GuildID, l.ChannelID)]; !ok {
		f.lockdowns[key(l.GuildID, l.ChannelID)] = l
	}
	return nil
}
func (f *fakeStore) GetLockdown(_ context.Context, g, ch int64) (*securityrepo.Lockdown, error) {
	f.mu.Lock()
	defer f.mu.Unlock()
	if l, ok := f.lockdowns[key(g, ch)]; ok {
		return &l, nil
	}
	return nil, nil
}
func (f *fakeStore) ListLockdowns(_ context.Context, g int64, serverOnly bool) ([]securityrepo.Lockdown, error) {
	f.mu.Lock()
	defer f.mu.Unlock()
	var out []securityrepo.Lockdown
	for _, l := range f.lockdowns {
		if l.GuildID == g && (!serverOnly || l.ServerWide) {
			out = append(out, l)
		}
	}
	sort.Slice(out, func(i, j int) bool { return out[i].ChannelID < out[j].ChannelID })
	return out, nil
}
func (f *fakeStore) DeleteLockdown(_ context.Context, g, ch int64) error {
	f.mu.Lock()
	defer f.mu.Unlock()
	delete(f.lockdowns, key(g, ch))
	return nil
}
func (f *fakeStore) AddEvent(_ context.Context, e securityrepo.Event) error {
	f.mu.Lock()
	defer f.mu.Unlock()
	f.events = append(f.events, e)
	return nil
}
func (f *fakeStore) eventKinds() []string {
	f.mu.Lock()
	defer f.mu.Unlock()
	var out []string
	for _, e := range f.events {
		out = append(out, e.Kind)
	}
	return out
}
func (f *fakeStore) ListUnprocessedCommands(context.Context) ([]securityrepo.Command, error) {
	f.mu.Lock()
	defer f.mu.Unlock()
	var out []securityrepo.Command
	for _, c := range f.cmds {
		if !f.done[c.ID] {
			out = append(out, c)
		}
	}
	return out, nil
}
func (f *fakeStore) MarkCommandProcessed(_ context.Context, id int64) error {
	f.mu.Lock()
	defer f.mu.Unlock()
	f.done[id] = true
	return nil
}

// fakeDiscord is a tiny in-memory guild.
type fakeDiscord struct {
	mu          sync.Mutex
	ownerID     string
	roles       []*discordgo.Role
	members     map[string]*discordgo.Member
	users       map[string]*discordgo.User
	channels    map[string]*discordgo.Channel
	kicked      []string
	banned      []string
	timeouts    map[string]*time.Time
	sent        []*discordgo.MessageSend
	sentTo      []string
	files       map[string]string
	requests    []string // "METHOD url body"
	deletedMsgs []string
	nextID      int
	failEdits   error
	rejectRole  string // edits that assign this role fail, like a role above Velox's
	lookups     int    // member and role lookups, to check harmless entries cost nothing
	closedDMs   map[string]bool
	guildName   string
}

const guild = "100"

func newDiscord() *fakeDiscord {
	return &fakeDiscord{
		ownerID: "1",
		roles: []*discordgo.Role{
			{ID: guild, Name: "@everyone", Position: 0},
			{ID: "200", Name: "Admin", Position: 5, Permissions: discordgo.PermissionAdministrator},
			{ID: "201", Name: "Mod", Position: 3, Permissions: discordgo.PermissionKickMembers},
			{ID: "202", Name: "Member", Position: 1},
			{ID: "203", Name: "Quarantine", Position: 2},
			{ID: "204", Name: "Booster", Position: 1, Managed: true},
			{ID: "299", Name: "Velox", Position: 9, Managed: true, Permissions: discordgo.PermissionAdministrator},
		},
		members: map[string]*discordgo.Member{
			"1":   {User: &discordgo.User{ID: "1", Username: "owner"}},
			"999": {User: &discordgo.User{ID: "999", Username: "velox", Bot: true}, Roles: []string{"299"}},
		},
		users:    map[string]*discordgo.User{},
		channels: map[string]*discordgo.Channel{},
		timeouts: map[string]*time.Time{},
		files:    map[string]string{},
	}
}

func (f *fakeDiscord) addMember(id string, roles ...string) *discordgo.Member {
	f.mu.Lock()
	defer f.mu.Unlock()
	m := &discordgo.Member{User: &discordgo.User{ID: id, Username: "user" + id, Avatar: "a"}, Roles: roles}
	f.members[id] = m
	return m
}

func (f *fakeDiscord) Guild(g string, _ ...discordgo.RequestOption) (*discordgo.Guild, error) {
	return &discordgo.Guild{ID: g, OwnerID: f.ownerID, Name: f.guildName}, nil
}
func (f *fakeDiscord) UserChannelCreate(u string, _ ...discordgo.RequestOption) (*discordgo.Channel, error) {
	f.mu.Lock()
	defer f.mu.Unlock()
	if f.closedDMs[u] {
		return nil, errors.New("Cannot send messages to this user")
	}
	return &discordgo.Channel{ID: "dm-" + u, Type: discordgo.ChannelTypeDM}, nil
}

// dmsTo lists who got a DM, in order.
func (f *fakeDiscord) dmsTo() []string {
	f.mu.Lock()
	defer f.mu.Unlock()
	var out []string
	for _, ch := range f.sentTo {
		if len(ch) > 3 && ch[:3] == "dm-" {
			out = append(out, ch[3:])
		}
	}
	return out
}
func (f *fakeDiscord) User(id string, _ ...discordgo.RequestOption) (*discordgo.User, error) {
	f.mu.Lock()
	defer f.mu.Unlock()
	if u, ok := f.users[id]; ok {
		return u, nil
	}
	return nil, errors.New("unknown user")
}
func (f *fakeDiscord) GuildRoles(string, ...discordgo.RequestOption) ([]*discordgo.Role, error) {
	f.mu.Lock()
	defer f.mu.Unlock()
	f.lookups++
	return f.roles, nil
}
func (f *fakeDiscord) GuildChannels(g string, _ ...discordgo.RequestOption) ([]*discordgo.Channel, error) {
	f.mu.Lock()
	defer f.mu.Unlock()
	var out []*discordgo.Channel
	for _, c := range f.channels {
		if c.GuildID == g {
			out = append(out, c)
		}
	}
	sort.Slice(out, func(i, j int) bool { return out[i].ID < out[j].ID })
	return out, nil
}
func (f *fakeDiscord) GuildMember(_, u string, _ ...discordgo.RequestOption) (*discordgo.Member, error) {
	f.mu.Lock()
	defer f.mu.Unlock()
	f.lookups++
	if m, ok := f.members[u]; ok {
		cp := *m
		cp.Roles = append([]string(nil), m.Roles...)
		return &cp, nil
	}
	return nil, errors.New("unknown member")
}
func (f *fakeDiscord) GuildMemberEdit(_, u string, data *discordgo.GuildMemberParams, _ ...discordgo.RequestOption) (*discordgo.Member, error) {
	f.mu.Lock()
	defer f.mu.Unlock()
	if f.failEdits != nil {
		return nil, f.failEdits
	}
	if data.Roles != nil && f.rejectRole != "" {
		for _, r := range *data.Roles {
			if r == f.rejectRole {
				return nil, errors.New("403 Missing Permissions")
			}
		}
	}
	m, ok := f.members[u]
	if !ok {
		return nil, errors.New("unknown member")
	}
	if data.Roles != nil {
		m.Roles = append([]string(nil), (*data.Roles)...)
	}
	return m, nil
}
func (f *fakeDiscord) GuildMemberTimeout(_, u string, until *time.Time, _ ...discordgo.RequestOption) error {
	f.mu.Lock()
	defer f.mu.Unlock()
	f.timeouts[u] = until
	return nil
}
func (f *fakeDiscord) GuildMemberDeleteWithReason(_, u, _ string, _ ...discordgo.RequestOption) error {
	f.mu.Lock()
	defer f.mu.Unlock()
	f.kicked = append(f.kicked, u)
	delete(f.members, u)
	return nil
}
func (f *fakeDiscord) GuildBanCreateWithReason(_, u, _ string, _ int, _ ...discordgo.RequestOption) error {
	f.mu.Lock()
	defer f.mu.Unlock()
	f.banned = append(f.banned, u)
	delete(f.members, u)
	return nil
}
func (f *fakeDiscord) Channel(id string, _ ...discordgo.RequestOption) (*discordgo.Channel, error) {
	f.mu.Lock()
	defer f.mu.Unlock()
	if c, ok := f.channels[id]; ok {
		cp := *c
		cp.PermissionOverwrites = nil
		for _, o := range c.PermissionOverwrites {
			oc := *o
			cp.PermissionOverwrites = append(cp.PermissionOverwrites, &oc)
		}
		return &cp, nil
	}
	return nil, errors.New("unknown channel")
}
func (f *fakeDiscord) ChannelPermissionSet(ch, target string, t discordgo.PermissionOverwriteType, allow, deny int64, _ ...discordgo.RequestOption) error {
	f.mu.Lock()
	defer f.mu.Unlock()
	c := f.channels[ch]
	for _, o := range c.PermissionOverwrites {
		if o.ID == target {
			o.Allow, o.Deny = allow, deny
			return nil
		}
	}
	c.PermissionOverwrites = append(c.PermissionOverwrites, &discordgo.PermissionOverwrite{ID: target, Type: t, Allow: allow, Deny: deny})
	return nil
}
func (f *fakeDiscord) ChannelPermissionDelete(ch, target string, _ ...discordgo.RequestOption) error {
	f.mu.Lock()
	defer f.mu.Unlock()
	c := f.channels[ch]
	var keep []*discordgo.PermissionOverwrite
	for _, o := range c.PermissionOverwrites {
		if o.ID != target {
			keep = append(keep, o)
		}
	}
	c.PermissionOverwrites = keep
	return nil
}
func (f *fakeDiscord) ChannelMessageSendComplex(ch string, data *discordgo.MessageSend, _ ...discordgo.RequestOption) (*discordgo.Message, error) {
	f.mu.Lock()
	defer f.mu.Unlock()
	f.sentTo = append(f.sentTo, ch)
	for _, file := range data.Files {
		raw, _ := io.ReadAll(file.Reader)
		f.files[file.Name] = string(raw)
	}
	f.sent = append(f.sent, data)
	return &discordgo.Message{ID: "m"}, nil
}
func (f *fakeDiscord) RequestWithBucketID(method, url string, data interface{}, _ string, _ ...discordgo.RequestOption) ([]byte, error) {
	f.mu.Lock()
	defer f.mu.Unlock()
	f.requests = append(f.requests, fmt.Sprintf("%s %s %v", method, url, data))
	return nil, nil
}

// sentCount counts channel alerts (not DMs).
func (f *fakeDiscord) sentCount() int {
	return len(f.channelSends())
}

// channelSends lists messages sent to channels, leaving out DMs.
func (f *fakeDiscord) channelSends() []*discordgo.MessageSend {
	f.mu.Lock()
	defer f.mu.Unlock()
	var out []*discordgo.MessageSend
	for i, m := range f.sent {
		if i >= len(f.sentTo) || len(f.sentTo[i]) < 3 || f.sentTo[i][:3] != "dm-" {
			out = append(out, m)
		}
	}
	return out
}

func (f *fakeDiscord) newID() string {
	f.nextID++
	return fmt.Sprint(8000 + f.nextID)
}
func (f *fakeDiscord) ChannelMessageDelete(ch, msg string, _ ...discordgo.RequestOption) error {
	f.mu.Lock()
	defer f.mu.Unlock()
	f.deletedMsgs = append(f.deletedMsgs, msg)
	return nil
}
func (f *fakeDiscord) GuildRoleCreate(_ string, p *discordgo.RoleParams, _ ...discordgo.RequestOption) (*discordgo.Role, error) {
	f.mu.Lock()
	defer f.mu.Unlock()
	r := &discordgo.Role{ID: f.newID(), Name: p.Name}
	if p.Permissions != nil {
		r.Permissions = *p.Permissions
	}
	f.roles = append(f.roles, r)
	return r, nil
}
func (f *fakeDiscord) GuildRoleEdit(_, roleID string, p *discordgo.RoleParams, _ ...discordgo.RequestOption) (*discordgo.Role, error) {
	f.mu.Lock()
	defer f.mu.Unlock()
	for _, r := range f.roles {
		if r.ID == roleID {
			if p.Permissions != nil {
				r.Permissions = *p.Permissions
			}
			return r, nil
		}
	}
	return nil, errors.New("unknown role")
}
func (f *fakeDiscord) GuildChannelCreateComplex(g string, d discordgo.GuildChannelCreateData, _ ...discordgo.RequestOption) (*discordgo.Channel, error) {
	f.mu.Lock()
	defer f.mu.Unlock()
	c := &discordgo.Channel{ID: f.newID(), GuildID: g, Name: d.Name, Type: d.Type, ParentID: d.ParentID, PermissionOverwrites: d.PermissionOverwrites}
	f.channels[c.ID] = c
	return c, nil
}