package user

import (
	"context"
	"database/sql"
	"embed"
	"io/fs"
	"log/slog"
	"net/http"
	"strings"
	"time"

	"git.golem15.com/golem15/fonoteka/plugins/golem15/user/classes"
	"git.golem15.com/golem15/fonoteka/plugins/golem15/user/console"
	"git.golem15.com/golem15/fonoteka/plugins/golem15/user/models"
	"git.golem15.com/golem15/fonoteka/plugins/golem15/user/updates"
	"git.golem15.com/golem15/summercms/modules/backpack"
	"git.golem15.com/golem15/summercms/modules/bonfire"
	"git.golem15.com/golem15/summercms/modules/bouncer"
	"git.golem15.com/golem15/summercms/modules/pact"
	"git.golem15.com/golem15/summercms/modules/party"
	"git.golem15.com/golem15/summercms/modules/surf"
	"github.com/go-gormigrate/gormigrate/v2"
	"gorm.io/gorm"
)

var (
	_ party.Plugin          = (*Plugin)(nil)
	_ pact.HasConfig        = (*Plugin)(nil)
	_ pact.HasMigrations    = (*Plugin)(nil)
	_ pact.HasMiddleware    = (*Plugin)(nil)
	_ pact.HasModels        = (*Plugin)(nil)
	_ pact.HasRoutes        = (*Plugin)(nil)
	_ pact.HasMailTemplates = (*Plugin)(nil)
	_ pact.HasLang          = (*Plugin)(nil)
	_ pact.HasCommands      = (*Plugin)(nil)
	_ surf.BucketProvider   = (*Plugin)(nil)
	_ bouncer.UserProvider  = classes.GormUsers{}
)

//go:embed config
var configFS embed.FS

//go:embed views/mail
var mailFS embed.FS

//go:embed lang
var langFS embed.FS

// Plugin is the golem15.user plugin.
type Plugin struct {
	app       *backpack.App
	sweepStop chan struct{}
}

func (p *Plugin) ID() string         { return "golem15.user" }
func (p *Plugin) Requires() []string { return nil }

func (p *Plugin) Register(app *backpack.App) error {
	p.app = app
	return nil
}

func (p *Plugin) Boot(app *backpack.App) error {
	p.app = app
	secret, err := classes.JWTSecret(app)
	if err != nil {
		return err
	}
	if gdb, ok := app.Lookup[*gorm.DB](); ok {
		if err := classes.RegisterHooks(gdb); err != nil {
			return err
		}
	}
	reg, ok := app.Lookup[*bouncer.Registry]()
	if !ok || reg == nil {
		reg = bouncer.NewRegistry()
		if err := app.Publish(reg); err != nil {
			return err
		}
	}
	var bl bouncer.BlacklistStore
	if sqlDB, ok := app.Lookup[*sql.DB](); ok && sqlDB != nil {
		bl = bouncer.NewPostgresBlacklist(sqlDB, "jwt_blacklist")
	} else if gdb, ok := app.Lookup[*gorm.DB](); ok && gdb != nil {
		if sqlDB, err := gdb.DB(); err == nil && sqlDB != nil {
			bl = bouncer.NewPostgresBlacklist(sqlDB, "jwt_blacklist")
		}
	}
	if bl != nil {
		if err := app.Publish[bouncer.BlacklistStore](bl); err != nil {
			return err
		}
		p.startBlacklistSweep(bl)
	}
	return reg.Register(p.ID(), "jwt", bouncer.NewJWTGuard(secret, classes.GormUsers{App: app}, bl, "token", "auth_token"))
}

func (p *Plugin) startBlacklistSweep(bl bouncer.BlacklistStore) {
	interval := 10 * time.Minute
	if p.app != nil && p.app.Config != nil {
		raw := p.app.Config.String("golem15.user.jwt.blacklist_sweep_interval")
		if raw != "" {
			parsed, err := time.ParseDuration(raw)
			if err != nil || parsed <= 0 {
				return
			}
			interval = parsed
		}
	}
	if p.sweepStop != nil {
		return
	}
	p.sweepStop = make(chan struct{})
	stop := p.sweepStop
	go func() {
		ticker := time.NewTicker(interval)
		defer ticker.Stop()
		for {
			select {
			case <-ticker.C:
				if err := bl.Sweep(context.Background(), time.Now()); err != nil {
					slog.Default().Error("golem15.user: jwt blacklist sweep", "err", err)
				}
			case <-stop:
				return
			}
		}
	}()
}

func (p *Plugin) Buckets() map[string]surf.Bucket {
	trusted := surf.TrustedProxies(nil)
	if p.app != nil {
		trusted = surf.TrustedProxies(p.app.Config)
	}
	secret := ""
	if p.app != nil {
		secret, _ = classes.JWTSecret(p.app)
	}
	return map[string]surf.Bucket{
		"user-api": {
			Max:   120,
			Decay: time.Minute,
			Key: func(r *http.Request) string {
				if sub, err := bouncer.Verify(bearerFrom(r), secret); err == nil {
					return "u:" + sub
				}
				return surf.ClientIP(r, trusted)
			},
		},
	}
}

func bearerFrom(r *http.Request) string {
	h := strings.TrimSpace(r.Header.Get("Authorization"))
	token, ok := strings.CutPrefix(h, "Bearer ")
	token = strings.TrimSpace(token)
	if !ok || token == "" {
		return ""
	}
	return token
}

func (p *Plugin) ConfigFS() fs.FS { return configFS }

func (p *Plugin) LangFS() fs.FS { return langFS }

func (p *Plugin) MailTemplatesFS() fs.FS { return mailFS }

func (p *Plugin) MailTemplates() []string {
	return []string{
		"golem15.user::mail.activate",
		"golem15.user::mail.activate-en",
		"golem15.user::mail.restore",
		"golem15.user::mail.restore-en",
		"golem15.user::mail.reactivate",
		"golem15.user::mail.reactivate-en",
	}
}

func (p *Plugin) MailLayouts() map[string]string {
	return map[string]string{
		"user": "golem15.user::mail.layouts.user",
	}
}

func (p *Plugin) Commands() []bonfire.Command {
	return []bonfire.Command{console.RequirePasswordChange(p.app)}
}

func (p *Plugin) Migrations() []*gormigrate.Migration { return updates.All() }

func (p *Plugin) Models() []any { return models.All() }

func (p *Plugin) Middlewares() map[string]pact.Middleware {
	if p.app == nil {
		return nil
	}
	reg, ok := p.app.Lookup[*bouncer.Registry]()
	if !ok || reg == nil {
		return nil
	}
	mw, err := reg.Middleware("jwt")
	if err != nil {
		return nil
	}
	return map[string]pact.Middleware{"jwt.auth": mw}
}

func init() {
	party.Register(&Plugin{})
}