package main

import (
    "fmt"
    "github.com/pubgo/dix/v2"
)

type Config struct {
    DSN string
}

type Database struct {
    Config *Config
}

type UserService struct {
    DB *Database
}

func main() {
    // Create container
    di := dix.New()

    // Register Providers
    dix.Provide(di, func() *Config {
        return &Config{DSN: "postgres://localhost/mydb"}
    })

    dix.Provide(di, func(c *Config) *Database {
        return &Database{Config: c}
    })

    dix.Provide(di, func(db *Database) *UserService {
        return &UserService{DB: db}
    })

    // Inject and use
    dix.Inject(di, func(svc *UserService) {
        fmt.Println("DSN:", svc.DB.Config.DSN)
    })
}

if err := dix.TryProvide(di, NewDatabase); err != nil {
    log.Fatal(err)
}
if err := dix.TryInject(di, Run); err != nil {
    log.Fatal(err)
}

// Standard version - panics on error
dix.Provide(di, func() *Service { return &Service{} })

// Safe version - returns error
err := dix.TryProvide(di, func() *Service { return &Service{} })
if err != nil {
    log.Printf("Registration failed: %v", err)
}

// Function injection
dix.Inject(di, func(svc *Service) {
    svc.DoSomething()
})

// Struct injection
type App struct {
    Service *Service
    Config  *Config
}
app := &App{}
dix.Inject(di, app)

// Safe version
err := dix.TryInject(di, func(svc *Service) {
    // ...
})

// Inject into a new struct value
app := dix.InjectT[App](di)

// Inject with request-scoped trace context
err := dix.TryInjectContext(ctx, di, func(svc *Service) {
    svc.DoSomething()
})

di := dix.New(
    dix.WithProviderTimeout(2*time.Second),              // default: 15s; 0 disables
    dix.WithSlowProviderThreshold(300*time.Millisecond), // default: 2s; 0 disables
)

type In struct {
    Config   *Config
    Database *Database
}

type Out struct {
    UserSvc  *UserService
    OrderSvc *OrderService
}

// Multiple inputs and outputs
dix.Provide(di, func(in In) Out {
    return Out{
        UserSvc:  &UserService{DB: in.Database},
        OrderSvc: &OrderService{DB: in.Database},
    }
})

// Provide with namespace
dix.Provide(di, func() map[string]*Database {
    return map[string]*Database{
        "master": &Database{DSN: "master-dsn"},
        "slave":  &Database{DSN: "slave-dsn"},
    }
})

// Inject specific namespace
dix.Inject(di, func(dbs map[string]*Database) {
    master := dbs["master"]
    slave := dbs["slave"]
})

// Provide same type multiple times
dix.Provide(di, func() []Handler {
    return []Handler{&AuthHandler{}}
})
dix.Provide(di, func() []Handler {
    return []Handler{&LogHandler{}}
})

// Inject all
dix.Inject(di, func(handlers []Handler) {
    // handlers contains AuthHandler and LogHandler
})

import "github.com/pubgo/dix/v2/dixglobal"

// Use directly without creating container
dixglobal.Provide(func() *Config { return &Config{} })
dixglobal.Inject(func(c *Config) { /* ... */ })

import "github.com/pubgo/dix/v2/dixcontext"

// Store in context
ctx := dixcontext.Create(context.Background(), di)

// Retrieve and use
container := dixcontext.Get(ctx)

// Non-panicking lookup
container = dixcontext.GetOrNil(ctx)

import (
    "github.com/pubgo/dix/v2/dixhttp"
    "github.com/pubgo/dix/v2/dixinternal"
)

server := dixhttp.NewServer((*dixinternal.Dix)(di))
server.ListenAndServe(":8080")