package applog

import (
	"io"
	"log/slog"

	"gitea.auvem.com/go-toolkit/app"
)

// ModuleName is the name of the module provided by applog.
const ModuleName = "app logger"

// AppLogOpts contains options for configuring the application logger.
type AppLogOpts struct {
	// ConsoleOutput is the writer for pretty-printed console logs. If nil,
	// console output is disabled. Generally recommended to set this to
	// os.Stderr, leaving os.Stdout for application output (usually via
	// fmt.Print*).
	ConsoleOutput io.Writer

	// ConsoleLevel is the minimum log level for console output. Defaults to
	// slog.LevelInfo when console output is enabled.
	ConsoleLevel slog.Level

	// FileOutput is the path to a file where JSON formatted logs will be
	// written. If empty, file output is disabled.
	FileOutput string

	// FileLevel is the minimum log level for file output. Defaults to
	// slog.LevelInfo when file output is enabled.
	FileLevel slog.Level

	// SetDefault sets slog.SetDefault to the configured logger.
	SetDefault bool

	// DisableAnnouncement skips the startup log line after initialization.
	DisableAnnouncement bool
}

// Module returns an app module that configures slog for the lifecycle.
func (opts AppLogOpts) Module() *app.Module {
	state := &moduleState{opts: opts}
	return app.NewModule(ModuleName, app.ModuleOpts{
		Setup: func(m *app.Module) error {
			return state.setup(m)
		},
		Teardown: func(m *app.Module) error {
			return state.teardown(m.Lifecycle())
		},
	})
}