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// SPDX-FileCopyrightText: 2025 Shota FUJI <pockawoooh@gmail.com>
// SPDX-License-Identifier: AGPL-3.0-only

//go:build !js && !wasm

package main

import (
	"database/sql"
	_ "embed"
	"fmt"
	"log/slog"
	"net/http"
	"os"
	"strings"

	"github.com/alecthomas/kong"
	"github.com/charmbracelet/lipgloss"
	charmlog "github.com/charmbracelet/log"
	"golang.org/x/net/http2"
	"golang.org/x/net/http2/h2c"
	"pocka.jp/x/yamori/backend/core"
	"pocka.jp/x/yamori/backend/services"

	_ "modernc.org/sqlite"
)

// charmbracelet/log のデフォルトスタイルは見づらく 256 bit 色を利用しているため
// ユーザのターミナルパレットを無視した色で出力する。
// この関数はそれをなるべく一般的な色付き CLI の出力にしたロガーを返す。
func charmLogger(options charmlog.Options) *slog.Logger {
	styles := charmlog.DefaultStyles()
	styles.Levels = map[charmlog.Level]lipgloss.Style{
		charmlog.DebugLevel: lipgloss.NewStyle().
			SetString(strings.ToUpper(charmlog.DebugLevel.String())).
			Bold(true).
			Width(5).
			Foreground(lipgloss.ANSIColor(7)),
		charmlog.InfoLevel: lipgloss.NewStyle().
			SetString(strings.ToUpper(charmlog.InfoLevel.String())).
			Bold(true).
			Width(5).
			Foreground(lipgloss.ANSIColor(4)),
		charmlog.WarnLevel: lipgloss.NewStyle().
			SetString(strings.ToUpper(charmlog.WarnLevel.String())).
			Bold(true).
			Width(5).
			Foreground(lipgloss.ANSIColor(3)),
		charmlog.ErrorLevel: lipgloss.NewStyle().
			SetString(strings.ToUpper(charmlog.ErrorLevel.String())).
			Bold(true).
			Width(5).
			Foreground(lipgloss.ANSIColor(1)),
		charmlog.FatalLevel: lipgloss.NewStyle().
			SetString(strings.ToUpper(charmlog.FatalLevel.String())).
			Bold(true).
			Width(5).
			Foreground(lipgloss.ANSIColor(1)),
	}
	styles.Timestamp = lipgloss.NewStyle().
		Foreground(lipgloss.Color("7"))
	styles.Key = lipgloss.NewStyle().Foreground(lipgloss.ANSIColor(2))
	styles.Separator = lipgloss.NewStyle().Foreground(lipgloss.ANSIColor(7))
	styles.Value = lipgloss.NewStyle().Foreground(lipgloss.ANSIColor(5))

	logger := charmlog.NewWithOptions(os.Stdout, options)
	logger.SetStyles(styles)

	return slog.New(logger)
}

var cli struct {
	Help                  bool   `short:"?" help:"Show this message to stdout and exit."`
	AdminCreationPassword string `help:"Password for creating a user when there is no admin user in workspace"`
	OverwriteJwtSecret    bool   `help:"Generate a new JWT signing secret even if there is a configured one"`
	Verbose               bool   `help:"Display debug logs?"`
	Log                   string `help:"Log format." enum:"text,jsonl" default:"text"`
	Port                  uint   `short:"p" help:"TCP port to bind." default:"8765"`
	Host                  string `short:"h" help:"Network host to bind. Not including port." default:"localhost"`
}

const (
	exit_ok = iota
	exit_err
	exit_db_err
	exit_core_init_err
	exit_http_server_err
)

func run() int {
	ctx := kong.Parse(&cli, kong.NoDefaultHelp())

	if cli.Help {
		kong.DefaultHelpPrinter(kong.HelpOptions{}, ctx)
		return exit_ok
	}

	logLevel := slog.LevelInfo
	if cli.Verbose {
		logLevel = slog.LevelDebug
	}

	var logger *slog.Logger
	if cli.Log == "jsonl" {
		logger = slog.New(slog.NewJSONHandler(os.Stdout, &slog.HandlerOptions{
			Level: logLevel,
		}))
	} else {
		logger = charmLogger(charmlog.Options{
			ReportTimestamp: true,
			Level:           charmlog.Level(logLevel),
		})
	}

	db, err := sql.Open("sqlite", ":memory:")
	if err != nil {
		logger.Error("Failed to open database", "error", err)
		return exit_db_err
	}
	defer db.Close()

	core, err := core.New(db, logger)
	if err != nil {
		logger.Error("Failed to create core instance", "error", err)
		return exit_core_init_err
	}

	if err := core.Init(cli.AdminCreationPassword, cli.OverwriteJwtSecret); err != nil {
		logger.Error("Failed to prepare application core", "error", err)
		return exit_core_init_err
	}

	mux := services.Mux(core)

	addr := fmt.Sprintf("%s:%d", cli.Host, cli.Port)
	logger.Info("Starting HTTP server", "address", fmt.Sprintf("http://%s", addr))
	if err := http.ListenAndServe(addr, h2c.NewHandler(mux, &http2.Server{})); err != nil {
		logger.Error("Failed to listen and server", "error", err)
		return exit_http_server_err
	}

	return exit_ok
}

func main() {
	os.Exit(run())
}