package internal

import (
	"context"
	"flag"
	"log"
	"os"
	"path/filepath"
	"strings"
	"time"

	"codeberg.org/snonux/gos/internal/config"
	"codeberg.org/snonux/gos/internal/schedule"
)

// Main is the entry point for the Gos application.
// It parses command-line flags, loads configuration, and starts the main run loop.
// composeModeDefault determines whether the compose mode is enabled by default.
func Main(composeModeDefault bool) {
	// Parse flags
	dry := flag.Bool("dry", false, "Dry run")
	version := flag.Bool("version", false, "Display version")
	composeMode := flag.Bool("compose", composeModeDefault, "Compose a new entry")
	gosDir := flag.String("gosDir", filepath.Join(os.Getenv("HOME"), ".gosdir"), "Gos' queue and DB directory")
	// cacheDir := flag.String("cacheDir", filepath.Join(*gosDir, "cache"), "Go's cache dir")
	browser := flag.String("browser", "firefox", "OAuth2 browser")
	configPath := flag.String("configPath", filepath.Join(os.Getenv("HOME"), ".config/gos/gos.json"), "Gos' config file path")
	platforms := flag.String("platforms", "Mastodon:500,LinkedIn:1000,Noop:2000", "Platforms enabled plus their post size limits")
	target := flag.Int("target", 2, "How many posts per week are the target?")
	minQueued := flag.Int("minQueued", 42, "Minimum of queued items until printing a warn message!")
	maxDaysQueued := flag.Int("maxDaysQueued", 365*2, "Maximum days worth of queued posts until target++ and pauseDays--")
	pauseDays := flag.Int("pauseDays", 2, "How many days until next post can be posted?")
	runInterval := flag.Int("runInterval", 6, "How many hours to wait for the next run.")
	lookback := flag.Int("lookback", 42, "How many days look back in time for posting history")
	geminiSummaryFor := flag.String("geminiSummaryFor", "", "Generate a summary in Gemini Gemtext format, format is coma separated string of months, e.g. 202410,202411")
	geminiCapsules := flag.String("geminiCapsules", "foo.zone", "Comma separated list Gemini capsules. Used by geminiEnable to detect Gemtext links")
	gemtexterEnable := flag.Bool("gemtexterEnable", false, "Add special Gemtexter (the static site generator) tags to the Gemini Gemtext summary")
	statsOnly := flag.Bool("stats", false, "Print statistics for all social networks and exit")

	flag.Parse()

	// Handle version flag
	if *version {
		printVersion()
		return
	}

	// Create args from parsed flags
	args := config.Args{
		DryRun:          *dry,
		GosDir:          *gosDir,
		Target:          *target,
		MinQueued:       *minQueued,
		MaxDaysQueued:   *maxDaysQueued,
		PauseDays:       *pauseDays,
		RunInterval:     time.Duration(*runInterval) * time.Hour, // TODO: Document
		Lookback:        time.Duration(*lookback) * time.Hour * 24,
		ConfigPath:      *configPath,
		OAuth2Browser:   *browser,
		GemtexterEnable: *gemtexterEnable,
		GeminiCapsules:  strings.Split(*geminiCapsules, ","),
		ComposeMode:     *composeMode,
		StatsOnly:       *statsOnly,
	}
	if *geminiSummaryFor != "" {
		args.GeminiSummaryFor = strings.Split(*geminiSummaryFor, ",")
	}

	// Load configuration
	conf, err := config.New(args.ConfigPath, args.ComposeMode)
	if err != nil {
		log.Fatal(err)
	}
	args.Config = conf

	// Parse platforms
	if err := args.ParsePlatforms(*platforms); err != nil {
		log.Fatal(err)
	}

	// Handle stats only flag
	if args.StatsOnly {
		// Call the new function to print all stats
		schedule.PrintAllStats(args)
		return // Exit after printing stats
	}

	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()

	if err := run(ctx, args); err != nil {
		log.Fatal(err)
	}
}