package main

import (
	"fmt"
	"strconv"
	"strings"

	"streamrip-go/internal/config"
)

type smokeOptions struct {
	qualitySet bool
	quality    int
	ignoreDB   bool
}

type globalOptions struct {
	configPath  string
	folder      string
	noDB        bool
	qualitySet  bool
	quality     int
	codecSet    bool
	codec       string
	noProgress  bool
	noSSLVerify bool
	verbose     bool
	command     string
	commandArgs []string
}

func parseGlobalArgs(args []string) (globalOptions, error) {
	opts := globalOptions{}
	for i := 0; i < len(args); i++ {
		arg := args[i]
		if arg == "" {
			continue
		}
		if !strings.HasPrefix(arg, "-") {
			opts.command = arg
			if i+1 < len(args) {
				opts.commandArgs = append([]string(nil), args[i+1:]...)
			}
			return opts, nil
		}

		switch {
		case arg == "-ndb" || arg == "--no-db":
			opts.noDB = true
		case arg == "--no-progress":
			opts.noProgress = true
		case arg == "--no-ssl-verify":
			opts.noSSLVerify = true
		case arg == "-v" || arg == "--verbose":
			opts.verbose = true
		case arg == "-f" || arg == "--folder":
			if i+1 >= len(args) {
				return globalOptions{}, fmt.Errorf("%s requires a value", arg)
			}
			opts.folder = strings.TrimSpace(args[i+1])
			i++
		case strings.HasPrefix(arg, "--folder="):
			opts.folder = strings.TrimSpace(strings.TrimPrefix(arg, "--folder="))
		case arg == "--config-path":
			if i+1 >= len(args) {
				return globalOptions{}, fmt.Errorf("--config-path requires a value")
			}
			opts.configPath = strings.TrimSpace(args[i+1])
			i++
		case strings.HasPrefix(arg, "--config-path="):
			opts.configPath = strings.TrimSpace(strings.TrimPrefix(arg, "--config-path="))
		case arg == "-q" || arg == "--quality":
			if i+1 >= len(args) {
				return globalOptions{}, fmt.Errorf("%s requires a value", arg)
			}
			q, err := strconv.Atoi(args[i+1])
			if err != nil || q < 0 || q > 4 {
				return globalOptions{}, fmt.Errorf("invalid quality %q (expected 0-4)", args[i+1])
			}
			opts.qualitySet = true
			opts.quality = q
			i++
		case strings.HasPrefix(arg, "--quality="):
			qRaw := strings.TrimSpace(strings.TrimPrefix(arg, "--quality="))
			q, err := strconv.Atoi(qRaw)
			if err != nil || q < 0 || q > 4 {
				return globalOptions{}, fmt.Errorf("invalid quality %q (expected 0-4)", qRaw)
			}
			opts.qualitySet = true
			opts.quality = q
		case arg == "-c" || arg == "--codec":
			if i+1 >= len(args) {
				return globalOptions{}, fmt.Errorf("%s requires a value", arg)
			}
			codec, err := normalizeCodec(args[i+1])
			if err != nil {
				return globalOptions{}, err
			}
			opts.codecSet = true
			opts.codec = codec
			i++
		case strings.HasPrefix(arg, "--codec="):
			codecRaw := strings.TrimSpace(strings.TrimPrefix(arg, "--codec="))
			codec, err := normalizeCodec(codecRaw)
			if err != nil {
				return globalOptions{}, err
			}
			opts.codecSet = true
			opts.codec = codec
		default:
			return globalOptions{}, fmt.Errorf("unknown global option %q", arg)
		}
	}
	return opts, nil
}

func normalizeCodec(raw string) (string, error) {
	codec := strings.ToUpper(strings.TrimSpace(raw))
	switch codec {
	case "ALAC", "FLAC", "MP3", "AAC", "VORBIS":
		return codec, nil
	case "OGG":
		return "VORBIS", nil
	default:
		return "", fmt.Errorf("unsupported codec %q (expected ALAC, FLAC, OGG, MP3, AAC)", raw)
	}
}

func applyGlobalConfigOverrides(cfg *config.Config, opts globalOptions) {
	if opts.folder != "" {
		cfg.Session.Downloads.Folder = opts.folder
	}
	if opts.noDB {
		cfg.Session.Database.DownloadsEnabled = false
	}
	if opts.qualitySet {
		cfg.Session.Qobuz.Quality = opts.quality
		cfg.Session.Tidal.Quality = opts.quality
		cfg.Session.Deezer.Quality = opts.quality
		cfg.Session.Soundcloud.Quality = opts.quality
	}
	if opts.codecSet {
		cfg.Session.Conversion.Enabled = true
		cfg.Session.Conversion.Codec = opts.codec
	}
	if opts.noProgress {
		cfg.Session.CLI.ProgressBars = false
	}
	if opts.noSSLVerify {
		cfg.Session.Downloads.VerifySSL = false
	}
}

func errorWithActionableHint(err error, opts globalOptions) string {
	if err == nil {
		return ""
	}
	msg := err.Error()
	if opts.noSSLVerify {
		return msg
	}
	lower := strings.ToLower(msg)
	if strings.Contains(lower, "x509") || strings.Contains(lower, "certificate") || strings.Contains(lower, "tls") || strings.Contains(lower, "ssl") {
		return msg + " (hint: try again with --no-ssl-verify)"
	}
	return msg
}

func parseSmokeOptions(args []string, minQuality int, maxQuality int) (smokeOptions, error) {
	opts := smokeOptions{}
	for _, arg := range args {
		switch arg {
		case "--force", "--ignore-db":
			opts.ignoreDB = true
		default:
			q, err := parseQuality(arg, minQuality, maxQuality)
			if err != nil {
				return smokeOptions{}, fmt.Errorf("unknown option %q", arg)
			}
			opts.quality = q
			opts.qualitySet = true
		}
	}
	return opts, nil
}

func parseQuality(raw string, min int, max int) (int, error) {
	q, err := strconv.Atoi(raw)
	if err != nil {
		return 0, err
	}
	if q < min || q > max {
		return 0, fmt.Errorf("quality must be %d-%d, got %d", min, max, q)
	}
	return q, nil
}

func asString(v any) string {
	switch t := v.(type) {
	case string:
		return t
	case int:
		return strconv.Itoa(t)
	case int64:
		return strconv.FormatInt(t, 10)
	case float64:
		return strconv.FormatFloat(t, 'f', -1, 64)
	default:
		return ""
	}
}