refactor: modularize downloader architecture

config.go

@@ -0,0 +1,89 @@
+package main
+
+import (
+	"os"
+	"path/filepath"
+	"strconv"
+	"strings"
+
+	"gorm.io/gorm"
+)
+
+func (a *App) loadSettings() {
+	var ss []Setting
+	a.db.Find(&ss)
+	for _, s := range ss {
+		switch s.Key {
+		case "am_api":
+			a.cfg.AMAPI = s.Value
+		case "download_dir":
+			a.cfg.DownloadDir = s.Value
+		case "webdav_url":
+			a.cfg.WebDAVURL = s.Value
+		case "webdav_user":
+			a.cfg.WebDAVUser = s.Value
+		case "webdav_pass":
+			a.cfg.WebDAVPass = s.Value
+		case "webdav_path":
+			a.cfg.WebDAVPath = s.Value
+		case "quality":
+			a.cfg.DefaultQuality = s.Value
+		case "webdav_version_policy":
+			a.cfg.WebDAVVersionPolicy = s.Value
+		case "local_file_policy":
+			a.cfg.LocalFilePolicy = s.Value
+		}
+	}
+}
+
+func (a *App) saveSetting(k, v string) {
+	var s Setting
+	if a.db.Where("key = ?", k).First(&s).Error != nil {
+		a.db.Create(&Setting{Key: k, Value: v})
+	} else {
+		s.Value = v
+		a.db.Save(&s)
+	}
+}
+
+func loadConfig(db *gorm.DB) Config {
+	cfg := Config{
+		AMAPI:          getenv("AM_API_URL", "http://127.0.0.1:9530/api"),
+		DownloadDir:    getenv("DOWNLOAD_DIR", "/downloads"),
+		DefaultQuality: getenv("DEFAULT_QUALITY", "standard"),
+		WorkerCount:    atoi(getenv("WORKERS", "2"), 2),
+	}
+	_ = db
+	return cfg
+}
+
+func normalizeConfig(cfg *Config) {
+	if cfg.WorkerCount < 1 {
+		cfg.WorkerCount = 1
+	}
+	if cfg.WebDAVVersionPolicy != "keep" && cfg.WebDAVVersionPolicy != "replace_lower" {
+		cfg.WebDAVVersionPolicy = "keep"
+	}
+	if cfg.LocalFilePolicy != "keep" && cfg.LocalFilePolicy != "delete_after_upload" {
+		cfg.LocalFilePolicy = "keep"
+	}
+	cfg.WebDAVPath = strings.Trim(cfg.WebDAVPath, "/")
+	_ = os.MkdirAll(cfg.DownloadDir, 0755)
+}
+
+func getenv(k, d string) string {
+	if v := os.Getenv(k); v != "" {
+		return v
+	}
+	return d
+}
+
+func atoi(s string, d int) int {
+	v, e := strconv.Atoi(s)
+	if e != nil || v < 1 {
+		return d
+	}
+	return v
+}
+
+func dbDir(path string) string { return filepath.Dir(path) }