package main

import (
	"os"
	"path/filepath"
	"strings"
)

func (a *App) upload(t *Task) {
	if t.RemotePath != "" && t.Status == "done" {
		return
	}
	storage, root, enabled := a.storageForTask(t)
	if !enabled || storage == nil || root == "" {
		if t.Status == "upload_pending" {
			if err := a.db.Model(t).Updates(map[string]any{
				"status": "done", "error": "",
			}).Error; err != nil {
				return
			}
			t.Status, t.Error = "done", ""
		}
		return
	}
	if !a.claimUpload(t) {
		return
	}
	remote := strings.TrimRight(root, "/") + "/" + safe(t.Artist) + "/" +
		safe(t.Album) + "/" + safe(t.Title) + "." + safe(t.Format)
	if err := storage.MkdirAll(filepath.ToSlash(filepath.Dir(remote))); err != nil {
		a.failUpload(t, err)
		return
	}
	fi, statErr := os.Stat(t.LocalPath)
	if statErr != nil {
		if a.recoverMissingLocalUpload(t) {
			return
		}
		a.failUpload(t, statErr)
		return
	}
	if same, _ := storage.ExistsSameSize(remote, fi.Size()); same {
		t.RemotePath = remote
		t.Status, t.Progress, t.Error = "done", 100, ""
		_ = a.db.Model(t).Updates(map[string]any{
			"remote_path": remote, "status": "done",
			"progress": 100, "error": "",
		}).Error
		a.cleanupLocalFile(t)
		return
	}
	if err := storage.Upload(t.LocalPath, remote); err != nil {
		a.failUpload(t, err)
		return
	}
	t.RemotePath = remote
	t.Status, t.Progress, t.Error = "done", 100, ""
	if err := a.db.Model(t).Updates(map[string]any{
		"remote_path": remote, "status": "done",
		"progress": 100, "error": "",
	}).Error; err != nil {
		return
	}
	if a.cfg.WebDAVVersionPolicy == "replace_lower" {
		a.cleanupLowerQualityVersions(t, storage)
	}
	a.cleanupLocalFile(t)
}

func (a *App) cleanupLocalFile(t *Task) {
	if a.cfg.LocalFilePolicy != "delete_after_upload" || t.LocalPath == "" {
		return
	}
	if t.AssetID != 0 {
		var pending int64
		if err := a.db.Model(&Task{}).
			Where("asset_id = ? AND id <> ? AND local_path = ? AND "+
				"(status IN ? OR (status = ? AND (remote_path = '' OR remote_path IS NULL)))",
				t.AssetID, t.ID, t.LocalPath,
				[]string{"pending", "resolving", "downloading", "uploading", "upload_pending"},
				"done").Count(&pending).Error; err != nil {
			return
		}
		if pending > 0 {
			return
		}
	}

	if err := os.Remove(t.LocalPath); err != nil && !os.IsNotExist(err) {
		t.Error = "WebDAV 上传成功，但删除本地文件失败: " + err.Error()
		_ = a.db.Save(t)
		return
	}
	if t.AssetID != 0 {
		_ = a.db.Model(&MediaAsset{}).
			Where("id = ? AND local_path = ?", t.AssetID, t.LocalPath).
			Updates(map[string]any{
				"status": "evicted", "local_path": "",
				"size": 0, "owner_task_id": 0, "lease_until": nil,
			}).Error
	}
}

func (a *App) cleanupLowerQualityVersions(t *Task, storage RemoteStorage) {
	levels := map[string]int{"standard": 1, "exhigh": 2, "sq": 3,
		"lossless": 4, "hires": 5, "jyeffect": 6, "sky": 7,
		"jymaster": 8, "atmos": 9, "atmos_plus": 10, "master": 11}
	current := qualityRank(levels, t.ActualQuality, t.ResolvedQuality, t.Quality)
	if current == 0 {
		return
	}
	var old []Task
	a.db.Where("user_id = ? AND artist = ? AND title = ? AND album = ? "+
		"AND status = ? AND id <> ?", t.UserID, t.Artist, t.Title, t.Album, "done", t.ID).Find(&old)
	for _, candidate := range old {
		q := qualityRank(levels, candidate.ActualQuality, candidate.ResolvedQuality, candidate.Quality)
		if q == 0 || q >= current || candidate.RemotePath == "" || candidate.RemotePath == t.RemotePath {
			continue
		}
		_ = storage.Remove(candidate.RemotePath)
	}
}

func qualityRank(levels map[string]int, values ...string) int {
	for _, q := range values {
		if n := levels[q]; n > 0 {
			return n
		}
	}
	return 0
}