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README.md

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+# NaviMigrate
+
+Spotify -> Navidrome playlist transfer tool in Go.
+
+## What it does
+
+- Authenticates with Spotify using Authorization Code + PKCE (no client secret required).
+- Fetches one or more Spotify playlists by URL/URI/ID.
+- Searches for matching tracks in Navidrome using Subsonic `search3`.
+- Creates matching playlists in Navidrome and adds matched tracks.
+- Writes a JSON transfer report with unmatched tracks and errors.
+
+## Requirements
+
+- Go 1.22+
+- Spotify app client ID with redirect URI configured (default: `http://127.0.0.1:8888/callback`)
+- Navidrome URL, username, and password
+
+## Build
+
+```bash
+go build ./cmd/navimigrate
+```
+
+## Usage
+
+```bash
+./navimigrate \
+  --spotify-client-id "<spotify-client-id>" \
+  --navidrome-url "https://music.lofitrek.com" \
+  --navidrome-username "test_user" \
+  --navidrome-password "test_user" \
+  --playlist-url "https://open.spotify.com/playlist/16DZpOTLqZvdbqxEavLmWk"
+```
+
+### Useful flags
+
+- `--playlist-url "..."` (repeatable): Spotify playlist URL/URI/ID
+- `--dry-run`: resolve matches only, do not create playlists or add tracks
+- `--report transfer-report.json`: report output path
+- `--concurrency 4`: concurrent track match workers
+- `--spotify-manual-code=true|false`: manual callback URL/code entry or local callback server
+
+### Navidrome self-test
+
+Quick auth/search test without Spotify:
+
+```bash
+./navimigrate \
+  --navidrome-url "https://music.lofitrek.com" \
+  --navidrome-username "test_user" \
+  --navidrome-password "test_user" \
+  --navidrome-self-test
+```
+
+Write-path self-test (creates playlist, adds one track, then deletes playlist):
+
+```bash
+./navimigrate \
+  --navidrome-url "https://music.lofitrek.com" \
+  --navidrome-username "test_user" \
+  --navidrome-password "test_user" \
+  --navidrome-self-test \
+  --navidrome-self-test-write
+```
+
+### Environment variables
+
+- `SPOTIFY_CLIENT_ID`
+- `SPOTIFY_REDIRECT_URI` (optional)
+- `SPOTIFY_SCOPES` (optional)
+- `NAVIMIGRATE_SPOTIFY_MANUAL_CODE` (optional, defaults to true)
+- `NAVIDROME_URL`
+- `NAVIDROME_USERNAME`
+- `NAVIDROME_PASSWORD`
+- `NAVIMIGRATE_DRY_RUN` (optional)
+- `NAVIMIGRATE_CONCURRENCY` (optional)
+- `NAVIMIGRATE_REPORT` (optional)
+- `NAVIMIGRATE_NAVIDROME_SELF_TEST` (optional)
+- `NAVIMIGRATE_NAVIDROME_SELF_TEST_WRITE` (optional)
+- `NAVIMIGRATE_NAVIDROME_SELF_TEST_QUERY` (optional)