-- Migration 001: Initial Vaultik schema
-- All core tables for tracking files, chunks, blobs, snapshots, and uploads.

-- Files table: stores metadata about files in the filesystem
CREATE TABLE IF NOT EXISTS files (
    id TEXT PRIMARY KEY,  -- UUID
    path TEXT NOT NULL UNIQUE,
    source_path TEXT NOT NULL DEFAULT '',  -- The source directory this file came from
    mtime INTEGER NOT NULL,  -- whole seconds since the Unix epoch
    mtime_nsec INTEGER NOT NULL,  -- nanoseconds within that second, 0 to 999999999
    size INTEGER NOT NULL,
    mode INTEGER NOT NULL,
    uid INTEGER NOT NULL,
    gid INTEGER NOT NULL,
    link_target TEXT
);

-- Create index on path for efficient lookups
CREATE INDEX IF NOT EXISTS idx_files_path ON files(path);

-- File chunks table: maps files to their constituent chunks
CREATE TABLE IF NOT EXISTS file_chunks (
    file_id TEXT NOT NULL,
    idx INTEGER NOT NULL,
    chunk_hash TEXT NOT NULL,
    PRIMARY KEY (file_id, idx),
    FOREIGN KEY (file_id) REFERENCES files(id) ON DELETE CASCADE,
    FOREIGN KEY (chunk_hash) REFERENCES chunks(chunk_hash)
);

-- Index for efficient chunk lookups (used in orphan detection)
CREATE INDEX IF NOT EXISTS idx_file_chunks_chunk_hash ON file_chunks(chunk_hash);

-- Chunks table: stores unique content-defined chunks
CREATE TABLE IF NOT EXISTS chunks (
    chunk_hash TEXT PRIMARY KEY,
    size INTEGER NOT NULL
);

-- Blobs table: stores packed, compressed, and encrypted blob information
CREATE TABLE IF NOT EXISTS blobs (
    id TEXT PRIMARY KEY,
    blob_hash TEXT UNIQUE,
    created_ts INTEGER NOT NULL,
    finished_ts INTEGER,
    uncompressed_size INTEGER NOT NULL DEFAULT 0,
    compressed_size INTEGER NOT NULL DEFAULT 0,
    uploaded_ts INTEGER
);

-- Blob chunks table: maps chunks to the blobs that contain them
CREATE TABLE IF NOT EXISTS blob_chunks (
    blob_id TEXT NOT NULL,
    chunk_hash TEXT NOT NULL,
    offset INTEGER NOT NULL,
    length INTEGER NOT NULL,
    PRIMARY KEY (blob_id, chunk_hash),
    FOREIGN KEY (blob_id) REFERENCES blobs(id) ON DELETE CASCADE,
    FOREIGN KEY (chunk_hash) REFERENCES chunks(chunk_hash)
);

-- Index for efficient chunk lookups (used in orphan detection)
CREATE INDEX IF NOT EXISTS idx_blob_chunks_chunk_hash ON blob_chunks(chunk_hash);

-- Chunk files table: reverse mapping of chunks to files
CREATE TABLE IF NOT EXISTS chunk_files (
    chunk_hash TEXT NOT NULL,
    file_id TEXT NOT NULL,
    file_offset INTEGER NOT NULL,
    length INTEGER NOT NULL,
    PRIMARY KEY (chunk_hash, file_id),
    FOREIGN KEY (chunk_hash) REFERENCES chunks(chunk_hash),
    FOREIGN KEY (file_id) REFERENCES files(id) ON DELETE CASCADE
);

-- Index for efficient file lookups (used in orphan detection)
CREATE INDEX IF NOT EXISTS idx_chunk_files_file_id ON chunk_files(file_id);

-- Snapshots table: tracks backup snapshots
CREATE TABLE IF NOT EXISTS snapshots (
    id TEXT PRIMARY KEY,
    hostname TEXT NOT NULL,
    vaultik_version TEXT NOT NULL,
    vaultik_git_revision TEXT NOT NULL,
    started_at INTEGER NOT NULL,
    completed_at INTEGER,
    file_count INTEGER NOT NULL DEFAULT 0,
    chunk_count INTEGER NOT NULL DEFAULT 0,
    blob_count INTEGER NOT NULL DEFAULT 0,
    total_size INTEGER NOT NULL DEFAULT 0,
    blob_size INTEGER NOT NULL DEFAULT 0,
    blob_uncompressed_size INTEGER NOT NULL DEFAULT 0,
    compression_ratio REAL NOT NULL DEFAULT 1.0,
    compression_level INTEGER NOT NULL DEFAULT 3,
    upload_bytes INTEGER NOT NULL DEFAULT 0,
    upload_duration_ms INTEGER NOT NULL DEFAULT 0
);

-- Snapshot files table: maps snapshots to files
CREATE TABLE IF NOT EXISTS snapshot_files (
    snapshot_id TEXT NOT NULL,
    file_id TEXT NOT NULL,
    PRIMARY KEY (snapshot_id, file_id),
    FOREIGN KEY (snapshot_id) REFERENCES snapshots(id) ON DELETE CASCADE,
    FOREIGN KEY (file_id) REFERENCES files(id) ON DELETE CASCADE
);

-- Index for efficient file lookups (used in orphan detection)
CREATE INDEX IF NOT EXISTS idx_snapshot_files_file_id ON snapshot_files(file_id);

-- Snapshot blobs table: maps snapshots to blobs
CREATE TABLE IF NOT EXISTS snapshot_blobs (
    snapshot_id TEXT NOT NULL,
    blob_id TEXT NOT NULL,
    blob_hash TEXT NOT NULL,
    PRIMARY KEY (snapshot_id, blob_id),
    FOREIGN KEY (snapshot_id) REFERENCES snapshots(id) ON DELETE CASCADE,
    FOREIGN KEY (blob_id) REFERENCES blobs(id) ON DELETE CASCADE
);

-- Index for efficient blob lookups (used in orphan detection)
CREATE INDEX IF NOT EXISTS idx_snapshot_blobs_blob_id ON snapshot_blobs(blob_id);

-- Uploads table: tracks blob upload metrics
CREATE TABLE IF NOT EXISTS uploads (
    blob_hash TEXT PRIMARY KEY,
    snapshot_id TEXT NOT NULL,
    uploaded_at INTEGER NOT NULL,
    size INTEGER NOT NULL,
    duration_ms INTEGER NOT NULL,
    FOREIGN KEY (blob_hash) REFERENCES blobs(blob_hash),
    FOREIGN KEY (snapshot_id) REFERENCES snapshots(id) ON DELETE CASCADE
);

-- Index for efficient snapshot lookups
CREATE INDEX IF NOT EXISTS idx_uploads_snapshot_id ON uploads(snapshot_id);

-- Local metadata: keyed, host-local settings that bind the state of the
-- local index database to external context. The primary use is
-- storage_url: once a backup writes blobs to a destination, the local
-- index is only valid against that destination — if the configured
-- storage_url later changes, the scanner would silently think already-
-- known chunks are still on the new (empty) destination and skip
-- uploading them, corrupting future snapshots. On every mutating
-- command startup, we compare the configured storage_url to the stored
-- one and refuse to proceed on mismatch.
CREATE TABLE IF NOT EXISTS local_meta (
    key TEXT PRIMARY KEY,
    value TEXT NOT NULL
);