PRAGMA foreign_keys = ON;

CREATE TABLE IF NOT EXISTS workspaces (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    slug TEXT NOT NULL UNIQUE,
    title TEXT NOT NULL,
    password_hash TEXT,
    created_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP,
    updated_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP
);

CREATE TABLE IF NOT EXISTS notes (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    workspace_id INTEGER NOT NULL,
    slug TEXT NOT NULL,
    title TEXT NOT NULL,
    content TEXT NOT NULL DEFAULT '',
    created_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP,
    updated_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (workspace_id) REFERENCES workspaces(id) ON DELETE CASCADE,
    UNIQUE(workspace_id, slug)
);

CREATE TABLE IF NOT EXISTS note_revisions (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    note_id INTEGER NOT NULL,
    content TEXT NOT NULL,
    created_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (note_id) REFERENCES notes(id) ON DELETE CASCADE
);

CREATE INDEX IF NOT EXISTS idx_notes_workspace ON notes(workspace_id, updated_at DESC);
CREATE INDEX IF NOT EXISTS idx_note_revisions_note ON note_revisions(note_id, id DESC);

-- Preserve data from version 0.4.x: the old note becomes a workspace with one note.
INSERT OR IGNORE INTO workspaces (id, slug, title, password_hash, created_at, updated_at)
SELECT id, slug, title, password_hash, created_at, updated_at FROM pads;

INSERT OR IGNORE INTO notes (id, workspace_id, slug, title, content, created_at, updated_at)
SELECT id, id, 'notatka', title, content, created_at, updated_at FROM pads;

INSERT OR IGNORE INTO note_revisions (id, note_id, content, created_at)
SELECT id, pad_id, content, created_at FROM revisions;