-- Initial schema for K-Notes
-- SQLite with FTS5 for full-text search

-- Users table (OIDC-ready)
CREATE TABLE IF NOT EXISTS users (
    id TEXT PRIMARY KEY NOT NULL,
    subject TEXT UNIQUE NOT NULL,  -- OIDC subject identifier
    email TEXT NOT NULL,
    created_at TEXT NOT NULL DEFAULT (datetime('now'))
);

CREATE INDEX idx_users_subject ON users(subject);
CREATE INDEX idx_users_email ON users(email);

-- Notes table
CREATE TABLE IF NOT EXISTS notes (
    id TEXT PRIMARY KEY NOT NULL,
    user_id TEXT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    title TEXT NOT NULL,
    content TEXT NOT NULL DEFAULT '',
    is_pinned INTEGER NOT NULL DEFAULT 0,
    is_archived INTEGER NOT NULL DEFAULT 0,
    created_at TEXT NOT NULL DEFAULT (datetime('now')),
    updated_at TEXT NOT NULL DEFAULT (datetime('now'))
);

CREATE INDEX idx_notes_user_id ON notes(user_id);
CREATE INDEX idx_notes_is_pinned ON notes(is_pinned);
CREATE INDEX idx_notes_is_archived ON notes(is_archived);
CREATE INDEX idx_notes_updated_at ON notes(updated_at);

-- Tags table (user-scoped)
CREATE TABLE IF NOT EXISTS tags (
    id TEXT PRIMARY KEY NOT NULL,
    name TEXT NOT NULL,
    user_id TEXT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    UNIQUE(name, user_id)
);

CREATE INDEX idx_tags_user_id ON tags(user_id);

-- Junction table for note-tag relationship
CREATE TABLE IF NOT EXISTS note_tags (
    note_id TEXT NOT NULL REFERENCES notes(id) ON DELETE CASCADE,
    tag_id TEXT NOT NULL REFERENCES tags(id) ON DELETE CASCADE,
    PRIMARY KEY (note_id, tag_id)
);

CREATE INDEX idx_note_tags_tag_id ON note_tags(tag_id);

-- Full-text search virtual table
CREATE VIRTUAL TABLE IF NOT EXISTS notes_fts USING fts5(
    title,
    content,
    content='notes',
    content_rowid='rowid'
);

-- Triggers to keep FTS index in sync
CREATE TRIGGER notes_ai AFTER INSERT ON notes BEGIN
    INSERT INTO notes_fts(rowid, title, content) VALUES (NEW.rowid, NEW.title, NEW.content);
END;

CREATE TRIGGER notes_ad AFTER DELETE ON notes BEGIN
    INSERT INTO notes_fts(notes_fts, rowid, title, content) VALUES('delete', OLD.rowid, OLD.title, OLD.content);
END;

CREATE TRIGGER notes_au AFTER UPDATE ON notes BEGIN
    INSERT INTO notes_fts(notes_fts, rowid, title, content) VALUES('delete', OLD.rowid, OLD.title, OLD.content);
    INSERT INTO notes_fts(rowid, title, content) VALUES (NEW.rowid, NEW.title, NEW.content);
END;