-- Likwid Initial Schema
-- Modular Governance Platform

-- Enable UUID extension
CREATE EXTENSION IF NOT EXISTS "uuid-ossp";

-- Users table (civic identity)
CREATE TABLE users (
    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    username VARCHAR(50) UNIQUE NOT NULL,
    email VARCHAR(255) UNIQUE NOT NULL,
    password_hash VARCHAR(255) NOT NULL,
    display_name VARCHAR(100),
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    is_active BOOLEAN NOT NULL DEFAULT TRUE
);

-- Communities (supports multi-community mode)
CREATE TABLE communities (
    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    name VARCHAR(100) UNIQUE NOT NULL,
    slug VARCHAR(100) UNIQUE NOT NULL,
    description TEXT,
    settings JSONB NOT NULL DEFAULT '{}',
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    is_active BOOLEAN NOT NULL DEFAULT TRUE
);

-- Community membership
CREATE TABLE community_members (
    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    community_id UUID NOT NULL REFERENCES communities(id) ON DELETE CASCADE,
    role VARCHAR(50) NOT NULL DEFAULT 'member',
    joined_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    UNIQUE(user_id, community_id)
);

-- Voting identities (separate from civic identity for anonymity)
CREATE TABLE voting_identities (
    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    community_id UUID NOT NULL REFERENCES communities(id) ON DELETE CASCADE,
    pseudonym VARCHAR(100) NOT NULL,
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    UNIQUE(user_id, community_id),
    UNIQUE(pseudonym, community_id)
);

-- Plugins registry
CREATE TABLE plugins (
    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    name VARCHAR(100) UNIQUE NOT NULL,
    version VARCHAR(20) NOT NULL,
    description TEXT,
    is_core BOOLEAN NOT NULL DEFAULT FALSE,
    is_active BOOLEAN NOT NULL DEFAULT TRUE,
    settings_schema JSONB,
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

-- Plugin activation per community
CREATE TABLE community_plugins (
    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    community_id UUID NOT NULL REFERENCES communities(id) ON DELETE CASCADE,
    plugin_id UUID NOT NULL REFERENCES plugins(id) ON DELETE CASCADE,
    settings JSONB NOT NULL DEFAULT '{}',
    is_active BOOLEAN NOT NULL DEFAULT TRUE,
    activated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    UNIQUE(community_id, plugin_id)
);

-- Moderation log (immutable, non-deactivatable per spec)
CREATE TABLE moderation_log (
    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    community_id UUID NOT NULL REFERENCES communities(id) ON DELETE CASCADE,
    moderator_id UUID REFERENCES users(id),
    target_user_id UUID REFERENCES users(id),
    action_type VARCHAR(50) NOT NULL,
    reason TEXT NOT NULL,
    details JSONB,
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

-- Create indexes
CREATE INDEX idx_community_members_user ON community_members(user_id);
CREATE INDEX idx_community_members_community ON community_members(community_id);
CREATE INDEX idx_voting_identities_user ON voting_identities(user_id);
CREATE INDEX idx_moderation_log_community ON moderation_log(community_id);
CREATE INDEX idx_moderation_log_created ON moderation_log(created_at);

-- Updated_at trigger function
CREATE OR REPLACE FUNCTION update_updated_at()
RETURNS TRIGGER AS $$
BEGIN
    NEW.updated_at = NOW();
    RETURN NEW;
END;
$$ LANGUAGE plpgsql;

-- Apply trigger to tables with updated_at
CREATE TRIGGER users_updated_at BEFORE UPDATE ON users
    FOR EACH ROW EXECUTE FUNCTION update_updated_at();

CREATE TRIGGER communities_updated_at BEFORE UPDATE ON communities
    FOR EACH ROW EXECUTE FUNCTION update_updated_at();