-- Phase 2.8: Authentication and Multi-Tenant Schema
--
-- Adds:
-- 1. memory_projects table (source of truth for project ownership)
-- 2. contributed_by columns (attribution tracking)
-- 3. Indexes for fast lookups
--
-- Note: RBAC itself lives in auth provider (Authentik, custom service, etc).
-- This schema only tracks project ownership and user attribution.

-- ─────────────────────────────────────────────────────────────────────────────
-- 1. Projects table (source of truth for ownership)
-- ─────────────────────────────────────────────────────────────────────────────

CREATE TABLE IF NOT EXISTS memory_projects (
    id VARCHAR(255) PRIMARY KEY,
    
    -- Ownership
    owner_id VARCHAR(255) NOT NULL,        -- JWT "sub" of creator
    visibility VARCHAR(20) NOT NULL,       -- "private" | "team" | "public"
    
    -- Metadata
    name VARCHAR(255),                     -- Display name
    description TEXT,
    created_at TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP,
    
    -- Soft delete
    deleted_at TIMESTAMPTZ
);

CREATE INDEX IF NOT EXISTS idx_memory_projects_owner_id 
    ON memory_projects(owner_id) 
    WHERE deleted_at IS NULL;

CREATE INDEX IF NOT EXISTS idx_memory_projects_visibility 
    ON memory_projects(visibility) 
    WHERE deleted_at IS NULL;

-- ─────────────────────────────────────────────────────────────────────────────
-- 2. Add attribution columns to entities
-- ─────────────────────────────────────────────────────────────────────────────

ALTER TABLE memory_entity ADD COLUMN IF NOT EXISTS (
    contributed_by VARCHAR(255),           -- JWT "sub" who added this
    contribution_type VARCHAR(50),         -- "extracted" | "manual" | "inferred"
    contribution_date TIMESTAMPTZ
);

-- Populate contributed_by with defaults (assume "system" if not present)
UPDATE memory_entity 
SET contributed_by = 'system' 
WHERE contributed_by IS NULL;

ALTER TABLE memory_entity 
ALTER COLUMN contributed_by SET NOT NULL;

CREATE INDEX IF NOT EXISTS idx_memory_entity_contributed_by 
    ON memory_entity(contributed_by);

CREATE INDEX IF NOT EXISTS idx_memory_entity_contribution_date 
    ON memory_entity(contribution_date) 
    WHERE contribution_date IS NOT NULL;

-- ─────────────────────────────────────────────────────────────────────────────
-- 3. Add attribution columns to edges
-- ─────────────────────────────────────────────────────────────────────────────

ALTER TABLE memory_edge ADD COLUMN IF NOT EXISTS (
    contributed_by VARCHAR(255),           -- JWT "sub" who added this
    contribution_type VARCHAR(50)          -- "extracted" | "inferred"
);

-- Populate contributed_by with defaults
UPDATE memory_edge 
SET contributed_by = 'system' 
WHERE contributed_by IS NULL;

ALTER TABLE memory_edge 
ALTER COLUMN contributed_by SET NOT NULL;

CREATE INDEX IF NOT EXISTS idx_memory_edge_contributed_by 
    ON memory_edge(contributed_by);

-- ─────────────────────────────────────────────────────────────────────────────
-- 4. Add project_id to entities and edges (optional, for faster filtering)
-- ─────────────────────────────────────────────────────────────────────────────

-- ALTER TABLE memory_entity ADD COLUMN IF NOT EXISTS project_id VARCHAR(255);
-- ALTER TABLE memory_edge ADD COLUMN IF NOT EXISTS project_id VARCHAR(255);
-- 
-- Note: Deferred. Can use project info from path/source instead.

-- ─────────────────────────────────────────────────────────────────────────────
-- 5. Views for common queries
-- ─────────────────────────────────────────────────────────────────────────────

-- Entities contributed by a user in a time range
CREATE OR REPLACE VIEW v_user_contributions AS
SELECT 
    contributed_by,
    COUNT(*) as entity_count,
    MAX(contribution_date) as last_contribution,
    ARRAY_AGG(DISTINCT contribution_type) as contribution_types
FROM memory_entity
WHERE contribution_date IS NOT NULL
GROUP BY contributed_by;

-- Recent contributions (last 7 days)
CREATE OR REPLACE VIEW v_recent_contributions AS
SELECT 
    contributed_by,
    COUNT(*) as count,
    MAX(contribution_date) as latest
FROM memory_entity
WHERE contribution_date > CURRENT_TIMESTAMP - INTERVAL '7 days'
GROUP BY contributed_by;

-- ─────────────────────────────────────────────────────────────────────────────
-- 6. Rollback support
-- ─────────────────────────────────────────────────────────────────────────────

-- To rollback this migration:
-- 
-- DROP VIEW IF EXISTS v_recent_contributions;
-- DROP VIEW IF EXISTS v_user_contributions;
-- 
-- DROP INDEX IF EXISTS idx_memory_projects_owner_id;
-- DROP INDEX IF EXISTS idx_memory_projects_visibility;
-- DROP TABLE IF EXISTS memory_projects;
-- 
-- DROP INDEX IF EXISTS idx_memory_entity_contributed_by;
-- DROP INDEX IF EXISTS idx_memory_entity_contribution_date;
-- ALTER TABLE memory_entity DROP COLUMN IF EXISTS contributed_by;
-- ALTER TABLE memory_entity DROP COLUMN IF EXISTS contribution_type;
-- ALTER TABLE memory_entity DROP COLUMN IF EXISTS contribution_date;
-- 
-- DROP INDEX IF EXISTS idx_memory_edge_contributed_by;
-- ALTER TABLE memory_edge DROP COLUMN IF EXISTS contributed_by;
-- ALTER TABLE memory_edge DROP COLUMN IF EXISTS contribution_type;