-- ============================================================
-- Migration 005: New Access Model
-- Description: Create users table, user_access table, invitations
--              and add owner_user_id to deployments
-- Date: 2025-12-19
-- ============================================================

-- ============================================================
-- 1. CREATE users TABLE (replaces person_details for auth)
-- ============================================================
CREATE TABLE IF NOT EXISTS users (
    id SERIAL PRIMARY KEY,
    email VARCHAR(255) UNIQUE NOT NULL,
    phone VARCHAR(50),
    first_name VARCHAR(100),
    last_name VARCHAR(100),
    -- NO password_hash - using OTP via email

    -- Address (for user profile)
    address_street VARCHAR(255),
    address_city VARCHAR(100),
    address_zip VARCHAR(20),
    address_state VARCHAR(100),
    address_country VARCHAR(100),

    -- System fields
    is_active BOOLEAN DEFAULT true,
    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
    updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
    last_login_at TIMESTAMP WITH TIME ZONE,

    -- Legacy reference for migration
    legacy_person_id INTEGER,

    CONSTRAINT email_format CHECK (email ~* '^[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,}$')
);

CREATE INDEX IF NOT EXISTS idx_users_email ON users(email);
CREATE INDEX IF NOT EXISTS idx_users_legacy ON users(legacy_person_id);

-- ============================================================
-- 2. ADD owner_user_id TO deployments
-- ============================================================
ALTER TABLE deployments
ADD COLUMN IF NOT EXISTS owner_user_id INTEGER REFERENCES users(id);

CREATE INDEX IF NOT EXISTS idx_deployments_owner ON deployments(owner_user_id);

-- ============================================================
-- 3. CREATE user_access TABLE (who can access whom)
-- ============================================================
CREATE TABLE IF NOT EXISTS user_access (
    id SERIAL PRIMARY KEY,

    -- Who is being accessed (beneficiary - the elderly person)
    beneficiary_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,

    -- Who has access (caretaker, owner, installer)
    accessor_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,

    -- What kind of access
    role VARCHAR(20) NOT NULL CHECK (role IN (
        'caretaker',   -- can view data, receive alerts
        'owner',       -- can pay, invite others, manage subscription
        'installer'    -- can configure devices
    )),

    -- Who granted this access
    granted_by INTEGER REFERENCES users(id),
    granted_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),

    -- One accessor can have multiple roles for same beneficiary
    UNIQUE(beneficiary_id, accessor_id, role)
);

CREATE INDEX IF NOT EXISTS idx_ua_beneficiary ON user_access(beneficiary_id);
CREATE INDEX IF NOT EXISTS idx_ua_accessor ON user_access(accessor_id);
CREATE INDEX IF NOT EXISTS idx_ua_role ON user_access(role);

-- ============================================================
-- 4. CREATE invitations TABLE (for inviting new users)
-- ============================================================
CREATE TABLE IF NOT EXISTS invitations (
    id SERIAL PRIMARY KEY,

    -- Who to give access to (the beneficiary)
    beneficiary_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,

    -- Invited person's email
    email VARCHAR(255) NOT NULL,

    -- What role to grant
    role VARCHAR(20) NOT NULL CHECK (role IN ('caretaker', 'owner', 'installer')),

    -- Security token (64 char hex)
    token VARCHAR(64) UNIQUE NOT NULL,

    -- Who sent the invitation
    invited_by INTEGER NOT NULL REFERENCES users(id),

    -- Expiration
    expires_at TIMESTAMP WITH TIME ZONE NOT NULL,

    -- When accepted
    accepted_at TIMESTAMP WITH TIME ZONE,
    accepted_by INTEGER REFERENCES users(id),

    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW()
);

CREATE INDEX IF NOT EXISTS idx_inv_token ON invitations(token);
CREATE INDEX IF NOT EXISTS idx_inv_email ON invitations(email);
CREATE INDEX IF NOT EXISTS idx_inv_beneficiary ON invitations(beneficiary_id);

-- ============================================================
-- 5. MIGRATE DATA from person_details to users
-- ============================================================
INSERT INTO users (
    email, phone, first_name, last_name,
    address_street, address_city, address_zip, address_state, address_country,
    legacy_person_id, created_at
)
SELECT
    COALESCE(email, user_name || '@legacy.wellnuo.local'),
    phone_number,
    first_name,
    last_name,
    address_street, address_city, address_zip, address_state, address_country,
    user_id,
    COALESCE(to_timestamp(time_edit), NOW())
FROM person_details
WHERE email IS NOT NULL OR user_name IS NOT NULL
ON CONFLICT (email) DO NOTHING;

-- ============================================================
-- 6. SET owner_user_id on deployments from deployment_details
-- ============================================================
UPDATE deployments d
SET owner_user_id = u.id
FROM deployment_details dd
JOIN users u ON u.legacy_person_id = dd.beneficiary_id
WHERE d.deployment_id = dd.deployment_id
  AND d.owner_user_id IS NULL;

-- ============================================================
-- 7. MIGRATE ACCESS RELATIONSHIPS from deployment_details
-- ============================================================

-- Caretakers
INSERT INTO user_access (beneficiary_id, accessor_id, role)
SELECT
    beneficiary_user.id,
    caretaker_user.id,
    'caretaker'
FROM deployment_details dd
JOIN users beneficiary_user ON beneficiary_user.legacy_person_id = dd.beneficiary_id
JOIN users caretaker_user ON caretaker_user.legacy_person_id = dd.caretaker_id
WHERE dd.beneficiary_id IS NOT NULL
  AND dd.caretaker_id IS NOT NULL
  AND dd.beneficiary_id != dd.caretaker_id
ON CONFLICT (beneficiary_id, accessor_id, role) DO NOTHING;

-- Owners
INSERT INTO user_access (beneficiary_id, accessor_id, role)
SELECT
    beneficiary_user.id,
    owner_user.id,
    'owner'
FROM deployment_details dd
JOIN users beneficiary_user ON beneficiary_user.legacy_person_id = dd.beneficiary_id
JOIN users owner_user ON owner_user.legacy_person_id = dd.owner_id
WHERE dd.beneficiary_id IS NOT NULL
  AND dd.owner_id IS NOT NULL
  AND dd.beneficiary_id != dd.owner_id
ON CONFLICT (beneficiary_id, accessor_id, role) DO NOTHING;

-- Installers
INSERT INTO user_access (beneficiary_id, accessor_id, role)
SELECT
    beneficiary_user.id,
    installer_user.id,
    'installer'
FROM deployment_details dd
JOIN users beneficiary_user ON beneficiary_user.legacy_person_id = dd.beneficiary_id
JOIN users installer_user ON installer_user.legacy_person_id = dd.installer_id
WHERE dd.beneficiary_id IS NOT NULL
  AND dd.installer_id IS NOT NULL
  AND dd.beneficiary_id != dd.installer_id
ON CONFLICT (beneficiary_id, accessor_id, role) DO NOTHING;

-- ============================================================
-- 8. MIGRATE access_to_deployments (legacy caretaker access)
-- ============================================================
-- This converts "21,38,29" style access to proper relationships
INSERT INTO user_access (beneficiary_id, accessor_id, role)
SELECT DISTINCT
    deployment_owner.id,
    accessor.id,
    'caretaker'
FROM person_details pd
CROSS JOIN LATERAL unnest(string_to_array(pd.access_to_deployments, ',')) AS deployment_id_str
JOIN deployment_details dd ON dd.deployment_id = deployment_id_str::int
JOIN users deployment_owner ON deployment_owner.legacy_person_id = dd.beneficiary_id
JOIN users accessor ON accessor.legacy_person_id = pd.user_id
WHERE pd.access_to_deployments IS NOT NULL
  AND pd.access_to_deployments != ''
  AND deployment_owner.id != accessor.id
ON CONFLICT (beneficiary_id, accessor_id, role) DO NOTHING;

-- ============================================================
-- DONE
-- ============================================================