-- v2.4 CRM Enhanced: activities, tags, loyalty

-- Customer activity timeline (notes, calls, visits, emails, whatsapp)
CREATE TABLE IF NOT EXISTS customer_activities (
    id SERIAL PRIMARY KEY,
    customer_id INTEGER NOT NULL REFERENCES customers(id) ON DELETE CASCADE,
    activity_type VARCHAR(50) NOT NULL, -- 'note', 'call', 'visit', 'email', 'whatsapp', 'sale', 'payment', 'claim'
    title VARCHAR(200),
    description TEXT,
    metadata JSONB, -- e.g. {"call_duration": 120, "email_subject": "..."}
    employee_id INTEGER REFERENCES employees(id),
    created_at TIMESTAMPTZ DEFAULT NOW()
);
CREATE INDEX IF NOT EXISTS idx_cust_act_customer ON customer_activities(customer_id, created_at DESC);
CREATE INDEX IF NOT EXISTS idx_cust_act_type ON customer_activities(activity_type);

-- Customer tags for segmentation
CREATE TABLE IF NOT EXISTS customer_tags (
    id SERIAL PRIMARY KEY,
    tenant_id INTEGER NOT NULL,
    name VARCHAR(100) NOT NULL,
    color VARCHAR(7) DEFAULT '#6B7280', -- hex color
    description TEXT,
    created_at TIMESTAMPTZ DEFAULT NOW(),
    UNIQUE(tenant_id, name)
);
CREATE INDEX IF NOT EXISTS idx_cust_tags_tenant ON customer_tags(tenant_id);

-- Many-to-many: customers <-> tags
CREATE TABLE IF NOT EXISTS customer_tag_assignments (
    customer_id INTEGER NOT NULL REFERENCES customers(id) ON DELETE CASCADE,
    tag_id INTEGER NOT NULL REFERENCES customer_tags(id) ON DELETE CASCADE,
    assigned_at TIMESTAMPTZ DEFAULT NOW(),
    assigned_by INTEGER REFERENCES employees(id),
    PRIMARY KEY (customer_id, tag_id)
);

-- Loyalty / rewards program
CREATE TABLE IF NOT EXISTS loyalty_points (
    id SERIAL PRIMARY KEY,
    customer_id INTEGER NOT NULL REFERENCES customers(id) ON DELETE CASCADE,
    points INTEGER NOT NULL DEFAULT 0,
    points_type VARCHAR(20) NOT NULL DEFAULT 'earned', -- 'earned', 'redeemed', 'expired', 'bonus'
    source_type VARCHAR(50), -- 'sale', 'referral', 'promotion', 'manual', 'redemption'
    source_id INTEGER, -- sale_id or other reference
    description TEXT,
    expires_at TIMESTAMPTZ,
    created_at TIMESTAMPTZ DEFAULT NOW()
);
CREATE INDEX IF NOT EXISTS idx_loyalty_customer ON loyalty_points(customer_id, created_at DESC);
CREATE INDEX IF NOT EXISTS idx_loyalty_expires ON loyalty_points(expires_at) WHERE expires_at IS NOT NULL;

-- Loyalty redemptions (rewards catalog)
CREATE TABLE IF NOT EXISTS loyalty_rewards (
    id SERIAL PRIMARY KEY,
    tenant_id INTEGER NOT NULL,
    name VARCHAR(200) NOT NULL,
    description TEXT,
    points_cost INTEGER NOT NULL,
    reward_type VARCHAR(50) DEFAULT 'discount', -- 'discount', 'free_product', 'service'
    reward_value NUMERIC(12,2), -- discount amount or product ID
    is_active BOOLEAN DEFAULT TRUE,
    created_at TIMESTAMPTZ DEFAULT NOW()
);

-- Loyalty redemption history
CREATE TABLE IF NOT EXISTS loyalty_redemptions (
    id SERIAL PRIMARY KEY,
    customer_id INTEGER NOT NULL REFERENCES customers(id) ON DELETE CASCADE,
    reward_id INTEGER REFERENCES loyalty_rewards(id),
    points_used INTEGER NOT NULL,
    reward_value NUMERIC(12,2),
    description TEXT,
    employee_id INTEGER REFERENCES employees(id),
    created_at TIMESTAMPTZ DEFAULT NOW()
);
CREATE INDEX IF NOT EXISTS idx_loyalty_redem_customer ON loyalty_redemptions(customer_id);

-- Add loyalty balance to customers (denormalized for quick lookup)
ALTER TABLE customers ADD COLUMN IF NOT EXISTS loyalty_points_balance INTEGER DEFAULT 0;
ALTER TABLE customers ADD COLUMN IF NOT EXISTS loyalty_tier VARCHAR(50) DEFAULT 'bronze';