-- =============================================
-- Tables: mlm
-- Module: SAAS-021 MLM (Multi-Level Marketing)
-- =============================================

-- ─────────────────────────────────────────────
-- structures - MLM network structure configuration
-- ─────────────────────────────────────────────
CREATE TABLE mlm.structures (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    tenant_id UUID NOT NULL REFERENCES tenants.tenants(id) ON DELETE CASCADE,

    name VARCHAR(100) NOT NULL,
    description TEXT,
    type mlm.structure_type NOT NULL,

    -- Configuration per type (JSONB)
    -- Unilevel: { max_width: null, max_depth: 10 }
    -- Binary: { spillover: 'left_first' | 'weak_leg' | 'balanced' }
    -- Matrix: { width: 3, depth: 7 }
    config JSONB NOT NULL DEFAULT '{}',

    -- Commission rates by level (JSONB array)
    -- [{ level: 1, rate: 0.10 }, { level: 2, rate: 0.05 }, ...]
    level_rates JSONB NOT NULL DEFAULT '[]',

    -- Matching bonus rates (for matching commissions)
    matching_rates JSONB DEFAULT '[]',

    is_active BOOLEAN DEFAULT true,

    created_at TIMESTAMPTZ DEFAULT NOW(),
    updated_at TIMESTAMPTZ DEFAULT NOW(),
    created_by UUID REFERENCES users.users(id) ON DELETE SET NULL,

    CONSTRAINT unique_structure_name_per_tenant UNIQUE (tenant_id, name)
);

COMMENT ON TABLE mlm.structures IS 'MLM network structure configurations';
COMMENT ON COLUMN mlm.structures.config IS 'Structure-specific configuration (max_depth, spillover, etc.)';
COMMENT ON COLUMN mlm.structures.level_rates IS 'Commission percentages by level depth';

-- Trigger for updated_at
CREATE TRIGGER set_structures_updated_at
    BEFORE UPDATE ON mlm.structures
    FOR EACH ROW
    EXECUTE FUNCTION public.set_updated_at();

-- ─────────────────────────────────────────────
-- ranks - MLM qualification ranks
-- ─────────────────────────────────────────────
CREATE TABLE mlm.ranks (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    tenant_id UUID NOT NULL REFERENCES tenants.tenants(id) ON DELETE CASCADE,
    structure_id UUID NOT NULL REFERENCES mlm.structures(id) ON DELETE CASCADE,

    name VARCHAR(100) NOT NULL,
    level INTEGER NOT NULL, -- 1=Entry, 2=Bronze, 3=Silver, etc.
    badge_url VARCHAR(500),
    color VARCHAR(7), -- Hex color for UI

    -- Requirements to achieve rank (JSONB)
    -- {
    --   personal_volume: 1000,
    --   group_volume: 10000,
    --   direct_referrals: 3,
    --   active_legs: 2,
    --   rank_in_legs: { rank_level: 2, count: 1 }
    -- }
    requirements JSONB NOT NULL DEFAULT '{}',

    -- Benefits for this rank
    bonus_rate DECIMAL(10,4), -- Additional bonus percentage
    benefits JSONB DEFAULT '{}', -- Other benefits (discounts, access, etc.)

    is_active BOOLEAN DEFAULT true,

    created_at TIMESTAMPTZ DEFAULT NOW(),
    updated_at TIMESTAMPTZ DEFAULT NOW(),

    CONSTRAINT unique_rank_level_per_structure UNIQUE (structure_id, level)
);

COMMENT ON TABLE mlm.ranks IS 'MLM qualification ranks with requirements and benefits';
COMMENT ON COLUMN mlm.ranks.requirements IS 'Conditions to achieve this rank';

-- Trigger for updated_at
CREATE TRIGGER set_ranks_updated_at
    BEFORE UPDATE ON mlm.ranks
    FOR EACH ROW
    EXECUTE FUNCTION public.set_updated_at();

-- ─────────────────────────────────────────────
-- nodes - MLM network nodes (distributors)
-- ─────────────────────────────────────────────
CREATE TABLE mlm.nodes (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    tenant_id UUID NOT NULL REFERENCES tenants.tenants(id) ON DELETE CASCADE,
    structure_id UUID NOT NULL REFERENCES mlm.structures(id) ON DELETE CASCADE,

    user_id UUID NOT NULL REFERENCES users.users(id) ON DELETE CASCADE,

    -- Hierarchy
    parent_id UUID REFERENCES mlm.nodes(id) ON DELETE SET NULL,
    sponsor_id UUID REFERENCES mlm.nodes(id) ON DELETE SET NULL, -- Who referred them
    position INTEGER, -- For binary: 1=left, 2=right. For matrix: 1,2,3...width

    -- Materialized path for efficient queries (LTREE)
    path LTREE,
    depth INTEGER DEFAULT 0,

    -- Current and highest rank
    rank_id UUID REFERENCES mlm.ranks(id) ON DELETE SET NULL,
    highest_rank_id UUID REFERENCES mlm.ranks(id) ON DELETE SET NULL,

    -- Performance metrics
    personal_volume DECIMAL(15,2) DEFAULT 0,
    group_volume DECIMAL(15,2) DEFAULT 0,
    direct_referrals INTEGER DEFAULT 0,
    total_downline INTEGER DEFAULT 0,

    -- Lifetime earnings
    total_earnings DECIMAL(15,2) DEFAULT 0,

    -- Status
    status mlm.node_status NOT NULL DEFAULT 'active',
    joined_at TIMESTAMPTZ DEFAULT NOW(),

    -- Invitation
    invite_code VARCHAR(20) UNIQUE,

    created_at TIMESTAMPTZ DEFAULT NOW(),
    updated_at TIMESTAMPTZ DEFAULT NOW(),

    CONSTRAINT unique_user_per_structure UNIQUE (structure_id, user_id)
);

COMMENT ON TABLE mlm.nodes IS 'MLM network nodes representing distributors in the hierarchy';
COMMENT ON COLUMN mlm.nodes.path IS 'LTREE path for efficient ancestor/descendant queries';
COMMENT ON COLUMN mlm.nodes.position IS 'Position under parent (left/right for binary, slot for matrix)';

-- Trigger for updated_at
CREATE TRIGGER set_nodes_updated_at
    BEFORE UPDATE ON mlm.nodes
    FOR EACH ROW
    EXECUTE FUNCTION public.set_updated_at();

-- ─────────────────────────────────────────────
-- commissions - MLM commission entries
-- ─────────────────────────────────────────────
CREATE TABLE mlm.commissions (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    tenant_id UUID NOT NULL REFERENCES tenants.tenants(id) ON DELETE CASCADE,

    node_id UUID NOT NULL REFERENCES mlm.nodes(id) ON DELETE CASCADE, -- Who receives
    source_node_id UUID NOT NULL REFERENCES mlm.nodes(id) ON DELETE CASCADE, -- Who generated

    -- Commission type
    type mlm.commission_type NOT NULL,

    -- Level difference (1 = direct, 2 = second level, etc.)
    level INTEGER NOT NULL,

    -- Amounts
    source_amount DECIMAL(15,2) NOT NULL, -- Original sale/volume amount
    rate_applied DECIMAL(10,4) NOT NULL, -- Rate used for calculation
    commission_amount DECIMAL(15,2) NOT NULL, -- Final commission
    currency VARCHAR(3) DEFAULT 'USD',

    -- Reference to period and source
    period_id UUID REFERENCES commissions.periods(id) ON DELETE SET NULL,
    source_reference VARCHAR(200), -- Reference to sale/transaction

    -- Status
    status mlm.commission_status NOT NULL DEFAULT 'pending',
    paid_at TIMESTAMPTZ,

    notes TEXT,

    created_at TIMESTAMPTZ DEFAULT NOW()
);

COMMENT ON TABLE mlm.commissions IS 'MLM commission entries from downline activity';
COMMENT ON COLUMN mlm.commissions.level IS 'Level depth from source to beneficiary';

-- ─────────────────────────────────────────────
-- bonuses - MLM bonus entries
-- ─────────────────────────────────────────────
CREATE TABLE mlm.bonuses (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    tenant_id UUID NOT NULL REFERENCES tenants.tenants(id) ON DELETE CASCADE,

    node_id UUID NOT NULL REFERENCES mlm.nodes(id) ON DELETE CASCADE,
    rank_id UUID REFERENCES mlm.ranks(id) ON DELETE SET NULL,

    type mlm.bonus_type NOT NULL,
    amount DECIMAL(15,2) NOT NULL,
    currency VARCHAR(3) DEFAULT 'USD',

    -- Reference to period
    period_id UUID REFERENCES commissions.periods(id) ON DELETE SET NULL,

    -- Status
    status mlm.commission_status NOT NULL DEFAULT 'pending',
    paid_at TIMESTAMPTZ,

    achieved_at TIMESTAMPTZ DEFAULT NOW(),
    notes TEXT,

    created_at TIMESTAMPTZ DEFAULT NOW()
);

COMMENT ON TABLE mlm.bonuses IS 'MLM bonus entries for rank achievements and other bonuses';

-- ─────────────────────────────────────────────
-- rank_history - Historical rank achievements
-- ─────────────────────────────────────────────
CREATE TABLE mlm.rank_history (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    tenant_id UUID NOT NULL REFERENCES tenants.tenants(id) ON DELETE CASCADE,

    node_id UUID NOT NULL REFERENCES mlm.nodes(id) ON DELETE CASCADE,
    rank_id UUID NOT NULL REFERENCES mlm.ranks(id) ON DELETE CASCADE,

    previous_rank_id UUID REFERENCES mlm.ranks(id) ON DELETE SET NULL,

    -- Snapshot of metrics at achievement
    personal_volume_at DECIMAL(15,2),
    group_volume_at DECIMAL(15,2),
    direct_referrals_at INTEGER,

    achieved_at TIMESTAMPTZ DEFAULT NOW()
);

COMMENT ON TABLE mlm.rank_history IS 'Historical record of rank achievements';