CREATE SCHEMA IF NOT EXISTS raw;
CREATE SCHEMA IF NOT EXISTS bronze;
CREATE SCHEMA IF NOT EXISTS silver;
CREATE SCHEMA IF NOT EXISTS gold;
CREATE SCHEMA IF NOT EXISTS app;
CREATE SCHEMA IF NOT EXISTS audit;

CREATE TABLE IF NOT EXISTS audit.data_sources (
    source_id BIGSERIAL PRIMARY KEY,
    name TEXT NOT NULL UNIQUE,
    source_type TEXT NOT NULL,
    url TEXT,
    cadence TEXT,
    reliability TEXT NOT NULL DEFAULT 'unknown',
    notes TEXT NOT NULL DEFAULT '',
    created_at TIMESTAMPTZ NOT NULL DEFAULT now()
);

CREATE TABLE IF NOT EXISTS audit.ingestion_runs (
    run_id BIGSERIAL PRIMARY KEY,
    source_id BIGINT REFERENCES audit.data_sources(source_id),
    status TEXT NOT NULL,
    started_at TIMESTAMPTZ NOT NULL DEFAULT now(),
    finished_at TIMESTAMPTZ,
    raw_uri TEXT,
    row_count INTEGER,
    error_message TEXT
);

CREATE TABLE IF NOT EXISTS silver.areas (
    area_id TEXT PRIMARY KEY,
    name TEXT NOT NULL,
    district TEXT NOT NULL,
    segment TEXT NOT NULL,
    notes TEXT NOT NULL DEFAULT '',
    created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
    updated_at TIMESTAMPTZ NOT NULL DEFAULT now()
);

CREATE TABLE IF NOT EXISTS silver.area_monthly_metrics (
    area_id TEXT NOT NULL REFERENCES silver.areas(area_id),
    month TEXT NOT NULL CHECK (month ~ '^[0-9]{4}-[0-9]{2}$'),
    transaction_count INTEGER NOT NULL CHECK (transaction_count >= 0),
    transaction_price_psm DOUBLE PRECISION NOT NULL CHECK (transaction_price_psm >= 0),
    listing_count INTEGER NOT NULL CHECK (listing_count >= 0),
    listing_price_psm DOUBLE PRECISION NOT NULL CHECK (listing_price_psm >= 0),
    median_days_on_market DOUBLE PRECISION NOT NULL CHECK (median_days_on_market >= 0),
    rent_price_psm DOUBLE PRECISION NOT NULL CHECK (rent_price_psm >= 0),
    new_supply_units INTEGER NOT NULL CHECK (new_supply_units >= 0),
    land_residential_gfa_sqm DOUBLE PRECISION NOT NULL CHECK (land_residential_gfa_sqm >= 0),
    mortgage_rate_pct DOUBLE PRECISION NOT NULL CHECK (mortgage_rate_pct >= 0),
    policy_signal INTEGER NOT NULL DEFAULT 0 CHECK (policy_signal BETWEEN -2 AND 2),
    source TEXT NOT NULL DEFAULT 'manual',
    created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
    updated_at TIMESTAMPTZ NOT NULL DEFAULT now(),
    PRIMARY KEY (area_id, month)
);

CREATE TABLE IF NOT EXISTS silver.neighborhoods (
    neighborhood_id TEXT PRIMARY KEY,
    area_id TEXT NOT NULL REFERENCES silver.areas(area_id),
    name TEXT NOT NULL,
    built_year INTEGER,
    property_type TEXT NOT NULL,
    metro_distance_m INTEGER,
    school_quality TEXT,
    notes TEXT NOT NULL DEFAULT '',
    created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
    updated_at TIMESTAMPTZ NOT NULL DEFAULT now()
);

CREATE TABLE IF NOT EXISTS silver.neighborhood_monthly_metrics (
    neighborhood_id TEXT NOT NULL REFERENCES silver.neighborhoods(neighborhood_id),
    month TEXT NOT NULL CHECK (month ~ '^[0-9]{4}-[0-9]{2}$'),
    transaction_count INTEGER NOT NULL CHECK (transaction_count >= 0),
    transaction_price_psm DOUBLE PRECISION NOT NULL CHECK (transaction_price_psm >= 0),
    listing_count INTEGER NOT NULL CHECK (listing_count >= 0),
    listing_price_psm DOUBLE PRECISION NOT NULL CHECK (listing_price_psm >= 0),
    rent_price_psm DOUBLE PRECISION NOT NULL CHECK (rent_price_psm >= 0),
    median_days_on_market DOUBLE PRECISION NOT NULL CHECK (median_days_on_market >= 0),
    available_units INTEGER NOT NULL CHECK (available_units >= 0),
    source TEXT NOT NULL DEFAULT 'manual',
    created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
    updated_at TIMESTAMPTZ NOT NULL DEFAULT now(),
    PRIMARY KEY (neighborhood_id, month)
);

CREATE TABLE IF NOT EXISTS gold.area_scores (
    area_id TEXT NOT NULL REFERENCES silver.areas(area_id),
    name TEXT NOT NULL,
    district TEXT NOT NULL,
    segment TEXT NOT NULL,
    month TEXT NOT NULL CHECK (month ~ '^[0-9]{4}-[0-9]{2}$'),
    investment_score DOUBLE PRECISION NOT NULL CHECK (investment_score BETWEEN 0 AND 100),
    recommendation TEXT NOT NULL,
    liquidity_score DOUBLE PRECISION NOT NULL CHECK (liquidity_score BETWEEN 0 AND 100),
    momentum_score DOUBLE PRECISION NOT NULL CHECK (momentum_score BETWEEN 0 AND 100),
    rent_support_score DOUBLE PRECISION NOT NULL CHECK (rent_support_score BETWEEN 0 AND 100),
    safety_margin_score DOUBLE PRECISION NOT NULL CHECK (safety_margin_score BETWEEN 0 AND 100),
    credit_support_score DOUBLE PRECISION NOT NULL CHECK (credit_support_score BETWEEN 0 AND 100),
    supply_risk_score DOUBLE PRECISION NOT NULL CHECK (supply_risk_score BETWEEN 0 AND 100),
    valuation_pressure_score DOUBLE PRECISION NOT NULL CHECK (valuation_pressure_score BETWEEN 0 AND 100),
    transaction_count INTEGER NOT NULL CHECK (transaction_count >= 0),
    transaction_price_psm DOUBLE PRECISION NOT NULL CHECK (transaction_price_psm >= 0),
    listing_count INTEGER NOT NULL CHECK (listing_count >= 0),
    listing_price_psm DOUBLE PRECISION NOT NULL CHECK (listing_price_psm >= 0),
    rent_price_psm DOUBLE PRECISION NOT NULL CHECK (rent_price_psm >= 0),
    median_days_on_market DOUBLE PRECISION NOT NULL CHECK (median_days_on_market >= 0),
    annual_rent_yield_pct DOUBLE PRECISION NOT NULL CHECK (annual_rent_yield_pct >= 0),
    listing_pressure_ratio DOUBLE PRECISION NOT NULL CHECK (listing_pressure_ratio >= 0),
    discount_pct DOUBLE PRECISION NOT NULL,
    price_momentum_pct DOUBLE PRECISION NOT NULL,
    volume_momentum_pct DOUBLE PRECISION NOT NULL,
    model_version TEXT NOT NULL DEFAULT 'sample-v1',
    computed_at TIMESTAMPTZ NOT NULL DEFAULT now(),
    PRIMARY KEY (area_id, month)
);

CREATE TABLE IF NOT EXISTS app.watchlist_items (
    watchlist_item_id BIGSERIAL PRIMARY KEY,
    neighborhood_id TEXT REFERENCES silver.neighborhoods(neighborhood_id),
    area_id TEXT REFERENCES silver.areas(area_id),
    target_price_psm DOUBLE PRECISION CHECK (target_price_psm >= 0),
    status TEXT NOT NULL DEFAULT 'active',
    notes TEXT NOT NULL DEFAULT '',
    created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
    updated_at TIMESTAMPTZ NOT NULL DEFAULT now(),
    CHECK (neighborhood_id IS NOT NULL OR area_id IS NOT NULL)
);

CREATE INDEX IF NOT EXISTS idx_area_monthly_metrics_month ON silver.area_monthly_metrics(month);
CREATE INDEX IF NOT EXISTS idx_neighborhoods_area ON silver.neighborhoods(area_id);
CREATE INDEX IF NOT EXISTS idx_gold_area_scores_month ON gold.area_scores(month, investment_score DESC);
CREATE INDEX IF NOT EXISTS idx_watchlist_status ON app.watchlist_items(status);