PRAGMA journal_mode = WAL;
PRAGMA foreign_keys = ON;

-- ----------------------------------------------------------------
-- commodities: one row per unique market (stable reference table)
-- ----------------------------------------------------------------
CREATE TABLE IF NOT EXISTS commodities (
    id              INTEGER PRIMARY KEY,
    cftc_code       TEXT NOT NULL UNIQUE,
    name            TEXT NOT NULL,
    exchange        TEXT NOT NULL,
    exchange_abbr   TEXT NOT NULL,
    contract_unit   TEXT,
    created_at      TEXT DEFAULT (datetime('now'))
);

CREATE INDEX IF NOT EXISTS idx_commodities_name     ON commodities(name);
CREATE INDEX IF NOT EXISTS idx_commodities_exchange ON commodities(exchange_abbr);

-- ----------------------------------------------------------------
-- reports: one row per (commodity x report_date)
-- ----------------------------------------------------------------
CREATE TABLE IF NOT EXISTS reports (
    id               INTEGER PRIMARY KEY,
    commodity_id     INTEGER NOT NULL REFERENCES commodities(id),
    report_date      TEXT NOT NULL,
    prev_report_date TEXT,
    source_file      TEXT,
    imported_at      TEXT DEFAULT (datetime('now')),
    UNIQUE (commodity_id, report_date)
);

CREATE INDEX IF NOT EXISTS idx_reports_date      ON reports(report_date);
CREATE INDEX IF NOT EXISTS idx_reports_commodity ON reports(commodity_id);

-- ----------------------------------------------------------------
-- positions: core position data, one row per (report x row_type)
-- row_type: 'All', 'Old', 'Other'
-- ----------------------------------------------------------------
CREATE TABLE IF NOT EXISTS positions (
    id                      INTEGER PRIMARY KEY,
    report_id               INTEGER NOT NULL REFERENCES reports(id),
    row_type                TEXT NOT NULL CHECK (row_type IN ('All', 'Old', 'Other')),

    -- Open interest
    open_interest           INTEGER,

    -- Non-commercial
    noncomm_long            INTEGER,
    noncomm_short           INTEGER,
    noncomm_spreading       INTEGER,

    -- Commercial
    comm_long               INTEGER,
    comm_short              INTEGER,

    -- Total reportable
    total_long              INTEGER,
    total_short             INTEGER,

    -- Nonreportable (small traders)
    nonrept_long            INTEGER,
    nonrept_short           INTEGER,

    -- Week-over-week changes (stored on All rows only)
    chg_open_interest       INTEGER,
    chg_noncomm_long        INTEGER,
    chg_noncomm_short       INTEGER,
    chg_noncomm_spreading   INTEGER,
    chg_comm_long           INTEGER,
    chg_comm_short          INTEGER,
    chg_total_long          INTEGER,
    chg_total_short         INTEGER,
    chg_nonrept_long        INTEGER,
    chg_nonrept_short       INTEGER,

    -- Percent of open interest
    pct_open_interest       REAL,
    pct_noncomm_long        REAL,
    pct_noncomm_short       REAL,
    pct_noncomm_spreading   REAL,
    pct_comm_long           REAL,
    pct_comm_short          REAL,
    pct_total_long          REAL,
    pct_total_short         REAL,
    pct_nonrept_long        REAL,
    pct_nonrept_short       REAL,

    -- Number of traders
    traders_total           INTEGER,
    traders_noncomm_long    INTEGER,
    traders_noncomm_short   INTEGER,
    traders_noncomm_spread  INTEGER,
    traders_comm_long       INTEGER,
    traders_comm_short      INTEGER,
    traders_total_long      INTEGER,
    traders_total_short     INTEGER,

    UNIQUE (report_id, row_type)
);

CREATE INDEX IF NOT EXISTS idx_positions_report ON positions(report_id);

-- ----------------------------------------------------------------
-- concentration: largest-trader data (separate -- less-queried)
-- row_type: 'All', 'Old', 'Other'
-- ----------------------------------------------------------------
CREATE TABLE IF NOT EXISTS concentration (
    id                  INTEGER PRIMARY KEY,
    report_id           INTEGER NOT NULL REFERENCES reports(id),
    row_type            TEXT NOT NULL CHECK (row_type IN ('All', 'Old', 'Other')),

    -- By Gross Position
    conc_gross_long_4   REAL,
    conc_gross_short_4  REAL,
    conc_gross_long_8   REAL,
    conc_gross_short_8  REAL,

    -- By Net Position
    conc_net_long_4     REAL,
    conc_net_short_4    REAL,
    conc_net_long_8     REAL,
    conc_net_short_8    REAL,

    UNIQUE (report_id, row_type)
);

CREATE INDEX IF NOT EXISTS idx_concentration_report ON concentration(report_id);

-- ----------------------------------------------------------------
-- import_log: tracks which source files have been processed
-- ----------------------------------------------------------------
CREATE TABLE IF NOT EXISTS import_log (
    id            INTEGER PRIMARY KEY,
    source        TEXT NOT NULL UNIQUE,
    source_type   TEXT NOT NULL,
    rows_inserted INTEGER DEFAULT 0,
    rows_skipped  INTEGER DEFAULT 0,
    started_at    TEXT,
    completed_at  TEXT,
    status        TEXT DEFAULT 'pending',
    error_message TEXT
);

-- ----------------------------------------------------------------
-- v_net_positions: convenience view for common analytical queries
-- ----------------------------------------------------------------
CREATE VIEW IF NOT EXISTS v_net_positions AS
SELECT
    c.cftc_code,
    c.name              AS commodity,
    c.exchange_abbr     AS exchange,
    r.report_date,
    r.prev_report_date,
    p.row_type,
    p.open_interest,
    p.noncomm_long,
    p.noncomm_short,
    p.noncomm_spreading,
    (p.noncomm_long - p.noncomm_short)  AS noncomm_net,
    p.comm_long,
    p.comm_short,
    (p.comm_long - p.comm_short)        AS comm_net,
    p.nonrept_long,
    p.nonrept_short,
    (p.nonrept_long - p.nonrept_short)  AS nonrept_net,
    p.chg_open_interest,
    p.chg_noncomm_long,
    p.chg_noncomm_short,
    p.chg_comm_long,
    p.chg_comm_short,
    p.pct_noncomm_long,
    p.pct_noncomm_short,
    p.pct_comm_long,
    p.pct_comm_short,
    p.traders_total,
    p.traders_noncomm_long,
    p.traders_noncomm_short,
    p.traders_comm_long,
    p.traders_comm_short
FROM positions p
JOIN reports r    ON r.id = p.report_id
JOIN commodities c ON c.id = r.commodity_id;