-- libreDecision v3 — initial schema. Runtime data: never dropped, never rewritten.
-- Dates are RFC 3339 UTC strings (sortable).

CREATE TABLE identities (
    id            TEXT PRIMARY KEY,          -- idty:<index> | inv:<hex> | dev:<name>
    kind          TEXT NOT NULL,             -- g1 | invite | dev
    display_name  TEXT NOT NULL,
    address       TEXT,                      -- SS58 seen at the last Ğ1 sign-in, display only
    g1_member     INTEGER NOT NULL DEFAULT 0,
    admin         INTEGER NOT NULL DEFAULT 0,
    created_at    TEXT NOT NULL,
    last_seen_at  TEXT
);

CREATE TABLE sessions (
    token_hash   TEXT PRIMARY KEY,
    identity_id  TEXT NOT NULL REFERENCES identities(id),
    created_at   TEXT NOT NULL,
    expires_at   TEXT NOT NULL
);

CREATE TABLE invitations (
    token_hash   TEXT PRIMARY KEY,
    label        TEXT NOT NULL,
    admin        INTEGER NOT NULL DEFAULT 0,
    groups       TEXT NOT NULL DEFAULT '[]', -- JSON array of group slugs granted on acceptance
    created_by   TEXT,
    created_at   TEXT NOT NULL,
    expires_at   TEXT NOT NULL,
    used_at      TEXT,
    identity_id  TEXT
);

CREATE TABLE groups (
    slug      TEXT PRIMARY KEY,
    name      TEXT NOT NULL,
    parent    TEXT,
    policy    TEXT NOT NULL,                 -- g1-members | managed
    hidden    INTEGER NOT NULL DEFAULT 0,
    position  INTEGER NOT NULL
);

CREATE TABLE memberships (
    group_slug   TEXT NOT NULL REFERENCES groups(slug),
    identity_id  TEXT NOT NULL REFERENCES identities(id),
    granted_by   TEXT,
    granted_at   TEXT NOT NULL,
    PRIMARY KEY (group_slug, identity_id)
);

CREATE TABLE documents (
    id            TEXT PRIMARY KEY,
    group_slug    TEXT NOT NULL REFERENCES groups(slug),
    slug          TEXT NOT NULL,
    title         TEXT NOT NULL,             -- JSON {lang: text}
    summary       TEXT NOT NULL,             -- JSON {lang: text}
    source_lang   TEXT NOT NULL,
    vote_floor    REAL NOT NULL,             -- C, minimal number of "for" votes
    publish_path  TEXT,                      -- path in the texts repository; NULL = never published
    created_at    TEXT NOT NULL,
    UNIQUE (group_slug, slug)
);

CREATE TABLE units (
    id           TEXT PRIMARY KEY,
    doc_id       TEXT NOT NULL REFERENCES documents(id),
    code         TEXT NOT NULL,
    section      TEXT,                       -- grouping key of the seed (introduction, technique…)
    position     REAL NOT NULL,
    inertia      TEXT NOT NULL,              -- low | standard | high | max
    in_force_id  TEXT,                       -- proposals.id of the version in force, NULL = empty slot
    created_at   TEXT NOT NULL
);
CREATE INDEX units_doc ON units(doc_id);

-- A proposal is a version of a unit: proposed, in force, or past.
CREATE TABLE proposals (
    id              TEXT PRIMARY KEY,
    unit_id         TEXT NOT NULL REFERENCES units(id),
    kind            TEXT NOT NULL,           -- text | remove | inertia
    inertia_target  TEXT,
    title           TEXT NOT NULL,
    body            TEXT NOT NULL,
    status          TEXT NOT NULL,           -- draft | open | in_force | superseded | withdrawn
    origin          TEXT NOT NULL,           -- seed | member
    label           TEXT,
    author_id       TEXT REFERENCES identities(id),
    revision        INTEGER NOT NULL DEFAULT 1,
    created_at      TEXT NOT NULL,
    updated_at      TEXT NOT NULL,
    submitted_at    TEXT,
    entered_at      TEXT,                    -- entered into force by vote; NULL for a seed a minima
    left_at         TEXT,
    confirmed_at    TEXT                     -- a seed a minima that later reached its threshold
);
CREATE INDEX proposals_unit ON proposals(unit_id);

CREATE TABLE revisions (
    id           INTEGER PRIMARY KEY AUTOINCREMENT,
    proposal_id  TEXT NOT NULL REFERENCES proposals(id),
    revision     INTEGER NOT NULL,
    kind         TEXT NOT NULL,              -- initial | typo | substantive
    title        TEXT NOT NULL,
    body         TEXT NOT NULL,
    author_id    TEXT,
    created_at   TEXT NOT NULL
);
CREATE INDEX revisions_proposal ON revisions(proposal_id);

CREATE TABLE votes (
    proposal_id  TEXT NOT NULL REFERENCES proposals(id),
    identity_id  TEXT NOT NULL REFERENCES identities(id),
    choice       TEXT NOT NULL,              -- for | against
    revision     INTEGER NOT NULL,           -- counted only while equal to proposals.revision
    cast_at      TEXT NOT NULL,
    PRIMARY KEY (proposal_id, identity_id)
);

CREATE TABLE signals (
    id                  TEXT PRIMARY KEY,
    proposal_id         TEXT NOT NULL REFERENCES proposals(id),
    target_proposal_id  TEXT NOT NULL REFERENCES proposals(id),
    reason              TEXT NOT NULL,
    author_id           TEXT NOT NULL REFERENCES identities(id),
    created_at          TEXT NOT NULL,
    lifted_at           TEXT,
    lifted_by           TEXT                 -- identity id, or 'revision' when the text changed
);

CREATE TABLE translations (
    proposal_id  TEXT NOT NULL REFERENCES proposals(id),
    lang         TEXT NOT NULL,
    title        TEXT NOT NULL,
    body         TEXT NOT NULL,
    source_hash  TEXT NOT NULL,              -- hash of the source title + body it translates
    origin       TEXT NOT NULL,              -- seed | member
    updated_by   TEXT,
    updated_at   TEXT NOT NULL,
    PRIMARY KEY (proposal_id, lang)
);

CREATE TABLE adoptions (
    id             INTEGER PRIMARY KEY AUTOINCREMENT,
    proposal_id    TEXT NOT NULL,
    unit_id        TEXT NOT NULL,
    doc_id         TEXT NOT NULL,
    kind           TEXT NOT NULL,
    votes_for      INTEGER NOT NULL,
    votes_against  INTEGER NOT NULL,
    electorate     INTEGER NOT NULL,
    required       INTEGER NOT NULL,
    params         TEXT NOT NULL,
    at             TEXT NOT NULL
);

CREATE TABLE outbox (
    id          INTEGER PRIMARY KEY AUTOINCREMENT,
    doc_id      TEXT NOT NULL,
    reason      TEXT NOT NULL,
    created_at  TEXT NOT NULL,
    attempts    INTEGER NOT NULL DEFAULT 0,
    last_error  TEXT,
    next_at     TEXT NOT NULL,
    done_at     TEXT,
    commit_sha  TEXT
);

CREATE TABLE feedback (
    id           INTEGER PRIMARY KEY AUTOINCREMENT,
    identity_id  TEXT,
    route        TEXT NOT NULL,
    body         TEXT NOT NULL,
    context      TEXT,
    created_at   TEXT NOT NULL,
    status       TEXT NOT NULL DEFAULT 'new'
);

CREATE TABLE settings (
    key         TEXT PRIMARY KEY,
    value       TEXT NOT NULL,
    updated_at  TEXT NOT NULL
);