PRAGMA foreign_keys = ON;

CREATE TABLE IF NOT EXISTS schema_migrations (
    version INTEGER PRIMARY KEY,
    applied_at TEXT NOT NULL
);

CREATE TABLE projects (
    project_id TEXT PRIMARY KEY,
    name TEXT NOT NULL,
    description TEXT NOT NULL DEFAULT '',
    created_at TEXT NOT NULL
);

CREATE TABLE actors (
    actor_id TEXT PRIMARY KEY,
    auth_subject TEXT NOT NULL UNIQUE,
    display_name TEXT NOT NULL,
    created_at TEXT NOT NULL
);

CREATE TABLE project_memberships (
    project_id TEXT NOT NULL REFERENCES projects(project_id),
    actor_id TEXT NOT NULL REFERENCES actors(actor_id),
    role TEXT NOT NULL CHECK (role IN (
        'SYSTEM','PO','PM','PA','ARCHITECT','LEAD_ENGINEER',
        'IMPLEMENTER','REVIEWER','SECURITY_REVIEWER','OBSERVER'
    )),
    active INTEGER NOT NULL DEFAULT 1 CHECK (active IN (0, 1)),
    created_at TEXT NOT NULL,
    PRIMARY KEY (project_id, actor_id)
);

CREATE TABLE work_packages (
    project_id TEXT NOT NULL REFERENCES projects(project_id),
    work_package_id TEXT NOT NULL,
    title TEXT NOT NULL,
    description TEXT NOT NULL,
    acceptance_criteria_json TEXT NOT NULL,
    status TEXT NOT NULL CHECK (status IN (
        'OPEN','CLAIMED','RESULT_SUBMITTED','IN_REVIEW','REVIEWED',
        'ACCEPTED','REJECTED','CANCELLED'
    )),
    issued_by TEXT NOT NULL REFERENCES actors(actor_id),
    claimed_by TEXT REFERENCES actors(actor_id),
    result_submitted_by TEXT REFERENCES actors(actor_id),
    result_json TEXT,
    accepted_by TEXT REFERENCES actors(actor_id),
    created_at TEXT NOT NULL,
    updated_at TEXT NOT NULL,
    PRIMARY KEY (project_id, work_package_id)
);
CREATE INDEX work_packages_project_status
    ON work_packages(project_id, status, updated_at);

CREATE TABLE review_requests (
    project_id TEXT NOT NULL REFERENCES projects(project_id),
    review_id TEXT NOT NULL,
    work_package_id TEXT NOT NULL,
    requested_by TEXT NOT NULL REFERENCES actors(actor_id),
    reviewer_id TEXT NOT NULL REFERENCES actors(actor_id),
    review_type TEXT NOT NULL,
    status TEXT NOT NULL CHECK (status IN ('OPEN','SUBMITTED')),
    verdict TEXT CHECK (verdict IN ('APPROVE','CHANGES_REQUESTED','REJECT')),
    findings_json TEXT,
    created_at TEXT NOT NULL,
    submitted_at TEXT,
    PRIMARY KEY (project_id, review_id),
    FOREIGN KEY (project_id, work_package_id)
        REFERENCES work_packages(project_id, work_package_id)
);
CREATE INDEX review_requests_project_status
    ON review_requests(project_id, status, reviewer_id);

CREATE TABLE decisions (
    project_id TEXT NOT NULL REFERENCES projects(project_id),
    decision_id TEXT NOT NULL,
    kind TEXT NOT NULL CHECK (kind IN ('PRODUCT','ARCHITECTURE','OPERATIONAL','GATE')),
    title TEXT NOT NULL,
    decision TEXT NOT NULL,
    rationale TEXT NOT NULL,
    decided_by TEXT NOT NULL REFERENCES actors(actor_id),
    work_package_id TEXT,
    created_at TEXT NOT NULL,
    PRIMARY KEY (project_id, decision_id),
    FOREIGN KEY (project_id, work_package_id)
        REFERENCES work_packages(project_id, work_package_id)
);

CREATE TABLE escalations (
    project_id TEXT NOT NULL REFERENCES projects(project_id),
    escalation_id TEXT NOT NULL,
    raised_by TEXT NOT NULL REFERENCES actors(actor_id),
    severity TEXT NOT NULL CHECK (severity IN ('LOW','MEDIUM','HIGH','CRITICAL')),
    title TEXT NOT NULL,
    description TEXT NOT NULL,
    status TEXT NOT NULL CHECK (status IN ('OPEN','RESOLVED')),
    target_role TEXT,
    resolution TEXT,
    resolved_by TEXT REFERENCES actors(actor_id),
    created_at TEXT NOT NULL,
    resolved_at TEXT,
    PRIMARY KEY (project_id, escalation_id)
);

CREATE TABLE event_log (
    cursor INTEGER PRIMARY KEY AUTOINCREMENT,
    event_id TEXT NOT NULL UNIQUE,
    project_id TEXT NOT NULL REFERENCES projects(project_id),
    event_type TEXT NOT NULL,
    actor_id TEXT NOT NULL REFERENCES actors(actor_id),
    actor_role TEXT NOT NULL,
    aggregate_type TEXT NOT NULL,
    aggregate_id TEXT NOT NULL,
    correlation_id TEXT,
    causation_event_id TEXT,
    payload_json TEXT NOT NULL,
    created_at TEXT NOT NULL
);
CREATE INDEX event_log_project_cursor ON event_log(project_id, cursor);
CREATE INDEX event_log_aggregate ON event_log(project_id, aggregate_type, aggregate_id, cursor);

CREATE TRIGGER event_log_no_update
BEFORE UPDATE ON event_log
BEGIN
    SELECT RAISE(ABORT, 'event_log is append-only');
END;

CREATE TRIGGER event_log_no_delete
BEFORE DELETE ON event_log
BEGIN
    SELECT RAISE(ABORT, 'event_log is append-only');
END;

CREATE TABLE idempotency_records (
    project_id TEXT NOT NULL,
    actor_id TEXT NOT NULL,
    idempotency_key TEXT NOT NULL,
    operation TEXT NOT NULL,
    request_hash TEXT NOT NULL,
    response_json TEXT NOT NULL,
    created_at TEXT NOT NULL,
    PRIMARY KEY (project_id, actor_id, idempotency_key)
);