-- ============================================================
-- DRE Customer Portal — SQLite Schema (spec §1)
-- DB file: /opt/dre-portal/data/dre.db
-- Pragmas (set on every connection): foreign_keys=ON, journal_mode=WAL, busy_timeout=5000
-- All timestamps ISO-8601 UTC TEXT. Money as INTEGER cents. PKs TEXT UUID4.
-- ============================================================

CREATE TABLE IF NOT EXISTS clients (
    id                TEXT PRIMARY KEY,              -- uuid4
    client_number     TEXT UNIQUE NOT NULL,          -- CLT-YYYY-NNNN
    company_name      TEXT NOT NULL,
    contact_name      TEXT NOT NULL,
    email             TEXT UNIQUE NOT NULL,          -- lowercased; magic-link identity
    phone             TEXT,
    tos_accepted_at   TEXT,                          -- set when ToS accepted at intake
    twentycrm_id      TEXT,                          -- nullable; set by future CRM sync
    created_at        TEXT NOT NULL,
    updated_at        TEXT NOT NULL
);
CREATE INDEX IF NOT EXISTS idx_clients_email ON clients(email);

CREATE TABLE IF NOT EXISTS debtors (
    id                TEXT PRIMARY KEY,              -- uuid4
    name              TEXT NOT NULL,                 -- business or individual name
    business_type     TEXT NOT NULL DEFAULT 'OTHER'
                      CHECK (business_type IN
                        ('INDIVIDUAL','SOLE_PROPRIETORSHIP','LLC','CORPORATION','PARTNERSHIP','OTHER')),
    contact_email     TEXT,
    contact_phone     TEXT,
    physical_address  TEXT,                          -- free-text single line
    twentycrm_id      TEXT,                          -- nullable
    created_at        TEXT NOT NULL,
    updated_at        TEXT NOT NULL
);

CREATE TABLE IF NOT EXISTS claims (
    id                  TEXT PRIMARY KEY,            -- uuid4
    claim_number        TEXT UNIQUE NOT NULL,        -- DRE-YYYY-NNNN
    client_id           TEXT NOT NULL REFERENCES clients(id) ON DELETE RESTRICT,
    debtor_id           TEXT NOT NULL REFERENCES debtors(id) ON DELETE RESTRICT,
    amount_cents        INTEGER NOT NULL CHECK (amount_cents > 0),
    currency            TEXT NOT NULL DEFAULT 'USD',
    status              TEXT NOT NULL DEFAULT 'NEW'
                        CHECK (status IN
                          ('NEW','UNDER_REVIEW','ACTIVE','NEGOTIATION','LEGAL','SETTLED','CLOSED','WRITE_OFF','REJECTED')),
    tier                TEXT NOT NULL DEFAULT 'TIER_1'
                        CHECK (tier IN ('TIER_1','TIER_2','TIER_2_5','TIER_3','TIER_4')),
    description         TEXT,
    client_reference    TEXT,
    invoice_date       TEXT,                          -- ISO date
    date_assigned       TEXT,                         -- set when moved out of NEW
    date_resolved       TEXT,                         -- set on SETTLED/CLOSED/WRITE_OFF
    twentycrm_id        TEXT,                         -- nullable
    created_at          TEXT NOT NULL,
    updated_at          TEXT NOT NULL
);
CREATE INDEX IF NOT EXISTS idx_claims_client ON claims(client_id);
CREATE INDEX IF NOT EXISTS idx_claims_status ON claims(status);
CREATE INDEX IF NOT EXISTS idx_claims_debtor ON claims(debtor_id);

CREATE TABLE IF NOT EXISTS documents (
    id                TEXT PRIMARY KEY,              -- uuid4
    claim_id          TEXT NOT NULL REFERENCES claims(id) ON DELETE CASCADE,
    original_name     TEXT NOT NULL,                 -- sanitized display name
    stored_path       TEXT NOT NULL,                 -- absolute path on disk (uuid-named)
    mime_type         TEXT NOT NULL,
    size_bytes        INTEGER NOT NULL,
    sha256            TEXT NOT NULL,                 -- integrity + dedupe
    uploaded_by       TEXT NOT NULL DEFAULT 'CLIENT' -- CLIENT | STAFF
                      CHECK (uploaded_by IN ('CLIENT','STAFF')),
    twentycrm_id      TEXT,                          -- nullable
    created_at        TEXT NOT NULL
);
CREATE INDEX IF NOT EXISTS idx_documents_claim ON documents(claim_id);

CREATE TABLE IF NOT EXISTS case_notes (
    id                TEXT PRIMARY KEY,              -- uuid4
    claim_id          TEXT NOT NULL REFERENCES claims(id) ON DELETE CASCADE,
    author_type       TEXT NOT NULL
                      CHECK (author_type IN ('CLIENT','STAFF','SYSTEM')),
    author_name       TEXT NOT NULL,
    subject           TEXT,                          -- for client->team structured messages
    content           TEXT NOT NULL,                -- plaintext; rendered escaped
    visibility        TEXT NOT NULL DEFAULT 'SHARED'
                      CHECK (visibility IN ('SHARED','INTERNAL')),
    twentycrm_id      TEXT,                          -- nullable
    created_at        TEXT NOT NULL
);
CREATE INDEX IF NOT EXISTS idx_notes_claim ON case_notes(claim_id);

CREATE TABLE IF NOT EXISTS auth_tokens (
    id                TEXT PRIMARY KEY,              -- uuid4
    client_id         TEXT NOT NULL REFERENCES clients(id) ON DELETE CASCADE,
    token_hash        TEXT UNIQUE NOT NULL,          -- sha256 of raw token
    expires_at        TEXT NOT NULL,                 -- created_at + 15 min
    consumed_at       TEXT,                          -- NULL = unused
    requested_ip      TEXT,
    created_at        TEXT NOT NULL
);
CREATE INDEX IF NOT EXISTS idx_tokens_hash ON auth_tokens(token_hash);
CREATE INDEX IF NOT EXISTS idx_tokens_client ON auth_tokens(client_id);

CREATE TABLE IF NOT EXISTS sessions (
    id                TEXT PRIMARY KEY,              -- uuid4
    client_id         TEXT NOT NULL REFERENCES clients(id) ON DELETE CASCADE,
    session_hash      TEXT UNIQUE NOT NULL,          -- sha256 of raw session token
    expires_at        TEXT NOT NULL,                 -- + 7 days
    revoked_at        TEXT,
    created_at        TEXT NOT NULL,
    last_seen_at      TEXT
);
CREATE INDEX IF NOT EXISTS idx_sessions_hash ON sessions(session_hash);

CREATE TABLE IF NOT EXISTS audit_log (
    id                TEXT PRIMARY KEY,              -- uuid4
    entity_type       TEXT NOT NULL,                -- 'claim'|'client'|'document'|'note'
    entity_id         TEXT NOT NULL,
    action            TEXT NOT NULL,                -- 'create'|'status_change'|'update'|'upload'|'note_add'
    field             TEXT,
    old_value         TEXT,
    new_value         TEXT,
    actor             TEXT NOT NULL,
    reason            TEXT,
    created_at        TEXT NOT NULL
);
CREATE INDEX IF NOT EXISTS idx_audit_entity ON audit_log(entity_type, entity_id);

CREATE TABLE IF NOT EXISTS number_sequences (
    prefix            TEXT NOT NULL,                -- 'DRE'|'CLT'
    year              INTEGER NOT NULL,
    last_value        INTEGER NOT NULL DEFAULT 0,
    PRIMARY KEY (prefix, year)
);

-- Migration tracking table
CREATE TABLE IF NOT EXISTS schema_migrations (
    version          TEXT PRIMARY KEY,
    applied_at       TEXT NOT NULL
);