CREATE TABLE IF NOT EXISTS users (
    id            UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    email         TEXT NOT NULL UNIQUE,
    password_hash TEXT NOT NULL,
    name          TEXT NOT NULL,
    role          TEXT NOT NULL CHECK (role IN ('tenant_admin', 'manager', 'technician')),
    active        BOOLEAN NOT NULL DEFAULT true,
    created_at    TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE TABLE IF NOT EXISTS clients (
    id         UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    name       TEXT NOT NULL,
    nif        TEXT,
    phone      TEXT,
    email      TEXT,
    address    TEXT,
    notes      TEXT,
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE TABLE IF NOT EXISTS vehicles (
    id         UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    client_id  UUID REFERENCES clients(id) ON DELETE SET NULL,
    plate      TEXT NOT NULL,
    brand      TEXT NOT NULL,
    model      TEXT NOT NULL,
    year       INT,
    vin        TEXT,
    mileage    INT,
    notes      TEXT,
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE TABLE IF NOT EXISTS staff (
    id          UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    user_id     UUID REFERENCES users(id) ON DELETE SET NULL,
    name        TEXT NOT NULL,
    email       TEXT,
    phone       TEXT,
    type        TEXT NOT NULL CHECK (type IN ('internal', 'external')),
    hourly_rate NUMERIC(10,2) NOT NULL DEFAULT 0,
    active      BOOLEAN NOT NULL DEFAULT true,
    created_at  TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE TABLE IF NOT EXISTS catalog_items (
    id         UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    code       TEXT NOT NULL UNIQUE,
    name       TEXT NOT NULL,
    category   TEXT NOT NULL,
    unit       TEXT NOT NULL CHECK (unit IN ('un', 'hora', 'litro', 'kg')),
    base_price NUMERIC(10,2) NOT NULL DEFAULT 0,
    active     BOOLEAN NOT NULL DEFAULT true,
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE TABLE IF NOT EXISTS work_orders (
    id             UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    number         SERIAL UNIQUE,
    client_id      UUID REFERENCES clients(id) ON DELETE SET NULL,
    vehicle_id     UUID REFERENCES vehicles(id) ON DELETE SET NULL,
    status         TEXT NOT NULL DEFAULT 'open' CHECK (status IN ('open', 'in_progress', 'completed', 'invoiced', 'cancelled')),
    internal_notes TEXT,
    client_notes   TEXT,
    created_by     UUID REFERENCES users(id) ON DELETE SET NULL,
    created_at     TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at     TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE TABLE IF NOT EXISTS wo_items (
    id              UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    work_order_id   UUID NOT NULL REFERENCES work_orders(id) ON DELETE CASCADE,
    catalog_item_id UUID REFERENCES catalog_items(id) ON DELETE SET NULL,
    description     TEXT NOT NULL,
    qty             NUMERIC(10,3) NOT NULL DEFAULT 1,
    unit_price      NUMERIC(10,2) NOT NULL,
    discount_pct    NUMERIC(5,2) NOT NULL DEFAULT 0,
    total           NUMERIC(10,2) GENERATED ALWAYS AS (qty * unit_price * (1 - discount_pct / 100)) STORED
);

CREATE TABLE IF NOT EXISTS wo_staff_hours (
    id            UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    work_order_id UUID NOT NULL REFERENCES work_orders(id) ON DELETE CASCADE,
    staff_id      UUID NOT NULL REFERENCES staff(id) ON DELETE RESTRICT,
    hours         NUMERIC(6,2) NOT NULL,
    cost_per_hour NUMERIC(10,2) NOT NULL,
    total         NUMERIC(10,2) GENERATED ALWAYS AS (hours * cost_per_hour) STORED
);

CREATE TABLE IF NOT EXISTS wo_status_log (
    id            UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    work_order_id UUID NOT NULL REFERENCES work_orders(id) ON DELETE CASCADE,
    from_status   TEXT,
    to_status     TEXT NOT NULL,
    changed_by    UUID REFERENCES users(id) ON DELETE SET NULL,
    changed_at    TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE TABLE IF NOT EXISTS invoices (
    id            UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    work_order_id UUID NOT NULL REFERENCES work_orders(id) ON DELETE RESTRICT,
    type          TEXT NOT NULL CHECK (type IN ('quote', 'invoice')),
    number        SERIAL UNIQUE,
    pdf_path      TEXT,
    issued_at     TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE TABLE IF NOT EXISTS expenses (
    id          UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    vehicle_id  UUID REFERENCES vehicles(id) ON DELETE SET NULL,
    type        TEXT NOT NULL CHECK (type IN ('fuel', 'parts', 'tools', 'other')),
    amount      NUMERIC(10,2) NOT NULL,
    description TEXT,
    date        DATE NOT NULL,
    created_at  TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE TABLE IF NOT EXISTS tenant_settings (
    key        TEXT PRIMARY KEY,
    value      TEXT NOT NULL,
    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE INDEX IF NOT EXISTS idx_work_orders_status    ON work_orders(status);
CREATE INDEX IF NOT EXISTS idx_work_orders_client_id ON work_orders(client_id);
CREATE INDEX IF NOT EXISTS idx_vehicles_client_id    ON vehicles(client_id);
CREATE INDEX IF NOT EXISTS idx_vehicles_plate        ON vehicles(plate);
CREATE INDEX IF NOT EXISTS idx_expenses_date         ON expenses(date);