-- Migration 018: .kc Server-Side Metadata Tables
--
-- Adds tables for indexing the silo/ directory contents from .kc files.
-- See docs/KC_SERVER.md for the full specification.
--
-- Tables:
--   item_metadata        - indexed manifest + metadata fields (Section 3.1)
--   item_dependencies    - CAD-extracted assembly dependencies (Section 3.2)
--   item_approvals       - ECO workflow state (Section 3.3)
--   approval_signatures  - individual approval/rejection records (Section 3.3)
--   item_macros          - registered macros from silo/macros/ (Section 3.4)

BEGIN;

--------------------------------------------------------------------------------
-- item_metadata: indexed silo/manifest.json + silo/metadata.json
--------------------------------------------------------------------------------

CREATE TABLE item_metadata (
    item_id         UUID PRIMARY KEY REFERENCES items(id) ON DELETE CASCADE,
    schema_name     TEXT,
    tags            TEXT[] NOT NULL DEFAULT '{}',
    lifecycle_state TEXT NOT NULL DEFAULT 'draft',
    fields          JSONB NOT NULL DEFAULT '{}',
    kc_version      TEXT,
    manifest_uuid   UUID,
    silo_instance   TEXT,
    revision_hash   TEXT,
    updated_at      TIMESTAMPTZ NOT NULL DEFAULT now(),
    updated_by      TEXT
);

CREATE INDEX idx_item_metadata_tags ON item_metadata USING GIN (tags);
CREATE INDEX idx_item_metadata_lifecycle ON item_metadata (lifecycle_state);
CREATE INDEX idx_item_metadata_fields ON item_metadata USING GIN (fields);

--------------------------------------------------------------------------------
-- item_dependencies: indexed silo/dependencies.json
--
-- Complements the existing `relationships` table.
--   relationships    = server-authoritative BOM (web UI / API editable)
--   item_dependencies = CAD-authoritative record (extracted from .kc)
-- BOM merge reconciles the two (see docs/BOM_MERGE.md).
--------------------------------------------------------------------------------

CREATE TABLE item_dependencies (
    id                UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    parent_item_id    UUID NOT NULL REFERENCES items(id) ON DELETE CASCADE,
    child_uuid        UUID NOT NULL,
    child_part_number TEXT,
    child_revision    INTEGER,
    quantity          DECIMAL,
    label             TEXT,
    relationship      TEXT NOT NULL DEFAULT 'component',
    revision_number   INTEGER NOT NULL,
    created_at        TIMESTAMPTZ NOT NULL DEFAULT now()
);

CREATE INDEX idx_item_deps_parent ON item_dependencies (parent_item_id);
CREATE INDEX idx_item_deps_child ON item_dependencies (child_uuid);

--------------------------------------------------------------------------------
-- item_approvals + approval_signatures: ECO workflow
--
-- Server-authoritative. The .kc silo/approvals.json is a read cache
-- packed on checkout for offline display in Create.
--------------------------------------------------------------------------------

CREATE TABLE item_approvals (
    id          UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    item_id     UUID NOT NULL REFERENCES items(id) ON DELETE CASCADE,
    eco_number  TEXT,
    state       TEXT NOT NULL DEFAULT 'draft',
    updated_at  TIMESTAMPTZ NOT NULL DEFAULT now(),
    updated_by  TEXT
);

CREATE INDEX idx_item_approvals_item ON item_approvals (item_id);
CREATE INDEX idx_item_approvals_state ON item_approvals (state);

CREATE TABLE approval_signatures (
    id          UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    approval_id UUID NOT NULL REFERENCES item_approvals(id) ON DELETE CASCADE,
    username    TEXT NOT NULL,
    role        TEXT NOT NULL,
    status      TEXT NOT NULL DEFAULT 'pending',
    signed_at   TIMESTAMPTZ,
    comment     TEXT
);

CREATE INDEX idx_approval_sigs_approval ON approval_signatures (approval_id);

--------------------------------------------------------------------------------
-- item_macros: registered macros from silo/macros/
--------------------------------------------------------------------------------

CREATE TABLE item_macros (
    id              UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    item_id         UUID NOT NULL REFERENCES items(id) ON DELETE CASCADE,
    filename        TEXT NOT NULL,
    trigger         TEXT NOT NULL DEFAULT 'manual',
    content         TEXT NOT NULL,
    revision_number INTEGER NOT NULL,
    created_at      TIMESTAMPTZ NOT NULL DEFAULT now(),
    UNIQUE(item_id, filename)
);

CREATE INDEX idx_item_macros_item ON item_macros (item_id);

COMMIT;