-- topology_api/migrations/006_presentation_styles.sql
-- Database-driven presentation semantics for topology diagrams.

CREATE TABLE IF NOT EXISTS topology.diagram_themes (
    id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
    base_id uuid NOT NULL REFERENCES topology.bases(id) ON DELETE CASCADE,
    theme_key text NOT NULL,
    name text NOT NULL,
    description text,
    tokens jsonb NOT NULL DEFAULT '{}'::jsonb,
    is_default boolean NOT NULL DEFAULT false,
    created_at timestamptz NOT NULL DEFAULT now(),
    updated_at timestamptz NOT NULL DEFAULT now(),
    CONSTRAINT uq_diagram_themes_base_key UNIQUE (base_id, theme_key)
);

CREATE UNIQUE INDEX IF NOT EXISTS uq_diagram_themes_default_per_base
    ON topology.diagram_themes(base_id)
    WHERE is_default;

CREATE TABLE IF NOT EXISTS topology.diagram_node_styles (
    id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
    theme_id uuid NOT NULL REFERENCES topology.diagram_themes(id) ON DELETE CASCADE,
    style_key text NOT NULL,
    display_name text NOT NULL,
    fill_color text NOT NULL,
    stroke_color text NOT NULL,
    stroke_width numeric NOT NULL,
    corner_radius numeric NOT NULL DEFAULT 16,
    title_color text,
    meta_color text,
    hint_color text,
    created_at timestamptz NOT NULL DEFAULT now(),
    updated_at timestamptz NOT NULL DEFAULT now(),
    CONSTRAINT uq_diagram_node_styles_theme_key UNIQUE (theme_id, style_key),
    CONSTRAINT ck_diagram_node_stroke_width CHECK (stroke_width >= 0),
    CONSTRAINT ck_diagram_node_corner_radius CHECK (corner_radius >= 0)
);

CREATE TABLE IF NOT EXISTS topology.diagram_edge_styles (
    id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
    theme_id uuid NOT NULL REFERENCES topology.diagram_themes(id) ON DELETE CASCADE,
    connection_type text NOT NULL,
    display_name text NOT NULL,
    stroke_color text NOT NULL,
    stroke_width numeric NOT NULL,
    dash_array text,
    line_cap text NOT NULL DEFAULT 'square',
    legend_group text,
    legend_order integer NOT NULL DEFAULT 0,
    created_at timestamptz NOT NULL DEFAULT now(),
    updated_at timestamptz NOT NULL DEFAULT now(),
    CONSTRAINT uq_diagram_edge_styles_theme_type UNIQUE (theme_id, connection_type),
    CONSTRAINT ck_diagram_edge_stroke_width CHECK (stroke_width >= 0),
    CONSTRAINT ck_diagram_edge_line_cap CHECK (line_cap IN ('butt', 'round', 'square')),
    CONSTRAINT ck_diagram_edge_dash_array CHECK (
        dash_array IS NULL OR dash_array ~ '^[0-9]+( [0-9]+)*$'
    )
);

CREATE TABLE IF NOT EXISTS topology.diagram_decoration_styles (
    id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
    theme_id uuid NOT NULL REFERENCES topology.diagram_themes(id) ON DELETE CASCADE,
    decoration_key text NOT NULL,
    display_name text NOT NULL,
    fill_color text NOT NULL,
    stroke_color text NOT NULL,
    stroke_width numeric NOT NULL,
    label text,
    label_color text,
    render_params jsonb NOT NULL DEFAULT '{}'::jsonb,
    legend_order integer NOT NULL DEFAULT 0,
    created_at timestamptz NOT NULL DEFAULT now(),
    updated_at timestamptz NOT NULL DEFAULT now(),
    CONSTRAINT uq_diagram_decoration_styles_theme_key UNIQUE (theme_id, decoration_key),
    CONSTRAINT ck_diagram_decoration_stroke_width CHECK (stroke_width >= 0)
);

CREATE TABLE IF NOT EXISTS topology.diagram_legend_items (
    id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
    theme_id uuid NOT NULL REFERENCES topology.diagram_themes(id) ON DELETE CASCADE,
    legend_key text NOT NULL,
    label text NOT NULL,
    item_type text NOT NULL,
    style_ref text NOT NULL,
    display_order integer NOT NULL DEFAULT 0,
    is_visible boolean NOT NULL DEFAULT true,
    created_at timestamptz NOT NULL DEFAULT now(),
    updated_at timestamptz NOT NULL DEFAULT now(),
    CONSTRAINT uq_diagram_legend_items_theme_key UNIQUE (theme_id, legend_key),
    CONSTRAINT ck_diagram_legend_item_type CHECK (item_type IN ('edge', 'decoration', 'node'))
);

ALTER TABLE topology.diagram_layouts
    ADD COLUMN IF NOT EXISTS theme_id uuid REFERENCES topology.diagram_themes(id);