-- AP0.4: Feature, Prompt, Placeholder and Configuration registries

CREATE TABLE features (
    feature_key VARCHAR(128) PRIMARY KEY,
    module VARCHAR(64) NOT NULL,
    name VARCHAR(255) NOT NULL,
    description TEXT NOT NULL DEFAULT '',
    is_active BOOLEAN NOT NULL DEFAULT TRUE,
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE TABLE prompt_definitions (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    prompt_key VARCHAR(128) NOT NULL UNIQUE,
    name VARCHAR(255) NOT NULL,
    purpose TEXT NOT NULL DEFAULT '',
    context_kind VARCHAR(64) NOT NULL,
    execution_mode VARCHAR(32) NOT NULL DEFAULT 'single'
        CHECK (execution_mode IN ('single', 'pipeline', 'workflow')),
    status VARCHAR(32) NOT NULL DEFAULT 'active'
        CHECK (status IN ('draft', 'active', 'archived')),
    active_version_id UUID,
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE TABLE prompt_versions (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    prompt_definition_id UUID NOT NULL REFERENCES prompt_definitions(id) ON DELETE CASCADE,
    version VARCHAR(64) NOT NULL,
    body TEXT NOT NULL DEFAULT '',
    input_schema JSONB,
    output_schema JSONB,
    model_policy_key VARCHAR(128),
    created_by UUID REFERENCES users(id) ON DELETE SET NULL,
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    changelog TEXT NOT NULL DEFAULT '',
    UNIQUE (prompt_definition_id, version)
);

ALTER TABLE prompt_definitions
    ADD CONSTRAINT fk_prompt_definitions_active_version
    FOREIGN KEY (active_version_id) REFERENCES prompt_versions(id) ON DELETE SET NULL;

CREATE TABLE prompt_steps (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    prompt_version_id UUID NOT NULL REFERENCES prompt_versions(id) ON DELETE CASCADE,
    step_key VARCHAR(128) NOT NULL,
    step_order INT NOT NULL DEFAULT 0,
    step_type VARCHAR(32) NOT NULL DEFAULT 'template'
        CHECK (step_type IN ('template', 'resolver', 'llm_call', 'postprocess', 'validation')),
    template_body TEXT NOT NULL DEFAULT '',
    input_mapping JSONB,
    output_mapping JSONB,
    enabled BOOLEAN NOT NULL DEFAULT TRUE,
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    UNIQUE (prompt_version_id, step_key)
);

CREATE INDEX idx_prompt_steps_version_order
    ON prompt_steps(prompt_version_id, step_order);

CREATE TABLE placeholder_definitions (
    placeholder_key VARCHAR(128) NOT NULL,
    context_kind VARCHAR(64) NOT NULL,
    value_type VARCHAR(32) NOT NULL DEFAULT 'string'
        CHECK (value_type IN ('string', 'number', 'boolean', 'object', 'array', 'json')),
    description TEXT NOT NULL DEFAULT '',
    required BOOLEAN NOT NULL DEFAULT FALSE,
    source VARCHAR(64) NOT NULL DEFAULT 'input',
    is_active BOOLEAN NOT NULL DEFAULT TRUE,
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    PRIMARY KEY (placeholder_key, context_kind)
);

CREATE TABLE configuration_entries (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    config_key VARCHAR(128) NOT NULL,
    scope VARCHAR(32) NOT NULL DEFAULT 'global'
        CHECK (scope IN ('global', 'tenant')),
    tenant_id UUID REFERENCES tenants(id) ON DELETE CASCADE,
    value JSONB NOT NULL DEFAULT '{}',
    value_type VARCHAR(32) NOT NULL DEFAULT 'string'
        CHECK (value_type IN ('string', 'number', 'boolean', 'object', 'array', 'json')),
    description TEXT NOT NULL DEFAULT '',
    is_secret BOOLEAN NOT NULL DEFAULT FALSE,
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    CHECK (
        (scope = 'global' AND tenant_id IS NULL)
        OR (scope = 'tenant' AND tenant_id IS NOT NULL)
    )
);

CREATE UNIQUE INDEX uq_configuration_entries_global
    ON configuration_entries (config_key)
    WHERE scope = 'global';

CREATE UNIQUE INDEX uq_configuration_entries_tenant
    ON configuration_entries (config_key, tenant_id)
    WHERE scope = 'tenant';

CREATE TABLE prompt_execution_logs (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    prompt_definition_id UUID REFERENCES prompt_definitions(id) ON DELETE SET NULL,
    prompt_version_id UUID REFERENCES prompt_versions(id) ON DELETE SET NULL,
    execution_mode VARCHAR(32) NOT NULL,
    status VARCHAR(32) NOT NULL
        CHECK (status IN ('success', 'error', 'skipped')),
    rendered_preview TEXT,
    input_summary JSONB,
    error_message TEXT,
    created_by UUID REFERENCES users(id) ON DELETE SET NULL,
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE INDEX idx_prompt_execution_logs_created
    ON prompt_execution_logs(created_at DESC);