-- ============================================
-- MIGRACIÓN 003: Esquema de Content Items (tes_content)
-- ============================================
-- 
-- Crea las tablas necesarias para content_items en tes_content
-- Unifica el schema para que Content Pack Generator funcione correctamente
-- 
-- IMPORTANTE: Este schema es compatible con el Content Pack Generator
-- que busca tes_content.content_items
--

-- Crear schema si no existe
CREATE SCHEMA IF NOT EXISTS tes_content;

-- Extensión para UUIDs
CREATE EXTENSION IF NOT EXISTS "uuid-ossp";

-- ============================================
-- ENUM: content_status
-- ============================================
CREATE TYPE tes_content.content_status AS ENUM (
  'draft',
  'in_review',
  'approved',
  'published',
  'archived'
);

-- ============================================
-- ENUM: content_priority
-- ============================================
CREATE TYPE tes_content.content_priority AS ENUM (
  'critica',
  'alta',
  'media',
  'baja'
);

-- ============================================
-- TABLA: content_items
-- Propósito: Almacena todos los tipos de contenido (protocolos, guías, etc.)
-- ============================================
CREATE TABLE IF NOT EXISTS tes_content.content_items (
    -- Identificación
    id VARCHAR(100) PRIMARY KEY,
    type VARCHAR(50) NOT NULL,
    slug VARCHAR(200) UNIQUE NOT NULL,
    level VARCHAR(50) NOT NULL,
    
    -- Contenido
    title VARCHAR(500) NOT NULL,
    short_title VARCHAR(200),
    description TEXT,
    content JSONB NOT NULL,
    content_markdown TEXT,
    
    -- Metadatos
    category VARCHAR(100),
    subcategory VARCHAR(100),
    priority tes_content.content_priority,
    age_group VARCHAR(20),
    clinical_context TEXT,
    source_guideline VARCHAR(200),
    
    -- Tags y clasificación
    tags TEXT[],
    
    -- Versionado
    version INTEGER NOT NULL DEFAULT 1,
    latest_version INTEGER NOT NULL DEFAULT 1,
    
    -- Estado y validación
    status tes_content.content_status NOT NULL DEFAULT 'draft',
    validated_by UUID,
    validated_at TIMESTAMPTZ,
    clinical_source VARCHAR(200),
    quality_score INTEGER CHECK (quality_score IS NULL OR (quality_score >= 0 AND quality_score <= 100)),
    
    -- Revisión
    reviewed_by UUID,
    reviewed_at TIMESTAMPTZ,
    
    -- Auditoría
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    created_by UUID NOT NULL,
    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_by UUID NOT NULL,
    
    -- Constraints
    CONSTRAINT chk_type CHECK (type IN ('protocol', 'guide', 'manual', 'checklist')),
    CONSTRAINT chk_level CHECK (level IN ('operativo', 'formativo', 'referencia'))
);

-- Índices para content_items
CREATE INDEX IF NOT EXISTS idx_content_items_type ON tes_content.content_items(type);
CREATE INDEX IF NOT EXISTS idx_content_items_level ON tes_content.content_items(level);
CREATE INDEX IF NOT EXISTS idx_content_items_status ON tes_content.content_items(status);
CREATE INDEX IF NOT EXISTS idx_content_items_category ON tes_content.content_items(category);
CREATE INDEX IF NOT EXISTS idx_content_items_slug ON tes_content.content_items(slug);
CREATE INDEX IF NOT EXISTS idx_content_items_validated_at ON tes_content.content_items(validated_at);
CREATE INDEX IF NOT EXISTS idx_content_items_updated_at ON tes_content.content_items(updated_at);
CREATE INDEX IF NOT EXISTS idx_content_items_content_gin ON tes_content.content_items USING GIN (content);
CREATE INDEX IF NOT EXISTS idx_content_items_title_fts ON tes_content.content_items USING GIN (to_tsvector('spanish', title));

-- ============================================
-- TABLA: content_versions
-- Propósito: Historial de versiones de contenido
-- ============================================
CREATE TABLE IF NOT EXISTS tes_content.content_versions (
    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    content_id VARCHAR(100) NOT NULL,
    version INTEGER NOT NULL,
    
    -- Snapshot del contenido
    content JSONB NOT NULL,
    content_markdown TEXT,
    title VARCHAR(500) NOT NULL,
    
    -- Metadatos de la versión
    status tes_content.content_status NOT NULL,
    validated_by UUID,
    validated_at TIMESTAMPTZ,
    clinical_source VARCHAR(200),
    
    -- Cambios
    change_summary TEXT,
    changed_fields TEXT[],
    
    -- Auditoría
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    created_by UUID NOT NULL,
    
    -- Foreign key
    CONSTRAINT fk_content_versions_content_id 
        FOREIGN KEY (content_id) 
        REFERENCES tes_content.content_items(id) 
        ON DELETE CASCADE,
    
    -- Unique constraint
    CONSTRAINT uq_content_versions_content_version 
        UNIQUE (content_id, version)
);

CREATE INDEX IF NOT EXISTS idx_content_versions_content_id ON tes_content.content_versions(content_id);
CREATE INDEX IF NOT EXISTS idx_content_versions_version ON tes_content.content_versions(version);

-- ============================================
-- TABLA: media_resources
-- Propósito: Recursos multimedia (imágenes, videos)
-- ============================================
CREATE TABLE IF NOT EXISTS tes_content.media_resources (
    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    type VARCHAR(50) NOT NULL,
    path VARCHAR(500) NOT NULL,
    filename VARCHAR(255) NOT NULL,
    file_url VARCHAR(500),
    thumbnail_url VARCHAR(500),
    
    -- Metadatos
    title VARCHAR(500),
    description TEXT,
    alt_text VARCHAR(500),
    caption TEXT,
    tags TEXT[],
    
    -- Clasificación
    block VARCHAR(100),
    chapter VARCHAR(100),
    priority tes_content.content_priority,
    
    -- Propiedades del archivo
    width INTEGER,
    height INTEGER,
    format VARCHAR(50),
    file_size BIGINT,
    duration_seconds INTEGER,
    video_format VARCHAR(50),
    
    -- Estado
    status tes_content.content_status NOT NULL DEFAULT 'draft',
    
    -- Auditoría
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    created_by UUID NOT NULL,
    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_by UUID NOT NULL,
    
    CONSTRAINT chk_media_type CHECK (type IN ('image', 'video', 'audio', 'document'))
);

CREATE INDEX IF NOT EXISTS idx_media_resources_type ON tes_content.media_resources(type);
CREATE INDEX IF NOT EXISTS idx_media_resources_status ON tes_content.media_resources(status);
CREATE INDEX IF NOT EXISTS idx_media_resources_tags ON tes_content.media_resources USING GIN (tags);

-- ============================================
-- TABLA: content_resource_associations
-- Propósito: Asociaciones entre contenido y recursos multimedia
-- ============================================
CREATE TABLE IF NOT EXISTS tes_content.content_resource_associations (
    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    content_item_id VARCHAR(100) NOT NULL,
    media_resource_id UUID NOT NULL,
    
    -- Contexto de la asociación
    section VARCHAR(100),
    position INTEGER NOT NULL DEFAULT 0,
    placement VARCHAR(50),
    caption TEXT,
    is_critical BOOLEAN NOT NULL DEFAULT false,
    priority tes_content.content_priority,
    
    -- Auditoría
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    created_by UUID NOT NULL,
    
    -- Foreign keys
    CONSTRAINT fk_cra_content_item_id 
        FOREIGN KEY (content_item_id) 
        REFERENCES tes_content.content_items(id) 
        ON DELETE CASCADE,
    
    CONSTRAINT fk_cra_media_resource_id 
        FOREIGN KEY (media_resource_id) 
        REFERENCES tes_content.media_resources(id) 
        ON DELETE CASCADE,
    
    CONSTRAINT chk_placement CHECK (placement IN ('before', 'after', 'inline', 'sidebar'))
);

CREATE INDEX IF NOT EXISTS idx_cra_content_item_id ON tes_content.content_resource_associations(content_item_id);
CREATE INDEX IF NOT EXISTS idx_cra_media_resource_id ON tes_content.content_resource_associations(media_resource_id);
CREATE INDEX IF NOT EXISTS idx_cra_position ON tes_content.content_resource_associations(content_item_id, position);

-- ============================================
-- TABLA: audit_logs
-- Propósito: Registro de auditoría de cambios
-- ============================================
CREATE TABLE IF NOT EXISTS tes_content.audit_logs (
    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    user_id UUID NOT NULL,
    entity_type VARCHAR(50) NOT NULL,
    entity_id VARCHAR(100) NOT NULL,
    action VARCHAR(50) NOT NULL,
    changes JSONB,
    metadata JSONB,
    ip_address INET,
    user_agent TEXT,
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    
    CONSTRAINT chk_action CHECK (action IN ('create', 'update', 'delete', 'submit', 'approve', 'reject', 'publish', 'archive'))
);

CREATE INDEX IF NOT EXISTS idx_audit_logs_user_id ON tes_content.audit_logs(user_id);
CREATE INDEX IF NOT EXISTS idx_audit_logs_entity ON tes_content.audit_logs(entity_type, entity_id);
CREATE INDEX IF NOT EXISTS idx_audit_logs_action ON tes_content.audit_logs(action);
CREATE INDEX IF NOT EXISTS idx_audit_logs_created_at ON tes_content.audit_logs(created_at);

-- ============================================
-- COMENTARIOS
-- ============================================
COMMENT ON SCHEMA tes_content IS 'Schema principal para contenido de TES';
COMMENT ON TABLE tes_content.content_items IS 'Tabla principal de contenido (protocolos, guías, etc.)';
COMMENT ON TABLE tes_content.content_versions IS 'Historial de versiones de contenido';
COMMENT ON TABLE tes_content.media_resources IS 'Recursos multimedia (imágenes, videos)';
COMMENT ON TABLE tes_content.content_resource_associations IS 'Asociaciones entre contenido y recursos multimedia';
COMMENT ON TABLE tes_content.audit_logs IS 'Registro de auditoría de cambios';