-- ==========================================
-- CLUB DAGUERRE CAMERA DATABASE
-- Part 3: Content & Media
-- ==========================================

-- ==========================================
-- CONTENT SOURCES (Provenance Tracking)
-- ==========================================
CREATE TABLE content_sources (
  id SERIAL PRIMARY KEY,
  source_name VARCHAR(100) NOT NULL,
  source_type VARCHAR(50) NOT NULL,
  rights_status VARCHAR(50) NOT NULL,
  legal_notes TEXT,
  contact_info TEXT,
  verified_by VARCHAR(100),
  verified_date DATE,
  
  created_at TIMESTAMP NOT NULL DEFAULT NOW(),
  
  CONSTRAINT chk_source_type CHECK (source_type IN ('internal', 'licensed', 'uncertain', 'public_domain')),
  CONSTRAINT chk_rights_status CHECK (rights_status IN ('owned', 'licensed', 'questionable', 'public_domain'))
);

COMMENT ON TABLE content_sources IS 'Provenance tracking for all content';

-- ==========================================
-- IMAGES (Unified with Rights Status)
-- ==========================================
CREATE TABLE images (
  id SERIAL PRIMARY KEY,
  filename VARCHAR(255) NOT NULL,
  sort_order INT NOT NULL DEFAULT 0,
  caption TEXT,
  
  -- FLEXIBLE MULTI-LEVEL LINKING (only ONE should be set)
  manufacturer_id INT REFERENCES manufacturers(id),
  camera_model_id INT REFERENCES camera_models(id),
  housing_variant_id INT REFERENCES housing_variants(id),
  combo_id INT REFERENCES lens_shutter_combos(id),
  
  -- RIGHTS MANAGEMENT
  rights_status VARCHAR(20) NOT NULL,
  source_id INT NOT NULL REFERENCES content_sources(id),
  
  -- Verified images
  photographer VARCHAR(100),
  photo_date DATE,
  rights_holder VARCHAR(200),
  license_type VARCHAR(50),
  
  -- Uncertain images
  why_uncertain TEXT,
  usage_restriction VARCHAR(50),
  clearance_status VARCHAR(50),
  
  -- Metadata
  file_size_kb INT,
  width_px INT,
  height_px INT,
  mime_type VARCHAR(50),
  
  -- Audit
  uploaded_by INT,
  upload_date TIMESTAMP NOT NULL DEFAULT NOW(),
  verified_clean BOOLEAN DEFAULT FALSE,
  verified_by VARCHAR(100),
  verified_date DATE,
  updated_at TIMESTAMP,
  deleted_at TIMESTAMP,
  
  -- Exactly ONE link must be set
  CONSTRAINT chk_image_link CHECK (
    (manufacturer_id IS NOT NULL AND camera_model_id IS NULL AND housing_variant_id IS NULL AND combo_id IS NULL) OR
    (manufacturer_id IS NULL AND camera_model_id IS NOT NULL AND housing_variant_id IS NULL AND combo_id IS NULL) OR
    (manufacturer_id IS NULL AND camera_model_id IS NULL AND housing_variant_id IS NOT NULL AND combo_id IS NULL) OR
    (manufacturer_id IS NULL AND camera_model_id IS NULL AND housing_variant_id IS NULL AND combo_id IS NOT NULL)
  ),
  CONSTRAINT chk_rights_status CHECK (rights_status IN ('verified', 'uncertain', 'restricted')),
  CONSTRAINT chk_uncertain_fields CHECK (
    (rights_status = 'uncertain' AND why_uncertain IS NOT NULL) OR
    (rights_status = 'verified' AND why_uncertain IS NULL)
  ),
  CONSTRAINT chk_sort_order CHECK (sort_order >= 0)
);

-- Indexes for each link type
CREATE INDEX idx_images_manufacturer ON images(manufacturer_id) WHERE manufacturer_id IS NOT NULL;
CREATE INDEX idx_images_model ON images(camera_model_id) WHERE camera_model_id IS NOT NULL;
CREATE INDEX idx_images_variant ON images(housing_variant_id) WHERE housing_variant_id IS NOT NULL;
CREATE INDEX idx_images_combo ON images(combo_id) WHERE combo_id IS NOT NULL;

CREATE INDEX idx_images_source ON images(source_id);
CREATE INDEX idx_images_status ON images(rights_status);

-- Partial indexes for performance
CREATE INDEX idx_images_verified_model ON images(camera_model_id, sort_order) 
WHERE rights_status = 'verified' AND camera_model_id IS NOT NULL;

CREATE INDEX idx_images_uncertain ON images(camera_model_id) 
WHERE rights_status = 'uncertain' AND camera_model_id IS NOT NULL;

CREATE INDEX idx_images_primary ON images(camera_model_id) 
WHERE sort_order = 0 AND rights_status = 'verified' AND camera_model_id IS NOT NULL;

COMMENT ON TABLE images IS 'Images with multi-level linking and rights management';
COMMENT ON COLUMN images.rights_status IS 'verified=publishable, uncertain=research only, restricted=internal only';

-- ==========================================
-- DOCUMENTS (Manuals, Brochures, etc.)
-- ==========================================
CREATE TABLE documents (
  id SERIAL PRIMARY KEY,
  
  -- FLEXIBLE MULTI-LEVEL LINKING (only ONE should be set)
  manufacturer_id INT REFERENCES manufacturers(id),
  camera_model_id INT REFERENCES camera_models(id),
  housing_variant_id INT REFERENCES housing_variants(id),
  combo_id INT REFERENCES lens_shutter_combos(id),
  
  -- Document classification
  document_type VARCHAR(50) NOT NULL,
  
  file_path VARCHAR(500),
  title TEXT,
  language VARCHAR(5),
  page_count INT,
  publication_date DATE,
  
  -- Rights
  rights_status VARCHAR(20) DEFAULT 'safe',
  source_id INT REFERENCES content_sources(id),
  why_safe TEXT,
  
  -- Metadata
  file_size_kb INT,
  mime_type VARCHAR(50),
  
  -- Audit
  uploaded_by INT,
  upload_date TIMESTAMP NOT NULL DEFAULT NOW(),
  updated_at TIMESTAMP,
  deleted_at TIMESTAMP,
  
  -- Exactly ONE link must be set
  CONSTRAINT chk_doc_link CHECK (
    (manufacturer_id IS NOT NULL AND camera_model_id IS NULL AND housing_variant_id IS NULL AND combo_id IS NULL) OR
    (manufacturer_id IS NULL AND camera_model_id IS NOT NULL AND housing_variant_id IS NULL AND combo_id IS NULL) OR
    (manufacturer_id IS NULL AND camera_model_id IS NULL AND housing_variant_id IS NOT NULL AND combo_id IS NULL) OR
    (manufacturer_id IS NULL AND camera_model_id IS NULL AND housing_variant_id IS NULL AND combo_id IS NOT NULL)
  ),
  CONSTRAINT chk_doc_type CHECK (document_type IN (
    'user_manual', 'repair_manual', 'brochure', 'advertisement', 
    'price_list', 'catalog', 'technical_spec', 'patent', 'parts_list'
  ))
);

-- Indexes for each link type
CREATE INDEX idx_docs_manufacturer ON documents(manufacturer_id) WHERE manufacturer_id IS NOT NULL;
CREATE INDEX idx_docs_model ON documents(camera_model_id) WHERE camera_model_id IS NOT NULL;
CREATE INDEX idx_docs_variant ON documents(housing_variant_id) WHERE housing_variant_id IS NOT NULL;
CREATE INDEX idx_docs_combo ON documents(combo_id) WHERE combo_id IS NOT NULL;

CREATE INDEX idx_docs_type ON documents(document_type);
CREATE INDEX idx_docs_language ON documents(language);

COMMENT ON TABLE documents IS 'Documents with multi-level linking - manuals, brochures, repair manuals, etc.';

-- ==========================================
-- ARTICLES
-- ==========================================
CREATE TABLE articles (
  id SERIAL PRIMARY KEY,
  
  -- Publication info
  publication_code VARCHAR(10),
  issue_number INT,
  year INT,
  page INT,
  
  -- Content
  title TEXT NOT NULL,
  author VARCHAR(200),
  language VARCHAR(5) DEFAULT 'de',
  
  content TEXT,
  abstract TEXT,
  
  -- Rights management
  rights_status VARCHAR(20) NOT NULL DEFAULT 'verified',
  source_id INT REFERENCES content_sources(id),
  publication_owns_rights BOOLEAN DEFAULT FALSE,
  digitization_rights_cleared BOOLEAN DEFAULT FALSE,
  
  why_uncertain TEXT,
  usage_restriction VARCHAR(50),
  
  -- Full-text search
  search_vector TSVECTOR GENERATED ALWAYS AS (
    to_tsvector('german', title || ' ' || COALESCE(author, '') || ' ' || COALESCE(abstract, ''))
  ) STORED,
  
  -- Audit
  digitized_by VARCHAR(100),
  digitized_date DATE,
  created_at TIMESTAMP NOT NULL DEFAULT NOW(),
  created_by INT,
  updated_at TIMESTAMP,
  deleted_at TIMESTAMP,
  
  CONSTRAINT chk_article_rights CHECK (
    (rights_status = 'uncertain' AND content IS NULL) OR
    (rights_status = 'verified')
  )
);

CREATE INDEX idx_articles_pub ON articles(publication_code, issue_number);
CREATE INDEX idx_articles_year ON articles(year);
CREATE INDEX idx_articles_author ON articles(author);
CREATE INDEX idx_articles_status ON articles(rights_status);
CREATE INDEX idx_articles_fts ON articles USING GIN(search_vector);

COMMENT ON TABLE articles IS 'Magazine articles - Photo Antiquaria, Club Daguerre aktuell, etc.';

-- ==========================================
-- CAMERA-ARTICLE LINKS (Many-to-Many with Multi-Level)
-- ==========================================
CREATE TABLE camera_articles (
  id SERIAL PRIMARY KEY,
  article_id INT NOT NULL REFERENCES articles(id) ON DELETE CASCADE,
  
  -- FLEXIBLE MULTI-LEVEL LINKING (only ONE should be set)
  manufacturer_id INT REFERENCES manufacturers(id),
  camera_model_id INT REFERENCES camera_models(id),
  housing_variant_id INT REFERENCES housing_variants(id),
  combo_id INT REFERENCES lens_shutter_combos(id),
  
  relevance VARCHAR(20),
  
  created_at TIMESTAMP NOT NULL DEFAULT NOW(),
  created_by INT,
  
  -- Exactly ONE link must be set
  CONSTRAINT chk_article_link CHECK (
    (manufacturer_id IS NOT NULL AND camera_model_id IS NULL AND housing_variant_id IS NULL AND combo_id IS NULL) OR
    (manufacturer_id IS NULL AND camera_model_id IS NOT NULL AND housing_variant_id IS NULL AND combo_id IS NULL) OR
    (manufacturer_id IS NULL AND camera_model_id IS NULL AND housing_variant_id IS NOT NULL AND combo_id IS NULL) OR
    (manufacturer_id IS NULL AND camera_model_id IS NULL AND housing_variant_id IS NULL AND combo_id IS NOT NULL)
  ),
  CONSTRAINT chk_relevance CHECK (relevance IN ('primary', 'mentioned', 'comparison')),
  UNIQUE(article_id, manufacturer_id, camera_model_id, housing_variant_id, combo_id)
);

CREATE INDEX idx_ca_article ON camera_articles(article_id);
CREATE INDEX idx_ca_manufacturer ON camera_articles(manufacturer_id) WHERE manufacturer_id IS NOT NULL;
CREATE INDEX idx_ca_model ON camera_articles(camera_model_id) WHERE camera_model_id IS NOT NULL;
CREATE INDEX idx_ca_variant ON camera_articles(housing_variant_id) WHERE housing_variant_id IS NOT NULL;
CREATE INDEX idx_ca_combo ON camera_articles(combo_id) WHERE combo_id IS NOT NULL;

COMMENT ON TABLE camera_articles IS 'Links articles to cameras at appropriate hierarchy level';

-- ==========================================
-- ANNOTATIONS (User Contributions)
-- ==========================================
CREATE TABLE annotations (
  id SERIAL PRIMARY KEY,
  combo_id INT NOT NULL REFERENCES lens_shutter_combos(id) ON DELETE CASCADE,
  annotation_type VARCHAR(50) NOT NULL,
  
  -- Bilingual content
  content_de TEXT,
  content_en TEXT,
  source_language VARCHAR(5),
  
  -- Attribution
  contributed_by INT,
  contribution_date TIMESTAMP NOT NULL DEFAULT NOW(),
  
  -- Moderation
  approved BOOLEAN DEFAULT FALSE,
  approved_by INT,
  approved_date TIMESTAMP,
  
  updated_at TIMESTAMP,
  deleted_at TIMESTAMP,
  
  CONSTRAINT chk_annotation_type CHECK (annotation_type IN ('historical_note', 'anecdote', 'provenance', 'usage_note', 'technical_note'))
);

CREATE INDEX idx_annotations_combo ON annotations(combo_id);
CREATE INDEX idx_annotations_type ON annotations(annotation_type);
CREATE INDEX idx_annotations_approved ON annotations(approved);

COMMENT ON TABLE annotations IS 'User-contributed notes and information';