-- Hardware Asset Management Module
-- Created: 2026-01-30
-- Description: Complete hardware tracking with ownership, location, and attachment history

-- ============================================================================
-- Table 1: hardware_assets
-- ============================================================================
CREATE TABLE IF NOT EXISTS hardware_assets (
    id SERIAL PRIMARY KEY,
    asset_type VARCHAR(50) NOT NULL CHECK (asset_type IN ('pc', 'laptop', 'printer', 'skærm', 'telefon', 'server', 'netværk', 'andet')),
    brand VARCHAR(100),
    model VARCHAR(100),
    serial_number VARCHAR(100),
    customer_asset_id VARCHAR(50),  -- Customer's inventory number
    internal_asset_id VARCHAR(50),  -- BMC internal ID
    notes TEXT,
    
    -- Current state (for quick queries)
    current_owner_type VARCHAR(50) CHECK (current_owner_type IN ('customer', 'bmc', 'third_party')),
    current_owner_customer_id INT,  -- if owner_type = customer
    current_location_id INT,
    
    -- Status
    status VARCHAR(50) DEFAULT 'active' CHECK (status IN ('active', 'faulty_reported', 'in_repair', 'replaced', 'retired', 'unsupported')),
    status_reason TEXT,
    warranty_until DATE,
    end_of_life DATE,
    
    -- Follow-up
    follow_up_date DATE,
    follow_up_owner_user_id INT,
    
    -- Standard fields
    created_at TIMESTAMP DEFAULT NOW(),
    updated_at TIMESTAMP DEFAULT NOW(),
    deleted_at TIMESTAMP
);

CREATE INDEX IF NOT EXISTS idx_hardware_serial ON hardware_assets(serial_number);
CREATE INDEX IF NOT EXISTS idx_hardware_customer ON hardware_assets(current_owner_customer_id);
CREATE INDEX IF NOT EXISTS idx_hardware_status ON hardware_assets(status) WHERE deleted_at IS NULL;

-- ============================================================================
-- Table 2: hardware_ownership_history
-- ============================================================================
CREATE TABLE IF NOT EXISTS hardware_ownership_history (
    id SERIAL PRIMARY KEY,
    hardware_id INT NOT NULL REFERENCES hardware_assets(id),
    owner_type VARCHAR(50) NOT NULL CHECK (owner_type IN ('customer', 'bmc', 'third_party')),
    owner_customer_id INT,  -- if owner_type = customer
    start_date DATE NOT NULL,
    end_date DATE,  -- NULL = active ownership
    notes TEXT,
    created_at TIMESTAMP DEFAULT NOW(),
    deleted_at TIMESTAMP
);

CREATE INDEX IF NOT EXISTS idx_ownership_hardware ON hardware_ownership_history(hardware_id);
CREATE INDEX IF NOT EXISTS idx_ownership_active ON hardware_ownership_history(hardware_id, end_date) WHERE end_date IS NULL AND deleted_at IS NULL;

-- ============================================================================
-- Table 3: hardware_location_history
-- ============================================================================
CREATE TABLE IF NOT EXISTS hardware_location_history (
    id SERIAL PRIMARY KEY,
    hardware_id INT NOT NULL REFERENCES hardware_assets(id),
    location_id INT,  -- Reference to locations table (if exists)
    location_name VARCHAR(200),  -- Free text if no location_id
    start_date DATE NOT NULL,
    end_date DATE,  -- NULL = current location
    notes TEXT,
    created_at TIMESTAMP DEFAULT NOW(),
    deleted_at TIMESTAMP
);

CREATE INDEX IF NOT EXISTS idx_location_hardware ON hardware_location_history(hardware_id);
CREATE INDEX IF NOT EXISTS idx_location_active ON hardware_location_history(hardware_id, end_date) WHERE end_date IS NULL AND deleted_at IS NULL;

-- ============================================================================
-- Table 4: hardware_attachments
-- ============================================================================
CREATE TABLE IF NOT EXISTS hardware_attachments (
    id SERIAL PRIMARY KEY,
    hardware_id INT NOT NULL REFERENCES hardware_assets(id),
    file_type VARCHAR(50),  -- 'image', 'receipt', 'contract', 'manual', 'other'
    file_name VARCHAR(255) NOT NULL,
    storage_ref TEXT NOT NULL,  -- Path or cloud storage reference
    file_size_bytes BIGINT,
    mime_type VARCHAR(100),
    description TEXT,
    uploaded_by_user_id INT,
    uploaded_at TIMESTAMP DEFAULT NOW(),
    deleted_at TIMESTAMP
);

CREATE INDEX IF NOT EXISTS idx_attachments_hardware ON hardware_attachments(hardware_id);

-- ============================================================================
-- Table 5: hardware_case_relations
-- ============================================================================
CREATE TABLE IF NOT EXISTS hardware_case_relations (
    id SERIAL PRIMARY KEY,
    hardware_id INT NOT NULL REFERENCES hardware_assets(id),
    case_id INT NOT NULL,  -- References sag_sager(id)
    relation_type VARCHAR(50) DEFAULT 'related',  -- 'repair', 'installation', 'support', 'related'
    created_at TIMESTAMP DEFAULT NOW(),
    deleted_at TIMESTAMP
);

CREATE INDEX IF NOT EXISTS idx_hardware_cases ON hardware_case_relations(hardware_id);
CREATE INDEX IF NOT EXISTS idx_case_hardware ON hardware_case_relations(case_id);

-- ============================================================================
-- Table 6: hardware_tags
-- ============================================================================
CREATE TABLE IF NOT EXISTS hardware_tags (
    id SERIAL PRIMARY KEY,
    hardware_id INT NOT NULL REFERENCES hardware_assets(id),
    tag_name VARCHAR(100) NOT NULL,
    tag_type VARCHAR(50) DEFAULT 'manual' CHECK (tag_type IN ('manual', 'system', 'ai_generated')),
    created_at TIMESTAMP DEFAULT NOW(),
    deleted_at TIMESTAMP
);

CREATE INDEX IF NOT EXISTS idx_hardware_tags ON hardware_tags(hardware_id);
CREATE INDEX IF NOT EXISTS idx_tag_name ON hardware_tags(tag_name) WHERE deleted_at IS NULL;

-- ============================================================================
-- Success message
-- ============================================================================
DO $$
BEGIN
    RAISE NOTICE '✅ Hardware module tables created successfully';
END $$;