-- 001_Initial.sql
-- Creates read model tables for Books API
-- NOTE: Column names use snake_case (PostgreSQL convention)
-- Custom ReadModelSqlGenerator converts C# PascalCase to snake_case

-- Company read models
CREATE TABLE IF NOT EXISTS company_read_models (
    -- EventFlow standard columns
    aggregate_id VARCHAR(255) PRIMARY KEY,
    create_time TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_time TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    last_aggregate_sequence_number INT NOT NULL DEFAULT 1,

    -- Business columns (snake_case)
    name VARCHAR(255) NOT NULL,
    cvr VARCHAR(8),
    address VARCHAR(500),
    postal_code VARCHAR(10),
    city VARCHAR(100),
    country VARCHAR(2) NOT NULL DEFAULT 'DK',
    fiscal_year_start_month SMALLINT NOT NULL DEFAULT 1,
    currency VARCHAR(3) NOT NULL DEFAULT 'DKK',
    vat_registered BOOLEAN NOT NULL DEFAULT FALSE,
    vat_period_frequency VARCHAR(20)
);

CREATE UNIQUE INDEX IF NOT EXISTS idx_company_cvr ON company_read_models(cvr) WHERE cvr IS NOT NULL;

-- Fiscal year read models
CREATE TABLE IF NOT EXISTS fiscal_year_read_models (
    aggregate_id VARCHAR(255) PRIMARY KEY,
    create_time TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_time TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    last_aggregate_sequence_number INT NOT NULL DEFAULT 1,

    company_id VARCHAR(255) NOT NULL,
    name VARCHAR(50) NOT NULL,
    start_date DATE NOT NULL,
    end_date DATE NOT NULL,
    status VARCHAR(20) NOT NULL DEFAULT 'open',
    opening_balance_posted BOOLEAN NOT NULL DEFAULT FALSE,
    closing_date TIMESTAMPTZ,
    closed_by VARCHAR(255),

    CONSTRAINT fk_fiscal_year_company
        FOREIGN KEY (company_id) REFERENCES company_read_models(aggregate_id) ON DELETE CASCADE,
    CONSTRAINT chk_fiscal_year_status
        CHECK (status IN ('open', 'closed', 'locked'))
);

CREATE INDEX IF NOT EXISTS idx_fiscal_year_company ON fiscal_year_read_models(company_id);
CREATE INDEX IF NOT EXISTS idx_fiscal_year_dates ON fiscal_year_read_models(start_date, end_date);

-- Accounting period read models
CREATE TABLE IF NOT EXISTS accounting_period_read_models (
    aggregate_id VARCHAR(255) PRIMARY KEY,
    create_time TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_time TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    last_aggregate_sequence_number INT NOT NULL DEFAULT 1,

    fiscal_year_id VARCHAR(255) NOT NULL,
    company_id VARCHAR(255) NOT NULL,
    name VARCHAR(50) NOT NULL,
    period_number SMALLINT NOT NULL,
    start_date DATE NOT NULL,
    end_date DATE NOT NULL,
    status VARCHAR(20) NOT NULL DEFAULT 'future',
    closed_at TIMESTAMPTZ,
    closed_by VARCHAR(255),
    reopened_at TIMESTAMPTZ,
    reopened_by VARCHAR(255),
    locked_at TIMESTAMPTZ,
    locked_by VARCHAR(255),

    CONSTRAINT fk_period_fiscal_year
        FOREIGN KEY (fiscal_year_id) REFERENCES fiscal_year_read_models(aggregate_id) ON DELETE CASCADE,
    CONSTRAINT chk_period_status
        CHECK (status IN ('future', 'open', 'closed', 'locked'))
);

CREATE INDEX IF NOT EXISTS idx_period_fiscal_year ON accounting_period_read_models(fiscal_year_id);
CREATE INDEX IF NOT EXISTS idx_period_company ON accounting_period_read_models(company_id);

-- Account read models (chart of accounts)
CREATE TABLE IF NOT EXISTS account_read_models (
    aggregate_id VARCHAR(255) PRIMARY KEY,
    create_time TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_time TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    last_aggregate_sequence_number INT NOT NULL DEFAULT 1,

    company_id VARCHAR(255) NOT NULL,
    account_number VARCHAR(10) NOT NULL,
    name VARCHAR(255) NOT NULL,
    account_type VARCHAR(20) NOT NULL,
    parent_id VARCHAR(255),
    description TEXT,
    vat_code_id VARCHAR(255),
    is_active BOOLEAN NOT NULL DEFAULT TRUE,
    is_system_account BOOLEAN NOT NULL DEFAULT FALSE,

    CONSTRAINT fk_account_company
        FOREIGN KEY (company_id) REFERENCES company_read_models(aggregate_id) ON DELETE CASCADE,
    CONSTRAINT chk_account_type
        CHECK (account_type IN ('asset', 'liability', 'equity', 'revenue', 'cogs', 'expense', 'personnel', 'financial', 'extraordinary'))
);

CREATE UNIQUE INDEX IF NOT EXISTS idx_account_number
    ON account_read_models(company_id, account_number);
CREATE INDEX IF NOT EXISTS idx_account_company ON account_read_models(company_id);
CREATE INDEX IF NOT EXISTS idx_account_type ON account_read_models(account_type);