drop schema "public"
show search_path;

set schema "ptmain";

CREATE SCHEMA if not exists ptmain;
GRANT USAGE, CREATE ON SCHEMA ptmain TO sathumper;
GRANT ALL PRIVILEGES ON ALL SEQUENCES IN SCHEMA ptmain TO sathumper;
GRANT ALL PRIVILEGES ON ALL TABLES IN SCHEMA ptmain TO sathumper;

ALTER DEFAULT PRIVILEGES IN SCHEMA ptmain
GRANT ALL PRIVILEGES ON TABLES TO sathumper;


-- Create schema if not exists

insert into 
-- Create main configuration table
CREATE TABLE app_configuration (
    id BIGSERIAL PRIMARY KEY,
    key VARCHAR(255) NOT NULL,
    value TEXT NOT NULL,
    label VARCHAR(255),
    content_type VARCHAR(255) DEFAULT 'text/plain',
    valid_from TIMESTAMPTZ,
    expires_at TIMESTAMPTZ,
    created_at TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP,
    modified_at TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP,
    etag UUID DEFAULT gen_random_uuid(),
    CONSTRAINT app_configuration_key_unique UNIQUE (key, valid_from)
);

-- Create history table
CREATE TABLE app_configuration_history (
    history_id BIGSERIAL PRIMARY KEY,
    operation CHAR(1) NOT NULL, -- I = Insert, U = Update, D = Delete
    changed_at TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP,
    changed_by TEXT NOT NULL DEFAULT CURRENT_USER,
    -- Original columns
    id BIGINT NOT NULL,
    key VARCHAR(255) NOT NULL,
    value TEXT NOT NULL,
    label VARCHAR(255),
    content_type VARCHAR(255),
    valid_from TIMESTAMPTZ,
    expires_at TIMESTAMPTZ,
    created_at TIMESTAMPTZ NOT NULL,
    modified_at TIMESTAMPTZ NOT NULL,
    etag UUID
);



-- Create function for updating modified_at
CREATE OR REPLACE FUNCTION update_modified_at()
RETURNS TRIGGER AS $$
BEGIN
    NEW.modified_at = CURRENT_TIMESTAMP;
    RETURN NEW;
END;
$$ LANGUAGE plpgsql;

-- Create history tracking function
CREATE OR REPLACE FUNCTION track_configuration_history()
RETURNS TRIGGER AS $$
BEGIN
    -- Indsæt historikpost baseret på operationstypen
    IF TG_OP = 'INSERT' THEN
        INSERT INTO app_configuration_history(
            operation,
            id, key, value, label, content_type, valid_from, expires_at, 
            created_at, modified_at, etag
        )
        VALUES (
            'I',
            NEW.id, NEW.key, NEW.value, NEW.label, NEW.content_type, NEW.valid_from, 
            NEW.expires_at, NEW.created_at, NEW.modified_at, NEW.etag
        );
    ELSIF TG_OP = 'UPDATE' OR TG_OP = 'DELETE' THEN
        -- Brug OLD for både UPDATE og DELETE
        INSERT INTO app_configuration_history(
            operation,
            id, key, value, label, content_type, valid_from, expires_at, 
            created_at, modified_at, etag
        )
        VALUES (
            CASE 
                WHEN TG_OP = 'UPDATE' THEN 'U'
                WHEN TG_OP = 'DELETE' THEN 'D'
            END,
            OLD.id, OLD.key, OLD.value, OLD.label, OLD.content_type, OLD.valid_from, 
            OLD.expires_at, OLD.created_at, OLD.modified_at, OLD.etag
        );
    END IF;

    -- Returner NULL for AFTER-trigger
    RETURN NULL;
EXCEPTION
    WHEN others THEN
        -- Log fejl og rejs undtagelse
        RAISE EXCEPTION 'Fejl i track_configuration_history: %', SQLERRM;
END;
$$ LANGUAGE plpgsql;

-- Create triggers
CREATE TRIGGER trg_app_configuration_modified_at
    BEFORE UPDATE ON app_configuration
    FOR EACH ROW
    EXECUTE FUNCTION update_modified_at();

CREATE TRIGGER trg_app_configuration_history
    AFTER INSERT OR UPDATE OR DELETE ON app_configuration
    FOR EACH ROW
    EXECUTE FUNCTION track_configuration_history();

CREATE TRIGGER trg_app_configuration_notify
    AFTER INSERT OR UPDATE ON app_configuration
    FOR EACH ROW
    EXECUTE FUNCTION notify_config_change();

-- Comments
COMMENT ON TABLE app_configuration IS 'Application configuration with temporal validity';
COMMENT ON TABLE app_configuration_history IS 'Historical changes to application configuration';
COMMENT ON COLUMN app_configuration_history.operation IS 'Type of operation: I=Insert, U=Update, D=Delete';
COMMENT ON COLUMN app_configuration_history.changed_at IS 'When the change occurred';
COMMENT ON COLUMN app_configuration_history.changed_by IS 'User who made the change';


```sql
-- Email templates configuration
INSERT INTO app_configuration (key, value, label, content_type, valid_from, expires_at) VALUES
('Email:Templates:Welcome', 
 '{"subject":"Velkommen til vores platform","template":"welcome-dk.html","sender":"velkommen@firma.dk"}',
 'Email Templates',
 'application/json',
 '2024-01-01T00:00:00Z',
 NULL);
select * from app_configuration_history 
update app_configuration 
set label = 'test'

INSERT INTO app_configuration (key, value, label, content_type, valid_from, expires_at) VALUES
('Email:Templates:Password', 
 '{"subject":"Nulstil dit kodeord","template":"reset-password-dk.html","sender":"support@firma.dk"}',
 'Email Templates',
 'application/json',
 '2024-01-01T00:00:00Z',
 NULL);

-- API configuration
INSERT INTO app_configuration (key, value, label, content_type, valid_from, expires_at) VALUES
('Api:Endpoints:BaseUrl', 
 '{"production":"https://api.firma.dk","staging":"https://staging-api.firma.dk"}',
 'API Settings',
 'application/json',
 '2024-01-01T00:00:00Z',
 NULL);

-- Feature flags
INSERT INTO app_configuration (key, value, label, content_type, valid_from, expires_at) VALUES
('Features:NewUI', 
 '{"enabled":false,"rolloutPercentage":0,"description":"New React based UI"}',
 'Feature Flags',
 'application/json',
 '2024-02-01T00:00:00Z',
 '2024-12-31T23:59:59Z');

-- System settings  
INSERT INTO app_configuration (key, value, label, content_type, valid_from, expires_at) VALUES
('System:Cache', 
 '{"timeoutMinutes":15,"maxItems":1000,"distributed":true}',
 'System Settings',
 'application/json',
 '2024-01-01T00:00:00Z',
 NULL);
```