-- Create enums for states (using German names), countries (using ISO codes for i18n), and language levels
CREATE TYPE app.german_state AS ENUM (
    'Baden-Württemberg',
    'Bayern',
    'Berlin',
    'Brandenburg',
    'Bremen',
    'Hamburg',
    'Hessen',
    'Mecklenburg-Vorpommern',
    'Niedersachsen',
    'Nordrhein-Westfalen',
    'Rheinland-Pfalz',
    'Saarland',
    'Sachsen',
    'Sachsen-Anhalt',
    'Schleswig-Holstein',
    'Thüringen'
);

CREATE TYPE app.education_country AS ENUM (
    'AL', -- Albania
    'BA', -- Bosnia and Herzegovina
    'IN', -- India
    'MX', -- Mexico
    'PH', -- Philippines
    'SY', -- Syria
    'TN', -- Tunisia
    'TR', -- Turkey
    'UA', -- Ukraine
    'VN'  -- Vietnam
);

CREATE TYPE app.language_level AS ENUM (
    'A_ONE',
    'A_TWO',
    'B_ONE',
    'B_TWO',
    'C_ONE',
    'C_TWO'
);

CREATE TYPE app.candidate_document_type AS ENUM (
    'education', 
    'transcript', 
    'license', 
    'language', 
    'work_experience'
);

CREATE TABLE app.candidate (
    candidate_id UUID PRIMARY KEY DEFAULT gen_random_uuid(),

    email VARCHAR NOT NULL,
    name VARCHAR NOT NULL,

    -- Basic info
    state_work_preference app.german_state[],
    open_to_work BOOLEAN,
    living_in_germany BOOLEAN,
    eu_passport BOOLEAN,
    country_education app.education_country,
    
    -- License info
    license_provided BOOLEAN,
    
    -- Language info
    language_certificate_provided BOOLEAN,
    language_self_assessment_level app.language_level,
    
    submitted_at TIMESTAMPTZ,
    created_at TIMESTAMPTZ DEFAULT CURRENT_TIMESTAMP,
    last_updated_at TIMESTAMPTZ DEFAULT CURRENT_TIMESTAMP
);

CREATE TABLE app.candidate_document (
    document_id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    candidate_id UUID NOT NULL REFERENCES app.candidate,
    category app.candidate_document_type NOT NULL,
    title VARCHAR,
    note VARCHAR,
    file_path VARCHAR NOT NULL,
    file_name VARCHAR NOT NULL,
    file_size INTEGER,
    mime_type VARCHAR,
    uploaded BOOLEAN DEFAULT FALSE,
    
    created_at TIMESTAMPTZ DEFAULT CURRENT_TIMESTAMP,
    last_updated_at TIMESTAMPTZ DEFAULT CURRENT_TIMESTAMP
);

-- Add triggers for timestamp updates
CREATE TRIGGER update_candidate_timestamp 
    BEFORE UPDATE ON app.candidate
    FOR EACH ROW EXECUTE PROCEDURE app.update_lastupdated_timestamp();

CREATE TRIGGER update_candidate_document_timestamp 
    BEFORE UPDATE ON app.candidate_document
    FOR EACH ROW EXECUTE PROCEDURE app.update_lastupdated_timestamp();