-- Run this migration after the original schema.sql has already been created.
-- PostgreSQL 12+; safe to run once on the existing database.

BEGIN;

CREATE TABLE IF NOT EXISTS app_users (
    id                  BIGINT GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
    email               VARCHAR(320) NOT NULL,
    display_name        VARCHAR(120),
    password_hash       TEXT,
    role                VARCHAR(20) NOT NULL DEFAULT 'user'
                        CHECK (role IN ('user', 'admin')),
    is_active           BOOLEAN NOT NULL DEFAULT TRUE,
    email_verified_at   TIMESTAMPTZ,
    last_login_at       TIMESTAMPTZ,
    created_at          TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at          TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    CONSTRAINT uq_app_users_email UNIQUE (email)
);

CREATE TABLE IF NOT EXISTS newsletter_recipients (
    id                  BIGINT GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
    user_id             BIGINT REFERENCES app_users(id) ON DELETE SET NULL,
    email               VARCHAR(320) NOT NULL,
    display_name        VARCHAR(120),
    enabled             BOOLEAN NOT NULL DEFAULT TRUE,
    send_time           TIME NOT NULL DEFAULT TIME '07:30',
    timezone            VARCHAR(64) NOT NULL DEFAULT 'Asia/Shanghai',
    send_all_modules    BOOLEAN NOT NULL DEFAULT FALSE,
    created_at          TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at          TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    CONSTRAINT uq_newsletter_recipients_email UNIQUE (email)
);

CREATE TABLE IF NOT EXISTS newsletter_modules (
    module_key          VARCHAR(40) PRIMARY KEY,
    module_name         VARCHAR(120) NOT NULL,
    description         TEXT,
    enabled             BOOLEAN NOT NULL DEFAULT TRUE,
    sort_order          INTEGER NOT NULL DEFAULT 0,
    created_at          TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

INSERT INTO newsletter_modules (module_key, module_name, description, sort_order)
VALUES
    ('general', '综合热点', '国内外综合资讯', 10),
    ('ai_agent', 'AI 与 Agent', '大模型、AI 应用和 Agent', 20),
    ('agri_hardware', '农业硬件', '传感器、无人机、机器人和农机', 30),
    ('agri_solutions', '农业方案落地', '智慧农场、温室、灌溉和数字化方案', 40),
    ('agri_services', '农业服务', '农业 SaaS、农技、托管、供应链和运维服务', 50),
    ('policy_market', '政策与市场', '政策、补贴、投资、招标和市场动态', 60),
    ('domestic', '国内资讯', '国内来源或国内市场相关资讯', 70),
    ('international', '国际资讯', '国际来源或国际市场相关资讯', 80)
ON CONFLICT (module_key) DO NOTHING;

CREATE TABLE IF NOT EXISTS recipient_modules (
    recipient_id        BIGINT NOT NULL REFERENCES newsletter_recipients(id) ON DELETE CASCADE,
    module_key          VARCHAR(40) NOT NULL REFERENCES newsletter_modules(module_key) ON DELETE RESTRICT,
    created_at          TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    PRIMARY KEY (recipient_id, module_key)
);

ALTER TABLE email_deliveries
    ADD COLUMN IF NOT EXISTS recipient_id BIGINT,
    ADD COLUMN IF NOT EXISTS modules TEXT[] NOT NULL DEFAULT '{}';

DO $$
BEGIN
    IF NOT EXISTS (
        SELECT 1 FROM pg_constraint WHERE conname = 'fk_email_deliveries_recipient'
    ) THEN
        ALTER TABLE email_deliveries
            ADD CONSTRAINT fk_email_deliveries_recipient
            FOREIGN KEY (recipient_id) REFERENCES newsletter_recipients(id) ON DELETE SET NULL;
    END IF;
END $$;

CREATE INDEX IF NOT EXISTS idx_newsletter_recipients_user
    ON newsletter_recipients (user_id);
CREATE INDEX IF NOT EXISTS idx_newsletter_recipients_enabled
    ON newsletter_recipients (enabled, send_time);
CREATE INDEX IF NOT EXISTS idx_recipient_modules_module
    ON recipient_modules (module_key);

COMMIT;