-- IMFestival SMS Dashboard — database schema
-- Runs automatically on first MariaDB container start.

CREATE DATABASE IF NOT EXISTS imf_sms CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
USE imf_sms;

-- ─── Core attendee data ───────────────────────────────────────────────────────

CREATE TABLE IF NOT EXISTS attendees (
    id             INT UNSIGNED    NOT NULL AUTO_INCREMENT,
    first_name     VARCHAR(100)    NOT NULL,
    last_name      VARCHAR(100)    NOT NULL,
    email          VARCHAR(255)    DEFAULT NULL,
    mobile_number  VARCHAR(30)     NOT NULL,
    created_at     TIMESTAMP       NOT NULL DEFAULT CURRENT_TIMESTAMP,
    PRIMARY KEY (id),
    UNIQUE KEY uq_mobile (mobile_number)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

CREATE TABLE IF NOT EXISTS workshop_sessions (
    id              INT UNSIGNED    NOT NULL AUTO_INCREMENT,
    workshop_name   VARCHAR(255)    NOT NULL,
    workshop_time   DATETIME        DEFAULT NULL,
    PRIMARY KEY (id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

CREATE TABLE IF NOT EXISTS registrations (
    id                   INT UNSIGNED    NOT NULL AUTO_INCREMENT,
    attendee_id          INT UNSIGNED    NOT NULL,
    workshop_session_id  INT UNSIGNED    NOT NULL,
    PRIMARY KEY (id),
    FOREIGN KEY (attendee_id)         REFERENCES attendees(id)         ON DELETE CASCADE,
    FOREIGN KEY (workshop_session_id) REFERENCES workshop_sessions(id) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- ─── SMS templates ────────────────────────────────────────────────────────────

CREATE TABLE IF NOT EXISTS sms_templates (
    id          INT UNSIGNED    NOT NULL AUTO_INCREMENT,
    name        VARCHAR(255)    NOT NULL,
    body        VARCHAR(160)    NOT NULL,
    created_at  TIMESTAMP       NOT NULL DEFAULT CURRENT_TIMESTAMP,
    updated_at  TIMESTAMP       NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    PRIMARY KEY (id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- ─── Scheduled send rules ─────────────────────────────────────────────────────

CREATE TABLE IF NOT EXISTS scheduled_rules (
    id                  INT UNSIGNED                            NOT NULL AUTO_INCREMENT,
    template_id         INT UNSIGNED                            NOT NULL,
    mode                ENUM('relative','specific')             NOT NULL,
    offset_value        INT                                     DEFAULT NULL,   -- used when mode=relative
    offset_unit         ENUM('minutes','hours','days')          DEFAULT NULL,   -- used when mode=relative
    specific_datetime   DATETIME                                DEFAULT NULL,   -- used when mode=specific
    created_at          TIMESTAMP                               NOT NULL DEFAULT CURRENT_TIMESTAMP,
    PRIMARY KEY (id),
    FOREIGN KEY (template_id) REFERENCES sms_templates(id) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- ─── Send jobs ────────────────────────────────────────────────────────────────

CREATE TABLE IF NOT EXISTS send_jobs (
    id                   INT UNSIGNED                                        NOT NULL AUTO_INCREMENT,
    template_id          INT UNSIGNED                                        DEFAULT NULL,
    custom_body          VARCHAR(160)                                        DEFAULT NULL,
    recipient_scope      ENUM('all','workshop')                              NOT NULL DEFAULT 'all',
    workshop_session_id  INT UNSIGNED                                        DEFAULT NULL,
    scheduled_rule_id    INT UNSIGNED                                        DEFAULT NULL,
    status               ENUM('pending','sending','completed','failed')      NOT NULL DEFAULT 'pending',
    created_at           TIMESTAMP                                           NOT NULL DEFAULT CURRENT_TIMESTAMP,
    sent_at              TIMESTAMP                                           DEFAULT NULL,
    PRIMARY KEY (id),
    FOREIGN KEY (template_id)         REFERENCES sms_templates(id)      ON DELETE SET NULL,
    FOREIGN KEY (workshop_session_id) REFERENCES workshop_sessions(id)   ON DELETE SET NULL,
    FOREIGN KEY (scheduled_rule_id)   REFERENCES scheduled_rules(id)     ON DELETE SET NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- ─── Delivery log ─────────────────────────────────────────────────────────────

CREATE TABLE IF NOT EXISTS delivery_log (
    id             INT UNSIGNED                        NOT NULL AUTO_INCREMENT,
    send_job_id    INT UNSIGNED                        NOT NULL,
    attendee_id    INT UNSIGNED                        DEFAULT NULL,
    mobile_number  VARCHAR(30)                         NOT NULL,
    status         ENUM('sent','delivered','failed')   NOT NULL DEFAULT 'sent',
    sent_at        TIMESTAMP                           NOT NULL DEFAULT CURRENT_TIMESTAMP,
    delivered_at   TIMESTAMP                           DEFAULT NULL,
    error_message  TEXT                                DEFAULT NULL,
    PRIMARY KEY (id),
    FOREIGN KEY (send_job_id)  REFERENCES send_jobs(id)  ON DELETE CASCADE,
    FOREIGN KEY (attendee_id)  REFERENCES attendees(id)  ON DELETE SET NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- ─── System settings ──────────────────────────────────────────────────────────

CREATE TABLE IF NOT EXISTS `system` (
    id             INT UNSIGNED    NOT NULL AUTO_INCREMENT,
    setting_name   VARCHAR(100)    NOT NULL,
    setting_value  TEXT            DEFAULT NULL,
    PRIMARY KEY (id),
    UNIQUE KEY uq_setting_name (setting_name)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- Seed default settings
INSERT IGNORE INTO `system` (setting_name, setting_value) VALUES
    ('clickatell_api_key',     NULL),
    ('clickatell_cost_per_sms', '0.04849'),
    ('default_sender_id',      'IMFestival'),
    ('sandbox_mode',           '0');

-- ─── Schema migrations (idempotent) ─────────────────────────────────────────
-- Safe to run on existing databases; ADD COLUMN IF NOT EXISTS is a no-op when
-- the column already exists.
ALTER TABLE delivery_log ADD COLUMN IF NOT EXISTS is_sandbox TINYINT(1) NOT NULL DEFAULT 0;