-- Forum Modernization Migration
-- Author: Claude Code
-- Date: 2026-01-31
-- Description: Adds edit tracking, soft delete, reactions, subscriptions, reports, and edit history

-- ============================================================
-- PHASE 1: Add new columns to forum_topics
-- ============================================================

-- Edit tracking
ALTER TABLE forum_topics ADD COLUMN IF NOT EXISTS edited_at TIMESTAMP;
ALTER TABLE forum_topics ADD COLUMN IF NOT EXISTS edited_by INTEGER REFERENCES users(id);
ALTER TABLE forum_topics ADD COLUMN IF NOT EXISTS edit_count INTEGER DEFAULT 0;

-- Soft delete
ALTER TABLE forum_topics ADD COLUMN IF NOT EXISTS is_deleted BOOLEAN DEFAULT FALSE;
ALTER TABLE forum_topics ADD COLUMN IF NOT EXISTS deleted_at TIMESTAMP;
ALTER TABLE forum_topics ADD COLUMN IF NOT EXISTS deleted_by INTEGER REFERENCES users(id);

-- Reactions (JSONB)
ALTER TABLE forum_topics ADD COLUMN IF NOT EXISTS reactions JSONB DEFAULT '{}';

-- ============================================================
-- PHASE 2: Add new columns to forum_replies
-- ============================================================

-- Edit tracking
ALTER TABLE forum_replies ADD COLUMN IF NOT EXISTS edited_at TIMESTAMP;
ALTER TABLE forum_replies ADD COLUMN IF NOT EXISTS edited_by INTEGER REFERENCES users(id);
ALTER TABLE forum_replies ADD COLUMN IF NOT EXISTS edit_count INTEGER DEFAULT 0;

-- Soft delete
ALTER TABLE forum_replies ADD COLUMN IF NOT EXISTS is_deleted BOOLEAN DEFAULT FALSE;
ALTER TABLE forum_replies ADD COLUMN IF NOT EXISTS deleted_at TIMESTAMP;
ALTER TABLE forum_replies ADD COLUMN IF NOT EXISTS deleted_by INTEGER REFERENCES users(id);

-- Reactions (JSONB)
ALTER TABLE forum_replies ADD COLUMN IF NOT EXISTS reactions JSONB DEFAULT '{}';

-- Solution marking
ALTER TABLE forum_replies ADD COLUMN IF NOT EXISTS is_solution BOOLEAN DEFAULT FALSE;
ALTER TABLE forum_replies ADD COLUMN IF NOT EXISTS marked_as_solution_by INTEGER REFERENCES users(id);
ALTER TABLE forum_replies ADD COLUMN IF NOT EXISTS marked_as_solution_at TIMESTAMP;

-- ============================================================
-- PHASE 3: Create forum_topic_subscriptions table
-- ============================================================

CREATE TABLE IF NOT EXISTS forum_topic_subscriptions (
    id SERIAL PRIMARY KEY,
    user_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    topic_id INTEGER NOT NULL REFERENCES forum_topics(id) ON DELETE CASCADE,
    notify_email BOOLEAN DEFAULT TRUE,
    notify_app BOOLEAN DEFAULT TRUE,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    CONSTRAINT uq_forum_subscription_user_topic UNIQUE (user_id, topic_id)
);

-- Indexes for subscriptions
CREATE INDEX IF NOT EXISTS idx_forum_subscriptions_user ON forum_topic_subscriptions(user_id);
CREATE INDEX IF NOT EXISTS idx_forum_subscriptions_topic ON forum_topic_subscriptions(topic_id);

-- ============================================================
-- PHASE 4: Create forum_reports table
-- ============================================================

CREATE TABLE IF NOT EXISTS forum_reports (
    id SERIAL PRIMARY KEY,
    reporter_id INTEGER NOT NULL REFERENCES users(id),

    -- Polymorphic relationship
    content_type VARCHAR(20) NOT NULL CHECK (content_type IN ('topic', 'reply')),
    topic_id INTEGER REFERENCES forum_topics(id) ON DELETE CASCADE,
    reply_id INTEGER REFERENCES forum_replies(id) ON DELETE CASCADE,

    reason VARCHAR(50) NOT NULL CHECK (reason IN ('spam', 'offensive', 'off-topic', 'other')),
    description TEXT,

    status VARCHAR(20) DEFAULT 'pending' CHECK (status IN ('pending', 'reviewed', 'dismissed')),
    reviewed_by INTEGER REFERENCES users(id),
    reviewed_at TIMESTAMP,
    review_note TEXT,

    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,

    -- Ensure at least one of topic_id or reply_id is set
    CONSTRAINT chk_forum_report_content CHECK (
        (content_type = 'topic' AND topic_id IS NOT NULL AND reply_id IS NULL) OR
        (content_type = 'reply' AND reply_id IS NOT NULL)
    )
);

-- Indexes for reports
CREATE INDEX IF NOT EXISTS idx_forum_reports_status ON forum_reports(status);
CREATE INDEX IF NOT EXISTS idx_forum_reports_reporter ON forum_reports(reporter_id);
CREATE INDEX IF NOT EXISTS idx_forum_reports_topic ON forum_reports(topic_id);
CREATE INDEX IF NOT EXISTS idx_forum_reports_reply ON forum_reports(reply_id);

-- ============================================================
-- PHASE 5: Create forum_edit_history table
-- ============================================================

CREATE TABLE IF NOT EXISTS forum_edit_history (
    id SERIAL PRIMARY KEY,

    -- Polymorphic relationship
    content_type VARCHAR(20) NOT NULL CHECK (content_type IN ('topic', 'reply')),
    topic_id INTEGER REFERENCES forum_topics(id) ON DELETE CASCADE,
    reply_id INTEGER REFERENCES forum_replies(id) ON DELETE CASCADE,

    editor_id INTEGER NOT NULL REFERENCES users(id),
    old_content TEXT NOT NULL,
    new_content TEXT NOT NULL,
    edit_reason VARCHAR(255),

    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,

    -- Ensure at least one of topic_id or reply_id is set
    CONSTRAINT chk_forum_edit_history_content CHECK (
        (content_type = 'topic' AND topic_id IS NOT NULL AND reply_id IS NULL) OR
        (content_type = 'reply' AND reply_id IS NOT NULL)
    )
);

-- Indexes for edit history
CREATE INDEX IF NOT EXISTS idx_forum_edit_history_topic ON forum_edit_history(topic_id);
CREATE INDEX IF NOT EXISTS idx_forum_edit_history_reply ON forum_edit_history(reply_id);
CREATE INDEX IF NOT EXISTS idx_forum_edit_history_editor ON forum_edit_history(editor_id);

-- ============================================================
-- PHASE 6: Additional indexes for performance
-- ============================================================

-- Index for soft-deleted topics (admin queries)
CREATE INDEX IF NOT EXISTS idx_forum_topics_is_deleted ON forum_topics(is_deleted) WHERE is_deleted = TRUE;

-- Index for soft-deleted replies (admin queries)
CREATE INDEX IF NOT EXISTS idx_forum_replies_is_deleted ON forum_replies(is_deleted) WHERE is_deleted = TRUE;

-- Index for solution replies
CREATE INDEX IF NOT EXISTS idx_forum_replies_is_solution ON forum_replies(is_solution) WHERE is_solution = TRUE;

-- ============================================================
-- PHASE 7: Grant permissions
-- ============================================================

GRANT ALL ON TABLE forum_topic_subscriptions TO nordabiz_app;
GRANT ALL ON TABLE forum_reports TO nordabiz_app;
GRANT ALL ON TABLE forum_edit_history TO nordabiz_app;

GRANT USAGE, SELECT ON SEQUENCE forum_topic_subscriptions_id_seq TO nordabiz_app;
GRANT USAGE, SELECT ON SEQUENCE forum_reports_id_seq TO nordabiz_app;
GRANT USAGE, SELECT ON SEQUENCE forum_edit_history_id_seq TO nordabiz_app;

-- ============================================================
-- VERIFICATION QUERIES
-- ============================================================

-- Verify new columns in forum_topics
-- SELECT column_name, data_type FROM information_schema.columns
-- WHERE table_name = 'forum_topics' AND column_name IN ('edited_at', 'edited_by', 'edit_count', 'is_deleted', 'deleted_at', 'deleted_by', 'reactions');

-- Verify new columns in forum_replies
-- SELECT column_name, data_type FROM information_schema.columns
-- WHERE table_name = 'forum_replies' AND column_name IN ('edited_at', 'edited_by', 'edit_count', 'is_deleted', 'deleted_at', 'deleted_by', 'reactions', 'is_solution', 'marked_as_solution_by', 'marked_as_solution_at');

-- Verify new tables
-- SELECT table_name FROM information_schema.tables WHERE table_name IN ('forum_topic_subscriptions', 'forum_reports', 'forum_edit_history');