-- ============================================================================
-- migrate-v0.3.0.sql
-- Schema migration from v0.2.x → v0.3.0
--
-- Changes:
--   • entries:         namespace → folder, kind → type; add notes column
--   • audit_log:       namespace → folder, kind → type
--   • entries_history: namespace → folder, kind → type; add user_id column
--   • Unique index: (user_id, name) → (user_id, folder, name)
--     Same name in different folders is now allowed; no rename needed.
--
-- Safe to run multiple times (fully idempotent).
-- Preserves all data in users, entries, secrets.
-- ============================================================================

BEGIN;

-- ── entries: rename namespace→folder, kind→type ──────────────────────────────
DO $$ BEGIN
    IF EXISTS (
        SELECT 1 FROM information_schema.columns
        WHERE table_name = 'entries' AND column_name = 'namespace'
    ) THEN
        ALTER TABLE entries RENAME COLUMN namespace TO folder;
    END IF;
END $$;

DO $$ BEGIN
    IF EXISTS (
        SELECT 1 FROM information_schema.columns
        WHERE table_name = 'entries' AND column_name = 'kind'
    ) THEN
        ALTER TABLE entries RENAME COLUMN kind TO type;
    END IF;
END $$;

-- Set NOT NULL + default for folder/type in entries
DO $$ BEGIN
    IF EXISTS (
        SELECT 1 FROM information_schema.columns
        WHERE table_name = 'entries' AND column_name = 'folder'
    ) THEN
        UPDATE entries SET folder = '' WHERE folder IS NULL;
        ALTER TABLE entries ALTER COLUMN folder SET NOT NULL;
        ALTER TABLE entries ALTER COLUMN folder SET DEFAULT '';
    END IF;
END $$;

DO $$ BEGIN
    IF EXISTS (
        SELECT 1 FROM information_schema.columns
        WHERE table_name = 'entries' AND column_name = 'type'
    ) THEN
        UPDATE entries SET type = '' WHERE type IS NULL;
        ALTER TABLE entries ALTER COLUMN type SET NOT NULL;
        ALTER TABLE entries ALTER COLUMN type SET DEFAULT '';
    END IF;
END $$;

-- Add notes column to entries if missing
ALTER TABLE entries ADD COLUMN IF NOT EXISTS notes TEXT NOT NULL DEFAULT '';

-- ── audit_log: rename namespace→folder, kind→type ────────────────────────────
DO $$ BEGIN
    IF EXISTS (
        SELECT 1 FROM information_schema.columns
        WHERE table_name = 'audit_log' AND column_name = 'namespace'
    ) THEN
        ALTER TABLE audit_log RENAME COLUMN namespace TO folder;
    END IF;
END $$;

DO $$ BEGIN
    IF EXISTS (
        SELECT 1 FROM information_schema.columns
        WHERE table_name = 'audit_log' AND column_name = 'kind'
    ) THEN
        ALTER TABLE audit_log RENAME COLUMN kind TO type;
    END IF;
END $$;

DO $$ BEGIN
    IF EXISTS (
        SELECT 1 FROM information_schema.columns
        WHERE table_name = 'audit_log' AND column_name = 'folder'
    ) THEN
        UPDATE audit_log SET folder = '' WHERE folder IS NULL;
        ALTER TABLE audit_log ALTER COLUMN folder SET NOT NULL;
        ALTER TABLE audit_log ALTER COLUMN folder SET DEFAULT '';
    END IF;
END $$;

DO $$ BEGIN
    IF EXISTS (
        SELECT 1 FROM information_schema.columns
        WHERE table_name = 'audit_log' AND column_name = 'type'
    ) THEN
        UPDATE audit_log SET type = '' WHERE type IS NULL;
        ALTER TABLE audit_log ALTER COLUMN type SET NOT NULL;
        ALTER TABLE audit_log ALTER COLUMN type SET DEFAULT '';
    END IF;
END $$;

ALTER TABLE audit_log DROP COLUMN IF EXISTS actor;

-- ── entries_history: rename namespace→folder, kind→type; add user_id ─────────
DO $$ BEGIN
    IF EXISTS (
        SELECT 1 FROM information_schema.columns
        WHERE table_name = 'entries_history' AND column_name = 'namespace'
    ) THEN
        ALTER TABLE entries_history RENAME COLUMN namespace TO folder;
    END IF;
END $$;

DO $$ BEGIN
    IF EXISTS (
        SELECT 1 FROM information_schema.columns
        WHERE table_name = 'entries_history' AND column_name = 'kind'
    ) THEN
        ALTER TABLE entries_history RENAME COLUMN kind TO type;
    END IF;
END $$;

DO $$ BEGIN
    IF EXISTS (
        SELECT 1 FROM information_schema.columns
        WHERE table_name = 'entries_history' AND column_name = 'folder'
    ) THEN
        UPDATE entries_history SET folder = '' WHERE folder IS NULL;
        ALTER TABLE entries_history ALTER COLUMN folder SET NOT NULL;
        ALTER TABLE entries_history ALTER COLUMN folder SET DEFAULT '';
    END IF;
END $$;

DO $$ BEGIN
    IF EXISTS (
        SELECT 1 FROM information_schema.columns
        WHERE table_name = 'entries_history' AND column_name = 'type'
    ) THEN
        UPDATE entries_history SET type = '' WHERE type IS NULL;
        ALTER TABLE entries_history ALTER COLUMN type SET NOT NULL;
        ALTER TABLE entries_history ALTER COLUMN type SET DEFAULT '';
    END IF;
END $$;

ALTER TABLE entries_history ADD COLUMN IF NOT EXISTS user_id UUID;
ALTER TABLE entries_history DROP COLUMN IF EXISTS actor;

-- ── secrets_history: drop actor column ───────────────────────────────────────
ALTER TABLE secrets_history DROP COLUMN IF EXISTS actor;

-- ── Rebuild unique indexes: (user_id, folder, name) ──────────────────────────
-- Note: folder is now part of the key, so same name in different folders is
-- naturally distinct — no rename of existing rows needed.
DROP INDEX IF EXISTS idx_entries_unique_legacy;
DROP INDEX IF EXISTS idx_entries_unique_user;

CREATE UNIQUE INDEX IF NOT EXISTS idx_entries_unique_legacy
    ON entries(folder, name)
    WHERE user_id IS NULL;

CREATE UNIQUE INDEX IF NOT EXISTS idx_entries_unique_user
    ON entries(user_id, folder, name)
    WHERE user_id IS NOT NULL;

-- ── Replace old namespace/kind indexes with folder/type ──────────────────────
DROP INDEX IF EXISTS idx_entries_namespace;
DROP INDEX IF EXISTS idx_entries_kind;
DROP INDEX IF EXISTS idx_audit_log_ns_kind;
DROP INDEX IF EXISTS idx_entries_history_ns_kind_name;

CREATE INDEX IF NOT EXISTS idx_entries_folder
    ON entries(folder) WHERE folder <> '';
CREATE INDEX IF NOT EXISTS idx_entries_type
    ON entries(type) WHERE type <> '';
CREATE INDEX IF NOT EXISTS idx_entries_user_id
    ON entries(user_id) WHERE user_id IS NOT NULL;
CREATE INDEX IF NOT EXISTS idx_audit_log_folder_type
    ON audit_log(folder, type);
CREATE INDEX IF NOT EXISTS idx_entries_history_folder_type_name
    ON entries_history(folder, type, name, version DESC);
CREATE INDEX IF NOT EXISTS idx_entries_history_user_id
    ON entries_history(user_id) WHERE user_id IS NOT NULL;

COMMIT;

-- ── Verification queries (run these manually to confirm) ─────────────────────
-- SELECT column_name, data_type FROM information_schema.columns
--   WHERE table_name = 'entries' ORDER BY ordinal_position;
-- SELECT indexname, indexdef FROM pg_indexes WHERE tablename = 'entries';
-- SELECT COUNT(*) FROM entries;
-- SELECT COUNT(*) FROM users;
-- SELECT COUNT(*) FROM secrets;