"""
Kin — SQLite database schema and connection management.
All tables from DESIGN.md section 3.5 State Management.
"""

import sqlite3
from pathlib import Path

DB_PATH = Path(__file__).parent.parent / "kin.db"

SCHEMA = """
-- Проекты (центральный реестр)
CREATE TABLE IF NOT EXISTS projects (
    id TEXT PRIMARY KEY,
    name TEXT NOT NULL,
    path TEXT CHECK (path IS NOT NULL OR project_type = 'operations'),
    tech_stack JSON,
    status TEXT DEFAULT 'active',
    priority INTEGER DEFAULT 5,
    pm_prompt TEXT,
    claude_md_path TEXT,
    forgejo_repo TEXT,
    language TEXT DEFAULT 'ru',
    execution_mode TEXT NOT NULL DEFAULT 'review',
    deploy_command TEXT,
    project_type TEXT DEFAULT 'development',
    ssh_host TEXT,
    ssh_user TEXT,
    ssh_key_path TEXT,
    ssh_proxy_jump TEXT,
    description TEXT,
    autocommit_enabled INTEGER DEFAULT 0,
    obsidian_vault_path TEXT,
    worktrees_enabled INTEGER DEFAULT 0,
    auto_test_enabled INTEGER DEFAULT 0,
    test_command TEXT DEFAULT 'make test',
    created_at DATETIME DEFAULT CURRENT_TIMESTAMP
);

-- Задачи (привязаны к проекту)
CREATE TABLE IF NOT EXISTS tasks (
    id TEXT PRIMARY KEY,
    project_id TEXT NOT NULL REFERENCES projects(id),
    title TEXT NOT NULL,
    status TEXT DEFAULT 'pending',
    priority INTEGER DEFAULT 5,
    assigned_role TEXT,
    parent_task_id TEXT REFERENCES tasks(id),
    brief JSON,
    spec JSON,
    review JSON,
    test_result JSON,
    security_result JSON,
    forgejo_issue_id INTEGER,
    execution_mode TEXT,
    blocked_reason TEXT,
    blocked_at DATETIME,
    blocked_agent_role TEXT,
    blocked_pipeline_step TEXT,
    dangerously_skipped BOOLEAN DEFAULT 0,
    revise_comment TEXT,
    revise_count INTEGER DEFAULT 0,
    revise_target_role TEXT DEFAULT NULL,
    labels JSON,
    category TEXT DEFAULT NULL,
    telegram_sent BOOLEAN DEFAULT 0,
    acceptance_criteria TEXT,
    created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
    updated_at DATETIME DEFAULT CURRENT_TIMESTAMP
);

-- Решения и грабли (внешняя память PM-агента)
CREATE TABLE IF NOT EXISTS decisions (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    project_id TEXT NOT NULL REFERENCES projects(id),
    task_id TEXT REFERENCES tasks(id),
    type TEXT NOT NULL,
    category TEXT,
    title TEXT NOT NULL,
    description TEXT NOT NULL,
    tags JSON,
    created_at DATETIME DEFAULT CURRENT_TIMESTAMP
);

-- Логи агентов (дебаг, обучение, cost tracking)
CREATE TABLE IF NOT EXISTS agent_logs (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    project_id TEXT NOT NULL REFERENCES projects(id),
    task_id TEXT REFERENCES tasks(id),
    agent_role TEXT NOT NULL,
    session_id TEXT,
    action TEXT NOT NULL,
    input_summary TEXT,
    output_summary TEXT,
    tokens_used INTEGER,
    model TEXT,
    cost_usd REAL,
    success BOOLEAN,
    error_message TEXT,
    duration_seconds INTEGER,
    created_at DATETIME DEFAULT CURRENT_TIMESTAMP
);

-- Модули проекта (карта для PM)
CREATE TABLE IF NOT EXISTS modules (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    project_id TEXT NOT NULL REFERENCES projects(id),
    name TEXT NOT NULL,
    type TEXT NOT NULL,
    path TEXT NOT NULL,
    description TEXT,
    owner_role TEXT,
    dependencies JSON,
    UNIQUE(project_id, name)
);

-- Фазы исследования нового проекта (research workflow KIN-059)
CREATE TABLE IF NOT EXISTS project_phases (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    project_id TEXT NOT NULL REFERENCES projects(id),
    role TEXT NOT NULL,
    phase_order INTEGER NOT NULL,
    status TEXT DEFAULT 'pending',
    task_id TEXT REFERENCES tasks(id),
    revise_count INTEGER DEFAULT 0,
    revise_comment TEXT,
    created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
    updated_at DATETIME DEFAULT CURRENT_TIMESTAMP
);

CREATE INDEX IF NOT EXISTS idx_phases_project ON project_phases(project_id, phase_order);

-- Pipelines (история запусков)
CREATE TABLE IF NOT EXISTS pipelines (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    task_id TEXT NOT NULL REFERENCES tasks(id),
    project_id TEXT NOT NULL REFERENCES projects(id),
    route_type TEXT NOT NULL,
    steps JSON NOT NULL,
    status TEXT DEFAULT 'running',
    total_cost_usd REAL,
    total_tokens INTEGER,
    total_duration_seconds INTEGER,
    parent_pipeline_id INTEGER REFERENCES pipelines(id),
    department TEXT,
    created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
    completed_at DATETIME
);

-- Межотдельные handoff-ы (KIN-098)
CREATE TABLE IF NOT EXISTS department_handoffs (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    pipeline_id INTEGER NOT NULL REFERENCES pipelines(id),
    task_id TEXT NOT NULL REFERENCES tasks(id),
    from_department TEXT NOT NULL,
    to_department TEXT,
    artifacts JSON,
    decisions_made JSON,
    blockers JSON,
    status TEXT DEFAULT 'pending',
    created_at DATETIME DEFAULT CURRENT_TIMESTAMP
);

CREATE INDEX IF NOT EXISTS idx_handoffs_pipeline ON department_handoffs(pipeline_id);
CREATE INDEX IF NOT EXISTS idx_handoffs_task ON department_handoffs(task_id);

-- Post-pipeline хуки
CREATE TABLE IF NOT EXISTS hooks (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    project_id TEXT NOT NULL REFERENCES projects(id),
    name TEXT NOT NULL,
    event TEXT NOT NULL,
    trigger_module_path TEXT,
    trigger_module_type TEXT,
    command TEXT NOT NULL,
    working_dir TEXT,
    timeout_seconds INTEGER DEFAULT 120,
    enabled INTEGER DEFAULT 1,
    created_at TEXT DEFAULT (datetime('now'))
);

-- Лог выполнений хуков
CREATE TABLE IF NOT EXISTS hook_logs (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    hook_id INTEGER NOT NULL REFERENCES hooks(id),
    project_id TEXT NOT NULL REFERENCES projects(id),
    task_id TEXT,
    success INTEGER NOT NULL,
    exit_code INTEGER,
    output TEXT,
    error TEXT,
    duration_seconds REAL,
    created_at TEXT DEFAULT (datetime('now'))
);

-- Аудит-лог опасных операций (dangerously-skip-permissions)
CREATE TABLE IF NOT EXISTS audit_log (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    timestamp DATETIME DEFAULT CURRENT_TIMESTAMP,
    task_id TEXT REFERENCES tasks(id),
    step_id TEXT,
    event_type TEXT NOT NULL DEFAULT 'dangerous_skip',
    reason TEXT,
    project_id TEXT REFERENCES projects(id)
);

CREATE INDEX IF NOT EXISTS idx_audit_log_task ON audit_log(task_id);
CREATE INDEX IF NOT EXISTS idx_audit_log_event ON audit_log(event_type, timestamp);

-- Кросс-проектные зависимости
CREATE TABLE IF NOT EXISTS project_links (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    from_project TEXT NOT NULL REFERENCES projects(id),
    to_project TEXT NOT NULL REFERENCES projects(id),
    type TEXT NOT NULL,
    description TEXT,
    created_at DATETIME DEFAULT CURRENT_TIMESTAMP
);

-- Тикеты от пользователей
CREATE TABLE IF NOT EXISTS support_tickets (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    project_id TEXT NOT NULL REFERENCES projects(id),
    source TEXT NOT NULL,
    client_id TEXT,
    client_message TEXT NOT NULL,
    classification TEXT,
    guard_result TEXT,
    guard_reason TEXT,
    anamnesis JSON,
    task_id TEXT REFERENCES tasks(id),
    response TEXT,
    response_approved BOOLEAN DEFAULT FALSE,
    status TEXT DEFAULT 'new',
    created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
    resolved_at DATETIME
);

-- Настройки бота для каждого проекта
CREATE TABLE IF NOT EXISTS support_bot_config (
    project_id TEXT PRIMARY KEY REFERENCES projects(id),
    telegram_bot_token TEXT,
    welcome_message TEXT,
    faq JSON,
    auto_reply BOOLEAN DEFAULT FALSE,
    require_approval BOOLEAN DEFAULT TRUE,
    brand_voice TEXT,
    forbidden_topics JSON,
    escalation_keywords JSON
);

-- Среды развёртывания проекта (prod/dev серверы)
CREATE TABLE IF NOT EXISTS project_environments (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    project_id TEXT NOT NULL REFERENCES projects(id),
    name TEXT NOT NULL,
    host TEXT NOT NULL,
    port INTEGER DEFAULT 22,
    username TEXT NOT NULL,
    auth_type TEXT NOT NULL DEFAULT 'password',
    auth_value TEXT,
    is_installed INTEGER NOT NULL DEFAULT 0,
    created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
    updated_at DATETIME DEFAULT CURRENT_TIMESTAMP,
    UNIQUE(project_id, name)
);

CREATE INDEX IF NOT EXISTS idx_environments_project ON project_environments(project_id);

-- Индексы
CREATE INDEX IF NOT EXISTS idx_tasks_project_status ON tasks(project_id, status);
CREATE INDEX IF NOT EXISTS idx_decisions_project ON decisions(project_id);
CREATE INDEX IF NOT EXISTS idx_decisions_tags ON decisions(tags);
CREATE INDEX IF NOT EXISTS idx_agent_logs_project ON agent_logs(project_id, created_at);
CREATE INDEX IF NOT EXISTS idx_agent_logs_cost ON agent_logs(project_id, cost_usd);
CREATE INDEX IF NOT EXISTS idx_tickets_project ON support_tickets(project_id, status);
CREATE INDEX IF NOT EXISTS idx_tickets_client ON support_tickets(client_id);

-- Чат-сообщения (KIN-OBS-012)
CREATE TABLE IF NOT EXISTS chat_messages (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    project_id TEXT NOT NULL REFERENCES projects(id),
    role TEXT NOT NULL,
    content TEXT NOT NULL,
    message_type TEXT DEFAULT 'text',
    task_id TEXT REFERENCES tasks(id),
    created_at DATETIME DEFAULT CURRENT_TIMESTAMP
);

CREATE INDEX IF NOT EXISTS idx_chat_messages_project ON chat_messages(project_id, created_at);

-- Вложения задач (KIN-090)
CREATE TABLE IF NOT EXISTS task_attachments (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    task_id TEXT NOT NULL REFERENCES tasks(id) ON DELETE CASCADE,
    filename TEXT NOT NULL,
    path TEXT NOT NULL,
    mime_type TEXT NOT NULL,
    size INTEGER NOT NULL,
    created_at TEXT NOT NULL DEFAULT (datetime('now'))
);

CREATE INDEX IF NOT EXISTS idx_task_attachments_task ON task_attachments(task_id);
"""


def get_connection(db_path: Path = DB_PATH) -> sqlite3.Connection:
    conn = sqlite3.connect(str(db_path))
    conn.execute("PRAGMA journal_mode=WAL")
    conn.execute("PRAGMA foreign_keys=ON")
    conn.row_factory = sqlite3.Row
    return conn


def _migrate(conn: sqlite3.Connection):
    """Run migrations for existing databases."""
    # Check if language column exists on projects
    proj_cols = {r[1] for r in conn.execute("PRAGMA table_info(projects)").fetchall()}
    if "language" not in proj_cols:
        conn.execute("ALTER TABLE projects ADD COLUMN language TEXT DEFAULT 'ru'")
        conn.commit()
    if "execution_mode" not in proj_cols:
        conn.execute("ALTER TABLE projects ADD COLUMN execution_mode TEXT NOT NULL DEFAULT 'review'")
        conn.commit()

    # Check if execution_mode column exists on tasks
    task_cols = {r[1] for r in conn.execute("PRAGMA table_info(tasks)").fetchall()}
    if "execution_mode" not in task_cols:
        conn.execute("ALTER TABLE tasks ADD COLUMN execution_mode TEXT")
        conn.commit()
    if "blocked_reason" not in task_cols:
        conn.execute("ALTER TABLE tasks ADD COLUMN blocked_reason TEXT")
        conn.commit()

    if "autocommit_enabled" not in proj_cols:
        conn.execute("ALTER TABLE projects ADD COLUMN autocommit_enabled INTEGER DEFAULT 0")
        conn.commit()

    if "dangerously_skipped" not in task_cols:
        conn.execute("ALTER TABLE tasks ADD COLUMN dangerously_skipped BOOLEAN DEFAULT 0")
        conn.commit()

    if "revise_comment" not in task_cols:
        conn.execute("ALTER TABLE tasks ADD COLUMN revise_comment TEXT")
        conn.commit()

    if "category" not in task_cols:
        conn.execute("ALTER TABLE tasks ADD COLUMN category TEXT DEFAULT NULL")
        conn.commit()

    if "blocked_at" not in task_cols:
        conn.execute("ALTER TABLE tasks ADD COLUMN blocked_at DATETIME")
        conn.commit()
    if "blocked_agent_role" not in task_cols:
        conn.execute("ALTER TABLE tasks ADD COLUMN blocked_agent_role TEXT")
        conn.commit()
    if "blocked_pipeline_step" not in task_cols:
        conn.execute("ALTER TABLE tasks ADD COLUMN blocked_pipeline_step TEXT")
        conn.commit()

    if "telegram_sent" not in task_cols:
        conn.execute("ALTER TABLE tasks ADD COLUMN telegram_sent BOOLEAN DEFAULT 0")
        conn.commit()

    if "acceptance_criteria" not in task_cols:
        conn.execute("ALTER TABLE tasks ADD COLUMN acceptance_criteria TEXT")
        conn.commit()

    if "revise_count" not in task_cols:
        conn.execute("ALTER TABLE tasks ADD COLUMN revise_count INTEGER DEFAULT 0")
        conn.commit()

    if "labels" not in task_cols:
        conn.execute("ALTER TABLE tasks ADD COLUMN labels JSON DEFAULT NULL")
        conn.commit()

    if "revise_target_role" not in task_cols:
        conn.execute("ALTER TABLE tasks ADD COLUMN revise_target_role TEXT DEFAULT NULL")
        conn.commit()

    if "obsidian_vault_path" not in proj_cols:
        conn.execute("ALTER TABLE projects ADD COLUMN obsidian_vault_path TEXT")
        conn.commit()

    if "worktrees_enabled" not in proj_cols:
        conn.execute("ALTER TABLE projects ADD COLUMN worktrees_enabled INTEGER DEFAULT 0")
        conn.commit()

    if "auto_test_enabled" not in proj_cols:
        conn.execute("ALTER TABLE projects ADD COLUMN auto_test_enabled INTEGER DEFAULT 0")
        conn.commit()

    if "deploy_command" not in proj_cols:
        conn.execute("ALTER TABLE projects ADD COLUMN deploy_command TEXT")
        conn.commit()

    if "project_type" not in proj_cols:
        conn.execute("ALTER TABLE projects ADD COLUMN project_type TEXT DEFAULT 'development'")
        conn.commit()

    if "ssh_host" not in proj_cols:
        conn.execute("ALTER TABLE projects ADD COLUMN ssh_host TEXT")
        conn.commit()

    if "ssh_user" not in proj_cols:
        conn.execute("ALTER TABLE projects ADD COLUMN ssh_user TEXT")
        conn.commit()

    if "ssh_key_path" not in proj_cols:
        conn.execute("ALTER TABLE projects ADD COLUMN ssh_key_path TEXT")
        conn.commit()

    if "ssh_proxy_jump" not in proj_cols:
        conn.execute("ALTER TABLE projects ADD COLUMN ssh_proxy_jump TEXT")
        conn.commit()

    if "description" not in proj_cols:
        conn.execute("ALTER TABLE projects ADD COLUMN description TEXT")
        conn.commit()

    # Migrate audit_log + project_phases tables
    existing_tables = {r[0] for r in conn.execute(
        "SELECT name FROM sqlite_master WHERE type='table'"
    ).fetchall()}
    if "project_environments" not in existing_tables:
        conn.executescript("""
            CREATE TABLE IF NOT EXISTS project_environments (
                id INTEGER PRIMARY KEY AUTOINCREMENT,
                project_id TEXT NOT NULL REFERENCES projects(id),
                name TEXT NOT NULL,
                host TEXT NOT NULL,
                port INTEGER DEFAULT 22,
                username TEXT NOT NULL,
                auth_type TEXT NOT NULL DEFAULT 'password',
                auth_value TEXT,
                is_installed INTEGER NOT NULL DEFAULT 0,
                created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
                updated_at DATETIME DEFAULT CURRENT_TIMESTAMP,
                UNIQUE(project_id, name)
            );
            CREATE INDEX IF NOT EXISTS idx_environments_project ON project_environments(project_id);
        """)
        conn.commit()

    # Migrate project_environments: old schema used label/login/credential,
    # new schema uses name/username/auth_value (KIN-087 column rename).
    env_cols = {r[1] for r in conn.execute("PRAGMA table_info(project_environments)").fetchall()}
    if "name" not in env_cols and "label" in env_cols:
        conn.executescript("""
            PRAGMA foreign_keys=OFF;
            CREATE TABLE project_environments_new (
                id INTEGER PRIMARY KEY AUTOINCREMENT,
                project_id TEXT NOT NULL REFERENCES projects(id),
                name TEXT NOT NULL,
                host TEXT NOT NULL,
                port INTEGER DEFAULT 22,
                username TEXT NOT NULL,
                auth_type TEXT NOT NULL DEFAULT 'password',
                auth_value TEXT,
                is_installed INTEGER NOT NULL DEFAULT 0,
                created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
                updated_at DATETIME DEFAULT CURRENT_TIMESTAMP,
                UNIQUE(project_id, name)
            );
            INSERT INTO project_environments_new
                SELECT id, project_id, label, host, port, login, auth_type,
                       credential, is_installed, created_at, updated_at
                FROM project_environments;
            DROP TABLE project_environments;
            ALTER TABLE project_environments_new RENAME TO project_environments;
            CREATE INDEX IF NOT EXISTS idx_environments_project ON project_environments(project_id);
            PRAGMA foreign_keys=ON;
        """)
        conn.commit()

    if "project_phases" not in existing_tables:
        conn.executescript("""
            CREATE TABLE IF NOT EXISTS project_phases (
                id INTEGER PRIMARY KEY AUTOINCREMENT,
                project_id TEXT NOT NULL REFERENCES projects(id),
                role TEXT NOT NULL,
                phase_order INTEGER NOT NULL,
                status TEXT DEFAULT 'pending',
                task_id TEXT REFERENCES tasks(id),
                revise_count INTEGER DEFAULT 0,
                created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
                updated_at DATETIME DEFAULT CURRENT_TIMESTAMP
            );
            CREATE INDEX IF NOT EXISTS idx_phases_project ON project_phases(project_id, phase_order);
        """)
        conn.commit()
    # Migrate project_phases columns (table may already exist without revise_comment)
    phase_cols = {r[1] for r in conn.execute("PRAGMA table_info(project_phases)").fetchall()}
    if "revise_comment" not in phase_cols:
        conn.execute("ALTER TABLE project_phases ADD COLUMN revise_comment TEXT")
        conn.commit()

    if "audit_log" not in existing_tables:
        conn.executescript("""
            CREATE TABLE IF NOT EXISTS audit_log (
                id INTEGER PRIMARY KEY AUTOINCREMENT,
                timestamp DATETIME DEFAULT CURRENT_TIMESTAMP,
                task_id TEXT REFERENCES tasks(id),
                step_id TEXT,
                event_type TEXT NOT NULL DEFAULT 'dangerous_skip',
                reason TEXT,
                project_id TEXT REFERENCES projects(id)
            );
            CREATE INDEX IF NOT EXISTS idx_audit_log_task ON audit_log(task_id);
            CREATE INDEX IF NOT EXISTS idx_audit_log_event ON audit_log(event_type, timestamp);
        """)
        conn.commit()

    # Migrate columns that must exist before table recreation (KIN-UI-002)
    # These columns are referenced in the INSERT SELECT below but were not added
    # by any prior ALTER TABLE in this chain — causing OperationalError on minimal schemas.
    if "tech_stack" not in proj_cols:
        conn.execute("ALTER TABLE projects ADD COLUMN tech_stack JSON DEFAULT NULL")
        conn.commit()

    if "priority" not in proj_cols:
        conn.execute("ALTER TABLE projects ADD COLUMN priority INTEGER DEFAULT 5")
        conn.commit()

    if "pm_prompt" not in proj_cols:
        conn.execute("ALTER TABLE projects ADD COLUMN pm_prompt TEXT DEFAULT NULL")
        conn.commit()

    if "claude_md_path" not in proj_cols:
        conn.execute("ALTER TABLE projects ADD COLUMN claude_md_path TEXT DEFAULT NULL")
        conn.commit()

    if "forgejo_repo" not in proj_cols:
        conn.execute("ALTER TABLE projects ADD COLUMN forgejo_repo TEXT DEFAULT NULL")
        conn.commit()

    if "created_at" not in proj_cols:
        # SQLite ALTER TABLE does not allow non-constant defaults like CURRENT_TIMESTAMP
        conn.execute("ALTER TABLE projects ADD COLUMN created_at DATETIME DEFAULT NULL")
        conn.commit()

    # Migrate projects.path from NOT NULL to nullable (KIN-ARCH-003)
    # SQLite doesn't support ALTER COLUMN, so we recreate the table.
    path_col_rows = conn.execute("PRAGMA table_info(projects)").fetchall()
    path_col = next((r for r in path_col_rows if r[1] == "path"), None)
    if path_col and path_col[3] == 1:  # notnull == 1, migration needed
        conn.executescript("""
            PRAGMA foreign_keys=OFF;
            CREATE TABLE projects_new (
                id TEXT PRIMARY KEY,
                name TEXT NOT NULL,
                path TEXT CHECK (path IS NOT NULL OR project_type = 'operations'),
                tech_stack JSON,
                status TEXT DEFAULT 'active',
                priority INTEGER DEFAULT 5,
                pm_prompt TEXT,
                claude_md_path TEXT,
                forgejo_repo TEXT,
                language TEXT DEFAULT 'ru',
                execution_mode TEXT NOT NULL DEFAULT 'review',
                deploy_command TEXT,
                project_type TEXT DEFAULT 'development',
                ssh_host TEXT,
                ssh_user TEXT,
                ssh_key_path TEXT,
                ssh_proxy_jump TEXT,
                description TEXT,
                created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
                autocommit_enabled INTEGER DEFAULT 0,
                obsidian_vault_path TEXT
            );
            INSERT INTO projects_new
                SELECT id, name, path, tech_stack, status, priority,
                       pm_prompt, claude_md_path, forgejo_repo, language,
                       execution_mode, deploy_command, project_type,
                       ssh_host, ssh_user, ssh_key_path, ssh_proxy_jump,
                       description, created_at, autocommit_enabled, obsidian_vault_path
                FROM projects;
            DROP TABLE projects;
            ALTER TABLE projects_new RENAME TO projects;
            PRAGMA foreign_keys=ON;
        """)

    if "chat_messages" not in existing_tables:
        conn.executescript("""
            CREATE TABLE IF NOT EXISTS chat_messages (
                id INTEGER PRIMARY KEY AUTOINCREMENT,
                project_id TEXT NOT NULL REFERENCES projects(id),
                role TEXT NOT NULL,
                content TEXT NOT NULL,
                message_type TEXT DEFAULT 'text',
                task_id TEXT REFERENCES tasks(id),
                created_at DATETIME DEFAULT CURRENT_TIMESTAMP
            );
            CREATE INDEX IF NOT EXISTS idx_chat_messages_project ON chat_messages(project_id, created_at);
        """)
        conn.commit()

    if "task_attachments" not in existing_tables:
        conn.executescript("""
            CREATE TABLE IF NOT EXISTS task_attachments (
                id INTEGER PRIMARY KEY AUTOINCREMENT,
                task_id TEXT NOT NULL REFERENCES tasks(id) ON DELETE CASCADE,
                filename TEXT NOT NULL,
                path TEXT NOT NULL,
                mime_type TEXT NOT NULL,
                size INTEGER NOT NULL,
                created_at TEXT NOT NULL DEFAULT (datetime('now'))
            );
            CREATE INDEX IF NOT EXISTS idx_task_attachments_task ON task_attachments(task_id);
        """)
        conn.commit()

    # Migrate pipelines: add parent_pipeline_id and department columns (KIN-098)
    # Guard: table may not exist in legacy schemas without pipelines (old test fixtures)
    if "pipelines" in existing_tables:
        pipeline_cols = {r[1] for r in conn.execute("PRAGMA table_info(pipelines)").fetchall()}
        if "parent_pipeline_id" not in pipeline_cols:
            conn.execute("ALTER TABLE pipelines ADD COLUMN parent_pipeline_id INTEGER REFERENCES pipelines(id)")
            conn.commit()
        if "department" not in pipeline_cols:
            conn.execute("ALTER TABLE pipelines ADD COLUMN department TEXT")
            conn.commit()
        if "pid" not in pipeline_cols:
            conn.execute("ALTER TABLE pipelines ADD COLUMN pid INTEGER")
            conn.commit()

    # Create department_handoffs table (KIN-098)
    if "department_handoffs" not in existing_tables:
        conn.executescript("""
            CREATE TABLE IF NOT EXISTS department_handoffs (
                id INTEGER PRIMARY KEY AUTOINCREMENT,
                pipeline_id INTEGER NOT NULL REFERENCES pipelines(id),
                task_id TEXT NOT NULL REFERENCES tasks(id),
                from_department TEXT NOT NULL,
                to_department TEXT,
                artifacts JSON,
                decisions_made JSON,
                blockers JSON,
                status TEXT DEFAULT 'pending',
                created_at DATETIME DEFAULT CURRENT_TIMESTAMP
            );
            CREATE INDEX IF NOT EXISTS idx_handoffs_pipeline ON department_handoffs(pipeline_id);
            CREATE INDEX IF NOT EXISTS idx_handoffs_task ON department_handoffs(task_id);
        """)
        conn.commit()

    # Add test_command column to projects (KIN-ARCH-008)
    projects_cols = {row["name"] for row in conn.execute("PRAGMA table_info(projects)")}
    if "test_command" not in projects_cols:
        conn.execute("ALTER TABLE projects ADD COLUMN test_command TEXT DEFAULT 'make test'")
        conn.commit()

    # Rename legacy 'auto' → 'auto_complete' (KIN-063)
    conn.execute(
        "UPDATE projects SET execution_mode = 'auto_complete' WHERE execution_mode = 'auto'"
    )
    conn.execute(
        "UPDATE tasks SET execution_mode = 'auto_complete' WHERE execution_mode = 'auto'"
    )
    conn.commit()

    # Fix orphaned dept_sub pipelines left in 'running' state due to double-create bug
    # (KIN-ARCH-012): before the fix, _execute_department_head_step created a pipeline
    # that was never updated, leaving ghost 'running' records in prod DB.
    conn.execute(
        "UPDATE pipelines SET status = 'failed' WHERE route_type = 'dept_sub' AND status = 'running'"
    )
    conn.commit()


def _seed_default_hooks(conn: sqlite3.Connection):
    """Seed default hooks for the kin project (idempotent).

    Creates rebuild-frontend hook only when:
    - project 'kin' exists in the projects table
    - the hook doesn't already exist (no duplicate)

    Also updates existing hooks to the correct command/config if outdated.
    """
    kin_row = conn.execute(
        "SELECT path FROM projects WHERE id = 'kin'"
    ).fetchone()
    if not kin_row or not kin_row["path"]:
        return

    _PROJECT_PATH = kin_row["path"].rstrip("/")
    _REBUILD_SCRIPT = f"{_PROJECT_PATH}/scripts/rebuild-frontend.sh"
    _REBUILD_TRIGGER = "web/frontend/*"
    _REBUILD_WORKDIR = _PROJECT_PATH

    exists = conn.execute(
        "SELECT 1 FROM hooks"
        " WHERE project_id = 'kin'"
        "   AND name = 'rebuild-frontend'"
        "   AND event = 'pipeline_completed'"
    ).fetchone()
    if not exists:
        conn.execute(
            """INSERT INTO hooks
               (project_id, name, event, trigger_module_path, command,
                working_dir, timeout_seconds, enabled)
               VALUES ('kin', 'rebuild-frontend', 'pipeline_completed',
                       ?, ?, ?, 300, 1)""",
            (_REBUILD_TRIGGER, _REBUILD_SCRIPT, _REBUILD_WORKDIR),
        )
    else:
        # Migrate existing hook: set trigger_module_path, correct command, working_dir
        conn.execute(
            """UPDATE hooks
               SET trigger_module_path = ?,
                   command = ?,
                   working_dir = ?,
                   timeout_seconds = 300
               WHERE project_id = 'kin' AND name = 'rebuild-frontend'""",
            (_REBUILD_TRIGGER, _REBUILD_SCRIPT, _REBUILD_WORKDIR),
        )
    conn.commit()

    # Enable autocommit for kin project (opt-in, idempotent)
    conn.execute(
        "UPDATE projects SET autocommit_enabled=1 WHERE id='kin' AND autocommit_enabled=0"
    )
    conn.commit()


def init_db(db_path: Path = DB_PATH) -> sqlite3.Connection:
    conn = get_connection(db_path)
    conn.executescript(SCHEMA)
    conn.commit()
    _migrate(conn)
    _seed_default_hooks(conn)
    return conn


if __name__ == "__main__":
    conn = init_db()
    tables = conn.execute(
        "SELECT name FROM sqlite_master WHERE type='table' ORDER BY name"
    ).fetchall()
    print(f"Initialized {len(tables)} tables:")
    for t in tables:
        print(f"  - {t['name']}")
    conn.close()