"""FlowDeck — Database layer (SQLite with WAL mode)."""
from __future__ import annotations

import sqlite3
from contextlib import contextmanager
from pathlib import Path


def get_db_path() -> Path:
    from app.config import settings
    return settings.db_path


def init_db():
    """Create tables if they don't exist."""
    db_path = get_db_path()
    if str(db_path) != ":memory:":
        db_path.parent.mkdir(parents=True, exist_ok=True)

    with get_conn() as conn:
        conn.execute("PRAGMA journal_mode=WAL")
        conn.execute("PRAGMA foreign_keys=ON")
        conn.executescript("""
            CREATE TABLE IF NOT EXISTS users (
                id INTEGER PRIMARY KEY AUTOINCREMENT,
                login TEXT NOT NULL UNIQUE,
                full_name TEXT NOT NULL DEFAULT '',
                email TEXT NOT NULL DEFAULT '',
                avatar_url TEXT NOT NULL DEFAULT '',
                is_admin BOOLEAN NOT NULL DEFAULT 0,
                created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
            );

            CREATE TABLE IF NOT EXISTS user_tokens (
                id INTEGER PRIMARY KEY AUTOINCREMENT,
                gitea_user_id INTEGER NOT NULL UNIQUE,
                gitea_token TEXT NOT NULL,
                created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
                updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
            );

            CREATE TABLE IF NOT EXISTS boards (
                id INTEGER PRIMARY KEY AUTOINCREMENT,
                project_owner TEXT NOT NULL,
                project_name TEXT NOT NULL,
                columns_json TEXT NOT NULL DEFAULT '["Backlog","À faire","En cours","Révision","Terminé"]',
                wip_limits_json TEXT DEFAULT '{}',
                created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
                UNIQUE(project_owner, project_name)
            );

            CREATE TABLE IF NOT EXISTS cards (
                id INTEGER PRIMARY KEY AUTOINCREMENT,
                board_id INTEGER NOT NULL REFERENCES boards(id),
                gitea_issue_id INTEGER,
                column_name TEXT NOT NULL DEFAULT 'Backlog',
                position INTEGER NOT NULL DEFAULT 0,
                priority TEXT DEFAULT 'Medium',
                due_date TEXT,
                created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
                updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
            );

            CREATE TABLE IF NOT EXISTS notes (
                id INTEGER PRIMARY KEY AUTOINCREMENT,
                project_owner TEXT NOT NULL,
                project_name TEXT NOT NULL,
                title TEXT NOT NULL DEFAULT 'Notes',
                content TEXT NOT NULL DEFAULT '',
                created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
                updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
                UNIQUE(project_owner, project_name, title)
            );

            CREATE TABLE IF NOT EXISTS col_mapping (
                id INTEGER PRIMARY KEY AUTOINCREMENT,
                board_id INTEGER NOT NULL REFERENCES boards(id),
                column_name TEXT NOT NULL,
                gitea_label TEXT NOT NULL,
                close_issue BOOLEAN NOT NULL DEFAULT 0,
                UNIQUE(board_id, column_name)
            );

            CREATE TABLE IF NOT EXISTS checklists (
                id INTEGER PRIMARY KEY AUTOINCREMENT,
                board_id INTEGER NOT NULL,
                gitea_issue_id INTEGER NOT NULL,
                title TEXT NOT NULL DEFAULT 'Checklist',
                position INTEGER NOT NULL DEFAULT 0,
                created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
                UNIQUE(board_id, gitea_issue_id, title)
            );

            CREATE TABLE IF NOT EXISTS checklist_items (
                id INTEGER PRIMARY KEY AUTOINCREMENT,
                checklist_id INTEGER NOT NULL REFERENCES checklists(id) ON DELETE CASCADE,
                content TEXT NOT NULL DEFAULT '',
                checked BOOLEAN NOT NULL DEFAULT 0,
                position INTEGER NOT NULL DEFAULT 0,
                created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
            );

            CREATE TABLE IF NOT EXISTS project_properties (
                id INTEGER PRIMARY KEY AUTOINCREMENT,
                project_owner TEXT NOT NULL,
                project_name TEXT NOT NULL,
                name TEXT NOT NULL,
                prop_type TEXT NOT NULL DEFAULT 'select',  -- select, multi_select, date, person, text
                options_json TEXT DEFAULT '[]',             -- for select/multi_select
                position INTEGER NOT NULL DEFAULT 0,
                created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
                UNIQUE(project_owner, project_name, name)
            );

            CREATE TABLE IF NOT EXISTS property_values (
                id INTEGER PRIMARY KEY AUTOINCREMENT,
                property_id INTEGER NOT NULL REFERENCES project_properties(id) ON DELETE CASCADE,
                gitea_issue_id INTEGER NOT NULL,
                value TEXT NOT NULL DEFAULT '',
                UNIQUE(property_id, gitea_issue_id)
            );

            CREATE TABLE IF NOT EXISTS ai_keywords (
                id INTEGER PRIMARY KEY AUTOINCREMENT,
                project_owner TEXT NOT NULL,
                project_name TEXT NOT NULL,
                keyword TEXT NOT NULL,
                color TEXT NOT NULL DEFAULT '#787774',
                usage_count INTEGER NOT NULL DEFAULT 1,
                created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
                UNIQUE(project_owner, project_name, keyword)
            );

            CREATE TABLE IF NOT EXISTS pages (
                id INTEGER PRIMARY KEY AUTOINCREMENT,
                workspace TEXT NOT NULL,
                title TEXT NOT NULL DEFAULT 'New page',
                content TEXT NOT NULL DEFAULT '',
                parent_section TEXT DEFAULT 'Private',
                parent_id INTEGER REFERENCES pages(id),
                created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
                updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
            );
        """)
        # Migration: add parent_id if missing (v1.0.0+)
        try:
            conn.execute("ALTER TABLE pages ADD COLUMN parent_id INTEGER REFERENCES pages(id)")
        except sqlite3.OperationalError:
            pass
        # Migration: add sort_order for drag & drop tree reordering (v1.1.0+)
        try:
            conn.execute("ALTER TABLE pages ADD COLUMN sort_order INTEGER NOT NULL DEFAULT 0")
        except sqlite3.OperationalError:
            pass
        conn.commit()


@contextmanager
def get_conn():
    """Yield a SQLite connection (WAL mode, foreign keys on)."""
    db_path = get_db_path()
    conn = sqlite3.connect(str(db_path))
    conn.row_factory = sqlite3.Row
    conn.execute("PRAGMA journal_mode=WAL")
    conn.execute("PRAGMA foreign_keys=ON")
    try:
        yield conn
    finally:
        conn.close()