"""One-time migration: pull all TickTick tasks into the custom task manager SQLite DB."""

import json
import os
import sqlite3
import uuid
import urllib.request
from pathlib import Path

TICKTICK_TOKEN = os.environ.get("TICKTICK_ACCESS_TOKEN", "")
# Handle JSON-wrapped token
try:
    parsed = json.loads(TICKTICK_TOKEN)
    TICKTICK_TOKEN = parsed.get("access_token", TICKTICK_TOKEN)
except (json.JSONDecodeError, TypeError):
    pass

TICKTICK_BASE = "https://api.ticktick.com/open/v1"
DB_PATH = Path(os.environ.get("DB_PATH", "/app/data/tasks.db"))
GATEWAY_USER_ID = os.environ.get("GATEWAY_USER_ID", "3")  # Yusuf's gateway user ID
GATEWAY_USER_NAME = os.environ.get("GATEWAY_USER_NAME", "Yusuf")


def tt_request(path):
    url = f"{TICKTICK_BASE}/{path.lstrip('/')}"
    req = urllib.request.Request(url)
    req.add_header("Authorization", f"Bearer {TICKTICK_TOKEN}")
    with urllib.request.urlopen(req, timeout=15) as resp:
        return json.loads(resp.read())


def get_db():
    conn = sqlite3.connect(str(DB_PATH))
    conn.row_factory = sqlite3.Row
    conn.execute("PRAGMA foreign_keys = ON")
    conn.execute("PRAGMA journal_mode = WAL")
    return conn


def migrate():
    if not TICKTICK_TOKEN:
        print("ERROR: TICKTICK_ACCESS_TOKEN not set")
        return

    conn = get_db()
    c = conn.cursor()

    # Ensure user exists
    existing = c.execute("SELECT id FROM users WHERE id = ?", (GATEWAY_USER_ID,)).fetchone()
    if not existing:
        c.execute("INSERT INTO users (id, username, display_name) VALUES (?, ?, ?)",
                  (GATEWAY_USER_ID, GATEWAY_USER_NAME.lower(), GATEWAY_USER_NAME))
        conn.commit()

    # Ensure Inbox exists
    inbox = c.execute("SELECT id FROM projects WHERE user_id = ? AND is_inbox = 1", (GATEWAY_USER_ID,)).fetchone()
    if not inbox:
        inbox_id = str(uuid.uuid4())
        c.execute("INSERT INTO projects (id, user_id, name, is_inbox, sort_order) VALUES (?, ?, 'Inbox', 1, -1)",
                  (inbox_id, GATEWAY_USER_ID))
        conn.commit()
        inbox = c.execute("SELECT id FROM projects WHERE user_id = ? AND is_inbox = 1", (GATEWAY_USER_ID,)).fetchone()

    inbox_id = inbox["id"]

    # Fetch TickTick projects
    print("Fetching TickTick projects...")
    tt_projects = tt_request("/project")
    print(f"  Found {len(tt_projects)} projects")

    # Map TickTick project IDs to our project IDs
    project_map = {}  # tt_project_id -> our_project_id

    for tp in tt_projects:
        tt_id = tp["id"]
        name = tp.get("name", "Untitled")

        # Check if we already migrated this project (by name match)
        existing_proj = c.execute("SELECT id FROM projects WHERE user_id = ? AND name = ? AND is_inbox = 0",
                                   (GATEWAY_USER_ID, name)).fetchone()
        if existing_proj:
            project_map[tt_id] = existing_proj["id"]
            print(f"  Project '{name}' already exists, skipping creation")
        else:
            new_id = str(uuid.uuid4())
            is_shared = 1 if any(kw in name.lower() for kw in ["family", "shared"]) else 0
            c.execute("INSERT INTO projects (id, user_id, name, is_shared, sort_order) VALUES (?, ?, ?, ?, ?)",
                      (new_id, GATEWAY_USER_ID, name, is_shared, tp.get("sortOrder", 0)))
            project_map[tt_id] = new_id
            print(f"  Created project '{name}' (shared={is_shared})")

    conn.commit()

    # Fetch all tasks from each project + inbox
    all_tasks = []

    # Inbox
    print("Fetching Inbox tasks...")
    try:
        inbox_data = tt_request("/project/inbox/data")
        inbox_tasks = inbox_data.get("tasks", [])
        for t in inbox_tasks:
            t["_our_project_id"] = inbox_id
            t["_project_name"] = "Inbox"
        all_tasks.extend(inbox_tasks)
        print(f"  Inbox: {len(inbox_tasks)} tasks")
    except Exception as e:
        print(f"  Inbox error: {e}")

    # Other projects
    for tp in tt_projects:
        tt_id = tp["id"]
        name = tp.get("name", "?")
        try:
            data = tt_request(f"/project/{tt_id}/data")
            tasks = data.get("tasks", [])
            for t in tasks:
                t["_our_project_id"] = project_map.get(tt_id, inbox_id)
                t["_project_name"] = name
            all_tasks.extend(tasks)
            print(f"  {name}: {len(tasks)} tasks")
        except Exception as e:
            print(f"  {name} error: {e}")

    print(f"\nTotal tasks to migrate: {len(all_tasks)}")

    # Insert tasks
    migrated = 0
    skipped = 0
    for t in all_tasks:
        title = t.get("title", "").strip()
        if not title:
            skipped += 1
            continue

        # Check for duplicate by title + project
        existing_task = c.execute(
            "SELECT id FROM tasks WHERE title = ? AND project_id = ? AND user_id = ?",
            (title, t["_our_project_id"], GATEWAY_USER_ID)).fetchone()
        if existing_task:
            skipped += 1
            continue

        task_id = str(uuid.uuid4())
        status = t.get("status", 0)
        completed_at = None
        if status != 0:
            completed_at = t.get("completedTime") or t.get("modifiedTime")

        c.execute("""INSERT INTO tasks (id, project_id, user_id, title, content, status, priority,
                     start_date, due_date, is_all_day, completed_at, repeat_flag, sort_order, created_at)
                     VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)""",
                  (task_id, t["_our_project_id"], GATEWAY_USER_ID, title,
                   t.get("content", ""),
                   status,
                   t.get("priority", 0),
                   t.get("startDate"),
                   t.get("dueDate"),
                   1 if t.get("isAllDay", True) else 0,
                   completed_at,
                   t.get("repeatFlag"),
                   t.get("sortOrder", 0),
                   t.get("createdTime") or t.get("modifiedTime")))
        migrated += 1

    conn.commit()
    conn.close()

    print(f"\nMigration complete!")
    print(f"  Migrated: {migrated} tasks")
    print(f"  Skipped: {skipped} (duplicates or empty)")
    print(f"  Projects: {len(project_map) + 1} (including Inbox)")


if __name__ == "__main__":
    migrate()