import argparse
import csv
import io
import json
import os
import re
import sys

from googleapiclient.discovery import build
from googleapiclient.errors import HttpError

sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
from auth import get_credentials


def _get_sheets_service():
    creds = get_credentials()
    return build("sheets", "v4", credentials=creds)


def _extract_spreadsheet_id(value):
    match = re.search(r"/spreadsheets/d/([a-zA-Z0-9_-]+)", value)
    if match:
        return match.group(1)
    return value


def cmd_get_text(args):
    service = _get_sheets_service()
    sid = _extract_spreadsheet_id(args.spreadsheet_id)

    meta = service.spreadsheets().get(spreadsheetId=sid).execute()
    title = meta.get("properties", {}).get("title", "Untitled")

    output = io.StringIO()
    for sheet in meta.get("sheets", []):
        props = sheet.get("properties", {})
        sheet_name = props.get("title", "Sheet1")
        output.write(f"\n=== {sheet_name} ===\n")

        result = service.spreadsheets().values().get(
            spreadsheetId=sid, range=sheet_name
        ).execute()
        rows = result.get("values", [])

        if not rows:
            output.write("(empty)\n")
            continue

        if args.format == "csv":
            writer = csv.writer(output)
            for row in rows:
                writer.writerow(row)
            output.write("\n")
        elif args.format == "json":
            headers = rows[0] if rows else []
            data = [dict(zip(headers, row)) for row in rows[1:]] if args.format == "json" else rows
            output.write(json.dumps({title: data if args.format == "json" else rows}, indent=2))
            output.write("\n")
        else:
            output.write(f"Sheet: {sheet_name}\n")
            for row in rows:
                output.write(" | ".join(row) + "\n")
            output.write("\n")

    print(output.getvalue().strip())


def cmd_get_range(args):
    service = _get_sheets_service()
    sid = _extract_spreadsheet_id(args.spreadsheet_id)

    result = service.spreadsheets().values().get(
        spreadsheetId=sid, range=args.range
    ).execute()
    rows = result.get("values", [])

    if not rows:
        print("(empty)")
        return

    for row in rows:
        print(" | ".join(row))


def cmd_find(args):
    service = _get_sheets_service()
    result = service.spreadsheets().get(
        spreadsheetId="me", fields="files(id,name,mimeType)"
    ).execute()

    drive_service = build("drive", "v3", credentials=get_credentials())
    query = f"name contains '{args.query}' and mimeType = 'application/vnd.google-apps.spreadsheet'"
    results = drive_service.files().list(
        q=query,
        pageSize=args.limit,
        fields="files(id, name, modifiedTime)"
    ).execute()
    files = results.get("files", [])

    if not files:
        print(f"No spreadsheets found matching '{args.query}'")
        return

    for f in files:
        print(f"{f['name']:60s} {f['id']:50s} {f.get('modifiedTime', '')}")


def cmd_get_metadata(args):
    service = _get_sheets_service()
    sid = _extract_spreadsheet_id(args.spreadsheet_id)

    meta = service.spreadsheets().get(spreadsheetId=sid).execute()
    props = meta.get("properties", {})
    print(f"Title: {props.get('title')}")
    print(f"Locale: {props.get('locale')}")
    print(f"Timezone: {props.get('timeZone')}")
    print(f"URL: https://docs.google.com/spreadsheets/d/{sid}/edit")
    print()
    for sheet in meta.get("sheets", []):
        sp = sheet.get("properties", {})
        print(f"  Sheet: {sp.get('title')} (id={sp.get('sheetId')})")
        grid = sp.get("gridProperties", {})
        print(f"    Rows: {grid.get('rowCount')}, Cols: {grid.get('columnCount')}")


def cmd_update_range(args):
    service = _get_sheets_service()
    sid = _extract_spreadsheet_id(args.spreadsheet_id)

    try:
        values = json.loads(args.values)
    except json.JSONDecodeError as e:
        print(f"Invalid JSON: {e}")
        sys.exit(1)

    body = {
        "range": args.range,
        "values": values,
        "majorDimension": "ROWS",
    }
    value_input = "RAW" if args.raw else "USER_ENTERED"

    result = service.spreadsheets().values().update(
        spreadsheetId=sid,
        range=args.range,
        valueInputOption=value_input,
        body=body,
    ).execute()
    print(f"Updated {result.get('updatedCells')} cells.")


def cmd_append_rows(args):
    service = _get_sheets_service()
    sid = _extract_spreadsheet_id(args.spreadsheet_id)

    try:
        values = json.loads(args.values)
    except json.JSONDecodeError as e:
        print(f"Invalid JSON: {e}")
        sys.exit(1)

    body = {
        "range": args.range,
        "values": values,
        "majorDimension": "ROWS",
    }

    result = service.spreadsheets().values().append(
        spreadsheetId=sid,
        range=args.range,
        valueInputOption="USER_ENTERED",
        insertDataOption="INSERT_ROWS",
        body=body,
    ).execute()
    print(f"Appended to {result.get('updates', {}).get('updatedRange')}")


def cmd_clear_range(args):
    service = _get_sheets_service()
    sid = _extract_spreadsheet_id(args.spreadsheet_id)

    result = service.spreadsheets().values().clear(
        spreadsheetId=sid, range=args.range, body={}
    ).execute()
    print(f"Cleared range: {result.get('clearedRange')}")


def cmd_batch_update(args):
    service = _get_sheets_service()
    sid = _extract_spreadsheet_id(args.spreadsheet_id)

    try:
        requests = json.loads(args.requests_json)
    except json.JSONDecodeError as e:
        print(f"Invalid JSON: {e}")
        sys.exit(1)

    body = {"requests": requests if isinstance(requests, list) else [requests]}

    result = service.spreadsheets().batchUpdate(
        spreadsheetId=sid, body=body
    ).execute()
    print(f"Batch update completed. Replies: {len(result.get('replies', []))}")


def main():
    parser = argparse.ArgumentParser(description="Google Sheets Operations")
    sub = parser.add_subparsers(dest="command")

    p = sub.add_parser("get-text", help="Get spreadsheet content as text/csv/json")
    p.add_argument("spreadsheet_id", help="Spreadsheet ID or URL")
    p.add_argument("--format", choices=["text", "csv", "json"], default="text")

    p = sub.add_parser("get-range", help="Get values from a specific range")
    p.add_argument("spreadsheet_id", help="Spreadsheet ID or URL")
    p.add_argument("range", help="Range in A1 notation (e.g. Sheet1!A1:D10)")

    p = sub.add_parser("find", help="Find spreadsheets by name")
    p.add_argument("query", help="Search query")
    p.add_argument("--limit", type=int, default=10)

    p = sub.add_parser("get-metadata", help="Get spreadsheet metadata")
    p.add_argument("spreadsheet_id", help="Spreadsheet ID or URL")

    p = sub.add_parser("update-range", help="Update a range of cells")
    p.add_argument("spreadsheet_id", help="Spreadsheet ID or URL")
    p.add_argument("range", help="Range in A1 notation")
    p.add_argument("values", help="JSON 2D array of values")
    p.add_argument("--raw", action="store_true", help="Use RAW input (no formula parsing)")

    p = sub.add_parser("append-rows", help="Append rows to a sheet")
    p.add_argument("spreadsheet_id", help="Spreadsheet ID or URL")
    p.add_argument("range", help="Range in A1 notation (e.g. Sheet1!A:Z)")
    p.add_argument("values", help="JSON 2D array of rows")

    p = sub.add_parser("clear-range", help="Clear values from a range")
    p.add_argument("spreadsheet_id", help="Spreadsheet ID or URL")
    p.add_argument("range", help="Range in A1 notation")

    p = sub.add_parser("batch-update", help="Advanced batch update")
    p.add_argument("spreadsheet_id", help="Spreadsheet ID or URL")
    p.add_argument("requests_json", help="JSON array of batch update requests")

    args = parser.parse_args()

    if args.command == "get-text":
        cmd_get_text(args)
    elif args.command == "get-range":
        cmd_get_range(args)
    elif args.command == "find":
        cmd_find(args)
    elif args.command == "get-metadata":
        cmd_get_metadata(args)
    elif args.command == "update-range":
        cmd_update_range(args)
    elif args.command == "append-rows":
        cmd_append_rows(args)
    elif args.command == "clear-range":
        cmd_clear_range(args)
    elif args.command == "batch-update":
        cmd_batch_update(args)
    else:
        parser.print_help()


if __name__ == "__main__":
    main()