import sys
from pathlib import Path
from datetime import datetime
import re
import time
import os
import io
import qrcode
import logging
from flask import Flask, render_template, g, send_file, request, jsonify

# Configure logging, allowing override via LOG_LEVEL environment variable
log_level = os.environ.get("LOG_LEVEL", "INFO").upper()
logging.basicConfig(level=getattr(logging, log_level, logging.INFO), format='%(asctime)s - %(name)s:%(filename)s:%(lineno)d [%(funcName)s] - %(levelname)s - %(message)s')

# Add scripts directory to path to allow importing from it
scripts_dir = Path(__file__).parent / "scripts"
sys.path.append(str(scripts_dir))

from config import (
    ATTENDANCE_SHEET_ID, PAYMENTS_SHEET_ID, JUNIOR_SHEET_GID,
    BANK_ACCOUNT, CREDENTIALS_PATH, MONTHS_TO_SHOW,
)
from attendance import get_members_with_fees, get_junior_members_with_fees
from match_payments import reconcile, fetch_sheet_data, fetch_exceptions
from views import (
    build_adults_view_model,
    build_juniors_view_model,
    build_payments_view_model,
    adapt_junior_members,
)
from cache_utils import get_sheet_modified_time, read_cache, write_cache, _LAST_CHECKED, flush_cache
from sync_fio_to_sheets import sync_to_sheets
from infer_payments import infer_payments

def get_cached_data(cache_key, sheet_id, fetch_func, *args, serialize=None, deserialize=None, **kwargs):
    mod_time = get_sheet_modified_time(cache_key)
    if mod_time:
        cached = read_cache(cache_key, mod_time)
        if cached is not None:
            return deserialize(cached) if deserialize else cached
    data = fetch_func(*args, **kwargs)
    if mod_time:
        write_cache(cache_key, mod_time, serialize(data) if serialize else data)
    return data

def warmup_cache():
    """Pre-fetch all cached data so first request is fast."""
    logger = logging.getLogger(__name__)
    logger.info("Warming up cache...")
    credentials_path = CREDENTIALS_PATH

    get_cached_data("attendance_regular", ATTENDANCE_SHEET_ID, get_members_with_fees)
    get_cached_data("attendance_juniors", ATTENDANCE_SHEET_ID, get_junior_members_with_fees)
    get_cached_data("payments_transactions", PAYMENTS_SHEET_ID, fetch_sheet_data, PAYMENTS_SHEET_ID, credentials_path)
    get_cached_data("exceptions_dict", PAYMENTS_SHEET_ID, fetch_exceptions,
        PAYMENTS_SHEET_ID, credentials_path,
        serialize=lambda d: [[list(k), v] for k, v in d.items()],
        deserialize=lambda c: {tuple(k): v for k, v in c},
    )
    logger.info("Cache warmup complete.")

app = Flask(__name__)

import json as _json
_meta_path = Path(__file__).parent / "build_meta.json"
BUILD_META = _json.loads(_meta_path.read_text()) if _meta_path.exists() else {
    "tag": "dev", "commit": "local", "build_date": ""
}


def _unwrap_view_model_for_api(vm: dict) -> dict:
    """Expand pre-stringified JSON fields and rename to match Go API contract."""
    out = dict(vm)
    out["member_data"] = _json.loads(out.pop("member_data"))
    out["month_labels"] = _json.loads(out.pop("month_labels_json"))
    out["raw_payments"] = _json.loads(out.pop("raw_payments_json"))
    return out


warmup_cache()

@app.before_request
def start_timer():
    g.start_time = time.perf_counter()
    g.steps = []

def record_step(name):
    g.steps.append((name, time.perf_counter()))

@app.context_processor
def inject_render_time():
    def get_render_time():
        total = time.perf_counter() - g.start_time
        breakdown = []
        last_time = g.start_time
        for name, timestamp in g.steps:
            duration = timestamp - last_time
            breakdown.append(f"{name}:{duration:.3f}s")
            last_time = timestamp
        
        # Add remaining time as 'render'
        render_duration = time.perf_counter() - last_time
        breakdown.append(f"render:{render_duration:.3f}s")
        
        return {
            "total": f"{total:.3f}",
            "breakdown": " | ".join(breakdown)
        }
    return dict(get_render_time=get_render_time, build_meta=BUILD_META)

@app.route("/")
def index():
    # Redirect root to /adults for convenience while there are no other apps
    return '<meta http-equiv="refresh" content="0; url=/adults" />'

@app.route("/flush-cache", methods=["GET", "POST"])
def flush_cache_endpoint():
    if request.method == "GET":
        return render_template("flush-cache.html")
    deleted = flush_cache()
    return render_template("flush-cache.html", flushed=True, deleted=deleted)

@app.route("/sync-bank")
def sync_bank():
    import contextlib
    output = io.StringIO()
    success = True
    try:
        with contextlib.redirect_stdout(output), contextlib.redirect_stderr(output):
            # sync_to_sheets: equivalent of make sync-2026
            output.write("=== Syncing Fio transactions (2026) ===\n")
            sync_to_sheets(
                spreadsheet_id=PAYMENTS_SHEET_ID,
                credentials_path=CREDENTIALS_PATH,
                date_from_str="2026-01-01",
                date_to_str="2026-12-31",
                sort_by_date=True,
            )
            output.write("\n=== Inferring payment details ===\n")
            infer_payments(PAYMENTS_SHEET_ID, CREDENTIALS_PATH)
            output.write("\n=== Flushing cache ===\n")
            deleted = flush_cache()
            output.write(f"Deleted {deleted} cache files.\n")
            output.write("\n=== Done ===\n")
    except Exception as e:
        import traceback
        output.write(f"\n!!! Error: {e}\n")
        output.write(traceback.format_exc())
        success = False
    return render_template("sync.html", output=output.getvalue(), success=success)

@app.route("/version")
def version():
    return BUILD_META

@app.route("/api/version")
def api_version():
    return jsonify(BUILD_META)

@app.route("/api/adults")
def api_adults():
    attendance_url = f"https://docs.google.com/spreadsheets/d/{ATTENDANCE_SHEET_ID}/edit"
    payments_url = f"https://docs.google.com/spreadsheets/d/{PAYMENTS_SHEET_ID}/edit"
    members_data = get_cached_data("attendance_regular", ATTENDANCE_SHEET_ID, get_members_with_fees)
    if not members_data:
        return jsonify({"error": "no data"}), 503
    members, sorted_months = members_data
    transactions = get_cached_data("payments_transactions", PAYMENTS_SHEET_ID, fetch_sheet_data, PAYMENTS_SHEET_ID, CREDENTIALS_PATH)
    exceptions = get_cached_data(
        "exceptions_dict", PAYMENTS_SHEET_ID, fetch_exceptions,
        PAYMENTS_SHEET_ID, CREDENTIALS_PATH,
        serialize=lambda d: [[list(k), v] for k, v in d.items()],
        deserialize=lambda c: {tuple(k): v for k, v in c},
    )
    result = reconcile(members, sorted_months, transactions, exceptions)
    vm = build_adults_view_model(
        members, sorted_months, result, transactions,
        datetime.now().strftime("%Y-%m"),
        attendance_url=attendance_url, payments_url=payments_url, bank_account=BANK_ACCOUNT,
    )
    return jsonify(_unwrap_view_model_for_api(vm))

@app.route("/api/juniors")
def api_juniors():
    attendance_url = f"https://docs.google.com/spreadsheets/d/{ATTENDANCE_SHEET_ID}/edit#gid={JUNIOR_SHEET_GID}"
    payments_url = f"https://docs.google.com/spreadsheets/d/{PAYMENTS_SHEET_ID}/edit"
    junior_members_data = get_cached_data("attendance_juniors", ATTENDANCE_SHEET_ID, get_junior_members_with_fees)
    if not junior_members_data:
        return jsonify({"error": "no data"}), 503
    junior_members, sorted_months = junior_members_data
    transactions = get_cached_data("payments_transactions", PAYMENTS_SHEET_ID, fetch_sheet_data, PAYMENTS_SHEET_ID, CREDENTIALS_PATH)
    exceptions = get_cached_data(
        "exceptions_dict", PAYMENTS_SHEET_ID, fetch_exceptions,
        PAYMENTS_SHEET_ID, CREDENTIALS_PATH,
        serialize=lambda d: [[list(k), v] for k, v in d.items()],
        deserialize=lambda c: {tuple(k): v for k, v in c},
    )
    adapted_members = adapt_junior_members(junior_members)
    result = reconcile(adapted_members, sorted_months, transactions, exceptions)
    vm = build_juniors_view_model(
        junior_members, adapted_members, sorted_months, result, transactions,
        datetime.now().strftime("%Y-%m"),
        attendance_url=attendance_url, payments_url=payments_url, bank_account=BANK_ACCOUNT,
    )
    return jsonify(_unwrap_view_model_for_api(vm))

@app.route("/api/payments")
def api_payments():
    attendance_url = f"https://docs.google.com/spreadsheets/d/{ATTENDANCE_SHEET_ID}/edit"
    payments_url = f"https://docs.google.com/spreadsheets/d/{PAYMENTS_SHEET_ID}/edit"
    transactions = get_cached_data("payments_transactions", PAYMENTS_SHEET_ID, fetch_sheet_data, PAYMENTS_SHEET_ID, CREDENTIALS_PATH)
    adults_data = get_cached_data("attendance_regular", ATTENDANCE_SHEET_ID, get_members_with_fees)
    juniors_data = get_cached_data("attendance_juniors", ATTENDANCE_SHEET_ID, get_junior_members_with_fees)
    member_names = []
    if adults_data:
        member_names.extend(name for name, _, _ in adults_data[0])
    if juniors_data:
        member_names.extend(name for name, _, _ in juniors_data[0])
    vm = build_payments_view_model(
        transactions, member_names,
        attendance_url=attendance_url, payments_url=payments_url,
    )
    return jsonify(vm)

@app.route("/adults")
def adults_view():
    attendance_url = f"https://docs.google.com/spreadsheets/d/{ATTENDANCE_SHEET_ID}/edit"
    payments_url = f"https://docs.google.com/spreadsheets/d/{PAYMENTS_SHEET_ID}/edit"
    credentials_path = CREDENTIALS_PATH

    members_data = get_cached_data("attendance_regular", ATTENDANCE_SHEET_ID, get_members_with_fees)
    record_step("fetch_members")
    if not members_data:
        return "No data."
    members, sorted_months = members_data

    transactions = get_cached_data("payments_transactions", PAYMENTS_SHEET_ID, fetch_sheet_data, PAYMENTS_SHEET_ID, credentials_path)
    record_step("fetch_payments")
    exceptions = get_cached_data(
        "exceptions_dict", PAYMENTS_SHEET_ID, fetch_exceptions,
        PAYMENTS_SHEET_ID, credentials_path,
        serialize=lambda d: [[list(k), v] for k, v in d.items()],
        deserialize=lambda c: {tuple(k): v for k, v in c},
    )
    record_step("fetch_exceptions")
    result = reconcile(members, sorted_months, transactions, exceptions)
    record_step("reconcile")

    vm = build_adults_view_model(
        members, sorted_months, result, transactions,
        datetime.now().strftime("%Y-%m"),
        attendance_url=attendance_url,
        payments_url=payments_url,
        bank_account=BANK_ACCOUNT,
    )
    record_step("process_data")
    return render_template("adults.html", months_to_show=MONTHS_TO_SHOW, **vm)

@app.route("/juniors")
def juniors_view():
    attendance_url = f"https://docs.google.com/spreadsheets/d/{ATTENDANCE_SHEET_ID}/edit#gid={JUNIOR_SHEET_GID}"
    payments_url = f"https://docs.google.com/spreadsheets/d/{PAYMENTS_SHEET_ID}/edit"
    credentials_path = CREDENTIALS_PATH

    junior_members_data = get_cached_data("attendance_juniors", ATTENDANCE_SHEET_ID, get_junior_members_with_fees)
    record_step("fetch_junior_members")
    if not junior_members_data:
        return "No data."
    junior_members, sorted_months = junior_members_data

    transactions = get_cached_data("payments_transactions", PAYMENTS_SHEET_ID, fetch_sheet_data, PAYMENTS_SHEET_ID, credentials_path)
    record_step("fetch_payments")
    exceptions = get_cached_data(
        "exceptions_dict", PAYMENTS_SHEET_ID, fetch_exceptions,
        PAYMENTS_SHEET_ID, credentials_path,
        serialize=lambda d: [[list(k), v] for k, v in d.items()],
        deserialize=lambda c: {tuple(k): v for k, v in c},
    )
    record_step("fetch_exceptions")

    adapted_members = adapt_junior_members(junior_members)
    result = reconcile(adapted_members, sorted_months, transactions, exceptions)
    record_step("reconcile")

    vm = build_juniors_view_model(
        junior_members, adapted_members, sorted_months, result, transactions,
        datetime.now().strftime("%Y-%m"),
        attendance_url=attendance_url,
        payments_url=payments_url,
        bank_account=BANK_ACCOUNT,
    )
    record_step("process_data")
    return render_template("juniors.html", months_to_show=MONTHS_TO_SHOW, **vm)

@app.route("/payments")
def payments():
    attendance_url = f"https://docs.google.com/spreadsheets/d/{ATTENDANCE_SHEET_ID}/edit"
    payments_url = f"https://docs.google.com/spreadsheets/d/{PAYMENTS_SHEET_ID}/edit"
    credentials_path = CREDENTIALS_PATH

    transactions = get_cached_data("payments_transactions", PAYMENTS_SHEET_ID, fetch_sheet_data, PAYMENTS_SHEET_ID, credentials_path)
    record_step("fetch_payments")

    adults_data = get_cached_data("attendance_regular", ATTENDANCE_SHEET_ID, get_members_with_fees)
    juniors_data = get_cached_data("attendance_juniors", ATTENDANCE_SHEET_ID, get_junior_members_with_fees)
    member_names = []
    if adults_data:
        member_names.extend(name for name, _, _ in adults_data[0])
    if juniors_data:
        member_names.extend(name for name, _, _ in juniors_data[0])

    vm = build_payments_view_model(
        transactions, member_names,
        attendance_url=attendance_url,
        payments_url=payments_url,
    )
    record_step("process_data")
    return render_template("payments.html", **vm)

@app.route("/qr")
def qr_code():
    account = request.args.get("account", BANK_ACCOUNT)
    amount = request.args.get("amount", "0")
    message = request.args.get("message", "")

    # Validate account: allow IBAN (letters+digits) or Czech format (digits/digits)
    if not re.match(r'^[A-Z]{2}\d{2,34}$|^\d{1,16}/\d{4}$', account):
        account = BANK_ACCOUNT

    # QR Platba standard: SPD*1.0*ACC:accountNumber*BC:bankCode*AM:amount*CC:CZK*MSG:message
    acc_parts = account.split('/')
    if len(acc_parts) == 2:
        acc_str = f"{acc_parts[0]}*BC:{acc_parts[1]}"
    else:
        acc_str = account

    try:
        amt_val = float(amount)
        if amt_val < 0 or amt_val > 10_000_000:
            amt_val = 0
        amt_str = f"{amt_val:.2f}"
    except ValueError:
        amt_str = "0.00"

    # Message max 60 characters, strip SPD delimiters to prevent injection
    msg_str = message[:60].replace("*", "")
    
    qr_data = f"SPD*1.0*ACC:{acc_str}*AM:{amt_str}*CC:CZK*MSG:{msg_str}"
    
    img = qrcode.make(qr_data)
    buf = io.BytesIO()
    img.save(buf, format='PNG')
    buf.seek(0)
    
    return send_file(buf, mimetype='image/png')

if __name__ == "__main__":
    app.run(debug=True, host='0.0.0.0', port=5001)