"""
Main entry point: builds a clash-free dummy schedule and renders all five
timetable views (batch/department/room/student/teacher -wise) as .xlsx
files under result/templates/<view>/.

Run:
    python app/template_generator.py
"""

import os
import shutil
import sys

APP_DIR = os.path.dirname(os.path.abspath(__file__))
ROOT_DIR = os.path.dirname(APP_DIR)

sys.path.insert(0, APP_DIR)
sys.path.insert(0, os.path.join(ROOT_DIR, "controller"))
sys.path.insert(0, os.path.join(ROOT_DIR, "templates", "batch-wise"))
sys.path.insert(0, os.path.join(ROOT_DIR, "templates", "department-wise"))
sys.path.insert(0, os.path.join(ROOT_DIR, "templates", "room-wise"))
sys.path.insert(0, os.path.join(ROOT_DIR, "templates", "student-wise"))
sys.path.insert(0, os.path.join(ROOT_DIR, "templates", "teacher-wise"))

from template_controller import build_schedule  # noqa: E402
from conflict_checker import check_all_conflicts  # noqa: E402
from conflict_checker.student_conflict_checker import format_student_conflicts  # noqa: E402
from conflict_checker.teacher_conflict_checker import format_teacher_conflicts  # noqa: E402
from template_logger import reset_log, log_error, log_info  # noqa: E402

from batch_wise_template import generate_batch_wise_templates  # noqa: E402
from department_wise_template import generate_department_wise_templates  # noqa: E402
from room_wise_template import generate_room_wise_templates  # noqa: E402
from student_wise_template import generate_student_wise_templates  # noqa: E402
from teacher_wise_template import generate_teacher_wise_templates  # noqa: E402

RESULT_DIR = os.path.join(ROOT_DIR, "result", "templates")
VIEW_NAMES = ["batch-wise", "department-wise", "room-wise", "student-wise", "teacher-wise"]


def clear_result_dir():
    """Removes every previous run's output so stale files never linger."""
    for view_name in VIEW_NAMES:
        output_dir = os.path.join(RESULT_DIR, view_name)
        if os.path.exists(output_dir):
            shutil.rmtree(output_dir)
        os.makedirs(output_dir, exist_ok=True)


def main():
    reset_log()
    clear_result_dir()

    data_csv_marker = os.path.join(ROOT_DIR, "data", "dummy", "blocks", "rooms.csv")
    if not os.path.exists(data_csv_marker):
        print("Dummy data not found — generating it first...")
        sys.path.insert(0, os.path.join(ROOT_DIR, "data", "dummy"))
        from generate_dummy_data import main as generate_dummy_data
        generate_dummy_data()
        print()

    print("Loading data and building clash-free schedule...")
    data, sessions = build_schedule()
    print(f"Scheduled {len(sessions)} sessions.\n")

    log_info("Running conflict checks (student/batch and teacher)...")
    report = check_all_conflicts(sessions)
    if report["has_conflicts"]:
        for line in format_student_conflicts(report["student_conflicts"]):
            log_error(f"STUDENT CONFLICT: {line}")
        for line in format_teacher_conflicts(report["teacher_conflicts"]):
            log_error(f"TEACHER CONFLICT: {line}")
        log_error(
            f"Found {len(report['student_conflicts'])} student conflict(s) and "
            f"{len(report['teacher_conflicts'])} teacher conflict(s)."
        )
    else:
        log_info("No conflicts found — schedule is clash-free for students and teachers.")

    generators = [
        ("batch-wise", generate_batch_wise_templates),
        ("department-wise", generate_department_wise_templates),
        ("room-wise", generate_room_wise_templates),
        ("student-wise", generate_student_wise_templates),
        ("teacher-wise", generate_teacher_wise_templates),
    ]

    total_files = 0
    for view_name, generate_fn in generators:
        output_dir = os.path.join(RESULT_DIR, view_name)
        written = generate_fn(sessions, data, output_dir)
        total_files += len(written)
        print(f"[{view_name}] generated {len(written)} file(s) -> {output_dir}")

    print(f"\nDone. {total_files} timetable file(s) written under {RESULT_DIR}")


if __name__ == "__main__":
    main()