import json

from flask import Blueprint, Response, redirect, render_template
from sqlalchemy import select

from l4d2web.auth import current_user, require_admin, require_login
from l4d2web.db import session_scope
from l4d2web.models import Blueprint as BlueprintModel
from l4d2web.models import BlueprintOverlay, Job, Overlay, Server, User


bp = Blueprint("pages", __name__)


@bp.get("/dashboard")
@require_login
def dashboard() -> str:
    return render_template("dashboard.html")


@bp.get("/admin")
@require_admin
def admin_home() -> str:
    return render_template("admin.html")


@bp.post("/admin/install")
@require_admin
def enqueue_runtime_install() -> Response:
    user = current_user()
    assert user is not None
    with session_scope() as db:
        db.add(Job(user_id=user.id, server_id=None, operation="install", state="queued"))
    return redirect("/admin/jobs")


@bp.get("/admin/users")
@require_admin
def admin_users() -> str:
    with session_scope() as db:
        users = db.scalars(select(User).order_by(User.username)).all()
    return render_template("admin_users.html", users=users)


@bp.get("/admin/jobs")
@require_admin
def admin_jobs() -> str:
    with session_scope() as db:
        rows = db.execute(
            select(Job, User, Server)
            .join(User, User.id == Job.user_id)
            .outerjoin(Server, Server.id == Job.server_id)
            .order_by(Job.created_at.desc())
        ).all()
    return render_template("admin_jobs.html", rows=rows)


@bp.get("/servers")
@require_login
def servers_page() -> str:
    user = current_user()
    assert user is not None
    with session_scope() as db:
        rows = db.execute(
            select(Server, BlueprintModel)
            .join(BlueprintModel, BlueprintModel.id == Server.blueprint_id)
            .where(Server.user_id == user.id)
            .order_by(Server.name)
        ).all()
    return render_template("servers.html", rows=rows)


@bp.get("/servers/<int:server_id>")
@require_login
def server_detail(server_id: int):
    user = current_user()
    assert user is not None

    with session_scope() as db:
        server = db.scalar(select(Server).where(Server.id == server_id, Server.user_id == user.id))
        if server is None:
            return Response(status=404)
        blueprint = db.scalar(select(BlueprintModel).where(BlueprintModel.id == server.blueprint_id))
        recent_job_rows = db.execute(
            select(Job, User, Server)
            .join(User, User.id == Job.user_id)
            .outerjoin(Server, Server.id == Job.server_id)
            .where(Job.server_id == server.id)
            .order_by(Job.created_at.desc())
            .limit(5)
        ).all()

    return render_template(
        "server_detail.html",
        server=server,
        blueprint=blueprint,
        recent_job_rows=recent_job_rows,
    )


@bp.get("/servers/<int:server_id>/jobs")
@require_login
def server_jobs_page(server_id: int):
    user = current_user()
    assert user is not None

    with session_scope() as db:
        server = db.scalar(select(Server).where(Server.id == server_id, Server.user_id == user.id))
        if server is None:
            return Response(status=404)
        rows = db.execute(
            select(Job, User, Server)
            .join(User, User.id == Job.user_id)
            .outerjoin(Server, Server.id == Job.server_id)
            .where(Job.server_id == server.id)
            .order_by(Job.created_at.desc())
        ).all()

    return render_template("server_jobs.html", server=server, rows=rows)


@bp.get("/overlays")
@require_login
def overlays() -> str:
    with session_scope() as db:
        overlays = db.scalars(select(Overlay).order_by(Overlay.name)).all()
    return render_template("overlays.html", overlays=overlays)


@bp.get("/blueprints")
@require_login
def blueprints_page() -> str:
    user = current_user()
    assert user is not None
    with session_scope() as db:
        blueprints = db.scalars(
            select(BlueprintModel).where(BlueprintModel.user_id == user.id).order_by(BlueprintModel.name)
        ).all()
    return render_template("blueprints.html", blueprints=blueprints)


@bp.get("/blueprints/<int:blueprint_id>")
@require_login
def blueprint_page(blueprint_id: int):
    user = current_user()
    assert user is not None

    with session_scope() as db:
        blueprint = db.scalar(select(BlueprintModel).where(BlueprintModel.id == blueprint_id))
        if blueprint is None:
            return Response(status=404)
        if blueprint.user_id != user.id:
            return Response(status=403)

        selected_overlays = db.scalars(
            select(Overlay)
            .join(BlueprintOverlay, BlueprintOverlay.overlay_id == Overlay.id)
            .where(BlueprintOverlay.blueprint_id == blueprint.id)
            .order_by(BlueprintOverlay.position)
        ).all()
        position_rows = db.execute(
            select(BlueprintOverlay.overlay_id, BlueprintOverlay.position)
            .where(BlueprintOverlay.blueprint_id == blueprint.id)
        ).all()
        all_overlays = db.scalars(select(Overlay).order_by(Overlay.name)).all()

    overlay_positions = {overlay_id: position + 1 for overlay_id, position in position_rows}
    return render_template(
        "blueprint_detail.html",
        blueprint=blueprint,
        selected_overlays=selected_overlays,
        all_overlays=all_overlays,
        selected_overlay_ids={overlay.id for overlay in selected_overlays},
        overlay_positions=overlay_positions,
        arguments=json.loads(blueprint.arguments),
        config_lines=json.loads(blueprint.config),
    )