from flask import Blueprint, render_template, redirect, url_for, flash, request, jsonify
from jinja2_fragments import render_block
from werkzeug.security import generate_password_hash, check_password_hash
from flask_login import current_user, login_required
from extensions import db, htmx, environment
from datetime import datetime, timezone, timedelta
import json
from services import create_http_function_view_model, create_http_functions_view_model

"""
CREATE TABLE http_function_versions (
    id SERIAL PRIMARY KEY,
    http_function_id INT NOT NULL,
    script_content TEXT NOT NULL,
    version_number INT NOT NULL,
    versioned_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),

    CONSTRAINT fk_http_function_versions
        FOREIGN KEY (http_function_id)
        REFERENCES http_functions (id)
        ON DELETE CASCADE
        ON UPDATE CASCADE
);

CREATE OR REPLACE FUNCTION fn_http_functions_versioning()
RETURNS TRIGGER
LANGUAGE plpgsql
AS $$
DECLARE
    next_version INT;
BEGIN
    IF TG_OP = 'INSERT' THEN
        INSERT INTO http_functions_versions (http_function_id, script_content, version_number)
        VALUES (NEW.id, NEW.script_content, 1);

        UPDATE http_functions
           SET version_number = 1
         WHERE id = NEW.id;

        RETURN NEW;

    ELSIF TG_OP = 'UPDATE' THEN
        IF NEW.script_content IS DISTINCT FROM OLD.script_content THEN
            SELECT COALESCE(MAX(version_number), 0) + 1
              INTO next_version
              FROM http_functions_versions
             WHERE http_function_id = NEW.id;

            INSERT INTO http_functions_versions (http_function_id, script_content, version_number)
            VALUES (NEW.id, NEW.script_content, next_version);

            UPDATE http_functions
               SET version_number = next_version
             WHERE id = NEW.id;
        END IF;

        RETURN NEW;
    END IF;

    RETURN NEW;
END;
$$;

CREATE TRIGGER tr_http_functions_versioning
AFTER INSERT OR UPDATE
ON http_functions
FOR EACH ROW
EXECUTE PROCEDURE fn_http_functions_versioning();
"""

DEFAULT_SCRIPT = """async (req) => {
    console.log(`Method:${req.method}`)
    console.log(`Generating ${environment.lines} random lines...`)
    let svgContent = "";

    for (let i = 0; i < environment.lines; i++) {
        console.log(i)
        let pathD = "M2 " + Math.random() * 79;
        let circles = "";

        for (let x = 12; x <= 202; x += 10) {
            let y = Math.random() * 79
            pathD += ` L${x} ${y}`;
            circles += `<circle cx="${x}" cy="${y}" r="1"></circle>`;
        }

        let pathColor = `rgb(${Math.random() * 255}, ${Math.random() * 255}, ${Math.random() * 255})`;
        svgContent += `
            <g style="fill: ${pathColor}; stroke: ${pathColor};">
                <path d="${pathD}" fill="none" stroke="${pathColor}"></path>
                ${circles}
            </g>`;
    }

    return HtmlResponse(`<svg viewBox="0 0 204 79" preserveAspectRatio="none">${svgContent}</svg>`);
}"""

DEFAULT_ENVIRONMENT = """{
    "lines": 3
}"""

DEFAULT_PYTHON_SCRIPT = """def main(request, environment):
    print(f"Method: {request['method']}")
    return {"body": "Hello from Python!"}
"""

http = Blueprint("http", __name__)


def group_functions_by_path(functions):
    grouped = {}
    for function in functions:
        # Use the explicit path column
        full_path = function.get("path", "") or ""
        path_parts = [p for p in full_path.split("/") if p]
        
        current_level = grouped
        for part in path_parts:
            if part not in current_level:
                current_level[part] = {}
            current_level = current_level[part]
            
        function["_is_function"] = True
        current_level[function["name"]] = function
    return grouped

@http.route("/overview", methods=["GET"])
@login_required
def overview():
    user_id = current_user.id
    search_query = request.args.get("q", "")
    
    http_functions = db.get_http_functions_for_user(user_id, search_query)
    http_functions_view_model = create_http_functions_view_model(http_functions)
    grouped_functions = group_functions_by_path(http_functions_view_model)

    if request.headers.get('HX-Target') == 'function-list':
        return render_block(environment, "dashboard/http_functions/overview.html", "function_list", http_functions=grouped_functions)

    if htmx:
        return render_block(
            environment,
            "dashboard/http_functions/overview.html",
            "page",
            http_functions=grouped_functions,
            search_query=search_query
        )
    return render_template(
        "dashboard/http_functions/overview.html", 
        http_functions=grouped_functions,
        search_query=search_query
    )

@http.route("/new", methods=["GET", "POST"])
@login_required
def new():
    user_id = current_user.id
    if request.method == "GET":
        context = {
            "user_id": user_id,
            "name": "foo",
            "path": "",
            "script": DEFAULT_SCRIPT,
            "default_python_script": DEFAULT_PYTHON_SCRIPT,
            "environment_info": DEFAULT_ENVIRONMENT,
            "is_public": False,
            "log_request": True,
            "log_response": False,
            "description": "",
        }
        if htmx:
            return render_block(
                environment, "dashboard/http_functions/new.html", "page", **context
            )
        return render_template("dashboard/http_functions/new.html", **context)
    try:
        name = request.json.get("name")
        path = request.json.get("path", "")
        script_content = request.json.get("script_content")
        environment_info = request.json.get("environment_info")
        is_public = request.json.get("is_public")
        log_request = request.json.get("log_request")
        log_response = request.json.get("log_response")
        runtime = request.json.get("runtime", "node")
        description = request.json.get("description", "")

        db.create_new_http_function(
            user_id,
            name,
            path,
            script_content,
            environment_info,
            is_public,
            log_request,
            log_response,
            runtime,
            description
        )

        return (
            jsonify(
                {"status": "success", "message": "Http function created successfully"}
            ),
            200,
        )
    except Exception as e:
        print(e)
        return {"status": "error", "message": str(e)}


@http.route("/edit/<int:function_id>", methods=["POST"])
@login_required
def edit(function_id):
    try:
        user_id = current_user.id
        name = request.json.get("name")
        path = request.json.get("path", "")
        script_content = request.json.get("script_content")
        environment_info = request.json.get("environment_info")
        is_public = request.json.get("is_public")
        log_request = request.json.get("log_request")
        log_response = request.json.get("log_response")
        runtime = request.json.get("runtime", "node")
        description = request.json.get("description", "")
        commit_message = request.json.get("commit_message", "")

        updated_version = db.edit_http_function(
            user_id,
            function_id,
            name,
            path,
            script_content,
            environment_info,
            is_public,
            log_request,
            log_response,
            runtime,
            description
        )

        # Update the commit message for the newly created version
        # Note: The database trigger creates a new version after the UPDATE,
        # so we need to get the latest version number
        if commit_message:
            latest_version = db.execute(
                "SELECT MAX(version_number) as version_number FROM http_functions_versions WHERE http_function_id = %s",
                [function_id],
                one=True
            )
            if latest_version:
                db.execute(
                    "UPDATE http_functions_versions SET commit_message = %s WHERE http_function_id = %s AND version_number = %s",
                    [commit_message, function_id, latest_version['version_number']],
                    commit=True
                )

        return {"status": "success", "message": f"{name} updated"}
    except Exception as e:
        print(e)
        return {"status": "error", "message": str(e)}


@http.route("/delete/<int:function_id>", methods=["DELETE"])
@login_required
def delete(function_id):
    try:
        user_id = current_user.id

        db.execute(
            "DELETE FROM http_functions WHERE user_id=%s AND id=%s",
            [user_id, function_id],
            commit=True,
        )

        return {"status": "success", "message": f"Function deleted"}
    except Exception as e:
        return jsonify({"status": "error", "message": str(e)}), 500


@http.route("/logs/<int:function_id>", methods=["GET"])
@login_required
def logs(function_id):
    user_id = current_user.id
    http_function = db.get_http_function_by_id(user_id, function_id)
    if not http_function:
        return jsonify({"error": "Function not found"}), 404
    name = http_function["name"]
    http_function_invocations = db.get_http_function_invocations(function_id)
    if htmx:
        return render_block(
            environment,
            "dashboard/http_functions/logs.html",
            "page",
            user_id=user_id,
            function_id=function_id,
            name=name,
            http_function_invocations=http_function_invocations,
        )
    return render_template(
        "dashboard/http_functions/logs.html",
        user_id=user_id,
        name=name,
        function_id=function_id,
        http_function_invocations=http_function_invocations,
    )


@http.route("/client/<int:function_id>", methods=["GET"])
@login_required
def client(function_id):
    user_id = current_user.id
    http_function = db.get_http_function_by_id(user_id, function_id)
    if not http_function:
        return jsonify({"error": "Function not found"}), 404

    http_function = create_http_function_view_model(http_function)
    if htmx:
        return render_block(
            environment,
            "dashboard/http_functions/client.html",
            "page",
            function_id=function_id,
            **http_function,
        )
    return render_template(
        "dashboard/http_functions/client.html", function_id=function_id, **http_function
    )


@http.route("/history/<int:function_id>")
@login_required
def history(function_id):
    # Fetch the http function to verify ownership
    http_function = db.execute(
        """
        SELECT id, name, script_content AS code, version_number, runtime
        FROM http_functions 
        WHERE id = %s AND user_id = %s
    """,
        [function_id, current_user.id],
        one=True,
    )

    if not http_function:
        flash("Http function not found", "error")
        return redirect(url_for("http.overview"))

    # Fetch all versions
    versions = db.execute(
        """
        SELECT version_number, script_content AS script, updated_at AS versioned_at, commit_message
        FROM http_functions_versions
        WHERE http_function_id = %s
        ORDER BY version_number DESC
    """,
        [function_id],
    )

    # Convert datetime objects to ISO format strings
    for version in versions:
        version["versioned_at"] = (
            version["versioned_at"].isoformat() if version["versioned_at"] else None
        )

    args = {
        "user_id": current_user.id,
        "function_id": function_id,
        "http_function": http_function,
        "versions": versions,
        "runtime": http_function.get("runtime", "node"),
    }

    if htmx:
        return render_block(
            environment, "dashboard/http_functions/history.html", "page", **args
        )
    return render_template("dashboard/http_functions/history.html", **args)



@http.route("/editor/<int:function_id>", methods=["GET"])
@login_required
def editor(function_id):
    user_id = current_user.id
    http_function = db.get_http_function_by_id(user_id, function_id)
    if not http_function:
        return jsonify({"error": "Function not found"}), 404

    # Create a view model with all necessary data for the editor
    editor_data = {
        "id": http_function["id"],
        "name": http_function["name"],
        "path": http_function.get("path", ""),
        "script_content": http_function["script_content"],
        "environment_info": json.dumps(http_function["environment_info"], indent=2),
        "is_public": http_function["is_public"],
        "log_request": http_function["log_request"],
        "log_response": http_function["log_response"],
        "version_number": http_function["version_number"],
        "runtime": http_function.get("runtime", "node"),
        "description": http_function.get("description", ""),
        "user_id": user_id,
        "function_id": function_id,
        # Add new URLs for navigation
        "cancel_url": url_for("http.overview"),
        "edit_url": url_for("http.editor", function_id=function_id),
    }

    if htmx:
        return render_block(
            environment, "dashboard/http_functions/editor.html", "page", **editor_data
        )

    return render_template("dashboard/http_functions/editor.html", **editor_data)


@http.route("/restore/<int:function_id>", methods=["POST"])
@login_required
def restore(function_id):
    try:
        user_id = current_user.id
        version_number = request.json.get("version_number")

        if not version_number:
             return jsonify({"status": "error", "message": "Version number is required"}), 400
        
        # Verify ownership and existence of the function
        http_function = db.execute(
            "SELECT id FROM http_functions WHERE id = %s AND user_id = %s",
            [function_id, user_id],
            one=True
        )
        if not http_function:
            return jsonify({"status": "error", "message": "Function not found"}), 404

        # Fetch the content of the selected version
        version_data = db.execute(
            "SELECT script_content FROM http_functions_versions WHERE http_function_id = %s AND version_number = %s",
            [function_id, version_number],
            one=True
        )
        
        if not version_data:
            return jsonify({"status": "error", "message": "Version not found"}), 404

        # Update the function with the old script content
        # This will trigger the database function to create a new version entry
        db.execute(
            "UPDATE http_functions SET script_content = %s WHERE id = %s",
            [version_data["script_content"], function_id],
            commit=True
        )

        return jsonify({"status": "success", "message": f"Restored to version {version_number}"})

    except Exception as e:
        print(e)
        return jsonify({"status": "error", "message": str(e)}), 500