import json
import os
import sys
from pathlib import Path

import jsonschema
import pytest

sys.path.insert(0, str(Path(__file__).resolve().parent.parent))

from adapters.terraform.adapter import (
    TYPE_MAP, INPUT_MAP, OUTPUT_MAP, adapt, _tf_value, _ref_expr,
)

ROOT = Path(__file__).resolve().parent.parent


class TestInstance:
    def test_instance_validates_against_stack_schema(self, stack_instance, stack_schema):
        jsonschema.validate(stack_instance, stack_schema)

    def test_instance_has_one_resource(self, stack_instance):
        assert len(stack_instance["resources"]) == 1
        r = stack_instance["resources"][0]
        assert r["id"] == "s3"
        assert r["type"] == "aws:s3:bucket"

    def test_instance_stack_is_s3(self, stack_instance):
        assert stack_instance["stack"]["name"] == "s3"
        assert stack_instance["stack"]["kind"] == "l1"


class TestRegistry:
    EXPECTED_L1_KEYS = {"s3", "vpc", "ecs-cluster", "ecs-service", "iam-role", "alb", "ecr", "cloudfront", "waf"}
    EXPECTED_L2_KEYS = {"static-assets", "microservice"}

    def test_registry_has_11_entries(self, registry):
        assert len(registry) == 11
        assert set(registry.keys()) == (self.EXPECTED_L1_KEYS | self.EXPECTED_L2_KEYS)

    def test_registry_has_9_l1_entries(self, registry):
        l1 = {k for k in registry if registry[k]["1.0.0"]["interface"].startswith("modules/l1/")}
        assert l1 == self.EXPECTED_L1_KEYS

    def test_registry_has_2_l2_entries(self, registry):
        l2 = {k for k in registry if registry[k]["1.0.0"]["interface"].startswith("modules/l2/")}
        assert l2 == self.EXPECTED_L2_KEYS

    def test_all_l1_interfaces_exist(self, registry, repo_root):
        for name in self.EXPECTED_L1_KEYS:
            entry = registry[name]["1.0.0"]
            iface_path = os.path.join(repo_root, entry["interface"])
            assert os.path.isfile(iface_path), f"{iface_path} missing"
            iface = json.load(open(iface_path))
            assert iface["name"] == name


class TestTypeMap:
    def test_s3_in_type_map(self):
        assert TYPE_MAP["aws:s3:bucket"] == "aws_s3_bucket"

    def test_vpc_types_in_type_map(self):
        assert TYPE_MAP["aws:ec2:vpc"] == "aws_vpc"
        assert TYPE_MAP["aws:ec2:subnet"] == "aws_subnet"
        assert TYPE_MAP["aws:ec2:routetable"] == "aws_route_table"

    def test_ecs_types_in_type_map(self):
        assert TYPE_MAP["aws:ecs:cluster"] == "aws_ecs_cluster"
        assert TYPE_MAP["aws:ecs:task_definition"] == "aws_ecs_task_definition"
        assert TYPE_MAP["aws:ecs:service"] == "aws_ecs_service"

    def test_alb_types_in_type_map(self):
        assert TYPE_MAP["aws:elbv2:loadbalancer"] == "aws_lb"
        assert TYPE_MAP["aws:elbv2:listener"] == "aws_lb_listener"
        assert TYPE_MAP["aws:elbv2:targetgroup"] == "aws_lb_target_group"

    def test_iam_and_ecr_in_type_map(self):
        assert TYPE_MAP["aws:iam:role"] == "aws_iam_role"
        assert TYPE_MAP["aws:ecr:repository"] == "aws_ecr_repository"

    def test_cloudfront_types_in_type_map(self):
        assert TYPE_MAP["aws:cloudfront:distribution"] == "aws_cloudfront_distribution"
        assert TYPE_MAP["aws:cloudfront:originaccesscontrol"] == "aws_cloudfront_origin_access_control"

    def test_waf_type_in_type_map(self):
        assert TYPE_MAP["aws:wafv2:webacl"] == "aws_wafv2_web_acl"


class TestTfValue:
    def test_string_quoted(self):
        assert _tf_value("hello") == '"hello"'

    def test_bool_true(self):
        assert _tf_value(True) == "true"

    def test_bool_false(self):
        assert _tf_value(False) == "false"

    def test_int(self):
        assert _tf_value(42) == "42"

    def test_float(self):
        assert _tf_value(3.14) == "3.14"

    def test_dict_jsonencoded(self):
        result = _tf_value({"key": "val"})
        assert "jsonencode" in result
        assert '"key"' in result

    def test_list_jsonencoded(self):
        result = _tf_value([1, 2])
        assert "jsonencode" in result

    def test_json_string_jsonencoded(self):
        result = _tf_value('{"k":"v"}')
        assert "jsonencode" in result

    def test_ref_raises(self):
        with pytest.raises(ValueError, match="ref: values"):
            _tf_value("ref:s3.bucket_arn")


class TestRefExpr:
    def test_basic_ref(self):
        type_by_id = {"s3": "aws:s3:bucket"}
        result = _ref_expr("ref:s3.bucket_arn", type_by_id)
        assert result == "aws_s3_bucket.s3.arn"

    def test_vpc_ref(self):
        type_by_id = {"vpc": "aws:ec2:vpc"}
        result = _ref_expr("ref:vpc.vpc_id", type_by_id)
        assert result == "aws_vpc.vpc.id"

    def test_unknown_id_raises(self):
        with pytest.raises(ValueError, match="unknown stack resource id"):
            _ref_expr("ref:nonexistent.output", {"s3": "aws:s3:bucket"})


class TestAdapt:
    def test_adapt_emits_three_files(self, stack_instance, tmp_path):
        out_dir = str(tmp_path / "tf_out")
        adapt(stack_instance, out_dir)
        assert os.path.isfile(os.path.join(out_dir, "main.tf"))
        assert os.path.isfile(os.path.join(out_dir, "terraform.tf"))
        assert os.path.isfile(os.path.join(out_dir, "providers.tf"))

    def test_main_tf_has_s3_bucket(self, stack_instance, tmp_path):
        out_dir = str(tmp_path / "tf_out")
        adapt(stack_instance, out_dir)
        main_tf = open(os.path.join(out_dir, "main.tf")).read()
        assert 'resource "aws_s3_bucket" "s3"' in main_tf
        assert 'bucket = "acdl-spike-bucket"' in main_tf

    def test_main_tf_has_versioning(self, stack_instance, tmp_path):
        out_dir = str(tmp_path / "tf_out")
        adapt(stack_instance, out_dir)
        main_tf = open(os.path.join(out_dir, "main.tf")).read()
        assert "versioning" in main_tf
        assert "enabled = true" in main_tf

    def test_main_tf_has_outputs(self, stack_instance, tmp_path):
        out_dir = str(tmp_path / "tf_out")
        adapt(stack_instance, out_dir)
        main_tf = open(os.path.join(out_dir, "main.tf")).read()
        assert 'output "bucket_arn"' in main_tf
        assert 'output "bucket_name"' in main_tf

    def test_terraform_tf_has_backend(self, stack_instance, tmp_path):
        out_dir = str(tmp_path / "tf_out")
        adapt(stack_instance, out_dir)
        terraform_tf = open(os.path.join(out_dir, "terraform.tf")).read()
        assert 'backend "s3"' in terraform_tf
        assert 'required_version' in terraform_tf
        assert ">= 1.9" in terraform_tf

    def test_providers_tf_has_aws(self, stack_instance, tmp_path):
        out_dir = str(tmp_path / "tf_out")
        adapt(stack_instance, out_dir)
        providers_tf = open(os.path.join(out_dir, "providers.tf")).read()
        assert 'provider "aws"' in providers_tf
        assert "us-east-1" in providers_tf

    def test_backend_key_uses_stack_name(self, stack_instance, tmp_path):
        out_dir = str(tmp_path / "tf_out")
        adapt(stack_instance, out_dir)
        terraform_tf = open(os.path.join(out_dir, "terraform.tf")).read()
        assert "spike/s3/terraform.tfstate" in terraform_tf


class TestS3Output:
    def test_s3_instance_has_bucket_regional_domain_name_output(self, stack_instance, tmp_path):
        out_dir = str(tmp_path / "tf_out")
        adapt(stack_instance, out_dir)
        main_tf = open(os.path.join(out_dir, "main.tf")).read()
        assert 'output "bucket_regional_domain_name"' in main_tf
        assert "aws_s3_bucket.s3.bucket_regional_domain_name" in main_tf


class TestStaticAssetsStack:
    @pytest.fixture
    def static_assets_stack(self):
        from core.contract_resolver import resolve
        return resolve(str(ROOT / "contracts/static-assets.yaml"), str(ROOT))

    def test_static_assets_resolves_to_4_resources(self, static_assets_stack):
        types = [r["type"] for r in static_assets_stack["resources"]]
        assert "aws:s3:bucket" in types
        assert "aws:cloudfront:distribution" in types
        assert "aws:cloudfront:originaccesscontrol" in types
        assert "aws:wafv2:webacl" in types

    def test_static_assets_adapter_emits_all_resources(self, static_assets_stack, tmp_path):
        out_dir = str(tmp_path / "tf_out")
        adapt(static_assets_stack, out_dir)
        main_tf = open(os.path.join(out_dir, "main.tf")).read()
        assert 'resource "aws_s3_bucket" "s3"' in main_tf
        assert 'resource "aws_cloudfront_distribution" "cloudfront-distribution"' in main_tf
        assert 'resource "aws_cloudfront_origin_access_control" "cloudfront-originaccesscontrol"' in main_tf
        assert 'resource "aws_wafv2_web_acl" "waf"' in main_tf

    def test_static_assets_adapter_wires_s3_origin_to_cloudfront(self, static_assets_stack, tmp_path):
        out_dir = str(tmp_path / "tf_out")
        adapt(static_assets_stack, out_dir)
        main_tf = open(os.path.join(out_dir, "main.tf")).read()
        assert "aws_s3_bucket.s3.bucket_regional_domain_name" in main_tf
        assert "aws_cloudfront_origin_access_control.cloudfront-originaccesscontrol.id" in main_tf

    def test_static_assets_adapter_wires_waf_to_cloudfront(self, static_assets_stack, tmp_path):
        out_dir = str(tmp_path / "tf_out")
        adapt(static_assets_stack, out_dir)
        main_tf = open(os.path.join(out_dir, "main.tf")).read()
        assert "aws_wafv2_web_acl.waf.arn" in main_tf
        assert "web_acl_id = aws_wafv2_web_acl.waf.arn" in main_tf

    def test_static_assets_adapter_emits_distribution_outputs(self, static_assets_stack, tmp_path):
        out_dir = str(tmp_path / "tf_out")
        adapt(static_assets_stack, out_dir)
        main_tf = open(os.path.join(out_dir, "main.tf")).read()
        assert 'output "distribution_domain_name"' in main_tf
        assert 'output "web_acl_arn"' in main_tf