# frozen_string_literal: true

require "test_helper"

# End-to-end smoke test of the gem's public surface. Validates that the
# headline `client.stream(...)` API + Reply::Result + error model + the
# pluggable Instrumentation adapter all work against a fully mocked
# OpenCode server. This is the test we'd point at in the README to
# prove the postcard works.
class SmokeTest < Minitest::Test
  BASE = "http://opencode.test"
  PASSWORD = "test-secret"
  SESSION_ID = "ses_smoke_1"
  CONNECTED_EVENT = { type: "server.connected", properties: {} }.freeze

  def setup
    @client = Opencode::Client.new(
      base_url: BASE,
      password: PASSWORD,
      timeout: 5
    )
    Opencode::Instrumentation.adapter = nil
  end

  def test_VERSION_is_a_string
    assert_kind_of String, Opencode::VERSION
    assert_match(/\A\d+\.\d+\.\d+/, Opencode::VERSION)
  end

  def test_constants_are_loaded
    assert_equal "Opencode::Client", Opencode::Client.name
    assert_equal "Opencode::Reply", Opencode::Reply.name
    assert_equal "Opencode::Reply::Result", Opencode::Reply::Result.name
    assert_equal "Opencode::Error", Opencode::Error.name
    assert Opencode::ConnectionError < Opencode::Error
  end

  def test_health_endpoint_round_trip
    stub_request(:get, "#{BASE}/global/health")
      .to_return(status: 200, body: { healthy: true, version: "1.15.5" }.to_json,
                 headers: { "Content-Type" => "application/json" })

    response = @client.health
    assert_equal true, response[:healthy]
    assert_equal "1.15.5", response[:version]
  end

  def test_create_session_returns_session_id
    stub_request(:post, "#{BASE}/session")
      .with(body: { title: "smoke", permission: [] }.to_json)
      .to_return(status: 200, body: { id: SESSION_ID, title: "smoke" }.to_json,
                 headers: { "Content-Type" => "application/json" })

    response = @client.create_session(title: "smoke", permissions: [])
    assert_equal SESSION_ID, response[:id]
  end

  def test_create_session_sends_native_child_and_configuration_fields
    permissions = [ { permission: "skill", pattern: "*", action: "deny" } ]
    expected_body = {
      title: "curator",
      permission: permissions,
      parentID: "ses_parent",
      agent: "destination-list-curator",
      model: { providerID: "openrouter", id: "anthropic/claude-sonnet-4" },
      metadata: { run: "9" },
      workspaceID: "wrk_1"
    }

    stub_request(:post, "#{BASE}/session")
      .with(body: expected_body.to_json)
      .to_return(status: 200, body: { id: SESSION_ID }.to_json,
                 headers: { "Content-Type" => "application/json" })

    response = @client.create_session(
      title: "curator",
      permissions: permissions,
      parent_id: "ses_parent",
      agent: "destination-list-curator",
      model: "openrouter/anthropic/claude-sonnet-4",
      metadata: { run: "9" },
      workspace_id: "wrk_1"
    )

    assert_equal SESSION_ID, response[:id]
    assert_requested :post, "#{BASE}/session", body: expected_body.to_json, times: 1
  end

  def test_create_session_preserves_a_preformatted_model
    model = { providerID: "openai", id: "gpt-5.5", variant: "high" }

    stub_request(:post, "#{BASE}/session")
      .with(body: { model: model }.to_json)
      .to_return(status: 200, body: { id: SESSION_ID }.to_json,
                 headers: { "Content-Type" => "application/json" })

    response = @client.create_session(model: model)

    assert_equal SESSION_ID, response[:id]
    assert_requested :post, "#{BASE}/session", body: { model: model }.to_json, times: 1
  end

  def test_update_session_patches_permissions_and_returns_the_updated_session
    permissions = [
      { permission: "skill", pattern: "*", action: "deny" },
      { permission: "skill", pattern: "core-details", action: "allow" }
    ]

    stub_request(:patch, "#{BASE}/session/#{SESSION_ID}")
      .with(body: { permission: permissions }.to_json)
      .to_return(status: 200, body: { id: SESSION_ID, permission: permissions }.to_json,
                 headers: { "Content-Type" => "application/json" })

    response = @client.update_session(SESSION_ID, permissions: permissions)

    assert_equal SESSION_ID, response[:id]
    assert_equal permissions, response[:permission]
    assert_requested :patch, "#{BASE}/session/#{SESSION_ID}", times: 1
  end

  def test_send_message_async_returns_empty_body
    stub_request(:post, "#{BASE}/session/#{SESSION_ID}/prompt_async")
      .to_return(status: 204, body: "")

    response = @client.send_message_async(SESSION_ID, "ping")
    assert_equal({}, response)
  end

  def test_stream_returns_typed_Reply_Result_with_full_text
    stub_request(:post, "#{BASE}/session/#{SESSION_ID}/prompt_async")
      .to_return(status: 204, body: "")

    sse = [
      CONNECTED_EVENT,
      { type: "message.part.delta",
        properties: { sessionID: SESSION_ID, partID: "p1", field: "text", delta: "hello " } },
      { type: "message.part.delta",
        properties: { sessionID: SESSION_ID, partID: "p1", field: "text", delta: "world" } },
      { type: "session.status", properties: { sessionID: SESSION_ID, status: { type: "idle" } } }
    ].map { |e| "data: #{e.to_json}\n\n" }.join

    stub_request(:get, %r{#{Regexp.escape(BASE)}/event(\?.*)?\z})
      .to_return(status: 200, body: sse,
                 headers: { "Content-Type" => "text/event-stream" })

    stub_request(:get, "#{BASE}/session/#{SESSION_ID}/message")
      .to_return(status: 200, body: [].to_json,
                 headers: { "Content-Type" => "application/json" })

    parts_yielded = []
    reply = @client.stream(SESSION_ID, "ping") do |part|
      parts_yielded << part.dup
    end

    assert_kind_of Opencode::Reply::Result, reply
    assert_equal "hello world", reply.full_text
    # Struct value object supports both message and hash style access.
    assert_equal "hello world", reply[:full_text]
    refute_empty parts_yielded
  end

  def test_stream_waits_for_server_connected_before_posting_the_prompt
    request_order = []
    connection_count = 0
    terminal_event = {
      type: "session.status",
      properties: { sessionID: SESSION_ID, status: { type: "idle" } }
    }

    stub_request(:get, %r{#{Regexp.escape(BASE)}/event(\?.*)?\z})
      .to_return do
        connection_count += 1
        request_order << :sse_accepted
        events = if connection_count == 1
          [ { type: "server.heartbeat", properties: {} } ]
        else
          [ CONNECTED_EVENT, terminal_event ]
        end
        {
          status: 200,
          body: events.map { |event| "data: #{event.to_json}\n\n" }.join,
          headers: { "Content-Type" => "text/event-stream" }
        }
      end

    stub_request(:post, "#{BASE}/session/#{SESSION_ID}/prompt_async")
      .to_return do
        request_order << :prompt
        { status: 204, body: "" }
      end

    stub_request(:get, "#{BASE}/session/#{SESSION_ID}/message")
      .to_return(status: 200, body: [].to_json,
                 headers: { "Content-Type" => "application/json" })

    @client.stream(SESSION_ID, "ping", stream_timeout: 1, first_event_timeout: 1)

    assert_equal [ :sse_accepted, :sse_accepted, :prompt ], request_order
  end

  def test_stream_does_not_post_when_sse_subscription_is_rejected
    stub_request(:get, %r{#{Regexp.escape(BASE)}/event(\?.*)?\z})
      .to_return(status: 503, body: "unavailable")
    prompt = stub_request(:post, "#{BASE}/session/#{SESSION_ID}/prompt_async")
      .to_return(status: 204, body: "")

    error = assert_raises(Opencode::ServerError) do
      @client.stream(SESSION_ID, "ping", stream_timeout: 1, first_event_timeout: 1)
    end

    assert_match "SSE connection failed: HTTP 503", error.message
    assert_not_requested prompt
  end

  def test_stream_surfaces_prompt_timeout_without_reconnecting
    event_stream = stub_request(:get, %r{#{Regexp.escape(BASE)}/event(\?.*)?\z})
      .to_return(status: 200, body: "data: #{CONNECTED_EVENT.to_json}\n\n",
                 headers: { "Content-Type" => "text/event-stream" })
    prompt = stub_request(:post, "#{BASE}/session/#{SESSION_ID}/prompt_async")
      .to_raise(Net::ReadTimeout.new("prompt timed out"))

    error = assert_raises(Opencode::TimeoutError) do
      @client.stream(SESSION_ID, "ping", stream_timeout: 1, first_event_timeout: 1)
    end

    assert_match "OpenCode timeout after 5s", error.message
    assert_requested event_stream, times: 1
    assert_requested prompt, times: 1
  end

  def test_stream_reconnects_without_reposting_the_prompt
    first_connection = [
      CONNECTED_EVENT,
      { type: "server.heartbeat", properties: {} }
    ]
    second_connection = [
      CONNECTED_EVENT,
      {
        type: "message.part.delta",
        properties: { sessionID: SESSION_ID, partID: "p1", field: "text", delta: "once" }
      },
      {
        type: "session.status",
        properties: { sessionID: SESSION_ID, status: { type: "idle" } }
      }
    ]

    event_stream = stub_request(:get, %r{#{Regexp.escape(BASE)}/event(\?.*)?\z})
      .to_return(
        {
          status: 200,
          body: first_connection.map { |event| "data: #{event.to_json}\n\n" }.join,
          headers: { "Content-Type" => "text/event-stream" }
        },
        {
          status: 200,
          body: second_connection.map { |event| "data: #{event.to_json}\n\n" }.join,
          headers: { "Content-Type" => "text/event-stream" }
        }
      )
    prompt = stub_request(:post, "#{BASE}/session/#{SESSION_ID}/prompt_async")
      .to_return(status: 204, body: "")
    stub_request(:get, "#{BASE}/session/#{SESSION_ID}/message")
      .to_return(status: 200, body: [].to_json,
                 headers: { "Content-Type" => "application/json" })

    reply = @client.stream(SESSION_ID, "ping", stream_timeout: 1, first_event_timeout: 1)

    assert_equal "once", reply.full_text
    assert_requested event_stream, times: 2
    assert_requested prompt, times: 1
  end

  def test_stream_events_preserves_question_and_permission_wait_state
    events = [
      {
        type: "question.asked",
        properties: { id: "que_1", sessionID: SESSION_ID, questions: [] }
      },
      {
        type: "question.replied",
        properties: { requestID: "que_1", sessionID: SESSION_ID, answers: [ [ "yes" ] ] }
      },
      {
        type: "permission.asked",
        properties: { id: "per_1", sessionID: SESSION_ID, permission: "bash" }
      },
      {
        type: "permission.replied",
        properties: { requestID: "per_1", sessionID: SESSION_ID, reply: "once" }
      },
      {
        type: "session.status",
        properties: { sessionID: SESSION_ID, status: { type: "idle" } }
      }
    ]
    stub_request(:get, %r{#{Regexp.escape(BASE)}/event(\?.*)?\z})
      .to_return(
        status: 200,
        body: events.map { |event| "data: #{event.to_json}\n\n" }.join,
        headers: { "Content-Type" => "text/event-stream" }
      )

    reply = Opencode::Reply.new
    wait_states = []
    @client.stream_events(session_id: SESSION_ID, reply: reply) do |event|
      reply.apply(event)
      wait_states << reply.prompt_blocked?
    end

    assert_equal [ true, false, true, false, false ], wait_states
  end

  def test_stream_block_is_optional
    stub_request(:post, "#{BASE}/session/#{SESSION_ID}/prompt_async")
      .to_return(status: 204, body: "")

    sse = [
      CONNECTED_EVENT,
      { type: "message.part.delta",
        properties: { sessionID: SESSION_ID, partID: "p1", field: "text", delta: "ack" } },
      { type: "session.idle", properties: { sessionID: SESSION_ID } }
    ].map { |e| "data: #{e.to_json}\n\n" }.join

    stub_request(:get, %r{#{Regexp.escape(BASE)}/event(\?.*)?\z})
      .to_return(status: 200, body: sse,
                 headers: { "Content-Type" => "text/event-stream" })

    stub_request(:get, "#{BASE}/session/#{SESSION_ID}/message")
      .to_return(status: 200, body: [].to_json,
                 headers: { "Content-Type" => "application/json" })

    reply = @client.stream(SESSION_ID, "ping")
    assert_equal "ack", reply.full_text
  end

  def test_stream_merges_a_multi_assistant_tool_loop_without_duplicate_text
    stub_request(:post, "#{BASE}/session/#{SESSION_ID}/prompt_async")
      .to_return(status: 204, body: "")

    skill_part = {
      id: "p_skill", sessionID: SESSION_ID, messageID: "m_skill",
      type: "tool", tool: "skill", callID: "call_skill",
      state: { status: "completed", input: { name: "travelwolf-itinerary" }, output: "loaded" }
    }
    task_part = {
      id: "p_task", sessionID: SESSION_ID, messageID: "m_task",
      type: "tool", tool: "task", callID: "call_task",
      state: {
        status: "completed",
        input: { subagent_type: "itinerary-planner" },
        output: "{\"days\":[]}",
        metadata: { sessionId: "ses_child" }
      }
    }
    sse = [
      CONNECTED_EVENT,
      { type: "todo.updated", properties: { sessionID: SESSION_ID, todos: [] } },
      { type: "message.part.updated", properties: { sessionID: SESSION_ID, part: skill_part } },
      { type: "message.part.updated", properties: { sessionID: SESSION_ID, part: task_part } },
      { type: "message.part.delta",
        properties: { sessionID: SESSION_ID, partID: "p_text", field: "text", delta: "SUBAGENT_OK" } },
      { type: "message.part.delta",
        properties: { sessionID: SESSION_ID, partID: "p_text_replay", field: "text", delta: "SUBAGENT_OK" } },
      { type: "session.status", properties: { sessionID: SESSION_ID, status: { type: "idle" } } }
    ].map { |event| "data: #{event.to_json}\n\n" }.join

    stub_request(:get, %r{#{Regexp.escape(BASE)}/event(\?.*)?\z})
      .to_return(status: 200, body: sse,
                 headers: { "Content-Type" => "text/event-stream" })

    exchange = [
      { info: { role: "user" }, parts: [ { type: "text", text: "previous" } ] },
      { info: { role: "assistant" }, parts: [ { type: "text", text: "previous answer" } ] },
      { info: { role: "user" }, parts: [ { type: "text", text: "plan" } ] },
      { info: { role: "assistant" }, parts: [ skill_part ] },
      { info: { role: "assistant" }, parts: [ task_part ] },
      { info: { role: "assistant" }, parts: [ { type: "text", text: "SUBAGENT_OK" } ] }
    ]
    stub_request(:get, "#{BASE}/session/#{SESSION_ID}/message")
      .to_return(status: 200, body: exchange.to_json,
                 headers: { "Content-Type" => "application/json" })

    reply = @client.stream(SESSION_ID, "plan", stream_timeout: 1)

    assert_equal "SUBAGENT_OK", reply.full_text
    assert_equal %w[todowrite skill task], reply.tool_parts.map { |part| part.fetch("tool") }
    assert_equal "ses_child", reply.tool_parts.last.dig("metadata", "sessionId")
  end

  def test_connection_refused_raises_ConnectionError
    stub_request(:get, "http://opencode.dead/global/health")
      .to_raise(Errno::ECONNREFUSED)

    bad = Opencode::Client.new(base_url: "http://opencode.dead", timeout: 1)
    assert_raises(Opencode::ConnectionError) { bad.health }
  end

  def test_404_on_session_endpoint_raises_SessionNotFoundError
    stub_request(:get, "#{BASE}/session/missing/message")
      .to_return(status: 404, body: { error: "not found" }.to_json,
                 headers: { "Content-Type" => "application/json" })

    assert_raises(Opencode::SessionNotFoundError) do
      @client.get_messages("missing")
    end
  end

  def test_instrumentation_adapter_receives_request_events
    events = []
    Opencode::Instrumentation.adapter = ->(name, payload, &block) {
      events << [ name, payload ]
      block.call
    }

    stub_request(:get, "#{BASE}/global/health")
      .to_return(status: 200, body: "{}",
                 headers: { "Content-Type" => "application/json" })

    @client.health
    assert events.any? { |name, _| name == "opencode.request" },
      "instrumentation adapter must receive opencode.request events"
  end

  def test_Reply_distill_returns_typed_Result
    parts = [
      { "type" => "text",     "content" => "hi" },
      { "type" => "text",     "content" => "there" },
      { "type" => "tool",     "tool" => "read", "status" => "completed" }
    ]
    result = Opencode::Reply.distill(parts)

    assert_kind_of Opencode::Reply::Result, result
    assert_equal "hi\n\nthere", result.full_text
    assert_equal 1, result.tool_parts.size
  end

  def test_Instrumentation_no_op_default_yields_block_value
    Opencode::Instrumentation.adapter = nil
    assert_equal 42, Opencode::Instrumentation.instrument("x") { 42 }
  end

  def test_Instrumentation_notify_no_op_without_adapter
    Opencode::Instrumentation.adapter = nil
    # Must not raise; must return nil.
    assert_nil Opencode::Instrumentation.notify("x", foo: 1)
  end

  def test_Instrumentation_notify_forwards_to_adapter_fire_and_forget
    events = []
    Opencode::Instrumentation.adapter = ->(name, payload, &block) {
      # block_given? is misleading inside a lambda — check the captured
      # &block instead. AS::Notifications-shaped adapters always
      # expect a block (it's what marks "event finished").
      events << [ name, payload, !block.nil? ]
      block.call if block
      :adapter_return_ignored
    }

    result = Opencode::Instrumentation.notify("opencode.session.recreated", session_id: "ses_1")

    # notify is fire-and-forget — it returns nil, NOT the adapter's
    # return value (that's what .instrument does).
    assert_nil result
    assert_equal 1, events.size
    name, payload, had_block = events.first
    assert_equal "opencode.session.recreated", name
    assert_equal({ session_id: "ses_1" }, payload)
    assert had_block,
      "notify must still pass an empty block — AS::Notifications-shaped " \
      "adapters always expect one"
  end

  def test_Instrumentation_notify_does_not_require_block
    Opencode::Instrumentation.adapter = ->(_name, _payload, &_block) { }
    # Call site has no block — that's the whole point of notify.
    Opencode::Instrumentation.notify("opencode.test", k: "v")
    # If we got here without raising, the API is fire-and-forget as designed.
    assert true
  end
end