-- Workflow (c): follow a [[link]] under the cursor on <CR> to the target doc.

local h = require("e2e.helpers")

describe("follow link", function()
  local ctx
  before_each(function()
    ctx = h.start()
  end)
  after_each(function()
    h.stop(ctx)
  end)

  it("follows [[B]] under the cursor to doc B", function()
    local b = h.create_doc("B", "the B doc")
    local a = h.create_doc("A", "see [[B]] here")

    local buf = h.open(a.id)
    local lnum, col = h.find(buf, "%[%[B") -- the body line, below the frontmatter
    assert.is_truthy(lnum)
    -- Put the cursor on the target inside the brackets.
    vim.api.nvim_win_set_cursor(0, { lnum, col + 2 })

    require("heph.link").follow()

    local cur = vim.api.nvim_get_current_buf()
    assert.are.equal("heph://node/" .. b.id, vim.api.nvim_buf_get_name(cur))
    assert.are.equal(b.id, vim.b[cur].heph_node_id)
  end)

  it("creates the target doc when following an unresolved [[link]]", function()
    local a = h.create_doc("Daily", "see [[New Topic]]")
    local buf = h.open(a.id)
    local lnum, col = h.find(buf, "%[%[New")
    vim.api.nvim_win_set_cursor(0, { lnum, col + 2 }) -- inside [[New Topic]]

    require("heph.link").follow()

    -- A new doc titled "New Topic" was created and opened.
    local created = ctx.q:call("node.resolve", { title = "New Topic" })
    assert.is_truthy(created, "expected the target doc to be created")
    assert.are.equal("heph://node/" .. created.id, vim.api.nvim_buf_get_name(0))

    -- ...and the source now backlinks it (the wiki-link materialized).
    local linked = false
    for _, l in ipairs(ctx.q:call("links.backlinks", { id = created.id })) do
      if l.src_id == a.id and l.link_type == "wiki" then
        linked = true
      end
    end
    assert.is_true(linked, "expected the source to backlink the created doc")
  end)

  it("creates + links from an unsaved [[link]] just typed into the buffer", function()
    -- The real gesture: open a note, type a new [[link]], <CR> without :w.
    local a = h.create_doc("Journalish", "")
    local buf = h.open(a.id)
    vim.api.nvim_buf_set_lines(buf, 0, -1, false, { "ref [[Fresh Note]]" })
    assert.is_true(vim.bo[buf].modified)
    local at = vim.api.nvim_buf_get_lines(buf, 0, 1, false)[1]:find("%[%[Fresh")
    vim.api.nvim_win_set_cursor(0, { 1, at + 1 })

    require("heph.link").follow()

    local created = ctx.q:call("node.resolve", { title = "Fresh Note" })
    assert.is_truthy(created)
    assert.are.equal("heph://node/" .. created.id, vim.api.nvim_buf_get_name(0))
    -- The source's pending edit was persisted and the backlink materialized.
    assert.are.equal("ref [[Fresh Note]]", ctx.q:call("node.get", { id = a.id }).body)
    local linked = false
    for _, l in ipairs(ctx.q:call("links.backlinks", { id = created.id })) do
      if l.src_id == a.id and l.link_type == "wiki" then
        linked = true
      end
    end
    assert.is_true(linked, "expected the source edit saved and backlink materialized")
  end)
end)