package solutions.tretter.githugandroid

/**
 * Port of the upstream ruby-githug `rebase_onto` level.
 *
 * Setup documents the repository shape the learner explores. Evaluation is kept
 * state-based whenever the exercise changes repository objects; answer-only
 * levels intentionally validate the answer entered at the prompt.
 */
internal fun rebaseOntoLevel(): Level = level(
    id = "rebase_onto",
    title = "Rebase Onto",
    description = "You have created your branch from `wrong_branch` and already made some commits, and you realise that you needed to create your branch from `master`. Rebase your commits onto `master` branch so that you don't have `wrong_branch` commits.",
    hints = listOf("You want to research the `git rebase` commands `--onto` argument"),
    commandSuggestions = listOf("git rebase --onto master wrong_branch readme-update"),
    setup = { RepoState(initialized = true, headBranch = "readme-update", branches = mapOf("master" to 1, "wrong_branch" to 2, "readme-update" to 4)) },
    nativeSetup = {
        resetFiles()
        write("authors.md", "https://github.com/janis-vitols\n")
        addCommit("Create authors file", "authors.md")
        checkoutNew("wrong_branch")
        write("authors.md", "None\n")
        addCommit("Wrong changes", "authors.md")
        checkoutNew("readme-update")
        write("README.md", "# SuperApp\n")
        addCommit("Add app name in readme", "README.md")
        append("README.md", "## About\n")
        addCommit("Add `About` header in readme", "README.md")
        append("README.md", "## Install\n")
        addCommit("Add `Install` header in readme", "README.md")
        true
    },
    validator = repoPredicate { repo ->
        repo.headBranch == "readme-update" &&
            repo.files.find { it.name == "authors.md" }?.content == "https://github.com/janis-vitols\n" &&
            repo.commits.map { it.message }.containsAll(
                listOf(
                    "Add app name in readme",
                    "Add `About` header in readme",
                    "Add `Install` header in readme",
                ),
            )
    },
    testCases = listOf(
        levelTestCase("rebase onto explicit branch", "git rebase --onto master wrong_branch readme-update"),
        levelTestCase("rebase onto current branch", "git rebase --onto master wrong_branch"),
        levelTestCase("rebase onto full branch ref", "git rebase --onto refs/heads/master wrong_branch readme-update"),
    ),
)