package solutions.tretter.githugandroid

/**
 * Port of the upstream ruby-githug `find_old_branch` 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 findOldBranchLevel(): Level = level(
    id = "find_old_branch",
    title = "Find Old Branch",
    description = "You have been working on a branch but got distracted by a major issue. Switch back to that branch even though you forgot the name of it.",
    hints = listOf("Ever played with the `git reflog` command?"),
    commandSuggestions = listOf("git checkout solve_world_hunger"),
    setup = {
        RepoState(
            initialized = true,
            headBranch = "master",
            files = listOf(
                GitFile("myfile.txt", "THIS TEXT DOESN'T MATTER\n", tracked = true),
                GitFile("TODO", "FIND THE JOKER\n", tracked = true),
            ),
            branches = mapOf(
                "blowup_sun_for_ransom" to 1,
                "cure_common_cold" to 1,
                "master" to 2,
                "solve_world_hunger" to 2,
            ),
        )
    },
    nativeSetup = {
        resetFiles()
        write("myfile.txt", "THIS TEXT DOESN'T MATTER\n")
        addCommit("initial commit", "myfile.txt")
        git("branch", "blowup_sun_for_ransom")
        git("branch", "cure_common_cold")
        checkoutNew("solve_world_hunger")
        write("TODO", "FIX WORLD HUNGER\n")
        addCommit("commit todo", "TODO")
        checkout("master")
        write("TODO", "FIND THE JOKER\n")
        addCommit("commit another todo", "TODO")
        true
    },
    validator = repoPredicate { repo -> repo.headBranch == "solve_world_hunger" },
    testCases = listOf(
        levelTestCase("checkout old branch", "git checkout solve_world_hunger"),
        levelTestCase("switch old branch", "git switch solve_world_hunger"),
    ),
    setupChecks = listOf(
        levelSetupCheck(
            "upstream branch puzzle shape is present",
            "find_old_branch should start on master with upstream distractor branches and solve_world_hunger.",
        ) { repo ->
            repo.headBranch == "master" &&
                repo.branches.keys == setOf("blowup_sun_for_ransom", "cure_common_cold", "master", "solve_world_hunger")
        },
    ),
)