#!/usr/bin/env pwsh
<#
.SYNOPSIS
    Verifies the Module 06 challenge solutions.

.DESCRIPTION
    Checks that all three revert scenarios have been completed correctly:
    - regular-revert: Single commit reverted
    - middle-revert: Commit in middle of history reverted
    - multi-revert: Multiple commits reverted
#>

Write-Host "`n=== Verifying Module 06: Git Revert Solutions ===" -ForegroundColor Cyan

$allChecksPassed = $true
$originalDir = Get-Location

# Check if challenge directory exists
if (-not (Test-Path "challenge")) {
    Write-Host "[FAIL] Challenge directory not found. Run setup.ps1 first." -ForegroundColor Red
    exit 1
}

Set-Location "challenge"

# Check if git repository exists
if (-not (Test-Path ".git")) {
    Write-Host "[FAIL] Not a git repository. Run setup.ps1 first." -ForegroundColor Red
    Set-Location $originalDir
    exit 1
}

# ============================================================================
# SCENARIO 1: Regular Revert Verification
# ============================================================================
Write-Host "`n=== Scenario 1: Regular Revert ===" -ForegroundColor Cyan

git switch regular-revert 2>&1 | Out-Null

if ($LASTEXITCODE -ne 0) {
    Write-Host "[FAIL] regular-revert branch not found" -ForegroundColor Red
    $allChecksPassed = $false
} else {
    # Check that a revert commit exists
    $revertCommit = git log --oneline --grep="Revert" 2>$null
    if ($revertCommit) {
        Write-Host "[PASS] Revert commit found" -ForegroundColor Green
    } else {
        Write-Host "[FAIL] No revert commit found" -ForegroundColor Red
        Write-Host "[HINT] Use: git revert <commit-hash>" -ForegroundColor Yellow
        $allChecksPassed = $false
    }

    # Check that divide.py is removed (was reverted)
    if (-not (Test-Path "divide.py")) {
        Write-Host "[PASS] Broken divide.py successfully reverted (file removed)" -ForegroundColor Green
    } else {
        Write-Host "[FAIL] divide.py still exists (should be reverted)" -ForegroundColor Red
        Write-Host "[HINT] The bad commit should be reverted, removing divide.py" -ForegroundColor Yellow
        $allChecksPassed = $false
    }

    # Check that calculator.py exists and has correct content
    if (Test-Path "calculator.py") {
        $calcContent = Get-Content "calculator.py" -Raw

        # Check that modulo function still exists (should be preserved)
        if ($calcContent -match "def modulo") {
            Write-Host "[PASS] modulo function preserved (good commit after bad one)" -ForegroundColor Green
        } else {
            Write-Host "[FAIL] modulo function missing (should still exist)" -ForegroundColor Red
            Write-Host "[HINT] Only revert the bad commit, not the good ones after it" -ForegroundColor Yellow
            $allChecksPassed = $false
        }

        # Check that multiply function exists (should be preserved)
        if ($calcContent -match "def multiply") {
            Write-Host "[PASS] multiply function preserved (good commit before bad one)" -ForegroundColor Green
        } else {
            Write-Host "[FAIL] multiply function missing" -ForegroundColor Red
            $allChecksPassed = $false
        }
    } else {
        Write-Host "[FAIL] calculator.py not found" -ForegroundColor Red
        $allChecksPassed = $false
    }
}

# ============================================================================
# SCENARIO 2: Middle Revert Verification
# ============================================================================
Write-Host "`n=== Scenario 2: Middle Revert ===" -ForegroundColor Cyan

git switch middle-revert 2>&1 | Out-Null

if ($LASTEXITCODE -ne 0) {
    Write-Host "[FAIL] middle-revert branch not found" -ForegroundColor Red
    $allChecksPassed = $false
} else {
    # Check that a revert commit exists
    $revertCommit = git log --oneline --grep="Revert" 2>$null
    if ($revertCommit) {
        Write-Host "[PASS] Revert commit found" -ForegroundColor Green
    } else {
        Write-Host "[FAIL] No revert commit found" -ForegroundColor Red
        Write-Host "[HINT] Use: git revert <commit-hash>" -ForegroundColor Yellow
        $allChecksPassed = $false
    }

    # Check that formatter.py is removed (reverted)
    if (-not (Test-Path "formatter.py")) {
        Write-Host "[PASS] Broken formatter.py successfully reverted (file removed)" -ForegroundColor Green
    } else {
        Write-Host "[FAIL] formatter.py still exists (should be reverted)" -ForegroundColor Red
        Write-Host "[HINT] The bad commit should be reverted, removing formatter.py" -ForegroundColor Yellow
        $allChecksPassed = $false
    }

    # Check that validation.py still exists (good commit before bad one)
    if (Test-Path "validation.py") {
        Write-Host "[PASS] validation.py preserved (good commit before bad one)" -ForegroundColor Green
    } else {
        Write-Host "[FAIL] validation.py missing (should still exist)" -ForegroundColor Red
        $allChecksPassed = $false
    }

    # Check that config.py still exists (good commit after bad one)
    if (Test-Path "config.py") {
        Write-Host "[PASS] config.py preserved (good commit after bad one)" -ForegroundColor Green
    } else {
        Write-Host "[FAIL] config.py missing (should still exist)" -ForegroundColor Red
        Write-Host "[HINT] Only revert the bad commit, not the good ones after it" -ForegroundColor Yellow
        $allChecksPassed = $false
    }
}

# ============================================================================
# SCENARIO 3: Multi Revert Verification
# ============================================================================
Write-Host "`n=== Scenario 3: Multi Revert ===" -ForegroundColor Cyan

git switch multi-revert 2>&1 | Out-Null

if ($LASTEXITCODE -ne 0) {
    Write-Host "[FAIL] multi-revert branch not found" -ForegroundColor Red
    $allChecksPassed = $false
} else {
    # Count revert commits
    $revertCommits = git log --oneline --grep="Revert" 2>$null
    $revertCount = ($revertCommits | Measure-Object).Count

    if ($revertCount -ge 2) {
        Write-Host "[PASS] Found $revertCount revert commits (expected at least 2)" -ForegroundColor Green
    } else {
        Write-Host "[FAIL] Found only $revertCount revert commit(s), need at least 2" -ForegroundColor Red
        Write-Host "[HINT] Revert both bad commits: git revert <commit1> <commit2>" -ForegroundColor Yellow
        $allChecksPassed = $false
    }

    # Check that sqrt.py is removed (reverted)
    if (-not (Test-Path "sqrt.py")) {
        Write-Host "[PASS] Broken sqrt.py successfully reverted (file removed)" -ForegroundColor Green
    } else {
        Write-Host "[FAIL] sqrt.py still exists (should be reverted)" -ForegroundColor Red
        $allChecksPassed = $false
    }

    # Check that logarithm.py is removed (reverted)
    if (-not (Test-Path "logarithm.py")) {
        Write-Host "[PASS] Broken logarithm.py successfully reverted (file removed)" -ForegroundColor Green
    } else {
        Write-Host "[FAIL] logarithm.py still exists (should be reverted)" -ForegroundColor Red
        $allChecksPassed = $false
    }

    # Check calculator.py content
    if (Test-Path "calculator.py") {
        $calcContent = Get-Content "calculator.py" -Raw

        # Check that power function still exists (good commit before bad ones)
        if ($calcContent -match "def power") {
            Write-Host "[PASS] power function preserved" -ForegroundColor Green
        } else {
            Write-Host "[FAIL] power function missing (should still exist)" -ForegroundColor Red
            $allChecksPassed = $false
        }

        # Check that absolute function still exists (good commit after bad ones)
        if ($calcContent -match "def absolute") {
            Write-Host "[PASS] absolute function preserved" -ForegroundColor Green
        } else {
            Write-Host "[FAIL] absolute function missing (should still exist)" -ForegroundColor Red
            $allChecksPassed = $false
        }
    } else {
        Write-Host "[FAIL] calculator.py not found" -ForegroundColor Red
        $allChecksPassed = $false
    }
}

Set-Location $originalDir

# Final summary
Write-Host ""
if ($allChecksPassed) {
    Write-Host "=========================================" -ForegroundColor Green
    Write-Host "   CONGRATULATIONS! ALL SCENARIOS PASSED!" -ForegroundColor Green
    Write-Host "=========================================" -ForegroundColor Green
    Write-Host "`nYou've mastered git revert!" -ForegroundColor Cyan
    Write-Host "You now understand:" -ForegroundColor Cyan
    Write-Host "  ✓ Reverting commits safely without erasing history" -ForegroundColor White
    Write-Host "  ✓ Reverting old commits in the middle of history" -ForegroundColor White
    Write-Host "  ✓ Reverting multiple commits at once" -ForegroundColor White
    Write-Host "  ✓ Preserving commits before and after the reverted one" -ForegroundColor White
    Write-Host "`nReady for Module 07: Git Reset!" -ForegroundColor Green
    Write-Host ""
    exit 0
} else {
    Write-Host "[SUMMARY] Some checks failed. Review the hints above and try again." -ForegroundColor Red
    Write-Host "[INFO] You can run this verification script as many times as needed." -ForegroundColor Yellow
    Write-Host ""
    exit 1
}