#!/usr/bin/env pwsh
<#
.SYNOPSIS
    Verifies the Module 04 challenge solution.

.DESCRIPTION
    This script checks that you've successfully resolved the merge conflict by:
    - Merging both branches into main
    - Resolving the conflict in config.json
    - Keeping both timeout and debug settings
    - Ensuring valid JSON syntax
#>

. "$PSScriptRoot\..\..\util.ps1"

$script:allChecksPassed = $true
$challengeRoot = "$PSScriptRoot\challenge"

Write-Host $PSScriptRoot

# ============================================================================
# Check challenge directory exists
# ============================================================================

if (-not (Test-Path $challengeRoot)) {
    Write-Error "Challenge directory not found." -ForegroundColor Red
    Write-Host "Run .\setup.ps1 first to create the challenge environment." -ForegroundColor Yellow
    exit 1
}

if (-not (Test-Path "$challengeRoot\.git")) {
    Write-Error "Not a git repository." -ForegroundColor Red
    Write-Host "Run ..\setup.ps1 first to create the challenge environment." -ForegroundColor Yellow
    exit 1
}

Write-Host "`n=== Verifying Module 04: Merge Conflicts ===" -ForegroundColor Cyan

# ============================================================================
# Detect the main branch name (could be main, master, etc.)
# ============================================================================
# Try to get the default branch from remote origin first
$mainBranch = Get-MainBranch
Write-Host "Detected main branch: $mainBranch" -ForegroundColor Cyan

# ============================================================================
# Check current branch
# ============================================================================
$currentBranch = git branch --show-current 2>$null
if ($currentBranch -eq $mainBranch) {
    Write-Pass "Currently on $mainBranch branch"
} else {
    Write-Fail "Should be on $mainBranch branch (currently on: $currentBranch)"
    Write-Hint "Switch to $mainBranch with: git switch $mainBranch"
}

# ============================================================================
# Check that merge is not in progress
# ============================================================================
if (Test-Path "$challengeRoot/.git/MERGE_HEAD") {
    Write-Fail "Merge is still in progress (conflicts not resolved)"
    Write-Hint "Resolve conflicts in config.json, then: git add config.json && git commit"
    exit 1
} else {
    Write-Pass "No merge in progress (conflicts resolved)"
}

# ============================================================================
# Check if config.json exists
# ============================================================================
if (-not (Test-Path "$challengeRoot\config.json")) {
    Write-Fail "File 'config.json' not found"
    Write-Hint "The config.json file should exist"
    exit 1
}

# ============================================================================
# Verify config.json is valid JSON
# ============================================================================
try {
    $configContent = Get-Content "$challengeRoot\config.json" -Raw
    $config = $configContent | ConvertFrom-Json -ErrorAction Stop
    Write-Pass "File 'config.json' is valid JSON"
} catch {
    Write-Fail "File 'config.json' is not valid JSON"
    Write-Hint "Make sure you removed all conflict markers (<<<<<<<, =======, >>>>>>>)"
    Write-Hint "Check for missing commas or brackets"
    Pop-Location
    exit 1
}

# ============================================================================
# Check for conflict markers
# ============================================================================
if ($configContent -match '<<<<<<<|=======|>>>>>>>') {
    Write-Fail "Conflict markers still present in config.json"
    Write-Hint "Remove all conflict markers (<<<<<<<, =======, >>>>>>>)"
    Pop-Location
    exit 1
} else {
    Write-Pass "No conflict markers in config.json"
}

# ============================================================================
# Verify both settings are present (timeout and debug)
# ============================================================================
if ($config.app.timeout -eq 5000) {
    Write-Pass "Timeout setting preserved (5000)"
} else {
    Write-Fail "Timeout setting missing or incorrect"
    Write-Hint "Keep the timeout: 5000 setting from add-timeout branch"
}

if ($config.app.debug -eq $true) {
    Write-Pass "Debug setting preserved (true)"
} else {
    Write-Fail "Debug setting missing or incorrect"
    Write-Hint "Keep the debug: true setting from add-debug branch"
}

# ============================================================================
# Verify both branches were merged
# ============================================================================
git merge-base --is-ancestor add-timeout main
$addTimeoutMerged = $LASTEXITCODE -eq 0

git merge-base --is-ancestor add-debug main
$addDebugMerged = $LASTEXITCODE -eq 0

if ($addTimeoutMerged) {
    Write-Pass "add-timeout branch has been merged"
} else {
    # Check if it was a fast-forward merge (commits exist but no merge commit)
    $timeoutCommit = git log --oneline --grep="Add timeout configuration" 2>$null
    if ($timeoutCommit) {
        Write-Pass "add-timeout branch changes are in main"
    } else {
        Write-Fail "add-timeout branch not merged"
        Write-Hint "Merge with: git merge add-timeout"
    }
}

if ($addDebugMerged) {
    Write-Pass "add-debug branch has been merged"
} else {
    Write-Fail "add-debug branch not merged"
    Write-Hint "Merge with: git merge add-debug"
}

# ============================================================================
# Check commit count (should have both merges)
# ============================================================================
$totalCommits = [int](git rev-list --count HEAD 2>$null)
if ($totalCommits -ge 5) {
    Write-Pass "Repository has $totalCommits commits (all merges complete)"
} else {
    Write-Info "Repository has $totalCommits commits"
    Write-Hint "Make sure both branches are merged"
}

Pop-Location

# ============================================================================
# Final summary
# ============================================================================
Write-Host ""
if ($script:allChecksPassed) {
    Write-Host "=========================================" -ForegroundColor Green
    Write-Host "   CONGRATULATIONS! CHALLENGE PASSED!" -ForegroundColor Green
    Write-Host "=========================================" -ForegroundColor Green
    Write-Host "`nYou've successfully:" -ForegroundColor Cyan
    Write-Host "  ✓ Discovered changes using git diff" -ForegroundColor White
    Write-Host "  ✓ Merged the first branch" -ForegroundColor White
    Write-Host "  ✓ Encountered a merge conflict" -ForegroundColor White
    Write-Host "  ✓ Resolved the conflict by keeping both changes" -ForegroundColor White
    Write-Host "  ✓ Completed the merge" -ForegroundColor White
    Write-Host "`nYou're now ready to handle merge conflicts in real projects!" -ForegroundColor Green
    Write-Host ""
    exit 0
} else {
    Write-Host "[SUMMARY] Some checks failed. Review the hints above." -ForegroundColor Red
    Write-Host ""
    Write-Host "Quick guide:" -ForegroundColor Cyan
    Write-Host "  1. Make sure you're on $mainBranch : git switch $mainBranch" -ForegroundColor White
    Write-Host "  2. Merge first branch: git merge add-timeout" -ForegroundColor White
    Write-Host "  3. Merge second branch: git merge add-debug" -ForegroundColor White
    Write-Host "  4. Resolve conflict: edit config.json, remove markers, keep both settings" -ForegroundColor White
    Write-Host "  5. Stage resolved file: git add config.json" -ForegroundColor White
    Write-Host "  6. Complete merge: git commit" -ForegroundColor White
    Write-Host "  7. Run this verify script again" -ForegroundColor White
    Write-Host ""
    exit 1
}