#!/usr/bin/env bash
#
# Create a draft documentation PR by auto-applying batched suggestions.
#
# Usage:
#   script/docs-suggest-publish [--dry-run] [--model MODEL]
#
# This script:
# 1. Reads pending suggestions from the docs/suggestions-pending branch
# 2. Uses Droid to apply all suggestions directly to docs files
# 3. Runs docs formatting
# 4. Creates a draft PR for human review/merge
# 5. Optionally resets the suggestions branch after successful PR creation
#
# Options:
#   --dry-run       Show what would be done without creating PR
#   --keep-queue    Don't reset the suggestions branch after PR creation
#   --model MODEL   Override Droid model used for auto-apply
#   --verbose       Show detailed progress
#
# Run this as part of the preview release workflow.

set -euo pipefail

DRY_RUN=false
KEEP_QUEUE=false
VERBOSE=false
MODEL="${DROID_MODEL:-claude-sonnet-4-5-20250929}"

SUGGESTIONS_BRANCH="docs/suggestions-pending"

# Colors
RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[0;33m'
BLUE='\033[0;34m'
NC='\033[0m'

log() {
    if [[ "$VERBOSE" == "true" ]]; then
        echo -e "${BLUE}[docs-publish]${NC} $*" >&2
    fi
}

error() {
    echo -e "${RED}Error:${NC} $*" >&2
    exit 1
}

# Parse arguments
while [[ $# -gt 0 ]]; do
    case $1 in
        --dry-run)
            DRY_RUN=true
            shift
            ;;
        --keep-queue)
            KEEP_QUEUE=true
            shift
            ;;
        --verbose)
            VERBOSE=true
            shift
            ;;
        --model)
            MODEL="$2"
            shift 2
            ;;
        -h|--help)
            head -26 "$0" | tail -24
            exit 0
            ;;
        *)
            error "Unknown option: $1"
            ;;
    esac
done

# Get repo root
REPO_ROOT="$(cd "$(dirname "$0")/.." && pwd)"
cd "$REPO_ROOT"

# Check if suggestions branch exists
log "Checking for suggestions branch..."
if ! git ls-remote --exit-code --heads origin "$SUGGESTIONS_BRANCH" > /dev/null 2>&1; then
    echo "No pending suggestions found (branch $SUGGESTIONS_BRANCH doesn't exist)."
    echo "Suggestions are queued automatically when PRs are merged to main."
    exit 0
fi

# Fetch the suggestions branch
log "Fetching suggestions branch..."
git fetch origin "$SUGGESTIONS_BRANCH"

# Check for manifest
if ! git show "origin/$SUGGESTIONS_BRANCH:manifest.json" > /dev/null 2>&1; then
    echo "No manifest found on suggestions branch."
    exit 0
fi

# Read manifest
MANIFEST=$(git show "origin/$SUGGESTIONS_BRANCH:manifest.json")
SUGGESTION_COUNT=$(echo "$MANIFEST" | jq '.suggestions | length')

if [[ "$SUGGESTION_COUNT" -eq 0 ]]; then
    echo "No pending suggestions in queue."
    exit 0
fi

echo "Found $SUGGESTION_COUNT pending suggestion(s):"
echo ""
echo "$MANIFEST" | jq -r '.suggestions[] | "  PR #\(.pr): \(.title)"'
echo ""

if [[ "$DRY_RUN" == "true" ]]; then
    echo -e "${YELLOW}=== DRY RUN ===${NC}"
    echo ""
    echo "Would auto-apply suggestions to docs via Droid and create a draft PR."
    echo "Model: $MODEL"
    echo ""
    
    # Show each suggestion file
    for file in $(echo "$MANIFEST" | jq -r '.suggestions[].file'); do
        echo "--- $file ---"
        git show "origin/$SUGGESTIONS_BRANCH:$file" 2>/dev/null || echo "(file not found)"
        echo ""
    done
    
    echo -e "${YELLOW}=== END DRY RUN ===${NC}"
    echo ""
    echo "Run without --dry-run to create the PR."
    exit 0
fi

# Ensure clean working state
if [[ -n "$(git status --porcelain)" ]]; then
    error "Working directory has uncommitted changes. Please commit or stash first."
fi

for command in git gh jq droid; do
    if ! command -v "$command" > /dev/null 2>&1; then
        error "Required command not found: $command"
    fi
done

# Remember current branch
ORIGINAL_BRANCH=$(git branch --show-current)
log "Current branch: $ORIGINAL_BRANCH"

# Create new branch for docs PR from latest main
git fetch origin main
DOCS_BRANCH="docs/preview-auto-$(date +%Y-%m-%d-%H%M%S)"
log "Creating docs branch: $DOCS_BRANCH"

git checkout -b "$DOCS_BRANCH" origin/main

TMPDIR=$(mktemp -d)
trap 'rm -rf "$TMPDIR"' EXIT

SUGGESTIONS_FILE="$TMPDIR/suggestions.md"
APPLY_PROMPT_FILE="$TMPDIR/apply-prompt.md"
APPLY_SUMMARY_FILE="$TMPDIR/apply-summary.md"

# Combine queued suggestion files into one input
for file in $(echo "$MANIFEST" | jq -r '.suggestions[].file'); do
    {
        echo "## Source: $file"
        echo ""
        git show "origin/$SUGGESTIONS_BRANCH:$file" 2>/dev/null || error "Suggestion file missing: $file"
        echo ""
        echo "---"
        echo ""
    } >> "$SUGGESTIONS_FILE"
done

# Build auto-apply prompt
cat > "$APPLY_PROMPT_FILE" << 'EOF'
# Documentation Auto-Apply Request (Preview Release)

Apply all queued documentation suggestions below directly to docs files in this repository.

Before making edits, read and follow these rule files:
- `.rules`
- `docs/.rules`

## Required behavior

1. Apply concrete documentation edits (not suggestion text) to the appropriate files.
2. Edit only docs content files under `docs/src/` unless a suggestion explicitly requires another docs path.
3. For every docs file you modify, run a full-file brand voice pass (entire file, not only edited sections).
4. Enforce the brand rubric exactly; final file content must score 4+ on every criterion:
   - Technical Grounding
   - Natural Syntax
   - Quiet Confidence
   - Developer Respect
   - Information Priority
   - Specificity
   - Voice Consistency
   - Earned Claims
5. Keep SEO/frontmatter/linking requirements from the suggestions where applicable.
6. Keep preview callout semantics correct:
   - Additive features: `> **Preview:** ...`
   - Behavior modifications: `> **Changed in Preview (vX.XXX).** ...`
7. If a suggestion is too ambiguous to apply safely, skip it and explain why in the summary.

## Output format (after making edits)

Return markdown with:

- `## Applied Suggestions`
- `## Skipped Suggestions`
- `## Files Updated`
- `## Brand Voice Verification` (one line per updated file confirming full-file pass)

Do not include a patch in the response; apply edits directly to files.

## Queued Suggestions

EOF

cat "$SUGGESTIONS_FILE" >> "$APPLY_PROMPT_FILE"

log "Running Droid auto-apply with model: $MODEL"
droid exec -m "$MODEL" -f "$APPLY_PROMPT_FILE" > "$APPLY_SUMMARY_FILE"

if [[ -n "$(git status --porcelain | grep -vE '^.. docs/' || true)" ]]; then
    error "Auto-apply modified non-doc files. Revert and re-run."
fi

if [[ -z "$(git status --porcelain docs/ | grep '^.. docs/src/' || true)" ]]; then
    error "Auto-apply produced no docs/src changes."
fi

log "Running docs formatter"
./script/prettier

if [[ -z "$(git status --porcelain docs/ | grep '^.. docs/src/' || true)" ]]; then
    error "No docs/src changes remain after formatting; aborting PR creation."
fi

# Build PR body from suggestions
PR_BODY_FILE="$TMPDIR/pr-body.md"
cat > "$PR_BODY_FILE" << 'EOF'
# Documentation Updates for Preview Release

This draft PR auto-applies queued documentation suggestions collected from
recently merged PRs.

## How to Use This PR

1. Review the applied changes file-by-file.
2. Verify brand voice on each touched file as a full-file pass.
3. Ensure docs use the correct callout type:
   - Additive features: Preview callout
   - Behavior modifications: Changed in Preview callout
4. Merge when ready.

## Auto-Apply Summary

EOF

cat "$APPLY_SUMMARY_FILE" >> "$PR_BODY_FILE"

cat >> "$PR_BODY_FILE" << 'EOF'

## Preview Callouts

Use the Preview callout for new/additive features:

```markdown
> **Preview:** This feature is available in Zed Preview. It will be included in the next Stable release.
```

Use this callout for behavior modifications to existing functionality:

```markdown
> **Changed in Preview (v0.XXX).** See [release notes](/releases#0.XXX).
```

---

## Pending Suggestions

EOF

# Append each suggestion to PR body
for file in $(echo "$MANIFEST" | jq -r '.suggestions[].file'); do
    log "Adding $file to PR body..."
    echo "" >> "$PR_BODY_FILE"
    git show "origin/$SUGGESTIONS_BRANCH:$file" >> "$PR_BODY_FILE" 2>/dev/null || true
    echo "" >> "$PR_BODY_FILE"
    echo "---" >> "$PR_BODY_FILE"
done

# Add tracking info
cat >> "$PR_BODY_FILE" << EOF

## PRs Included

EOF

echo "$MANIFEST" | jq -r '.suggestions[] | "- [PR #\(.pr)](\(.file)): \(.title)"' >> "$PR_BODY_FILE"

cat >> "$PR_BODY_FILE" << 'EOF'

Release Notes:

- N/A
EOF

git add docs/
git commit -m "docs: auto-apply preview release suggestions

Auto-applied queued documentation suggestions from:
$(echo "$MANIFEST" | jq -r '.suggestions[] | "- PR #\(.pr)"')

Generated with script/docs-suggest-publish for human review in draft PR."

# Push and create PR
log "Pushing branch..."
git push -u origin "$DOCS_BRANCH"

log "Creating PR..."
PR_URL=$(gh pr create \
    --draft \
    --title "docs: auto-apply preview release suggestions" \
    --body-file "$PR_BODY_FILE" \
    --label "documentation")

echo ""
echo -e "${GREEN}PR created:${NC} $PR_URL"

# Reset suggestions branch if not keeping
if [[ "$KEEP_QUEUE" != "true" ]]; then
    echo ""
    echo "Resetting suggestions queue..."
    
    git checkout --orphan "${SUGGESTIONS_BRANCH}-reset"
    git rm -rf . > /dev/null 2>&1 || true
    
    cat > README.md << 'EOF'
# Documentation Suggestions Queue

This branch contains batched documentation suggestions for the next Preview release.

Each file represents suggestions from a merged PR. At preview branch cut time,
run `script/docs-suggest-publish` to create a documentation PR from these suggestions.

## Structure

- `suggestions/PR-XXXXX.md` - Suggestions for PR #XXXXX
- `manifest.json` - Index of all pending suggestions

## Workflow

1. PRs merged to main trigger documentation analysis
2. Suggestions are committed here as individual files
3. At preview release, suggestions are collected into a docs PR
4. After docs PR is created, this branch is reset
EOF
    
    mkdir -p suggestions
    echo '{"suggestions":[]}' > manifest.json
    git add README.md suggestions manifest.json
    git commit -m "Reset documentation suggestions queue

Previous suggestions published in: $PR_URL"
    
    git push -f origin "${SUGGESTIONS_BRANCH}-reset:$SUGGESTIONS_BRANCH"
    git checkout "$ORIGINAL_BRANCH"
    git branch -D "${SUGGESTIONS_BRANCH}-reset"
    
    echo "Suggestions queue reset."
else
    git checkout "$ORIGINAL_BRANCH"
    echo ""
    echo "Suggestions queue kept (--keep-queue). Remember to reset manually after PR is merged."
fi

# Cleanup


echo ""
echo -e "${GREEN}Done!${NC}"
echo ""
echo "Next steps:"
echo "1. Review the draft PR and verify all auto-applied docs changes"
echo "2. Confirm full-file brand voice pass for each touched docs file"
echo "3. Mark ready for review and merge"