import asyncio
import json
from pathlib import Path
from typing import Dict, List, Optional
from datetime import datetime
from collections import deque

from fastapi import FastAPI, HTTPException, Request
from fastapi.staticfiles import StaticFiles
from fastapi.responses import HTMLResponse
from pydantic import BaseModel
import uvicorn
import sys

app = FastAPI(title="Pipeline Dashboard")

BASE_DIR = Path(__file__).parent
OUTPUT_DIR = BASE_DIR / "output"
DB_PATH = BASE_DIR / "db_requirements.json"
PROMPTS_DIR = BASE_DIR / "prompts"

# In-memory storage for active runs
class ActiveRun:
    def __init__(self):
        self.process: Optional[asyncio.subprocess.Process] = None
        self.logs: deque = deque(maxlen=200)  # Keep last 200 lines
        self.status: str = "starting"
        self.start_time: str = datetime.now().isoformat()

active_runs: Dict[int, ActiveRun] = {}

class RunRequest(BaseModel):
    skip_research: bool = False
    research_only: bool = False
    platforms: str = "xhs,youtube,bili,x"
    use_claude_sdk: bool = False
    restart_mode: str = "smart"

class MemoRequest(BaseModel):
    memo: str

class PromptRequest(BaseModel):
    content: str

@app.get("/api/requirements")
def get_requirements():
    if not DB_PATH.exists():
        raise HTTPException(status_code=404, detail="db_requirements.json not found")
        
    with open(DB_PATH, "r", encoding="utf-8") as f:
        reqs = json.load(f)
        
    results = []
    for i, req in enumerate(reqs):
        idx_str = f"{(i+1):03d}"
        dir_path = OUTPUT_DIR / idx_str
        
        has_strategy = (dir_path / "strategy.json").exists()
        has_blueprint = (dir_path / "blueprint.json").exists()
        has_caps = (dir_path / "capabilities_extracted.json").exists()
        
        raw_cases_count = 0
        raw_cases_dir = dir_path / "raw_cases"
        if raw_cases_dir.exists():
            raw_cases_count = len(list(raw_cases_dir.glob("case_*.json")))
            
        status = "completed" if has_strategy else ("partial" if raw_cases_count > 0 else "pending")
        if i in active_runs and active_runs[i].status == "running":
            status = "running"
            
        memo_content = ""
        memo_path = dir_path / "memo.txt"
        if memo_path.exists():
            with open(memo_path, "r", encoding="utf-8") as fm:
                memo_content = fm.read().strip()

        results.append({
            "index": i,
            "id": idx_str,
            "requirement": req,
            "status": status,
            "has_strategy": has_strategy,
            "has_blueprint": has_blueprint,
            "has_caps": has_caps,
            "raw_cases_count": raw_cases_count,
            "memo": memo_content
        })
        
    return results

@app.get("/api/requirements/{index}/data")
def get_requirement_data(index: int):
    idx_str = f"{(index+1):03d}"
    dir_path = OUTPUT_DIR / idx_str
    
    def safe_load_json(p: Path):
        if not p.exists():
            return None
        try:
            with open(p, "r", encoding="utf-8") as f:
                return json.load(f)
        except Exception:
            return {"error": "Failed to parse JSON"}

    data = {
        "strategy": safe_load_json(dir_path / "strategy.json"),
        "blueprint": safe_load_json(dir_path / "blueprint.json"),
        "capabilities": safe_load_json(dir_path / "capabilities_extracted.json"),
        "raw_cases": {}
    }
    
    raw_cases_dir = dir_path / "raw_cases"
    if raw_cases_dir.exists():
        for f in raw_cases_dir.glob("case_*.json"):
            data["raw_cases"][f.stem] = safe_load_json(f)
            
    return data

@app.get("/api/requirements/{index}/memo")
def get_memo(index: int):
    idx_str = f"{(index+1):03d}"
    memo_path = OUTPUT_DIR / idx_str / "memo.txt"
    if memo_path.exists():
        with open(memo_path, "r", encoding="utf-8") as f:
            return {"memo": f.read()}
    return {"memo": ""}

@app.post("/api/requirements/{index}/memo")
def save_memo(index: int, req: MemoRequest):
    idx_str = f"{(index+1):03d}"
    dir_path = OUTPUT_DIR / idx_str
    dir_path.mkdir(parents=True, exist_ok=True)
    memo_path = dir_path / "memo.txt"
    with open(memo_path, "w", encoding="utf-8") as f:
        f.write(req.memo)
    return {"status": "ok"}

@app.get("/api/prompts")
def list_prompts():
    if not PROMPTS_DIR.exists():
        return []
    return [f.name for f in PROMPTS_DIR.glob("*.prompt")]

@app.get("/api/prompts/{name}")
def get_prompt(name: str):
    if "/" in name or "\\" in name:
        raise HTTPException(status_code=400, detail="Invalid prompt name")
    prompt_path = PROMPTS_DIR / name
    if not prompt_path.exists() or not prompt_path.is_file():
        raise HTTPException(status_code=404, detail="Prompt not found")
    with open(prompt_path, "r", encoding="utf-8") as f:
        return {"content": f.read()}

@app.post("/api/prompts/{name}")
def save_prompt(name: str, req: PromptRequest):
    if "/" in name or "\\" in name:
        raise HTTPException(status_code=400, detail="Invalid prompt name")
    prompt_path = PROMPTS_DIR / name
    if not prompt_path.exists() or not prompt_path.is_file():
        raise HTTPException(status_code=404, detail="Prompt not found")
    with open(prompt_path, "w", encoding="utf-8") as f:
        f.write(req.content)
    return {"status": "ok"}

async def run_pipeline_task(index: int, run_req: RunRequest):
    run_state = active_runs[index]
    run_state.status = "running"
    
    dir_path = OUTPUT_DIR / f"{(index+1):03d}"
    
    mode = run_req.restart_mode
    
    if mode in ['phase1_platforms', 'phase2_capabilities', 'phase2_blueprint', 'phase2_all', 'phase3']:
        if (dir_path / "strategy.json").exists(): (dir_path / "strategy.json").unlink()
        
    if mode in ['phase1_platforms', 'phase2_all', 'phase2_blueprint']:
        if (dir_path / "blueprint.json").exists(): (dir_path / "blueprint.json").unlink()
        
    if mode in ['phase1_platforms', 'phase2_all', 'phase2_capabilities']:
        if (dir_path / "capabilities_extracted.json").exists(): (dir_path / "capabilities_extracted.json").unlink()
        
    if mode == 'phase1_platforms':
        raw_cases_dir = dir_path / "raw_cases"
        if raw_cases_dir.exists() and run_req.platforms:
            plats = [p.strip() for p in run_req.platforms.split(",") if p.strip()]
            for p in plats:
                f = raw_cases_dir / f"case_{p}.json"
                if f.exists():
                    f.unlink()
        run_req.skip_research = False
    elif mode in ['phase2_capabilities', 'phase2_blueprint', 'phase2_all', 'phase3']:
        run_req.skip_research = True
    
    # build command
    script_path = BASE_DIR / "run_pipeline.py"
    cmd = [sys.executable, str(script_path), "--index", str(index)]
    if run_req.skip_research:
        cmd.append("--skip-research")
    if run_req.research_only:
        cmd.append("--research-only")
    if run_req.platforms:
        cmd.extend(["--platforms", run_req.platforms])
    if run_req.use_claude_sdk:
        cmd.append("--use-claude-sdk")
        
    run_state.logs.append(f"Starting command: {' '.join(cmd)}\n")
    
    import threading
    import subprocess
    import os
    
    def run_process():
        try:
            process = subprocess.Popen(
                cmd,
                stdout=subprocess.PIPE,
                stderr=subprocess.STDOUT,
                text=True,
                encoding="utf-8",
                bufsize=1,
                cwd=str(BASE_DIR),
                env=dict(os.environ, PYTHONIOENCODING="utf-8")
            )
            run_state.process = process
            
            for line in iter(process.stdout.readline, ''):
                if line:
                    run_state.logs.append(line)
            
            process.stdout.close()
            return_code = process.wait()
            
            run_state.logs.append(f"\nProcess exited with code {return_code}")
            run_state.status = "completed" if return_code == 0 else "failed"
        except Exception as e:
            run_state.logs.append(f"\nException occurred: {repr(e)}")
            run_state.status = "failed"
            
    thread = threading.Thread(target=run_process)
    thread.start()

@app.post("/api/pipeline/run/{index}")
async def trigger_pipeline(index: int, req: RunRequest):
    if index in active_runs and active_runs[index].status == "running":
        raise HTTPException(status_code=400, detail="Pipeline already running for this index")
        
    active_runs[index] = ActiveRun()
    asyncio.create_task(run_pipeline_task(index, req))
    return {"message": "Pipeline started", "index": index}

@app.get("/api/pipeline/status")
def get_all_status():
    res = {}
    for idx, run in active_runs.items():
        res[idx] = {
            "status": run.status,
            "start_time": run.start_time,
            "logs": list(run.logs)
        }
    return res

# Mount UI static files
ui_dir = BASE_DIR / "ui"
ui_dir.mkdir(exist_ok=True)
app.mount("/static", StaticFiles(directory=str(ui_dir)), name="static")

@app.get("/")
def serve_ui():
    index_html = ui_dir / "index.html"
    if not index_html.exists():
        return HTMLResponse("UI not found. Please create ui/index.html", status_code=404)
    with open(index_html, "r", encoding="utf-8") as f:
        return HTMLResponse(f.read())

if __name__ == "__main__":
    print("Starting Pipeline Dashboard server on http://127.0.0.1:8080")
    uvicorn.run("server:app", host="0.0.0.0", port=8080, reload=False)