#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <assert.h>
#include "miniasm.h"
#include "kvec.h"

asg_t *ma_sg_gen(const ma_opt_t *opt, const sdict_t *d, const ma_sub_t *sub, size_t n_hits, const ma_hit_t *hit)
{
	size_t i;
	asg_t *g;
	g = asg_init();
	for (i = 0; i < d->n_seq; ++i) {
		if (sub) asg_seq_set(g, i, sub[i].e - sub[i].s, (sub[i].del || d->seq[i].del));
		else asg_seq_set(g, i, d->seq[i].len, d->seq[i].del);
	}
	for (i = 0; i < n_hits; ++i) {
		int r;
		asg_arc_t t, *p;
		const ma_hit_t *h = &hit[i];
		uint32_t qn = h->qns>>32;
		int ql = sub? sub[qn].e - sub[qn].s : d->seq[qn].len;
		int tl = sub? sub[h->tn].e - sub[h->tn].s : d->seq[h->tn].len;
		r = ma_hit2arc(h, ql, tl, opt->max_hang, opt->int_frac, opt->min_ovlp, &t);
		if (r >= 0) {
			if (qn == h->tn) { // self match
				if ((uint32_t)h->qns == h->ts && h->qe == h->te && h->rev) // PacBio-specific artifact (TODO: is this right when we skip target containment above?)
					g->seq[qn].del = 1;
				continue;
			}
			p = asg_arc_pushp(g);
			*p = t;
		} else if (r == MA_HT_QCONT) g->seq[qn].del = 1;
	}
	asg_cleanup(g);
	fprintf(stderr, "[M::%s] read %d arcs\n", __func__, g->n_arc);
	return g;
}

void ma_sg_print(const asg_t *g, const sdict_t *d, const ma_sub_t *sub, FILE *fp)
{
	uint32_t i;
	for (i = 0; i < g->n_arc; ++i) {
		const asg_arc_t *p = &g->arc[i];
		if (sub) {
			const ma_sub_t *sq = &sub[p->ul>>33], *st = &sub[p->v>>1];
			fprintf(fp, "L\t%s:%d-%d\t%c\t%s:%d-%d\t%c\t%d:\tL1:i:%d\n", d->seq[p->ul>>33].name, sq->s + 1, sq->e, "+-"[p->ul>>32&1],
					d->seq[p->v>>1].name, st->s + 1, st->e, "+-"[p->v&1], p->ol, (uint32_t)p->ul);
		} else {
			fprintf(fp, "L\t%s\t%c\t%s\t%c\t%d:\tL1:i:%d\n", d->seq[p->ul>>33].name, "+-"[p->ul>>32&1],
					d->seq[p->v>>1].name, "+-"[p->v&1], p->ol, (uint32_t)p->ul);
		}
	}
}

/*********************
 * Unitig generation *
 *********************/

#include "kdq.h"
KDQ_INIT(uint64_t)

void ma_ug_destroy(ma_ug_t *ug)
{
	uint32_t i;
	if (ug == 0) return;
	for (i = 0; i < ug->u.n; ++i) {
		free(ug->u.a[i].a);
		free(ug->u.a[i].s);
	}
	free(ug->u.a);
	asg_destroy(ug->g);
	free(ug);
}

void ma_ug_print(const ma_ug_t *ug, const sdict_t *d, const ma_sub_t *sub, FILE *fp)
{
	uint32_t i, j, l;
	char name[32];
	for (i = 0; i < ug->u.n; ++i) { // the Segment lines in GFA
		ma_utg_t *p = &ug->u.a[i];
		sprintf(name, "utg%.6d%c", i + 1, "lc"[p->circ]);
		fprintf(fp, "S\t%s\t%s\tLN:i:%d\n", name, p->s? p->s : "*", p->len);
		for (j = l = 0; j < p->n; l += (uint32_t)p->a[j++]) {
			uint32_t x = p->a[j]>>33;
			if (sub) fprintf(fp, "a\t%s\t%d\t%s:%d-%d\t%c\t%d\n", name, l, d->seq[x].name, sub[x].s + 1, sub[x].e, "+-"[p->a[j]>>32&1], (uint32_t)p->a[j]);
			else fprintf(fp, "a\t%s\t%d\t%s\t%c\t%d\n", name, l, d->seq[x].name, "+-"[p->a[j]>>32&1], (uint32_t)p->a[j]);
		}
	}
	for (i = 0; i < ug->g->n_arc; ++i) { // the Link lines in GFA
		uint32_t u = ug->g->arc[i].ul>>32, v = ug->g->arc[i].v;
		fprintf(fp, "L\tutg%.6d%c\t%c\tutg%.6d%c\t%c\t%dM\tSD:i:%d\n", (u>>1)+1, "lc"[ug->u.a[u>>1].circ], "+-"[u&1],
				(v>>1)+1, "lc"[ug->u.a[v>>1].circ], "+-"[v&1], ug->g->arc[i].ol, asg_arc_len(ug->g->arc[i]));
	}
	for (i = 0; i < ug->u.n; ++i) { // summary of unitigs
		uint32_t cnt[2];
		ma_utg_t *u = &ug->u.a[i];
		if (u->start == UINT32_MAX) {
			fprintf(fp, "x\tutg%.6dc\t%d\t%d\n", i + 1, u->len, u->n);
		} else {
			for (j = 0; j < 2; ++j) cnt[j] = asg_arc_n(ug->g, i<<1|j);
			if (sub)
				fprintf(fp, "x\tutg%.6dl\t%d\t%d\t%d\t%d\t%s:%d-%d\t%c\t%s:%d-%d\t%c\n", i + 1, u->len, u->n, cnt[1], cnt[0],
						d->seq[u->start>>1].name, sub[u->start>>1].s + 1, sub[u->start>>1].e, "+-"[u->start&1],
						d->seq[u->end>>1].name, sub[u->end>>1].s + 1, sub[u->end>>1].e, "+-"[u->end&1]);
			else
				fprintf(fp, "x\tutg%.6dl\t%d\t%d\t%d\t%d\t%s\t%c\t%s\t%c\n", i + 1, u->len, u->n, cnt[1], cnt[0],
						d->seq[u->start>>1].name, "+-"[u->start&1], d->seq[u->end>>1].name, "+-"[u->end&1]);
		}
	}
}

#define arc_cnt(g, v) ((uint32_t)(g)->idx[(v)])
#define arc_first(g, v) ((g)->arc[(g)->idx[(v)]>>32])

ma_ug_t *ma_ug_gen(asg_t *g)
{
	int32_t *mark;
	uint32_t i, v, n_vtx = g->n_seq * 2;
	kdq_t(uint64_t) *q;
	ma_ug_t *ug;

	ug = (ma_ug_t*)calloc(1, sizeof(ma_ug_t));
	ug->g = asg_init();
	mark = (int32_t*)calloc(n_vtx, 4);

	q = kdq_init(uint64_t);
	for (v = 0; v < n_vtx; ++v) {
		uint32_t w, x, l, start, end, len;
		ma_utg_t *p;
		if (g->seq[v>>1].del || arc_cnt(g, v) == 0 || mark[v]) continue;
		mark[v] = 1;
		q->count = 0, start = v, end = v^1, len = 0;
		// forward
		w = v;
		while (1) {
			if (arc_cnt(g, w) != 1) break;
			x = arc_first(g, w).v; // w->x
			if (arc_cnt(g, x^1) != 1) break;
			mark[x] = mark[w^1] = 1;
			l = asg_arc_len(arc_first(g, w));
			kdq_push(uint64_t, q, (uint64_t)w<<32 | l);
			end = x^1, len += l;
			w = x;
			if (x == v) break;
		}
		if (start != (end^1) || kdq_size(q) == 0) { // linear unitig
			l = g->seq[end>>1].len;
			kdq_push(uint64_t, q, (uint64_t)(end^1)<<32 | l);
			len += l;
		} else { // circular unitig
			start = end = UINT32_MAX;
			goto add_unitig; // then it is not necessary to do the backward
		}
		// backward
		x = v;
		while (1) { // similar to forward but not the same
			if (arc_cnt(g, x^1) != 1) break;
			w = arc_first(g, x^1).v ^ 1; // w->x
			if (arc_cnt(g, w) != 1) break;
			mark[x] = mark[w^1] = 1;
			l = asg_arc_len(arc_first(g, w));
			kdq_unshift(uint64_t, q, (uint64_t)w<<32 | l);
			start = w, len += l;
			x = w;
		}
add_unitig:
		if (start != UINT32_MAX) mark[start] = mark[end] = 1;
		kv_pushp(ma_utg_t, ug->u, &p);
		p->s = 0, p->start = start, p->end = end, p->len = len, p->n = kdq_size(q), p->circ = (start == UINT32_MAX);
		p->m = p->n;
		kv_roundup32(p->m);
		p->a = (uint64_t*)malloc(8 * p->m);
		for (i = 0; i < kdq_size(q); ++i)
			p->a[i] = kdq_at(q, i);
	}
	kdq_destroy(uint64_t, q);

	// add arcs between unitigs; reusing mark for a different purpose
	for (v = 0; v < n_vtx; ++v) mark[v] = -1;
	for (i = 0; i < ug->u.n; ++i) {
		if (ug->u.a[i].circ) continue;
		mark[ug->u.a[i].start] = i<<1 | 0;
		mark[ug->u.a[i].end] = i<<1 | 1;
	}
	for (i = 0; i < g->n_arc; ++i) {
		asg_arc_t *p = &g->arc[i];
		if (p->del) continue;
		if (mark[p->ul>>32^1] >= 0 && mark[p->v] >= 0) {
			asg_arc_t *q;
			uint32_t u = mark[p->ul>>32^1]^1;
			int l = ug->u.a[u>>1].len - p->ol;
			if (l < 0) l = 1;
			q = asg_arc_pushp(ug->g);
			q->ol = p->ol, q->del = 0;
			q->ul = (uint64_t)u<<32 | l;
			q->v = mark[p->v];
		}
	}
	for (i = 0; i < ug->u.n; ++i)
		asg_seq_set(ug->g, i, ug->u.a[i].len, 0);
	asg_cleanup(ug->g);
	free(mark);
	return ug;
}

/*******************
 * Unitig sequence *
 *******************/

#include <zlib.h>
#include "kseq.h"
KSEQ_INIT(gzFile, gzread)

typedef struct {
	uint32_t utg:31, ori:1, start, len;
} utg_intv_t;

static char comp_tab[] = { // complement base
	  0,   1,	2,	 3,	  4,   5,	6,	 7,	  8,   9,  10,	11,	 12,  13,  14,	15,
	 16,  17,  18,	19,	 20,  21,  22,	23,	 24,  25,  26,	27,	 28,  29,  30,	31,
	 32,  33,  34,	35,	 36,  37,  38,	39,	 40,  41,  42,	43,	 44,  45,  46,	47,
	 48,  49,  50,	51,	 52,  53,  54,	55,	 56,  57,  58,	59,	 60,  61,  62,	63,
	 64, 'T', 'V', 'G', 'H', 'E', 'F', 'C', 'D', 'I', 'J', 'M', 'L', 'K', 'N', 'O',
	'P', 'Q', 'Y', 'S', 'A', 'A', 'B', 'W', 'X', 'R', 'Z',	91,	 92,  93,  94,	95,
	 64, 't', 'v', 'g', 'h', 'e', 'f', 'c', 'd', 'i', 'j', 'm', 'l', 'k', 'n', 'o',
	'p', 'q', 'y', 's', 'a', 'a', 'b', 'w', 'x', 'r', 'z', 123, 124, 125, 126, 127
};

// generate unitig sequences
int ma_ug_seq(ma_ug_t *g, const sdict_t *d, const ma_sub_t *sub, const char *fn)
{
	gzFile fp;
	kseq_t *ks;
	utg_intv_t *tmp;
	uint32_t i, j;

	fp = fn && strcmp(fn, "-")? gzopen(fn, "r") : gzdopen(fileno(stdin), "r");
	if (fp == 0) return -1;
	ks = kseq_init(fp);

	tmp = (utg_intv_t*)calloc(d->n_seq, sizeof(utg_intv_t));
	for (i = 0; i < g->u.n; ++i) {
		ma_utg_t *u = &g->u.a[i];
		uint32_t l = 0;
		u->s = (char*)calloc(1, u->len + 1);
		memset(u->s, 'N', u->len);
		for (j = 0; j < u->n; ++j) {
			utg_intv_t *t = &tmp[u->a[j]>>33];
			assert(t->len == 0);
			t->utg = i, t->ori = u->a[j]>>32&1;
			t->start = l, t->len = (uint32_t)u->a[j];
			l += t->len;
		}
	}

	while (kseq_read(ks) >= 0) {
		int32_t id;
		utg_intv_t *t;
		ma_utg_t *u;
		id = sd_get(d, ks->name.s);
		if (id < 0 || tmp[id].len == 0) continue;
		t = &tmp[id];
		u = &g->u.a[t->utg];
		if (sub) {
			assert(sub[id].e - sub[id].s <= ks->seq.l);
			memmove(ks->seq.s, ks->seq.s + sub[id].s, sub[id].e - sub[id].s);
			ks->seq.l = sub[id].e - sub[id].s;
		}
		if (!t->ori) { // forward strand
			for (i = 0; i < t->len; ++i)
				u->s[t->start + i] = ks->seq.s[i];
		} else {
			for (i = 0; i < t->len; ++i) {
				int c = (uint8_t)ks->seq.s[ks->seq.l - 1 - i];
				u->s[t->start + i] = c >= 128? 'N' : comp_tab[c];
			}
		}
	}
	free(tmp);

	kseq_destroy(ks);
	gzclose(fp);
	return 0;
}